Commit | Line | Data |
---|---|---|
e14fa824 RV |
1 | /* |
2 | * pca9532.c - 16-bit Led dimmer | |
3 | * | |
3dbf622c | 4 | * Copyright (C) 2011 Jan Weitzel |
b26e0ed4 | 5 | * Copyright (C) 2008 Riku Voipio |
e14fa824 RV |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
3dbf622c | 11 | * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf |
e14fa824 RV |
12 | * |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/i2c.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
e14fa824 RV |
18 | #include <linux/leds.h> |
19 | #include <linux/input.h> | |
20 | #include <linux/mutex.h> | |
934cd3f9 | 21 | #include <linux/workqueue.h> |
e14fa824 | 22 | #include <linux/leds-pca9532.h> |
3c1ab50d | 23 | #include <linux/gpio.h> |
e14fa824 | 24 | |
3dbf622c JW |
25 | /* m = num_leds*/ |
26 | #define PCA9532_REG_INPUT(i) ((i) >> 3) | |
27 | #define PCA9532_REG_OFFSET(m) ((m) >> 4) | |
28 | #define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2) | |
29 | #define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2) | |
30 | #define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2)) | |
31 | #define LED_NUM(led) (led & 0x3) | |
e14fa824 RV |
32 | |
33 | #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) | |
34 | ||
3dbf622c JW |
35 | struct pca9532_chip_info { |
36 | u8 num_leds; | |
37 | }; | |
38 | ||
e14fa824 RV |
39 | struct pca9532_data { |
40 | struct i2c_client *client; | |
41 | struct pca9532_led leds[16]; | |
42 | struct mutex update_lock; | |
85c5204a | 43 | struct input_dev *idev; |
07172d2b | 44 | struct work_struct work; |
3c1ab50d JE |
45 | #ifdef CONFIG_LEDS_PCA9532_GPIO |
46 | struct gpio_chip gpio; | |
47 | #endif | |
3dbf622c | 48 | const struct pca9532_chip_info *chip_info; |
e14fa824 RV |
49 | u8 pwm[2]; |
50 | u8 psc[2]; | |
51 | }; | |
52 | ||
53 | static int pca9532_probe(struct i2c_client *client, | |
54 | const struct i2c_device_id *id); | |
55 | static int pca9532_remove(struct i2c_client *client); | |
56 | ||
3dbf622c JW |
57 | enum { |
58 | pca9530, | |
59 | pca9531, | |
60 | pca9532, | |
61 | pca9533, | |
62 | }; | |
63 | ||
e14fa824 | 64 | static const struct i2c_device_id pca9532_id[] = { |
3dbf622c JW |
65 | { "pca9530", pca9530 }, |
66 | { "pca9531", pca9531 }, | |
67 | { "pca9532", pca9532 }, | |
68 | { "pca9533", pca9533 }, | |
e14fa824 RV |
69 | { } |
70 | }; | |
71 | ||
72 | MODULE_DEVICE_TABLE(i2c, pca9532_id); | |
73 | ||
3dbf622c JW |
74 | static const struct pca9532_chip_info pca9532_chip_info_tbl[] = { |
75 | [pca9530] = { | |
76 | .num_leds = 2, | |
77 | }, | |
78 | [pca9531] = { | |
79 | .num_leds = 8, | |
80 | }, | |
81 | [pca9532] = { | |
82 | .num_leds = 16, | |
83 | }, | |
84 | [pca9533] = { | |
85 | .num_leds = 4, | |
86 | }, | |
87 | }; | |
88 | ||
e14fa824 RV |
89 | static struct i2c_driver pca9532_driver = { |
90 | .driver = { | |
30cb35be | 91 | .name = "leds-pca953x", |
e14fa824 | 92 | }, |
85c5204a | 93 | .probe = pca9532_probe, |
e14fa824 RV |
94 | .remove = pca9532_remove, |
95 | .id_table = pca9532_id, | |
96 | }; | |
97 | ||
25985edc | 98 | /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally, |
e14fa824 RV |
99 | * the clever Thecus people are using one pwm to drive the beeper. So, |
100 | * as a compromise we average one pwm to the values requested by all | |
101 | * leds that are not ON/OFF. | |
102 | * */ | |
934cd3f9 | 103 | static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, |
