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Commit | Line | Data |
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6ed9f9c4 | 1 | /* |
3b923189 | 2 | * Intel ICH6-10, Series 5 and 6, Atom C2000 (Avoton/Rangeley) GPIO driver |
6ed9f9c4 PT |
3 | * |
4 | * Copyright (C) 2010 Extreme Engineering Solutions. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/gpio.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/mfd/lpc_ich.h> | |
28 | ||
29 | #define DRV_NAME "gpio_ich" | |
30 | ||
31 | /* | |
32 | * GPIO register offsets in GPIO I/O space. | |
33 | * Each chunk of 32 GPIOs is manipulated via its own USE_SELx, IO_SELx, and | |
34 | * LVLx registers. Logic in the read/write functions takes a register and | |
35 | * an absolute bit number and determines the proper register offset and bit | |
36 | * number in that register. For example, to read the value of GPIO bit 50 | |
37 | * the code would access offset ichx_regs[2(=GPIO_LVL)][1(=50/32)], | |
38 | * bit 18 (50%32). | |
39 | */ | |
40 | enum GPIO_REG { | |
41 | GPIO_USE_SEL = 0, | |
42 | GPIO_IO_SEL, | |
43 | GPIO_LVL, | |
7f6569f5 | 44 | GPO_BLINK |
6ed9f9c4 PT |
45 | }; |
46 | ||
7f6569f5 | 47 | static const u8 ichx_regs[4][3] = { |
6ed9f9c4 PT |
48 | {0x00, 0x30, 0x40}, /* USE_SEL[1-3] offsets */ |
49 | {0x04, 0x34, 0x44}, /* IO_SEL[1-3] offsets */ | |
50 | {0x0c, 0x38, 0x48}, /* LVL[1-3] offsets */ | |
7f6569f5 | 51 | {0x18, 0x18, 0x18}, /* BLINK offset */ |
6ed9f9c4 PT |
52 | }; |
53 | ||
4f600ada JD |
54 | static const u8 ichx_reglen[3] = { |
55 | 0x30, 0x10, 0x10, | |
56 | }; | |
57 | ||
3b923189 VD |
58 | static const u8 avoton_regs[4][3] = { |
59 | {0x00, 0x80, 0x00}, | |
60 | {0x04, 0x84, 0x00}, | |
61 | {0x08, 0x88, 0x00}, | |
62 | }; | |
63 | ||
64 | static const u8 avoton_reglen[3] = { | |
65 | 0x10, 0x10, 0x00, | |
66 | }; | |
67 | ||
6ed9f9c4 PT |
68 | #define ICHX_WRITE(val, reg, base_res) outl(val, (reg) + (base_res)->start) |
69 | #define ICHX_READ(reg, base_res) inl((reg) + (base_res)->start) | |
70 | ||
71 | struct ichx_desc { | |
72 | /* Max GPIO pins the chipset can have */ | |
73 | uint ngpio; | |
74 | ||
bb62a35b VD |
75 | /* chipset registers */ |
76 | const u8 (*regs)[3]; | |
77 | const u8 *reglen; | |
78 | ||
ba7f74fe VD |
79 | /* GPO_BLINK is available on this chipset */ |
80 | bool have_blink; | |
81 | ||
6ed9f9c4 PT |
82 | /* Whether the chipset has GPIO in GPE0_STS in the PM IO region */ |
83 | bool uses_gpe0; | |
84 | ||
85 | /* USE_SEL is bogus on some chipsets, eg 3100 */ | |
86 | u32 use_sel_ignore[3]; | |
87 | ||
88 | /* Some chipsets have quirks, let these use their own request/get */ | |
89 | int (*request)(struct gpio_chip *chip, unsigned offset); | |
90 | int (*get)(struct gpio_chip *chip, unsigned offset); | |
e6540f33 VD |
91 | |
92 | /* | |
93 | * Some chipsets don't let reading output values on GPIO_LVL register | |
94 | * this option allows driver caching written output values | |
95 | */ | |
96 | bool use_outlvl_cache; | |
6ed9f9c4 PT |
97 | }; |
98 | ||
99 | static struct { | |
100 | spinlock_t lock; | |
101 | struct platform_device *dev; | |
