Commit | Line | Data |
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28ff2f7a | 1 | /*************************************************************************** |
312869ec | 2 | * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> * |
28ff2f7a HG |
3 | * * |
4 | * This program is free software; you can redistribute it and/or modify * | |
5 | * it under the terms of the GNU General Public License as published by * | |
6 | * the Free Software Foundation; either version 2 of the License, or * | |
7 | * (at your option) any later version. * | |
8 | * * | |
9 | * This program is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU General Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU General Public License * | |
15 | * along with this program; if not, write to the * | |
16 | * Free Software Foundation, Inc., * | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
18 | ***************************************************************************/ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/acpi.h> | |
28 | #include <linux/delay.h> | |
312869ec HG |
29 | #include <linux/fs.h> |
30 | #include <linux/watchdog.h> | |
31 | #include <linux/miscdevice.h> | |
32 | #include <linux/uaccess.h> | |
33 | #include <linux/kref.h> | |
34 | #include <linux/slab.h> | |
28ff2f7a HG |
35 | #include "sch56xx-common.h" |
36 | ||
312869ec HG |
37 | /* Insmod parameters */ |
38 | static int nowayout = WATCHDOG_NOWAYOUT; | |
39 | module_param(nowayout, int, 0); | |
40 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" | |
41 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
42 | ||
28ff2f7a HG |
43 | #define SIO_SCH56XX_LD_EM 0x0C /* Embedded uController Logical Dev */ |
44 | #define SIO_UNLOCK_KEY 0x55 /* Key to enable Super-I/O */ | |
45 | #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ | |
46 | ||
47 | #define SIO_REG_LDSEL 0x07 /* Logical device select */ | |
48 | #define SIO_REG_DEVID 0x20 /* Device ID */ | |
49 | #define SIO_REG_ENABLE 0x30 /* Logical device enable */ | |
50 | #define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */ | |
51 | ||
52 | #define SIO_SCH5627_ID 0xC6 /* Chipset ID */ | |
0772a640 | 53 | #define SIO_SCH5636_ID 0xC7 /* Chipset ID */ |
28ff2f7a | 54 | |
312869ec | 55 | #define REGION_LENGTH 10 |
28ff2f7a HG |
56 | |
57 | #define SCH56XX_CMD_READ 0x02 | |
58 | #define SCH56XX_CMD_WRITE 0x03 | |
59 | ||
312869ec HG |
60 | /* Watchdog registers */ |
61 | #define SCH56XX_REG_WDOG_PRESET 0x58B | |
62 | #define SCH56XX_REG_WDOG_CONTROL 0x58C | |
63 | #define SCH56XX_WDOG_TIME_BASE_SEC 0x01 | |
64 | #define SCH56XX_REG_WDOG_OUTPUT_ENABLE 0x58E | |
65 | #define SCH56XX_WDOG_OUTPUT_ENABLE 0x02 | |
66 | ||
67 | struct sch56xx_watchdog_data { | |
68 | u16 addr; | |
312869ec | 69 | struct mutex *io_lock; |
54e2dc93 | 70 | struct kref kref; |
fb551405 HG |
71 | struct watchdog_info wdinfo; |
72 | struct watchdog_device wddev; | |
312869ec HG |
73 | u8 watchdog_preset; |
74 | u8 watchdog_control; | |
75 | u8 watchdog_output_enable; | |
76 | }; | |
77 | ||
28ff2f7a HG |
78 | static struct platform_device *sch56xx_pdev; |
79 | ||
80 | /* Super I/O functions */ | |
81 | static inline int superio_inb(int base, int reg) | |
82 | { | |
83 | outb(reg, base); | |
84 | return inb(base + 1); | |
85 | } | |
86 | ||
87 | static inline int superio_enter(int base) | |
88 | { | |
89 | /* Don't step on other drivers' I/O space by accident */ | |
90 | if (!request_muxed_region(base, 2, "sch56xx")) { | |
91 | pr_err("I/O address 0x%04x already in use\n", base); | |
92 | return -EBUSY; | |
93 | } | |
94 | ||
