diff options
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-lm3530.c | 73 |
1 files changed, 65 insertions, 8 deletions
diff --git a/drivers/leds/leds-lm3530.c b/drivers/leds/leds-lm3530.c index b37e6186d0fa..4d7ce7631acf 100644 --- a/drivers/leds/leds-lm3530.c +++ b/drivers/leds/leds-lm3530.c @@ -17,6 +17,7 @@ #include <linux/input.h> #include <linux/led-lm3530.h> #include <linux/types.h> +#include <linux/regulator/consumer.h> #define LM3530_LED_DEV "lcd-backlight" #define LM3530_NAME "lm3530-led" @@ -96,12 +97,18 @@ static struct lm3530_mode_map mode_map[] = { * @client: i2c client * @pdata: LM3530 platform data * @mode: mode of operation - manual, ALS, PWM + * @regulator: regulator + * @brighness: previous brightness value + * @enable: regulator is enabled */ struct lm3530_data { struct led_classdev led_dev; struct i2c_client *client; struct lm3530_platform_data *pdata; enum lm3530_mode mode; + struct regulator *regulator; + enum led_brightness brightness; + bool enable; }; static const u8 lm3530_reg[LM3530_REG_MAX] = { @@ -172,7 +179,10 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) | (pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT); - brightness = pltfm->brt_val; + if (drvdata->brightness) + brightness = drvdata->brightness; + else + brightness = drvdata->brightness = pltfm->brt_val; reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */ reg_val[1] = als_config; /* LM3530_ALS_CONFIG */ @@ -190,6 +200,16 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */ reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */ + if (!drvdata->enable) { + ret = regulator_enable(drvdata->regulator); + if (ret) { + dev_err(&drvdata->client->dev, + "Enable regulator failed\n"); + return ret; + } + drvdata->enable = true; + } + for (i = 0; i < LM3530_REG_MAX; i++) { ret = i2c_smbus_write_byte_data(client, lm3530_reg[i], reg_val[i]); @@ -210,12 +230,31 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev, switch (drvdata->mode) { case LM3530_BL_MODE_MANUAL: + if (!drvdata->enable) { + err = lm3530_init_registers(drvdata); + if (err) { + dev_err(&drvdata->client->dev, + "Register Init failed: %d\n", err); + break; + } + } + /* set the brightness in brightness control register*/ err = i2c_smbus_write_byte_data(drvdata->client, LM3530_BRT_CTRL_REG, brt_val / 2); if (err) dev_err(&drvdata->client->dev, "Unable to set brightness: %d\n", err); + else + drvdata->brightness = brt_val / 2; + + if (brt_val == 0) { + err = regulator_disable(drvdata->regulator); + if (err) + dev_err(&drvdata->client->dev, + "Disable regulator failed\n"); + drvdata->enable = false; + } break; case LM3530_BL_MODE_ALS: break; @@ -297,20 +336,31 @@ static int __devinit lm3530_probe(struct i2c_client *client, drvdata->mode = pdata->mode; drvdata->client = client; drvdata->pdata = pdata; + drvdata->brightness = LED_OFF; + drvdata->enable = false; drvdata->led_dev.name = LM3530_LED_DEV; drvdata->led_dev.brightness_set = lm3530_brightness_set; i2c_set_clientdata(client, drvdata); - err = lm3530_init_registers(drvdata); - if (err < 0) { - dev_err(&client->dev, "Register Init failed: %d\n", err); - err = -ENODEV; - goto err_reg_init; + drvdata->regulator = regulator_get(&client->dev, "vin"); + if (IS_ERR(drvdata->regulator)) { + dev_err(&client->dev, "regulator get failed\n"); + err = PTR_ERR(drvdata->regulator); + drvdata->regulator = NULL; + goto err_regulator_get; } - err = led_classdev_register((struct device *) - &client->dev, &drvdata->led_dev); + if (drvdata->pdata->brt_val) { + err = lm3530_init_registers(drvdata); + if (err < 0) { + dev_err(&client->dev, + "Register Init failed: %d\n", err); + err = -ENODEV; + goto err_reg_init; + } + } + err = led_classdev_register(&client->dev, &drvdata->led_dev); if (err < 0) { dev_err(&client->dev, "Register led class failed: %d\n", err); err = -ENODEV; @@ -330,6 +380,9 @@ err_create_file: led_classdev_unregister(&drvdata->led_dev); err_class_register: err_reg_init: + regulator_put(drvdata->regulator); +err_regulator_get: + i2c_set_clientdata(client, NULL); kfree(drvdata); err_out: return err; @@ -340,6 +393,10 @@ static int __devexit lm3530_remove(struct i2c_client *client) struct lm3530_data *drvdata = i2c_get_clientdata(client); device_remove_file(drvdata->led_dev.dev, &dev_attr_mode); + + if (drvdata->enable) + regulator_disable(drvdata->regulator); + regulator_put(drvdata->regulator); led_classdev_unregister(&drvdata->led_dev); kfree(drvdata); return 0; |