// SPDX-License-Identifier: GPL-2.0 // TI LP50XX LED chip family driver // Copyright (C) 2018-20 Texas Instruments Incorporated - https://www.ti.com/ #include #include #include #include #include #include #include #include #include #include #include #include #define LP50XX_DEV_CFG0 0x00 #define LP50XX_DEV_CFG1 0x01 #define LP50XX_LED_CFG0 0x02 /* LP5009 and LP5012 registers */ #define LP5012_BNK_BRT 0x03 #define LP5012_BNKA_CLR 0x04 #define LP5012_BNKB_CLR 0x05 #define LP5012_BNKC_CLR 0x06 #define LP5012_LED0_BRT 0x07 #define LP5012_OUT0_CLR 0x0b #define LP5012_RESET 0x17 /* LP5018 and LP5024 registers */ #define LP5024_BNK_BRT 0x03 #define LP5024_BNKA_CLR 0x04 #define LP5024_BNKB_CLR 0x05 #define LP5024_BNKC_CLR 0x06 #define LP5024_LED0_BRT 0x07 #define LP5024_OUT0_CLR 0x0f #define LP5024_RESET 0x27 /* LP5030 and LP5036 registers */ #define LP5036_LED_CFG1 0x03 #define LP5036_BNK_BRT 0x04 #define LP5036_BNKA_CLR 0x05 #define LP5036_BNKB_CLR 0x06 #define LP5036_BNKC_CLR 0x07 #define LP5036_LED0_BRT 0x08 #define LP5036_OUT0_CLR 0x14 #define LP5036_RESET 0x38 #define LP50XX_SW_RESET 0xff #define LP50XX_CHIP_EN BIT(6) /* There are 3 LED outputs per bank */ #define LP50XX_LEDS_PER_MODULE 3 #define LP5009_MAX_LED_MODULES 2 #define LP5012_MAX_LED_MODULES 4 #define LP5018_MAX_LED_MODULES 6 #define LP5024_MAX_LED_MODULES 8 #define LP5030_MAX_LED_MODULES 10 #define LP5036_MAX_LED_MODULES 12 static const struct reg_default lp5012_reg_defs[] = { {LP50XX_DEV_CFG0, 0x0}, {LP50XX_DEV_CFG1, 0x3c}, {LP50XX_LED_CFG0, 0x0}, {LP5012_BNK_BRT, 0xff}, {LP5012_BNKA_CLR, 0x0f}, {LP5012_BNKB_CLR, 0x0f}, {LP5012_BNKC_CLR, 0x0f}, {LP5012_LED0_BRT, 0x0f}, /* LEDX_BRT registers are all 0xff for defaults */ {0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff}, {LP5012_OUT0_CLR, 0x0f}, /* OUTX_CLR registers are all 0x0 for defaults */ {0x0c, 0x00}, {0x0d, 0x00}, {0x0e, 0x00}, {0x0f, 0x00}, {0x10, 0x00}, {0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00}, {0x14, 0x00}, {0x15, 0x00}, {0x16, 0x00}, {LP5012_RESET, 0x00} }; static const struct reg_default lp5024_reg_defs[] = { {LP50XX_DEV_CFG0, 0x0}, {LP50XX_DEV_CFG1, 0x3c}, {LP50XX_LED_CFG0, 0x0}, {LP5024_BNK_BRT, 0xff}, {LP5024_BNKA_CLR, 0x0f}, {LP5024_BNKB_CLR, 0x0f}, {LP5024_BNKC_CLR, 0x0f}, {LP5024_LED0_BRT, 0x0f}, /* LEDX_BRT registers are all 0xff for defaults */ {0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff}, {0x0b, 0xff}, {0x0c, 0xff}, {0x0d, 0xff}, {0x0e, 0xff}, {LP5024_OUT0_CLR, 0x0f}, /* OUTX_CLR registers are all 0x0 for defaults */ {0x10, 0x00}, {0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00}, {0x14, 0x00}, {0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00}, {0x18, 0x00}, {0x19, 0x00}, {0x1a, 0x00}, {0x1b, 0x00}, {0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00}, {0x1f, 0x00}, {0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00}, {0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00}, {LP5024_RESET, 0x00} }; static const struct reg_default lp5036_reg_defs[] = { {LP50XX_DEV_CFG0, 0x0}, {LP50XX_DEV_CFG1, 0x3c}, {LP50XX_LED_CFG0, 0x0}, {LP5036_LED_CFG1, 0x0}, {LP5036_BNK_BRT, 0xff}, {LP5036_BNKA_CLR, 0x0f}, {LP5036_BNKB_CLR, 0x0f}, {LP5036_BNKC_CLR, 0x0f}, {LP5036_LED0_BRT, 0x0f}, /* LEDX_BRT registers are all 0xff for defaults */ {0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff}, {0x0b, 0xff}, {0x0c, 0xff}, {0x0d, 0xff}, {0x0e, 0xff}, {0x0f, 0xff}, {0x10, 0xff}, {0x11, 0xff}, {0x12, 0xff}, {0x13, 0xff}, {LP5036_OUT0_CLR, 0x0f}, /* OUTX_CLR registers are all 0x0 for defaults */ {0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00}, {0x18, 0x00}, {0x19, 0x00}, {0x1a, 0x00}, {0x1b, 0x00}, {0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00}, {0x1f, 0x00}, {0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00}, {0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00}, {0x29, 0x00}, {0x2a, 0x00}, {0x2b, 0x00}, {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x2f, 