102 | struct gpio_chip chip; | |
103 | struct resource *gpio_base; /* GPIO IO base */ | |
104 | struct resource *pm_base; /* Power Mangagment IO base */ | |
105 | struct ichx_desc *desc; /* Pointer to chipset-specific description */ | |
106 | u32 orig_gpio_ctrl; /* Orig CTRL value, used to restore on exit */ | |
4f600ada | 107 | u8 use_gpio; /* Which GPIO groups are usable */ |
e6540f33 | 108 | int outlvl_cache[3]; /* cached output values */ |
6ed9f9c4 PT |
109 | } ichx_priv; |
110 | ||
111 | static int modparam_gpiobase = -1; /* dynamic */ | |
112 | module_param_named(gpiobase, modparam_gpiobase, int, 0444); | |
113 | MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, " | |
114 | "which is the default."); | |
115 | ||
116 | static int ichx_write_bit(int reg, unsigned nr, int val, int verify) | |
117 | { | |
118 | unsigned long flags; | |
119 | u32 data, tmp; | |
120 | int reg_nr = nr / 32; | |
121 | int bit = nr & 0x1f; | |
122 | int ret = 0; | |
123 | ||
124 | spin_lock_irqsave(&ichx_priv.lock, flags); | |
125 | ||
e6540f33 VD |
126 | if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache) |
127 | data = ichx_priv.outlvl_cache[reg_nr]; | |
128 | else | |
129 | data = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr], | |
130 | ichx_priv.gpio_base); | |
131 | ||
6ed9f9c4 PT |
132 | if (val) |
133 | data |= 1 << bit; | |
134 | else | |
135 | data &= ~(1 << bit); | |
bb62a35b VD |
136 | ICHX_WRITE(data, ichx_priv.desc->regs[reg][reg_nr], |
137 | ichx_priv.gpio_base); | |
e6540f33 VD |
138 | if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache) |
139 | ichx_priv.outlvl_cache[reg_nr] = data; | |
140 | ||
bb62a35b VD |
141 | tmp = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr], |
142 | ichx_priv.gpio_base); | |
6ed9f9c4 PT |
143 | if (verify && data != tmp) |
144 | ret = -EPERM; | |
145 | ||
146 | spin_unlock_irqrestore(&ichx_priv.lock, flags); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | static int ichx_read_bit(int reg, unsigned nr) | |
152 | { | |
153 | unsigned long flags; | |
154 | u32 data; | |
155 | int reg_nr = nr / 32; | |
156 | int bit = nr & 0x1f; | |
157 | ||
158 | spin_lock_irqsave(&ichx_priv.lock, flags); | |
159 | ||
bb62a35b VD |
160 | data = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr], |
161 | ichx_priv.gpio_base); | |
6ed9f9c4 | 162 | |
e6540f33 VD |
163 | if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache) |
164 | data = ichx_priv.outlvl_cache[reg_nr] | data; | |
165 | ||
6ed9f9c4 PT |
166 | spin_unlock_irqrestore(&ichx_priv.lock, flags); |
167 | ||
168 | return data & (1 << bit) ? 1 : 0; | |
169 | } | |
170 | ||
e97f9b52 | 171 | static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr) |
4f600ada | 172 | { |
61d793bb | 173 | return !!(ichx_priv.use_gpio & (1 << (nr / 32))); |
4f600ada JD |
174 | } |
175 | ||
6ed9f9c4 PT |
176 | static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) |
177 | { | |
178 | /* | |
179 | * Try setting pin as an input and verify it worked since many pins | |
180 | * are output-only. | |
181 | */ | |
