1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Access to GPIOs on TWL4030/TPS659x0 chips |
4 | * |
5 | * Copyright (C) 2006-2007 Texas Instruments, Inc. |
6 | * Copyright (C) 2006 MontaVista Software, Inc. |
7 | * |
8 | * Code re-arranged and cleaned up by: |
9 | * Syed Mohammed Khasim <x0khasim@ti.com> |
10 | * |
11 | * Initial Code: |
12 | * Andy Lowe / Nishanth Menon |
13 | */ |
14 | |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> |
17 | #include <linux/interrupt.h> |
18 | #include <linux/kthread.h> |
19 | #include <linux/irq.h> |
20 | #include <linux/gpio/machine.h> |
21 | #include <linux/gpio/driver.h> |
22 | #include <linux/gpio/consumer.h> |
23 | #include <linux/platform_device.h> |
24 | #include <linux/of.h> |
25 | #include <linux/irqdomain.h> |
26 | |
27 | #include <linux/mfd/twl.h> |
28 | |
29 | /* |
30 | * The GPIO "subchip" supports 18 GPIOs which can be configured as |
31 | * inputs or outputs, with pullups or pulldowns on each pin. Each |
32 | * GPIO can trigger interrupts on either or both edges. |
33 | * |
34 | * GPIO interrupts can be fed to either of two IRQ lines; this is |
35 | * intended to support multiple hosts. |
36 | * |
37 | * There are also two LED pins used sometimes as output-only GPIOs. |
38 | */ |
39 | |
40 | /* genirq interfaces are not available to modules */ |
41 | #ifdef MODULE |
42 | #define is_module() true |
43 | #else |
44 | #define is_module() false |
45 | #endif |
46 | |
47 | /* GPIO_CTRL Fields */ |
48 | #define MASK_GPIO_CTRL_GPIO0CD1 BIT(0) |
49 | #define MASK_GPIO_CTRL_GPIO1CD2 BIT(1) |
50 | #define MASK_GPIO_CTRL_GPIO_ON BIT(2) |
51 | |
52 | /* Mask for GPIO registers when aggregated into a 32-bit integer */ |
53 | #define GPIO_32_MASK 0x0003ffff |
54 | |
55 | struct gpio_twl4030_priv { |
56 | struct gpio_chip gpio_chip; |
57 | struct mutex mutex; |
58 | int irq_base; |
59 | |
60 | /* Bitfields for state caching */ |
61 | unsigned int usage_count; |
62 | unsigned int direction; |
63 | unsigned int out_state; |
64 | }; |
65 | |
66 | /*----------------------------------------------------------------------*/ |
67 | |
68 | /* |
69 | * To configure TWL4030 GPIO module registers |
70 | */ |
71 | static inline int gpio_twl4030_write(u8 address, u8 data) |
72 | { |
73 | return twl_i2c_write_u8(mod_no: TWL4030_MODULE_GPIO, val: data, reg: address); |
74 | } |
75 | |
76 | /*----------------------------------------------------------------------*/ |
77 | |
78 | /* |
79 | * LED register offsets from TWL_MODULE_LED base |
80 | * PWMs A and B are dedicated to LEDs A and B, respectively. |
81 | */ |
82 | |
83 | #define TWL4030_LED_LEDEN_REG 0x00 |
84 | #define TWL4030_PWMAON_REG 0x01 |
85 | #define TWL4030_PWMAOFF_REG 0x02 |
86 | #define TWL4030_PWMBON_REG 0x03 |
87 | #define TWL4030_PWMBOFF_REG 0x04 |
88 | |
89 | /* LEDEN bits */ |
90 | #define LEDEN_LEDAON BIT(0) |
91 | #define LEDEN_LEDBON BIT(1) |
92 | #define LEDEN_LEDAEXT BIT(2) |
93 | #define LEDEN_LEDBEXT BIT(3) |
94 | #define LEDEN_LEDAPWM BIT(4) |
95 | #define LEDEN_LEDBPWM BIT(5) |
96 | #define LEDEN_PWM_LENGTHA BIT(6) |
97 | #define LEDEN_PWM_LENGTHB BIT(7) |
98 | |
99 | #define PWMxON_LENGTH BIT(7) |
100 | |
101 | /*----------------------------------------------------------------------*/ |
102 | |
103 | /* |
104 | * To read a TWL4030 GPIO module register |
105 | */ |
