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1da177e4 LT |
1 | /* |
2 | * g_serial.c -- USB gadget serial driver | |
3 | * | |
4 | * Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com) | |
5 | * | |
6 | * This code is based in part on the Gadget Zero driver, which | |
7 | * is Copyright (C) 2003 by David Brownell, all rights reserved. | |
8 | * | |
9 | * This code also borrows from usbserial.c, which is | |
10 | * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) | |
11 | * Copyright (C) 2000 Peter Berger (pberger@brimson.com) | |
12 | * Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com) | |
13 | * | |
14 | * This software is distributed under the terms of the GNU General | |
15 | * Public License ("GPL") as published by the Free Software Foundation, | |
16 | * either version 2 of that License or (at your option) any later version. | |
1da177e4 LT |
17 | */ |
18 | ||
1da177e4 | 19 | #include <linux/kernel.h> |
1da177e4 | 20 | #include <linux/utsname.h> |
1da177e4 LT |
21 | #include <linux/device.h> |
22 | #include <linux/tty.h> | |
23 | #include <linux/tty_flip.h> | |
1da177e4 | 24 | |
5f848137 | 25 | #include <linux/usb/ch9.h> |
a8c28f23 | 26 | #include <linux/usb/cdc.h> |
9454a57a | 27 | #include <linux/usb/gadget.h> |
1da177e4 LT |
28 | |
29 | #include "gadget_chips.h" | |
30 | ||
31 | ||
1da177e4 LT |
32 | /* Defines */ |
33 | ||
ca094f11 | 34 | #define GS_VERSION_STR "v2.2" |
b9370332 | 35 | #define GS_VERSION_NUM 0x2200 |
1da177e4 LT |
36 | |
37 | #define GS_LONG_NAME "Gadget Serial" | |
38 | #define GS_SHORT_NAME "g_serial" | |
39 | ||
40 | #define GS_MAJOR 127 | |
41 | #define GS_MINOR_START 0 | |
42 | ||
9079e91b DB |
43 | /* REVISIT only one port is supported for now; |
44 | * see gs_{send,recv}_packet() ... no multiplexing, | |
45 | * and no support for multiple ACM devices. | |
46 | */ | |
47 | #define GS_NUM_PORTS 1 | |
1da177e4 LT |
48 | |
49 | #define GS_NUM_CONFIGS 1 | |
50 | #define GS_NO_CONFIG_ID 0 | |
51 | #define GS_BULK_CONFIG_ID 1 | |
52 | #define GS_ACM_CONFIG_ID 2 | |
53 | ||
54 | #define GS_MAX_NUM_INTERFACES 2 | |
55 | #define GS_BULK_INTERFACE_ID 0 | |
56 | #define GS_CONTROL_INTERFACE_ID 0 | |
57 | #define GS_DATA_INTERFACE_ID 1 | |
58 | ||
59 | #define GS_MAX_DESC_LEN 256 | |
60 | ||
61 | #define GS_DEFAULT_READ_Q_SIZE 32 | |
62 | #define GS_DEFAULT_WRITE_Q_SIZE 32 | |
63 | ||
64 | #define GS_DEFAULT_WRITE_BUF_SIZE 8192 | |
65 | #define GS_TMP_BUF_SIZE 8192 | |
66 | ||
67 | #define GS_CLOSE_TIMEOUT 15 | |
68 | ||
69 | #define GS_DEFAULT_USE_ACM 0 | |
70 | ||
9079e91b DB |
71 | /* 9600-8-N-1 ... matches init_termios.c_cflag and defaults |
72 | * expected by "usbser.sys" on MS-Windows. | |
73 | */ | |
1da177e4 LT |
74 | #define GS_DEFAULT_DTE_RATE 9600 |
75 | #define GS_DEFAULT_DATA_BITS 8 | |
76 | #define GS_DEFAULT_PARITY USB_CDC_NO_PARITY | |
77 | #define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS | |
78 | ||
51a0e85c DB |
79 | /* maxpacket and other transfer characteristics vary by speed. */ |
80 | static inline struct usb_endpoint_descriptor * | |
81 | choose_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs, | |
82 | struct usb_endpoint_descriptor *fs) | |
83 | { | |
84 | if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
85 | return hs; | |
86 | return fs; | |
87 | } | |
88 | ||
1da177e4 LT |
89 | |
90 | /* debug settings */ | |
51a0e85c | 91 | #ifdef DEBUG |
1da177e4 | 92 | static int debug = 1; |
51a0e85c DB |
93 | #else |
94 | #define debug 0 | |
95 | #endif | |
1da177e4 LT |
96 | |
97 | #define gs_debug(format, arg...) \ | |
00274921 | 98 | do { if (debug) pr_debug(format, ## arg); } while (0) |
1da177e4 | 99 | #define gs_debug_level(level, format, arg...) \ |
00274921 | 100 | do { if (debug >= level) pr_debug(format, ## arg); } while (0) |
1da177e4 | 101 | |
1da177e4 LT |
102 | |
103 | /* Thanks to NetChip Technologies for donating this product ID. | |
104 | * | |
105 | * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! | |
106 | * Instead: allocate your own, using normal USB-IF procedures. | |
107 | */ | |
108 | #define GS_VENDOR_ID 0x0525 /* NetChip */ | |
109 | #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */ | |
110 | #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */ | |
111 | ||
112 | #define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */ | |
113 | #define GS_NOTIFY_MAXPACKET 8 | |
114 | ||
115 | ||
1da177e4 LT |
116 | /* circular buffer */ |
117 | struct gs_buf { | |
118 | unsigned int buf_size; | |
119 | char *buf_buf; | |
120 | char *buf_get; | |
121 | char *buf_put; | |
122 | }; | |
123 | ||
1da177e4 LT |
124 | /* the port structure holds info for each port, one for each minor number */ |
125 | struct gs_port { | |
51a0e85c | 126 | struct gs_dev *port_dev; /* pointer to device struct */ |
1da177e4 LT |
127 | struct tty_struct *port_tty; /* pointer to tty struct */ |
128 | spinlock_t port_lock; | |
51a0e85c | 129 | int port_num; |
1da177e4 LT |
130 | int port_open_count; |
131 | int port_in_use; /* open/close in progress */ | |
132 | wait_queue_head_t port_write_wait;/* waiting to write */ | |
133 | struct gs_buf *port_write_buf; | |
f371e750 DB |
134 | struct usb_cdc_line_coding port_line_coding; /* 8-N-1 etc */ |
135 | u16 port_handshake_bits; | |
136 | #define RS232_RTS (1 << 1) | |
137 | #define RS232_DTE (1 << 0) | |
1da177e4 LT |
138 | }; |
139 | ||
140 | /* the device structure holds info for the USB device */ | |
141 | struct gs_dev { | |
142 | struct usb_gadget *dev_gadget; /* gadget device pointer */ | |
143 | spinlock_t dev_lock; /* lock for set/reset config */ | |
144 | int dev_config; /* configuration number */ | |
145 | struct usb_ep *dev_notify_ep; /* address of notify endpoint */ | |
146 | struct usb_ep *dev_in_ep; /* address of in endpoint */ | |
147 | struct usb_ep *dev_out_ep; /* address of out endpoint */ | |
093cf723 | 148 | struct usb_endpoint_descriptor /* descriptor of notify ep */ |
1da177e4 LT |
149 | *dev_notify_ep_desc; |
150 | struct usb_endpoint_descriptor /* descriptor of in endpoint */ | |
151 | *dev_in_ep_desc; | |
152 | struct usb_endpoint_descriptor /* descriptor of out endpoint */ | |
153 | *dev_out_ep_desc; | |
154 | struct usb_request *dev_ctrl_req; /* control request */ | |
155 | struct list_head dev_req_list; /* list of write requests */ | |
156 | int dev_sched_port; /* round robin port scheduled */ | |
157 | struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */ | |
158 | }; | |
159 | ||
160 | ||
161 | /* Functions */ | |
162 | ||
9079e91b | 163 | /* tty driver internals */ |
1da177e4 LT |
164 | static int gs_send(struct gs_dev *dev); |
165 | static int gs_send_packet(struct gs_dev *dev, char *packet, | |
166 | unsigned int size); | |
167 | static int gs_recv_packet(struct gs_dev *dev, char *packet, | |
168 | unsigned int size); | |
169 | static void gs_read_complete(struct usb_ep *ep, struct usb_request *req); | |
170 | static void gs_write_complete(struct usb_ep *ep, struct usb_request *req); | |
171 | ||
9079e91b | 172 | /* gadget driver internals */ |
1da177e4 LT |
173 | static int gs_set_config(struct gs_dev *dev, unsigned config); |
174 | static void gs_reset_config(struct gs_dev *dev); | |
51a0e85c | 175 | static int gs_build_config_buf(u8 *buf, struct usb_gadget *g, |
1da177e4 LT |
176 | u8 type, unsigned int index, int is_otg); |
177 | ||
178 | static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len, | |
55016f10 | 179 | gfp_t kmalloc_flags); |
1da177e4 LT |
180 | static void gs_free_req(struct usb_ep *ep, struct usb_request *req); |
181 | ||
55016f10 | 182 | static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags); |
1da177e4 LT |
183 | static void gs_free_ports(struct gs_dev *dev); |
184 | ||
185 | /* circular buffer */ | |
55016f10 | 186 | static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags); |
1da177e4 LT |
187 | static void gs_buf_free(struct gs_buf *gb); |
188 | static void gs_buf_clear(struct gs_buf *gb); | |
189 | static unsigned int gs_buf_data_avail(struct gs_buf *gb); | |
190 | static unsigned int gs_buf_space_avail(struct gs_buf *gb); | |
191 | static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, | |
192 | unsigned int count); | |
193 | static unsigned int gs_buf_get(struct gs_buf *gb, char *buf, | |
194 | unsigned int count); | |
195 | ||
1da177e4 LT |
196 | |
197 | /* Globals */ | |
198 | ||
199 | static struct gs_dev *gs_device; | |
200 | ||
831c70fc | 201 | static struct mutex gs_open_close_lock[GS_NUM_PORTS]; |
1da177e4 | 202 | |
1da177e4 | 203 | |
9079e91b | 204 | /*-------------------------------------------------------------------------*/ |
1da177e4 LT |
205 | |
206 | /* USB descriptors */ | |
207 | ||
208 | #define GS_MANUFACTURER_STR_ID 1 | |
209 | #define GS_PRODUCT_STR_ID 2 | |
210 | #define GS_SERIAL_STR_ID 3 | |
211 | #define GS_BULK_CONFIG_STR_ID 4 | |
212 | #define GS_ACM_CONFIG_STR_ID 5 | |
213 | #define GS_CONTROL_STR_ID 6 | |
214 | #define GS_DATA_STR_ID 7 | |
215 | ||
216 | /* static strings, in UTF-8 */ | |
217 | static char manufacturer[50]; | |
218 | static struct usb_string gs_strings[] = { | |
219 | { GS_MANUFACTURER_STR_ID, manufacturer }, | |
220 | { GS_PRODUCT_STR_ID, GS_LONG_NAME }, | |
1da177e4 LT |
221 | { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" }, |
222 | { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" }, | |
223 | { GS_CONTROL_STR_ID, "Gadget Serial Control" }, | |
224 | { GS_DATA_STR_ID, "Gadget Serial Data" }, | |
225 | { } /* end of list */ | |
226 | }; | |
227 | ||
228 | static struct usb_gadget_strings gs_string_table = { | |
229 | .language = 0x0409, /* en-us */ | |
230 | .strings = gs_strings, | |
231 | }; | |
232 | ||
233 | static struct usb_device_descriptor gs_device_desc = { | |
234 | .bLength = USB_DT_DEVICE_SIZE, | |
235 | .bDescriptorType = USB_DT_DEVICE, | |
236 | .bcdUSB = __constant_cpu_to_le16(0x0200), | |
237 | .bDeviceSubClass = 0, | |
238 | .bDeviceProtocol = 0, | |
239 | .idVendor = __constant_cpu_to_le16(GS_VENDOR_ID), | |
240 | .idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID), | |
241 | .iManufacturer = GS_MANUFACTURER_STR_ID, | |
242 | .iProduct = GS_PRODUCT_STR_ID, | |
1da177e4 LT |
243 | .bNumConfigurations = GS_NUM_CONFIGS, |
