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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
43
44
45
46
47
48
49
50
51
52#ifdef MODULE
53#define is_module() true
54#else
55#define is_module() false
56#endif
57
58
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
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
72 unsigned int usage_count;
73 unsigned int direction;
74 unsigned int out_state;
75};
76
77
78
79static inline struct gpio_twl4030_priv *to_gpio_twl4030(struct gpio_chip *chip)
80{
81 return container_of(chip, struct gpio_twl4030_priv, gpio_chip);
82}
83
84
85
86
87static inline int gpio_twl4030_write(u8 address, u8 data)
88{
89 return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);
90}
91
92
93
94
95
96
97
98
99#define TWL4030_LED_LEDEN_REG 0x00
100#define TWL4030_PWMAON_REG 0x01
101#define TWL4030_PWMAOFF_REG 0x02
102#define TWL4030_PWMBON_REG 0x03
103#define TWL4030_PWMBOFF_REG 0x04
104
105
106#define LEDEN_LEDAON BIT(0)
107#define LEDEN_LEDBON BIT(1)
108#define LEDEN_LEDAEXT BIT(2)
109#define LEDEN_LEDBEXT BIT(3)
110#define LEDEN_LEDAPWM BIT(4)
111#define LEDEN_LEDBPWM BIT(5)
112#define LEDEN_PWM_LENGTHA BIT(6)
113#define LEDEN_PWM_LENGTHB BIT(7)
114
115#define PWMxON_LENGTH BIT(7)
116
117
118
119
120
121
122static inline int gpio_twl4030_read(u8 address)
123{
124 u8 data;
125 int ret = 0;
126
127 ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
128 return (ret < 0) ? ret : data;
129}
130
131
132
133static u8 cached_leden;
134
135
136
137
138
139static void twl4030_led_set_value(int led, int value)
140{
141 u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
142 int status;
143
144 if (led)
145 mask <<= 1;
146
147 if (value)
148 cached_leden &= ~mask;
149 else
150 cached_leden |= mask;
151 status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
152 TWL4030_LED_LEDEN_REG);
153}
154
155static int twl4030_set_gpio_direction(int gpio, int is_input)
156{
157 u8 d_bnk = gpio >> 3;
158 u8 d_msk = BIT(gpio & 0x7);
159 u8 reg = 0;
160 u8 base = REG_GPIODATADIR1 + d_bnk;
161 int ret = 0;
162
163 ret = gpio_twl4030_read(base);
164 if (ret >= 0) {
165 if (is_input)
166 reg = ret & ~d_msk;
167 else
168 reg = ret | d_msk;
169
170 ret = gpio_twl4030_write(base, reg);
171 }
172 return ret;
173}
174
175static int twl4030_set_gpio_dataout(int gpio, int enable)
176{
177 u8 d_bnk = gpio >> 3;
178 u8 d_msk = BIT(gpio & 0x7);
179 u8 base = 0;
180
181 if (enable)
182 base = REG_SETGPIODATAOUT1 + d_bnk;
183 else
184 base = REG_CLEARGPIODATAOUT1 + d_bnk;
185
186 return gpio_twl4030_write(base, d_msk);
187}
188
189static int twl4030_get_gpio_datain(int gpio)
190{
191 u8 d_bnk = gpio >> 3;
192 u8 d_off = gpio & 0x7;
193 u8 base = 0;
194 int ret = 0;
195
196 base = REG_GPIODATAIN1 + d_bnk;
197 ret = gpio_twl4030_read(base);
198 if (ret > 0)
199 ret = (ret >> d_off) & 0x1;
200
201 return ret;
202}
203
204
205
206static int twl_request(struct gpio_chip *chip, unsigned offset)
207{
208 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
209 int status = 0;
210
211 mutex_lock(&priv->mutex);
212
213
214 if (offset >= TWL4030_GPIO_MAX) {
215 u8 ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT
216 | LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA;
217 u8 reg = TWL4030_PWMAON_REG;
218
219 offset -= TWL4030_GPIO_MAX;
220 if (offset) {
221 ledclr_mask <<= 1;
222 reg = TWL4030_PWMBON_REG;
223 }
224
225
226
227 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg + 1);
228 if (status < 0)
229 goto done;
230
231
232 status = twl_i2c_write_u8(TWL4030_MODULE_LED, 0x7f, reg);
233 if (status < 0)
234 goto done;
235
236
237 status = twl_i2c_read_u8(TWL4030_MODULE_LED, &cached_leden,
238 TWL4030_LED_LEDEN_REG);
239 if (status < 0)
240 goto done;
241 cached_leden &= ~ledclr_mask;
242 status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
243 TWL4030_LED_LEDEN_REG);
244 if (status < 0)
245 goto done;
246
247 status = 0;
248 goto done;
249 }
250
251
252 if (!priv->usage_count) {
253 struct twl4030_gpio_platform_data *pdata;
254 u8 value = MASK_GPIO_CTRL_GPIO_ON;
255
256
257
258
259 pdata = chip->dev->platform_data;
260 if (pdata)
261 value |= pdata->mmc_cd & 0x03;
262
