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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
55struct 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 */
71static inline int gpio_twl4030_write(u8 address, u8 data)
72{
73 return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, 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 */
106static inline int gpio_twl4030_read(u8 address)
107{
108 u8 data;
109 int ret = 0;
110
111 ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
112 return (ret < 0) ? ret : data;
113}
114
115/*----------------------------------------------------------------------*/
116
117static 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 */
123static 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
139static 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(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(base, reg);
155 }
156 return ret;
157}
158
159static 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(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
176static 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(base, d_msk);
188}
189
190static 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(base);
199 if (ret > 0)
200 ret = (ret >> d_off) & 0x1;
201
202 return ret;
203}
204
205/*----------------------------------------------------------------------*/
206
207static int twl_request(struct gpio_chip *chip, unsigned offset)
208{
209 struct gpio_twl4030_priv *priv = gpiochip_get_data(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, 0x7f, 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, 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, &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, 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(chip->parent);
261 if (pdata)
262 value |= pdata->mmc_cd & 0x03;
263
264 status = gpio_twl4030_write(REG_GPIO_CTRL, value);
265 }
266
267done:
268 if (!status)
269 priv->usage_count |= BIT(offset);
270
271 mutex_unlock(&priv->mutex);
272 return status;
273}
274
275static void twl_free(struct gpio_chip *chip, unsigned offset)
276{
277 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
278
279 mutex_lock(&priv->mutex);
280 if (offset >= TWL4030_GPIO_MAX) {
281 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 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, 0x0);
290
291out:
292 mutex_unlock(&priv->mutex);
293}
294
295static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
296{
297 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
298 int ret;
299
300 mutex_lock(&priv->mutex);
301 if (offset < TWL4030_GPIO_MAX)
302 ret = twl4030_set_gpio_direction(offset, 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(&priv->mutex);
310
311 return ret;
312}
313
314static int twl_get(struct gpio_chip *chip, unsigned offset)
315{
316 struct gpio_twl4030_priv *priv = gpiochip_get_data(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(offset);
330
331 ret = (status < 0) ? status : !!status;
332out:
333 mutex_unlock(&priv->mutex);
334 return ret;
335}
336
337static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
338{
339 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
340
341 mutex_lock(&priv->mutex);
342 if (offset < TWL4030_GPIO_MAX)
343 twl4030_set_gpio_dataout(offset, value);
344 else
345 twl4030_led_set_value(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(&priv->mutex);
353}
354
355static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
356{
357 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
358 int ret = 0;
359
360 mutex_lock(&priv->mutex);
361 if (offset < TWL4030_GPIO_MAX) {
362 ret = twl4030_set_gpio_direction(offset, 0);
363 if (ret) {
364 mutex_unlock(&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(&priv->mutex);
375
376 twl_set(chip, offset, value);
377
378 return ret;
379}
380
381static int twl_get_direction(struct gpio_chip *chip, unsigned offset)
382{
383 struct gpio_twl4030_priv *priv = gpiochip_get_data(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(offset);
393 if (ret) {
394 mutex_unlock(&priv->mutex);
395 return ret;
396 }
397 }
398 mutex_unlock(&priv->mutex);
399
400 return ret;
401}
402
403static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
404{
405 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
406
407 return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