182 | if (ichx_write_bit(GPIO_IO_SEL, nr, 1, 1)) | |
183 | return -EINVAL; | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, | |
189 | int val) | |
190 | { | |
7f6569f5 | 191 | /* Disable blink hardware which is available for GPIOs from 0 to 31. */ |
ba7f74fe | 192 | if (nr < 32 && ichx_priv.desc->have_blink) |
7f6569f5 VD |
193 | ichx_write_bit(GPO_BLINK, nr, 0, 0); |
194 | ||
6ed9f9c4 PT |
195 | /* Set GPIO output value. */ |
196 | ichx_write_bit(GPIO_LVL, nr, val, 0); | |
197 | ||
198 | /* | |
199 | * Try setting pin as an output and verify it worked since many pins | |
200 | * are input-only. | |
201 | */ | |
202 | if (ichx_write_bit(GPIO_IO_SEL, nr, 0, 1)) | |
203 | return -EINVAL; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr) | |
209 | { | |
210 | return ichx_read_bit(GPIO_LVL, nr); | |
211 | } | |
212 | ||
213 | static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr) | |
214 | { | |
215 | unsigned long flags; | |
216 | u32 data; | |
217 | ||
218 | /* | |
219 | * GPI 0 - 15 need to be read from the power management registers on | |
220 | * a ICH6/3100 bridge. | |
221 | */ | |
222 | if (nr < 16) { | |
223 | if (!ichx_priv.pm_base) | |
224 | return -ENXIO; | |
225 | ||
226 | spin_lock_irqsave(&ichx_priv.lock, flags); | |
227 | ||
228 | /* GPI 0 - 15 are latched, write 1 to clear*/ | |
229 | ICHX_WRITE(1 << (16 + nr), 0, ichx_priv.pm_base); | |
230 | data = ICHX_READ(0, ichx_priv.pm_base); | |
231 | ||
232 | spin_unlock_irqrestore(&ichx_priv.lock, flags); | |
233 | ||
234 | return (data >> 16) & (1 << nr) ? 1 : 0; | |
235 | } else { | |
236 | return ichx_gpio_get(chip, nr); | |
237 | } | |
238 | } | |
239 | ||
240 | static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr) | |
241 | { | |
25f27db4 JD |
242 | if (!ichx_gpio_check_available(chip, nr)) |
243 | return -ENXIO; | |
244 | ||
6ed9f9c4 PT |
245 | /* |
246 | * Note we assume the BIOS properly set a bridge's USE value. Some | |
247 | * chips (eg Intel 3100) have bogus USE values though, so first see if | |
248 | * the chipset's USE value can be trusted for this specific bit. | |
249 | * If it can't be trusted, assume that the pin can be used as a GPIO. | |
250 | */ | |
251 | if (ichx_priv.desc->use_sel_ignore[nr / 32] & (1 << (nr & 0x1f))) | |
2ab3a749 | 252 | return 0; |
6ed9f9c4 PT |
253 | |
254 | return ichx_read_bit(GPIO_USE_SEL, nr) ? 0 : -ENODEV; | |
255 | } | |
256 | ||
257 | static int ich6_gpio_request(struct gpio_chip *chip, unsigned nr) | |
258 | { | |
259 | /* | |
260 | * Fixups for bits 16 and 17 are necessary on the Intel ICH6/3100 | |
261 | * bridge as they are controlled by USE register bits 0 and 1. See | |
262 | * "Table 704 GPIO_USE_SEL1 register" in the i3100 datasheet for | |
263 | * additional info. | |
264 | */ | |
265 | if (nr == 16 || nr == 17) | |
266 | nr -= 16; | |
267 | ||
268 | return ichx_gpio_request(chip, nr); | |
269 | } | |
270 | ||
271 | static void ichx_gpio_set(struct gpio_chip *chip, unsigned nr, int val) | |
272 | { | |
273 | ichx_write_bit(GPIO_LVL, nr, val, 0); | |
274 | } | |
275 | ||
3836309d | 276 | static void ichx_gpiolib_setup(struct gpio_chip *chip) |
