diff options
Diffstat (limited to 'drivers/leds/leds-lp50xx.c')
| -rw-r--r-- | drivers/leds/leds-lp50xx.c | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c new file mode 100644 index 000000000..28d6b39fa --- /dev/null +++ b/drivers/leds/leds-lp50xx.c @@ -0,0 +1,619 @@ +// SPDX-License-Identifier: GPL-2.0 +// TI LP50XX LED chip family driver +// Copyright (C) 2018-20 Texas Instruments Incorporated - https://www.ti.com/ + +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/leds.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> +#include <uapi/linux/uleds.h> + +#include <linux/led-class-multicolor.h> + +#include "leds.h" + +#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; + unsigned long bank_modules; + 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) + * @num_of_banked_leds: holds the number of banked 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; + int num_of_banked_leds; + + /* 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; + } + + priv->num_of_banked_leds = num_leds; + + 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 *child = NULL; + 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(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"); + goto child_out; + } + + ret = lp50xx_probe_leds(child, priv, led, ret); + if (ret) + goto child_out; + + 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) { + ret = -ENOMEM; + goto child_out; + } + + 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"); + goto child_out; + } + + 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); + goto child_out; + } + i++; + } + + return 0; + +child_out: + fwnode_handle_put(child); + return ret; +} + +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_new = 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 <dmurphy@ti.com>"); +MODULE_LICENSE("GPL v2"); |