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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 * The GPIO "subchip" supports 18 GPIOs which can be configured as
42 * inputs or outputs, with pullups or pulldowns on each pin. Each
43 * GPIO can trigger interrupts on either or both edges.
44 *
45 * GPIO interrupts can be fed to either of two IRQ lines; this is
46 * intended to support multiple hosts.
47 *
48 * There are also two LED pins used sometimes as output-only GPIOs.
49 */
50
51/* genirq interfaces are not available to modules */
52#ifdef MODULE
53#define is_module() true
54#else
55#define is_module() false
56#endif
57
58/* GPIO_CTRL Fields */
59#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0)
60#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1)
61#define MASK_GPIO_CTRL_GPIO_ON BIT(2)
62
63/* Mask for GPIO registers when aggregated into a 32-bit integer */
64#define GPIO_32_MASK 0x0003ffff
65
66struct gpio_twl4030_priv {
67 struct gpio_chip gpio_chip;
68 struct mutex mutex;
69 int irq_base;
70
71 /* Bitfields for state caching */
72 unsigned int usage_count;
73 unsigned int direction;
74 unsigned int out_state;
75};
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 from TWL_MODULE_LED base
91 * PWMs A and B are dedicated to LEDs A and B, respectively.
92 */
93
94#define TWL4030_LED_LEDEN_REG 0x00
95#define TWL4030_PWMAON_REG 0x01
96#define TWL4030_PWMAOFF_REG 0x02
97#define TWL4030_PWMBON_REG 0x03
98#define TWL4030_PWMBOFF_REG 0x04
99
100/* LEDEN bits */
101#define LEDEN_LEDAON BIT(0)
102#define LEDEN_LEDBON BIT(1)
103#define LEDEN_LEDAEXT BIT(2)
104#define LEDEN_LEDBEXT BIT(3)
105#define LEDEN_LEDAPWM BIT(4)
106#define LEDEN_LEDBPWM BIT(5)
107#define LEDEN_PWM_LENGTHA BIT(6)
108#define LEDEN_PWM_LENGTHB BIT(7)
109
110#define PWMxON_LENGTH BIT(7)
111
112/*----------------------------------------------------------------------*/
113
114/*
115 * To read a TWL4030 GPIO module register
116 */
117static inline int gpio_twl4030_read(u8 address)
118{
119 u8 data;
120 int ret = 0;
121
122 ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
123 return (ret < 0) ? ret : data;
124}
125
126/*----------------------------------------------------------------------*/
127
128static u8 cached_leden;
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 */
134static void twl4030_led_set_value(int led, int value)
135{
136 u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
137
138 if (led)
139 mask <<= 1;
140
141 if (value)
142 cached_leden &= ~mask;
143 else
144 cached_leden |= mask;
145
146 WARN_ON_ONCE(twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
147 TWL4030_LED_LEDEN_REG));
148}
149
150static int twl4030_set_gpio_direction(int gpio, int is_input)
151{
152 u8 d_bnk = gpio >> 3;
153 u8 d_msk = BIT(gpio & 0x7);
154 u8 reg = 0;
155 u8 base = REG_GPIODATADIR1 + d_bnk;
156 int ret = 0;
157
158 ret = gpio_twl4030_read(base);
159 if (ret >= 0) {
160 if (is_input)
161 reg = ret & ~d_msk;
162 else
163 reg = ret | d_msk;
164
165 ret = gpio_twl4030_write(base, reg);
166 }
167 return ret;
168}
169
170static int twl4030_set_gpio_dataout(int gpio, int enable)
171{
172 u8 d_bnk = gpio >> 3;
173 u8 d_msk = BIT(gpio & 0x7);
174 u8 base = 0;
175
176 if (enable)
177 base = REG_SETGPIODATAOUT1 + d_bnk;
178 else
179 base = REG_CLEARGPIODATAOUT1 + d_bnk;
180
181 return gpio_twl4030_write(base, d_msk);
182}
183
184static int twl4030_get_gpio_datain(int gpio)
185{
186 u8 d_bnk = gpio >> 3;
187 u8 d_off = gpio & 0x7;
188 u8 base = 0;
189 int ret = 0;
190
191 base = REG_GPIODATAIN1 + d_bnk;
192 ret = gpio_twl4030_read(base);
193 if (ret > 0)
194 ret = (ret >> d_off) & 0x1;
195
196 return ret;
197}
198
199/*----------------------------------------------------------------------*/
200
201static int twl_request(struct gpio_chip *chip, unsigned offset)
202{
203 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
204 int status = 0;
205
206 mutex_lock(&priv->mutex);
207
208 /* Support the two LED outputs as output-only GPIOs. */
209 if (offset >= TWL4030_GPIO_MAX) {
210 u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT
