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leds: tps6131x: Add support for Texas Instruments TPS6131X flash LED driver
The TPS61310/TPS61311 is a flash LED driver with I2C interface. Its power stage is capable of supplying a maximum total current of roughly 1500mA. The TPS6131x provides three constant-current sinks, capable of sinking up to 2 x 400mA (LED1 and LED3) and 800mA (LED2) in flash mode. In torch mode each sink (LED1, LED2, LED3) supports currents up to 175mA. Signed-off-by: Matthias Fend <matthias.fend@emfend.at> Link: https://lore.kernel.org/r/20250514-leds-tps6131x-v5-2-a4fb9e7f2c47@emfend.at Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Matthias Fend
Lee Jones
parent
0d12bb1a7f
commit
b338a2ae9b
4 changed files with 834 additions and 0 deletions
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@ -23925,6 +23925,13 @@ F: Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
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F: Documentation/hwmon/tps23861.rst
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F: drivers/hwmon/tps23861.c
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TEXAS INSTRUMENTS TPS6131X FLASH LED DRIVER
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M: Matthias Fend <matthias.fend@emfend.at>
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L: linux-leds@vger.kernel.org
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S: Maintained
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F: Documentation/devicetree/bindings/leds/ti,tps6131x.yaml
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F: drivers/leds/flash/leds-tps6131x.c
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TEXAS INSTRUMENTS' DAC7612 DAC DRIVER
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M: Ricardo Ribalda <ribalda@kernel.org>
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L: linux-iio@vger.kernel.org
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@ -132,4 +132,15 @@ config LEDS_SY7802
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This driver can be built as a module, it will be called "leds-sy7802".
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config LEDS_TPS6131X
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tristate "LED support for TI TPS6131x flash LED driver"
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depends on I2C && OF
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depends on GPIOLIB
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select REGMAP_I2C
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help
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This option enables support for Texas Instruments TPS61310/TPS61311
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flash LED driver.
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This driver can be built as a module, it will be called "leds-tps6131x".
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endif # LEDS_CLASS_FLASH
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@ -12,3 +12,4 @@ obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
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obj-$(CONFIG_LEDS_RT8515) += leds-rt8515.o
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obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
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obj-$(CONFIG_LEDS_SY7802) += leds-sy7802.o
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obj-$(CONFIG_LEDS_TPS6131X) += leds-tps6131x.o
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815
drivers/leds/flash/leds-tps6131x.c
Normal file
815
drivers/leds/flash/leds-tps6131x.c
Normal file
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@ -0,0 +1,815 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Texas Instruments TPS61310/TPS61311 flash LED driver with I2C interface
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*
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* Copyright 2025 Matthias Fend <matthias.fend@emfend.at>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/led-class-flash.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <media/v4l2-flash-led-class.h>
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#define TPS6131X_REG_0 0x00
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#define TPS6131X_REG_0_RESET BIT(7)
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#define TPS6131X_REG_0_DCLC13 GENMASK(5, 3)
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#define TPS6131X_REG_0_DCLC13_SHIFT 3
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#define TPS6131X_REG_0_DCLC2 GENMASK(2, 0)
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#define TPS6131X_REG_0_DCLC2_SHIFT 0
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#define TPS6131X_REG_1 0x01
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#define TPS6131X_REG_1_MODE GENMASK(7, 6)
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#define TPS6131X_REG_1_MODE_SHIFT 6
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#define TPS6131X_REG_1_FC2 GENMASK(5, 0)
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#define TPS6131X_REG_1_FC2_SHIFT 0
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#define TPS6131X_REG_2 0x02
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#define TPS6131X_REG_2_MODE GENMASK(7, 6)
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#define TPS6131X_REG_2_MODE_SHIFT 6
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#define TPS6131X_REG_2_ENVM BIT(5)
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#define TPS6131X_REG_2_FC13 GENMASK(4, 0)
