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