6ed9f9c4 PT |
277 | { |
278 | chip->owner = THIS_MODULE; | |
279 | chip->label = DRV_NAME; | |
280 | chip->dev = &ichx_priv.dev->dev; | |
281 | ||
282 | /* Allow chip-specific overrides of request()/get() */ | |
283 | chip->request = ichx_priv.desc->request ? | |
284 | ichx_priv.desc->request : ichx_gpio_request; | |
285 | chip->get = ichx_priv.desc->get ? | |
286 | ichx_priv.desc->get : ichx_gpio_get; | |
287 | ||
288 | chip->set = ichx_gpio_set; | |
289 | chip->direction_input = ichx_gpio_direction_input; | |
290 | chip->direction_output = ichx_gpio_direction_output; | |
291 | chip->base = modparam_gpiobase; | |
292 | chip->ngpio = ichx_priv.desc->ngpio; | |
9fb1f39e | 293 | chip->can_sleep = false; |
6ed9f9c4 PT |
294 | chip->dbg_show = NULL; |
295 | } | |
296 | ||
297 | /* ICH6-based, 631xesb-based */ | |
298 | static struct ichx_desc ich6_desc = { | |
299 | /* Bridges using the ICH6 controller need fixups for GPIO 0 - 17 */ | |
300 | .request = ich6_gpio_request, | |
301 | .get = ich6_gpio_get, | |
302 | ||
303 | /* GPIO 0-15 are read in the GPE0_STS PM register */ | |
304 | .uses_gpe0 = true, | |
305 | ||
306 | .ngpio = 50, | |
ba7f74fe | 307 | .have_blink = true, |
a7008ee1 VD |
308 | .regs = ichx_regs, |
309 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
310 | }; |
311 | ||
312 | /* Intel 3100 */ | |
313 | static struct ichx_desc i3100_desc = { | |
314 | /* | |
315 | * Bits 16,17, 20 of USE_SEL and bit 16 of USE_SEL2 always read 0 on | |
316 | * the Intel 3100. See "Table 712. GPIO Summary Table" of 3100 | |
317 | * Datasheet for more info. | |
318 | */ | |
319 | .use_sel_ignore = {0x00130000, 0x00010000, 0x0}, | |
320 | ||
321 | /* The 3100 needs fixups for GPIO 0 - 17 */ | |
322 | .request = ich6_gpio_request, | |
323 | .get = ich6_gpio_get, | |
324 | ||
325 | /* GPIO 0-15 are read in the GPE0_STS PM register */ | |
326 | .uses_gpe0 = true, | |
327 | ||
328 | .ngpio = 50, | |
a7008ee1 VD |
329 | .regs = ichx_regs, |
330 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
331 | }; |
332 | ||
333 | /* ICH7 and ICH8-based */ | |
334 | static struct ichx_desc ich7_desc = { | |
335 | .ngpio = 50, | |
ba7f74fe | 336 | .have_blink = true, |
bb62a35b VD |
337 | .regs = ichx_regs, |
338 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
339 | }; |
340 | ||
341 | /* ICH9-based */ | |
342 | static struct ichx_desc ich9_desc = { | |
343 | .ngpio = 61, | |
ba7f74fe | 344 | .have_blink = true, |
bb62a35b VD |
345 | .regs = ichx_regs, |
346 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
347 | }; |
348 | ||
349 | /* ICH10-based - Consumer/corporate versions have different amount of GPIO */ | |
350 | static struct ichx_desc ich10_cons_desc = { | |
351 | .ngpio = 61, | |
ba7f74fe | 352 | .have_blink = true, |
bb62a35b VD |
353 | .regs = ichx_regs, |
354 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
355 | }; |
356 | static struct ichx_desc ich10_corp_desc = { | |
357 | .ngpio = 72, | |
ba7f74fe | 358 | .have_blink = true, |
bb62a35b VD |
359 | .regs = ichx_regs, |