106 | static inline int gpio_twl4030_read(u8 address) |
107 | { |
108 | u8 data; |
109 | int ret = 0; |
110 | |
111 | ret = twl_i2c_read_u8(mod_no: TWL4030_MODULE_GPIO, val: &data, reg: address); |
112 | return (ret < 0) ? ret : data; |
113 | } |
114 | |
115 | /*----------------------------------------------------------------------*/ |
116 | |
117 | static u8 cached_leden; |
118 | |
119 | /* The LED lines are open drain outputs ... a FET pulls to GND, so an |
120 | * external pullup is needed. We could also expose the integrated PWM |
121 | * as a LED brightness control; we initialize it as "always on". |
122 | */ |
123 | static void twl4030_led_set_value(int led, int value) |
124 | { |
125 | u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM; |
126 | |
127 | if (led) |
128 | mask <<= 1; |
129 | |
130 | if (value) |
131 | cached_leden &= ~mask; |
132 | else |
133 | cached_leden |= mask; |
134 | |
135 | WARN_ON_ONCE(twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden, |
136 | TWL4030_LED_LEDEN_REG)); |
137 | } |
138 | |
139 | static int twl4030_set_gpio_direction(int gpio, int is_input) |
140 | { |
141 | u8 d_bnk = gpio >> 3; |
142 | u8 d_msk = BIT(gpio & 0x7); |
143 | u8 reg = 0; |
144 | u8 base = REG_GPIODATADIR1 + d_bnk; |
145 | int ret = 0; |
146 | |
147 | ret = gpio_twl4030_read(address: base); |
148 | if (ret >= 0) { |
149 | if (is_input) |
150 | reg = ret & ~d_msk; |
151 | else |
152 | reg = ret | d_msk; |
153 | |
154 | ret = gpio_twl4030_write(address: base, data: reg); |
155 | } |
156 | return ret; |
157 | } |
158 | |
159 | static int twl4030_get_gpio_direction(int gpio) |
160 | { |
161 | u8 d_bnk = gpio >> 3; |
162 | u8 d_msk = BIT(gpio & 0x7); |
163 | u8 base = REG_GPIODATADIR1 + d_bnk; |
164 | int ret = 0; |
165 | |
166 | ret = gpio_twl4030_read(address: base); |
167 | if (ret < 0) |
168 | return ret; |
169 | |
170 | if (ret & d_msk) |
171 | return GPIO_LINE_DIRECTION_OUT; |
172 | |
173 | return GPIO_LINE_DIRECTION_IN; |
174 | } |
175 | |
176 | static int twl4030_set_gpio_dataout(int gpio, int enable) |
177 | { |
178 | u8 d_bnk = gpio >> 3; |
179 | u8 d_msk = BIT(gpio & 0x7); |
180 | u8 base = 0; |
181 | |
182 | if (enable) |
183 | base = REG_SETGPIODATAOUT1 + d_bnk; |
184 | else |
185 | base = REG_CLEARGPIODATAOUT1 + d_bnk; |
186 | |
187 | return gpio_twl4030_write(address: base, data: d_msk); |
188 | } |
189 | |
190 | static int twl4030_get_gpio_datain(int gpio) |
191 | { |
192 | u8 d_bnk = gpio >> 3; |
193 | u8 d_off = gpio & 0x7; |
194 | u8 base = 0; |
195 | int ret = 0; |
196 | |
197 | base = REG_GPIODATAIN1 + d_bnk; |
198 | ret = gpio_twl4030_read(address: base); |
199 | if (ret > 0) |
200 | ret = (ret >> d_off) & 0x1; |
201 | |
202 | return ret; |
203 | } |
204 | |
205 | /*----------------------------------------------------------------------*/ |
206 | |
207 | static int twl_request(struct gpio_chip *chip, unsigned offset) |
208 | { |
209 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
210 | int status = 0; |
211 | |
212 | mutex_lock(&priv->mutex); |
213 | |
214 | /* Support the two LED outputs as output-only GPIOs. */ |
215 | if (offset >= TWL4030_GPIO_MAX) { |
216 | u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT |
217 | | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA; |
218 | u8 reg = TWL4030_PWMAON_REG; |
219 | |