244 | }; | |
245 | ||
246 | static struct usb_otg_descriptor gs_otg_descriptor = { | |
247 | .bLength = sizeof(gs_otg_descriptor), | |
248 | .bDescriptorType = USB_DT_OTG, | |
249 | .bmAttributes = USB_OTG_SRP, | |
250 | }; | |
251 | ||
252 | static struct usb_config_descriptor gs_bulk_config_desc = { | |
253 | .bLength = USB_DT_CONFIG_SIZE, | |
254 | .bDescriptorType = USB_DT_CONFIG, | |
255 | /* .wTotalLength computed dynamically */ | |
256 | .bNumInterfaces = 1, | |
257 | .bConfigurationValue = GS_BULK_CONFIG_ID, | |
258 | .iConfiguration = GS_BULK_CONFIG_STR_ID, | |
259 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, | |
260 | .bMaxPower = 1, | |
261 | }; | |
262 | ||
263 | static struct usb_config_descriptor gs_acm_config_desc = { | |
264 | .bLength = USB_DT_CONFIG_SIZE, | |
265 | .bDescriptorType = USB_DT_CONFIG, | |
266 | /* .wTotalLength computed dynamically */ | |
267 | .bNumInterfaces = 2, | |
268 | .bConfigurationValue = GS_ACM_CONFIG_ID, | |
269 | .iConfiguration = GS_ACM_CONFIG_STR_ID, | |
270 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, | |
271 | .bMaxPower = 1, | |
272 | }; | |
273 | ||
274 | static const struct usb_interface_descriptor gs_bulk_interface_desc = { | |
275 | .bLength = USB_DT_INTERFACE_SIZE, | |
276 | .bDescriptorType = USB_DT_INTERFACE, | |
277 | .bInterfaceNumber = GS_BULK_INTERFACE_ID, | |
278 | .bNumEndpoints = 2, | |
b9370332 | 279 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, |
1da177e4 LT |
280 | .bInterfaceSubClass = 0, |
281 | .bInterfaceProtocol = 0, | |
282 | .iInterface = GS_DATA_STR_ID, | |
283 | }; | |
284 | ||
285 | static const struct usb_interface_descriptor gs_control_interface_desc = { | |
286 | .bLength = USB_DT_INTERFACE_SIZE, | |
287 | .bDescriptorType = USB_DT_INTERFACE, | |
288 | .bInterfaceNumber = GS_CONTROL_INTERFACE_ID, | |
289 | .bNumEndpoints = 1, | |
290 | .bInterfaceClass = USB_CLASS_COMM, | |
291 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, | |
292 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER, | |
293 | .iInterface = GS_CONTROL_STR_ID, | |
294 | }; | |
295 | ||
296 | static const struct usb_interface_descriptor gs_data_interface_desc = { | |
297 | .bLength = USB_DT_INTERFACE_SIZE, | |
298 | .bDescriptorType = USB_DT_INTERFACE, | |
299 | .bInterfaceNumber = GS_DATA_INTERFACE_ID, | |
300 | .bNumEndpoints = 2, | |
301 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
302 | .bInterfaceSubClass = 0, | |
303 | .bInterfaceProtocol = 0, | |
304 | .iInterface = GS_DATA_STR_ID, | |
305 | }; | |
306 | ||
307 | static const struct usb_cdc_header_desc gs_header_desc = { | |
308 | .bLength = sizeof(gs_header_desc), | |
309 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
310 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
311 | .bcdCDC = __constant_cpu_to_le16(0x0110), | |
312 | }; | |
313 | ||
314 | static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = { | |
51a0e85c DB |
315 | .bLength = sizeof(gs_call_mgmt_descriptor), |
316 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
317 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, | |
318 | .bmCapabilities = 0, | |
319 | .bDataInterface = 1, /* index of data interface */ | |
1da177e4 LT |
320 | }; |
321 | ||
322 | static struct usb_cdc_acm_descriptor gs_acm_descriptor = { | |
51a0e85c DB |
323 | .bLength = sizeof(gs_acm_descriptor), |
324 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
325 | .bDescriptorSubType = USB_CDC_ACM_TYPE, | |
f371e750 | 326 | .bmCapabilities = (1 << 1), |
1da177e4 LT |
327 | }; |
328 | ||
329 | static const struct usb_cdc_union_desc gs_union_desc = { | |
330 | .bLength = sizeof(gs_union_desc), | |
331 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
332 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
333 | .bMasterInterface0 = 0, /* index of control interface */ | |
334 | .bSlaveInterface0 = 1, /* index of data interface */ | |
335 | }; | |
51a0e85c | 336 | |
1da177e4 LT |
337 | static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = { |
338 | .bLength = USB_DT_ENDPOINT_SIZE, | |
339 | .bDescriptorType = USB_DT_ENDPOINT, | |
340 | .bEndpointAddress = USB_DIR_IN, | |
341 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
342 | .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET), | |
343 | .bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL, | |
344 | }; | |
345 | ||
346 | static struct usb_endpoint_descriptor gs_fullspeed_in_desc = { | |
347 | .bLength = USB_DT_ENDPOINT_SIZE, | |
348 | .bDescriptorType = USB_DT_ENDPOINT, | |
349 | .bEndpointAddress = USB_DIR_IN, | |
350 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
351 | }; | |
352 | ||
353 | static struct usb_endpoint_descriptor gs_fullspeed_out_desc = { | |
354 | .bLength = USB_DT_ENDPOINT_SIZE, | |
355 | .bDescriptorType = USB_DT_ENDPOINT, | |
356 | .bEndpointAddress = USB_DIR_OUT, | |
357 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
358 | }; | |
359 | ||
360 | static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = { | |
361 | (struct usb_descriptor_header *) &gs_otg_descriptor, | |
362 | (struct usb_descriptor_header *) &gs_bulk_interface_desc, | |
363 | (struct usb_descriptor_header *) &gs_fullspeed_in_desc, | |
364 | (struct usb_descriptor_header *) &gs_fullspeed_out_desc, | |
365 | NULL, | |
366 | }; | |
367 | ||
368 | static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = { | |
369 | (struct usb_descriptor_header *) &gs_otg_descriptor, | |
370 | (struct usb_descriptor_header *) &gs_control_interface_desc, | |
371 | (struct usb_descriptor_header *) &gs_header_desc, | |
372 | (struct usb_descriptor_header *) &gs_call_mgmt_descriptor, | |
373 | (struct usb_descriptor_header *) &gs_acm_descriptor, | |
374 | (struct usb_descriptor_header *) &gs_union_desc, | |
375 | (struct usb_descriptor_header *) &gs_fullspeed_notify_desc, | |
376 | (struct usb_descriptor_header *) &gs_data_interface_desc, | |
377 | (struct usb_descriptor_header *) &gs_fullspeed_in_desc, | |
378 | (struct usb_descriptor_header *) &gs_fullspeed_out_desc, | |
379 | NULL, | |
380 | }; | |
381 | ||
1da177e4 LT |
382 | static struct usb_endpoint_descriptor gs_highspeed_notify_desc = { |
383 | .bLength = USB_DT_ENDPOINT_SIZE, | |
384 | .bDescriptorType = USB_DT_ENDPOINT, | |
385 | .bEndpointAddress = USB_DIR_IN, | |
386 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
387 | .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET), | |
388 | .bInterval = GS_LOG2_NOTIFY_INTERVAL+4, | |
389 | }; | |
390 | ||
391 | static struct usb_endpoint_descriptor gs_highspeed_in_desc = { | |
392 | .bLength = USB_DT_ENDPOINT_SIZE, | |
393 | .bDescriptorType = USB_DT_ENDPOINT, | |
394 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
395 | .wMaxPacketSize = __constant_cpu_to_le16(512), | |
396 | }; | |
397 | ||
398 | static struct usb_endpoint_descriptor gs_highspeed_out_desc = { | |
399 | .bLength = USB_DT_ENDPOINT_SIZE, | |
400 | .bDescriptorType = USB_DT_ENDPOINT, | |
401 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
402 | .wMaxPacketSize = __constant_cpu_to_le16(512), | |
403 | }; | |
404 | ||
405 | static struct usb_qualifier_descriptor gs_qualifier_desc = { | |
406 | .bLength = sizeof(struct usb_qualifier_descriptor), | |
407 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
408 | .bcdUSB = __constant_cpu_to_le16 (0x0200), | |
409 | /* assumes ep0 uses the same value for both speeds ... */ | |
410 | .bNumConfigurations = GS_NUM_CONFIGS, | |
411 | }; | |
412 | ||
413 | static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = { | |
414 | (struct usb_descriptor_header *) &gs_otg_descriptor, | |
415 | (struct usb_descriptor_header *) &gs_bulk_interface_desc, | |
416 | (struct usb_descriptor_header *) &gs_highspeed_in_desc, | |
417 | (struct usb_descriptor_header *) &gs_highspeed_out_desc, | |
418 | NULL, | |
419 | }; | |
420 | ||
421 | static const struct usb_descriptor_header *gs_acm_highspeed_function[] = { | |
422 | (struct usb_descriptor_header *) &gs_otg_descriptor, | |
423 | (struct usb_descriptor_header *) &gs_control_interface_desc, | |
424 | (struct usb_descriptor_header *) &gs_header_desc, | |
425 | (struct usb_descriptor_header *) &gs_call_mgmt_descriptor, | |
426 | (struct usb_descriptor_header *) &gs_acm_descriptor, | |
427 | (struct usb_descriptor_header *) &gs_union_desc, | |
428 | (struct usb_descriptor_header *) &gs_highspeed_notify_desc, | |
429 | (struct usb_descriptor_header *) &gs_data_interface_desc, | |
430 | (struct usb_descriptor_header *) &gs_highspeed_in_desc, | |
431 | (struct usb_descriptor_header *) &gs_highspeed_out_desc, | |
432 | NULL, | |
433 | }; | |
434 | ||
1da177e4 | 435 | |
9079e91b DB |
436 | /*-------------------------------------------------------------------------*/ |
437 | ||
1da177e4 LT |
438 | /* Module */ |
439 | MODULE_DESCRIPTION(GS_LONG_NAME); | |
440 | MODULE_AUTHOR("Al Borchers"); | |
441 | MODULE_LICENSE("GPL"); | |
442 | ||
51a0e85c | 443 | #ifdef DEBUG |
1da177e4 LT |
444 | module_param(debug, int, S_IRUGO|S_IWUSR); |
445 | MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on"); | |
446 | #endif | |
447 | ||
9079e91b | 448 | static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE; |
1da177e4 LT |
449 | module_param(read_q_size, uint, S_IRUGO); |
450 | MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32"); | |
451 | ||
9079e91b | 452 | static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE; |
1da177e4 LT |
453 | module_param(write_q_size, uint, S_IRUGO); |
454 | MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32"); | |
455 | ||
9079e91b | 456 | static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE; |
1da177e4 LT |
457 | module_param(write_buf_size, uint, S_IRUGO); |
458 | MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192"); | |
459 | ||
9079e91b | 460 | static unsigned int use_acm = GS_DEFAULT_USE_ACM; |
1da177e4 LT |
461 | module_param(use_acm, uint, S_IRUGO); |
462 | MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no"); | |
463 | ||
9079e91b | 464 | /*-------------------------------------------------------------------------*/ |
1da177e4 LT |
465 | |
466 | /* TTY Driver */ | |
467 | ||
468 | /* | |
469 | * gs_open | |
