Commit | Line | Data |
---|---|---|
e9d35947 | 1 | /* |
c103de24 | 2 | * Access to GPIOs on TWL4030/TPS659x0 chips |
e9d35947 DB |
3 | * |
4 | * Copyright (C) 2006-2007 Texas Instruments, Inc. | |
5 | * Copyright (C) 2006 MontaVista Software, Inc. | |
6 | * | |
7 | * Code re-arranged and cleaned up by: | |
8 | * Syed Mohammed Khasim <x0khasim@ti.com> | |
9 | * | |
10 | * Initial Code: | |
11 | * Andy Lowe / Nishanth Menon | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/irq.h> | |
33 | #include <linux/gpio.h> | |
34 | #include <linux/platform_device.h> | |
b8589e2a BC |
35 | #include <linux/of.h> |
36 | #include <linux/irqdomain.h> | |
e9d35947 | 37 | |
b07682b6 | 38 | #include <linux/i2c/twl.h> |
e9d35947 DB |
39 | |
40 | ||
41 | /* | |
42 | * The GPIO "subchip" supports 18 GPIOs which can be configured as | |
43 | * inputs or outputs, with pullups or pulldowns on each pin. Each | |
44 | * GPIO can trigger interrupts on either or both edges. | |
45 | * | |
46 | * GPIO interrupts can be fed to either of two IRQ lines; this is | |
47 | * intended to support multiple hosts. | |
48 | * | |
49 | * There are also two LED pins used sometimes as output-only GPIOs. | |
50 | */ | |
51 | ||
52 | ||
53 | static struct gpio_chip twl_gpiochip; | |
a940d9a1 | 54 | static int twl4030_gpio_base; |
e9d35947 DB |
55 | static int twl4030_gpio_irq_base; |
56 | ||
57 | /* genirq interfaces are not available to modules */ | |
58 | #ifdef MODULE | |
59 | #define is_module() true | |
60 | #else | |
61 | #define is_module() false | |
62 | #endif | |
63 | ||
64 | /* GPIO_CTRL Fields */ | |
65 | #define MASK_GPIO_CTRL_GPIO0CD1 BIT(0) | |
66 | #define MASK_GPIO_CTRL_GPIO1CD2 BIT(1) | |
67 | #define MASK_GPIO_CTRL_GPIO_ON BIT(2) | |
68 | ||
69 | /* Mask for GPIO registers when aggregated into a 32-bit integer */ | |
70 | #define GPIO_32_MASK 0x0003ffff | |
71 | ||
72 | /* Data structures */ | |
73 | static DEFINE_MUTEX(gpio_lock); | |
74 | ||
75 | /* store usage of each GPIO. - each bit represents one GPIO */ | |
76 | static unsigned int gpio_usage_count; | |
77 | ||
78 | /*----------------------------------------------------------------------*/ | |
79 | ||
80 | /* | |
81 | * To configure TWL4030 GPIO module registers | |
82 | */ | |
83 | static inline int gpio_twl4030_write(u8 address, u8 data) | |
84 | { | |
fc7b92fc | 85 | return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address); |
e9d35947 DB |
86 | } |
87 | ||
88 | /*----------------------------------------------------------------------*/ | |
89 | ||
90 | /* | |
91 | * LED register offsets (use TWL4030_MODULE_{LED,PWMA,PWMB})) | |
92 | * PWMs A and B are dedicated to LEDs A and B, respectively. | |
93 | */ | |
94 | ||
95 | #define TWL4030_LED_LEDEN 0x0 | |
96 | ||
97 | /* LEDEN bits */ | |
98 | #define LEDEN_LEDAON BIT(0) | |
99 | #define LEDEN_LEDBON BIT(1) | |
100 | #define LEDEN_LEDAEXT BIT(2) | |
101 | #define LEDEN_LEDBEXT BIT(3) | |
102 | #define LEDEN_LEDAPWM BIT(4) | |
103 | #define LEDEN_LEDBPWM BIT(5) | |
104 | #define LEDEN_PWM_LENGTHA BIT(6) | |
105 | #define LEDEN_PWM_LENGTHB BIT(7) | |
106 | ||