408 ? (priv->irq_base + offset)
409 : -EINVAL;
410}
411
412static 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
428static 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(TWL4030_MODULE_GPIO, message,
450 REG_GPIOPUPDCTR1, 5);
451}
452
453static 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(TWL4030_MODULE_GPIO, message,
467 REG_GPIO_DEBEN1, 3);
468}
469
470static 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, 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(dev->of_node,
479 "ti,use-leds");
480
481 of_property_read_u32(dev->of_node, "ti,debounce",
482 &omap_twl_info->debounce);
483 of_property_read_u32(dev->of_node, "ti,mmc-cd",
484 (u32 *)&omap_twl_info->mmc_cd);
485 of_property_read_u32(dev->of_node, "ti,pullups",
486 &omap_twl_info->pullups);
487 of_property_read_u32(dev->of_node, "ti,pulldowns",
488 &omap_twl_info->pulldowns);
489
490 return omap_twl_info;
491}
492
493/* Called from the registered devm action */
494static void gpio_twl4030_power_off_action(void *data)
495{
496 struct gpio_desc *d = data;
497
498 gpiod_unexport(d);
499 gpiochip_free_own_desc(d);
500}
501
502static 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(&pdev->dev, 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(node, TWL4030_GPIO_MAX, irq_base, 0,
528 &irq_domain_simple_ops, NULL);
529
530 ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
531 if (ret < 0)
532 return ret;
533
534 priv->irq_base = irq_base;
535
536no_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(&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(pdata->pullups, 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(pdata->debounce, 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("compulab,omap3-sbc-t3730")) {
586 struct gpio_desc *d;
587
588 d = gpiochip_request_own_desc(&priv->gpio_chip,
589 2, "wlan pwr",
590 GPIO_ACTIVE_HIGH,
591 GPIOD_OUT_HIGH);
592 if (IS_ERR(d))
593 return dev_err_probe(&pdev->dev, PTR_ERR(d),
594 "unable to hog wlan pwr GPIO\n");
595
596 gpiod_export(d, 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(&pdev->dev, ret,
601 "failed to install power off handler\n");
602
603 }
604
605 return 0;
606}
607
608static const struct of_device_id twl_gpio_match[] = {
609 { .compatible = "ti,twl4030-gpio", },
610 { },
611};
612MODULE_DEVICE_TABLE(of, twl_gpio_match);
613
614/* Note: this hardware lives inside an I2C-based multi-function device. */
615MODULE_ALIAS("platform:twl4030_gpio");
616
617static 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
625static int __init gpio_twl4030_init(void)
626{
627 return platform_driver_register(&gpio_twl4030_driver);
628}
629subsys_initcall(gpio_twl4030_init);
630
631static void __exit gpio_twl4030_exit(void)
632{
633 platform_driver_unregister(&gpio_twl4030_driver);
634}
635module_exit(gpio_twl4030_exit);
636
637MODULE_AUTHOR("Texas Instruments, Inc.");
638MODULE_DESCRIPTION("GPIO interface for TWL4030");
639MODULE_LICENSE("GPL");
1/*
2 * Access to GPIOs on TWL4030/TPS659x0 chips
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>
35#include <linux/of.h>
36#include <linux/irqdomain.h>
37
38#include <linux/i2c/twl.h>
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
53static struct gpio_chip twl_gpiochip;
54static int twl4030_gpio_irq_base;
55
56/* genirq interfaces are not available to modules */
57#ifdef MODULE
58#define is_module() true
59#else
60#define is_module() false
61#endif
62
63/* GPIO_CTRL Fields */
64#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0)
65#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1)
66#define MASK_GPIO_CTRL_GPIO_ON BIT(2)
67
68/* Mask for GPIO registers when aggregated into a 32-bit integer */
69#define GPIO_32_MASK 0x0003ffff
70
71/* Data structures */
72static DEFINE_MUTEX(gpio_lock);
73
74/* store usage of each GPIO. - each bit represents one GPIO */
75static unsigned int gpio_usage_count;
76
77/*----------------------------------------------------------------------*/
78
79/*
80 * To configure TWL4030 GPIO module registers
81 */
82static inline int gpio_twl4030_write(u8 address, u8 data)
83{
84 return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);
85}
86
87/*----------------------------------------------------------------------*/
88
89/*
90 * LED register offsets (use TWL4030_MODULE_{LED,PWMA,PWMB}))
91 * PWMs A and B are dedicated to LEDs A and B, respectively.