95 | outb(SIO_UNLOCK_KEY, base); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static inline void superio_select(int base, int ld) | |
101 | { | |
102 | outb(SIO_REG_LDSEL, base); | |
103 | outb(ld, base + 1); | |
104 | } | |
105 | ||
106 | static inline void superio_exit(int base) | |
107 | { | |
108 | outb(SIO_LOCK_KEY, base); | |
109 | release_region(base, 2); | |
110 | } | |
111 | ||
112 | static int sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v) | |
113 | { | |
114 | u8 val; | |
115 | int i; | |
116 | /* | |
117 | * According to SMSC for the commands we use the maximum time for | |
118 | * the EM to respond is 15 ms, but testing shows in practice it | |
119 | * responds within 15-32 reads, so we first busy poll, and if | |
120 | * that fails sleep a bit and try again until we are way past | |
121 | * the 15 ms maximum response time. | |
122 | */ | |
123 | const int max_busy_polls = 64; | |
124 | const int max_lazy_polls = 32; | |
125 | ||
126 | /* (Optional) Write-Clear the EC to Host Mailbox Register */ | |
127 | val = inb(addr + 1); | |
128 | outb(val, addr + 1); | |
129 | ||
130 | /* Set Mailbox Address Pointer to first location in Region 1 */ | |
131 | outb(0x00, addr + 2); | |
132 | outb(0x80, addr + 3); | |
133 | ||
134 | /* Write Request Packet Header */ | |
135 | outb(cmd, addr + 4); /* VREG Access Type read:0x02 write:0x03 */ | |
136 | outb(0x01, addr + 5); /* # of Entries: 1 Byte (8-bit) */ | |
137 | outb(0x04, addr + 2); /* Mailbox AP to first data entry loc. */ | |
138 | ||
139 | /* Write Value field */ | |
140 | if (cmd == SCH56XX_CMD_WRITE) | |
141 | outb(v, addr + 4); | |
142 | ||
143 | /* Write Address field */ | |
144 | outb(reg & 0xff, addr + 6); | |
145 | outb(reg >> 8, addr + 7); | |
146 | ||
147 | /* Execute the Random Access Command */ | |
148 | outb(0x01, addr); /* Write 01h to the Host-to-EC register */ | |
149 | ||
150 | /* EM Interface Polling "Algorithm" */ | |
151 | for (i = 0; i < max_busy_polls + max_lazy_polls; i++) { | |
152 | if (i >= max_busy_polls) | |
153 | msleep(1); | |
154 | /* Read Interrupt source Register */ | |
155 | val = inb(addr + 8); | |
156 | /* Write Clear the interrupt source bits */ | |
157 | if (val) | |
158 | outb(val, addr + 8); | |
159 | /* Command Completed ? */ | |
160 | if (val & 0x01) | |
161 | break; | |
162 | } | |
163 | if (i == max_busy_polls + max_lazy_polls) { | |
b55f3757 GR |
164 | pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)\n", |
165 | reg, 1); | |
28ff2f7a HG |
166 | return -EIO; |
167 | } | |
168 | ||
169 | /* | |
170 | * According to SMSC we may need to retry this, but sofar I've always | |
171 | * seen this succeed in 1 try. | |
172 | */ | |
173 | for (i = 0; i < max_busy_polls; i++) { | |
174 | /* Read EC-to-Host Register */ | |
175 | val = inb(addr + 1); | |
176 | /* Command Completed ? */ | |
177 | if (val == 0x01) | |
178 | break; | |
179 | ||
180 | if (i == 0) | |
b55f3757 GR |
181 | pr_warn("EC reports: 0x%02x reading virtual register 0x%04hx\n", |
182 | (unsigned int)val, reg); | |
28ff2f7a HG |
183 | } |
184 | if (i == max_busy_polls) { | |
b55f3757 GR |
185 | pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)\n", |
186 | reg, 2); | |
28ff2f7a HG |
187 | return -EIO; |
188 | } | |
189 | ||
190 | /* | |
191 | * According to the SMSC app note we should now do: | |
192 | * | |
193 | * Set Mailbox Address Pointer to first location in Region 1 * | |
194 | * outb(0x00, addr + 2); | |
195 | * outb(0x80, addr + 3); | |
196 | * | |
197 | * But if we do that things don't work, so let's not. | |
198 | */ | |
199 | ||
200 | /* Read Value field */ | |
201 | if (cmd == SCH56XX_CMD_READ) | |