263 status = gpio_twl4030_write(REG_GPIO_CTRL, value);
264 }
265
266done:
267 if (!status)
268 priv->usage_count |= BIT(offset);
269
270 mutex_unlock(&priv->mutex);
271 return status;
272}
273
274static void twl_free(struct gpio_chip *chip, unsigned offset)
275{
276 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
277
278 mutex_lock(&priv->mutex);
279 if (offset >= TWL4030_GPIO_MAX) {
280 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
281 goto out;
282 }
283
284 priv->usage_count &= ~BIT(offset);
285
286
287 if (!priv->usage_count)
288 gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
289
290out:
291 mutex_unlock(&priv->mutex);
292}
293
294static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
295{
296 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
297 int ret;
298
299 mutex_lock(&priv->mutex);
300 if (offset < TWL4030_GPIO_MAX)
301 ret = twl4030_set_gpio_direction(offset, 1);
302 else
303 ret = -EINVAL;
304
305 if (!ret)
306 priv->direction &= ~BIT(offset);
307
308 mutex_unlock(&priv->mutex);
309
310 return ret;
311}
312
313static int twl_get(struct gpio_chip *chip, unsigned offset)
314{
315 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
316 int ret;
317 int status = 0;
318
319 mutex_lock(&priv->mutex);
320 if (!(priv->usage_count & BIT(offset))) {
321 ret = -EPERM;
322 goto out;
323 }
324
325 if (priv->direction & BIT(offset))
326 status = priv->out_state & BIT(offset);
327 else
328 status = twl4030_get_gpio_datain(offset);
329
330 ret = (status <= 0) ? 0 : 1;
331out:
332 mutex_unlock(&priv->mutex);
333 return ret;
334}
335
336static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
337{
338 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
339
340 mutex_lock(&priv->mutex);
341 if (offset < TWL4030_GPIO_MAX)
342 twl4030_set_gpio_dataout(offset, value);
343 else
344 twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
345
346 if (value)
347 priv->out_state |= BIT(offset);
348 else
349 priv->out_state &= ~BIT(offset);
350
351 mutex_unlock(&priv->mutex);
352}
353
354static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
355{
356 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
357
358 mutex_lock(&priv->mutex);
359 if (offset < TWL4030_GPIO_MAX)
360 twl4030_set_gpio_dataout(offset, value);
361
362 priv->direction |= BIT(offset);
363 mutex_unlock(&priv->mutex);
364
365 twl_set(chip, offset, value);
366
367 return 0;
368}
369
370static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
371{
372 struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
373
374 return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
375 ? (priv->irq_base + offset)
376 : -EINVAL;
377}
378
379static struct gpio_chip template_chip = {
380 .label = "twl4030",
381 .owner = THIS_MODULE,
382 .request = twl_request,
383 .free = twl_free,
384 .direction_input = twl_direction_in,
385 .get = twl_get,
386 .direction_output = twl_direction_out,
387 .set = twl_set,
388 .to_irq = twl_to_irq,
389 .can_sleep = 1,
390};
391
392
393
394static int gpio_twl4030_pulls(u32 ups, u32 downs)
395{
396 u8 message[5];
397 unsigned i, gpio_bit;
398
399
400
401
402 for (gpio_bit = 1, i = 0; i < 5; i++) {
403 u8 bit_mask;
404 unsigned j;
405
406 for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
407 if (ups & gpio_bit)
408 bit_mask |= 1 << (j + 1);
409 else if (downs & gpio_bit)
410 bit_mask |= 1 << (j + 0);
411 }
412 message[i] = bit_mask;
413 }
414
415 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
416 REG_GPIOPUPDCTR1, 5);
417}
418
419static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
420{
421 u8 message[3];
422
423
424
425
426 message[0] = (debounce & 0xff) | (mmc_cd & 0x03);
427 debounce >>= 8;
428 message[1] = (debounce & 0xff);
429 debounce >>= 8;
430 message[2] = (debounce & 0x03);
431
432 return twl_i2c_write(TWL4030_MODULE_GPIO, message,
433 REG_GPIO_DEBEN1, 3);
434}
435
436static int gpio_twl4030_remove(struct platform_device *pdev);
437
438static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev)
439{
440 struct twl4030_gpio_platform_data *omap_twl_info;
441
442 omap_twl_info = devm_kzalloc(dev, sizeof(*omap_twl_info), GFP_KERNEL);
443 if (!omap_twl_info)
444 return NULL;
445