e14fa824 RV |
104 | enum led_brightness value) |
105 | { | |
106 | int a = 0, b = 0, i = 0; | |
107 | struct pca9532_data *data = i2c_get_clientdata(client); | |
3dbf622c | 108 | for (i = 0; i < data->chip_info->num_leds; i++) { |
e14fa824 RV |
109 | if (data->leds[i].type == PCA9532_TYPE_LED && |
110 | data->leds[i].state == PCA9532_PWM0+pwm) { | |
111 | a++; | |
112 | b += data->leds[i].ldev.brightness; | |
113 | } | |
114 | } | |
115 | if (a == 0) { | |
116 | dev_err(&client->dev, | |
117 | "fear of division by zero %d/%d, wanted %d\n", | |
118 | b, a, value); | |
119 | return -EINVAL; | |
120 | } | |
121 | b = b/a; | |
122 | if (b > 0xFF) | |
123 | return -EINVAL; | |
e14fa824 | 124 | data->pwm[pwm] = b; |
07172d2b AO |
125 | data->psc[pwm] = blink; |
126 | return 0; | |
934cd3f9 RV |
127 | } |
128 | ||
129 | static int pca9532_setpwm(struct i2c_client *client, int pwm) | |
130 | { | |
07172d2b | 131 | struct pca9532_data *data = i2c_get_clientdata(client); |
3dbf622c JW |
132 | u8 maxleds = data->chip_info->num_leds; |
133 | ||
07172d2b | 134 | mutex_lock(&data->update_lock); |
3dbf622c | 135 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm), |
e14fa824 | 136 | data->pwm[pwm]); |
3dbf622c | 137 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm), |
e14fa824 RV |
138 | data->psc[pwm]); |
139 | mutex_unlock(&data->update_lock); | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* Set LED routing */ | |
144 | static void pca9532_setled(struct pca9532_led *led) | |
145 | { | |
146 | struct i2c_client *client = led->client; | |
147 | struct pca9532_data *data = i2c_get_clientdata(client); | |
3dbf622c | 148 | u8 maxleds = data->chip_info->num_leds; |
e14fa824 RV |
149 | char reg; |
150 | ||
151 | mutex_lock(&data->update_lock); | |
3dbf622c | 152 | reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); |
e14fa824 RV |
153 | /* zero led bits */ |
154 | reg = reg & ~(0x3<<LED_NUM(led->id)*2); | |
155 | /* set the new value */ | |
156 | reg = reg | (led->state << LED_NUM(led->id)*2); | |
3dbf622c | 157 | i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg); |
e14fa824 RV |
158 | mutex_unlock(&data->update_lock); |
159 | } | |
160 | ||
00a88a19 | 161 | static int pca9532_set_brightness(struct led_classdev *led_cdev, |
e14fa824 RV |
162 | enum led_brightness value) |
163 | { | |
164 | int err = 0; | |
165 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
166 | ||
167 | if (value == LED_OFF) | |
168 | led->state = PCA9532_OFF; | |
169 | else if (value == LED_FULL) | |
170 | led->state = PCA9532_ON; | |
171 | else { | |
172 | led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ | |
07172d2b | 173 | err = pca9532_calcpwm(led->client, 0, 0, value); |
e14fa824 | 174 | if (err) |
00a88a19 | 175 | return err; |
e14fa824 | 176 | } |
00a88a19 AL |
177 | if (led->state == PCA9532_PWM0) |
178 | pca9532_setpwm(led->client, 0); | |
179 | pca9532_setled(led); | |
180 | return err; | |
e14fa824 RV |
181 | } |
182 | ||
183 | static int pca9532_set_blink(struct led_classdev *led_cdev, | |
184 | unsigned long *delay_on, unsigned long *delay_off) | |
185 | { | |
186 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
187 | struct i2c_client *client = led->client; | |
188 | int psc; | |
07172d2b | 189 | int err = 0; |
e14fa824 RV |
190 | |
191 | if (*delay_on == 0 && *delay_off == 0) { | |
962363ce | 192 | /* led subsystem ask us for a blink rate */ |