202 | return inb(addr + 4); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | int sch56xx_read_virtual_reg(u16 addr, u16 reg) | |
208 | { | |
209 | return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0); | |
210 | } | |
211 | EXPORT_SYMBOL(sch56xx_read_virtual_reg); | |
212 | ||
213 | int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val) | |
214 | { | |
215 | return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val); | |
216 | } | |
217 | EXPORT_SYMBOL(sch56xx_write_virtual_reg); | |
218 | ||
219 | int sch56xx_read_virtual_reg16(u16 addr, u16 reg) | |
220 | { | |
221 | int lsb, msb; | |
222 | ||
223 | /* Read LSB first, this will cause the matching MSB to be latched */ | |
224 | lsb = sch56xx_read_virtual_reg(addr, reg); | |
225 | if (lsb < 0) | |
226 | return lsb; | |
227 | ||
228 | msb = sch56xx_read_virtual_reg(addr, reg + 1); | |
229 | if (msb < 0) | |
230 | return msb; | |
231 | ||
232 | return lsb | (msb << 8); | |
233 | } | |
234 | EXPORT_SYMBOL(sch56xx_read_virtual_reg16); | |
235 | ||
236 | int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg, | |
237 | int high_nibble) | |
238 | { | |
239 | int msb, lsn; | |
240 | ||
241 | /* Read MSB first, this will cause the matching LSN to be latched */ | |
242 | msb = sch56xx_read_virtual_reg(addr, msb_reg); | |
243 | if (msb < 0) | |
244 | return msb; | |
245 | ||
246 | lsn = sch56xx_read_virtual_reg(addr, lsn_reg); | |
247 | if (lsn < 0) | |
248 | return lsn; | |
249 | ||
250 | if (high_nibble) | |
251 | return (msb << 4) | (lsn >> 4); | |
252 | else | |
253 | return (msb << 4) | (lsn & 0x0f); | |
254 | } | |
255 | EXPORT_SYMBOL(sch56xx_read_virtual_reg12); | |
256 | ||
312869ec HG |
257 | /* |
258 | * Watchdog routines | |
259 | */ | |
260 | ||
54e2dc93 HG |
261 | /* Release our data struct when we're unregistered *and* |
262 | all references to our watchdog device are released */ | |
263 | static void watchdog_release_resources(struct kref *r) | |
264 | { | |
265 | struct sch56xx_watchdog_data *data = | |
266 | container_of(r, struct sch56xx_watchdog_data, kref); | |
267 | kfree(data); | |
268 | } | |
269 | ||
fb551405 HG |
270 | static int watchdog_set_timeout(struct watchdog_device *wddev, |
271 | unsigned int timeout) | |
312869ec | 272 | { |
fb551405 HG |
273 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); |
274 | unsigned int resolution; | |
312869ec | 275 | u8 control; |
fb551405 | 276 | int ret; |
312869ec HG |
277 | |
278 | /* 1 second or 60 second resolution? */ | |
279 | if (timeout <= 255) | |
280 | resolution = 1; | |
281 | else | |
282 | resolution = 60; | |
283 | ||
284 | if (timeout < resolution || timeout > (resolution * 255)) | |
285 | return -EINVAL; | |
286 | ||
312869ec HG |
287 | if (resolution == 1) |
288 | control = data->watchdog_control | SCH56XX_WDOG_TIME_BASE_SEC; | |
289 | else | |
290 | control = data->watchdog_control & ~SCH56XX_WDOG_TIME_BASE_SEC; | |
291 | ||
292 | if (data->watchdog_control != control) { | |
293 | mutex_lock(data->io_lock); | |
294 | ret = sch56xx_write_virtual_reg(data->addr, | |
295 | SCH56XX_REG_WDOG_CONTROL, | |
296 | control); | |
297 | mutex_unlock(data->io_lock); | |
298 | if (ret) | |
fb551405 | 299 | return ret; |
312869ec HG |
300 | |
301 | data->watchdog_control = control; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Remember new timeout value, but do not write as that (re)starts | |
306 | * the watchdog countdown. | |
307 | */ | |
308 | data->watchdog_preset = DIV_ROUND_UP(timeout, resolution); | |
fb551405 | 309 | wddev->timeout = data->watchdog_preset * resolution; |
312869ec | 310 | |
fb551405 | 311 | return 0; |
312869ec HG |
312 | } |
313 | ||