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#define TPS6131X_REG_2_FC13_SHIFT 0
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#define TPS6131X_REG_3 0x03
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#define TPS6131X_REG_3_STIM GENMASK(7, 5)
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#define TPS6131X_REG_3_STIM_SHIFT 5
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#define TPS6131X_REG_3_HPFL BIT(4)
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#define TPS6131X_REG_3_SELSTIM_TO BIT(3)
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#define TPS6131X_REG_3_STT BIT(2)
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#define TPS6131X_REG_3_SFT BIT(1)
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#define TPS6131X_REG_3_TXMASK BIT(0)
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#define TPS6131X_REG_4 0x04
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#define TPS6131X_REG_4_PG BIT(7)
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#define TPS6131X_REG_4_HOTDIE_HI BIT(6)
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#define TPS6131X_REG_4_HOTDIE_LO BIT(5)
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#define TPS6131X_REG_4_ILIM BIT(4)
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#define TPS6131X_REG_4_INDC GENMASK(3, 0)
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#define TPS6131X_REG_4_INDC_SHIFT 0
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#define TPS6131X_REG_5 0x05
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#define TPS6131X_REG_5_SELFCAL BIT(7)
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#define TPS6131X_REG_5_ENPSM BIT(6)
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#define TPS6131X_REG_5_STSTRB1_DIR BIT(5)
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#define TPS6131X_REG_5_GPIO BIT(4)
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#define TPS6131X_REG_5_GPIOTYPE BIT(3)
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#define TPS6131X_REG_5_ENLED3 BIT(2)
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#define TPS6131X_REG_5_ENLED2 BIT(1)
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#define TPS6131X_REG_5_ENLED1 BIT(0)
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#define TPS6131X_REG_6 0x06
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#define TPS6131X_REG_6_ENTS BIT(7)
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#define TPS6131X_REG_6_LEDHOT BIT(6)
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#define TPS6131X_REG_6_LEDWARN BIT(5)
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#define TPS6131X_REG_6_LEDHDR BIT(4)
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#define TPS6131X_REG_6_OV GENMASK(3, 0)
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#define TPS6131X_REG_6_OV_SHIFT 0
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#define TPS6131X_REG_7 0x07
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#define TPS6131X_REG_7_ENBATMON BIT(7)
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#define TPS6131X_REG_7_BATDROOP GENMASK(6, 4)
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#define TPS6131X_REG_7_BATDROOP_SHIFT 4
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#define TPS6131X_REG_7_REVID GENMASK(2, 0)
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#define TPS6131X_REG_7_REVID_SHIFT 0
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#define TPS6131X_MAX_CHANNELS 3
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#define TPS6131X_FLASH_MAX_I_CHAN13_MA 400
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#define TPS6131X_FLASH_MAX_I_CHAN2_MA 800
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#define TPS6131X_FLASH_STEP_I_MA 25
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#define TPS6131X_TORCH_MAX_I_CHAN13_MA 175
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#define TPS6131X_TORCH_MAX_I_CHAN2_MA 175
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#define TPS6131X_TORCH_STEP_I_MA 25
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/* The torch watchdog timer must be refreshed within an interval of 13 seconds. */
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#define TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES msecs_to_jiffies(10000)
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#define UA_TO_MA(UA) ((UA) / 1000)
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enum tps6131x_mode {
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TPS6131X_MODE_SHUTDOWN = 0x0,
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TPS6131X_MODE_TORCH = 0x1,
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TPS6131X_MODE_FLASH = 0x2,
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};
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struct tps6131x {
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struct device *dev;
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struct regmap *regmap;
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struct gpio_desc *reset_gpio;
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/*
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* Registers 0, 1, 2, and 3 control parts of the controller that are not completely
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* independent of each other. Since some operations require the registers to be written in
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* a specific order to avoid unwanted side effects, they are synchronized with a lock.
