Commit | Line | Data |
---|---|---|
99c3adb4 | 1 | /* |
1da177e4 LT |
2 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> |
3 | ||
4 | National Semiconductor SCx200 ACCESS.bus support | |
16ffc5c9 | 5 | Also supports the AMD CS5535 and AMD CS5536 |
99c3adb4 | 6 | |
1da177e4 LT |
7 | Based on i2c-keywest.c which is: |
8 | Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
9 | Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com> | |
99c3adb4 | 10 | |
1da177e4 LT |
11 | This program is free software; you can redistribute it and/or |
12 | modify it under the terms of the GNU General Public License as | |
13 | published by the Free Software Foundation; either version 2 of the | |
14 | License, or (at your option) any later version. | |
99c3adb4 | 15 | |
1da177e4 LT |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | General Public License for more details. | |
99c3adb4 | 20 | |
1da177e4 LT |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/i2c.h> | |
1da177e4 | 31 | #include <linux/pci.h> |
de8255cc | 32 | #include <linux/platform_device.h> |
1da177e4 | 33 | #include <linux/delay.h> |
3fb9a655 | 34 | #include <linux/mutex.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
21782180 | 36 | #include <linux/io.h> |
1da177e4 LT |
37 | |
38 | #include <linux/scx200.h> | |
39 | ||
40 | #define NAME "scx200_acb" | |
41 | ||
42 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); | |
43 | MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver"); | |
de8255cc | 44 | MODULE_ALIAS("platform:cs5535-smb"); |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
47 | #define MAX_DEVICES 4 | |
48 | static int base[MAX_DEVICES] = { 0x820, 0x840 }; | |
49 | module_param_array(base, int, NULL, 0); | |
50 | MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers"); | |
51 | ||
f933ff50 | 52 | #define POLL_TIMEOUT (HZ/5) |
1da177e4 LT |
53 | |
54 | enum scx200_acb_state { | |
55 | state_idle, | |
56 | state_address, | |
57 | state_command, | |
58 | state_repeat_start, | |
59 | state_quick, | |
60 | state_read, | |
61 | state_write, | |
62 | }; | |
63 | ||
64 | static const char *scx200_acb_state_name[] = { | |
65 | "idle", | |
66 | "address", | |
67 | "command", | |
68 | "repeat_start", | |
69 | "quick", | |
70 | "read", | |
71 | "write", | |
72 | }; | |
73 | ||
74 | /* Physical interface */ | |
99c3adb4 | 75 | struct scx200_acb_iface { |
1da177e4 LT |
76 | struct scx200_acb_iface *next; |
77 | struct i2c_adapter adapter; | |
78 | unsigned base; | |
3fb9a655 | 79 | struct mutex mutex; |
1da177e4 LT |
80 | |
81 | /* State machine data */ | |
82 | enum scx200_acb_state state; | |
83 | int result; | |
84 | u8 address_byte; | |
85 | u8 command; | |
86 | u8 *ptr; | |
87 | char needs_reset; | |
88 | unsigned len; | |
89 | }; | |
90 | ||
91 | /* Register Definitions */ | |
92 | #define ACBSDA (iface->base + 0) | |
93 | #define ACBST (iface->base + 1) | |
94 | #define ACBST_SDAST 0x40 /* SDA Status */ | |
99c3adb4 | 95 | #define ACBST_BER 0x20 |
1da177e4 LT |
96 | #define ACBST_NEGACK 0x10 /* Negative Acknowledge */ |
97 | #define ACBST_STASTR 0x08 /* Stall After Start */ | |
98 | #define ACBST_MASTER 0x02 | |
99 | #define ACBCST (iface->base + 2) | |
100 | #define ACBCST_BB 0x02 | |
101 | #define ACBCTL1 (iface->base + 3) | |
102 | #define ACBCTL1_STASTRE 0x80 | |
103 | #define ACBCTL1_NMINTE 0x40 | |
99c3adb4 BG |
104 | #define ACBCTL1_ACK 0x10 |
105 | #define ACBCTL1_STOP 0x02 | |
106 | #define ACBCTL1_START 0x01 | |
1da177e4 LT |
107 | #define ACBADDR (iface->base + 4) |