211 | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA;
212 u8 reg = TWL4030_PWMAON_REG;
213
214 offset -= TWL4030_GPIO_MAX;
215 if (offset) {
216 ledclr_mask <<= 1;
217 reg = TWL4030_PWMBON_REG;
218 }
219
220 /* initialize PWM to always-drive */
221 /* Configure PWM OFF register first */
222 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg + 1);
223 if (status < 0)
224 goto done;
225
226 /* Followed by PWM ON register */
227 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg);
228 if (status < 0)
229 goto done;
230
231 /* init LED to not-driven (high) */
232 status = twl_i2c_read_u8(TWL4030_MODULE_LED, &cached_leden,
233 TWL4030_LED_LEDEN_REG);
234 if (status < 0)
235 goto done;
236 cached_leden &= ~ledclr_mask;
237 status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
238 TWL4030_LED_LEDEN_REG);
239 if (status < 0)
240 goto done;
241
242 status = 0;
243 goto done;
244 }
245
246 /* on first use, turn GPIO module "on" */
247 if (!priv->usage_count) {
248 struct twl4030_gpio_platform_data *pdata;
249 u8 value = MASK_GPIO_CTRL_GPIO_ON;
250
251 /* optionally have the first two GPIOs switch vMMC1
252 * and vMMC2 power supplies based on card presence.
253 */
254 pdata = dev_get_platdata(chip->parent);
255 if (pdata)
256 value |= pdata->mmc_cd & 0x03;
257
258 status = gpio_twl4030_write(REG_GPIO_CTRL, value);
259 }
260
261done:
262 if (!status)
263 priv->usage_count |= BIT(offset);
264
265 mutex_unlock(&priv->mutex);
266 return status;
267}
268
269static void twl_free(struct gpio_chip *chip, unsigned offset)
270{
271 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
272
273 mutex_lock(&priv->mutex);
274 if (offset >= TWL4030_GPIO_MAX) {
275 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
276 goto out;
277 }
278
279 priv->usage_count &= ~BIT(offset);
280
281 /* on last use, switch off GPIO module */
282 if (!priv->usage_count)
283 gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
284
285out:
286 mutex_unlock(&priv->mutex);
287}
288
289static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
290{
291 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
292 int ret;
293
294 mutex_lock(&priv->mutex);
295 if (offset < TWL4030_GPIO_MAX)
296 ret = twl4030_set_gpio_direction(offset, 1);
297 else
298 ret = -EINVAL; /* LED outputs can't be set as input */
299
300 if (!ret)
301 priv->direction &= ~BIT(offset);
302
303 mutex_unlock(&priv->mutex);
304
305 return ret;
306}
307
308static int twl_get(struct gpio_chip *chip, unsigned offset)
309{
310 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
311 int ret;
312 int status = 0;
313
314 mutex_lock(&priv->mutex);
315 if (!(priv->usage_count & BIT(offset))) {
316 ret = -EPERM;
317 goto out;
318 }
319
320 if (priv->direction & BIT(offset))
321 status = priv->out_state & BIT(offset);
322 else
323 status = twl4030_get_gpio_datain(offset);
324
325 ret = (status < 0) ? status : !!status;
326out:
327 mutex_unlock(&priv->mutex);
328 return ret;
329}
330
331static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
332{
333 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
334
335 mutex_lock(&priv->mutex);
336 if (offset < TWL4030_GPIO_MAX)
337 twl4030_set_gpio_dataout(offset, value);
338 else
339 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
340
341 if (value)
342 priv->out_state |= BIT(offset);
343 else
344 priv->out_state &= ~BIT(offset);
345
346 mutex_unlock(&priv->mutex);
347}
348
349static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
350{
351 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
352 int ret = 0;
353
354 mutex_lock(&priv->mutex);
355 if (offset < TWL4030_GPIO_MAX) {
356 ret = twl4030_set_gpio_direction(offset, 0);
357 if (ret) {
358 mutex_unlock(&priv->mutex);
359 return ret;
360 }
361 }
362
363 /*
364 * LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output
365 */
366
367 priv->direction |= BIT(offset);
368 mutex_unlock(&priv->mutex);
369
370 twl_set(chip, offset, value);
371
372 return ret;
373}
374
375static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
376{
