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@xxxxxx>
---
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, ¤t_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,