108 | #define ACBCTL2 (iface->base + 5) | |
109 | #define ACBCTL2_ENABLE 0x01 | |
110 | ||
111 | /************************************************************************/ | |
112 | ||
113 | static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) | |
114 | { | |
115 | const char *errmsg; | |
116 | ||
ef4d9275 BG |
117 | dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n", |
118 | scx200_acb_state_name[iface->state], status); | |
1da177e4 LT |
119 | |
120 | if (status & ACBST_BER) { | |
121 | errmsg = "bus error"; | |
122 | goto error; | |
123 | } | |
124 | if (!(status & ACBST_MASTER)) { | |
125 | errmsg = "not master"; | |
126 | goto error; | |
127 | } | |
9b7b6d3b BG |
128 | if (status & ACBST_NEGACK) { |
129 | dev_dbg(&iface->adapter.dev, "negative ack in state %s\n", | |
130 | scx200_acb_state_name[iface->state]); | |
131 | ||
132 | iface->state = state_idle; | |
133 | iface->result = -ENXIO; | |
134 | ||
135 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
136 | outb(ACBST_STASTR | ACBST_NEGACK, ACBST); | |
95563d34 JC |
137 | |
138 | /* Reset the status register */ | |
139 | outb(0, ACBST); | |
9b7b6d3b BG |
140 | return; |
141 | } | |
1da177e4 LT |
142 | |
143 | switch (iface->state) { | |
144 | case state_idle: | |
145 | dev_warn(&iface->adapter.dev, "interrupt in idle state\n"); | |
146 | break; | |
147 | ||
148 | case state_address: | |
149 | /* Do a pointer write first */ | |
150 | outb(iface->address_byte & ~1, ACBSDA); | |
151 | ||
152 | iface->state = state_command; | |
153 | break; | |
154 | ||
155 | case state_command: | |
156 | outb(iface->command, ACBSDA); | |
157 | ||
158 | if (iface->address_byte & 1) | |
159 | iface->state = state_repeat_start; | |
160 | else | |
161 | iface->state = state_write; | |
162 | break; | |
163 | ||
164 | case state_repeat_start: | |
165 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); | |
166 | /* fallthrough */ | |
99c3adb4 | 167 | |
1da177e4 LT |
168 | case state_quick: |
169 | if (iface->address_byte & 1) { | |
99c3adb4 | 170 | if (iface->len == 1) |
1da177e4 LT |
171 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
172 | else | |
173 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); | |
174 | outb(iface->address_byte, ACBSDA); | |
175 | ||
176 | iface->state = state_read; | |
177 | } else { | |
178 | outb(iface->address_byte, ACBSDA); | |
179 | ||
180 | iface->state = state_write; | |
181 | } | |
182 | break; | |
183 | ||
184 | case state_read: | |
fd627a01 TA |
185 | /* Set ACK if _next_ byte will be the last one */ |
186 | if (iface->len == 2) | |
1da177e4 LT |
187 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
188 | else | |
189 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); | |
190 | ||
fd627a01 | 191 | if (iface->len == 1) { |
1da177e4 LT |
192 | iface->result = 0; |
193 | iface->state = state_idle; | |
194 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
195 | } | |
196 | ||
fd627a01 TA |
197 | *iface->ptr++ = inb(ACBSDA); |
198 | --iface->len; | |
199 | ||
1da177e4 LT |
200 | break; |
201 | ||
202 | case state_write: | |
203 | if (iface->len == 0) { | |
204 | iface->result = 0; | |
205 | iface->state = state_idle; | |
206 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
207 | break; | |
208 | } | |
99c3adb4 | 209 | |
1da177e4 LT |
210 | outb(*iface->ptr++, ACBSDA); |
211 | --iface->len; | |
99c3adb4 | 212 | |
1da177e4 LT |
213 | break; |
214 | } | |
215 | ||
216 | return; | |
217 | ||
1da177e4 | 218 | error: |
fce96f3e WT |
219 | dev_err(&iface->adapter.dev, |