377 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
378
379 return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
380 ? (priv->irq_base + offset)
381 : -EINVAL;
382}
383
384static struct gpio_chip template_chip = {
385 .label = "twl4030",
386 .owner = THIS_MODULE,
387 .request = twl_request,
388 .free = twl_free,
389 .direction_input = twl_direction_in,
390 .get = twl_get,
391 .direction_output = twl_direction_out,
392 .set = twl_set,
393 .to_irq = twl_to_irq,
394 .can_sleep = true,
395};
396
397/*----------------------------------------------------------------------*/
398
399static int gpio_twl4030_pulls(u32 ups, u32 downs)
400{
401 u8 message[5];
402 unsigned i, gpio_bit;
403
404 /* For most pins, a pulldown was enabled by default.
405 * We should have data that's specific to this board.
406 */
407 for (gpio_bit = 1, i = 0; i < 5; i++) {
408 u8 bit_mask;
409 unsigned j;
410
411 for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
412 if (ups & gpio_bit)
413 bit_mask |= 1 << (j + 1);
414 else if (downs & gpio_bit)
415 bit_mask |= 1 << (j + 0);
416 }
417 message[i] = bit_mask;
418 }
419
420 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
421 REG_GPIOPUPDCTR1, 5);
422}
423
424static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
425{
426 u8 message[3];
427
428 /* 30 msec of debouncing is always used for MMC card detect,
429 * and is optional for everything else.
430 */
431 message[0] = (debounce & 0xff) | (mmc_cd & 0x03);
432 debounce >>= 8;
433 message[1] = (debounce & 0xff);
434 debounce >>= 8;
435 message[2] = (debounce & 0x03);
436
437 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
438 REG_GPIO_DEBEN1, 3);
439}
440
441static int gpio_twl4030_remove(struct platform_device *pdev);
442
443static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev,
444 struct twl4030_gpio_platform_data *pdata)
445{
446 struct twl4030_gpio_platform_data *omap_twl_info;
447
448 omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL);
449 if (!omap_twl_info)
450 return NULL;
451
452 if (pdata)
453 *omap_twl_info = *pdata;
454
455 omap_twl_info->use_leds = of_property_read_bool(dev->of_node,
456 "ti,use-leds");
457
458 of_property_read_u32(dev->of_node, "ti,debounce",
459 &omap_twl_info->debounce);
460 of_property_read_u32(dev->of_node, "ti,mmc-cd",
461 (u32 *)&omap_twl_info->mmc_cd);
462 of_property_read_u32(dev->of_node, "ti,pullups",
463 &omap_twl_info->pullups);
464 of_property_read_u32(dev->of_node, "ti,pulldowns",
465 &omap_twl_info->pulldowns);
466
467 return omap_twl_info;
468}
469
470static int gpio_twl4030_probe(struct platform_device *pdev)
471{
472 struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
473 struct device_node *node = pdev->dev.of_node;
474 struct gpio_twl4030_priv *priv;
475 int ret, irq_base;
476
477 priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),
478 GFP_KERNEL);
479 if (!priv)
480 return -ENOMEM;
481
482 /* maybe setup IRQs */
483 if (is_module()) {
484 dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
485 goto no_irqs;
486 }
487
488 irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0);
489 if (irq_base < 0) {
490 dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
491 return irq_base;
492 }
493
494 irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
495 &irq_domain_simple_ops, NULL);
496
497 ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
498 if (ret < 0)
499 return ret;
500
501 priv->irq_base = irq_base;
502
503no_irqs:
504 priv->gpio_chip = template_chip;
505 priv->gpio_chip.base = -1;
506 priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;
507 priv->gpio_chip.parent = &pdev->dev;
508
509 mutex_init(&priv->mutex);
510
511 if (node)
512 pdata = of_gpio_twl4030(&pdev->dev, pdata);
513
514 if (pdata == NULL) {
515 dev_err(&pdev->dev, "Platform data is missing\n");
516 return -ENXIO;
517 }
518
519 /*
520 * NOTE: boards may waste power if they don't set pullups
521 * and pulldowns correctly ... default for non-ULPI pins is
522 * pulldown, and some other pins may have external pullups
523 * or pulldowns. Careful!