fb551405 | 314 | static int watchdog_start(struct watchdog_device *wddev) |
312869ec | 315 | { |
fb551405 | 316 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); |
312869ec HG |
317 | int ret; |
318 | u8 val; | |
319 | ||
312869ec HG |
320 | /* |
321 | * The sch56xx's watchdog cannot really be started / stopped | |
322 | * it is always running, but we can avoid the timer expiring | |
323 | * from causing a system reset by clearing the output enable bit. | |
324 | * | |
325 | * The sch56xx's watchdog will set the watchdog event bit, bit 0 | |
326 | * of the second interrupt source register (at base-address + 9), | |
327 | * when the timer expires. | |
328 | * | |
329 | * This will only cause a system reset if the 0-1 flank happens when | |
330 | * output enable is true. Setting output enable after the flank will | |
331 | * not cause a reset, nor will the timer expiring a second time. | |
332 | * This means we must clear the watchdog event bit in case it is set. | |
333 | * | |
334 | * The timer may still be running (after a recent watchdog_stop) and | |
335 | * mere milliseconds away from expiring, so the timer must be reset | |
336 | * first! | |
337 | */ | |
338 | ||
339 | mutex_lock(data->io_lock); | |
340 | ||
341 | /* 1. Reset the watchdog countdown counter */ | |
342 | ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET, | |
343 | data->watchdog_preset); | |
344 | if (ret) | |
345 | goto leave; | |
346 | ||
85a2e40c HG |
347 | /* 2. Enable output */ |
348 | val = data->watchdog_output_enable | SCH56XX_WDOG_OUTPUT_ENABLE; | |
349 | ret = sch56xx_write_virtual_reg(data->addr, | |
350 | SCH56XX_REG_WDOG_OUTPUT_ENABLE, val); | |
351 | if (ret) | |
352 | goto leave; | |
312869ec | 353 | |
85a2e40c | 354 | data->watchdog_output_enable = val; |
312869ec HG |
355 | |
356 | /* 3. Clear the watchdog event bit if set */ | |
357 | val = inb(data->addr + 9); | |
358 | if (val & 0x01) | |
359 | outb(0x01, data->addr + 9); | |
360 | ||
361 | leave: | |
362 | mutex_unlock(data->io_lock); | |
312869ec HG |
363 | return ret; |
364 | } | |
365 | ||
fb551405 | 366 | static int watchdog_trigger(struct watchdog_device *wddev) |
312869ec | 367 | { |
fb551405 | 368 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); |
312869ec HG |
369 | int ret; |
370 | ||
312869ec HG |
371 | /* Reset the watchdog countdown counter */ |
372 | mutex_lock(data->io_lock); | |
373 | ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET, | |
374 | data->watchdog_preset); | |
375 | mutex_unlock(data->io_lock); | |
fb551405 | 376 | |
312869ec HG |
377 | return ret; |
378 | } | |
379 | ||
fb551405 | 380 | static int watchdog_stop(struct watchdog_device *wddev) |
312869ec | 381 | { |
fb551405 | 382 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); |
312869ec HG |
383 | int ret = 0; |
384 | u8 val; | |
385 | ||
85a2e40c HG |
386 | val = data->watchdog_output_enable & ~SCH56XX_WDOG_OUTPUT_ENABLE; |
387 | mutex_lock(data->io_lock); | |
388 | ret = sch56xx_write_virtual_reg(data->addr, | |
389 | SCH56XX_REG_WDOG_OUTPUT_ENABLE, val); | |
390 | mutex_unlock(data->io_lock); | |
391 | if (ret) | |
392 | return ret; | |
312869ec | 393 | |
85a2e40c HG |
394 | data->watchdog_output_enable = val; |
395 | return 0; | |
312869ec HG |
396 | } |
397 | ||
54e2dc93 HG |
398 | static void watchdog_ref(struct watchdog_device *wddev) |
399 | { | |
400 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); | |
401 | ||
402 | kref_get(&data->kref); | |
403 | } | |
404 | ||
405 | static void watchdog_unref(struct watchdog_device *wddev) | |
406 | { | |
407 | struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev); | |
408 | ||
409 | kref_put(&data->kref, watchdog_release_resources); | |