220 | "%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg, | |
221 | scx200_acb_state_name[iface->state], iface->address_byte, | |
222 | iface->len, status); | |
1da177e4 LT |
223 | |
224 | iface->state = state_idle; | |
225 | iface->result = -EIO; | |
226 | iface->needs_reset = 1; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | static void scx200_acb_poll(struct scx200_acb_iface *iface) |
230 | { | |
9b7b6d3b | 231 | u8 status; |
1da177e4 LT |
232 | unsigned long timeout; |
233 | ||
234 | timeout = jiffies + POLL_TIMEOUT; | |
3e3183ba | 235 | while (1) { |
1da177e4 | 236 | status = inb(ACBST); |
95563d34 JC |
237 | |
238 | /* Reset the status register to avoid the hang */ | |
239 | outb(0, ACBST); | |
240 | ||
1da177e4 LT |
241 | if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) { |
242 | scx200_acb_machine(iface, status); | |
243 | return; | |
244 | } | |
3e3183ba DW |
245 | if (time_after(jiffies, timeout)) |
246 | break; | |
247 | cpu_relax(); | |
248 | cond_resched(); | |
1da177e4 LT |
249 | } |
250 | ||
9b7b6d3b BG |
251 | dev_err(&iface->adapter.dev, "timeout in state %s\n", |
252 | scx200_acb_state_name[iface->state]); | |
253 | ||
254 | iface->state = state_idle; | |
255 | iface->result = -EIO; | |
256 | iface->needs_reset = 1; | |
1da177e4 | 257 | } |
1da177e4 LT |
258 | |
259 | static void scx200_acb_reset(struct scx200_acb_iface *iface) | |
260 | { | |
261 | /* Disable the ACCESS.bus device and Configure the SCL | |
99c3adb4 | 262 | frequency: 16 clock cycles */ |
1da177e4 LT |
263 | outb(0x70, ACBCTL2); |
264 | /* Polling mode */ | |
265 | outb(0, ACBCTL1); | |
266 | /* Disable slave address */ | |
267 | outb(0, ACBADDR); | |
268 | /* Enable the ACCESS.bus device */ | |
269 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); | |
270 | /* Free STALL after START */ | |
271 | outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1); | |
272 | /* Send a STOP */ | |
273 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
274 | /* Clear BER, NEGACK and STASTR bits */ | |
275 | outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST); | |
276 | /* Clear BB bit */ | |
277 | outb(inb(ACBCST) | ACBCST_BB, ACBCST); | |
278 | } | |
279 | ||
280 | static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter, | |
99c3adb4 BG |
281 | u16 address, unsigned short flags, |
282 | char rw, u8 command, int size, | |
283 | union i2c_smbus_data *data) | |
1da177e4 LT |
284 | { |
285 | struct scx200_acb_iface *iface = i2c_get_adapdata(adapter); | |
286 | int len; | |
287 | u8 *buffer; | |
288 | u16 cur_word; | |
289 | int rc; | |
290 | ||
291 | switch (size) { | |
292 | case I2C_SMBUS_QUICK: | |
99c3adb4 BG |
293 | len = 0; |
294 | buffer = NULL; | |
295 | break; | |
296 | ||
1da177e4 | 297 | case I2C_SMBUS_BYTE: |
9b7b6d3b BG |
298 | len = 1; |
299 | buffer = rw ? &data->byte : &command; | |
99c3adb4 BG |
300 | break; |
301 | ||
1da177e4 | 302 | case I2C_SMBUS_BYTE_DATA: |
99c3adb4 BG |
303 | len = 1; |
304 | buffer = &data->byte; | |
305 | break; | |
306 | ||
1da177e4 LT |
307 | case I2C_SMBUS_WORD_DATA: |
308 | len = 2; | |
99c3adb4 BG |
309 | cur_word = cpu_to_le16(data->word); |
310 | buffer = (u8 *)&cur_word; | |
1da177e4 | 311 | break; |
99c3adb4 | 312 | |
c3efacaa | 313 | case I2C_SMBUS_I2C_BLOCK_DATA: |
99c3adb4 | 314 | len = data->block[0]; |
c3efacaa JD |
315 | if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) |
316 | return -EINVAL; | |
99c3adb4 | 317 | buffer = &data->block[1]; |
1da177e4 | 318 | break; |
99c3adb4 | 319 | |
1da177e4 | 320 | default: |