524 */
525 ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
526 if (ret)
527 dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
528 pdata->pullups, pdata->pulldowns, ret);
529
530 ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
531 if (ret)
532 dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
533 pdata->debounce, pdata->mmc_cd, ret);
534
535 /*
536 * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
537 * is (still) clear if use_leds is set.
538 */
539 if (pdata->use_leds)
540 priv->gpio_chip.ngpio += 2;
541
542 ret = gpiochip_add_data(&priv->gpio_chip, priv);
543 if (ret < 0) {
544 dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
545 priv->gpio_chip.ngpio = 0;
546 gpio_twl4030_remove(pdev);
547 goto out;
548 }
549
550 platform_set_drvdata(pdev, priv);
551
552 if (pdata->setup) {
553 int status;
554
555 status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
556 TWL4030_GPIO_MAX);
557 if (status)
558 dev_dbg(&pdev->dev, "setup --> %d\n", status);
559 }
560
561out:
562 return ret;
563}
564
565/* Cannot use as gpio_twl4030_probe() calls us */
566static int gpio_twl4030_remove(struct platform_device *pdev)
567{
568 struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
569 struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev);
570 int status;
571
572 if (pdata && pdata->teardown) {
573 status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,
574 TWL4030_GPIO_MAX);
575 if (status) {
576 dev_dbg(&pdev->dev, "teardown --> %d\n", status);
577 return status;
578 }
579 }
580
581 gpiochip_remove(&priv->gpio_chip);
582
583 if (is_module())
584 return 0;
585
586 /* REVISIT no support yet for deregistering all the IRQs */
587 WARN_ON(1);
588 return -EIO;
589}
590
591static const struct of_device_id twl_gpio_match[] = {
592 { .compatible = "ti,twl4030-gpio", },
593 { },
594};
595MODULE_DEVICE_TABLE(of, twl_gpio_match);
596
597/* Note: this hardware lives inside an I2C-based multi-function device. */
598MODULE_ALIAS("platform:twl4030_gpio");
599
600static struct platform_driver gpio_twl4030_driver = {
601 .driver = {
602 .name = "twl4030_gpio",
603 .of_match_table = twl_gpio_match,
604 },
605 .probe = gpio_twl4030_probe,
606 .remove = gpio_twl4030_remove,
607};
608
609static int __init gpio_twl4030_init(void)
610{
611 return platform_driver_register(&gpio_twl4030_driver);
612}
613subsys_initcall(gpio_twl4030_init);
614
615static void __exit gpio_twl4030_exit(void)
616{
617 platform_driver_unregister(&gpio_twl4030_driver);
618}
619module_exit(gpio_twl4030_exit);
620
621MODULE_AUTHOR("Texas Instruments, Inc.");
622MODULE_DESCRIPTION("GPIO interface for TWL4030");
623MODULE_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/mfd/twl.h>
39
40/*
41 * The GPIO "subchip" supports 18 GPIOs which can be configured as
42 * inputs or outputs, with pullups or pulldowns on each pin. Each
43 * GPIO can trigger interrupts on either or both edges.