107 | #define TWL4030_PWMx_PWMxON 0x0 | |
108 | #define TWL4030_PWMx_PWMxOFF 0x1 | |
109 | ||
110 | #define PWMxON_LENGTH BIT(7) | |
111 | ||
112 | /*----------------------------------------------------------------------*/ | |
113 | ||
114 | /* | |
115 | * To read a TWL4030 GPIO module register | |
116 | */ | |
117 | static inline int gpio_twl4030_read(u8 address) | |
118 | { | |
119 | u8 data; | |
120 | int ret = 0; | |
121 | ||
fc7b92fc | 122 | ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address); |
e9d35947 DB |
123 | return (ret < 0) ? ret : data; |
124 | } | |
125 | ||
126 | /*----------------------------------------------------------------------*/ | |
127 | ||
128 | static u8 cached_leden; /* protected by gpio_lock */ | |
129 | ||
130 | /* The LED lines are open drain outputs ... a FET pulls to GND, so an | |
131 | * external pullup is needed. We could also expose the integrated PWM | |
132 | * as a LED brightness control; we initialize it as "always on". | |
133 | */ | |
134 | static void twl4030_led_set_value(int led, int value) | |
135 | { | |
136 | u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM; | |
137 | int status; | |
138 | ||
139 | if (led) | |
140 | mask <<= 1; | |
141 | ||
142 | mutex_lock(&gpio_lock); | |
143 | if (value) | |
144 | cached_leden &= ~mask; | |
145 | else | |
146 | cached_leden |= mask; | |
fc7b92fc | 147 | status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden, |
e9d35947 DB |
148 | TWL4030_LED_LEDEN); |
149 | mutex_unlock(&gpio_lock); | |
150 | } | |
151 | ||
152 | static int twl4030_set_gpio_direction(int gpio, int is_input) | |
153 | { | |
154 | u8 d_bnk = gpio >> 3; | |
155 | u8 d_msk = BIT(gpio & 0x7); | |
156 | u8 reg = 0; | |
157 | u8 base = REG_GPIODATADIR1 + d_bnk; | |
158 | int ret = 0; | |
159 | ||
160 | mutex_lock(&gpio_lock); | |
161 | ret = gpio_twl4030_read(base); | |
162 | if (ret >= 0) { | |
163 | if (is_input) | |
164 | reg = ret & ~d_msk; | |
165 | else | |
166 | reg = ret | d_msk; | |
167 | ||
168 | ret = gpio_twl4030_write(base, reg); | |
169 | } | |
170 | mutex_unlock(&gpio_lock); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | static int twl4030_set_gpio_dataout(int gpio, int enable) | |
175 | { | |
176 | u8 d_bnk = gpio >> 3; | |
177 | u8 d_msk = BIT(gpio & 0x7); | |
178 | u8 base = 0; | |
179 | ||
180 | if (enable) | |
181 | base = REG_SETGPIODATAOUT1 + d_bnk; | |
182 | else | |
183 | base = REG_CLEARGPIODATAOUT1 + d_bnk; | |
184 | ||
185 | return gpio_twl4030_write(base, d_msk); | |
186 | } | |
187 | ||
188 | static int twl4030_get_gpio_datain(int gpio) | |
189 | { | |
190 | u8 d_bnk = gpio >> 3; | |
191 | u8 d_off = gpio & 0x7; | |
192 | u8 base = 0; | |
193 | int ret = 0; | |
194 | ||
195 | if (unlikely((gpio >= TWL4030_GPIO_MAX) | |
196 | || !(gpio_usage_count & BIT(gpio)))) | |
197 | return -EPERM; | |
198 | ||
199 | base = REG_GPIODATAIN1 + d_bnk; | |
200 | ret = gpio_twl4030_read(base); | |
201 | if (ret > 0) | |
202 | ret = (ret >> d_off) & 0x1; | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
e9d35947 DB |
207 | /*----------------------------------------------------------------------*/ |