99c3adb4 | 321 | return -EINVAL; |
1da177e4 LT |
322 | } |
323 | ||
ef4d9275 BG |
324 | dev_dbg(&adapter->dev, |
325 | "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n", | |
326 | size, address, command, len, rw); | |
1da177e4 LT |
327 | |
328 | if (!len && rw == I2C_SMBUS_READ) { | |
ef4d9275 | 329 | dev_dbg(&adapter->dev, "zero length read\n"); |
1da177e4 LT |
330 | return -EINVAL; |
331 | } | |
332 | ||
3fb9a655 | 333 | mutex_lock(&iface->mutex); |
1da177e4 | 334 | |
9b7b6d3b | 335 | iface->address_byte = (address << 1) | rw; |
1da177e4 LT |
336 | iface->command = command; |
337 | iface->ptr = buffer; | |
338 | iface->len = len; | |
339 | iface->result = -EINVAL; | |
340 | iface->needs_reset = 0; | |
341 | ||
342 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); | |
343 | ||
344 | if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) | |
345 | iface->state = state_quick; | |
346 | else | |
347 | iface->state = state_address; | |
348 | ||
1da177e4 LT |
349 | while (iface->state != state_idle) |
350 | scx200_acb_poll(iface); | |
1da177e4 LT |
351 | |
352 | if (iface->needs_reset) | |
353 | scx200_acb_reset(iface); | |
354 | ||
355 | rc = iface->result; | |
356 | ||
3fb9a655 | 357 | mutex_unlock(&iface->mutex); |
1da177e4 LT |
358 | |
359 | if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ) | |
99c3adb4 | 360 | data->word = le16_to_cpu(cur_word); |
1da177e4 LT |
361 | |
362 | #ifdef DEBUG | |
ef4d9275 | 363 | dev_dbg(&adapter->dev, "transfer done, result: %d", rc); |
1da177e4 LT |
364 | if (buffer) { |
365 | int i; | |
366 | printk(" data:"); | |
367 | for (i = 0; i < len; ++i) | |
368 | printk(" %02x", buffer[i]); | |
369 | } | |
370 | printk("\n"); | |
371 | #endif | |
372 | ||
373 | return rc; | |
374 | } | |
375 | ||
376 | static u32 scx200_acb_func(struct i2c_adapter *adapter) | |
377 | { | |
378 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
379 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
c3efacaa | 380 | I2C_FUNC_SMBUS_I2C_BLOCK; |
1da177e4 LT |
381 | } |
382 | ||
383 | /* For now, we only handle combined mode (smbus) */ | |
8f9082c5 | 384 | static const struct i2c_algorithm scx200_acb_algorithm = { |
1da177e4 LT |
385 | .smbus_xfer = scx200_acb_smbus_xfer, |
386 | .functionality = scx200_acb_func, | |
387 | }; | |
388 | ||
389 | static struct scx200_acb_iface *scx200_acb_list; | |
9d9c01ce | 390 | static DEFINE_MUTEX(scx200_acb_list_mutex); |
1da177e4 | 391 | |
de8255cc | 392 | static __devinit int scx200_acb_probe(struct scx200_acb_iface *iface) |
1da177e4 LT |
393 | { |
394 | u8 val; | |
395 | ||
396 | /* Disable the ACCESS.bus device and Configure the SCL | |
99c3adb4 | 397 | frequency: 16 clock cycles */ |
1da177e4 LT |
398 | outb(0x70, ACBCTL2); |
399 | ||
400 | if (inb(ACBCTL2) != 0x70) { | |
ef4d9275 | 401 | pr_debug(NAME ": ACBCTL2 readback failed\n"); |
1da177e4 LT |
402 | return -ENXIO; |
403 | } | |
404 | ||
405 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); | |
406 | ||
407 | val = inb(ACBCTL1); | |
408 | if (val) { | |
ef4d9275 BG |
409 | pr_debug(NAME ": disabled, but ACBCTL1=0x%02x\n", |
410 | val); | |
1da177e4 LT |
411 | return -ENXIO; |
412 | } | |
413 | ||
414 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); | |
415 | ||
416 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); | |
417 | ||
418 | val = inb(ACBCTL1); | |
419 | if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) { | |
ef4d9275 BG |
420 | pr_debug(NAME ": enabled, but NMINTE won't be set, " |
421 | "ACBCTL1=0x%02x\n", val); | |
1da177e4 LT |