470 | */ | |
471 | static int gs_open(struct tty_struct *tty, struct file *file) | |
472 | { | |
473 | int port_num; | |
474 | unsigned long flags; | |
475 | struct gs_port *port; | |
476 | struct gs_dev *dev; | |
477 | struct gs_buf *buf; | |
831c70fc | 478 | struct mutex *mtx; |
1da177e4 LT |
479 | int ret; |
480 | ||
481 | port_num = tty->index; | |
482 | ||
483 | gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file); | |
484 | ||
485 | if (port_num < 0 || port_num >= GS_NUM_PORTS) { | |
00274921 | 486 | pr_err("gs_open: (%d,%p,%p) invalid port number\n", |
1da177e4 LT |
487 | port_num, tty, file); |
488 | return -ENODEV; | |
489 | } | |
490 | ||
491 | dev = gs_device; | |
492 | ||
493 | if (dev == NULL) { | |
00274921 | 494 | pr_err("gs_open: (%d,%p,%p) NULL device pointer\n", |
1da177e4 LT |
495 | port_num, tty, file); |
496 | return -ENODEV; | |
497 | } | |
498 | ||
831c70fc MK |
499 | mtx = &gs_open_close_lock[port_num]; |
500 | if (mutex_lock_interruptible(mtx)) { | |
00274921 | 501 | pr_err("gs_open: (%d,%p,%p) interrupted waiting for mutex\n", |
1da177e4 LT |
502 | port_num, tty, file); |
503 | return -ERESTARTSYS; | |
504 | } | |
505 | ||
506 | spin_lock_irqsave(&dev->dev_lock, flags); | |
507 | ||
508 | if (dev->dev_config == GS_NO_CONFIG_ID) { | |
00274921 | 509 | pr_err("gs_open: (%d,%p,%p) device is not connected\n", |
1da177e4 LT |
510 | port_num, tty, file); |
511 | ret = -ENODEV; | |
512 | goto exit_unlock_dev; | |
513 | } | |
514 | ||
515 | port = dev->dev_port[port_num]; | |
516 | ||
517 | if (port == NULL) { | |
00274921 | 518 | pr_err("gs_open: (%d,%p,%p) NULL port pointer\n", |
1da177e4 LT |
519 | port_num, tty, file); |
520 | ret = -ENODEV; | |
521 | goto exit_unlock_dev; | |
522 | } | |
523 | ||
524 | spin_lock(&port->port_lock); | |
525 | spin_unlock(&dev->dev_lock); | |
526 | ||
527 | if (port->port_dev == NULL) { | |
00274921 | 528 | pr_err("gs_open: (%d,%p,%p) port disconnected (1)\n", |
1da177e4 LT |
529 | port_num, tty, file); |
530 | ret = -EIO; | |
531 | goto exit_unlock_port; | |
532 | } | |
533 | ||
534 | if (port->port_open_count > 0) { | |
535 | ++port->port_open_count; | |
536 | gs_debug("gs_open: (%d,%p,%p) already open\n", | |
537 | port_num, tty, file); | |
538 | ret = 0; | |
539 | goto exit_unlock_port; | |
540 | } | |
541 | ||
542 | tty->driver_data = NULL; | |
543 | ||
544 | /* mark port as in use, we can drop port lock and sleep if necessary */ | |
545 | port->port_in_use = 1; | |
546 | ||
547 | /* allocate write buffer on first open */ | |
548 | if (port->port_write_buf == NULL) { | |
549 | spin_unlock_irqrestore(&port->port_lock, flags); | |
550 | buf = gs_buf_alloc(write_buf_size, GFP_KERNEL); | |
551 | spin_lock_irqsave(&port->port_lock, flags); | |
552 | ||
553 | /* might have been disconnected while asleep, check */ | |
554 | if (port->port_dev == NULL) { | |
00274921 | 555 | pr_err("gs_open: (%d,%p,%p) port disconnected (2)\n", |
1da177e4 LT |
556 | port_num, tty, file); |
557 | port->port_in_use = 0; | |
558 | ret = -EIO; | |
559 | goto exit_unlock_port; | |
560 | } | |
561 | ||
562 | if ((port->port_write_buf=buf) == NULL) { | |
00274921 DB |
563 | pr_err("gs_open: (%d,%p,%p) cannot allocate " |
564 | "port write buffer\n", | |
1da177e4 LT |
565 | port_num, tty, file); |
566 | port->port_in_use = 0; | |
567 | ret = -ENOMEM; | |
568 | goto exit_unlock_port; | |
569 | } | |
570 | ||
571 | } | |
572 | ||
573 | /* wait for carrier detect (not implemented) */ | |
574 | ||
575 | /* might have been disconnected while asleep, check */ | |
576 | if (port->port_dev == NULL) { | |
00274921 | 577 | pr_err("gs_open: (%d,%p,%p) port disconnected (3)\n", |
1da177e4 LT |
578 | port_num, tty, file); |
579 | port->port_in_use = 0; | |
580 | ret = -EIO; | |
581 | goto exit_unlock_port; | |
582 | } | |
583 | ||
584 | tty->driver_data = port; | |
585 | port->port_tty = tty; | |
586 | port->port_open_count = 1; | |
587 | port->port_in_use = 0; | |
588 | ||
589 | gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file); | |
590 | ||
591 | ret = 0; | |
592 | ||
593 | exit_unlock_port: | |
594 | spin_unlock_irqrestore(&port->port_lock, flags); | |
831c70fc | 595 | mutex_unlock(mtx); |
1da177e4 LT |
596 | return ret; |
597 | ||
598 | exit_unlock_dev: | |
599 | spin_unlock_irqrestore(&dev->dev_lock, flags); | |
831c70fc | 600 | mutex_unlock(mtx); |
1da177e4 LT |
601 | return ret; |
602 | ||
603 | } | |
604 | ||
605 | /* | |
606 | * gs_close | |
607 | */ | |
943e1b4d | 608 | |
9079e91b DB |
609 | static int gs_write_finished_event_safely(struct gs_port *p) |
610 | { | |
611 | int cond; | |
612 | ||
613 | spin_lock_irq(&(p)->port_lock); | |
614 | cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); | |
615 | spin_unlock_irq(&(p)->port_lock); | |
616 | return cond; | |
617 | } | |
943e1b4d | 618 | |
1da177e4 LT |
619 | static void gs_close(struct tty_struct *tty, struct file *file) |
620 | { | |
1da177e4 | 621 | struct gs_port *port = tty->driver_data; |
831c70fc | 622 | struct mutex *mtx; |
1da177e4 LT |
623 | |
624 | if (port == NULL) { | |
00274921 | 625 | pr_err("gs_close: NULL port pointer\n"); |
1da177e4 LT |
626 | return; |
627 | } | |
628 | ||
629 | gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file); | |
630 | ||
831c70fc MK |
631 | mtx = &gs_open_close_lock[port->port_num]; |
632 | mutex_lock(mtx); | |
1da177e4 | 633 | |
ca094f11 | 634 | spin_lock_irq(&port->port_lock); |
1da177e4 LT |
635 | |
636 | if (port->port_open_count == 0) { | |
00274921 | 637 | pr_err("gs_close: (%d,%p,%p) port is already closed\n", |
1da177e4 LT |
638 | port->port_num, tty, file); |
639 | goto exit; | |
640 | } | |
641 | ||
642 | if (port->port_open_count > 1) { | |
643 | --port->port_open_count; | |
644 | goto exit; | |
645 | } | |
646 | ||
647 | /* free disconnected port on final close */ | |
648 | if (port->port_dev == NULL) { | |
649 | kfree(port); | |
650 | goto exit; | |
651 | } | |
652 | ||
653 | /* mark port as closed but in use, we can drop port lock */ | |
654 | /* and sleep if necessary */ | |
655 | port->port_in_use = 1; | |
656 | port->port_open_count = 0; | |
657 | ||
658 | /* wait for write buffer to drain, or */ | |
659 | /* at most GS_CLOSE_TIMEOUT seconds */ | |
660 | if (gs_buf_data_avail(port->port_write_buf) > 0) { | |
ca094f11 | 661 | spin_unlock_irq(&port->port_lock); |
943e1b4d | 662 | wait_event_interruptible_timeout(port->port_write_wait, |
9079e91b | 663 | gs_write_finished_event_safely(port), |
943e1b4d | 664 | GS_CLOSE_TIMEOUT * HZ); |
ca094f11 | 665 | spin_lock_irq(&port->port_lock); |
1da177e4 LT |
666 | } |
667 | ||
668 | /* free disconnected port on final close */ | |
669 | /* (might have happened during the above sleep) */ | |
670 | if (port->port_dev == NULL) { | |
671 | kfree(port); | |
672 | goto exit; | |
673 | } | |
674 | ||
675 | gs_buf_clear(port->port_write_buf); | |
676 | ||
677 | tty->driver_data = NULL; | |
678 | port->port_tty = NULL; | |
679 | port->port_in_use = 0; | |
680 | ||
681 | gs_debug("gs_close: (%d,%p,%p) completed\n", | |
682 | port->port_num, tty, file); | |
683 | ||
684 | exit: | |
ca094f11 | 685 | spin_unlock_irq(&port->port_lock); |
831c70fc | 686 | mutex_unlock(mtx); |
1da177e4 LT |
687 | } |
688 | ||
689 | /* | |
690 | * gs_write | |
691 | */ | |
692 | static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
693 | { | |
694 | unsigned long flags; | |
695 | struct gs_port *port = tty->driver_data; | |
696 | int ret; | |
697 | ||
698 | if (port == NULL) { | |
00274921 | 699 | pr_err("gs_write: NULL port pointer\n"); |
1da177e4 LT |
700 | return -EIO; |
701 | } | |
702 | ||
703 | gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty, | |
704 | count); | |
705 | ||
706 | if (count == 0) | |
707 | return 0; | |
708 | ||
709 | spin_lock_irqsave(&port->port_lock, flags); | |
710 | ||
711 | if (port->port_dev == NULL) { | |
00274921 | 712 | pr_err("gs_write: (%d,%p) port is not connected\n", |
1da177e4 LT |
713 | port->port_num, tty); |
714 | ret = -EIO; | |
715 | goto exit; | |
716 | } | |
717 | ||
718 | if (port->port_open_count == 0) { | |
00274921 | 719 | pr_err("gs_write: (%d,%p) port is closed\n", |
1da177e4 LT |
720 | port->port_num, tty); |
721 | ret = -EBADF; | |
722 | goto exit; | |
723 | } | |
724 | ||
725 | count = gs_buf_put(port->port_write_buf, buf, count); | |
726 | ||
727 | spin_unlock_irqrestore(&port->port_lock, flags); | |
728 | ||
729 | gs_send(gs_device); | |
730 | ||
731 | gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty, | |
732 | count); | |
733 | ||
734 | return count; | |
735 | ||
736 | exit: | |
737 | spin_unlock_irqrestore(&port->port_lock, flags); | |
738 | return ret; | |
739 | } | |
740 | ||
741 | /* | |
742 | * gs_put_char | |
743 | */ | |
4cd55ab1 | 744 | static int gs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
745 | { |
746 | unsigned long flags; | |
747 | struct gs_port *port = tty->driver_data; | |
4cd55ab1 | 748 | int ret = 0; |
1da177e4 LT |
749 | |
750 | if (port == NULL) { | |
00274921 | 751 | pr_err("gs_put_char: NULL port pointer\n"); |
4cd55ab1 | 752 | return 0; |
1da177e4 LT |
753 | } |
754 | ||
51a0e85c DB |
755 | gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p\n", |
756 | port->port_num, tty, ch, __builtin_return_address(0)); | |
1da177e4 LT |
757 | |
758 | spin_lock_irqsave(&port->port_lock, flags); | |
759 | ||
760 | if (port->port_dev == NULL) { | |
00274921 | 761 | pr_err("gs_put_char: (%d,%p) port is not connected\n", |
1da177e4 LT |
762 | port->port_num, tty); |
763 | goto exit; | |
764 | } | |
765 | ||
766 | if (port->port_open_count == 0) { | |
00274921 | 767 | pr_err("gs_put_char: (%d,%p) port is closed\n", |
1da177e4 LT |
768 | port->port_num, tty); |
769 | goto exit; | |
770 | } | |
771 | ||
4cd55ab1 | 772 | ret = gs_buf_put(port->port_write_buf, &ch, 1); |
1da177e4 LT |
773 | |
774 | exit: | |
775 | spin_unlock_irqrestore(&port->port_lock, flags); | |
4cd55ab1 | 776 | return ret; |
1da177e4 LT |
777 | } |
778 | ||
779 | /* | |
780 | * gs_flush_chars | |
781 | */ | |
782 | static void gs_flush_chars(struct tty_struct *tty) | |
783 | { | |
784 | unsigned long flags; | |
785 | struct gs_port *port = tty->driver_data; | |
786 | ||
787 | if (port == NULL) { | |