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*/
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struct mutex lock; /* Hardware access lock for register 0, 1, 2 and 3 */
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struct delayed_work torch_refresh_work;
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bool valley_current_limit;
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bool chan1_en;
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bool chan2_en;
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bool chan3_en;
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struct fwnode_handle *led_node;
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u32 max_flash_current_ma;
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u32 step_flash_current_ma;
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u32 max_torch_current_ma;
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u32 step_torch_current_ma;
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u32 max_timeout_us;
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struct led_classdev_flash fled_cdev;
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struct v4l2_flash *v4l2_flash;
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};
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static struct tps6131x *fled_cdev_to_tps6131x(struct led_classdev_flash *fled_cdev)
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{
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return container_of(fled_cdev, struct tps6131x, fled_cdev);
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}
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/*
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* Register contents after a power on/reset. These values cannot be changed.
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*/
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#define TPS6131X_DCLC2_50MA 2
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#define TPS6131X_DCLC13_25MA 1
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#define TPS6131X_FC2_400MA 16
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#define TPS6131X_FC13_200MA 8
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#define TPS6131X_STIM_0_579MS_1_37MS 6
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#define TPS6131X_SELSTIM_RANGE0 0
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#define TPS6131X_INDC_OFF 0
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#define TPS6131X_OV_4950MV 9
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#define TPS6131X_BATDROOP_150MV 4
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static const struct reg_default tps6131x_regmap_defaults[] = {
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{ TPS6131X_REG_0, (TPS6131X_DCLC13_25MA << TPS6131X_REG_0_DCLC13_SHIFT) |
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(TPS6131X_DCLC2_50MA << TPS6131X_REG_0_DCLC2_SHIFT) },
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{ TPS6131X_REG_1, (TPS6131X_MODE_SHUTDOWN << TPS6131X_REG_1_MODE_SHIFT) |
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(TPS6131X_FC2_400MA << TPS6131X_REG_1_FC2_SHIFT) },
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{ TPS6131X_REG_2, (TPS6131X_MODE_SHUTDOWN << TPS6131X_REG_2_MODE_SHIFT) |
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(TPS6131X_FC13_200MA << TPS6131X_REG_2_FC13_SHIFT) },
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{ TPS6131X_REG_3, (TPS6131X_STIM_0_579MS_1_37MS << TPS6131X_REG_3_STIM_SHIFT) |
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(TPS6131X_SELSTIM_RANGE0 << TPS6131X_REG_3_SELSTIM_TO) |
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TPS6131X_REG_3_TXMASK },
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{ TPS6131X_REG_4, (TPS6131X_INDC_OFF << TPS6131X_REG_4_INDC_SHIFT) },
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{ TPS6131X_REG_5, TPS6131X_REG_5_ENPSM | TPS6131X_REG_5_STSTRB1_DIR |
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TPS6131X_REG_5_GPIOTYPE | TPS6131X_REG_5_ENLED2 },
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{ TPS6131X_REG_6, (TPS6131X_OV_4950MV << TPS6131X_REG_6_OV_SHIFT) },
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{ TPS6131X_REG_7, (TPS6131X_BATDROOP_150MV << TPS6131X_REG_7_BATDROOP_SHIFT) },
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};
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/*
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* These registers contain flags that are reset when read.
