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11#include <linux/module.h>
12#include <linux/i2c.h>
13#include <linux/slab.h>
14#include <linux/leds.h>
15#include <linux/input.h>
16#include <linux/mutex.h>
17#include <linux/workqueue.h>
18#include <linux/leds-pca9532.h>
19#include <linux/gpio.h>
20#include <linux/of.h>
21#include <linux/of_device.h>
22
23
24#define PCA9532_REG_INPUT(i) ((i) >> 3)
25#define PCA9532_REG_OFFSET(m) ((m) >> 4)
26#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
27#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
28#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
29#define LED_NUM(led) (led & 0x3)
30
31#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
32
33struct pca9532_chip_info {
34 u8 num_leds;
35};
36
37struct pca9532_data {
38 struct i2c_client *client;
39 struct pca9532_led leds[16];
40 struct mutex update_lock;
41 struct input_dev *idev;
42 struct work_struct work;
43#ifdef CONFIG_LEDS_PCA9532_GPIO
44 struct gpio_chip gpio;
45#endif
46 const struct pca9532_chip_info *chip_info;
47 u8 pwm[2];
48 u8 psc[2];
49};
50
51static int pca9532_probe(struct i2c_client *client,
52 const struct i2c_device_id *id);
53static int pca9532_remove(struct i2c_client *client);
54
55enum {
56 pca9530,
57 pca9531,
58 pca9532,
59 pca9533,
60};
61
62static const struct i2c_device_id pca9532_id[] = {
63 { "pca9530", pca9530 },
64 { "pca9531", pca9531 },
65 { "pca9532", pca9532 },
66 { "pca9533", pca9533 },
67 { }
68};
69
70MODULE_DEVICE_TABLE(i2c, pca9532_id);
71
72static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
73 [pca9530] = {
74 .num_leds = 2,
75 },
76 [pca9531] = {
77 .num_leds = 8,
78 },
79 [pca9532] = {
80 .num_leds = 16,
81 },
82 [pca9533] = {
83 .num_leds = 4,
84 },
85};
86
87#ifdef CONFIG_OF
88static const struct of_device_id of_pca9532_leds_match[] = {
89 { .compatible = "nxp,pca9530", .data = (void *)pca9530 },
90 { .compatible = "nxp,pca9531", .data = (void *)pca9531 },
91 { .compatible = "nxp,pca9532", .data = (void *)pca9532 },
92 { .compatible = "nxp,pca9533", .data = (void *)pca9533 },
93 {},
94};
95
96MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
97#endif
98
99static struct i2c_driver pca9532_driver = {
100 .driver = {
101 .name = "leds-pca953x",
102 .of_match_table = of_match_ptr(of_pca9532_leds_match),
103 },
104 .probe = pca9532_probe,
105 .remove = pca9532_remove,
106 .id_table = pca9532_id,
107};
108
109
110
111
112
113
114static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
115 enum led_brightness value)
116{
117 int a = 0, b = 0, i = 0;
118 struct pca9532_data *data = i2c_get_clientdata(client);
119 for (i = 0; i < data->chip_info->num_leds; i++) {
120 if (data->leds[i].type == PCA9532_TYPE_LED &&
121 data->leds[i].state == PCA9532_PWM0+pwm) {
122 a++;
123 b += data->leds[i].ldev.brightness;
124 }
125 }
126 if (a == 0) {
127 dev_err(&client->dev,
128 "fear of division by zero %d/%d, wanted %d\n",
129 b, a, value);
130 return -EINVAL;
131 }
132 b = b/a;
133 if (b > 0xFF)
134 return -EINVAL;
135 data->pwm[pwm] = b;
136 data->psc[pwm] = blink;
137 return 0;
138}
139
140static int pca9532_setpwm(struct i2c_client *client, int pwm)
141{
142 struct pca9532_data *data = i2c_get_clientdata(client);
143 u8 maxleds = data->chip_info->num_leds;
144
145 mutex_lock(&data->update_lock);
146 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
147 data->pwm[pwm]);
148 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
149 data->psc[pwm]);
150 mutex_unlock(&data->update_lock);
151 return 0;
152}
153
154
155static void pca9532_setled(struct pca9532_led *led)
156{
157 struct i2c_client *client = led->client;