44 *
45 * GPIO interrupts can be fed to either of two IRQ lines; this is
46 * intended to support multiple hosts.
47 *
48 * There are also two LED pins used sometimes as output-only GPIOs.
49 */
50
51/* genirq interfaces are not available to modules */
52#ifdef MODULE
53#define is_module() true
54#else
55#define is_module() false
56#endif
57
58/* GPIO_CTRL Fields */
59#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0)
60#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1)
61#define MASK_GPIO_CTRL_GPIO_ON BIT(2)
62
63/* Mask for GPIO registers when aggregated into a 32-bit integer */
64#define GPIO_32_MASK 0x0003ffff
65
66struct gpio_twl4030_priv {
67 struct gpio_chip gpio_chip;
68 struct mutex mutex;
69 int irq_base;
70
71 /* Bitfields for state caching */
72 unsigned int usage_count;
73 unsigned int direction;
74 unsigned int out_state;
75};
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 from TWL_MODULE_LED base
91 * PWMs A and B are dedicated to LEDs A and B, respectively.
92 */
93
94#define TWL4030_LED_LEDEN_REG 0x00
95#define TWL4030_PWMAON_REG 0x01
96#define TWL4030_PWMAOFF_REG 0x02
97#define TWL4030_PWMBON_REG 0x03
98#define TWL4030_PWMBOFF_REG 0x04
99
100/* LEDEN bits */
101#define LEDEN_LEDAON BIT(0)
102#define LEDEN_LEDBON BIT(1)
103#define LEDEN_LEDAEXT BIT(2)
104#define LEDEN_LEDBEXT BIT(3)
105#define LEDEN_LEDAPWM BIT(4)
106#define LEDEN_LEDBPWM BIT(5)
107#define LEDEN_PWM_LENGTHA BIT(6)
108#define LEDEN_PWM_LENGTHB BIT(7)
109
110#define PWMxON_LENGTH BIT(7)
111
112/*----------------------------------------------------------------------*/
113
114/*
115 * To read a TWL4030 GPIO module register
116 */
117static inline int gpio_twl4030_read(u8 address)
118{
119 u8 data;
120 int ret = 0;
121
122 ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
123 return (ret < 0) ? ret : data;
124}
125
126/*----------------------------------------------------------------------*/
127
128static u8 cached_leden;
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 */
134static void twl4030_led_set_value(int led, int value)
135{
136 u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
137
138 if (led)
139 mask <<= 1;
140
141 if (value)
142 cached_leden &= ~mask;
143 else
144 cached_leden |= mask;
145
146 WARN_ON_ONCE(twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
147 TWL4030_LED_LEDEN_REG));
148}
149
150static int twl4030_set_gpio_direction(int gpio, int is_input)
151{
152 u8 d_bnk = gpio >> 3;
153 u8 d_msk = BIT(gpio & 0x7);
154 u8 reg = 0;
155 u8 base = REG_GPIODATADIR1 + d_bnk;
156 int ret = 0;
157
158 ret = gpio_twl4030_read(base);
159 if (ret >= 0) {
160 if (is_input)
161 reg = ret & ~d_msk;
162 else
163 reg = ret | d_msk;
164
165 ret = gpio_twl4030_write(base, reg);
166 }
167 return ret;
168}
169
170static int twl4030_set_gpio_dataout(int gpio, int enable)
171{
172 u8 d_bnk = gpio >> 3;
173 u8 d_msk = BIT(gpio & 0x7);
174 u8 base = 0;
175
176 if (enable)
177 base = REG_SETGPIODATAOUT1 + d_bnk;
178 else
179 base = REG_CLEARGPIODATAOUT1 + d_bnk;
180
181 return gpio_twl4030_write(base, d_msk);
182}
183
184static int twl4030_get_gpio_datain(int gpio)
185{
186 u8 d_bnk = gpio >> 3;
187 u8 d_off = gpio & 0x7;
188 u8 base = 0;
189 int ret = 0;
190
191 base = REG_GPIODATAIN1 + d_bnk;
192 ret = gpio_twl4030_read(base);
193 if (ret > 0)
194 ret = (ret >> d_off) & 0x1;
195
196 return ret;
197}
198
199/*----------------------------------------------------------------------*/
200
201static int twl_request(struct gpio_chip *chip, unsigned offset)
202{
203 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
204 int status = 0;
205
206 mutex_lock(&priv->mutex);
207
208 /* Support the two LED outputs as output-only GPIOs. */
209 if (offset >= TWL4030_GPIO_MAX) {
210 u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT
211 | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA;
212 u8 reg = TWL4030_PWMAON_REG;
213
214 offset -= TWL4030_GPIO_MAX;
215 if (offset) {
216 ledclr_mask <<= 1;
217 reg = TWL4030_PWMBON_REG;