410 | } | |
411 | ||
fb551405 HG |
412 | static const struct watchdog_ops watchdog_ops = { |
413 | .owner = THIS_MODULE, | |
414 | .start = watchdog_start, | |
415 | .stop = watchdog_stop, | |
416 | .ping = watchdog_trigger, | |
417 | .set_timeout = watchdog_set_timeout, | |
54e2dc93 HG |
418 | .ref = watchdog_ref, |
419 | .unref = watchdog_unref, | |
312869ec HG |
420 | }; |
421 | ||
fb551405 | 422 | struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent, |
312869ec HG |
423 | u16 addr, u32 revision, struct mutex *io_lock, int check_enabled) |
424 | { | |
425 | struct sch56xx_watchdog_data *data; | |
fb551405 | 426 | int err, control, output_enable; |
312869ec HG |
427 | |
428 | /* Cache the watchdog registers */ | |
429 | mutex_lock(io_lock); | |
430 | control = | |
431 | sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_CONTROL); | |
432 | output_enable = | |
433 | sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_OUTPUT_ENABLE); | |
434 | mutex_unlock(io_lock); | |
435 | ||
436 | if (control < 0) | |
437 | return NULL; | |
438 | if (output_enable < 0) | |
439 | return NULL; | |
440 | if (check_enabled && !(output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)) { | |
441 | pr_warn("Watchdog not enabled by BIOS, not registering\n"); | |
442 | return NULL; | |
443 | } | |
444 | ||
445 | data = kzalloc(sizeof(struct sch56xx_watchdog_data), GFP_KERNEL); | |
446 | if (!data) | |
447 | return NULL; | |
448 | ||
449 | data->addr = addr; | |
312869ec | 450 | data->io_lock = io_lock; |
54e2dc93 | 451 | kref_init(&data->kref); |
312869ec | 452 | |
fb551405 HG |
453 | strlcpy(data->wdinfo.identity, "sch56xx watchdog", |
454 | sizeof(data->wdinfo.identity)); | |
455 | data->wdinfo.firmware_version = revision; | |
456 | data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT; | |
457 | if (!nowayout) | |
458 | data->wdinfo.options |= WDIOF_MAGICCLOSE; | |
459 | ||
460 | data->wddev.info = &data->wdinfo; | |
461 | data->wddev.ops = &watchdog_ops; | |
462 | data->wddev.parent = parent; | |
463 | data->wddev.timeout = 60; | |
464 | data->wddev.min_timeout = 1; | |
465 | data->wddev.max_timeout = 255 * 60; | |
466 | if (nowayout) | |
bb644913 | 467 | set_bit(WDOG_NO_WAY_OUT, &data->wddev.status); |
fb551405 | 468 | if (output_enable & SCH56XX_WDOG_OUTPUT_ENABLE) |
bb644913 | 469 | set_bit(WDOG_ACTIVE, &data->wddev.status); |
fb551405 HG |
470 | |
471 | /* Since the watchdog uses a downcounter there is no register to read | |
472 | the BIOS set timeout from (if any was set at all) -> | |
473 | Choose a preset which will give us a 1 minute timeout */ | |
474 | if (control & SCH56XX_WDOG_TIME_BASE_SEC) | |
475 | data->watchdog_preset = 60; /* seconds */ | |
476 | else | |
477 | data->watchdog_preset = 1; /* minute */ | |
312869ec | 478 | |
fb551405 HG |
479 | data->watchdog_control = control; |
480 | data->watchdog_output_enable = output_enable; | |
312869ec | 481 | |
fb551405 HG |
482 | watchdog_set_drvdata(&data->wddev, data); |
483 | err = watchdog_register_device(&data->wddev); | |
312869ec HG |
484 | if (err) { |
485 | pr_err("Registering watchdog chardev: %d\n", err); | |
fb551405 HG |
486 | kfree(data); |
487 | return NULL; | |
312869ec HG |
488 | } |
489 | ||
490 | return data; | |
312869ec HG |
491 | } |
492 | EXPORT_SYMBOL(sch56xx_watchdog_register); | |
493 | ||
494 | void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data) | |
495 | { | |
fb551405 | 496 | watchdog_unregister_device(&data->wddev); |
54e2dc93 HG |
497 | kref_put(&data->kref, watchdog_release_resources); |
498 | /* Don't touch data after this it may have been free-ed! */ | |