85c5204a | 193 | *delay_on = 1000; |
e14fa824 RV |
194 | *delay_off = 1000; |
195 | } | |
196 | if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) | |
197 | return -EINVAL; | |
198 | ||
199 | /* Thecus specific: only use PSC/PWM 0 */ | |
200 | psc = (*delay_on * 152-1)/1000; | |
07172d2b AO |
201 | err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); |
202 | if (err) | |
203 | return err; | |
00a88a19 AL |
204 | if (led->state == PCA9532_PWM0) |
205 | pca9532_setpwm(led->client, 0); | |
206 | pca9532_setled(led); | |
207 | ||
07172d2b | 208 | return 0; |
e14fa824 RV |
209 | } |
210 | ||
0d733579 SW |
211 | static int pca9532_event(struct input_dev *dev, unsigned int type, |
212 | unsigned int code, int value) | |
e14fa824 RV |
213 | { |
214 | struct pca9532_data *data = input_get_drvdata(dev); | |
215 | ||
7fbc3a9b | 216 | if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) |
e14fa824 RV |
217 | return -1; |
218 | ||
219 | /* XXX: allow different kind of beeps with psc/pwm modifications */ | |
220 | if (value > 1 && value < 32767) | |
221 | data->pwm[1] = 127; | |
222 | else | |
223 | data->pwm[1] = 0; | |
224 | ||
07172d2b | 225 | schedule_work(&data->work); |
934cd3f9 | 226 | |
07172d2b | 227 | return 0; |
934cd3f9 RV |
228 | } |
229 | ||
230 | static void pca9532_input_work(struct work_struct *work) | |
231 | { | |
3dbf622c JW |
232 | struct pca9532_data *data = |
233 | container_of(work, struct pca9532_data, work); | |
234 | u8 maxleds = data->chip_info->num_leds; | |
235 | ||
e14fa824 | 236 | mutex_lock(&data->update_lock); |
3dbf622c | 237 | i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1), |
e14fa824 RV |
238 | data->pwm[1]); |
239 | mutex_unlock(&data->update_lock); | |
934cd3f9 | 240 | } |
e14fa824 | 241 | |
3c1ab50d JE |
242 | #ifdef CONFIG_LEDS_PCA9532_GPIO |
243 | static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) | |
244 | { | |
dced1467 | 245 | struct pca9532_data *data = gpiochip_get_data(gc); |
3c1ab50d JE |
246 | struct pca9532_led *led = &data->leds[offset]; |
247 | ||
248 | if (led->type == PCA9532_TYPE_GPIO) | |
249 | return 0; | |
250 | ||
251 | return -EBUSY; | |
252 | } | |
253 | ||
254 | static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) | |
255 | { | |
dced1467 | 256 | struct pca9532_data *data = gpiochip_get_data(gc); |
3c1ab50d JE |
257 | struct pca9532_led *led = &data->leds[offset]; |
258 | ||
259 | if (val) | |
260 | led->state = PCA9532_ON; | |
261 | else | |
262 | led->state = PCA9532_OFF; | |
263 | ||
264 | pca9532_setled(led); | |
265 | } | |
266 | ||
267 | static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) | |
268 | { | |
dced1467 | 269 | struct pca9532_data *data = gpiochip_get_data(gc); |
3c1ab50d JE |
270 | unsigned char reg; |
271 | ||
272 | reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); | |
273 | ||
274 | return !!(reg & (1 << (offset % 8))); | |
275 | } | |
276 | ||
277 | static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
278 | { | |
279 | /* To use as input ensure pin is not driven */ | |
280 | pca9532_gpio_set_value(gc, offset, 0); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) | |
286 | { | |
287 | pca9532_gpio_set_value(gc, offset, val); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | #endif /* CONFIG_LEDS_PCA9532_GPIO */ | |
292 | ||
293 | static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs) | |