218 }
219
220 /* initialize PWM to always-drive */
221 /* Configure PWM OFF register first */
222 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg + 1);
223 if (status < 0)
224 goto done;
225
226 /* Followed by PWM ON register */
227 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg);
228 if (status < 0)
229 goto done;
230
231 /* init LED to not-driven (high) */
232 status = twl_i2c_read_u8(TWL4030_MODULE_LED, &cached_leden,
233 TWL4030_LED_LEDEN_REG);
234 if (status < 0)
235 goto done;
236 cached_leden &= ~ledclr_mask;
237 status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
238 TWL4030_LED_LEDEN_REG);
239 if (status < 0)
240 goto done;
241
242 status = 0;
243 goto done;
244 }
245
246 /* on first use, turn GPIO module "on" */
247 if (!priv->usage_count) {
248 struct twl4030_gpio_platform_data *pdata;
249 u8 value = MASK_GPIO_CTRL_GPIO_ON;
250
251 /* optionally have the first two GPIOs switch vMMC1
252 * and vMMC2 power supplies based on card presence.
253 */
254 pdata = dev_get_platdata(chip->parent);
255 if (pdata)
256 value |= pdata->mmc_cd & 0x03;
257
258 status = gpio_twl4030_write(REG_GPIO_CTRL, value);
259 }
260
261done:
262 if (!status)
263 priv->usage_count |= BIT(offset);
264
265 mutex_unlock(&priv->mutex);
266 return status;
267}
268
269static void twl_free(struct gpio_chip *chip, unsigned offset)
270{
271 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
272
273 mutex_lock(&priv->mutex);
274 if (offset >= TWL4030_GPIO_MAX) {
275 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
276 goto out;
277 }
278
279 priv->usage_count &= ~BIT(offset);
280
281 /* on last use, switch off GPIO module */
282 if (!priv->usage_count)
283 gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
284
285out:
286 mutex_unlock(&priv->mutex);
287}
288
289static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
290{
291 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
292 int ret;
293
294 mutex_lock(&priv->mutex);
295 if (offset < TWL4030_GPIO_MAX)
296 ret = twl4030_set_gpio_direction(offset, 1);
297 else
298 ret = -EINVAL; /* LED outputs can't be set as input */
299
300 if (!ret)
301 priv->direction &= ~BIT(offset);
302
303 mutex_unlock(&priv->mutex);
304
305 return ret;
306}
307
308static int twl_get(struct gpio_chip *chip, unsigned offset)
309{
310 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
311 int ret;
312 int status = 0;
313
314 mutex_lock(&priv->mutex);
315 if (!(priv->usage_count & BIT(offset))) {
316 ret = -EPERM;
317 goto out;
318 }
319
320 if (priv->direction & BIT(offset))
321 status = priv->out_state & BIT(offset);
322 else
323 status = twl4030_get_gpio_datain(offset);
324
325 ret = (status < 0) ? status : !!status;
326out:
327 mutex_unlock(&priv->mutex);
328 return ret;
329}
330
331static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
332{
333 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
334
335 mutex_lock(&priv->mutex);
336 if (offset < TWL4030_GPIO_MAX)
337 twl4030_set_gpio_dataout(offset, value);
338 else
339 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
340
341 if (value)
342 priv->out_state |= BIT(offset);
343 else
344 priv->out_state &= ~BIT(offset);
345
346 mutex_unlock(&priv->mutex);
347}
348
349static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
350{
351 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
352 int ret = 0;
353
354 mutex_lock(&priv->mutex);
355 if (offset < TWL4030_GPIO_MAX) {
356 ret = twl4030_set_gpio_direction(offset, 0);
357 if (ret) {
358 mutex_unlock(&priv->mutex);
359 return ret;
360 }
361 }
362
363 /*
364 * LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output
365 */
366
367 priv->direction |= BIT(offset);
368 mutex_unlock(&priv->mutex);
369
370 twl_set(chip, offset, value);
371
372 return ret;
373}
374
375static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
376{
377 struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
378
379 return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