208 | ||
209 | static int twl_request(struct gpio_chip *chip, unsigned offset) | |
210 | { | |
211 | int status = 0; | |
212 | ||
213 | mutex_lock(&gpio_lock); | |
214 | ||
215 | /* Support the two LED outputs as output-only GPIOs. */ | |
216 | if (offset >= TWL4030_GPIO_MAX) { | |
217 | u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT | |
218 | | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA; | |
219 | u8 module = TWL4030_MODULE_PWMA; | |
220 | ||
221 | offset -= TWL4030_GPIO_MAX; | |
222 | if (offset) { | |
223 | ledclr_mask <<= 1; | |
224 | module = TWL4030_MODULE_PWMB; | |
225 | } | |
226 | ||
227 | /* initialize PWM to always-drive */ | |
fc7b92fc | 228 | status = twl_i2c_write_u8(module, 0x7f, |
e9d35947 DB |
229 | TWL4030_PWMx_PWMxOFF); |
230 | if (status < 0) | |
231 | goto done; | |
fc7b92fc | 232 | status = twl_i2c_write_u8(module, 0x7f, |
e9d35947 DB |
233 | TWL4030_PWMx_PWMxON); |
234 | if (status < 0) | |
235 | goto done; | |
236 | ||
237 | /* init LED to not-driven (high) */ | |
238 | module = TWL4030_MODULE_LED; | |
fc7b92fc | 239 | status = twl_i2c_read_u8(module, &cached_leden, |
e9d35947 DB |
240 | TWL4030_LED_LEDEN); |
241 | if (status < 0) | |
242 | goto done; | |
243 | cached_leden &= ~ledclr_mask; | |
fc7b92fc | 244 | status = twl_i2c_write_u8(module, cached_leden, |
e9d35947 DB |
245 | TWL4030_LED_LEDEN); |
246 | if (status < 0) | |
247 | goto done; | |
248 | ||
249 | status = 0; | |
250 | goto done; | |
251 | } | |
252 | ||
253 | /* on first use, turn GPIO module "on" */ | |
254 | if (!gpio_usage_count) { | |
255 | struct twl4030_gpio_platform_data *pdata; | |
256 | u8 value = MASK_GPIO_CTRL_GPIO_ON; | |
257 | ||
258 | /* optionally have the first two GPIOs switch vMMC1 | |
259 | * and vMMC2 power supplies based on card presence. | |
260 | */ | |
261 | pdata = chip->dev->platform_data; | |
b8589e2a BC |
262 | if (pdata) |
263 | value |= pdata->mmc_cd & 0x03; | |
e9d35947 DB |
264 | |
265 | status = gpio_twl4030_write(REG_GPIO_CTRL, value); | |
266 | } | |
267 | ||
268 | if (!status) | |
269 | gpio_usage_count |= (0x1 << offset); | |
270 | ||
271 | done: | |
272 | mutex_unlock(&gpio_lock); | |
273 | return status; | |
274 | } | |
275 | ||
276 | static void twl_free(struct gpio_chip *chip, unsigned offset) | |
277 | { | |
278 | if (offset >= TWL4030_GPIO_MAX) { | |
279 | twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1); | |
280 | return; | |
281 | } | |
282 | ||
283 | mutex_lock(&gpio_lock); | |
284 | ||
285 | gpio_usage_count &= ~BIT(offset); | |
286 | ||
287 | /* on last use, switch off GPIO module */ | |
288 | if (!gpio_usage_count) | |
289 | gpio_twl4030_write(REG_GPIO_CTRL, 0x0); | |
290 | ||
291 | mutex_unlock(&gpio_lock); | |
292 | } | |
293 | ||
294 | static int twl_direction_in(struct gpio_chip *chip, unsigned offset) | |
295 | { | |
296 | return (offset < TWL4030_GPIO_MAX) | |
297 | ? twl4030_set_gpio_direction(offset, 1) | |
298 | : -EINVAL; | |
299 | } | |
300 | ||
301 | static int twl_get(struct gpio_chip *chip, unsigned offset) | |
302 | { | |
303 | int status = 0; | |
304 | ||
305 | if (offset < TWL4030_GPIO_MAX) | |
