diff options
author | Dan Murphy <dmurphy@ti.com> | 2018-07-02 13:12:16 -0500 |
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committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2018-07-03 22:27:12 +0200 |
commit | 07abd4325e7013c728bf9642fbb862aa9eb4a367 (patch) | |
tree | 935540b6c4c9882d58a450d4168eb5b6f80766c8 /drivers/leds | |
parent | 581e3ca38a1aa40b742baad39026f440445488d4 (diff) | |
download | linux-stable-07abd4325e7013c728bf9642fbb862aa9eb4a367.tar.gz linux-stable-07abd4325e7013c728bf9642fbb862aa9eb4a367.tar.bz2 linux-stable-07abd4325e7013c728bf9642fbb862aa9eb4a367.zip |
leds: lm3692x: Support LED sync configuration
The LM36922 has one output but can sync current to 2 LED
strings. The user may only use one sync so the other
syncs need to be disabled.
The LM36923 has 3 LED syncs.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r-- | drivers/leds/leds-lm3692x.c | 158 |
1 files changed, 120 insertions, 38 deletions
diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c index 9e6432b6a3b5..4f413a7c5f05 100644 --- a/drivers/leds/leds-lm3692x.c +++ b/drivers/leds/leds-lm3692x.c @@ -15,6 +15,9 @@ #include <linux/slab.h> #include <uapi/linux/uleds.h> +#define LM36922_MODEL 0 +#define LM36923_MODEL 1 + #define LM3692X_REV 0x0 #define LM3692X_RESET 0x1 #define LM3692X_EN 0x10 @@ -33,6 +36,9 @@ #define LM3692X_DEVICE_EN BIT(0) #define LM3692X_LED1_EN BIT(1) #define LM3692X_LED2_EN BIT(2) +#define LM36923_LED3_EN BIT(3) +#define LM3692X_ENABLE_MASK (LM3692X_DEVICE_EN | LM3692X_LED1_EN | \ + LM3692X_LED2_EN | LM36923_LED3_EN) /* Brightness Control Bits */ #define LM3692X_BL_ADJ_POL BIT(0) @@ -98,6 +104,8 @@ * @enable_gpio - VDDIO/EN gpio to enable communication interface * @regulator - LED supply regulator pointer * @label - LED label + * @led_enable - LED sync to be enabled + * @model_id - Current device model ID enumerated */ struct lm3692x_led { struct mutex lock; @@ -107,6 +115,8 @@ struct lm3692x_led { struct gpio_desc *enable_gpio; struct regulator *regulator; char label[LED_MAX_NAME_SIZE]; + int led_enable; + int model_id; }; static const struct reg_default lm3692x_reg_defs[] = { @@ -189,6 +199,7 @@ out: static int lm3692x_init(struct lm3692x_led *led) { + int enable_state; int ret; if (led->regulator) { @@ -215,9 +226,25 @@ static int lm3692x_init(struct lm3692x_led *led) /* * For glitch free operation, the following data should - * only be written while device enable bit is 0 + * only be written while LEDx enable bits are 0 and the device enable + * bit is set to 1. * per Section 7.5.14 of the data sheet */ + ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN); + if (ret) + goto out; + + /* Set the brightness to 0 so when enabled the LEDs do not come + * on with full brightness. + */ + ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0); + if (ret) + goto out; + ret = regmap_write(led->regmap, LM3692X_PWM_CTRL, LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ); if (ret) @@ -247,6 +274,38 @@ static int lm3692x_init(struct lm3692x_led *led) if (ret) goto out; + switch (led->led_enable) { + case 0: + default: + if (led->model_id == LM36923_MODEL) + enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN | + LM36923_LED3_EN; + else + enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN; + + break; + case 1: + enable_state = LM3692X_LED1_EN; + break; + case 2: + enable_state = LM3692X_LED2_EN; + break; + + case 3: + if (led->model_id == LM36923_MODEL) { + enable_state = LM36923_LED3_EN; + break; + } + + ret = -EINVAL; + dev_err(&led->client->dev, + "LED3 sync not available on this device\n"); + goto out; + } + + ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK, + enable_state | LM3692X_DEVICE_EN); + return ret; out: dev_err(&led->client->dev, "Fail writing initialization values\n"); @@ -263,55 +322,29 @@ out: return ret; } - -static int lm3692x_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int lm3692x_probe_dt(struct lm3692x_led *led) { struct fwnode_handle *child = NULL; - struct lm3692x_led *led; const char *name; int ret; - led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); - if (!led) - return -ENOMEM; - - led->enable_gpio = devm_gpiod_get_optional(&client->dev, + led->enable_gpio = devm_gpiod_get_optional(&led->client->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(led->enable_gpio)) { ret = PTR_ERR(led->enable_gpio); - dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); + dev_err(&led->client->dev, "Failed to get enable gpio: %d\n", + ret); return ret; } - led->regulator = devm_regulator_get(&client->dev, "vled"); + led->regulator = devm_regulator_get(&led->client->dev, "vled"); if (IS_ERR(led->regulator)) led->regulator = NULL; - led->client = client; - led->led_dev.name = led->label; - led->led_dev.brightness_set_blocking = lm3692x_brightness_set; - - mutex_init(&led->lock); - - i2c_set_clientdata(client, led); - - led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config); - if (IS_ERR(led->regmap)) { - ret = PTR_ERR(led->regmap); - dev_err(&client->dev, "Failed to allocate register map: %d\n", - ret); - return ret; - } - - ret = lm3692x_init(led); - if (ret) - return ret; - child = device_get_next_child_node(&led->client->dev, child); if (!child) { dev_err(&led->client->dev, "No LED Child node\n"); - return ret; + return -ENODEV; } fwnode_property_read_string(child, "linux,default-trigger", @@ -325,14 +358,57 @@ static int lm3692x_probe(struct i2c_client *client, snprintf(led->label, sizeof(led->label), "%s:%s", led->client->name, name); - led->led_dev.dev->of_node = to_of_node(child); + ret = fwnode_property_read_u32(child, "reg", &led->led_enable); + if (ret) { + dev_err(&led->client->dev, "reg DT property missing\n"); + return ret; + } + + led->led_dev.name = led->label; - ret = devm_led_classdev_register(&client->dev, &led->led_dev); + ret = devm_led_classdev_register(&led->client->dev, &led->led_dev); if (ret) { - dev_err(&client->dev, "led register err: %d\n", ret); + dev_err(&led->client->dev, "led register err: %d\n", ret); + return ret; + } + + led->led_dev.dev->of_node = to_of_node(child); + + return 0; +} + +static int lm3692x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lm3692x_led *led; + int ret; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + mutex_init(&led->lock); + led->client = client; + led->led_dev.brightness_set_blocking = lm3692x_brightness_set; + led->model_id = id->driver_data; + i2c_set_clientdata(client, led); + + led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config); + if (IS_ERR(led->regmap)) { + ret = PTR_ERR(led->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + ret); return ret; } + ret = lm3692x_probe_dt(led); + if (ret) + return ret; + + ret = lm3692x_init(led); + if (ret) + return ret; + return 0; } @@ -341,6 +417,12 @@ static int lm3692x_remove(struct i2c_client *client) struct lm3692x_led *led = i2c_get_clientdata(client); int ret; + ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0); + if (ret) { + dev_err(&led->client->dev, "Failed to disable regulator\n"); + return ret; + } + if (led->enable_gpio) gpiod_direction_output(led->enable_gpio, 0); @@ -357,8 +439,8 @@ static int lm3692x_remove(struct i2c_client *client) } static const struct i2c_device_id lm3692x_id[] = { - { "lm36922", 0 }, - { "lm36923", 1 }, + { "lm36922", LM36922_MODEL }, + { "lm36923", LM36923_MODEL }, { } }; MODULE_DEVICE_TABLE(i2c, lm3692x_id); |