0x00}, {0x30, 0x00}, {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0x00}, {0x35, 0x00}, {0x36, 0x00}, {0x37, 0x00}, {LP5036_RESET, 0x00} }; static const struct regmap_config lp5012_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = LP5012_RESET, .reg_defaults = lp5012_reg_defs, .num_reg_defaults = ARRAY_SIZE(lp5012_reg_defs), .cache_type = REGCACHE_FLAT, }; static const struct regmap_config lp5024_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = LP5024_RESET, .reg_defaults = lp5024_reg_defs, .num_reg_defaults = ARRAY_SIZE(lp5024_reg_defs), .cache_type = REGCACHE_FLAT, }; static const struct regmap_config lp5036_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = LP5036_RESET, .reg_defaults = lp5036_reg_defs, .num_reg_defaults = ARRAY_SIZE(lp5036_reg_defs), .cache_type = REGCACHE_FLAT, }; enum lp50xx_model { LP5009, LP5012, LP5018, LP5024, LP5030, LP5036, }; /** * struct lp50xx_chip_info - * @lp50xx_regmap_config: regmap register configuration * @model_id: LED device model * @max_modules: total number of supported LED modules * @num_leds: number of LED outputs available on the device * @led_brightness0_reg: first brightness register of the device * @mix_out0_reg: first color mix register of the device * @bank_brt_reg: bank brightness register * @bank_mix_reg: color mix register * @reset_reg: device reset register */ struct lp50xx_chip_info { const struct regmap_config *lp50xx_regmap_config; int model_id; u8 max_modules; u8 num_leds; u8 led_brightness0_reg; u8 mix_out0_reg; u8 bank_brt_reg; u8 bank_mix_reg; u8 reset_reg; }; static const struct lp50xx_chip_info lp50xx_chip_info_tbl[] = { [LP5009] = { .model_id = LP5009, .max_modules = LP5009_MAX_LED_MODULES, .num_leds = LP5009_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5012_LED0_BRT, .mix_out0_reg = LP5012_OUT0_CLR, .bank_brt_reg = LP5012_BNK_BRT, .bank_mix_reg = LP5012_BNKA_CLR, .reset_reg = LP5012_RESET, .lp50xx_regmap_config = &lp5012_regmap_config, }, [LP5012] = { .model_id = LP5012, .max_modules = LP5012_MAX_LED_MODULES, .num_leds = LP5012_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5012_LED0_BRT, .mix_out0_reg = LP5012_OUT0_CLR, .bank_brt_reg = LP5012_BNK_BRT, .bank_mix_reg = LP5012_BNKA_CLR, .reset_reg = LP5012_RESET, .lp50xx_regmap_config = &lp5012_regmap_config, }, [LP5018] = { .model_id = LP5018, .max_modules = LP5018_MAX_LED_MODULES, .num_leds = LP5018_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5024_LED0_BRT, .mix_out0_reg = LP5024_OUT0_CLR, .bank_brt_reg = LP5024_BNK_BRT, .bank_mix_reg = LP5024_BNKA_CLR, .reset_reg = LP5024_RESET, .lp50xx_regmap_config = &lp5024_regmap_config, }, [LP5024] = { .model_id = LP5024, .max_modules = LP5024_MAX_LED_MODULES, .num_leds = LP5024_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5024_LED0_BRT, .mix_out0_reg = LP5024_OUT0_CLR, .bank_brt_reg = LP5024_BNK_BRT, .bank_mix_reg = LP5024_BNKA_CLR, .reset_reg = LP5024_RESET, .lp50xx_regmap_config = &lp5024_regmap_config, }, [LP5030] = { .model_id = LP5030, .max_modules = LP5030_MAX_LED_MODULES, .num_leds = LP5030_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5036_LED0_BRT, .mix_out0_reg = LP5036_OUT0_CLR, .bank_brt_reg = LP5036_BNK_BRT, .bank_mix_reg = LP5036_BNKA_CLR, .reset_reg = LP5036_RESET, .lp50xx_regmap_config = &lp5036_regmap_config, }, [LP5036] = { .model_id = LP5036, .max_modules = LP5036_MAX_LED_MODULES, .num_leds = LP5036_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE, .led_brightness0_reg = LP5036_LED0_BRT, .mix_out0_reg = LP5036_OUT0_CLR, .bank_brt_reg = LP5036_BNK_BRT, .bank_mix_reg = LP5036_BNKA_CLR, .reset_reg = LP5036_RESET, .lp50xx_regmap_config = &lp5036_regmap_config, }, }; struct lp50xx_led { struct led_classdev_mc mc_cdev; struct lp50xx *priv; u8 ctrl_bank_enabled; int led_number; }; /** * struct lp50xx - * @enable_gpio: hardware enable gpio * @regulator: LED supply regulator pointer * @client: pointer to the I2C client * @regmap: device register map * @dev: pointer to the devices device struct * @lock: lock for reading/writing the device * @chip_info: chip specific information (ie num_leds) * @leds: array of LED strings */ struct lp50xx { struct gpio_desc *enable_gpio; struct regulator *regulator; struct i2c_client *client; struct regmap *regmap; struct device *dev; struct mutex lock; const struct lp50xx_chip_info *chip_info; /* This needs to be at the end of the struct */ struct lp50xx_led leds[]; }; static struct lp50xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev) { return container_of(mc_cdev, struct lp50xx_led, mc_cdev); } static int lp50xx_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); struct lp50xx_led *led = mcled_cdev_to_led(mc_dev); const struct lp50xx_chip_info *led_chip = led->priv->chip_info; u8 led_offset, reg_val; int ret = 0; int i; mutex_lock(&led->priv->lock); if (led->ctrl_bank_enabled) reg_val = led_chip->bank_brt_reg; else reg_val = led_chip->led_brightness0_reg + led->led_number; ret = regmap_write(led->priv->regmap, reg_val, brightness); if (ret) { dev_err(led->priv->dev, "Cannot write brightness value %d\n", ret); goto out; } for (i = 0; i < led->mc_cdev.num_colors; i++) { if (led->ctrl_bank_enabled) { reg_val = led_chip->bank_mix_reg + i; } else { led_offset = (led->led_number * 3) + i; reg_val = led_chip->mix_out0_reg + led_offset; } ret = regmap_write(led->priv->regmap, reg_val, mc_dev->subled_info[i].intensity); if (ret) { dev_err(led->priv->dev, "Cannot write intensity value %d\n", ret); goto out; } } out: mutex_unlock(&led->priv->lock); return ret; } static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[]) { u8 led_config_lo, led_config_hi; u32 bank_enable_mask = 0; int ret; int i; for (i = 0; i < priv->chip_info->max_modules; i++) { if (led_banks[i]) bank_enable_mask |= (1 << led_banks[i]); } led_config_lo = bank_enable_mask; led_config_hi = bank_enable_mask >> 8; ret = regmap_write(priv->regmap, LP50XX_LED_CFG0, led_config_lo); if (ret) return ret; if (priv->chip_info->model_id >= LP5030) ret = regmap_write(priv->regmap, LP5036_LED_CFG1, led_config_hi); return ret; } static int lp50xx_reset(struct lp50xx *priv) { return regmap_write(priv->regmap, priv->chip_info->reset_reg, LP50XX_SW_RESET); } static int lp50xx_enable_disable(struct lp50xx *priv, int enable_disable) { int ret; ret = gpiod_direction_output(priv->enable_gpio, enable_disable); if (ret) return ret; if (enable_disable) return regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_EN); else return regmap_write(priv->regmap, LP50XX_DEV_CFG0, 0); } static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv, struct lp50xx_led *led, int num_leds) { u32 led_banks[LP5036_MAX_LED_MODULES] = {0}; int led_number; int ret; if (num_leds > 1) { if (num_leds > priv->chip_info->max_modules) { dev_err(priv->dev, "reg property is invalid\n"); return -EINVAL; } ret = fwnode_property_read_u32_array(child, "reg", led_banks, num_leds); if (ret) { dev_err(priv->dev, "reg property is missing\n"); return ret; } ret = lp50xx_set_banks(priv, led_banks); if (ret) { dev_err(priv->dev, "Cannot setup banked LEDs\n"); return ret; } led->ctrl_bank_enabled = 1; } else { ret = fwnode_property_read_u32(child, "reg", &led_number); if (ret) { dev_err(priv->dev, "led reg property missing\n"); return ret; } if (led_number > priv->chip_info->num_leds) { dev_err(priv->dev, "led-sources property is invalid\n"); return -EINVAL; } led->led_number = led_number; } return 0; } static int lp50xx_probe_dt(struct lp50xx *priv) { struct fwnode_handle *led_node = NULL; struct led_init_data init_data = {}; struct led_classdev *led_cdev; struct mc_subled *mc_led_info; struct lp50xx_led *led; int ret = -EINVAL; int num_colors; u32 color_id; int i = 0; priv->enable_gpio = devm_gpiod_get_optional(priv->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(priv->enable_gpio)) return