220 | offset -= TWL4030_GPIO_MAX; |
221 | if (offset) { |
222 | ledclr_mask <<= 1; |
223 | reg = TWL4030_PWMBON_REG; |
224 | } |
225 | |
226 | /* initialize PWM to always-drive */ |
227 | /* Configure PWM OFF register first */ |
228 | status = twl_i2c_write_u8(TWL4030_MODULE_LED, val: 0x7f, reg: reg + 1); |
229 | if (status < 0) |
230 | goto done; |
231 | |
232 | /* Followed by PWM ON register */ |
233 | status = twl_i2c_write_u8(TWL4030_MODULE_LED, val: 0x7f, reg); |
234 | if (status < 0) |
235 | goto done; |
236 | |
237 | /* init LED to not-driven (high) */ |
238 | status = twl_i2c_read_u8(TWL4030_MODULE_LED, val: &cached_leden, |
239 | TWL4030_LED_LEDEN_REG); |
240 | if (status < 0) |
241 | goto done; |
242 | cached_leden &= ~ledclr_mask; |
243 | status = twl_i2c_write_u8(TWL4030_MODULE_LED, val: cached_leden, |
244 | TWL4030_LED_LEDEN_REG); |
245 | if (status < 0) |
246 | goto done; |
247 | |
248 | status = 0; |
249 | goto done; |
250 | } |
251 | |
252 | /* on first use, turn GPIO module "on" */ |
253 | if (!priv->usage_count) { |
254 | struct twl4030_gpio_platform_data *pdata; |
255 | u8 value = MASK_GPIO_CTRL_GPIO_ON; |
256 | |
257 | /* optionally have the first two GPIOs switch vMMC1 |
258 | * and vMMC2 power supplies based on card presence. |
259 | */ |
260 | pdata = dev_get_platdata(dev: chip->parent); |
261 | if (pdata) |
262 | value |= pdata->mmc_cd & 0x03; |
263 | |
264 | status = gpio_twl4030_write(REG_GPIO_CTRL, data: value); |
265 | } |
266 | |
267 | done: |
268 | if (!status) |
269 | priv->usage_count |= BIT(offset); |
270 | |
271 | mutex_unlock(lock: &priv->mutex); |
272 | return status; |
273 | } |
274 | |
275 | static void twl_free(struct gpio_chip *chip, unsigned offset) |
276 | { |
277 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
278 | |
279 | mutex_lock(&priv->mutex); |
280 | if (offset >= TWL4030_GPIO_MAX) { |
281 | twl4030_led_set_value(led: offset - TWL4030_GPIO_MAX, value: 1); |
282 | goto out; |
283 | } |
284 | |
285 | priv->usage_count &= ~BIT(offset); |
286 | |
287 | /* on last use, switch off GPIO module */ |
288 | if (!priv->usage_count) |
289 | gpio_twl4030_write(REG_GPIO_CTRL, data: 0x0); |
290 | |
291 | out: |
292 | mutex_unlock(lock: &priv->mutex); |
293 | } |
294 | |
295 | static int twl_direction_in(struct gpio_chip *chip, unsigned offset) |
296 | { |
297 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
298 | int ret; |
299 | |
300 | mutex_lock(&priv->mutex); |
301 | if (offset < TWL4030_GPIO_MAX) |
302 | ret = twl4030_set_gpio_direction(gpio: offset, is_input: 1); |
303 | else |
304 | ret = -EINVAL; /* LED outputs can't be set as input */ |
305 | |
306 | if (!ret) |
307 | priv->direction &= ~BIT(offset); |
308 | |
309 | mutex_unlock(lock: &priv->mutex); |
310 | |
311 | return ret; |
312 | } |
313 | |
314 | static int twl_get(struct gpio_chip *chip, unsigned offset) |
315 | { |
316 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
317 | int ret; |
318 | int status = 0; |
319 | |
320 | mutex_lock(&priv->mutex); |
321 | if (!(priv->usage_count & BIT(offset))) { |
322 | ret = -EPERM; |
323 | goto out; |
324 | } |
325 | |
326 | if (priv->direction & BIT(offset)) |
327 | status = priv->out_state & BIT(offset); |
328 | else |
329 | status = twl4030_get_gpio_datain(gpio: offset); |
330 | |
331 | ret = (status < 0) ? status : !!status; |
