2 * LP5521/LP5523/LP55231 Common Driver
4 * Copyright 2012 Texas Instruments
6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * Derived from leds-lp5521.c, leds-lp5523.c
15 #include <linux/delay.h>
16 #include <linux/i2c.h>
17 #include <linux/leds.h>
18 #include <linux/module.h>
19 #include <linux/platform_data/leds-lp55xx.h>
21 #include "leds-lp55xx-common.h"
23 static void lp55xx_reset_device(struct lp55xx_chip *chip)
25 struct lp55xx_device_config *cfg = chip->cfg;
26 u8 addr = cfg->reset.addr;
27 u8 val = cfg->reset.val;
29 /* no error checking here because no ACK from the device after reset */
30 lp55xx_write(chip, addr, val);
33 static int lp55xx_detect_device(struct lp55xx_chip *chip)
35 struct lp55xx_device_config *cfg = chip->cfg;
36 u8 addr = cfg->enable.addr;
37 u8 val = cfg->enable.val;
40 ret = lp55xx_write(chip, addr, val);
44 usleep_range(1000, 2000);
46 ret = lp55xx_read(chip, addr, &val);
50 if (val != cfg->enable.val)
56 static int lp55xx_post_init_device(struct lp55xx_chip *chip)
58 struct lp55xx_device_config *cfg = chip->cfg;
60 if (!cfg->post_init_device)
63 return cfg->post_init_device(chip);
66 static int lp55xx_init_led(struct lp55xx_led *led,
67 struct lp55xx_chip *chip, int chan)
72 int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
74 return i2c_smbus_write_byte_data(chip->cl, reg, val);
76 EXPORT_SYMBOL_GPL(lp55xx_write);
78 int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
82 ret = i2c_smbus_read_byte_data(chip->cl, reg);
89 EXPORT_SYMBOL_GPL(lp55xx_read);
91 int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
96 ret = lp55xx_read(chip, reg, &tmp);
103 return lp55xx_write(chip, reg, tmp);
105 EXPORT_SYMBOL_GPL(lp55xx_update_bits);
107 int lp55xx_init_device(struct lp55xx_chip *chip)
109 struct lp55xx_platform_data *pdata;
110 struct lp55xx_device_config *cfg;
111 struct device *dev = &chip->cl->dev;
122 if (pdata->setup_resources) {
123 ret = pdata->setup_resources();
125 dev_err(dev, "setup resoure err: %d\n", ret);
132 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
134 usleep_range(1000, 2000); /* 500us abs min. */
137 lp55xx_reset_device(chip);
140 * Exact value is not available. 10 - 20ms
141 * appears to be enough for reset.
143 usleep_range(10000, 20000);
145 ret = lp55xx_detect_device(chip);
147 dev_err(dev, "device detection err: %d\n", ret);
151 /* chip specific initialization */
152 ret = lp55xx_post_init_device(chip);
154 dev_err(dev, "post init device err: %d\n", ret);
161 lp55xx_deinit_device(chip);
165 EXPORT_SYMBOL_GPL(lp55xx_init_device);
167 void lp55xx_deinit_device(struct lp55xx_chip *chip)
169 struct lp55xx_platform_data *pdata = chip->pdata;
174 if (pdata->release_resources)
175 pdata->release_resources();
177 EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
179 int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
181 struct lp55xx_platform_data *pdata = chip->pdata;
182 struct lp55xx_device_config *cfg = chip->cfg;
183 int num_channels = pdata->num_channels;
184 struct lp55xx_led *each;
189 if (!cfg->brightness_work_fn) {
190 dev_err(&chip->cl->dev, "empty brightness configuration\n");
194 for (i = 0; i < num_channels; i++) {
196 /* do not initialize channels that are not connected */
197 if (pdata->led_config[i].led_current == 0)
200 led_current = pdata->led_config[i].led_current;
202 ret = lp55xx_init_led(each, chip, i);
206 INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
211 /* setting led current at each channel */
212 if (cfg->set_led_current)
213 cfg->set_led_current(each, led_current);
219 for (i = 0; i < chip->num_leds; i++) {
221 led_classdev_unregister(&each->cdev);
222 flush_work(&each->brightness_work);
226 EXPORT_SYMBOL_GPL(lp55xx_register_leds);
228 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
229 MODULE_DESCRIPTION("LP55xx Common Driver");
230 MODULE_LICENSE("GPL");