422 | return -ENXIO; |
423 | } | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
de8255cc | 428 | static __devinit struct scx200_acb_iface *scx200_create_iface(const char *text, |
12a917f6 | 429 | struct device *dev, int index) |
1da177e4 LT |
430 | { |
431 | struct scx200_acb_iface *iface; | |
432 | struct i2c_adapter *adapter; | |
1da177e4 | 433 | |
5263ebb5 | 434 | iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
435 | if (!iface) { |
436 | printk(KERN_ERR NAME ": can't allocate memory\n"); | |
80cd3a87 | 437 | return NULL; |
1da177e4 LT |
438 | } |
439 | ||
1da177e4 LT |
440 | adapter = &iface->adapter; |
441 | i2c_set_adapdata(adapter, iface); | |
2096b956 | 442 | snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index); |
1da177e4 | 443 | adapter->owner = THIS_MODULE; |
1da177e4 | 444 | adapter->algo = &scx200_acb_algorithm; |
3401b2ff | 445 | adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; |
12a917f6 | 446 | adapter->dev.parent = dev; |
1da177e4 | 447 | |
3fb9a655 | 448 | mutex_init(&iface->mutex); |
1da177e4 | 449 | |
80cd3a87 JC |
450 | return iface; |
451 | } | |
452 | ||
de8255cc | 453 | static int __devinit scx200_acb_create(struct scx200_acb_iface *iface) |
80cd3a87 JC |
454 | { |
455 | struct i2c_adapter *adapter; | |
456 | int rc; | |
457 | ||
458 | adapter = &iface->adapter; | |
1da177e4 LT |
459 | |
460 | rc = scx200_acb_probe(iface); | |
461 | if (rc) { | |
ef4d9275 | 462 | printk(KERN_WARNING NAME ": probe failed\n"); |
80cd3a87 | 463 | return rc; |
1da177e4 LT |
464 | } |
465 | ||
466 | scx200_acb_reset(iface); | |
467 | ||
468 | if (i2c_add_adapter(adapter) < 0) { | |
ef4d9275 | 469 | printk(KERN_ERR NAME ": failed to register\n"); |
80cd3a87 | 470 | return -ENODEV; |
1da177e4 LT |
471 | } |
472 | ||
de8255cc AS |
473 | if (!adapter->dev.parent) { |
474 | /* If there's no dev, we're tracking (ISA) ifaces manually */ | |
475 | mutex_lock(&scx200_acb_list_mutex); | |
476 | iface->next = scx200_acb_list; | |
477 | scx200_acb_list = iface; | |
478 | mutex_unlock(&scx200_acb_list_mutex); | |
479 | } | |
1da177e4 LT |
480 | |
481 | return 0; | |
80cd3a87 | 482 | } |
1da177e4 | 483 | |
de8255cc AS |
484 | static struct scx200_acb_iface * __devinit scx200_create_dev(const char *text, |
485 | unsigned long base, int index, struct device *dev) | |
80cd3a87 JC |
486 | { |
487 | struct scx200_acb_iface *iface; | |
488 | int rc; | |
489 | ||
de8255cc | 490 | iface = scx200_create_iface(text, dev, index); |
80cd3a87 JC |
491 | |
492 | if (iface == NULL) | |
de8255cc | 493 | return NULL; |
80cd3a87 | 494 | |
de8255cc AS |
495 | if (!request_region(base, 8, iface->adapter.name)) { |
496 | printk(KERN_ERR NAME ": can't allocate io 0x%lx-0x%lx\n", | |
497 | base, base + 8 - 1); | |
80cd3a87 JC |
498 | goto errout_free; |
499 | } | |
500 | ||
de8255cc | 501 | iface->base = base; |
80cd3a87 JC |
502 | rc = scx200_acb_create(iface); |
503 | ||
504 | if (rc == 0) | |
de8255cc | 505 | return iface; |
80cd3a87 | 506 | |
de8255cc | 507 | release_region(base, 8); |
9b7b6d3b BG |
508 | errout_free: |
509 | kfree(iface); | |
de8255cc | 510 | return NULL; |
1da177e4 LT |
511 | } |
512 | ||
de8255cc | 513 | static int __devinit scx200_probe(struct platform_device *pdev) |
80cd3a87 JC |
514 | { |
515 | struct scx200_acb_iface *iface; | |
de8255cc | 516 | struct resource *res; |
80cd3a87 | 517 | |
de8255cc AS |
518 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
519 | if (!res) { | |
520 | dev_err(&pdev->dev, "can't fetch device resource info\n"); | |