332 | out: |
333 | mutex_unlock(lock: &priv->mutex); |
334 | return ret; |
335 | } |
336 | |
337 | static void twl_set(struct gpio_chip *chip, unsigned offset, int value) |
338 | { |
339 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
340 | |
341 | mutex_lock(&priv->mutex); |
342 | if (offset < TWL4030_GPIO_MAX) |
343 | twl4030_set_gpio_dataout(gpio: offset, enable: value); |
344 | else |
345 | twl4030_led_set_value(led: offset - TWL4030_GPIO_MAX, value); |
346 | |
347 | if (value) |
348 | priv->out_state |= BIT(offset); |
349 | else |
350 | priv->out_state &= ~BIT(offset); |
351 | |
352 | mutex_unlock(lock: &priv->mutex); |
353 | } |
354 | |
355 | static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) |
356 | { |
357 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
358 | int ret = 0; |
359 | |
360 | mutex_lock(&priv->mutex); |
361 | if (offset < TWL4030_GPIO_MAX) { |
362 | ret = twl4030_set_gpio_direction(gpio: offset, is_input: 0); |
363 | if (ret) { |
364 | mutex_unlock(lock: &priv->mutex); |
365 | return ret; |
366 | } |
367 | } |
368 | |
369 | /* |
370 | * LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output |
371 | */ |
372 | |
373 | priv->direction |= BIT(offset); |
374 | mutex_unlock(lock: &priv->mutex); |
375 | |
376 | twl_set(chip, offset, value); |
377 | |
378 | return ret; |
379 | } |
380 | |
381 | static int twl_get_direction(struct gpio_chip *chip, unsigned offset) |
382 | { |
383 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
384 | /* |
385 | * Default GPIO_LINE_DIRECTION_OUT |
386 | * LED GPIOs >= TWL4030_GPIO_MAX are always output |
387 | */ |
388 | int ret = GPIO_LINE_DIRECTION_OUT; |
389 | |
390 | mutex_lock(&priv->mutex); |
391 | if (offset < TWL4030_GPIO_MAX) { |
392 | ret = twl4030_get_gpio_direction(gpio: offset); |
393 | if (ret) { |
394 | mutex_unlock(lock: &priv->mutex); |
395 | return ret; |
396 | } |
397 | } |
398 | mutex_unlock(lock: &priv->mutex); |
399 | |
400 | return ret; |
401 | } |
402 | |
403 | static int twl_to_irq(struct gpio_chip *chip, unsigned offset) |
404 | { |
405 | struct gpio_twl4030_priv *priv = gpiochip_get_data(gc: chip); |
406 | |
407 | return (priv->irq_base && (offset < TWL4030_GPIO_MAX)) |
408 | ? (priv->irq_base + offset) |
409 | : -EINVAL; |
410 | } |
411 | |
412 | static const struct gpio_chip template_chip = { |
413 | .label = "twl4030" , |
414 | .owner = THIS_MODULE, |
415 | .request = twl_request, |
416 | .free = twl_free, |
417 | .direction_input = twl_direction_in, |
418 | .direction_output = twl_direction_out, |
419 | .get_direction = twl_get_direction, |
420 | .get = twl_get, |
421 | .set = twl_set, |
422 | .to_irq = twl_to_irq, |
423 | .can_sleep = true, |
424 | }; |
425 | |
426 | /*----------------------------------------------------------------------*/ |
427 | |
428 | static int gpio_twl4030_pulls(u32 ups, u32 downs) |
429 | { |
430 | u8 message[5]; |
431 | unsigned i, gpio_bit; |
432 | |
433 | /* For most pins, a pulldown was enabled by default. |
434 | * We should have data that's specific to this board. |
435 | */ |
436 | for (gpio_bit = 1, i = 0; i < 5; i++) { |
437 | u8 bit_mask; |
438 | unsigned j; |
439 | |
440 | for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) { |
441 | if (ups & gpio_bit) |
442 | bit_mask |= 1 << (j + 1); |
443 | else if (downs & gpio_bit) |
