2 * pca9532.c - 16-bit Led dimmer
4 * Copyright (C) 2011 Jan Weitzel
5 * Copyright (C) 2008 Riku Voipio
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.
11 * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
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>
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)
33 #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
35 struct pca9532_chip_info {
40 struct i2c_client *client;
41 struct pca9532_led leds[16];
42 struct mutex update_lock;
43 struct input_dev *idev;
44 struct work_struct work;
45 #ifdef CONFIG_LEDS_PCA9532_GPIO
46 struct gpio_chip gpio;
48 const struct pca9532_chip_info *chip_info;
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);
64 static const struct i2c_device_id pca9532_id[] = {
65 { "pca9530", pca9530 },
66 { "pca9531", pca9531 },
67 { "pca9532", pca9532 },
68 { "pca9533", pca9533 },
72 MODULE_DEVICE_TABLE(i2c, pca9532_id);
74 static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
89 static struct i2c_driver pca9532_driver = {
91 .name = "leds-pca953x",
93 .probe = pca9532_probe,
94 .remove = pca9532_remove,
95 .id_table = pca9532_id,
98 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
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.
103 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
104 enum led_brightness value)
106 int a = 0, b = 0, i = 0;
107 struct pca9532_data *data = i2c_get_clientdata(client);
108 for (i = 0; i < data->chip_info->num_leds; i++) {
109 if (data->leds[i].type == PCA9532_TYPE_LED &&
110 data->leds[i].state == PCA9532_PWM0+pwm) {
112 b += data->leds[i].ldev.brightness;
116 dev_err(&client->dev,
117 "fear of division by zero %d/%d, wanted %d\n",
125 data->psc[pwm] = blink;
129 static int pca9532_setpwm(struct i2c_client *client, int pwm)
131 struct pca9532_data *data = i2c_get_clientdata(client);
132 u8 maxleds = data->chip_info->num_leds;
134 mutex_lock(&data->update_lock);
135 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
137 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
139 mutex_unlock(&data->update_lock);
143 /* Set LED routing */
144 static void pca9532_setled(struct pca9532_led *led)
146 struct i2c_client *client = led->client;
147 struct pca9532_data *data = i2c_get_clientdata(client);
148 u8 maxleds = data->chip_info->num_leds;
151 mutex_lock(&data->update_lock);
152 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
154 reg = reg & ~(0x3<<LED_NUM(led->id)*2);
155 /* set the new value */
156 reg = reg | (led->state << LED_NUM(led->id)*2);
157 i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
158 mutex_unlock(&data->update_lock);
161 static void pca9532_set_brightness(struct led_classdev *led_cdev,
162 enum led_brightness value)
165 struct pca9532_led *led = ldev_to_led(led_cdev);
167 if (value == LED_OFF)
168 led->state = PCA9532_OFF;
169 else if (value == LED_FULL)
170 led->state = PCA9532_ON;
172 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
173 err = pca9532_calcpwm(led->client, 0, 0, value);
175 return; /* XXX: led api doesn't allow error code? */
177 schedule_work(&led->work);
180 static int pca9532_set_blink(struct led_classdev *led_cdev,
181 unsigned long *delay_on, unsigned long *delay_off)
183 struct pca9532_led *led = ldev_to_led(led_cdev);
184 struct i2c_client *client = led->client;
188 if (*delay_on == 0 && *delay_off == 0) {
189 /* led subsystem ask us for a blink rate */
193 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
196 /* Thecus specific: only use PSC/PWM 0 */
197 psc = (*delay_on * 152-1)/1000;
198 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
201 schedule_work(&led->work);
205 static int pca9532_event(struct input_dev *dev, unsigned int type,
206 unsigned int code, int value)
208 struct pca9532_data *data = input_get_drvdata(dev);
210 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
213 /* XXX: allow different kind of beeps with psc/pwm modifications */
214 if (value > 1 && value < 32767)
219 schedule_work(&data->work);
224 static void pca9532_input_work(struct work_struct *work)
226 struct pca9532_data *data =
227 container_of(work, struct pca9532_data, work);
228 u8 maxleds = data->chip_info->num_leds;
230 mutex_lock(&data->update_lock);
231 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
233 mutex_unlock(&data->update_lock);
236 static void pca9532_led_work(struct work_struct *work)
238 struct pca9532_led *led;
239 led = container_of(work, struct pca9532_led, work);
240 if (led->state == PCA9532_PWM0)
241 pca9532_setpwm(led->client, 0);
245 #ifdef CONFIG_LEDS_PCA9532_GPIO
246 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
248 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
249 struct pca9532_led *led = &data->leds[offset];
251 if (led->type == PCA9532_TYPE_GPIO)
257 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
259 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
260 struct pca9532_led *led = &data->leds[offset];