125c7135 AL |
294 | { |
295 | int i = n_devs; | |
296 | ||
297 | if (!data) | |
3c1ab50d | 298 | return -EINVAL; |
125c7135 AL |
299 | |
300 | while (--i >= 0) { | |
301 | switch (data->leds[i].type) { | |
302 | case PCA9532_TYPE_NONE: | |
3c1ab50d | 303 | case PCA9532_TYPE_GPIO: |
125c7135 AL |
304 | break; |
305 | case PCA9532_TYPE_LED: | |
306 | led_classdev_unregister(&data->leds[i].ldev); | |
125c7135 AL |
307 | break; |
308 | case PCA9532_TYPE_N2100_BEEP: | |
309 | if (data->idev != NULL) { | |
125c7135 AL |
310 | cancel_work_sync(&data->work); |
311 | data->idev = NULL; | |
312 | } | |
313 | break; | |
314 | } | |
315 | } | |
3c1ab50d JE |
316 | |
317 | #ifdef CONFIG_LEDS_PCA9532_GPIO | |
58383c78 | 318 | if (data->gpio.parent) |
88d5e520 | 319 | gpiochip_remove(&data->gpio); |
3c1ab50d JE |
320 | #endif |
321 | ||
322 | return 0; | |
125c7135 AL |
323 | } |
324 | ||
e14fa824 RV |
325 | static int pca9532_configure(struct i2c_client *client, |
326 | struct pca9532_data *data, struct pca9532_platform_data *pdata) | |
327 | { | |
328 | int i, err = 0; | |
3c1ab50d | 329 | int gpios = 0; |
3dbf622c | 330 | u8 maxleds = data->chip_info->num_leds; |
e14fa824 RV |
331 | |
332 | for (i = 0; i < 2; i++) { | |
333 | data->pwm[i] = pdata->pwm[i]; | |
334 | data->psc[i] = pdata->psc[i]; | |
3dbf622c | 335 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), |
e14fa824 | 336 | data->pwm[i]); |
3dbf622c | 337 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), |
e14fa824 RV |
338 | data->psc[i]); |
339 | } | |
340 | ||
3dbf622c | 341 | for (i = 0; i < data->chip_info->num_leds; i++) { |
e14fa824 RV |
342 | struct pca9532_led *led = &data->leds[i]; |
343 | struct pca9532_led *pled = &pdata->leds[i]; | |
344 | led->client = client; | |
345 | led->id = i; | |
346 | led->type = pled->type; | |
347 | switch (led->type) { | |
348 | case PCA9532_TYPE_NONE: | |
349 | break; | |
3c1ab50d JE |
350 | case PCA9532_TYPE_GPIO: |
351 | gpios++; | |
352 | break; | |
e14fa824 RV |
353 | case PCA9532_TYPE_LED: |
354 | led->state = pled->state; | |
85c5204a | 355 | led->name = pled->name; |
e14fa824 RV |
356 | led->ldev.name = led->name; |
357 | led->ldev.brightness = LED_OFF; | |
00a88a19 AL |
358 | led->ldev.brightness_set_blocking = |
359 | pca9532_set_brightness; | |
e14fa824 | 360 | led->ldev.blink_set = pca9532_set_blink; |
f785d022 SW |
361 | err = led_classdev_register(&client->dev, &led->ldev); |
362 | if (err < 0) { | |
e14fa824 RV |
363 | dev_err(&client->dev, |
364 | "couldn't register LED %s\n", | |
365 | led->name); | |
366 | goto exit; | |
367 | } | |
368 | pca9532_setled(led); | |
369 | break; | |
370 | case PCA9532_TYPE_N2100_BEEP: | |
371 | BUG_ON(data->idev); | |
372 | led->state = PCA9532_PWM1; | |
373 | pca9532_setled(led); | |
8614fb46 | 374 | data->idev = devm_input_allocate_device(&client->dev); |
e14fa824 RV |
375 | if (data->idev == NULL) { |
376 | err = -ENOMEM; | |
377 | goto exit; | |
378 | } | |
379 | data->idev->name = pled->name; | |
380 | data->idev->phys = "i2c/pca9532"; | |
381 | data->idev->id.bustype = BUS_HOST; | |
85c5204a | 382 | data->idev->id.vendor = 0x001f; |
e14fa824 RV |
383 | data->idev->id.product = 0x0001; |
384 | data->idev->id.version = 0x0100; | |
385 | data->idev->evbit[0] = BIT_MASK(EV_SND); | |
386 | data->idev->sndbit[0] = BIT_MASK(SND_BELL) | | |
387 | BIT_MASK(SND_TONE); | |