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*/
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static bool tps6131x_regmap_precious(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case TPS6131X_REG_3:
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case TPS6131X_REG_4:
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case TPS6131X_REG_6:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config tps6131x_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = TPS6131X_REG_7,
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.reg_defaults = tps6131x_regmap_defaults,
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.num_reg_defaults = ARRAY_SIZE(tps6131x_regmap_defaults),
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.cache_type = REGCACHE_FLAT,
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.precious_reg = &tps6131x_regmap_precious,
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};
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struct tps6131x_timer_config {
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u8 val;
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u8 range;
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u32 time_us;
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};
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static const struct tps6131x_timer_config tps6131x_timer_configs[] = {
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{ .val = 0, .range = 1, .time_us = 5300 },
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{ .val = 1, .range = 1, .time_us = 10700 },
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{ .val = 2, .range = 1, .time_us = 16000 },
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{ .val = 3, .range = 1, .time_us = 21300 },
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{ .val = 4, .range = 1, .time_us = 26600 },
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{ .val = 5, .range = 1, .time_us = 32000 },
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{ .val = 6, .range = 1, .time_us = 37300 },
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{ .val = 0, .range = 0, .time_us = 68200 },
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{ .val = 7, .range = 1, .time_us = 71500 },
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{ .val = 1, .range = 0, .time_us = 102200 },
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{ .val = 2, .range = 0, .time_us = 136300 },
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{ .val = 3, .range = 0, .time_us = 170400 },
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{ .val = 4, .range = 0, .time_us = 204500 },
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{ .val = 5, .range = 0, .time_us = 340800 },
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{ .val = 6, .range = 0, .time_us = 579300 },
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{ .val = 7, .range = 0, .time_us = 852000 },
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};
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static const struct tps6131x_timer_config *tps6131x_find_closest_timer_config(u32 timeout_us)
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{
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const struct tps6131x_timer_config *timer_config = &tps6131x_timer_configs[0];
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u32 diff, min_diff = U32_MAX;
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int i;
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for (i = 0; i < ARRAY_SIZE(tps6131x_timer_configs); i++) {
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diff = abs(tps6131x_timer_configs[i].time_us - timeout_us);
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if (diff < min_diff) {
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timer_config = &tps6131x_timer_configs[i];
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min_diff = diff;
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if (!min_diff)
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break;
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}
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}
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return timer_config;
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}
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static int tps6131x_reset_chip(struct tps6131x *tps6131x)
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{
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int ret;
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if (tps6131x->reset_gpio) {
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gpiod_set_value_cansleep(tps6131x->reset_gpio, 1);
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fsleep(10);
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gpiod_set_value_cansleep(tps6131x->reset_gpio, 0);
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fsleep(100);
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} else {
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ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0, TPS6131X_REG_0_RESET,
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TPS6131X_REG_0_RESET);
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if (ret)
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return ret;
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fsleep(100);
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ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0, TPS6131X_REG_0_RESET, 0);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int tps6131x_init_chip(struct tps6131x *tps6131x)
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{
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u32 val;
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int ret;
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val = tps6131x->valley_current_limit ? TPS6131X_REG_4_ILIM : 0;
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ret = regmap_write(tps6131x->regmap, TPS6131X_REG_4, val);
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if (ret)
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return ret;
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val = TPS6131X_REG_5_ENPSM | TPS6131X_REG_5_STSTRB1_DIR | TPS6131X_REG_5_GPIOTYPE;
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if (tps6131x->chan1_en)
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val |= TPS6131X_REG_5_ENLED1;
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if (tps6131x->chan2_en)
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val |= TPS6131X_REG_5_ENLED2;
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if (tps6131x->chan3_en)
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val |= TPS6131X_REG_5_ENLED3;
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ret = regmap_write(tps6131x->regmap, TPS6131X_REG_5, val);
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if (ret)
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return ret;
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val = TPS6131X_REG_6_ENTS;
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ret = regmap_write(tps6131x->regmap, TPS6131X_REG_6, val);
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if (ret)
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return ret;
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return 0;
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}
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static int tps6131x_set_mode(struct tps6131x *tps6131x, enum tps6131x_mode mode, bool force)
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{
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u8 val = mode << TPS6131X_REG_1_MODE_SHIFT;
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return regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_1, TPS6131X_REG_1_MODE, val,
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NULL, false, force);
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}
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static void tps6131x_torch_refresh_handler(struct work_struct *work)
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{
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struct tps6131x *tps6131x = container_of(work, struct tps6131x, torch_refresh_work.work);
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int ret;
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guard(mutex)(&tps6131x->lock);
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ret = tps6131x_set_mode(tps6131x, TPS6131X_MODE_TORCH, true);
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if (ret < 0) {
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dev_err(tps6131x->dev, "Failed to refresh torch watchdog timer\n");
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return;
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}
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schedule_delayed_work(&tps6131x->torch_refresh_work,
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TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES);
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}
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static int tps6131x_brightness_set(struct led_classdev *cdev, enum led_brightness brightness)
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{
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struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
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struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
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u32 num_chans, steps_chan13, steps_chan2, steps_remaining;
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u8 reg0;
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int ret;
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cancel_delayed_work_sync(&tps6131x->torch_refresh_work);
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/*
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* The brightness parameter uses the number of current steps as the unit (not the current
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* value itself). Since the reported step size can vary depending on the configuration,
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* this value must be converted into actual register steps.