00274921 | 788 | pr_err("gs_flush_chars: NULL port pointer\n"); |
1da177e4 LT |
789 | return; |
790 | } | |
791 | ||
792 | gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty); | |
793 | ||
794 | spin_lock_irqsave(&port->port_lock, flags); | |
795 | ||
796 | if (port->port_dev == NULL) { | |
00274921 | 797 | pr_err("gs_flush_chars: (%d,%p) port is not connected\n", |
1da177e4 LT |
798 | port->port_num, tty); |
799 | goto exit; | |
800 | } | |
801 | ||
802 | if (port->port_open_count == 0) { | |
00274921 | 803 | pr_err("gs_flush_chars: (%d,%p) port is closed\n", |
1da177e4 LT |
804 | port->port_num, tty); |
805 | goto exit; | |
806 | } | |
807 | ||
808 | spin_unlock_irqrestore(&port->port_lock, flags); | |
809 | ||
810 | gs_send(gs_device); | |
811 | ||
812 | return; | |
813 | ||
814 | exit: | |
815 | spin_unlock_irqrestore(&port->port_lock, flags); | |
816 | } | |
817 | ||
818 | /* | |
819 | * gs_write_room | |
820 | */ | |
821 | static int gs_write_room(struct tty_struct *tty) | |
822 | { | |
823 | ||
824 | int room = 0; | |
825 | unsigned long flags; | |
826 | struct gs_port *port = tty->driver_data; | |
827 | ||
828 | ||
829 | if (port == NULL) | |
830 | return 0; | |
831 | ||
832 | spin_lock_irqsave(&port->port_lock, flags); | |
833 | ||
834 | if (port->port_dev != NULL && port->port_open_count > 0 | |
835 | && port->port_write_buf != NULL) | |
836 | room = gs_buf_space_avail(port->port_write_buf); | |
837 | ||
838 | spin_unlock_irqrestore(&port->port_lock, flags); | |
839 | ||
840 | gs_debug("gs_write_room: (%d,%p) room=%d\n", | |
841 | port->port_num, tty, room); | |
842 | ||
843 | return room; | |
844 | } | |
845 | ||
846 | /* | |
847 | * gs_chars_in_buffer | |
848 | */ | |
849 | static int gs_chars_in_buffer(struct tty_struct *tty) | |
850 | { | |
851 | int chars = 0; | |
852 | unsigned long flags; | |
853 | struct gs_port *port = tty->driver_data; | |
854 | ||
855 | if (port == NULL) | |
856 | return 0; | |
857 | ||
858 | spin_lock_irqsave(&port->port_lock, flags); | |
859 | ||
860 | if (port->port_dev != NULL && port->port_open_count > 0 | |
861 | && port->port_write_buf != NULL) | |
862 | chars = gs_buf_data_avail(port->port_write_buf); | |
863 | ||
864 | spin_unlock_irqrestore(&port->port_lock, flags); | |
865 | ||
866 | gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n", | |
867 | port->port_num, tty, chars); | |
868 | ||
869 | return chars; | |
870 | } | |
871 | ||
872 | /* | |
873 | * gs_throttle | |
874 | */ | |
875 | static void gs_throttle(struct tty_struct *tty) | |
876 | { | |
877 | } | |
878 | ||
879 | /* | |
880 | * gs_unthrottle | |
881 | */ | |
882 | static void gs_unthrottle(struct tty_struct *tty) | |
883 | { | |
884 | } | |
885 | ||
886 | /* | |
887 | * gs_break | |
888 | */ | |
889 | static void gs_break(struct tty_struct *tty, int break_state) | |
890 | { | |
891 | } | |
892 | ||
893 | /* | |
894 | * gs_ioctl | |
895 | */ | |
896 | static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) | |
897 | { | |
898 | struct gs_port *port = tty->driver_data; | |
899 | ||
900 | if (port == NULL) { | |
00274921 | 901 | pr_err("gs_ioctl: NULL port pointer\n"); |
1da177e4 LT |
902 | return -EIO; |
903 | } | |
904 | ||
905 | gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n", | |
906 | port->port_num, tty, file, cmd, arg); | |
907 | ||
908 | /* handle ioctls */ | |
909 | ||
910 | /* could not handle ioctl */ | |
911 | return -ENOIOCTLCMD; | |
912 | } | |
913 | ||
914 | /* | |
915 | * gs_set_termios | |
916 | */ | |
606d099c | 917 | static void gs_set_termios(struct tty_struct *tty, struct ktermios *old) |
1da177e4 LT |
918 | { |
919 | } | |
920 | ||
9079e91b DB |
921 | static const struct tty_operations gs_tty_ops = { |
922 | .open = gs_open, | |
923 | .close = gs_close, | |
924 | .write = gs_write, | |
925 | .put_char = gs_put_char, | |
926 | .flush_chars = gs_flush_chars, | |
927 | .write_room = gs_write_room, | |
928 | .ioctl = gs_ioctl, | |
929 | .set_termios = gs_set_termios, | |
930 | .throttle = gs_throttle, | |
931 | .unthrottle = gs_unthrottle, | |
932 | .break_ctl = gs_break, | |
933 | .chars_in_buffer = gs_chars_in_buffer, | |
934 | }; | |
935 | ||
936 | /*-------------------------------------------------------------------------*/ | |
937 | ||
1da177e4 LT |
938 | /* |
939 | * gs_send | |
940 | * | |
941 | * This function finds available write requests, calls | |
942 | * gs_send_packet to fill these packets with data, and | |
943 | * continues until either there are no more write requests | |
944 | * available or no more data to send. This function is | |
945 | * run whenever data arrives or write requests are available. | |
946 | */ | |
947 | static int gs_send(struct gs_dev *dev) | |
948 | { | |
949 | int ret,len; | |
950 | unsigned long flags; | |
951 | struct usb_ep *ep; | |
952 | struct usb_request *req; | |
1da177e4 LT |
953 | |
954 | if (dev == NULL) { | |
00274921 | 955 | pr_err("gs_send: NULL device pointer\n"); |
1da177e4 LT |
956 | return -ENODEV; |
957 | } | |
958 | ||
959 | spin_lock_irqsave(&dev->dev_lock, flags); | |
960 | ||
961 | ep = dev->dev_in_ep; | |
962 | ||
963 | while(!list_empty(&dev->dev_req_list)) { | |
964 | ||
2c2d28a0 DB |
965 | req = list_entry(dev->dev_req_list.next, |
966 | struct usb_request, list); | |
1da177e4 LT |
967 | |
968 | len = gs_send_packet(dev, req->buf, ep->maxpacket); | |
969 | ||
970 | if (len > 0) { | |
51a0e85c DB |
971 | gs_debug_level(3, "gs_send: len=%d, 0x%2.2x " |
972 | "0x%2.2x 0x%2.2x ...\n", len, | |
973 | *((unsigned char *)req->buf), | |
974 | *((unsigned char *)req->buf+1), | |
975 | *((unsigned char *)req->buf+2)); | |
2c2d28a0 | 976 | list_del(&req->list); |
1da177e4 | 977 | req->length = len; |
80f8af0c | 978 | spin_unlock_irqrestore(&dev->dev_lock, flags); |
1da177e4 | 979 | if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) { |
00274921 | 980 | pr_err( |
1da177e4 LT |
981 | "gs_send: cannot queue read request, ret=%d\n", |
982 | ret); | |
80f8af0c | 983 | spin_lock_irqsave(&dev->dev_lock, flags); |
1da177e4 LT |
984 | break; |
985 | } | |
80f8af0c | 986 | spin_lock_irqsave(&dev->dev_lock, flags); |
1da177e4 LT |
987 | } else { |
988 | break; | |
989 | } | |
990 | ||
991 | } | |
992 | ||
993 | spin_unlock_irqrestore(&dev->dev_lock, flags); | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | /* | |
999 | * gs_send_packet | |
1000 | * | |
1001 | * If there is data to send, a packet is built in the given | |
1002 | * buffer and the size is returned. If there is no data to | |
1003 | * send, 0 is returned. If there is any error a negative | |
1004 | * error number is returned. | |
1005 | * | |
1006 | * Called during USB completion routine, on interrupt time. | |
1007 | * | |
1008 | * We assume that disconnect will not happen until all completion | |
1009 | * routines have completed, so we can assume that the dev_port | |
1010 | * array does not change during the lifetime of this function. | |
1011 | */ | |
1012 | static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size) | |
1013 | { | |
1014 | unsigned int len; | |
1015 | struct gs_port *port; | |
1016 | ||
1017 | /* TEMPORARY -- only port 0 is supported right now */ | |
1018 | port = dev->dev_port[0]; | |
1019 | ||
1020 | if (port == NULL) { | |
00274921 | 1021 | pr_err("gs_send_packet: port=%d, NULL port pointer\n", 0); |
1da177e4 LT |
1022 | return -EIO; |
1023 | } | |
1024 | ||
1025 | spin_lock(&port->port_lock); | |
1026 | ||
1027 | len = gs_buf_data_avail(port->port_write_buf); | |
1028 | if (len < size) | |
1029 | size = len; | |
1030 | ||
1031 | if (size == 0) | |
1032 | goto exit; | |
1033 | ||
1034 | size = gs_buf_get(port->port_write_buf, packet, size); | |
1035 | ||
1036 | if (port->port_tty) | |
1037 | wake_up_interruptible(&port->port_tty->write_wait); | |
1038 | ||
1039 | exit: | |
1040 | spin_unlock(&port->port_lock); | |
1041 | return size; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * gs_recv_packet | |
1046 | * | |
1047 | * Called for each USB packet received. Reads the packet | |
1048 | * header and stuffs the data in the appropriate tty buffer. | |
1049 | * Returns 0 if successful, or a negative error number. | |
1050 | * | |
1051 | * Called during USB completion routine, on interrupt time. | |
1052 | * | |
1053 | * We assume that disconnect will not happen until all completion | |
1054 | * routines have completed, so we can assume that the dev_port | |
1055 | * array does not change during the lifetime of this function. | |
1056 | */ | |
1057 | static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size) | |
1058 | { | |
1059 | unsigned int len; | |
1060 | struct gs_port *port; | |
1061 | int ret; | |
33f0f88f | 1062 | struct tty_struct *tty; |
1da177e4 LT |
1063 | |
1064 | /* TEMPORARY -- only port 0 is supported right now */ | |
1065 | port = dev->dev_port[0]; | |
1066 | ||
1067 | if (port == NULL) { | |
00274921 | 1068 | pr_err("gs_recv_packet: port=%d, NULL port pointer\n", |
1da177e4 LT |
1069 | port->port_num); |
1070 | return -EIO; | |
1071 | } | |
1072 | ||
1073 | spin_lock(&port->port_lock); | |
1074 | ||
1075 | if (port->port_open_count == 0) { | |
00274921 | 1076 | pr_err("gs_recv_packet: port=%d, port is closed\n", |
1da177e4 LT |
1077 | port->port_num); |
1078 | ret = -EIO; | |
1079 | goto exit; | |
1080 | } | |
1081 | ||
33f0f88f AC |
1082 | |
1083 | tty = port->port_tty; | |
1084 | ||
1085 | if (tty == NULL) { | |
00274921 | 1086 | pr_err("gs_recv_packet: port=%d, NULL tty pointer\n", |
1da177e4 LT |
1087 | port->port_num); |
1088 | ret = -EIO; | |
1089 | goto exit; | |
1090 | } | |
1091 | ||
1092 | if (port->port_tty->magic != TTY_MAGIC) { | |
00274921 | 1093 | pr_err("gs_recv_packet: port=%d, bad tty magic\n", |
1da177e4 LT |
1094 | port->port_num); |
1095 | ret = -EIO; | |
1096 | goto exit; | |
1097 | } | |
1098 | ||
33f0f88f AC |
1099 | len = tty_buffer_request_room(tty, size); |
1100 | if (len > 0) { | |
1101 | tty_insert_flip_string(tty, packet, len); | |
1da177e4 LT |
1102 | tty_flip_buffer_push(port->port_tty); |
1103 | wake_up_interruptible(&port->port_tty->read_wait); | |
1104 | } | |
1da177e4 | 1105 | ret = 0; |
1da177e4 LT |
1106 | exit: |
1107 | spin_unlock(&port->port_lock); | |