306 | status = twl4030_get_gpio_datain(offset); | |
307 | else if (offset == TWL4030_GPIO_MAX) | |
308 | status = cached_leden & LEDEN_LEDAON; | |
309 | else | |
310 | status = cached_leden & LEDEN_LEDBON; | |
311 | return (status < 0) ? 0 : status; | |
312 | } | |
313 | ||
314 | static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) | |
315 | { | |
316 | if (offset < TWL4030_GPIO_MAX) { | |
317 | twl4030_set_gpio_dataout(offset, value); | |
318 | return twl4030_set_gpio_direction(offset, 0); | |
319 | } else { | |
320 | twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value); | |
321 | return 0; | |
322 | } | |
323 | } | |
324 | ||
325 | static void twl_set(struct gpio_chip *chip, unsigned offset, int value) | |
326 | { | |
327 | if (offset < TWL4030_GPIO_MAX) | |
328 | twl4030_set_gpio_dataout(offset, value); | |
329 | else | |
330 | twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value); | |
331 | } | |
332 | ||
333 | static int twl_to_irq(struct gpio_chip *chip, unsigned offset) | |
334 | { | |
335 | return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX)) | |
336 | ? (twl4030_gpio_irq_base + offset) | |
337 | : -EINVAL; | |
338 | } | |
339 | ||
340 | static struct gpio_chip twl_gpiochip = { | |
341 | .label = "twl4030", | |
342 | .owner = THIS_MODULE, | |
343 | .request = twl_request, | |
344 | .free = twl_free, | |
345 | .direction_input = twl_direction_in, | |
346 | .get = twl_get, | |
347 | .direction_output = twl_direction_out, | |
348 | .set = twl_set, | |
349 | .to_irq = twl_to_irq, | |
350 | .can_sleep = 1, | |
351 | }; | |
352 | ||
353 | /*----------------------------------------------------------------------*/ | |
354 | ||
355 | static int __devinit gpio_twl4030_pulls(u32 ups, u32 downs) | |
356 | { | |
357 | u8 message[6]; | |
358 | unsigned i, gpio_bit; | |
359 | ||
360 | /* For most pins, a pulldown was enabled by default. | |
361 | * We should have data that's specific to this board. | |
362 | */ | |
363 | for (gpio_bit = 1, i = 1; i < 6; i++) { | |
364 | u8 bit_mask; | |
365 | unsigned j; | |
366 | ||
367 | for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) { | |
368 | if (ups & gpio_bit) | |
369 | bit_mask |= 1 << (j + 1); | |
370 | else if (downs & gpio_bit) | |
371 | bit_mask |= 1 << (j + 0); | |
372 | } | |
373 | message[i] = bit_mask; | |
374 | } | |
375 | ||
fc7b92fc | 376 | return twl_i2c_write(TWL4030_MODULE_GPIO, message, |
e9d35947 DB |
377 | REG_GPIOPUPDCTR1, 5); |
378 | } | |
379 | ||
cabb3fc4 DB |
380 | static int __devinit gpio_twl4030_debounce(u32 debounce, u8 mmc_cd) |
381 | { | |
382 | u8 message[4]; | |
383 | ||
384 | /* 30 msec of debouncing is always used for MMC card detect, | |
385 | * and is optional for everything else. | |
386 | */ | |
387 | message[1] = (debounce & 0xff) | (mmc_cd & 0x03); | |
388 | debounce >>= 8; | |
389 | message[2] = (debounce & 0xff); | |
390 | debounce >>= 8; | |
391 | message[3] = (debounce & 0x03); | |
392 | ||
fc7b92fc | 393 | return twl_i2c_write(TWL4030_MODULE_GPIO, message, |
cabb3fc4 DB |
394 | REG_GPIO_DEBEN1, 3); |
395 | } | |
396 | ||