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||||
*/
|
||||
steps_remaining = (brightness * tps6131x->step_torch_current_ma) / TPS6131X_TORCH_STEP_I_MA;
|
||||
|
||||
num_chans = tps6131x->chan1_en + tps6131x->chan2_en + tps6131x->chan3_en;
|
||||
|
||||
/*
|
||||
* The currents are distributed as evenly as possible across the activated channels.
|
||||
* Since channels 1 and 3 share the same register setting, they always use the same current
|
||||
* value. Channel 2 supports higher currents and thus takes over the remaining additional
|
||||
* portion that cannot be covered by the other channels.
|
||||
*/
|
||||
steps_chan13 = min_t(u32, steps_remaining / num_chans,
|
||||
TPS6131X_TORCH_MAX_I_CHAN13_MA / TPS6131X_TORCH_STEP_I_MA);
|
||||
if (tps6131x->chan1_en)
|
||||
steps_remaining -= steps_chan13;
|
||||
if (tps6131x->chan3_en)
|
||||
steps_remaining -= steps_chan13;
|
||||
|
||||
steps_chan2 = min_t(u32, steps_remaining,
|
||||
TPS6131X_TORCH_MAX_I_CHAN2_MA / TPS6131X_TORCH_STEP_I_MA);
|
||||
|
||||
guard(mutex)(&tps6131x->lock);
|
||||
|
||||
reg0 = (steps_chan13 << TPS6131X_REG_0_DCLC13_SHIFT) |
|
||||
(steps_chan2 << TPS6131X_REG_0_DCLC2_SHIFT);
|
||||
ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0,
|
||||
TPS6131X_REG_0_DCLC13 | TPS6131X_REG_0_DCLC2, reg0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = tps6131x_set_mode(tps6131x, brightness ? TPS6131X_MODE_TORCH : TPS6131X_MODE_SHUTDOWN,
|
||||
true);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* In order to use both the flash and the video light functions purely via the I2C
|
||||
* interface, STRB1 must be low. If STRB1 is low, then the video light watchdog timer
|
||||
* is also active, which puts the device into the shutdown state after around 13 seconds.
|
||||
* To prevent this, the mode must be refreshed within the watchdog timeout.