92 */
93
94#define TWL4030_LED_LEDEN 0x0
95
96/* LEDEN bits */
97#define LEDEN_LEDAON BIT(0)
98#define LEDEN_LEDBON BIT(1)
99#define LEDEN_LEDAEXT BIT(2)
100#define LEDEN_LEDBEXT BIT(3)
101#define LEDEN_LEDAPWM BIT(4)
102#define LEDEN_LEDBPWM BIT(5)
103#define LEDEN_PWM_LENGTHA BIT(6)
104#define LEDEN_PWM_LENGTHB BIT(7)
105
106#define TWL4030_PWMx_PWMxON 0x0
107#define TWL4030_PWMx_PWMxOFF 0x1
108
109#define PWMxON_LENGTH BIT(7)
110
111/*----------------------------------------------------------------------*/
112
113/*
114 * To read a TWL4030 GPIO module register
115 */
116static inline int gpio_twl4030_read(u8 address)
117{
118 u8 data;
119 int ret = 0;
120
121 ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
122 return (ret < 0) ? ret : data;
123}
124
125/*----------------------------------------------------------------------*/
126
127static u8 cached_leden; /* protected by gpio_lock */
128
129/* The LED lines are open drain outputs ... a FET pulls to GND, so an
130 * external pullup is needed. We could also expose the integrated PWM
131 * as a LED brightness control; we initialize it as "always on".
132 */
133static void twl4030_led_set_value(int led, int value)
134{
135 u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
136 int status;
137
138 if (led)
139 mask <<= 1;
140
141 mutex_lock(&gpio_lock);
142 if (value)
143 cached_leden &= ~mask;
144 else
145 cached_leden |= mask;
146 status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
147 TWL4030_LED_LEDEN);
148 mutex_unlock(&gpio_lock);
149}
150
151static int twl4030_set_gpio_direction(int gpio, int is_input)
152{
153 u8 d_bnk = gpio >> 3;
154 u8 d_msk = BIT(gpio & 0x7);
155 u8 reg = 0;
156 u8 base = REG_GPIODATADIR1 + d_bnk;
157 int ret = 0;
158
159 mutex_lock(&gpio_lock);
160 ret = gpio_twl4030_read(base);
161 if (ret >= 0) {
162 if (is_input)
163 reg = ret & ~d_msk;
164 else
165 reg = ret | d_msk;
166
167 ret = gpio_twl4030_write(base, reg);
168 }
169 mutex_unlock(&gpio_lock);
170 return ret;
171}
172
173static int twl4030_set_gpio_dataout(int gpio, int enable)
174{
175 u8 d_bnk = gpio >> 3;
176 u8 d_msk = BIT(gpio & 0x7);
177 u8 base = 0;
178
179 if (enable)
180 base = REG_SETGPIODATAOUT1 + d_bnk;
181 else
182 base = REG_CLEARGPIODATAOUT1 + d_bnk;
183
184 return gpio_twl4030_write(base, d_msk);
185}
186
187static int twl4030_get_gpio_datain(int gpio)
188{
189 u8 d_bnk = gpio >> 3;
190 u8 d_off = gpio & 0x7;
191 u8 base = 0;
192 int ret = 0;
193
194 if (unlikely((gpio >= TWL4030_GPIO_MAX)
195 || !(gpio_usage_count & BIT(gpio))))
196 return -EPERM;
197
198 base = REG_GPIODATAIN1 + d_bnk;
199 ret = gpio_twl4030_read(base);
200 if (ret > 0)
201 ret = (ret >> d_off) & 0x1;
202
203 return ret;
204}
205
206/*----------------------------------------------------------------------*/
207
208static int twl_request(struct gpio_chip *chip, unsigned offset)
209{
210 int status = 0;
211
212 mutex_lock(&gpio_lock);
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 module = TWL4030_MODULE_PWMA;
219
220 offset -= TWL4030_GPIO_MAX;
221 if (offset) {
222 ledclr_mask <<= 1;
223 module = TWL4030_MODULE_PWMB;
224 }
225
226 /* initialize PWM to always-drive */
227 status = twl_i2c_write_u8(module, 0x7f,
228 TWL4030_PWMx_PWMxOFF);
229 if (status < 0)
230 goto done;
231 status = twl_i2c_write_u8(module, 0x7f,
232 TWL4030_PWMx_PWMxON);
233 if (status < 0)
234 goto done;
235
236 /* init LED to not-driven (high) */
237 module = TWL4030_MODULE_LED;
238 status = twl_i2c_read_u8(module, &cached_leden,