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * gs_read_complete | |
1113 | */ | |
1114 | static void gs_read_complete(struct usb_ep *ep, struct usb_request *req) | |
1115 | { | |
1116 | int ret; | |
1117 | struct gs_dev *dev = ep->driver_data; | |
1118 | ||
1119 | if (dev == NULL) { | |
00274921 | 1120 | pr_err("gs_read_complete: NULL device pointer\n"); |
1da177e4 LT |
1121 | return; |
1122 | } | |
1123 | ||
1124 | switch(req->status) { | |
1125 | case 0: | |
51a0e85c | 1126 | /* normal completion */ |
1da177e4 LT |
1127 | gs_recv_packet(dev, req->buf, req->actual); |
1128 | requeue: | |
1129 | req->length = ep->maxpacket; | |
1130 | if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) { | |
00274921 | 1131 | pr_err( |
1da177e4 LT |
1132 | "gs_read_complete: cannot queue read request, ret=%d\n", |
1133 | ret); | |
1134 | } | |
1135 | break; | |
1136 | ||
1137 | case -ESHUTDOWN: | |
1138 | /* disconnect */ | |
1139 | gs_debug("gs_read_complete: shutdown\n"); | |
1140 | gs_free_req(ep, req); | |
1141 | break; | |
1142 | ||
1143 | default: | |
1144 | /* unexpected */ | |
00274921 | 1145 | pr_err( |
1da177e4 LT |
1146 | "gs_read_complete: unexpected status error, status=%d\n", |
1147 | req->status); | |
1148 | goto requeue; | |
1149 | break; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * gs_write_complete | |
1155 | */ | |
1156 | static void gs_write_complete(struct usb_ep *ep, struct usb_request *req) | |
1157 | { | |
1158 | struct gs_dev *dev = ep->driver_data; | |
1da177e4 LT |
1159 | |
1160 | if (dev == NULL) { | |
00274921 | 1161 | pr_err("gs_write_complete: NULL device pointer\n"); |
1da177e4 LT |
1162 | return; |
1163 | } | |
1164 | ||
1165 | switch(req->status) { | |
1166 | case 0: | |
1167 | /* normal completion */ | |
1168 | requeue: | |
1da177e4 | 1169 | spin_lock(&dev->dev_lock); |
2c2d28a0 | 1170 | list_add(&req->list, &dev->dev_req_list); |
1da177e4 LT |
1171 | spin_unlock(&dev->dev_lock); |
1172 | ||
1173 | gs_send(dev); | |
1174 | ||
1175 | break; | |
1176 | ||
1177 | case -ESHUTDOWN: | |
1178 | /* disconnect */ | |
1179 | gs_debug("gs_write_complete: shutdown\n"); | |
1180 | gs_free_req(ep, req); | |
1181 | break; | |
1182 | ||
1183 | default: | |
00274921 | 1184 | pr_err( |
1da177e4 LT |
1185 | "gs_write_complete: unexpected status error, status=%d\n", |
1186 | req->status); | |
1187 | goto requeue; | |
1188 | break; | |
1189 | } | |
1190 | } | |
1191 | ||
9079e91b DB |
1192 | /*-------------------------------------------------------------------------*/ |
1193 | ||
1da177e4 LT |
1194 | /* Gadget Driver */ |
1195 | ||
9079e91b DB |
1196 | /* |
1197 | * gs_unbind | |
1198 | * | |
1199 | * Called on module unload. Frees the control request and device | |
1200 | * structure. | |
1201 | */ | |
1202 | static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget) | |
1203 | { | |
1204 | struct gs_dev *dev = get_gadget_data(gadget); | |
1205 | ||
1206 | gs_device = NULL; | |
1207 | ||
1208 | /* read/write requests already freed, only control request remains */ | |
1209 | if (dev != NULL) { | |
1210 | if (dev->dev_ctrl_req != NULL) { | |
1211 | gs_free_req(gadget->ep0, dev->dev_ctrl_req); | |
1212 | dev->dev_ctrl_req = NULL; | |
1213 | } | |
734d37c6 | 1214 | gs_reset_config(dev); |
9079e91b | 1215 | gs_free_ports(dev); |
9079e91b DB |
1216 | kfree(dev); |
1217 | set_gadget_data(gadget, NULL); | |
1218 | } | |
1219 | ||
1220 | pr_info("gs_unbind: %s %s unbound\n", GS_LONG_NAME, | |
1221 | GS_VERSION_STR); | |
1222 | } | |
1223 | ||
1da177e4 LT |
1224 | /* |
1225 | * gs_bind | |
1226 | * | |
1227 | * Called on module load. Allocates and initializes the device | |
1228 | * structure and a control request. | |
1229 | */ | |
329af28b | 1230 | static int __init gs_bind(struct usb_gadget *gadget) |
1da177e4 LT |
1231 | { |
1232 | int ret; | |
1233 | struct usb_ep *ep; | |
1234 | struct gs_dev *dev; | |
91e79c91 | 1235 | int gcnum; |
1da177e4 | 1236 | |
91e79c91 DB |
1237 | /* Some controllers can't support CDC ACM: |
1238 | * - sh doesn't support multiple interfaces or configs; | |
1239 | * - sa1100 doesn't have a third interrupt endpoint | |
1240 | */ | |
1241 | if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget)) | |
1da177e4 | 1242 | use_acm = 0; |
91e79c91 DB |
1243 | |
1244 | gcnum = usb_gadget_controller_number(gadget); | |
1245 | if (gcnum >= 0) | |
1da177e4 | 1246 | gs_device_desc.bcdDevice = |
91e79c91 DB |
1247 | cpu_to_le16(GS_VERSION_NUM | gcnum); |
1248 | else { | |
00274921 | 1249 | pr_warning("gs_bind: controller '%s' not recognized\n", |
1da177e4 LT |
1250 | gadget->name); |
1251 | /* unrecognized, but safe unless bulk is REALLY quirky */ | |
1252 | gs_device_desc.bcdDevice = | |
1253 | __constant_cpu_to_le16(GS_VERSION_NUM|0x0099); | |
1254 | } | |
1255 | ||
734d37c6 DB |
1256 | dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL); |
1257 | if (dev == NULL) | |
1258 | return -ENOMEM; | |
1259 | ||
1da177e4 LT |
1260 | usb_ep_autoconfig_reset(gadget); |
1261 | ||
1262 | ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc); | |
1263 | if (!ep) | |
1264 | goto autoconf_fail; | |
734d37c6 DB |
1265 | dev->dev_in_ep = ep; |
1266 | ep->driver_data = dev; /* claim the endpoint */ | |
1da177e4 LT |
1267 | |
1268 | ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc); | |
1269 | if (!ep) | |
1270 | goto autoconf_fail; | |
734d37c6 DB |
1271 | dev->dev_out_ep = ep; |
1272 | ep->driver_data = dev; /* claim the endpoint */ | |
1da177e4 LT |
1273 | |
1274 | if (use_acm) { | |
1275 | ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc); | |
1276 | if (!ep) { | |
00274921 | 1277 | pr_err("gs_bind: cannot run ACM on %s\n", gadget->name); |
1da177e4 LT |
1278 | goto autoconf_fail; |
1279 | } | |
1280 | gs_device_desc.idProduct = __constant_cpu_to_le16( | |
1281 | GS_CDC_PRODUCT_ID), | |
734d37c6 DB |
1282 | dev->dev_notify_ep = ep; |
1283 | ep->driver_data = dev; /* claim the endpoint */ | |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | gs_device_desc.bDeviceClass = use_acm | |
1287 | ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC; | |
1288 | gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1289 | ||
51a0e85c DB |
1290 | if (gadget_is_dualspeed(gadget)) { |
1291 | gs_qualifier_desc.bDeviceClass = use_acm | |
1292 | ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC; | |
1293 | /* assume ep0 uses the same packet size for both speeds */ | |
1294 | gs_qualifier_desc.bMaxPacketSize0 = | |
1295 | gs_device_desc.bMaxPacketSize0; | |
1296 | /* assume endpoints are dual-speed */ | |
1297 | gs_highspeed_notify_desc.bEndpointAddress = | |
1298 | gs_fullspeed_notify_desc.bEndpointAddress; | |
1299 | gs_highspeed_in_desc.bEndpointAddress = | |
1300 | gs_fullspeed_in_desc.bEndpointAddress; | |
1301 | gs_highspeed_out_desc.bEndpointAddress = | |
1302 | gs_fullspeed_out_desc.bEndpointAddress; | |
1303 | } | |
1da177e4 LT |
1304 | |
1305 | usb_gadget_set_selfpowered(gadget); | |
1306 | ||
51a0e85c | 1307 | if (gadget_is_otg(gadget)) { |
1da177e4 LT |
1308 | gs_otg_descriptor.bmAttributes |= USB_OTG_HNP, |
1309 | gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
1310 | gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
1311 | } | |
1312 | ||
734d37c6 | 1313 | gs_device = dev; |
1da177e4 LT |
1314 | |
1315 | snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s", | |
96b644bd | 1316 | init_utsname()->sysname, init_utsname()->release, |
1da177e4 LT |
1317 | gadget->name); |
1318 | ||
1da177e4 LT |
1319 | dev->dev_gadget = gadget; |
1320 | spin_lock_init(&dev->dev_lock); | |
1321 | INIT_LIST_HEAD(&dev->dev_req_list); | |
1322 | set_gadget_data(gadget, dev); | |
1323 | ||
1324 | if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) { | |
00274921 | 1325 | pr_err("gs_bind: cannot allocate ports\n"); |
1da177e4 LT |
1326 | gs_unbind(gadget); |
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | /* preallocate control response and buffer */ | |
1331 | dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN, | |
1332 | GFP_KERNEL); | |
1333 | if (dev->dev_ctrl_req == NULL) { | |
1334 | gs_unbind(gadget); | |
1335 | return -ENOMEM; | |
1336 | } | |
1da177e4 LT |
1337 | gadget->ep0->driver_data = dev; |
1338 | ||
00274921 | 1339 | pr_info("gs_bind: %s %s bound\n", |
1da177e4 LT |
1340 | GS_LONG_NAME, GS_VERSION_STR); |
1341 | ||
1342 | return 0; | |
1343 | ||
1344 | autoconf_fail: | |
734d37c6 | 1345 | kfree(dev); |
00274921 | 1346 | pr_err("gs_bind: cannot autoconfigure on %s\n", gadget->name); |
1da177e4 LT |
1347 | return -ENODEV; |
1348 | } | |
1349 | ||
1da177e4 LT |
1350 | static int gs_setup_standard(struct usb_gadget *gadget, |
1351 | const struct usb_ctrlrequest *ctrl) | |
1352 | { | |
1353 | int ret = -EOPNOTSUPP; | |
1354 | struct gs_dev *dev = get_gadget_data(gadget); | |
1355 | struct usb_request *req = dev->dev_ctrl_req; | |
1bbc1696 DB |
1356 | u16 wIndex = le16_to_cpu(ctrl->wIndex); |
1357 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
1358 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
1da177e4 LT |
1359 | |
1360 | switch (ctrl->bRequest) { | |
1361 | case USB_REQ_GET_DESCRIPTOR: | |
1362 | if (ctrl->bRequestType != USB_DIR_IN) | |
1363 | break; | |
1364 | ||
1365 | switch (wValue >> 8) { | |
1366 | case USB_DT_DEVICE: | |
1367 | ret = min(wLength, | |
1368 | (u16)sizeof(struct usb_device_descriptor)); | |
1369 | memcpy(req->buf, &gs_device_desc, ret); | |
1370 | break; | |
1371 | ||
1da177e4 | 1372 | case USB_DT_DEVICE_QUALIFIER: |
51a0e85c | 1373 | if (!gadget_is_dualspeed(gadget)) |
1da177e4 LT |
1374 | break; |
1375 | ret = min(wLength, | |
1376 | (u16)sizeof(struct usb_qualifier_descriptor)); | |
1377 | memcpy(req->buf, &gs_qualifier_desc, ret); | |
1378 | break; | |
1379 | ||
1380 | case USB_DT_OTHER_SPEED_CONFIG: | |
51a0e85c | 1381 | if (!gadget_is_dualspeed(gadget)) |
1da177e4 LT |
1382 | break; |
1383 | /* fall through */ | |
1da177e4 | 1384 | case USB_DT_CONFIG: |
51a0e85c | 1385 | ret = gs_build_config_buf(req->buf, gadget, |
1da177e4 | 1386 | wValue >> 8, wValue & 0xff, |
51a0e85c | 1387 | gadget_is_otg(gadget)); |
1da177e4 LT |
1388 | if (ret >= 0) |
1389 | ret = min(wLength, (u16)ret); | |
1390 | break; | |
1391 | ||