|
||||
*/
|
||||
if (brightness)
|
||||
schedule_delayed_work(&tps6131x->torch_refresh_work,
|
||||
TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
|
||||
{
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
int ret;
|
||||
|
||||
guard(mutex)(&tps6131x->lock);
|
||||
|
||||
ret = tps6131x_set_mode(tps6131x, state ? TPS6131X_MODE_FLASH : TPS6131X_MODE_SHUTDOWN,
|
||||
true);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (state) {
|
||||
ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_3, TPS6131X_REG_3_SFT,
|
||||
TPS6131X_REG_3_SFT, NULL, false, true);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_3, TPS6131X_REG_3_SFT, 0, NULL,
|
||||
false, true);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
|
||||
{
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
u32 num_chans;
|
||||
u32 steps_chan13, steps_chan2;
|
||||
u32 steps_remaining;
|
||||
int ret;
|
||||
|
||||
steps_remaining = brightness / TPS6131X_FLASH_STEP_I_MA;
|
||||
num_chans = tps6131x->chan1_en + tps6131x->chan2_en + tps6131x->chan3_en;
|
||||
steps_chan13 = min_t(u32, steps_remaining / num_chans,
|
||||
TPS6131X_FLASH_MAX_I_CHAN13_MA / TPS6131X_FLASH_STEP_I_MA);
|
||||
if (tps6131x->chan1_en)
|
||||
steps_remaining -= steps_chan13;
|
||||
if (tps6131x->chan3_en)
|
||||
steps_remaining -= steps_chan13;
|
||||
steps_chan2 = min_t(u32, steps_remaining,
|
||||
TPS6131X_FLASH_MAX_I_CHAN2_MA / TPS6131X_FLASH_STEP_I_MA);
|
||||
|
||||
guard(mutex)(&tps6131x->lock);
|
||||
|
||||
ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_2, TPS6131X_REG_2_FC13,
|
||||
steps_chan13 << TPS6131X_REG_2_FC13_SHIFT);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_1, TPS6131X_REG_1_FC2,
|
||||
steps_chan2 << TPS6131X_REG_1_FC2_SHIFT);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
fled_cdev->brightness.val = brightness;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout_us)
|
||||
{
|
||||
const struct tps6131x_timer_config *timer_config;
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
u8 reg3;
|
||||
int ret;
|
||||
|
||||
guard(mutex)(&tps6131x->lock);
|
||||
|
||||
timer_config = tps6131x_find_closest_timer_config(timeout_us);
|
||||
|
||||
reg3 = timer_config->val << TPS6131X_REG_3_STIM_SHIFT;
|
||||
if (timer_config->range)
|
||||
reg3 |= TPS6131X_REG_3_SELSTIM_TO;
|
||||
|
||||
ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_3,
|
||||
TPS6131X_REG_3_STIM | TPS6131X_REG_3_SELSTIM_TO, reg3);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
fled_cdev->timeout.val = timer_config->time_us;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
|
||||
{
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
unsigned int reg3;
|
||||
int ret;
|
||||
|
||||
ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_3, ®3);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
*state = !!(reg3 & TPS6131X_REG_3_SFT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
|
||||
{
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
unsigned int reg3, reg4, reg6;
|
||||
int ret;
|
||||
|
||||
*fault = 0;
|
||||
|
||||
ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_3, ®3);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_4, ®4);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_6, ®6);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (reg3 & TPS6131X_REG_3_HPFL)
|
||||
*fault |= LED_FAULT_SHORT_CIRCUIT;
|
||||
|
||||
if (reg3 & TPS6131X_REG_3_SELSTIM_TO)
|
||||
*fault |= LED_FAULT_TIMEOUT;
|
||||
|
||||
if (reg4 & TPS6131X_REG_4_HOTDIE_HI)
|
||||
*fault |= LED_FAULT_OVER_TEMPERATURE;
|
||||
|
||||
if (reg6 & (TPS6131X_REG_6_LEDHOT | TPS6131X_REG_6_LEDWARN))
|
||||
*fault |= LED_FAULT_LED_OVER_TEMPERATURE;
|
||||
|
||||
if (!(reg6 & TPS6131X_REG_6_LEDHDR))
|
||||
*fault |= LED_FAULT_UNDER_VOLTAGE;
|
||||
|
||||
if (reg6 & TPS6131X_REG_6_LEDHOT) {
|
||||
ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_6,
|
||||