446 omap_twl_info->use_leds = of_property_read_bool(dev->of_node,
447 "ti,use-leds");
448
449 of_property_read_u32(dev->of_node, "ti,debounce",
450 &omap_twl_info->debounce);
451 of_property_read_u32(dev->of_node, "ti,mmc-cd",
452 (u32 *)&omap_twl_info->mmc_cd);
453 of_property_read_u32(dev->of_node, "ti,pullups",
454 &omap_twl_info->pullups);
455 of_property_read_u32(dev->of_node, "ti,pulldowns",
456 &omap_twl_info->pulldowns);
457
458 return omap_twl_info;
459}
460
461static int gpio_twl4030_probe(struct platform_device *pdev)
462{
463 struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
464 struct device_node *node = pdev->dev.of_node;
465 struct gpio_twl4030_priv *priv;
466 int ret, irq_base;
467
468 priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),
469 GFP_KERNEL);
470 if (!priv)
471 return -ENOMEM;
472
473
474 if (is_module()) {
475 dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
476 goto no_irqs;
477 }
478
479 irq_base = irq_alloc_descs(-1, 0, TWL4030_GPIO_MAX, 0);
480 if (irq_base < 0) {
481 dev_err(&pdev->dev, "Failed to alloc irq_descs\n");
482 return irq_base;
483 }
484
485 irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
486 &irq_domain_simple_ops, NULL);
487
488 ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
489 if (ret < 0)
490 return ret;
491
492 priv->irq_base = irq_base;
493
494no_irqs:
495 priv->gpio_chip = template_chip;
496 priv->gpio_chip.base = -1;
497 priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;
498 priv->gpio_chip.dev = &pdev->dev;
499
500 mutex_init(&priv->mutex);
501
502 if (node)
503 pdata = of_gpio_twl4030(&pdev->dev);
504
505 if (pdata == NULL) {
506 dev_err(&pdev->dev, "Platform data is missing\n");
507 return -ENXIO;
508 }
509
510
511
512
513
514
515
516 ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
517 if (ret)
518 dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
519 pdata->pullups, pdata->pulldowns, ret);
520
521 ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
522 if (ret)
523 dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
524 pdata->debounce, pdata->mmc_cd, ret);
525
526
527
528
529
530 if (pdata->use_leds)
531 priv->gpio_chip.ngpio += 2;
532
533 ret = gpiochip_add(&priv->gpio_chip);
534 if (ret < 0) {
535 dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
536 priv->gpio_chip.ngpio = 0;
537 gpio_twl4030_remove(pdev);
538 goto out;
539 }
540
541 platform_set_drvdata(pdev, priv);
542
543 if (pdata && pdata->setup) {
544 int status;
545
546 status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
547 TWL4030_GPIO_MAX);
548 if (status)
549 dev_dbg(&pdev->dev, "setup --> %d\n", status);
550 }
551
552out:
553 return ret;
554}
555
556
557static int gpio_twl4030_remove(struct platform_device *pdev)
558{
559 struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
560 struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev);
561 int status;
562
563 if (pdata && pdata->teardown) {
564 status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,
565 TWL4030_GPIO_MAX);
566 if (status) {
567 dev_dbg(&pdev->dev, "teardown --> %d\n", status);
568 return status;
569 }
570 }
571
572 status = gpiochip_remove(&priv->gpio_chip);
573 if (status < 0)
574 return status;
575
576 if (is_module())
577 return 0;
578
579
580 WARN_ON(1);
581 return -EIO;
582}
583
584static const struct of_device_id twl_gpio_match[] = {
585 { .compatible = "ti,twl4030-gpio", },
586 { },
587};
588MODULE_DEVICE_TABLE(of, twl_gpio_match);
589
590
591MODULE_ALIAS("platform:twl4030_gpio");
592
593static struct platform_driver gpio_twl4030_driver = {
594 .driver = {
595 .name = "twl4030_gpio",
596 .owner = THIS_MODULE,
597 .of_match_table = of_match_ptr(twl_gpio_match),
598 },
599 .probe = gpio_twl4030_probe,
600 .remove = gpio_twl4030_remove,
601};
602
603static int __init gpio_twl4030_init(void)
604{
605 return platform_driver_register(&gpio_twl4030_driver);
606}
607subsys_initcall(gpio_twl4030_init);
608
609static void __exit gpio_twl4030_exit(void)
610{
611 platform_driver_unregister(&gpio_twl4030_driver);
612}
613module_exit(gpio_twl4030_exit);
614
615MODULE_AUTHOR("Texas Instruments, Inc.");
616MODULE_DESCRIPTION("GPIO interface for TWL4030");
617MODULE_LICENSE("GPL");
618