1392 | case USB_DT_STRING: | |
1393 | /* wIndex == language code. */ | |
1394 | ret = usb_gadget_get_string(&gs_string_table, | |
1395 | wValue & 0xff, req->buf); | |
1396 | if (ret >= 0) | |
1397 | ret = min(wLength, (u16)ret); | |
1398 | break; | |
1399 | } | |
1400 | break; | |
1401 | ||
1402 | case USB_REQ_SET_CONFIGURATION: | |
1403 | if (ctrl->bRequestType != 0) | |
1404 | break; | |
1405 | spin_lock(&dev->dev_lock); | |
1406 | ret = gs_set_config(dev, wValue); | |
1407 | spin_unlock(&dev->dev_lock); | |
1408 | break; | |
1409 | ||
1410 | case USB_REQ_GET_CONFIGURATION: | |
1411 | if (ctrl->bRequestType != USB_DIR_IN) | |
1412 | break; | |
1413 | *(u8 *)req->buf = dev->dev_config; | |
1414 | ret = min(wLength, (u16)1); | |
1415 | break; | |
1416 | ||
1417 | case USB_REQ_SET_INTERFACE: | |
1418 | if (ctrl->bRequestType != USB_RECIP_INTERFACE | |
1419 | || !dev->dev_config | |
1420 | || wIndex >= GS_MAX_NUM_INTERFACES) | |
1421 | break; | |
1422 | if (dev->dev_config == GS_BULK_CONFIG_ID | |
1423 | && wIndex != GS_BULK_INTERFACE_ID) | |
1424 | break; | |
1425 | /* no alternate interface settings */ | |
1426 | if (wValue != 0) | |
1427 | break; | |
1428 | spin_lock(&dev->dev_lock); | |
1429 | /* PXA hardware partially handles SET_INTERFACE; | |
1430 | * we need to kluge around that interference. */ | |
1431 | if (gadget_is_pxa(gadget)) { | |
1432 | ret = gs_set_config(dev, use_acm ? | |
1433 | GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID); | |
1434 | goto set_interface_done; | |
1435 | } | |
1436 | if (dev->dev_config != GS_BULK_CONFIG_ID | |
1437 | && wIndex == GS_CONTROL_INTERFACE_ID) { | |
1438 | if (dev->dev_notify_ep) { | |
1439 | usb_ep_disable(dev->dev_notify_ep); | |
1440 | usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc); | |
1441 | } | |
1442 | } else { | |
1443 | usb_ep_disable(dev->dev_in_ep); | |
1444 | usb_ep_disable(dev->dev_out_ep); | |
1445 | usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc); | |
1446 | usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc); | |
1447 | } | |
1448 | ret = 0; | |
1449 | set_interface_done: | |
1450 | spin_unlock(&dev->dev_lock); | |
1451 | break; | |
1452 | ||
1453 | case USB_REQ_GET_INTERFACE: | |
1454 | if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE) | |
1455 | || dev->dev_config == GS_NO_CONFIG_ID) | |
1456 | break; | |
1457 | if (wIndex >= GS_MAX_NUM_INTERFACES | |
1458 | || (dev->dev_config == GS_BULK_CONFIG_ID | |
1459 | && wIndex != GS_BULK_INTERFACE_ID)) { | |
1460 | ret = -EDOM; | |
1461 | break; | |
1462 | } | |
1463 | /* no alternate interface settings */ | |
1464 | *(u8 *)req->buf = 0; | |
1465 | ret = min(wLength, (u16)1); | |
1466 | break; | |
1467 | ||
1468 | default: | |
00274921 DB |
1469 | pr_err("gs_setup: unknown standard request, type=%02x, " |
1470 | "request=%02x, value=%04x, index=%04x, length=%d\n", | |
1da177e4 LT |
1471 | ctrl->bRequestType, ctrl->bRequest, |
1472 | wValue, wIndex, wLength); | |
1473 | break; | |
1474 | } | |
1475 | ||
1476 | return ret; | |
1477 | } | |
1478 | ||
9079e91b DB |
1479 | static void gs_setup_complete_set_line_coding(struct usb_ep *ep, |
1480 | struct usb_request *req) | |
1481 | { | |
1482 | struct gs_dev *dev = ep->driver_data; | |
1483 | struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */ | |
1484 | ||
1485 | switch (req->status) { | |
1486 | case 0: | |
1487 | /* normal completion */ | |
1488 | if (req->actual != sizeof(port->port_line_coding)) | |
1489 | usb_ep_set_halt(ep); | |
1490 | else if (port) { | |
1491 | struct usb_cdc_line_coding *value = req->buf; | |
1492 | ||
1493 | /* REVISIT: we currently just remember this data. | |
1494 | * If we change that, (a) validate it first, then | |
1495 | * (b) update whatever hardware needs updating. | |
1496 | */ | |
1497 | spin_lock(&port->port_lock); | |
1498 | port->port_line_coding = *value; | |
1499 | spin_unlock(&port->port_lock); | |
1500 | } | |
1501 | break; | |
1502 | ||
1503 | case -ESHUTDOWN: | |
1504 | /* disconnect */ | |
1505 | gs_free_req(ep, req); | |
1506 | break; | |
1507 | ||
1508 | default: | |
1509 | /* unexpected */ | |
1510 | break; | |
1511 | } | |
1512 | return; | |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | static int gs_setup_class(struct usb_gadget *gadget, |
1516 | const struct usb_ctrlrequest *ctrl) | |
1517 | { | |
1518 | int ret = -EOPNOTSUPP; | |
1519 | struct gs_dev *dev = get_gadget_data(gadget); | |
1520 | struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */ | |
1521 | struct usb_request *req = dev->dev_ctrl_req; | |
1bbc1696 DB |
1522 | u16 wIndex = le16_to_cpu(ctrl->wIndex); |
1523 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
1524 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
1da177e4 LT |
1525 | |
1526 | switch (ctrl->bRequest) { | |
1527 | case USB_CDC_REQ_SET_LINE_CODING: | |
f371e750 DB |
1528 | if (wLength != sizeof(struct usb_cdc_line_coding)) |
1529 | break; | |
1530 | ret = wLength; | |
1531 | req->complete = gs_setup_complete_set_line_coding; | |
1da177e4 LT |
1532 | break; |
1533 | ||
1534 | case USB_CDC_REQ_GET_LINE_CODING: | |
f371e750 | 1535 | ret = min_t(int, wLength, sizeof(struct usb_cdc_line_coding)); |
1da177e4 LT |
1536 | if (port) { |
1537 | spin_lock(&port->port_lock); | |
1538 | memcpy(req->buf, &port->port_line_coding, ret); | |
1539 | spin_unlock(&port->port_lock); | |
1540 | } | |
1541 | break; | |
1542 | ||
1543 | case USB_CDC_REQ_SET_CONTROL_LINE_STATE: | |
f371e750 DB |
1544 | if (wLength != 0) |
1545 | break; | |
1546 | ret = 0; | |
1547 | if (port) { | |
1548 | /* REVISIT: we currently just remember this data. | |
1549 | * If we change that, update whatever hardware needs | |
1550 | * updating. | |
1551 | */ | |
1552 | spin_lock(&port->port_lock); | |
1553 | port->port_handshake_bits = wValue; | |
1554 | spin_unlock(&port->port_lock); | |
1555 | } | |
1da177e4 LT |
1556 | break; |
1557 | ||
1558 | default: | |
f371e750 DB |
1559 | /* NOTE: strictly speaking, we should accept AT-commands |
1560 | * using SEND_ENCPSULATED_COMMAND/GET_ENCAPSULATED_RESPONSE. | |
1561 | * But our call management descriptor says we don't handle | |
1562 | * call management, so we should be able to get by without | |
1563 | * handling those "required" commands (except by stalling). | |
1564 | */ | |
00274921 | 1565 | pr_err("gs_setup: unknown class request, " |
49b4f902 DB |
1566 | "type=%02x, request=%02x, value=%04x, " |
1567 | "index=%04x, length=%d\n", | |
1da177e4 LT |
1568 | ctrl->bRequestType, ctrl->bRequest, |
1569 | wValue, wIndex, wLength); | |
1570 | break; | |
1571 | } | |
1572 | ||
1573 | return ret; | |
1574 | } | |
1575 | ||
9079e91b DB |
1576 | /* |
1577 | * gs_setup_complete | |
1578 | */ | |
1579 | static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
f371e750 | 1580 | { |
9079e91b DB |
1581 | if (req->status || req->actual != req->length) { |
1582 | pr_err("gs_setup_complete: status error, status=%d, " | |
1583 | "actual=%d, length=%d\n", | |
1584 | req->status, req->actual, req->length); | |
1585 | } | |
1586 | } | |
f371e750 | 1587 | |
9079e91b DB |
1588 | /* |
1589 | * gs_setup | |
1590 | * | |
1591 | * Implements all the control endpoint functionality that's not | |
1592 | * handled in hardware or the hardware driver. | |
1593 | * | |
1594 | * Returns the size of the data sent to the host, or a negative | |
1595 | * error number. | |
1596 | */ | |
1597 | static int gs_setup(struct usb_gadget *gadget, | |
1598 | const struct usb_ctrlrequest *ctrl) | |
1599 | { | |
1600 | int ret = -EOPNOTSUPP; | |
1601 | struct gs_dev *dev = get_gadget_data(gadget); | |
1602 | struct usb_request *req = dev->dev_ctrl_req; | |
1603 | u16 wIndex = le16_to_cpu(ctrl->wIndex); | |
1604 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
1605 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
f371e750 | 1606 | |
9079e91b DB |
1607 | req->complete = gs_setup_complete; |
1608 | ||
1609 | switch (ctrl->bRequestType & USB_TYPE_MASK) { | |
1610 | case USB_TYPE_STANDARD: | |
1611 | ret = gs_setup_standard(gadget, ctrl); | |
f371e750 DB |
1612 | break; |
1613 | ||
9079e91b DB |
1614 | case USB_TYPE_CLASS: |
1615 | ret = gs_setup_class(gadget, ctrl); | |
f371e750 DB |
1616 | break; |
1617 | ||
1618 | default: | |
9079e91b DB |
1619 | pr_err("gs_setup: unknown request, type=%02x, request=%02x, " |
1620 | "value=%04x, index=%04x, length=%d\n", | |
1621 | ctrl->bRequestType, ctrl->bRequest, | |
1622 | wValue, wIndex, wLength); | |
f371e750 DB |
1623 | break; |
1624 | } | |
f371e750 | 1625 | |
9079e91b DB |
1626 | /* respond with data transfer before status phase? */ |
1627 | if (ret >= 0) { | |
1628 | req->length = ret; | |
1629 | req->zero = ret < wLength | |
1630 | && (ret % gadget->ep0->maxpacket) == 0; | |
1631 | ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
1632 | if (ret < 0) { | |
1633 | pr_err("gs_setup: cannot queue response, ret=%d\n", | |
1634 | ret); | |
1635 | req->status = 0; | |
1636 | gs_setup_complete(gadget->ep0, req); | |
1637 | } | |
1da177e4 | 1638 | } |
9079e91b DB |
1639 | |
1640 | /* device either stalls (ret < 0) or reports success */ | |
1641 | return ret; | |
1da177e4 LT |
1642 | } |
1643 | ||
1644 | /* | |
1645 | * gs_disconnect | |
1646 | * | |
1647 | * Called when the device is disconnected. Frees the closed | |
1648 | * ports and disconnects open ports. Open ports will be freed | |
1649 | * on close. Then reallocates the ports for the next connection. | |
1650 | */ | |
1651 | static void gs_disconnect(struct usb_gadget *gadget) | |
1652 | { | |
1653 | unsigned long flags; | |
1654 | struct gs_dev *dev = get_gadget_data(gadget); | |
1655 | ||
1656 | spin_lock_irqsave(&dev->dev_lock, flags); | |
1657 | ||
1658 | gs_reset_config(dev); | |
1659 | ||
1660 | /* free closed ports and disconnect open ports */ | |
1661 | /* (open ports will be freed when closed) */ | |
1662 | gs_free_ports(dev); | |
1663 | ||
1664 | /* re-allocate ports for the next connection */ | |
1665 | if (gs_alloc_ports(dev, GFP_ATOMIC) != 0) | |
00274921 | 1666 | pr_err("gs_disconnect: cannot re-allocate ports\n"); |
1da177e4 LT |
1667 | |
1668 | spin_unlock_irqrestore(&dev->dev_lock, flags); | |
1669 | ||
