| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dan Murphy | 1868 | 96.49% | 1 | 50.00% |
| Jacek Anaszewski | 68 | 3.51% | 1 | 50.00% |
| Total | 1936 | 2 |
// SPDX-License-Identifier: GPL-2.0 // Flash and torch driver for Texas Instruments LM3601X LED // Flash driver chip family // Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/leds.h> #include <linux/led-class-flash.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/slab.h> #define LM3601X_LED_IR 0x0 #define LM3601X_LED_TORCH 0x1 /* Registers */ #define LM3601X_ENABLE_REG 0x01 #define LM3601X_CFG_REG 0x02 #define LM3601X_LED_FLASH_REG 0x03 #define LM3601X_LED_TORCH_REG 0x04 #define LM3601X_FLAGS_REG 0x05 #define LM3601X_DEV_ID_REG 0x06 #define LM3601X_SW_RESET BIT(7) /* Enable Mode bits */ #define LM3601X_MODE_STANDBY 0x00 #define LM3601X_MODE_IR_DRV BIT(0) #define LM3601X_MODE_TORCH BIT(1) #define LM3601X_MODE_STROBE (BIT(0) | BIT(1)) #define LM3601X_STRB_EN BIT(2) #define LM3601X_STRB_EDGE_TRIG BIT(3) #define LM3601X_IVFM_EN BIT(4) #define LM36010_BOOST_LIMIT_28 BIT(5) #define LM36010_BOOST_FREQ_4MHZ BIT(6) #define LM36010_BOOST_MODE_PASS BIT(7) /* Flag Mask */ #define LM3601X_FLASH_TIME_OUT BIT(0) #define LM3601X_UVLO_FAULT BIT(1) #define LM3601X_THERM_SHUTDOWN BIT(2) #define LM3601X_THERM_CURR BIT(3) #define LM36010_CURR_LIMIT BIT(4) #define LM3601X_SHORT_FAULT BIT(5) #define LM3601X_IVFM_TRIP BIT(6) #define LM36010_OVP_FAULT BIT(7) #define LM3601X_MAX_TORCH_I_UA 376000 #define LM3601X_MIN_TORCH_I_UA 2400 #define LM3601X_TORCH_REG_DIV 2965 #define LM3601X_MAX_STROBE_I_UA 1500000 #define LM3601X_MIN_STROBE_I_UA 11000 #define LM3601X_STROBE_REG_DIV 11800 #define LM3601X_TIMEOUT_MASK 0x1e #define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH) #define LM3601X_LOWER_STEP_US 40000 #define LM3601X_UPPER_STEP_US 200000 #define LM3601X_MIN_TIMEOUT_US 40000 #define LM3601X_MAX_TIMEOUT_US 1600000 #define LM3601X_TIMEOUT_XOVER_US 400000 enum lm3601x_type { CHIP_LM36010 = 0, CHIP_LM36011, }; /** * struct lm3601x_led - * @fled_cdev: flash LED class device pointer * @client: Pointer to the I2C client * @regmap: Devices register map * @lock: Lock for reading/writing the device * @led_name: LED label for the Torch or IR LED * @flash_timeout: the timeout for the flash * @last_flag: last known flags register value * @torch_current_max: maximum current for the torch * @flash_current_max: maximum current for the flash * @max_flash_timeout: maximum timeout for the flash * @led_mode: The mode to enable either IR or Torch */ struct lm3601x_led { struct led_classdev_flash fled_cdev; struct i2c_client *client; struct regmap *regmap; struct mutex lock; unsigned int flash_timeout; unsigned int last_flag; u32 torch_current_max; u32 flash_current_max; u32 max_flash_timeout; u32 led_mode; }; static const struct reg_default lm3601x_regmap_defs[] = { { LM3601X_ENABLE_REG, 0x20 }, { LM3601X_CFG_REG, 0x15 }, { LM3601X_LED_FLASH_REG, 0x00 }, { LM3601X_LED_TORCH_REG, 0x00 }, }; static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case LM3601X_FLAGS_REG: return true; default: return false; } } static const struct regmap_config lm3601x_regmap = { .reg_bits = 8, .val_bits = 8, .max_register = LM3601X_DEV_ID_REG, .reg_defaults = lm3601x_regmap_defs, .num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs), .cache_type = REGCACHE_RBTREE, .volatile_reg = lm3601x_volatile_reg, }; static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev) { return container_of(fled_cdev, struct lm3601x_led, fled_cdev); } static int lm3601x_read_faults(struct lm3601x_led *led) { int flags_val; int ret; ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val); if (ret < 0) return -EIO; led->last_flag = 0; if (flags_val & LM36010_OVP_FAULT) led->last_flag |= LED_FAULT_OVER_VOLTAGE; if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR)) led->last_flag |= LED_FAULT_OVER_TEMPERATURE; if (flags_val & LM3601X_SHORT_FAULT) led->last_flag |= LED_FAULT_SHORT_CIRCUIT; if (flags_val & LM36010_CURR_LIMIT) led->last_flag |= LED_FAULT_OVER_CURRENT; if (flags_val & LM3601X_UVLO_FAULT) led->last_flag |= LED_FAULT_UNDER_VOLTAGE; if (flags_val & LM3601X_IVFM_TRIP) led->last_flag |= LED_FAULT_INPUT_VOLTAGE; if (flags_val & LM3601X_THERM_SHUTDOWN) led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE; return led->last_flag; } static int lm3601x_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev); struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); int ret, led_mode_val; mutex_lock(&led->lock); ret = lm3601x_read_faults(led); if (ret < 0) goto out; if (led->led_mode == LM3601X_LED_TORCH) led_mode_val = LM3601X_MODE_TORCH; else led_mode_val = LM3601X_MODE_IR_DRV; if (brightness == LED_OFF) { ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, led_mode_val, LED_OFF); goto out; } ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness); if (ret < 0) goto out; ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, led_mode_val); out: mutex_unlock(&led->lock); return ret; } static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev, bool state) { struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); int timeout_reg_val; int current_timeout; int ret; mutex_lock(&led->lock); ret = regmap_read(led->regmap, LM3601X_CFG_REG, ¤t_timeout); if (ret < 0) goto out; if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US) timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07; else timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01; if (led->flash_timeout != current_timeout) ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG, LM3601X_TIMEOUT_MASK, timeout_reg_val); if (state) ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, LM3601X_MODE_STROBE); else ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, LM3601X_MODE_STROBE, LED_OFF); ret = lm3601x_read_faults(led); out: mutex_unlock(&led->lock); return ret; } static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness) { struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); u8 brightness_val; int ret; mutex_lock(&led->lock); ret = lm3601x_read_faults(led); if (ret < 0) goto out; if (brightness == LED_OFF) { ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, LM3601X_MODE_STROBE, LED_OFF); goto out; } brightness_val = brightness / LM3601X_STROBE_REG_DIV; ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val); out: mutex_unlock(&led->lock); return ret; } static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout) { struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); mutex_lock(&led->lock); led->flash_timeout = timeout; mutex_unlock(&led->lock); return 0; } static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) { struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); int strobe_state; int ret; mutex_lock(&led->lock); ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state); if (ret < 0) goto out; *state = strobe_state & LM3601X_MODE_STROBE; out: mutex_unlock(&led->lock); return ret; } static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault) { struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); lm3601x_read_faults(led); *fault = led->last_flag; return 0; } static const struct led_flash_ops flash_ops = { .flash_brightness_set = lm3601x_flash_brightness_set, .strobe_set = lm3601x_strobe_set, .strobe_get = lm3601x_strobe_get, .timeout_set = lm3601x_flash_timeout_set, .fault_get = lm3601x_flash_fault_get, }; static int lm3601x_register_leds(struct lm3601x_led *led, struct fwnode_handle *fwnode) { struct led_classdev *led_cdev; struct led_flash_setting *setting; struct led_init_data init_data = {}; led->fled_cdev.ops = &flash_ops; setting = &led->fled_cdev.timeout; setting->min = LM3601X_MIN_TIMEOUT_US; setting->max = led->max_flash_timeout; setting->step = LM3601X_LOWER_STEP_US; setting->val = led->max_flash_timeout; setting = &led->fled_cdev.brightness; setting->min = LM3601X_MIN_STROBE_I_UA; setting->max = led->flash_current_max; setting->step = LM3601X_TORCH_REG_DIV; setting->val = led->flash_current_max; led_cdev = &led->fled_cdev.led_cdev; led_cdev->brightness_set_blocking = lm3601x_brightness_set; led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max, LM3601X_TORCH_REG_DIV); led_cdev->flags |= LED_DEV_CAP_FLASH; init_data.fwnode = fwnode; init_data.devicename = led->client->name; init_data.default_label = (led->led_mode == LM3601X_LED_TORCH) ? "torch" : "infrared"; return led_classdev_flash_register_ext(&led->client->dev, &led->fled_cdev, &init_data); } static int lm3601x_parse_node(struct lm3601x_led *led, struct fwnode_handle **fwnode) { struct fwnode_handle *child = NULL; int ret = -ENODEV; child = device_get_next_child_node(&led->client->dev, child); if (!child) { dev_err(&led->client->dev, "No LED Child node\n"); return ret; } ret = fwnode_property_read_u32(child, "reg", &led->led_mode); if (ret) { dev_err(&led->client->dev, "reg DT property missing\n"); goto out_err; } if (led->led_mode > LM3601X_LED_TORCH || led->led_mode < LM3601X_LED_IR) { dev_warn(&led->client->dev, "Invalid led mode requested\n"); ret = -EINVAL; goto out_err; } ret = fwnode_property_read_u32(child, "led-max-microamp", &led->torch_current_max); if (ret) { dev_warn(&led->client->dev, "led-max-microamp DT property missing\n"); goto out_err; } ret = fwnode_property_read_u32(child, "flash-max-microamp", &led->flash_current_max); if (ret) { dev_warn(&led->client->dev, "flash-max-microamp DT property missing\n"); goto out_err; } ret = fwnode_property_read_u32(child, "flash-max-timeout-us", &led->max_flash_timeout); if (ret) { dev_warn(&led->client->dev, "flash-max-timeout-us DT property missing\n"); goto out_err; } *fwnode = child; out_err: fwnode_handle_put(child); return ret; } static int lm3601x_probe(struct i2c_client *client) { struct lm3601x_led *led; struct fwnode_handle *fwnode; int ret; led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; led->client = client; i2c_set_clientdata(client, led); ret = lm3601x_parse_node(led, &fwnode); if (ret) return -ENODEV; led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap); if (IS_ERR(led->regmap)) { ret = PTR_ERR(led->regmap); dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); return ret; } mutex_init(&led->lock); return lm3601x_register_leds(led, fwnode); } static int lm3601x_remove(struct i2c_client *client) { struct lm3601x_led *led = i2c_get_clientdata(client); led_classdev_flash_unregister(&led->fled_cdev); mutex_destroy(&led->lock); return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, LM3601X_ENABLE_MASK, LM3601X_MODE_STANDBY); } static const struct i2c_device_id lm3601x_id[] = { { "LM36010", CHIP_LM36010 }, { "LM36011", CHIP_LM36011 }, { } }; MODULE_DEVICE_TABLE(i2c, lm3601x_id); static const struct of_device_id of_lm3601x_leds_match[] = { { .compatible = "ti,lm36010", }, { .compatible = "ti,lm36011", }, { } }; MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match); static struct i2c_driver lm3601x_i2c_driver = { .driver = { .name = "lm3601x", .of_match_table = of_lm3601x_leds_match, }, .probe_new = lm3601x_probe, .remove = lm3601x_remove, .id_table = lm3601x_id, }; module_i2c_driver(lm3601x_i2c_driver); MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X"); MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); MODULE_LICENSE("GPL v2");
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