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    Subject[PATCH v6 2/2] leds: lm3601x: Introduce the lm3601x LED driver
    Date
    Introduce the family of LED devices that can
    drive a torch, strobe or IR LED.

    The LED driver can be configured with a strobe
    timer to execute a strobe flash. The IR LED
    brightness is controlled via the torch brightness
    register.

    The data sheet for each the LM36010 and LM36011
    LED drivers can be found here:
    http://www.ti.com/product/LM36010
    http://www.ti.com/product/LM36011

    Signed-off-by: Dan Murphy <dmurphy@ti.com>
    ---

    v6 - This driver has been heavily modified from v5. There is no longer reading
    of individual child nodes. There are too many changes to list here see -
    https://patchwork.kernel.org/patch/10392123/

    v5 - Fixed magic numbers, change reg cache type, added of_put_node to release
    the dt node ref, and I did not change the remove function to leave the LED in its
    state on driver removal - https://patchwork.kernel.org/patch/10391741/
    v4 - Fixed Cocci issue using ARRAY_SIZE - https://patchwork.kernel.org/patch/10389259/
    v3 - removed wildcard dt compatible, fixed copyright, fixed struct doc, removed
    RO registers from default, added regmap volatile for FLAGS_REG, updated regmap cache type,
    fixed unlock and extra semi colon in strobe_set, removed unnecessary out label
    in led register and fixed checking of the ret in brightness_set - https://patchwork.kernel.org/patch/10386243/
    v2 - Fixed kbuild issue and removed unused cdev_strobe - https://patchwork.kernel.org/patch/10384585/

    drivers/leds/Kconfig | 9 +
    drivers/leds/Makefile | 1 +
    drivers/leds/leds-lm3601x.c | 595 ++++++++++++++++++++++++++++++++++++
    3 files changed, 605 insertions(+)
    create mode 100644 drivers/leds/leds-lm3601x.c

    diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
    index 2c896c0e69e1..50ae536f343f 100644
    --- a/drivers/leds/Kconfig
    +++ b/drivers/leds/Kconfig
    @@ -145,6 +145,15 @@ config LEDS_LM3692X
    This option enables support for the TI LM3692x family
    of white LED string drivers used for backlighting.

    +config LEDS_LM3601X
    + tristate "LED support for LM3601x Chips"
    + depends on LEDS_CLASS && I2C && OF
    + depends on LEDS_CLASS_FLASH
    + select REGMAP_I2C
    + help
    + This option enables support for the TI LM3601x family
    + of flash, torch and indicator classes.
    +
    config LEDS_LOCOMO
    tristate "LED Support for Locomo device"
    depends on LEDS_CLASS
    diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
    index 91eca81cae82..b79807fe1b67 100644
    --- a/drivers/leds/Makefile
    +++ b/drivers/leds/Makefile
    @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
    obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
    obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
    obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
    +obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o