380 ? (priv->irq_base + offset)
381 : -EINVAL;
382}
383
384static const struct gpio_chip template_chip = {
385 .label = "twl4030",
386 .owner = THIS_MODULE,
387 .request = twl_request,
388 .free = twl_free,
389 .direction_input = twl_direction_in,
390 .get = twl_get,
391 .direction_output = twl_direction_out,
392 .set = twl_set,
393 .to_irq = twl_to_irq,
394 .can_sleep = true,
395};
396
397/*----------------------------------------------------------------------*/
398
399static int gpio_twl4030_pulls(u32 ups, u32 downs)
400{
401 u8 message[5];
402 unsigned i, gpio_bit;
403
404 /* For most pins, a pulldown was enabled by default.
405 * We should have data that's specific to this board.
406 */
407 for (gpio_bit = 1, i = 0; i < 5; i++) {
408 u8 bit_mask;
409 unsigned j;
410
411 for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
412 if (ups & gpio_bit)
413 bit_mask |= 1 << (j + 1);
414 else if (downs & gpio_bit)
415 bit_mask |= 1 << (j + 0);
416 }
417 message[i] = bit_mask;
418 }
419
420 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
421 REG_GPIOPUPDCTR1, 5);
422}
423
424static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
425{
426 u8 message[3];
427
428 /* 30 msec of debouncing is always used for MMC card detect,
429 * and is optional for everything else.
430 */
431 message[0] = (debounce & 0xff) | (mmc_cd & 0x03);
432 debounce >>= 8;
433 message[1] = (debounce & 0xff);
434 debounce >>= 8;
435 message[2] = (debounce & 0x03);
436
437 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
438 REG_GPIO_DEBEN1, 3);
439}
440
441static int gpio_twl4030_remove(struct platform_device *pdev);
442
443static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev,
444 struct twl4030_gpio_platform_data *pdata)
445{
446 struct twl4030_gpio_platform_data *omap_twl_info;
447
448 omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL);
449 if (!omap_twl_info)
450 return NULL;
451
452 if (pdata)
453 *omap_twl_info = *pdata;
454
455 omap_twl_info->use_leds = of_property_read_bool(dev->of_node,
456 "ti,use-leds");
457
458 of_property_read_u32(dev->of_node, "ti,debounce",
459 &omap_twl_info->debounce);
460 of_property_read_u32(dev->of_node, "ti,mmc-cd",
461 (u32 *)&omap_twl_info->mmc_cd);
462 of_property_read_u32(dev->of_node, "ti,pullups",
463 &omap_twl_info->pullups);
464 of_property_read_u32(dev->of_node, "ti,pulldowns",
465 &omap_twl_info->pulldowns);
466
467 return omap_twl_info;
468}
469
470static int gpio_twl4030_probe(struct platform_device *pdev)
471{
472 struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
473 struct device_node *node = pdev->dev.of_node;
474 struct gpio_twl4030_priv *priv;
475 int ret, irq_base;
476
477 priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),
478 GFP_KERNEL);
479 if (!priv)
480 return -ENOMEM;
481
482 /* maybe setup IRQs */
483 if (is_module()) {
484 dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
485 goto no_irqs;
486 }
487
488 irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
489 0, TWL4030_GPIO_MAX, 0);
490 if (irq_base < 0) {
491 dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
492 return irq_base;
493 }
494
495 irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
496 &irq_domain_simple_ops, NULL);
497
498 ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
499 if (ret < 0)
500 return ret;
501
502 priv->irq_base = irq_base;
503
504no_irqs:
505 priv->gpio_chip = template_chip;
506 priv->gpio_chip.base = -1;
507 priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;
508 priv->gpio_chip.parent = &pdev->dev;
509
510 mutex_init(&priv->mutex);
511
512 if (node)
513 pdata = of_gpio_twl4030(&pdev->dev, pdata);
514
515 if (pdata == NULL) {
516 dev_err(&pdev->dev, "Platform data is missing\n");
517 return -ENXIO;
518 }
519
520 /*
521 * NOTE: boards may waste power if they don't set pullups
522 * and pulldowns correctly ... default for non-ULPI pins is
523 * pulldown, and some other pins may have external pullups
524 * or pulldowns. Careful!