388 | data->idev->event = pca9532_event; | |
389 | input_set_drvdata(data->idev, data); | |
07172d2b | 390 | INIT_WORK(&data->work, pca9532_input_work); |
e14fa824 RV |
391 | err = input_register_device(data->idev); |
392 | if (err) { | |
07172d2b | 393 | cancel_work_sync(&data->work); |
e14fa824 RV |
394 | data->idev = NULL; |
395 | goto exit; | |
396 | } | |
397 | break; | |
398 | } | |
399 | } | |
3c1ab50d JE |
400 | |
401 | #ifdef CONFIG_LEDS_PCA9532_GPIO | |
402 | if (gpios) { | |
403 | data->gpio.label = "gpio-pca9532"; | |
404 | data->gpio.direction_input = pca9532_gpio_direction_input; | |
405 | data->gpio.direction_output = pca9532_gpio_direction_output; | |
406 | data->gpio.set = pca9532_gpio_set_value; | |
407 | data->gpio.get = pca9532_gpio_get_value; | |
408 | data->gpio.request = pca9532_gpio_request_pin; | |
409 | data->gpio.can_sleep = 1; | |
410 | data->gpio.base = pdata->gpio_base; | |
3dbf622c | 411 | data->gpio.ngpio = data->chip_info->num_leds; |
58383c78 | 412 | data->gpio.parent = &client->dev; |
3c1ab50d JE |
413 | data->gpio.owner = THIS_MODULE; |
414 | ||
dced1467 | 415 | err = gpiochip_add_data(&data->gpio, data); |
3c1ab50d JE |
416 | if (err) { |
417 | /* Use data->gpio.dev as a flag for freeing gpiochip */ | |
58383c78 | 418 | data->gpio.parent = NULL; |
3c1ab50d JE |
419 | dev_warn(&client->dev, "could not add gpiochip\n"); |
420 | } else { | |
421 | dev_info(&client->dev, "gpios %i...%i\n", | |
422 | data->gpio.base, data->gpio.base + | |
423 | data->gpio.ngpio - 1); | |
424 | } | |
425 | } | |
426 | #endif | |
427 | ||
e14fa824 RV |
428 | return 0; |
429 | ||
430 | exit: | |
125c7135 | 431 | pca9532_destroy_devices(data, i); |
e14fa824 | 432 | return err; |
e14fa824 RV |
433 | } |
434 | ||
435 | static int pca9532_probe(struct i2c_client *client, | |
436 | const struct i2c_device_id *id) | |
437 | { | |
438 | struct pca9532_data *data = i2c_get_clientdata(client); | |
87aae1ea JH |
439 | struct pca9532_platform_data *pca9532_pdata = |
440 | dev_get_platdata(&client->dev); | |
f785d022 SW |
441 | |
442 | if (!pca9532_pdata) | |
443 | return -EIO; | |
e14fa824 RV |
444 | |
445 | if (!i2c_check_functionality(client->adapter, | |
446 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
447 | return -EIO; | |
448 | ||
0f4630c9 | 449 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
e14fa824 RV |
450 | if (!data) |
451 | return -ENOMEM; | |
452 | ||
3dbf622c JW |
453 | data->chip_info = &pca9532_chip_info_tbl[id->driver_data]; |
454 | ||
e14fa824 RV |
455 | dev_info(&client->dev, "setting platform data\n"); |
456 | i2c_set_clientdata(client, data); | |
457 | data->client = client; | |
458 | mutex_init(&data->update_lock); | |
459 | ||
0f4630c9 | 460 | return pca9532_configure(client, data, pca9532_pdata); |
e14fa824 RV |
461 | } |
462 | ||
463 | static int pca9532_remove(struct i2c_client *client) | |
464 | { | |
465 | struct pca9532_data *data = i2c_get_clientdata(client); | |
3c1ab50d JE |
466 | int err; |
467 | ||
3dbf622c | 468 | err = pca9532_destroy_devices(data, data->chip_info->num_leds); |
3c1ab50d JE |
469 | if (err) |
470 | return err; | |
471 | ||
e14fa824 RV |
472 | return 0; |
473 | } | |
474 | ||
09a0d183 | 475 | module_i2c_driver(pca9532_driver); |
e14fa824 | 476 | |
b26e0ed4 | 477 | MODULE_AUTHOR("Riku Voipio"); |
e14fa824 RV |
478 | MODULE_LICENSE("GPL"); |
479 | MODULE_DESCRIPTION("PCA 9532 LED dimmer"); |