e9d35947 DB |
397 | static int gpio_twl4030_remove(struct platform_device *pdev); |
398 | ||
f74ce8fb FV |
399 | static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev) |
400 | { | |
401 | struct twl4030_gpio_platform_data *omap_twl_info; | |
402 | ||
403 | omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL); | |
404 | if (!omap_twl_info) | |
405 | return NULL; | |
406 | ||
f74ce8fb FV |
407 | omap_twl_info->use_leds = of_property_read_bool(dev->of_node, |
408 | "ti,use-leds"); | |
409 | ||
410 | of_property_read_u32(dev->of_node, "ti,debounce", | |
411 | &omap_twl_info->debounce); | |
412 | of_property_read_u32(dev->of_node, "ti,mmc-cd", | |
413 | (u32 *)&omap_twl_info->mmc_cd); | |
414 | of_property_read_u32(dev->of_node, "ti,pullups", | |
415 | &omap_twl_info->pullups); | |
416 | of_property_read_u32(dev->of_node, "ti,pulldowns", | |
417 | &omap_twl_info->pulldowns); | |
418 | ||
419 | return omap_twl_info; | |
420 | } | |
421 | ||
e9d35947 DB |
422 | static int __devinit gpio_twl4030_probe(struct platform_device *pdev) |
423 | { | |
424 | struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data; | |
b8589e2a | 425 | struct device_node *node = pdev->dev.of_node; |
2d9dd99b | 426 | int ret, irq_base; |
e9d35947 DB |
427 | |
428 | /* maybe setup IRQs */ | |
2d9dd99b BC |
429 | if (is_module()) { |
430 | dev_err(&pdev->dev, "can't dispatch IRQs from modules\n"); | |
431 | goto no_irqs; | |
432 | } | |
433 | ||
434 | irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0); | |
435 | if (irq_base < 0) { | |
436 | dev_err(&pdev->dev, "Failed to alloc irq_descs\n"); | |
437 | return irq_base; | |
e9d35947 DB |
438 | } |
439 | ||
b8589e2a BC |
440 | irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0, |
441 | &irq_domain_simple_ops, NULL); | |
442 | ||
2d9dd99b BC |
443 | ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base); |
444 | if (ret < 0) | |
445 | return ret; | |
446 | ||
447 | twl4030_gpio_irq_base = irq_base; | |
448 | ||
e9d35947 | 449 | no_irqs: |
b8589e2a | 450 | twl_gpiochip.base = -1; |
e9d35947 DB |
451 | twl_gpiochip.ngpio = TWL4030_GPIO_MAX; |
452 | twl_gpiochip.dev = &pdev->dev; | |
453 | ||
f74ce8fb FV |
454 | if (node) |
455 | pdata = of_gpio_twl4030(&pdev->dev); | |
b8589e2a | 456 | |
f74ce8fb FV |
457 | if (pdata == NULL) { |
458 | dev_err(&pdev->dev, "Platform data is missing\n"); | |
459 | return -ENXIO; | |
b8589e2a | 460 | } |
e9d35947 | 461 | |
f74ce8fb FV |
462 | /* |
463 | * NOTE: boards may waste power if they don't set pullups | |
464 | * and pulldowns correctly ... default for non-ULPI pins is | |
465 | * pulldown, and some other pins may have external pullups | |
466 | * or pulldowns. Careful! | |
467 | */ | |
468 | ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns); | |
469 | if (ret) | |
470 | dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n", | |
471 | pdata->pullups, pdata->pulldowns, ret); | |
472 | ||
473 | ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd); | |
474 | if (ret) | |
475 | dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n", | |
476 | pdata->debounce, pdata->mmc_cd, ret); | |