    # LED SPI Drivers
    obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
    diff --git a/drivers/leds/leds-lm3601x.c b/drivers/leds/leds-lm3601x.c
    new file mode 100644
    index 000000000000..fa87da5d5159
    --- /dev/null
    +++ b/drivers/leds/leds-lm3601x.c
    @@ -0,0 +1,595 @@
    +// 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>
    +#include <uapi/linux/uleds.h>
    +
    +#define LM3601X_LED_TORCH 0x0
    +#define LM3601X_LED_IR 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_LVL_TRIG ~BIT(3)
    +#define LM3601X_STRB_EDGE_TRIG BIT(3)
    +#define LM3601X_IVFM_EN BIT(4)
    +
    +#define LM36010_BOOST_LIMIT_19 ~BIT(5)
    +#define LM36010_BOOST_LIMIT_28 BIT(5)
    +#define LM36010_BOOST_FREQ_2MHZ ~BIT(6)
    +#define LM36010_BOOST_FREQ_4MHZ BIT(6)
    +#define LM36010_BOOST_MODE_NORM ~BIT(7)
    +#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_MIN_TORCH_I_UA 2400
    +#define LM3601X_MIN_STROBE_I_MA 11
    +
    +#define LM3601X_TIMEOUT_MASK 0x1e
    +#define LM3601X_ENABLE_MASK 0x03
    +
    +enum lm3601x_type {
    + CHIP_LM36010 = 0,
    + CHIP_LM36011,
    +};
    +
    +/**
    + * struct lm3601x_max_timeouts -
    + * @timeout: timeout value in ms
    + * @regval: the value of the register to write
    + */
    +struct lm3601x_max_timeouts {
    + int timeout;
    + int reg_val;
    +};
    +
    +/**
    + * struct lm3601x_led -
    + * @lock: Lock for reading/writing the device
    + * @regmap: Devices register map
    + * @client: Pointer to the I2C client
    + * @led_node: DT device node for the led
    + * @cdev_torch: led class device pointer for the torch
    + * @cdev_ir: led class device pointer for infrared
    + * @fled_cdev: flash led class device pointer
    + * @led_name: LED label for the Torch or IR LED
    + * @strobe: LED label for the strobe
    + * @last_flag: last known flags register value
    + * @strobe_timeout: the timeout for the strobe
    + * @torch_current_max: maximum current for the torch
    + * @strobe_current_max: maximum current for the strobe
    + * @max_strobe_timeout: maximum timeout for the strobe
    + * @led_mode: The mode to enable either IR or Torch
    + */
    +struct lm3601x_led {
    + struct mutex lock;
    + struct regmap *regmap;
    + struct i2c_client *client;
    +
    + struct device_node *led_node;
    +
    + struct led_classdev cdev_torch;
    + struct led_classdev cdev_ir;
    +
    + struct led_classdev_flash fled_cdev;
    +
    + char led_name[LED_MAX_NAME_SIZE];
    + char strobe[LED_MAX_NAME_SIZE];
    +
    + unsigned int last_flag;
    + unsigned int strobe_timeout;
    +
    + u32 torch_current_max;
    + u32 strobe_current_max;
    + u32 max_strobe_timeout;
    +
    + int led_mode;
    +};
    +
    +static const struct lm3601x_max_timeouts strobe_timeouts[] = {
    + { 40000, 0x00 },
    + { 80000, 0x01 },
    + { 120000, 0x02 },
    + { 160000, 0x03 },
    + { 200000, 0x04 },
    + { 240000, 0x05 },
    + { 280000, 0x06 },
    + { 320000, 0x07 },
    + { 360000, 0x08 },
    + { 400000, 0x09 },
    + { 600000, 0x0a },
    + { 800000, 0x0b },
    + { 1000000, 0x0c },
    + { 1200000, 0x0d },
    + { 1400000, 0x0e },
    + { 1600000, 0x0f },
    +};
    +
    +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 lm3601x_led *led =
    + container_of(cdev, struct lm3601x_led, cdev_torch);
    + u8 brightness_val;
    + 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;
    + }
    +
    + if (brightness == LED_ON)
    + brightness_val = LED_ON;
    + else
    + brightness_val = (brightness/2);
    +
    + ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness_val);
    + if (ret < 0)
    + goto out;
    +
    + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
    + led_mode_val,
    + 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 ret;
    + int current_timeout;
    + int reg_count;
    + int i;
    + int timeout_reg_val = 0;
    +
    + mutex_lock(&led->lock);
    +
    + ret = regmap_read(led->regmap, LM3601X_CFG_REG, &current_timeout);
    + if (ret < 0)
    + goto out;
    +
    + reg_count = ARRAY_SIZE(strobe_timeouts);
    + for (i = 0; i < reg_count; i++) {
    + if (led->strobe_timeout > strobe_timeouts[i].timeout)
    + continue;
    +
    + if (led->strobe_timeout <= strobe_timeouts[i].timeout) {
    + timeout_reg_val = (strobe_timeouts[i].reg_val << 1);
    + break;
    + }
    +
    + ret = -EINVAL;
    + goto out;
    + }
    +
    + if (led->strobe_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_STROBE,
    + 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_strobe_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;
    + u8 brightness_val;
    +
    + 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;
    + }
    +
    + if (brightness == LED_ON)
    + brightness_val = LED_ON;
    + else
    + brightness_val = (brightness/2);
    +
    + ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
    +
    +out:
    + mutex_unlock(&led->lock);
    + return ret;
    +}
    +
    +static int lm3601x_strobe_timeout_set(struct led_classdev_flash *fled_cdev,
    + u32 timeout)
    +{
    + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
    + int ret = 0;
    +
    + mutex_lock(&led->lock);
    +
    + led->strobe_timeout = timeout;
    +
    + mutex_unlock(&led->lock);
    +
    + return ret;
    +}
    +
    +static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev,
    + bool *state)
    +{
    + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
    + int ret;