444 | bit_mask |= 1 << (j + 0); |
445 | } |
446 | message[i] = bit_mask; |
447 | } |
448 | |
449 | return twl_i2c_write(mod_no: TWL4030_MODULE_GPIO, value: message, |
450 | REG_GPIOPUPDCTR1, num_bytes: 5); |
451 | } |
452 | |
453 | static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd) |
454 | { |
455 | u8 message[3]; |
456 | |
457 | /* 30 msec of debouncing is always used for MMC card detect, |
458 | * and is optional for everything else. |
459 | */ |
460 | message[0] = (debounce & 0xff) | (mmc_cd & 0x03); |
461 | debounce >>= 8; |
462 | message[1] = (debounce & 0xff); |
463 | debounce >>= 8; |
464 | message[2] = (debounce & 0x03); |
465 | |
466 | return twl_i2c_write(mod_no: TWL4030_MODULE_GPIO, value: message, |
467 | REG_GPIO_DEBEN1, num_bytes: 3); |
468 | } |
469 | |
470 | static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev) |
471 | { |
472 | struct twl4030_gpio_platform_data *omap_twl_info; |
473 | |
474 | omap_twl_info = devm_kzalloc(dev, size: sizeof(*omap_twl_info), GFP_KERNEL); |
475 | if (!omap_twl_info) |
476 | return NULL; |
477 | |
478 | omap_twl_info->use_leds = of_property_read_bool(np: dev->of_node, |
479 | propname: "ti,use-leds" ); |
480 | |
481 | of_property_read_u32(np: dev->of_node, propname: "ti,debounce" , |
482 | out_value: &omap_twl_info->debounce); |
483 | of_property_read_u32(np: dev->of_node, propname: "ti,mmc-cd" , |
484 | out_value: (u32 *)&omap_twl_info->mmc_cd); |
485 | of_property_read_u32(np: dev->of_node, propname: "ti,pullups" , |
486 | out_value: &omap_twl_info->pullups); |
487 | of_property_read_u32(np: dev->of_node, propname: "ti,pulldowns" , |
488 | out_value: &omap_twl_info->pulldowns); |
489 | |
490 | return omap_twl_info; |
491 | } |
492 | |
493 | /* Called from the registered devm action */ |
494 | static void gpio_twl4030_power_off_action(void *data) |
495 | { |
496 | struct gpio_desc *d = data; |
497 | |
498 | gpiod_unexport(desc: d); |
499 | gpiochip_free_own_desc(desc: d); |
500 | } |
501 | |
502 | static int gpio_twl4030_probe(struct platform_device *pdev) |
503 | { |
504 | struct twl4030_gpio_platform_data *pdata; |
505 | struct device_node *node = pdev->dev.of_node; |
506 | struct gpio_twl4030_priv *priv; |
507 | int ret, irq_base; |
508 | |
509 | priv = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct gpio_twl4030_priv), |
510 | GFP_KERNEL); |
511 | if (!priv) |
512 | return -ENOMEM; |
513 | |
514 | /* maybe setup IRQs */ |
515 | if (is_module()) { |
516 | dev_err(&pdev->dev, "can't dispatch IRQs from modules\n" ); |
517 | goto no_irqs; |
518 | } |
519 | |
520 | irq_base = devm_irq_alloc_descs(&pdev->dev, -1, |
521 | 0, TWL4030_GPIO_MAX, 0); |
522 | if (irq_base < 0) { |
523 | dev_err(&pdev->dev, "Failed to alloc irq_descs\n" ); |
524 | return irq_base; |
525 | } |
526 | |
527 | irq_domain_add_legacy(of_node: node, TWL4030_GPIO_MAX, first_irq: irq_base, first_hwirq: 0, |
528 | ops: &irq_domain_simple_ops, NULL); |
529 | |
530 | ret = twl4030_sih_setup(dev: &pdev->dev, module: TWL4030_MODULE_GPIO, irq_base); |
531 | if (ret < 0) |
532 | return ret; |
533 | |
534 | priv->irq_base = irq_base; |
535 | |
536 | no_irqs: |
537 | priv->gpio_chip = template_chip; |
538 | priv->gpio_chip.base = -1; |
539 | priv->gpio_chip.ngpio = TWL4030_GPIO_MAX; |
540 | priv->gpio_chip.parent = &pdev->dev; |
541 | |
542 | mutex_init(&priv->mutex); |