521 | return -ENODEV; | |
80cd3a87 JC |
522 | } |
523 | ||
de8255cc AS |
524 | iface = scx200_create_dev("CS5535", res->start, 0, &pdev->dev); |
525 | if (!iface) | |
526 | return -EIO; | |
80cd3a87 | 527 | |
de8255cc AS |
528 | dev_info(&pdev->dev, "SCx200 device '%s' registered\n", |
529 | iface->adapter.name); | |
530 | platform_set_drvdata(pdev, iface); | |
1da177e4 | 531 | |
de8255cc | 532 | return 0; |
80cd3a87 JC |
533 | } |
534 | ||
de8255cc AS |
535 | static void __devexit scx200_cleanup_iface(struct scx200_acb_iface *iface) |
536 | { | |
537 | i2c_del_adapter(&iface->adapter); | |
538 | release_region(iface->base, 8); | |
539 | kfree(iface); | |
540 | } | |
16ffc5c9 | 541 | |
de8255cc | 542 | static int __devexit scx200_remove(struct platform_device *pdev) |
16ffc5c9 | 543 | { |
de8255cc | 544 | struct scx200_acb_iface *iface; |
80cd3a87 | 545 | |
de8255cc AS |
546 | iface = platform_get_drvdata(pdev); |
547 | platform_set_drvdata(pdev, NULL); | |
548 | scx200_cleanup_iface(iface); | |
80cd3a87 | 549 | |
de8255cc AS |
550 | return 0; |
551 | } | |
80cd3a87 | 552 | |
6fcf84a2 | 553 | static struct platform_driver scx200_pci_driver = { |
de8255cc AS |
554 | .driver = { |
555 | .name = "cs5535-smb", | |
556 | .owner = THIS_MODULE, | |
557 | }, | |
558 | .probe = scx200_probe, | |
559 | .remove = __devexit_p(scx200_remove), | |
560 | }; | |
80cd3a87 | 561 | |
3527bd50 | 562 | static DEFINE_PCI_DEVICE_TABLE(scx200_isa) = { |
de8255cc AS |
563 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, |
564 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, | |
565 | { 0, } | |
566 | }; | |
80cd3a87 | 567 | |
de8255cc AS |
568 | static __init void scx200_scan_isa(void) |
569 | { | |
570 | int i; | |
80cd3a87 | 571 | |
de8255cc AS |
572 | if (!pci_dev_present(scx200_isa)) |
573 | return; | |
80cd3a87 | 574 | |
de8255cc AS |
575 | for (i = 0; i < MAX_DEVICES; ++i) { |
576 | if (base[i] == 0) | |
577 | continue; | |
16ffc5c9 | 578 | |
de8255cc AS |
579 | /* XXX: should we care about failures? */ |
580 | scx200_create_dev("SCx200", base[i], i, NULL); | |
16ffc5c9 | 581 | } |
16ffc5c9 BG |
582 | } |
583 | ||
1da177e4 LT |
584 | static int __init scx200_acb_init(void) |
585 | { | |
1da177e4 LT |
586 | pr_debug(NAME ": NatSemi SCx200 ACCESS.bus Driver\n"); |
587 | ||
de8255cc AS |
588 | /* First scan for ISA-based devices */ |
589 | scx200_scan_isa(); /* XXX: should we care about errors? */ | |
1da177e4 | 590 | |
6f9c2963 JD |
591 | /* If at least one bus was created, init must succeed */ |
592 | if (scx200_acb_list) | |
593 | return 0; | |
de8255cc AS |
594 | |
595 | /* No ISA devices; register the platform driver for PCI-based devices */ | |
6fcf84a2 | 596 | return platform_driver_register(&scx200_pci_driver); |
1da177e4 LT |
597 | } |
598 | ||
599 | static void __exit scx200_acb_cleanup(void) | |
600 | { | |
601 | struct scx200_acb_iface *iface; | |
99c3adb4 | 602 | |
6fcf84a2 | 603 | platform_driver_unregister(&scx200_pci_driver); |
de8255cc | 604 | |
9d9c01ce | 605 | mutex_lock(&scx200_acb_list_mutex); |
1da177e4 LT |
606 | while ((iface = scx200_acb_list) != NULL) { |
607 | scx200_acb_list = iface->next; | |
9d9c01ce | 608 | mutex_unlock(&scx200_acb_list_mutex); |
1da177e4 | 609 | |
de8255cc | 610 | scx200_cleanup_iface(iface); |
80cd3a87 | 611 | |
9d9c01ce | 612 | mutex_lock(&scx200_acb_list_mutex); |
1da177e4 | 613 | } |
9d9c01ce | 614 | mutex_unlock(&scx200_acb_list_mutex); |
1da177e4 LT |
615 | } |
616 | ||
617 | module_init(scx200_acb_init); | |
618 | module_exit(scx200_acb_cleanup); |