158 struct pca9532_data *data = i2c_get_clientdata(client);
159 u8 maxleds = data->chip_info->num_leds;
160 char reg;
161
162 mutex_lock(&data->update_lock);
163 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
164
165 reg = reg & ~(0x3<<LED_NUM(led->id)*2);
166
167 reg = reg | (led->state << LED_NUM(led->id)*2);
168 i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
169 mutex_unlock(&data->update_lock);
170}
171
172static int pca9532_set_brightness(struct led_classdev *led_cdev,
173 enum led_brightness value)
174{
175 int err = 0;
176 struct pca9532_led *led = ldev_to_led(led_cdev);
177
178 if (value == LED_OFF)
179 led->state = PCA9532_OFF;
180 else if (value == LED_FULL)
181 led->state = PCA9532_ON;
182 else {
183 led->state = PCA9532_PWM0;
184 err = pca9532_calcpwm(led->client, 0, 0, value);
185 if (err)
186 return err;
187 }
188 if (led->state == PCA9532_PWM0)
189 pca9532_setpwm(led->client, 0);
190 pca9532_setled(led);
191 return err;
192}
193
194static int pca9532_set_blink(struct led_classdev *led_cdev,
195 unsigned long *delay_on, unsigned long *delay_off)
196{
197 struct pca9532_led *led = ldev_to_led(led_cdev);
198 struct i2c_client *client = led->client;
199 int psc;
200 int err = 0;
201
202 if (*delay_on == 0 && *delay_off == 0) {
203
204 *delay_on = 1000;
205 *delay_off = 1000;
206 }
207 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
208 return -EINVAL;
209
210
211 psc = (*delay_on * 152-1)/1000;
212 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
213 if (err)
214 return err;
215 if (led->state == PCA9532_PWM0)
216 pca9532_setpwm(led->client, 0);
217 pca9532_setled(led);
218
219 return 0;
220}
221
222static int pca9532_event(struct input_dev *dev, unsigned int type,
223 unsigned int code, int value)
224{
225 struct pca9532_data *data = input_get_drvdata(dev);
226
227 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
228 return -1;
229
230
231 if (value > 1 && value < 32767)
232 data->pwm[1] = 127;
233 else
234 data->pwm[1] = 0;
235
236 schedule_work(&data->work);
237
238 return 0;
239}
240
241static void pca9532_input_work(struct work_struct *work)
242{
243 struct pca9532_data *data =
244 container_of(work, struct pca9532_data, work);
245 u8 maxleds = data->chip_info->num_leds;
246
247 mutex_lock(&data->update_lock);
248 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
249 data->pwm[1]);
250 mutex_unlock(&data->update_lock);
251}
252
253static enum pca9532_state pca9532_getled(struct pca9532_led *led)
254{
255 struct i2c_client *client = led->client;
256 struct pca9532_data *data = i2c_get_clientdata(client);
257 u8 maxleds = data->chip_info->num_leds;
258 char reg;
259 enum pca9532_state ret;
260
261 mutex_lock(&data->update_lock);
262 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
263 ret = reg >> LED_NUM(led->id)/2;
264 mutex_unlock(&data->update_lock);
265 return ret;
266}
267
268#ifdef CONFIG_LEDS_PCA9532_GPIO
269static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
270{
271 struct pca9532_data *data = gpiochip_get_data(gc);
272 struct pca9532_led *led = &data->leds[offset];
273
274 if (led->type == PCA9532_TYPE_GPIO)
275 return 0;
276
277 return -EBUSY;
278}
279
280static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
281{
282 struct pca9532_data *data = gpiochip_get_data(gc);
283 struct pca9532_led *led = &data->leds[offset];
284
285 if (val)
286 led->state = PCA9532_ON;
287 else
288 led->state = PCA9532_OFF;
289
290 pca9532_setled(led);
291}
292
293static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
294{
295 struct pca9532_data *data = gpiochip_get_data(gc);
296 unsigned char reg;
