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>
This commit is contained in:
Dan Murphy
Jacek Anaszewski
parent
581e3ca38a
commit
07abd4325e
1 changed files with 122 additions and 40 deletions
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@ -15,6 +15,9 @@
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#include <linux/slab.h>
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#include <uapi/linux/uleds.h>
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#define LM36922_MODEL 0
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#define LM36923_MODEL 1
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#define LM3692X_REV 0x0
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#define LM3692X_RESET 0x1
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#define LM3692X_EN 0x10
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@ -33,6 +36,9 @@
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#define LM3692X_DEVICE_EN BIT(0)
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#define LM3692X_LED1_EN BIT(1)
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#define LM3692X_LED2_EN BIT(2)
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#define LM36923_LED3_EN BIT(3)
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#define LM3692X_ENABLE_MASK (LM3692X_DEVICE_EN | LM3692X_LED1_EN | \
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LM3692X_LED2_EN | LM36923_LED3_EN)
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/* Brightness Control Bits */
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#define LM3692X_BL_ADJ_POL BIT(0)
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@ -98,6 +104,8 @@
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* @enable_gpio - VDDIO/EN gpio to enable communication interface
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* @regulator - LED supply regulator pointer
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* @label - LED label
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* @led_enable - LED sync to be enabled
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* @model_id - Current device model ID enumerated
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*/
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struct lm3692x_led {
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struct mutex lock;
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@ -107,6 +115,8 @@ struct lm3692x_led {
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struct gpio_desc *enable_gpio;
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struct regulator *regulator;
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char label[LED_MAX_NAME_SIZE];
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int led_enable;
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int model_id;
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};
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static const struct reg_default lm3692x_reg_defs[] = {
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@ -189,6 +199,7 @@ static int lm3692x_brightness_set(struct led_classdev *led_cdev,
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static int lm3692x_init(struct lm3692x_led *led)
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{
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int enable_state;
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int ret;
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if (led->regulator) {
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@ -215,9 +226,25 @@ static int lm3692x_init(struct lm3692x_led *led)
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/*
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* For glitch free operation, the following data should
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* only be written while device enable bit is 0
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* only be written while LEDx enable bits are 0 and the device enable
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* bit is set to 1.
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* per Section 7.5.14 of the data sheet
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*/
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ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN);
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if (ret)
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goto out;
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/* Set the brightness to 0 so when enabled the LEDs do not come
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* on with full brightness.
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*/
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ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
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LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ);
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if (ret)
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@ -247,6 +274,38 @@ static int lm3692x_init(struct lm3692x_led *led)
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if (ret)
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goto out;
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switch (led->led_enable) {
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case 0:
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default:
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if (led->model_id == LM36923_MODEL)
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enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN |
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LM36923_LED3_EN;
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else
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enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN;
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break;
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case 1:
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enable_state = LM3692X_LED1_EN;
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break;
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case 2:
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enable_state = LM3692X_LED2_EN;
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break;
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case 3:
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if (led->model_id == LM36923_MODEL) {
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enable_state = LM36923_LED3_EN;
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break;
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}
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ret = -EINVAL;
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dev_err(&led->client->dev,
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"LED3 sync not available on this device\n");
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goto out;
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}
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ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,
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enable_state | LM3692X_DEVICE_EN);
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return ret;
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out:
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dev_err(&led->client->dev, "Fail writing initialization values\n");
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@ -263,55 +322,29 @@ static int lm3692x_init(struct lm3692x_led *led)
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return ret;
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}
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static int lm3692x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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static int lm3692x_probe_dt(struct lm3692x_led *led)
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{
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struct fwnode_handle *child = NULL;
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struct lm3692x_led *led;
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const char *name;
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int ret;
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led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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led->enable_gpio = devm_gpiod_get_optional(&client->dev,
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led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
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"enable", GPIOD_OUT_LOW);
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if (IS_ERR(led->enable_gpio)) {
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ret = PTR_ERR(led->enable_gpio);
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dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
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return ret;
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}
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led->regulator = devm_regulator_get(&client->dev, "vled");
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if (IS_ERR(led->regulator))
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led->regulator = NULL;
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led->client = client;
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led->led_dev.name = led->label;
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led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
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mutex_init(&led->lock);
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i2c_set_clientdata(client, led);
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led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
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if (IS_ERR(led->regmap)) {
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ret = PTR_ERR(led->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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dev_err(&led->client->dev, "Failed to get enable gpio: %d\n",
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ret);
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return ret;
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}
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ret = lm3692x_init(led);
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if (ret)
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return ret;
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led->regulator = devm_regulator_get(&led->client->dev, "vled");
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if (IS_ERR(led->regulator))
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led->regulator = NULL;
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child = device_get_next_child_node(&led->client->dev, child);
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if (!child) {
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dev_err(&led->client->dev, "No LED Child node\n");
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return ret;
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return -ENODEV;
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}
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fwnode_property_read_string(child, "linux,default-trigger",
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@ -325,14 +358,57 @@ static int lm3692x_probe(struct i2c_client *client,
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snprintf(led->label, sizeof(led->label),
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"%s:%s", led->client->name, name);
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led->led_dev.dev->of_node = to_of_node(child);
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ret = devm_led_classdev_register(&client->dev, &led->led_dev);
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ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
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if (ret) {
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dev_err(&client->dev, "led register err: %d\n", ret);
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dev_err(&led->client->dev, "reg DT property missing\n");
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return ret;
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}
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led->led_dev.name = led->label;
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ret = devm_led_classdev_register(&led->client->dev, &led->led_dev);
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if (ret) {
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dev_err(&led->client->dev, "led register err: %d\n", ret);
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return ret;
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}
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led->led_dev.dev->of_node = to_of_node(child);
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return 0;
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}
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static int lm3692x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3692x_led *led;
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int ret;
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led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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mutex_init(&led->lock);
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led->client = client;
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led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
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led->model_id = id->driver_data;
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i2c_set_clientdata(client, led);
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led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
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if (IS_ERR(led->regmap)) {
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ret = PTR_ERR(led->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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ret = lm3692x_probe_dt(led);
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if (ret)
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return ret;
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ret = lm3692x_init(led);
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if (ret)
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return ret;
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return 0;
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}
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@ -341,6 +417,12 @@ static int lm3692x_remove(struct i2c_client *client)
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struct lm3692x_led *led = i2c_get_clientdata(client);
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int ret;
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ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);
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if (ret) {
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dev_err(&led->client->dev, "Failed to disable regulator\n");
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return ret;
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}
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if (led->enable_gpio)
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gpiod_direction_output(led->enable_gpio, 0);
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@ -357,8 +439,8 @@ static int lm3692x_remove(struct i2c_client *client)
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}
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static const struct i2c_device_id lm3692x_id[] = {
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{ "lm36922", 0 },
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{ "lm36923", 1 },
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{ "lm36922", LM36922_MODEL },
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{ "lm36923", LM36923_MODEL },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm3692x_id);
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