00274921 | 1670 | pr_info("gs_disconnect: %s disconnected\n", GS_LONG_NAME); |
1da177e4 LT |
1671 | } |
1672 | ||
9079e91b DB |
1673 | static struct usb_gadget_driver gs_gadget_driver = { |
1674 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
1675 | .speed = USB_SPEED_HIGH, | |
1676 | #else | |
1677 | .speed = USB_SPEED_FULL, | |
1678 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ | |
1679 | .function = GS_LONG_NAME, | |
1680 | .bind = gs_bind, | |
1681 | .unbind = gs_unbind, | |
1682 | .setup = gs_setup, | |
1683 | .disconnect = gs_disconnect, | |
1684 | .driver = { | |
1685 | .name = GS_SHORT_NAME, | |
1686 | .owner = THIS_MODULE, | |
1687 | }, | |
1688 | }; | |
1689 | ||
1da177e4 LT |
1690 | /* |
1691 | * gs_set_config | |
1692 | * | |
1693 | * Configures the device by enabling device specific | |
1694 | * optimizations, setting up the endpoints, allocating | |
1695 | * read and write requests and queuing read requests. | |
1696 | * | |
1697 | * The device lock must be held when calling this function. | |
1698 | */ | |
1699 | static int gs_set_config(struct gs_dev *dev, unsigned config) | |
1700 | { | |
1701 | int i; | |
1702 | int ret = 0; | |
1703 | struct usb_gadget *gadget = dev->dev_gadget; | |
1704 | struct usb_ep *ep; | |
734d37c6 | 1705 | struct usb_endpoint_descriptor *out, *in, *notify; |
1da177e4 | 1706 | struct usb_request *req; |
1da177e4 LT |
1707 | |
1708 | if (dev == NULL) { | |
00274921 | 1709 | pr_err("gs_set_config: NULL device pointer\n"); |
1da177e4 LT |
1710 | return 0; |
1711 | } | |
1712 | ||
1713 | if (config == dev->dev_config) | |
1714 | return 0; | |
1715 | ||
1716 | gs_reset_config(dev); | |
1717 | ||
1718 | switch (config) { | |
1719 | case GS_NO_CONFIG_ID: | |
1720 | return 0; | |
1721 | case GS_BULK_CONFIG_ID: | |
1722 | if (use_acm) | |
1723 | return -EINVAL; | |
1da177e4 LT |
1724 | break; |
1725 | case GS_ACM_CONFIG_ID: | |
1726 | if (!use_acm) | |
1727 | return -EINVAL; | |
1da177e4 LT |
1728 | break; |
1729 | default: | |
1730 | return -EINVAL; | |
1731 | } | |
1732 | ||
734d37c6 DB |
1733 | in = choose_ep_desc(gadget, |
1734 | &gs_highspeed_in_desc, | |
1735 | &gs_fullspeed_in_desc); | |
1736 | out = choose_ep_desc(gadget, | |
1737 | &gs_highspeed_out_desc, | |
1738 | &gs_fullspeed_out_desc); | |
1739 | notify = dev->dev_notify_ep | |
1740 | ? choose_ep_desc(gadget, | |
1da177e4 | 1741 | &gs_highspeed_notify_desc, |
734d37c6 DB |
1742 | &gs_fullspeed_notify_desc) |
1743 | : NULL; | |
1da177e4 | 1744 | |
734d37c6 DB |
1745 | ret = usb_ep_enable(dev->dev_in_ep, in); |
1746 | if (ret == 0) { | |
1747 | dev->dev_in_ep_desc = in; | |
1748 | } else { | |
1749 | pr_debug("%s: cannot enable %s %s, ret=%d\n", | |
1750 | __func__, "IN", dev->dev_in_ep->name, ret); | |
1751 | return ret; | |
1752 | } | |
1da177e4 | 1753 | |
734d37c6 DB |
1754 | ret = usb_ep_enable(dev->dev_out_ep, out); |
1755 | if (ret == 0) { | |
1756 | dev->dev_out_ep_desc = out; | |
1757 | } else { | |
1758 | pr_debug("%s: cannot enable %s %s, ret=%d\n", | |
1759 | __func__, "OUT", dev->dev_out_ep->name, ret); | |
1760 | fail0: | |
1761 | usb_ep_disable(dev->dev_in_ep); | |
1762 | return ret; | |
1da177e4 LT |
1763 | } |
1764 | ||
734d37c6 DB |
1765 | if (notify) { |
1766 | ret = usb_ep_enable(dev->dev_notify_ep, notify); | |
1767 | if (ret == 0) { | |
1768 | dev->dev_notify_ep_desc = notify; | |
1769 | } else { | |
1770 | pr_debug("%s: cannot enable %s %s, ret=%d\n", | |
1771 | __func__, "NOTIFY", | |
1772 | dev->dev_notify_ep->name, ret); | |
1773 | usb_ep_disable(dev->dev_out_ep); | |
1774 | goto fail0; | |
1775 | } | |
1da177e4 LT |
1776 | } |
1777 | ||
734d37c6 DB |
1778 | dev->dev_config = config; |
1779 | ||
1da177e4 LT |
1780 | /* allocate and queue read requests */ |
1781 | ep = dev->dev_out_ep; | |
1782 | for (i=0; i<read_q_size && ret == 0; i++) { | |
1783 | if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) { | |
1784 | req->complete = gs_read_complete; | |
1785 | if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) { | |
00274921 DB |
1786 | pr_err("gs_set_config: cannot queue read " |
1787 | "request, ret=%d\n", ret); | |
1da177e4 LT |
1788 | } |
1789 | } else { | |
00274921 DB |
1790 | pr_err("gs_set_config: cannot allocate " |
1791 | "read requests\n"); | |
1da177e4 LT |
1792 | ret = -ENOMEM; |
1793 | goto exit_reset_config; | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | /* allocate write requests, and put on free list */ | |
1798 | ep = dev->dev_in_ep; | |
1799 | for (i=0; i<write_q_size; i++) { | |
2c2d28a0 DB |
1800 | req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC); |
1801 | if (req) { | |
1802 | req->complete = gs_write_complete; | |
1803 | list_add(&req->list, &dev->dev_req_list); | |
1da177e4 | 1804 | } else { |
00274921 DB |
1805 | pr_err("gs_set_config: cannot allocate " |
1806 | "write requests\n"); | |
1da177e4 LT |
1807 | ret = -ENOMEM; |
1808 | goto exit_reset_config; | |
1809 | } | |
1810 | } | |
1811 | ||
f371e750 DB |
1812 | /* REVISIT the ACM mode should be able to actually *issue* some |
1813 | * notifications, for at least serial state change events if | |
1814 | * not also for network connection; say so in bmCapabilities. | |
1815 | */ | |
1816 | ||
00274921 | 1817 | pr_info("gs_set_config: %s configured, %s speed %s config\n", |
1da177e4 LT |
1818 | GS_LONG_NAME, |
1819 | gadget->speed == USB_SPEED_HIGH ? "high" : "full", | |
1820 | config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM"); | |
1821 | ||
1822 | return 0; | |
1823 | ||
1824 | exit_reset_config: | |
1825 | gs_reset_config(dev); | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * gs_reset_config | |
1831 | * | |
1832 | * Mark the device as not configured, disable all endpoints, | |
1833 | * which forces completion of pending I/O and frees queued | |
1834 | * requests, and free the remaining write requests on the | |
1835 | * free list. | |
1836 | * | |
1837 | * The device lock must be held when calling this function. | |
1838 | */ | |
1839 | static void gs_reset_config(struct gs_dev *dev) | |
1840 | { | |
2c2d28a0 | 1841 | struct usb_request *req; |
1da177e4 LT |
1842 | |
1843 | if (dev == NULL) { | |
00274921 | 1844 | pr_err("gs_reset_config: NULL device pointer\n"); |
1da177e4 LT |
1845 | return; |
1846 | } | |
1847 | ||
1848 | if (dev->dev_config == GS_NO_CONFIG_ID) | |
1849 | return; | |
1850 | ||
1851 | dev->dev_config = GS_NO_CONFIG_ID; | |
1852 | ||
1853 | /* free write requests on the free list */ | |
1854 | while(!list_empty(&dev->dev_req_list)) { | |
2c2d28a0 DB |
1855 | req = list_entry(dev->dev_req_list.next, |
1856 | struct usb_request, list); | |
1857 | list_del(&req->list); | |
1858 | gs_free_req(dev->dev_in_ep, req); | |
1da177e4 LT |
1859 | } |
1860 | ||
1861 | /* disable endpoints, forcing completion of pending i/o; */ | |
1862 | /* completion handlers free their requests in this case */ | |
734d37c6 | 1863 | if (dev->dev_notify_ep) |
1da177e4 | 1864 | usb_ep_disable(dev->dev_notify_ep); |
734d37c6 DB |
1865 | usb_ep_disable(dev->dev_in_ep); |
1866 | usb_ep_disable(dev->dev_out_ep); | |
1da177e4 LT |
1867 | } |
1868 | ||
1869 | /* | |
1870 | * gs_build_config_buf | |
1871 | * | |
1872 | * Builds the config descriptors in the given buffer and returns the | |
1873 | * length, or a negative error number. | |
1874 | */ | |
51a0e85c | 1875 | static int gs_build_config_buf(u8 *buf, struct usb_gadget *g, |
1da177e4 LT |
1876 | u8 type, unsigned int index, int is_otg) |
1877 | { | |
1878 | int len; | |
51a0e85c | 1879 | int high_speed = 0; |
1da177e4 LT |
1880 | const struct usb_config_descriptor *config_desc; |
1881 | const struct usb_descriptor_header **function; | |
1882 | ||
1883 | if (index >= gs_device_desc.bNumConfigurations) | |
1884 | return -EINVAL; | |
1885 | ||
1886 | /* other speed switches high and full speed */ | |
51a0e85c DB |
1887 | if (gadget_is_dualspeed(g)) { |
1888 | high_speed = (g->speed == USB_SPEED_HIGH); | |
1889 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
1890 | high_speed = !high_speed; | |
1891 | } | |
1da177e4 LT |
1892 | |
1893 | if (use_acm) { | |
1894 | config_desc = &gs_acm_config_desc; | |
51a0e85c DB |
1895 | function = high_speed |
1896 | ? gs_acm_highspeed_function | |
1897 | : gs_acm_fullspeed_function; | |
1da177e4 LT |
1898 | } else { |
1899 | config_desc = &gs_bulk_config_desc; | |
51a0e85c DB |
1900 | function = high_speed |
1901 | ? gs_bulk_highspeed_function | |
1902 | : gs_bulk_fullspeed_function; | |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | /* for now, don't advertise srp-only devices */ | |
1906 | if (!is_otg) | |
1907 | function++; | |
1908 | ||
1909 | len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function); | |
1910 | if (len < 0) | |
1911 | return len; | |
1912 | ||
1913 | ((struct usb_config_descriptor *)buf)->bDescriptorType = type; | |
1914 | ||
1915 | return len; | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * gs_alloc_req | |
1920 | * | |
1921 | * Allocate a usb_request and its buffer. Returns a pointer to the | |
1922 | * usb_request or NULL if there is an error. | |
1923 | */ | |
1bbc1696 | 1924 | static struct usb_request * |
55016f10 | 1925 | gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags) |
1da177e4 LT |
1926 | { |
1927 | struct usb_request *req; | |
1928 | ||
1929 | if (ep == NULL) | |
1930 | return NULL; | |
1931 | ||
1932 | req = usb_ep_alloc_request(ep, kmalloc_flags); | |
1933 | ||
1934 | if (req != NULL) { | |
1935 | req->length = len; | |
1936 | req->buf = kmalloc(len, kmalloc_flags); | |
1937 | if (req->buf == NULL) { | |
1938 | usb_ep_free_request(ep, req); | |
1939 | return NULL; | |
1940 | } | |
1941 | } | |
1942 | ||
1943 | return req; | |
1944 | } | |
1945 | ||
1946 | /* | |
1947 | * gs_free_req | |
1948 | * | |
1949 | * Free a usb_request and its buffer. | |
1950 | */ | |
1951 | static void gs_free_req(struct usb_ep *ep, struct usb_request *req) | |
1952 | { | |
1953 | if (ep != NULL && req != NULL) { | |
1954 | kfree(req->buf); | |
1955 | usb_ep_free_request(ep, req); | |
1956 | } | |
1957 | } | |
1958 | ||
1da177e4 LT |
1959 | /* |
1960 | * gs_alloc_ports | |
1961 | * | |
1962 | * Allocate all ports and set the gs_dev struct to point to them. | |