312869ec HG |
499 | } |
500 | EXPORT_SYMBOL(sch56xx_watchdog_unregister); | |
501 | ||
502 | /* | |
503 | * platform dev find, add and remove functions | |
504 | */ | |
505 | ||
313829ee | 506 | static int __init sch56xx_find(int sioaddr, const char **name) |
28ff2f7a HG |
507 | { |
508 | u8 devid; | |
313829ee | 509 | unsigned short address; |
28ff2f7a HG |
510 | int err; |
511 | ||
512 | err = superio_enter(sioaddr); | |
513 | if (err) | |
514 | return err; | |
515 | ||
516 | devid = superio_inb(sioaddr, SIO_REG_DEVID); | |
517 | switch (devid) { | |
518 | case SIO_SCH5627_ID: | |
519 | *name = "sch5627"; | |
520 | break; | |
0772a640 HG |
521 | case SIO_SCH5636_ID: |
522 | *name = "sch5636"; | |
523 | break; | |
28ff2f7a HG |
524 | default: |
525 | pr_debug("Unsupported device id: 0x%02x\n", | |
526 | (unsigned int)devid); | |
527 | err = -ENODEV; | |
528 | goto exit; | |
529 | } | |
530 | ||
531 | superio_select(sioaddr, SIO_SCH56XX_LD_EM); | |
532 | ||
533 | if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) { | |
534 | pr_warn("Device not activated\n"); | |
535 | err = -ENODEV; | |
536 | goto exit; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Warning the order of the low / high byte is the other way around | |
541 | * as on most other superio devices!! | |
542 | */ | |
313829ee | 543 | address = superio_inb(sioaddr, SIO_REG_ADDR) | |
28ff2f7a | 544 | superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8; |
313829ee | 545 | if (address == 0) { |
28ff2f7a HG |
546 | pr_warn("Base address not set\n"); |
547 | err = -ENODEV; | |
548 | goto exit; | |
549 | } | |
313829ee | 550 | err = address; |
28ff2f7a HG |
551 | |
552 | exit: | |
553 | superio_exit(sioaddr); | |
554 | return err; | |
555 | } | |
556 | ||
313829ee | 557 | static int __init sch56xx_device_add(int address, const char *name) |
28ff2f7a HG |
558 | { |
559 | struct resource res = { | |
560 | .start = address, | |
561 | .end = address + REGION_LENGTH - 1, | |
562 | .flags = IORESOURCE_IO, | |
563 | }; | |
564 | int err; | |
565 | ||
566 | sch56xx_pdev = platform_device_alloc(name, address); | |
567 | if (!sch56xx_pdev) | |
568 | return -ENOMEM; | |
569 | ||
570 | res.name = sch56xx_pdev->name; | |
571 | err = acpi_check_resource_conflict(&res); | |
572 | if (err) | |
573 | goto exit_device_put; | |
574 | ||
575 | err = platform_device_add_resources(sch56xx_pdev, &res, 1); | |
576 | if (err) { | |
577 | pr_err("Device resource addition failed\n"); | |
578 | goto exit_device_put; | |
579 | } | |
580 | ||
581 | err = platform_device_add(sch56xx_pdev); | |
582 | if (err) { | |
583 | pr_err("Device addition failed\n"); | |
584 | goto exit_device_put; | |
585 | } | |
586 | ||
587 | return 0; | |
588 | ||
589 | exit_device_put: | |
590 | platform_device_put(sch56xx_pdev); | |
591 | ||
592 | return err; | |
593 | } | |
594 | ||
595 | static int __init sch56xx_init(void) | |
596 | { | |
313829ee GR |
597 | int address; |
598 | const char *name = NULL; | |
599 | ||
600 | address = sch56xx_find(0x4e, &name); | |
601 | if (address < 0) | |
602 | address = sch56xx_find(0x2e, &name); | |
603 | if (address < 0) | |
604 | return address; | |
28ff2f7a HG |
605 | |
606 | return sch56xx_device_add(address, name); | |
607 | } | |
608 | ||
609 | static void __exit sch56xx_exit(void) | |
610 | { | |
611 | platform_device_unregister(sch56xx_pdev); | |
612 | } | |
613 | ||
614 | MODULE_DESCRIPTION("SMSC SCH56xx Hardware Monitoring Common Code"); | |
615 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
616 | MODULE_LICENSE("GPL"); | |
617 | ||
618 | module_init(sch56xx_init); | |
619 | module_exit(sch56xx_exit); |