dev_err_probe(priv->dev, PTR_ERR(priv->enable_gpio), "Failed to get enable GPIO\n"); priv->regulator = devm_regulator_get(priv->dev, "vled"); if (IS_ERR(priv->regulator)) priv->regulator = NULL; device_for_each_child_node_scoped(priv->dev, child) { led = &priv->leds[i]; ret = fwnode_property_count_u32(child, "reg"); if (ret < 0) { dev_err(priv->dev, "reg property is invalid\n"); return ret; } ret = lp50xx_probe_leds(child, priv, led, ret); if (ret) return ret; init_data.fwnode = child; num_colors = 0; /* * There are only 3 LEDs per module otherwise they should be * banked which also is presented as 3 LEDs. */ mc_led_info = devm_kcalloc(priv->dev, LP50XX_LEDS_PER_MODULE, sizeof(*mc_led_info), GFP_KERNEL); if (!mc_led_info) return -ENOMEM; fwnode_for_each_child_node(child, led_node) { ret = fwnode_property_read_u32(led_node, "color", &color_id); if (ret) { fwnode_handle_put(led_node); dev_err(priv->dev, "Cannot read color\n"); return ret; } mc_led_info[num_colors].color_index = color_id; num_colors++; } led->priv = priv; led->mc_cdev.num_colors = num_colors; led->mc_cdev.subled_info = mc_led_info; led_cdev = &led->mc_cdev.led_cdev; led_cdev->brightness_set_blocking = lp50xx_brightness_set; ret = devm_led_classdev_multicolor_register_ext(priv->dev, &led->mc_cdev, &init_data); if (ret) { dev_err(priv->dev, "led register err: %d\n", ret); return ret; } i++; } return 0; } static int lp50xx_probe(struct i2c_client *client) { struct lp50xx *led; int count; int ret; count = device_get_child_node_count(&client->dev); if (!count) { dev_err(&client->dev, "LEDs are not defined in device tree!"); return -ENODEV; } led = devm_kzalloc(&client->dev, struct_size(led, leds, count), GFP_KERNEL); if (!led) return -ENOMEM; mutex_init(&led->lock); led->client = client; led->dev = &client->dev; led->chip_info = device_get_match_data(&client->dev); i2c_set_clientdata(client, led); led->regmap = devm_regmap_init_i2c(client, led->chip_info->lp50xx_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 = lp50xx_reset(led); if (ret) return ret; ret = lp50xx_enable_disable(led, 1); if (ret) return ret; return lp50xx_probe_dt(led); } static void lp50xx_remove(struct i2c_client *client) { struct lp50xx *led = i2c_get_clientdata(client); int ret; ret = lp50xx_enable_disable(led, 0); if (ret) dev_err(led->dev, "Failed to disable chip\n"); if (led->regulator) { ret = regulator_disable(led->regulator); if (ret) dev_err(led->dev, "Failed to disable regulator\n"); } mutex_destroy(&led->lock); } static const struct i2c_device_id lp50xx_id[] = { { "lp5009", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5009] }, { "lp5012", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5012] }, { "lp5018", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5018] }, { "lp5024", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5024] }, { "lp5030", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5030] }, { "lp5036", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5036] }, { } }; MODULE_DEVICE_TABLE(i2c, lp50xx_id); static const struct of_device_id of_lp50xx_leds_match[] = { { .compatible = "ti,lp5009", .data = &lp50xx_chip_info_tbl[LP5009] }, { .compatible = "ti,lp5012", .data = &lp50xx_chip_info_tbl[LP5012] }, { .compatible = "ti,lp5018", .data = &lp50xx_chip_info_tbl[LP5018] }, { .compatible = "ti,lp5024", .data = &lp50xx_chip_info_tbl[LP5024] }, { .compatible = "ti,lp5030", .data = &lp50xx_chip_info_tbl[LP5030] }, { .compatible = "ti,lp5036", .data = &lp50xx_chip_info_tbl[LP5036] }, {} }; MODULE_DEVICE_TABLE(of, of_lp50xx_leds_match); static struct i2c_driver lp50xx_driver = { .driver = { .name = "lp50xx", .of_match_table = of_lp50xx_leds_match, }, .probe = lp50xx_probe, .remove = lp50xx_remove, .id_table = lp50xx_id, }; module_i2c_driver(lp50xx_driver); MODULE_DESCRIPTION("Texas Instruments LP50XX LED driver"); MODULE_AUTHOR("Dan Murphy "); MODULE_LICENSE("GPL v2");