1963 | * Return 0 if successful, or a negative error number. | |
1964 | * | |
1965 | * The device lock is normally held when calling this function. | |
1966 | */ | |
55016f10 | 1967 | static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags) |
1da177e4 LT |
1968 | { |
1969 | int i; | |
1970 | struct gs_port *port; | |
1971 | ||
1972 | if (dev == NULL) | |
1973 | return -EIO; | |
1974 | ||
1975 | for (i=0; i<GS_NUM_PORTS; i++) { | |
7039f422 | 1976 | if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL) |
1da177e4 LT |
1977 | return -ENOMEM; |
1978 | ||
1da177e4 LT |
1979 | port->port_dev = dev; |
1980 | port->port_num = i; | |
1981 | port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE); | |
1982 | port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT; | |
1983 | port->port_line_coding.bParityType = GS_DEFAULT_PARITY; | |
1984 | port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS; | |
1985 | spin_lock_init(&port->port_lock); | |
1986 | init_waitqueue_head(&port->port_write_wait); | |
1987 | ||
1988 | dev->dev_port[i] = port; | |
1989 | } | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * gs_free_ports | |
1996 | * | |
1997 | * Free all closed ports. Open ports are disconnected by | |
1998 | * freeing their write buffers, setting their device pointers | |
1999 | * and the pointers to them in the device to NULL. These | |
2000 | * ports will be freed when closed. | |
2001 | * | |
2002 | * The device lock is normally held when calling this function. | |
2003 | */ | |
2004 | static void gs_free_ports(struct gs_dev *dev) | |
2005 | { | |
2006 | int i; | |
2007 | unsigned long flags; | |
2008 | struct gs_port *port; | |
2009 | ||
2010 | if (dev == NULL) | |
2011 | return; | |
2012 | ||
2013 | for (i=0; i<GS_NUM_PORTS; i++) { | |
2014 | if ((port=dev->dev_port[i]) != NULL) { | |
2015 | dev->dev_port[i] = NULL; | |
2016 | ||
2017 | spin_lock_irqsave(&port->port_lock, flags); | |
2018 | ||
2019 | if (port->port_write_buf != NULL) { | |
2020 | gs_buf_free(port->port_write_buf); | |
2021 | port->port_write_buf = NULL; | |
2022 | } | |
2023 | ||
2024 | if (port->port_open_count > 0 || port->port_in_use) { | |
2025 | port->port_dev = NULL; | |
2026 | wake_up_interruptible(&port->port_write_wait); | |
2027 | if (port->port_tty) { | |
4208978e | 2028 | tty_hangup(port->port_tty); |
1da177e4 LT |
2029 | } |
2030 | spin_unlock_irqrestore(&port->port_lock, flags); | |
2031 | } else { | |
2032 | spin_unlock_irqrestore(&port->port_lock, flags); | |
2033 | kfree(port); | |
2034 | } | |
2035 | ||
2036 | } | |
2037 | } | |
2038 | } | |
2039 | ||
9079e91b DB |
2040 | /*-------------------------------------------------------------------------*/ |
2041 | ||
1da177e4 LT |
2042 | /* Circular Buffer */ |
2043 | ||
2044 | /* | |
2045 | * gs_buf_alloc | |
2046 | * | |
2047 | * Allocate a circular buffer and all associated memory. | |
2048 | */ | |
55016f10 | 2049 | static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags) |
1da177e4 LT |
2050 | { |
2051 | struct gs_buf *gb; | |
2052 | ||
2053 | if (size == 0) | |
2054 | return NULL; | |
2055 | ||
5cbded58 | 2056 | gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags); |
1da177e4 LT |
2057 | if (gb == NULL) |
2058 | return NULL; | |
2059 | ||
2060 | gb->buf_buf = kmalloc(size, kmalloc_flags); | |
2061 | if (gb->buf_buf == NULL) { | |
2062 | kfree(gb); | |
2063 | return NULL; | |
2064 | } | |
2065 | ||
2066 | gb->buf_size = size; | |
2067 | gb->buf_get = gb->buf_put = gb->buf_buf; | |
2068 | ||
2069 | return gb; | |
2070 | } | |
2071 | ||
2072 | /* | |
2073 | * gs_buf_free | |
2074 | * | |
2075 | * Free the buffer and all associated memory. | |
2076 | */ | |
b29dbbd8 | 2077 | static void gs_buf_free(struct gs_buf *gb) |
1da177e4 | 2078 | { |
1bc3c9e1 JJ |
2079 | if (gb) { |
2080 | kfree(gb->buf_buf); | |
1da177e4 LT |
2081 | kfree(gb); |
2082 | } | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * gs_buf_clear | |
2087 | * | |
2088 | * Clear out all data in the circular buffer. | |
2089 | */ | |
b29dbbd8 | 2090 | static void gs_buf_clear(struct gs_buf *gb) |
1da177e4 LT |
2091 | { |
2092 | if (gb != NULL) | |
2093 | gb->buf_get = gb->buf_put; | |
2094 | /* equivalent to a get of all data available */ | |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * gs_buf_data_avail | |
2099 | * | |
2100 | * Return the number of bytes of data available in the circular | |
2101 | * buffer. | |
2102 | */ | |
b29dbbd8 | 2103 | static unsigned int gs_buf_data_avail(struct gs_buf *gb) |
1da177e4 LT |
2104 | { |
2105 | if (gb != NULL) | |
2106 | return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size; | |
2107 | else | |
2108 | return 0; | |
2109 | } | |
2110 | ||
2111 | /* | |
2112 | * gs_buf_space_avail | |
2113 | * | |
2114 | * Return the number of bytes of space available in the circular | |
2115 | * buffer. | |
2116 | */ | |
b29dbbd8 | 2117 | static unsigned int gs_buf_space_avail(struct gs_buf *gb) |
1da177e4 LT |
2118 | { |
2119 | if (gb != NULL) | |
2120 | return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size; | |
2121 | else | |
2122 | return 0; | |
2123 | } | |
2124 | ||
2125 | /* | |
2126 | * gs_buf_put | |
2127 | * | |
2128 | * Copy data data from a user buffer and put it into the circular buffer. | |
2129 | * Restrict to the amount of space available. | |
2130 | * | |
2131 | * Return the number of bytes copied. | |
2132 | */ | |
b29dbbd8 DB |
2133 | static unsigned int |
2134 | gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count) | |
1da177e4 LT |
2135 | { |
2136 | unsigned int len; | |
2137 | ||
2138 | if (gb == NULL) | |
2139 | return 0; | |
2140 | ||
2141 | len = gs_buf_space_avail(gb); | |
2142 | if (count > len) | |
2143 | count = len; | |
2144 | ||
2145 | if (count == 0) | |
2146 | return 0; | |
2147 | ||
2148 | len = gb->buf_buf + gb->buf_size - gb->buf_put; | |
2149 | if (count > len) { | |
2150 | memcpy(gb->buf_put, buf, len); | |
2151 | memcpy(gb->buf_buf, buf+len, count - len); | |
2152 | gb->buf_put = gb->buf_buf + count - len; | |
2153 | } else { | |
2154 | memcpy(gb->buf_put, buf, count); | |
2155 | if (count < len) | |
2156 | gb->buf_put += count; | |
2157 | else /* count == len */ | |
2158 | gb->buf_put = gb->buf_buf; | |
2159 | } | |
2160 | ||
2161 | return count; | |
2162 | } | |
2163 | ||
2164 | /* | |
2165 | * gs_buf_get | |
2166 | * | |
2167 | * Get data from the circular buffer and copy to the given buffer. | |
2168 | * Restrict to the amount of data available. | |
2169 | * | |
2170 | * Return the number of bytes copied. | |
2171 | */ | |
b29dbbd8 DB |
2172 | static unsigned int |
2173 | gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count) | |
1da177e4 LT |
2174 | { |
2175 | unsigned int len; | |
2176 | ||
2177 | if (gb == NULL) | |
2178 | return 0; | |
2179 | ||
2180 | len = gs_buf_data_avail(gb); | |
2181 | if (count > len) | |
2182 | count = len; | |
2183 | ||
2184 | if (count == 0) | |
2185 | return 0; | |
2186 | ||
2187 | len = gb->buf_buf + gb->buf_size - gb->buf_get; | |
2188 | if (count > len) { | |
2189 | memcpy(buf, gb->buf_get, len); | |
2190 | memcpy(buf+len, gb->buf_buf, count - len); | |
2191 | gb->buf_get = gb->buf_buf + count - len; | |
2192 | } else { | |
2193 | memcpy(buf, gb->buf_get, count); | |
2194 | if (count < len) | |
2195 | gb->buf_get += count; | |
2196 | else /* count == len */ | |
2197 | gb->buf_get = gb->buf_buf; | |
2198 | } | |
2199 | ||
2200 | return count; | |
2201 | } | |
9079e91b DB |
2202 | |
2203 | /*-------------------------------------------------------------------------*/ | |
2204 | ||
2205 | static struct tty_driver *gs_tty_driver; | |
2206 | ||
2207 | /* | |
2208 | * gs_module_init | |
2209 | * | |
2210 | * Register as a USB gadget driver and a tty driver. | |
2211 | */ | |
2212 | static int __init gs_module_init(void) | |
2213 | { | |
2214 | int i; | |
2215 | int retval; | |
2216 | ||
2217 | retval = usb_gadget_register_driver(&gs_gadget_driver); | |
2218 | if (retval) { | |
2219 | pr_err("gs_module_init: cannot register gadget driver, " | |
2220 | "ret=%d\n", retval); | |
2221 | return retval; | |
2222 | } | |
2223 | ||
2224 | gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS); | |
2225 | if (!gs_tty_driver) | |
2226 | return -ENOMEM; | |
2227 | gs_tty_driver->owner = THIS_MODULE; | |
2228 | gs_tty_driver->driver_name = GS_SHORT_NAME; | |
2229 | gs_tty_driver->name = "ttygs"; | |
2230 | gs_tty_driver->major = GS_MAJOR; | |
2231 | gs_tty_driver->minor_start = GS_MINOR_START; | |
2232 | gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
2233 | gs_tty_driver->subtype = SERIAL_TYPE_NORMAL; | |
2234 | gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
2235 | gs_tty_driver->init_termios = tty_std_termios; | |
2236 | /* must match GS_DEFAULT_DTE_RATE and friends */ | |
2237 | gs_tty_driver->init_termios.c_cflag = | |
2238 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
2239 | gs_tty_driver->init_termios.c_ispeed = GS_DEFAULT_DTE_RATE; | |
2240 | gs_tty_driver->init_termios.c_ospeed = GS_DEFAULT_DTE_RATE; | |
2241 | tty_set_operations(gs_tty_driver, &gs_tty_ops); | |
2242 | ||
2243 | for (i = 0; i < GS_NUM_PORTS; i++) | |
2244 | mutex_init(&gs_open_close_lock[i]); | |
2245 | ||
2246 | retval = tty_register_driver(gs_tty_driver); | |
2247 | if (retval) { | |
2248 | usb_gadget_unregister_driver(&gs_gadget_driver); | |
2249 | put_tty_driver(gs_tty_driver); | |
2250 | pr_err("gs_module_init: cannot register tty driver, " | |
2251 | "ret=%d\n", retval); | |
2252 | return retval; | |
2253 | } | |
2254 | ||
2255 | pr_info("gs_module_init: %s %s loaded\n", | |
2256 | GS_LONG_NAME, GS_VERSION_STR); | |
2257 | return 0; | |
2258 | } | |
2259 | module_init(gs_module_init); | |
2260 | ||
2261 | /* | |
2262 | * gs_module_exit | |
2263 | * | |
2264 | * Unregister as a tty driver and a USB gadget driver. | |
2265 | */ | |
2266 | static void __exit gs_module_exit(void) | |
2267 | { | |
2268 | tty_unregister_driver(gs_tty_driver); | |
2269 | put_tty_driver(gs_tty_driver); | |
2270 | usb_gadget_unregister_driver(&gs_gadget_driver); | |
2271 | ||
2272 | pr_info("gs_module_exit: %s %s unloaded\n", | |
2273 | GS_LONG_NAME, GS_VERSION_STR); | |
2274 | } | |
2275 | module_exit(gs_module_exit); |