297
298 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
299
300 return !!(reg & (1 << (offset % 8)));
301}
302
303static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
304{
305
306 pca9532_gpio_set_value(gc, offset, 0);
307
308 return 0;
309}
310
311static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
312{
313 pca9532_gpio_set_value(gc, offset, val);
314
315 return 0;
316}
317#endif
318
319static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
320{
321 int i = n_devs;
322
323 if (!data)
324 return -EINVAL;
325
326 while (--i >= 0) {
327 switch (data->leds[i].type) {
328 case PCA9532_TYPE_NONE:
329 case PCA9532_TYPE_GPIO:
330 break;
331 case PCA9532_TYPE_LED:
332 led_classdev_unregister(&data->leds[i].ldev);
333 break;
334 case PCA9532_TYPE_N2100_BEEP:
335 if (data->idev != NULL) {
336 cancel_work_sync(&data->work);
337 data->idev = NULL;
338 }
339 break;
340 }
341 }
342
343#ifdef CONFIG_LEDS_PCA9532_GPIO
344 if (data->gpio.parent)
345 gpiochip_remove(&data->gpio);
346#endif
347
348 return 0;
349}
350
351static int pca9532_configure(struct i2c_client *client,
352 struct pca9532_data *data, struct pca9532_platform_data *pdata)
353{
354 int i, err = 0;
355 int gpios = 0;
356 u8 maxleds = data->chip_info->num_leds;
357
358 for (i = 0; i < 2; i++) {
359 data->pwm[i] = pdata->pwm[i];
360 data->psc[i] = pdata->psc[i];
361 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
362 data->pwm[i]);
363 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
364 data->psc[i]);
365 }
366
367 for (i = 0; i < data->chip_info->num_leds; i++) {
368 struct pca9532_led *led = &data->leds[i];
369 struct pca9532_led *pled = &pdata->leds[i];
370 led->client = client;
371 led->id = i;
372 led->type = pled->type;
373 switch (led->type) {
374 case PCA9532_TYPE_NONE:
375 break;
376 case PCA9532_TYPE_GPIO:
377 gpios++;
378 break;
379 case PCA9532_TYPE_LED:
380 if (pled->state == PCA9532_KEEP)
381 led->state = pca9532_getled(led);
382 else
383 led->state = pled->state;
384 led->name = pled->name;
385 led->ldev.name = led->name;
386 led->ldev.default_trigger = pled->default_trigger;
387 led->ldev.brightness = LED_OFF;
388 led->ldev.brightness_set_blocking =
389 pca9532_set_brightness;
390 led->ldev.blink_set = pca9532_set_blink;
391 err = led_classdev_register(&client->dev, &led->ldev);
392 if (err < 0) {
393 dev_err(&client->dev,
394 "couldn't register LED %s\n",
395 led->name);
396 goto exit;
397 }
398 pca9532_setled(led);
399 break;
400 case PCA9532_TYPE_N2100_BEEP:
401 BUG_ON(data->idev);
402 led->state = PCA9532_PWM1;
403 pca9532_setled(led);
404 data->idev = devm_input_allocate_device(&client->dev);
405 if (data->idev == NULL) {
406 err = -ENOMEM;
407 goto exit;
408 }
409 data->idev->name = pled->name;
410 data->idev->phys = "i2c/pca9532";
411 data->idev->id.bustype = BUS_HOST;
412 data->idev->id.vendor = 0x001f;
413 data->idev->id.product = 0x0001;
414 data->idev->id.version = 0x0100;
415 data->idev->evbit[0] = BIT_MASK(EV_SND);
416 data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
417 BIT_MASK(SND_TONE);
418 data->idev->event = pca9532_event;
419 input_set_drvdata(data->idev, data);
420 INIT_WORK(&data->work, pca9532_input_work);
421 err = input_register_device(data->idev);
422 if (err) {
423 cancel_work_sync(&data->work);
424 data->idev = NULL;
425 goto exit;
426 }
427 break;
428 }
429 }
430
431#ifdef CONFIG_LEDS_PCA9532_GPIO
432 if (gpios) {
433 data->gpio.label = "gpio-pca9532";
434 data->gpio.direction_input = pca9532_gpio_direction_input;
435 data->gpio.direction_output = pca9532_gpio_direction_output;
436 data->gpio.set = pca9532_gpio_set_value;