239 TWL4030_LED_LEDEN);
240 if (status < 0)
241 goto done;
242 cached_leden &= ~ledclr_mask;
243 status = twl_i2c_write_u8(module, cached_leden,
244 TWL4030_LED_LEDEN);
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 (!gpio_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 = chip->dev->platform_data;
261 if (pdata)
262 value |= pdata->mmc_cd & 0x03;
263
264 status = gpio_twl4030_write(REG_GPIO_CTRL, value);
265 }
266
267 if (!status)
268 gpio_usage_count |= (0x1 << offset);
269
270done:
271 mutex_unlock(&gpio_lock);
272 return status;
273}
274
275static void twl_free(struct gpio_chip *chip, unsigned offset)
276{
277 if (offset >= TWL4030_GPIO_MAX) {
278 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
279 return;
280 }
281
282 mutex_lock(&gpio_lock);
283
284 gpio_usage_count &= ~BIT(offset);
285
286 /* on last use, switch off GPIO module */
287 if (!gpio_usage_count)
288 gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
289
290 mutex_unlock(&gpio_lock);
291}
292
293static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
294{
295 return (offset < TWL4030_GPIO_MAX)
296 ? twl4030_set_gpio_direction(offset, 1)
297 : -EINVAL;
298}
299
300static int twl_get(struct gpio_chip *chip, unsigned offset)
301{
302 int status = 0;
303
304 if (offset < TWL4030_GPIO_MAX)
305 status = twl4030_get_gpio_datain(offset);
306 else if (offset == TWL4030_GPIO_MAX)
307 status = cached_leden & LEDEN_LEDAON;
308 else
309 status = cached_leden & LEDEN_LEDBON;
310 return (status < 0) ? 0 : status;
311}
312
313static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
314{
315 if (offset < TWL4030_GPIO_MAX) {
316 twl4030_set_gpio_dataout(offset, value);
317 return twl4030_set_gpio_direction(offset, 0);
318 } else {
319 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
320 return 0;
321 }
322}
323
324static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
325{
326 if (offset < TWL4030_GPIO_MAX)
327 twl4030_set_gpio_dataout(offset, value);
328 else
329 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
330}
331
332static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
333{
334 return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX))
335 ? (twl4030_gpio_irq_base + offset)
336 : -EINVAL;
337}
338
339static struct gpio_chip twl_gpiochip = {
340 .label = "twl4030",
341 .owner = THIS_MODULE,
342 .request = twl_request,
343 .free = twl_free,
344 .direction_input = twl_direction_in,
345 .get = twl_get,
346 .direction_output = twl_direction_out,
347 .set = twl_set,
348 .to_irq = twl_to_irq,
349 .can_sleep = 1,
350};
351
352/*----------------------------------------------------------------------*/
353
354static int __devinit gpio_twl4030_pulls(u32 ups, u32 downs)
355{
356 u8 message[6];
357 unsigned i, gpio_bit;
358
359 /* For most pins, a pulldown was enabled by default.
360 * We should have data that's specific to this board.
361 */
362 for (gpio_bit = 1, i = 1; i < 6; i++) {
363 u8 bit_mask;
364 unsigned j;
365
366 for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
367 if (ups & gpio_bit)
368 bit_mask |= 1 << (j + 1);
369 else if (downs & gpio_bit)
370 bit_mask |= 1 << (j + 0);
371 }
372 message[i] = bit_mask;
373 }
374
375 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
376 REG_GPIOPUPDCTR1, 5);
377}
378
379static int __devinit gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
380{
381 u8 message[4];
382
383 /* 30 msec of debouncing is always used for MMC card detect,
384 * and is optional for everything else.