525 */
526 ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
527 if (ret)
528 dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
529 pdata->pullups, pdata->pulldowns, ret);
530
531 ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
532 if (ret)
533 dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
534 pdata->debounce, pdata->mmc_cd, ret);
535
536 /*
537 * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
538 * is (still) clear if use_leds is set.
539 */
540 if (pdata->use_leds)
541 priv->gpio_chip.ngpio += 2;
542
543 ret = gpiochip_add_data(&priv->gpio_chip, priv);
544 if (ret < 0) {
545 dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
546 priv->gpio_chip.ngpio = 0;
547 gpio_twl4030_remove(pdev);
548 goto out;
549 }
550
551 platform_set_drvdata(pdev, priv);
552
553 if (pdata->setup) {
554 int status;
555
556 status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
557 TWL4030_GPIO_MAX);
558 if (status)
559 dev_dbg(&pdev->dev, "setup --> %d\n", status);
560 }
561
562out:
563 return ret;
564}
565
566/* Cannot use as gpio_twl4030_probe() calls us */
567static int gpio_twl4030_remove(struct platform_device *pdev)
568{
569 struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
570 struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev);
571 int status;
572
573 if (pdata && pdata->teardown) {
574 status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,
575 TWL4030_GPIO_MAX);
576 if (status) {
577 dev_dbg(&pdev->dev, "teardown --> %d\n", status);
578 return status;
579 }
580 }
581
582 gpiochip_remove(&priv->gpio_chip);
583
584 if (is_module())
585 return 0;
586
587 /* REVISIT no support yet for deregistering all the IRQs */
588 WARN_ON(1);
589 return -EIO;
590}
591
592static const struct of_device_id twl_gpio_match[] = {
593 { .compatible = "ti,twl4030-gpio", },
594 { },
595};
596MODULE_DEVICE_TABLE(of, twl_gpio_match);
597
598/* Note: this hardware lives inside an I2C-based multi-function device. */
599MODULE_ALIAS("platform:twl4030_gpio");
600
601static struct platform_driver gpio_twl4030_driver = {
602 .driver = {
603 .name = "twl4030_gpio",
604 .of_match_table = twl_gpio_match,
605 },
606 .probe = gpio_twl4030_probe,
607 .remove = gpio_twl4030_remove,
608};
609
610static int __init gpio_twl4030_init(void)
611{
612 return platform_driver_register(&gpio_twl4030_driver);
613}
614subsys_initcall(gpio_twl4030_init);
615
616static void __exit gpio_twl4030_exit(void)
617{
618 platform_driver_unregister(&gpio_twl4030_driver);
619}
620module_exit(gpio_twl4030_exit);
621
622MODULE_AUTHOR("Texas Instruments, Inc.");
623MODULE_DESCRIPTION("GPIO interface for TWL4030");
624MODULE_LICENSE("GPL");