477 | ||
478 | /* | |
479 | * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE, | |
480 | * is (still) clear if use_leds is set. | |
481 | */ | |
482 | if (pdata->use_leds) | |
483 | twl_gpiochip.ngpio += 2; | |
484 | ||
e9d35947 DB |
485 | ret = gpiochip_add(&twl_gpiochip); |
486 | if (ret < 0) { | |
2d9dd99b | 487 | dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret); |
e9d35947 DB |
488 | twl_gpiochip.ngpio = 0; |
489 | gpio_twl4030_remove(pdev); | |
a940d9a1 TL |
490 | goto out; |
491 | } | |
492 | ||
493 | twl4030_gpio_base = twl_gpiochip.base; | |
494 | ||
495 | if (pdata && pdata->setup) { | |
e9d35947 DB |
496 | int status; |
497 | ||
498 | status = pdata->setup(&pdev->dev, | |
a940d9a1 | 499 | twl4030_gpio_base, TWL4030_GPIO_MAX); |
e9d35947 DB |
500 | if (status) |
501 | dev_dbg(&pdev->dev, "setup --> %d\n", status); | |
502 | } | |
503 | ||
a940d9a1 | 504 | out: |
e9d35947 DB |
505 | return ret; |
506 | } | |
507 | ||
46c529cf MF |
508 | /* Cannot use __devexit as gpio_twl4030_probe() calls us */ |
509 | static int gpio_twl4030_remove(struct platform_device *pdev) | |
e9d35947 DB |
510 | { |
511 | struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data; | |
512 | int status; | |
513 | ||
b8589e2a | 514 | if (pdata && pdata->teardown) { |
e9d35947 | 515 | status = pdata->teardown(&pdev->dev, |
a940d9a1 | 516 | twl4030_gpio_base, TWL4030_GPIO_MAX); |
e9d35947 DB |
517 | if (status) { |
518 | dev_dbg(&pdev->dev, "teardown --> %d\n", status); | |
519 | return status; | |
520 | } | |
521 | } | |
522 | ||
523 | status = gpiochip_remove(&twl_gpiochip); | |
524 | if (status < 0) | |
525 | return status; | |
526 | ||
527 | if (is_module()) | |
528 | return 0; | |
529 | ||
530 | /* REVISIT no support yet for deregistering all the IRQs */ | |
531 | WARN_ON(1); | |
532 | return -EIO; | |
533 | } | |
534 | ||
b8589e2a BC |
535 | static const struct of_device_id twl_gpio_match[] = { |
536 | { .compatible = "ti,twl4030-gpio", }, | |
537 | { }, | |
538 | }; | |
539 | MODULE_DEVICE_TABLE(of, twl_gpio_match); | |
540 | ||
e9d35947 DB |
541 | /* Note: this hardware lives inside an I2C-based multi-function device. */ |
542 | MODULE_ALIAS("platform:twl4030_gpio"); | |
543 | ||
544 | static struct platform_driver gpio_twl4030_driver = { | |
b8589e2a BC |
545 | .driver = { |
546 | .name = "twl4030_gpio", | |
547 | .owner = THIS_MODULE, | |
548 | .of_match_table = of_match_ptr(twl_gpio_match), | |
549 | }, | |
e9d35947 | 550 | .probe = gpio_twl4030_probe, |
46c529cf | 551 | .remove = gpio_twl4030_remove, |
e9d35947 DB |
552 | }; |
553 | ||
554 | static int __init gpio_twl4030_init(void) | |
555 | { | |
556 | return platform_driver_register(&gpio_twl4030_driver); | |
557 | } | |
558 | subsys_initcall(gpio_twl4030_init); | |
559 | ||
560 | static void __exit gpio_twl4030_exit(void) | |
561 | { | |
562 | platform_driver_unregister(&gpio_twl4030_driver); | |
563 | } | |
564 | module_exit(gpio_twl4030_exit); | |
565 | ||
566 | MODULE_AUTHOR("Texas Instruments, Inc."); | |
567 | MODULE_DESCRIPTION("GPIO interface for TWL4030"); | |
568 | MODULE_LICENSE("GPL"); |