437 data->gpio.get = pca9532_gpio_get_value;
438 data->gpio.request = pca9532_gpio_request_pin;
439 data->gpio.can_sleep = 1;
440 data->gpio.base = pdata->gpio_base;
441 data->gpio.ngpio = data->chip_info->num_leds;
442 data->gpio.parent = &client->dev;
443 data->gpio.owner = THIS_MODULE;
444
445 err = gpiochip_add_data(&data->gpio, data);
446 if (err) {
447
448 data->gpio.parent = NULL;
449 dev_warn(&client->dev, "could not add gpiochip\n");
450 } else {
451 dev_info(&client->dev, "gpios %i...%i\n",
452 data->gpio.base, data->gpio.base +
453 data->gpio.ngpio - 1);
454 }
455 }
456#endif
457
458 return 0;
459
460exit:
461 pca9532_destroy_devices(data, i);
462 return err;
463}
464
465static struct pca9532_platform_data *
466pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
467{
468 struct pca9532_platform_data *pdata;
469 struct device_node *child;
470 const struct of_device_id *match;
471 int devid, maxleds;
472 int i = 0;
473 const char *state;
474
475 match = of_match_device(of_pca9532_leds_match, dev);
476 if (!match)
477 return ERR_PTR(-ENODEV);
478
479 devid = (int)(uintptr_t)match->data;
480 maxleds = pca9532_chip_info_tbl[devid].num_leds;
481
482 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
483 if (!pdata)
484 return ERR_PTR(-ENOMEM);
485
486 for_each_child_of_node(np, child) {
487 if (of_property_read_string(child, "label",
488 &pdata->leds[i].name))
489 pdata->leds[i].name = child->name;
490 of_property_read_u32(child, "type", &pdata->leds[i].type);
491 of_property_read_string(child, "linux,default-trigger",
492 &pdata->leds[i].default_trigger);
493 if (!of_property_read_string(child, "default-state", &state)) {
494 if (!strcmp(state, "on"))
495 pdata->leds[i].state = PCA9532_ON;
496 else if (!strcmp(state, "keep"))
497 pdata->leds[i].state = PCA9532_KEEP;
498 }
499 if (++i >= maxleds) {
500 of_node_put(child);
501 break;
502 }
503 }
504
505 return pdata;
506}
507
508static int pca9532_probe(struct i2c_client *client,
509 const struct i2c_device_id *id)
510{
511 int devid;
512 const struct of_device_id *of_id;
513 struct pca9532_data *data = i2c_get_clientdata(client);
514 struct pca9532_platform_data *pca9532_pdata =
515 dev_get_platdata(&client->dev);
516 struct device_node *np = client->dev.of_node;
517
518 if (!pca9532_pdata) {
519 if (np) {
520 pca9532_pdata =
521 pca9532_of_populate_pdata(&client->dev, np);
522 if (IS_ERR(pca9532_pdata))
523 return PTR_ERR(pca9532_pdata);
524 } else {
525 dev_err(&client->dev, "no platform data\n");
526 return -EINVAL;
527 }
528 of_id = of_match_device(of_pca9532_leds_match,
529 &client->dev);
530 if (unlikely(!of_id))
531 return -EINVAL;
532 devid = (int)(uintptr_t) of_id->data;
533 } else {
534 devid = id->driver_data;
535 }
536
537 if (!i2c_check_functionality(client->adapter,
538 I2C_FUNC_SMBUS_BYTE_DATA))
539 return -EIO;
540
541 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
542 if (!data)
543 return -ENOMEM;
544
545 data->chip_info = &pca9532_chip_info_tbl[devid];
546
547 dev_info(&client->dev, "setting platform data\n");
548 i2c_set_clientdata(client, data);
549 data->client = client;
550 mutex_init(&data->update_lock);
551
552 return pca9532_configure(client, data, pca9532_pdata);
553}
554
555static int pca9532_remove(struct i2c_client *client)
556{
557 struct pca9532_data *data = i2c_get_clientdata(client);
558 int err;
559
560 err = pca9532_destroy_devices(data, data->chip_info->num_leds);
561 if (err)
562 return err;
563
564 return 0;
565}
566
567module_i2c_driver(pca9532_driver);
568
569MODULE_AUTHOR("Riku Voipio");
570MODULE_LICENSE("GPL");
571MODULE_DESCRIPTION("PCA 9532 LED dimmer");
572