    + int strobe_state;
    +
    + 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_strobe_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 strobe_ops = {
    + .strobe_set = lm3601x_strobe_set,
    + .strobe_get = lm3601x_strobe_get,
    + .timeout_set = lm3601x_strobe_timeout_set,
    + .fault_get = lm3601x_strobe_fault_get,
    +};
    +
    +static int lm3601x_register_leds(struct lm3601x_led *led)
    +{
    + struct led_classdev_flash *fled_cdev;
    + struct led_classdev *led_cdev;
    + int err = -ENODEV;
    +
    + led->cdev_torch.name = led->led_name;
    + led->cdev_torch.max_brightness = LED_FULL;
    + led->cdev_torch.brightness_set_blocking = lm3601x_brightness_set;
    + err = devm_led_classdev_register(&led->client->dev,
    + &led->cdev_torch);
    + if (err < 0)
    + return err;
    +
    + fled_cdev = &led->fled_cdev;
    + fled_cdev->ops = &strobe_ops;
    +
    + led_cdev = &fled_cdev->led_cdev;
    + led_cdev->name = led->strobe;
    + led_cdev->max_brightness = LED_FULL;
    + led_cdev->brightness_set_blocking = lm3601x_strobe_brightness_set;
    + led_cdev->flags |= LED_DEV_CAP_FLASH;
    +
    + err = led_classdev_flash_register(&led->client->dev,
    + fled_cdev);
    +
    + return err;
    +}
    +
    +static void lm3601x_init_flash_timeout(struct lm3601x_led *led)
    +{
    + struct led_flash_setting *setting;
    +
    + setting = &led->fled_cdev.timeout;
    + setting->min = strobe_timeouts[0].timeout;
    + setting->max = led->max_strobe_timeout;
    + setting->step = 40;
    + setting->val = led->max_strobe_timeout;
    +}
    +
    +static int lm3601x_parse_node(struct lm3601x_led *led,
    + struct device_node *node)
    +{
    + struct device_node *child_node;
    + const char *name;
    + char *mode_name;
    + int ret = -ENODEV;
    +
    + for_each_available_child_of_node(node, child_node) {
    + led->led_node = of_node_get(child_node);
    + if (!led->led_node) {
    + dev_err(&led->client->dev,
    + "No LED Child node\n");
    +
    + goto out_err;
    + }
    +
    + ret = of_property_read_u32(led->led_node, "led-sources",
    + &led->led_mode);
    + if (ret) {
    + dev_err(&led->client->dev,
    + "led-sources 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");
    +
    + goto out_err;
    +
    + }
    + }
    +
    + if (led->led_mode == LM3601X_LED_TORCH) {
    + ret = of_property_read_string(led->led_node, "label", &name);
    + if (!ret)
    + snprintf(led->led_name, sizeof(led->led_name),
    + "%s:%s", led->led_node->name, name);
    + else
    + snprintf(led->led_name, sizeof(led->led_name),
    + "%s:torch", led->led_node->name);
    +
    + ret = of_property_read_u32(led->led_node, "led-max-microamp",
    + &led->torch_current_max);
    + if (ret < 0) {
    + dev_warn(&led->client->dev,
    + "led-max-microamp DT property missing\n");
    +
    + goto out_err;
    + }
    +
    + mode_name = "torch";
    +
    + } else if (led->led_mode == LM3601X_LED_IR) {
    + ret = of_property_read_string(led->led_node, "label", &name);
    + if (!ret)
    + snprintf(led->led_name, sizeof(led->led_name),
    + "%s:%s", led->led_node->name, name);
    + else
    + snprintf(led->led_name, sizeof(led->led_name),
    + "%s::infrared", led->led_node->name);
    +
    + mode_name = "ir";
    +
    + } else {
    + dev_warn(&led->client->dev,
    + "No LED mode is selected exiting probe\n");
    +
    + goto out_err;
    + }
    +
    + /* Flash mode is available in IR or Torch mode so read the DT */
    + snprintf(led->strobe, sizeof(led->strobe),
    + "%s:%s:strobe", led->led_node->name, mode_name);
    +
    + ret = of_property_read_u32(led->led_node,
    + "flash-max-microamp",
    + &led->strobe_current_max);
    + if (ret < 0) {
    + dev_warn(&led->client->dev,
    + "flash-max-microamp DT property missing\n");
    + goto out_err;
    + }
    +
    + ret = of_property_read_u32(led->led_node,
    + "flash-max-timeout-us",
    + &led->max_strobe_timeout);
    + if (ret < 0) {
    + dev_warn(&led->client->dev,
    + "flash-max-timeout-us DT property missing\n");
    +
    + goto out_err;
    + }
    +
    + lm3601x_init_flash_timeout(led);
    +
    +out_err:
    + of_node_put(led->led_node);
    + return ret;
    +}
    +
    +static int lm3601x_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + struct lm3601x_led *led;
    + int err;
    +
    + led = devm_kzalloc(&client->dev,
    + sizeof(struct lm3601x_led), GFP_KERNEL);
    + if (!led)
    + return -ENOMEM;
    +
    + err = lm3601x_parse_node(led, client->dev.of_node);
    + if (err < 0)
    + return -ENODEV;
    +
    + led->client = client;
    + led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap);
    + if (IS_ERR(led->regmap)) {
    + err = PTR_ERR(led->regmap);
    + dev_err(&client->dev,
    + "Failed to allocate register map: %d\n", err);
    + return err;
    + }
    +
    + mutex_init(&led->lock);
    + i2c_set_clientdata(client, led);
    + err = lm3601x_register_leds(led);
    +
    + return err;
    +}
    +
    +static int lm3601x_remove(struct i2c_client *client)
    +{
    + struct lm3601x_led *led = i2c_get_clientdata(client);
    +
    + regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
    + LM3601X_ENABLE_MASK,
    + LM3601X_MODE_STANDBY);
    +
    + return 0;
    +}
    +
    +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 = 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");
    --
    2.17.0.582.gccdcbd54c
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