263 led->state = PCA9532_ON;
265 led->state = PCA9532_OFF;
270 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
272 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
275 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
277 return !!(reg & (1 << (offset % 8)));
280 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
282 /* To use as input ensure pin is not driven */
283 pca9532_gpio_set_value(gc, offset, 0);
288 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
290 pca9532_gpio_set_value(gc, offset, val);
294 #endif /* CONFIG_LEDS_PCA9532_GPIO */
296 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
304 switch (data->leds[i].type) {
305 case PCA9532_TYPE_NONE:
306 case PCA9532_TYPE_GPIO:
308 case PCA9532_TYPE_LED:
309 led_classdev_unregister(&data->leds[i].ldev);
310 cancel_work_sync(&data->leds[i].work);
312 case PCA9532_TYPE_N2100_BEEP:
313 if (data->idev != NULL) {
314 input_unregister_device(data->idev);
315 cancel_work_sync(&data->work);
322 #ifdef CONFIG_LEDS_PCA9532_GPIO
323 if (data->gpio.dev) {
324 int err = gpiochip_remove(&data->gpio);
326 dev_err(&data->client->dev, "%s failed, %d\n",
327 "gpiochip_remove()", err);
336 static int pca9532_configure(struct i2c_client *client,
337 struct pca9532_data *data, struct pca9532_platform_data *pdata)
341 u8 maxleds = data->chip_info->num_leds;
343 for (i = 0; i < 2; i++) {
344 data->pwm[i] = pdata->pwm[i];
345 data->psc[i] = pdata->psc[i];
346 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
348 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
352 for (i = 0; i < data->chip_info->num_leds; i++) {
353 struct pca9532_led *led = &data->leds[i];
354 struct pca9532_led *pled = &pdata->leds[i];
355 led->client = client;
357 led->type = pled->type;
359 case PCA9532_TYPE_NONE:
361 case PCA9532_TYPE_GPIO:
364 case PCA9532_TYPE_LED:
365 led->state = pled->state;
366 led->name = pled->name;
367 led->ldev.name = led->name;
368 led->ldev.brightness = LED_OFF;
369 led->ldev.brightness_set = pca9532_set_brightness;
370 led->ldev.blink_set = pca9532_set_blink;
371 INIT_WORK(&led->work, pca9532_led_work);
372 err = led_classdev_register(&client->dev, &led->ldev);
374 dev_err(&client->dev,
375 "couldn't register LED %s\n",
381 case PCA9532_TYPE_N2100_BEEP:
383 led->state = PCA9532_PWM1;
385 data->idev = input_allocate_device();
386 if (data->idev == NULL) {
390 data->idev->name = pled->name;
391 data->idev->phys = "i2c/pca9532";
392 data->idev->id.bustype = BUS_HOST;
393 data->idev->id.vendor = 0x001f;
394 data->idev->id.product = 0x0001;
395 data->idev->id.version = 0x0100;
396 data->idev->evbit[0] = BIT_MASK(EV_SND);
397 data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
399 data->idev->event = pca9532_event;
400 input_set_drvdata(data->idev, data);
401 INIT_WORK(&data->work, pca9532_input_work);
402 err = input_register_device(data->idev);
404 input_free_device(data->idev);
405 cancel_work_sync(&data->work);
413 #ifdef CONFIG_LEDS_PCA9532_GPIO
415 data->gpio.label = "gpio-pca9532";
416 data->gpio.direction_input = pca9532_gpio_direction_input;
417 data->gpio.direction_output = pca9532_gpio_direction_output;
418 data->gpio.set = pca9532_gpio_set_value;
419 data->gpio.get = pca9532_gpio_get_value;
420 data->gpio.request = pca9532_gpio_request_pin;
421 data->gpio.can_sleep = 1;
422 data->gpio.base = pdata->gpio_base;
423 data->gpio.ngpio = data->chip_info->num_leds;
424 data->gpio.dev = &client->dev;
425 data->gpio.owner = THIS_MODULE;
427 err = gpiochip_add(&data->gpio);
429 /* Use data->gpio.dev as a flag for freeing gpiochip */
430 data->gpio.dev = NULL;
431 dev_warn(&client->dev, "could not add gpiochip\n");
433 dev_info(&client->dev, "gpios %i...%i\n",
434 data->gpio.base, data->gpio.base +
435 data->gpio.ngpio - 1);
443 pca9532_destroy_devices(data, i);
447 static int pca9532_probe(struct i2c_client *client,
448 const struct i2c_device_id *id)
450 struct pca9532_data *data = i2c_get_clientdata(client);
451 struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
457 if (!i2c_check_functionality(client->adapter,
458 I2C_FUNC_SMBUS_BYTE_DATA))
461 data = kzalloc(sizeof(*data), GFP_KERNEL);
465 data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
467 dev_info(&client->dev, "setting platform data\n");
468 i2c_set_clientdata(client, data);
469 data->client = client;
470 mutex_init(&data->update_lock);
472 err = pca9532_configure(client, data, pca9532_pdata);
479 static int pca9532_remove(struct i2c_client *client)
481 struct pca9532_data *data = i2c_get_clientdata(client);
484 err = pca9532_destroy_devices(data, data->chip_info->num_leds);
492 static int __init pca9532_init(void)
494 return i2c_add_driver(&pca9532_driver);
497 static void __exit pca9532_exit(void)
499 i2c_del_driver(&pca9532_driver);
502 MODULE_AUTHOR("Riku Voipio");
503 MODULE_LICENSE("GPL");
504 MODULE_DESCRIPTION("PCA 9532 LED dimmer");
506 module_init(pca9532_init);
507 module_exit(pca9532_exit);