360 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
361 | }; |
362 | ||
363 | /* Intel 5 series, 6 series, 3400 series, and C200 series */ | |
364 | static struct ichx_desc intel5_desc = { | |
365 | .ngpio = 76, | |
bb62a35b VD |
366 | .regs = ichx_regs, |
367 | .reglen = ichx_reglen, | |
6ed9f9c4 PT |
368 | }; |
369 | ||
3b923189 VD |
370 | /* Avoton */ |
371 | static struct ichx_desc avoton_desc = { | |
372 | /* Avoton has only 59 GPIOs, but we assume the first set of register | |
373 | * (Core) has 32 instead of 31 to keep gpio-ich compliance | |
374 | */ | |
375 | .ngpio = 60, | |
376 | .regs = avoton_regs, | |
377 | .reglen = avoton_reglen, | |
378 | .use_outlvl_cache = true, | |
379 | }; | |
380 | ||
3836309d | 381 | static int ichx_gpio_request_regions(struct resource *res_base, |
4f600ada JD |
382 | const char *name, u8 use_gpio) |
383 | { | |
384 | int i; | |
385 | ||
386 | if (!res_base || !res_base->start || !res_base->end) | |
387 | return -ENODEV; | |
388 | ||
bb62a35b | 389 | for (i = 0; i < ARRAY_SIZE(ichx_priv.desc->regs[0]); i++) { |
4f600ada JD |
390 | if (!(use_gpio & (1 << i))) |
391 | continue; | |
bb62a35b VD |
392 | if (!request_region( |
393 | res_base->start + ichx_priv.desc->regs[0][i], | |
394 | ichx_priv.desc->reglen[i], name)) | |
4f600ada JD |
395 | goto request_err; |
396 | } | |
397 | return 0; | |
398 | ||
399 | request_err: | |
400 | /* Clean up: release already requested regions, if any */ | |
401 | for (i--; i >= 0; i--) { | |
402 | if (!(use_gpio & (1 << i))) | |
403 | continue; | |
bb62a35b VD |
404 | release_region(res_base->start + ichx_priv.desc->regs[0][i], |
405 | ichx_priv.desc->reglen[i]); | |
4f600ada JD |
406 | } |
407 | return -EBUSY; | |
408 | } | |
409 | ||
410 | static void ichx_gpio_release_regions(struct resource *res_base, u8 use_gpio) | |
411 | { | |
412 | int i; | |
413 | ||
bb62a35b | 414 | for (i = 0; i < ARRAY_SIZE(ichx_priv.desc->regs[0]); i++) { |
4f600ada JD |
415 | if (!(use_gpio & (1 << i))) |
416 | continue; | |
bb62a35b VD |
417 | release_region(res_base->start + ichx_priv.desc->regs[0][i], |
418 | ichx_priv.desc->reglen[i]); | |
4f600ada JD |
419 | } |
420 | } | |
421 | ||
3836309d | 422 | static int ichx_gpio_probe(struct platform_device *pdev) |
6ed9f9c4 PT |
423 | { |
424 | struct resource *res_base, *res_pm; | |
425 | int err; | |
e56aee18 | 426 | struct lpc_ich_info *ich_info = dev_get_platdata(&pdev->dev); |
6ed9f9c4 PT |
427 | |
428 | if (!ich_info) | |
429 | return -ENODEV; | |
430 | ||
431 | ichx_priv.dev = pdev; | |
432 | ||
433 | switch (ich_info->gpio_version) { | |
434 | case ICH_I3100_GPIO: | |
435 | ichx_priv.desc = &i3100_desc; | |
436 | break; | |
437 | case ICH_V5_GPIO: | |
438 | ichx_priv.desc = &intel5_desc; | |
439 | break; | |
440 | case ICH_V6_GPIO: | |
441 | ichx_priv.desc = &ich6_desc; | |
442 | break; | |
443 | case ICH_V7_GPIO: | |
444 | ichx_priv.desc = &ich7_desc; | |
445 | break; | |
446 | case ICH_V9_GPIO: | |
447 | ichx_priv.desc = &ich9_desc; | |
448 | break; | |
449 | case ICH_V10CORP_GPIO: | |
450 | ichx_priv.desc = &ich10_corp_desc; | |
451 | break; | |