385 */
386 message[1] = (debounce & 0xff) | (mmc_cd & 0x03);
387 debounce >>= 8;
388 message[2] = (debounce & 0xff);
389 debounce >>= 8;
390 message[3] = (debounce & 0x03);
391
392 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
393 REG_GPIO_DEBEN1, 3);
394}
395
396static int gpio_twl4030_remove(struct platform_device *pdev);
397
398static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
399{
400 struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
401 struct device_node *node = pdev->dev.of_node;
402 int ret, irq_base;
403
404 /* maybe setup IRQs */
405 if (is_module()) {
406 dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
407 goto no_irqs;
408 }
409
410 irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0);
411 if (irq_base < 0) {
412 dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
413 return irq_base;
414 }
415
416 irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
417 &irq_domain_simple_ops, NULL);
418
419 ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
420 if (ret < 0)
421 return ret;
422
423 twl4030_gpio_irq_base = irq_base;
424
425no_irqs:
426 twl_gpiochip.base = -1;
427 twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
428 twl_gpiochip.dev = &pdev->dev;
429
430 if (pdata) {
431 twl_gpiochip.base = pdata->gpio_base;
432
433 /*
434 * NOTE: boards may waste power if they don't set pullups
435 * and pulldowns correctly ... default for non-ULPI pins is
436 * pulldown, and some other pins may have external pullups
437 * or pulldowns. Careful!
438 */
439 ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
440 if (ret)
441 dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
442 pdata->pullups, pdata->pulldowns,
443 ret);
444
445 ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
446 if (ret)
447 dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
448 pdata->debounce, pdata->mmc_cd,
449 ret);
450
451 /*
452 * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
453 * is (still) clear if use_leds is set.
454 */
455 if (pdata->use_leds)
456 twl_gpiochip.ngpio += 2;
457 }
458
459 ret = gpiochip_add(&twl_gpiochip);
460 if (ret < 0) {
461 dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
462 twl_gpiochip.ngpio = 0;
463 gpio_twl4030_remove(pdev);
464 } else if (pdata && pdata->setup) {
465 int status;
466
467 status = pdata->setup(&pdev->dev,
468 pdata->gpio_base, TWL4030_GPIO_MAX);
469 if (status)
470 dev_dbg(&pdev->dev, "setup --> %d\n", status);
471 }
472
473 return ret;
474}
475
476/* Cannot use __devexit as gpio_twl4030_probe() calls us */
477static int gpio_twl4030_remove(struct platform_device *pdev)
478{
479 struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
480 int status;
481
482 if (pdata && pdata->teardown) {
483 status = pdata->teardown(&pdev->dev,
484 pdata->gpio_base, TWL4030_GPIO_MAX);
485 if (status) {
486 dev_dbg(&pdev->dev, "teardown --> %d\n", status);
487 return status;
488 }
489 }
490
491 status = gpiochip_remove(&twl_gpiochip);
492 if (status < 0)
493 return status;
494
495 if (is_module())
496 return 0;
497
498 /* REVISIT no support yet for deregistering all the IRQs */
499 WARN_ON(1);
500 return -EIO;
501}
502
503static const struct of_device_id twl_gpio_match[] = {
504 { .compatible = "ti,twl4030-gpio", },
505 { },
506};
507MODULE_DEVICE_TABLE(of, twl_gpio_match);
508
509/* Note: this hardware lives inside an I2C-based multi-function device. */
510MODULE_ALIAS("platform:twl4030_gpio");
511
512static struct platform_driver gpio_twl4030_driver = {
513 .driver = {
514 .name = "twl4030_gpio",
515 .owner = THIS_MODULE,
516 .of_match_table = of_match_ptr(twl_gpio_match),
517 },
518 .probe = gpio_twl4030_probe,
519 .remove = gpio_twl4030_remove,
520};
521
522static int __init gpio_twl4030_init(void)
523{
524 return platform_driver_register(&gpio_twl4030_driver);
525}
526subsys_initcall(gpio_twl4030_init);
527
528static void __exit gpio_twl4030_exit(void)
529{
530 platform_driver_unregister(&gpio_twl4030_driver);
531}
532module_exit(gpio_twl4030_exit);
533
534MODULE_AUTHOR("Texas Instruments, Inc.");
535MODULE_DESCRIPTION("GPIO interface for TWL4030");
536MODULE_LICENSE("GPL");