543 | |
544 | pdata = of_gpio_twl4030(dev: &pdev->dev); |
545 | if (pdata == NULL) { |
546 | dev_err(&pdev->dev, "Platform data is missing\n" ); |
547 | return -ENXIO; |
548 | } |
549 | |
550 | /* |
551 | * NOTE: boards may waste power if they don't set pullups |
552 | * and pulldowns correctly ... default for non-ULPI pins is |
553 | * pulldown, and some other pins may have external pullups |
554 | * or pulldowns. Careful! |
555 | */ |
556 | ret = gpio_twl4030_pulls(ups: pdata->pullups, downs: pdata->pulldowns); |
557 | if (ret) |
558 | dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n" , |
559 | pdata->pullups, pdata->pulldowns, ret); |
560 | |
561 | ret = gpio_twl4030_debounce(debounce: pdata->debounce, mmc_cd: pdata->mmc_cd); |
562 | if (ret) |
563 | dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n" , |
564 | pdata->debounce, pdata->mmc_cd, ret); |
565 | |
566 | /* |
567 | * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE, |
568 | * is (still) clear if use_leds is set. |
569 | */ |
570 | if (pdata->use_leds) |
571 | priv->gpio_chip.ngpio += 2; |
572 | |
573 | ret = devm_gpiochip_add_data(&pdev->dev, &priv->gpio_chip, priv); |
574 | if (ret < 0) { |
575 | dev_err(&pdev->dev, "could not register gpiochip, %d\n" , ret); |
576 | priv->gpio_chip.ngpio = 0; |
577 | return ret; |
578 | } |
579 | |
580 | /* |
581 | * Special quirk for the OMAP3 to hog and export a WLAN power |
582 | * GPIO. |
583 | */ |
584 | if (IS_ENABLED(CONFIG_ARCH_OMAP3) && |
585 | of_machine_is_compatible(compat: "compulab,omap3-sbc-t3730" )) { |
586 | struct gpio_desc *d; |
587 | |
588 | d = gpiochip_request_own_desc(gc: &priv->gpio_chip, |
589 | hwnum: 2, label: "wlan pwr" , |
590 | lflags: GPIO_ACTIVE_HIGH, |
591 | dflags: GPIOD_OUT_HIGH); |
592 | if (IS_ERR(ptr: d)) |
593 | return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: d), |
594 | fmt: "unable to hog wlan pwr GPIO\n" ); |
595 | |
596 | gpiod_export(desc: d, direction_may_change: 0); |
597 | |
598 | ret = devm_add_action_or_reset(&pdev->dev, gpio_twl4030_power_off_action, d); |
599 | if (ret) |
600 | return dev_err_probe(dev: &pdev->dev, err: ret, |
601 | fmt: "failed to install power off handler\n" ); |
602 | |
603 | } |
604 | |
605 | return 0; |
606 | } |
607 | |
608 | static const struct of_device_id twl_gpio_match[] = { |
609 | { .compatible = "ti,twl4030-gpio" , }, |
610 | { }, |
611 | }; |
612 | MODULE_DEVICE_TABLE(of, twl_gpio_match); |
613 | |
614 | /* Note: this hardware lives inside an I2C-based multi-function device. */ |
615 | MODULE_ALIAS("platform:twl4030_gpio" ); |
616 | |
617 | static struct platform_driver gpio_twl4030_driver = { |
618 | .driver = { |
619 | .name = "twl4030_gpio" , |
620 | .of_match_table = twl_gpio_match, |
621 | }, |
622 | .probe = gpio_twl4030_probe, |
623 | }; |
624 | |
625 | static int __init gpio_twl4030_init(void) |
626 | { |
627 | return platform_driver_register(&gpio_twl4030_driver); |
628 | } |
629 | subsys_initcall(gpio_twl4030_init); |
630 | |
631 | static void __exit gpio_twl4030_exit(void) |
632 | { |
633 | platform_driver_unregister(&gpio_twl4030_driver); |
634 | } |
635 | module_exit(gpio_twl4030_exit); |
636 | |
637 | MODULE_AUTHOR("Texas Instruments, Inc." ); |
638 | MODULE_DESCRIPTION("GPIO interface for TWL4030" ); |
639 | MODULE_LICENSE("GPL" ); |
640 | |