452 | case ICH_V10CONS_GPIO: | |
453 | ichx_priv.desc = &ich10_cons_desc; | |
454 | break; | |
3b923189 VD |
455 | case AVOTON_GPIO: |
456 | ichx_priv.desc = &avoton_desc; | |
457 | break; | |
6ed9f9c4 PT |
458 | default: |
459 | return -ENODEV; | |
460 | } | |
461 | ||
d39a948f | 462 | spin_lock_init(&ichx_priv.lock); |
6ed9f9c4 | 463 | res_base = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPIO); |
4f600ada JD |
464 | ichx_priv.use_gpio = ich_info->use_gpio; |
465 | err = ichx_gpio_request_regions(res_base, pdev->name, | |
466 | ichx_priv.use_gpio); | |
467 | if (err) | |
468 | return err; | |
6ed9f9c4 PT |
469 | |
470 | ichx_priv.gpio_base = res_base; | |
471 | ||
472 | /* | |
473 | * If necessary, determine the I/O address of ACPI/power management | |
474 | * registers which are needed to read the the GPE0 register for GPI pins | |
475 | * 0 - 15 on some chipsets. | |
476 | */ | |
477 | if (!ichx_priv.desc->uses_gpe0) | |
478 | goto init; | |
479 | ||
480 | res_pm = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPE0); | |
481 | if (!res_pm) { | |
482 | pr_warn("ACPI BAR is unavailable, GPI 0 - 15 unavailable\n"); | |
483 | goto init; | |
484 | } | |
485 | ||
486 | if (!request_region(res_pm->start, resource_size(res_pm), | |
487 | pdev->name)) { | |
488 | pr_warn("ACPI BAR is busy, GPI 0 - 15 unavailable\n"); | |
489 | goto init; | |
490 | } | |
491 | ||
492 | ichx_priv.pm_base = res_pm; | |
493 | ||
494 | init: | |
495 | ichx_gpiolib_setup(&ichx_priv.chip); | |
496 | err = gpiochip_add(&ichx_priv.chip); | |
497 | if (err) { | |
498 | pr_err("Failed to register GPIOs\n"); | |
499 | goto add_err; | |
500 | } | |
501 | ||
502 | pr_info("GPIO from %d to %d on %s\n", ichx_priv.chip.base, | |
503 | ichx_priv.chip.base + ichx_priv.chip.ngpio - 1, DRV_NAME); | |
504 | ||
505 | return 0; | |
506 | ||
507 | add_err: | |
4f600ada | 508 | ichx_gpio_release_regions(ichx_priv.gpio_base, ichx_priv.use_gpio); |
6ed9f9c4 PT |
509 | if (ichx_priv.pm_base) |
510 | release_region(ichx_priv.pm_base->start, | |
511 | resource_size(ichx_priv.pm_base)); | |
512 | return err; | |
513 | } | |
514 | ||
206210ce | 515 | static int ichx_gpio_remove(struct platform_device *pdev) |
6ed9f9c4 | 516 | { |
9f5132ae | 517 | gpiochip_remove(&ichx_priv.chip); |
6ed9f9c4 | 518 | |
4f600ada | 519 | ichx_gpio_release_regions(ichx_priv.gpio_base, ichx_priv.use_gpio); |
6ed9f9c4 PT |
520 | if (ichx_priv.pm_base) |
521 | release_region(ichx_priv.pm_base->start, | |
522 | resource_size(ichx_priv.pm_base)); | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | static struct platform_driver ichx_gpio_driver = { | |
528 | .driver = { | |
6ed9f9c4 PT |
529 | .name = DRV_NAME, |
530 | }, | |
531 | .probe = ichx_gpio_probe, | |
8283c4ff | 532 | .remove = ichx_gpio_remove, |
6ed9f9c4 PT |
533 | }; |
534 | ||
535 | module_platform_driver(ichx_gpio_driver); | |
536 | ||
537 | MODULE_AUTHOR("Peter Tyser <ptyser@xes-inc.com>"); | |
538 | MODULE_DESCRIPTION("GPIO interface for Intel ICH series"); | |
539 | MODULE_LICENSE("GPL"); | |
540 | MODULE_ALIAS("platform:"DRV_NAME); |