TPS6131X_REG_6_LEDHOT, 0, NULL, false, true);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct led_flash_ops flash_ops = {
|
||||
.flash_brightness_set = tps6131x_flash_brightness_set,
|
||||
.strobe_set = tps6131x_strobe_set,
|
||||
.strobe_get = tps6131x_strobe_get,
|
||||
.timeout_set = tps6131x_flash_timeout_set,
|
||||
.fault_get = tps6131x_flash_fault_get,
|
||||
};
|
||||
|
||||
static int tps6131x_parse_node(struct tps6131x *tps6131x)
|
||||
{
|
||||
const struct tps6131x_timer_config *timer_config;
|
||||
struct device *dev = tps6131x->dev;
|
||||
u32 channels[TPS6131X_MAX_CHANNELS];
|
||||
u32 current_step_multiplier;
|
||||
u32 current_ua;
|
||||
u32 max_current_flash_ma, max_current_torch_ma;
|
||||
u32 timeout_us;
|
||||
int num_channels;
|
||||
int i;
|
||||
int ret;
|
||||
|
||||
tps6131x->valley_current_limit = device_property_read_bool(dev, "ti,valley-current-limit");
|
||||
|
||||
tps6131x->led_node = fwnode_get_next_available_child_node(dev->fwnode, NULL);
|
||||
if (!tps6131x->led_node) {
|
||||
dev_err(dev, "Missing LED node\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
num_channels = fwnode_property_count_u32(tps6131x->led_node, "led-sources");
|
||||
if (num_channels <= 0) {
|
||||
dev_err(dev, "Failed to read led-sources property\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (num_channels > TPS6131X_MAX_CHANNELS) {
|
||||
dev_err(dev, "led-sources count %u exceeds maximum channel count %u\n",
|
||||
num_channels, TPS6131X_MAX_CHANNELS);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = fwnode_property_read_u32_array(tps6131x->led_node, "led-sources", channels,
|
||||
num_channels);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Failed to read led-sources property\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
max_current_flash_ma = 0;
|
||||
max_current_torch_ma = 0;
|
||||
for (i = 0; i < num_channels; i++) {
|
||||
switch (channels[i]) {
|
||||
case 1:
|
||||
tps6131x->chan1_en = true;
|
||||
max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN13_MA;
|
||||
max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN13_MA;
|
||||
break;
|
||||
case 2:
|
||||
tps6131x->chan2_en = true;
|
||||
max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN2_MA;
|
||||
max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN2_MA;
|
||||
break;
|
||||
case 3:
|
||||
tps6131x->chan3_en = true;
|
||||
max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN13_MA;
|
||||
max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN13_MA;
|
||||
break;
|
||||
default:
|
||||
dev_err(dev, "led-source out of range [1-3]\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* If only channels 1 and 3 are used, the step size is doubled because the two channels
|
||||
* share the same current control register.
|
||||
*/
|
||||
current_step_multiplier =
|
||||
(tps6131x->chan1_en && tps6131x->chan3_en && !tps6131x->chan2_en) ? 2 : 1;
|
||||
tps6131x->step_flash_current_ma = current_step_multiplier * TPS6131X_FLASH_STEP_I_MA;
|
||||
tps6131x->step_torch_current_ma = current_step_multiplier * TPS6131X_TORCH_STEP_I_MA;
|
||||
|
||||
ret = fwnode_property_read_u32(tps6131x->led_node, "led-max-microamp", ¤t_ua);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Failed to read led-max-microamp property\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
tps6131x->max_torch_current_ma = UA_TO_MA(current_ua);
|
||||
|
||||
if (!tps6131x->max_torch_current_ma ||
|
||||
tps6131x->max_torch_current_ma > max_current_torch_ma ||
|
||||
(tps6131x->max_torch_current_ma % tps6131x->step_torch_current_ma)) {
|
||||
dev_err(dev, "led-max-microamp out of range or not a multiple of %u\n",
|
||||
tps6131x->step_torch_current_ma);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = fwnode_property_read_u32(tps6131x->led_node, "flash-max-microamp", ¤t_ua);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Failed to read flash-max-microamp property\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
tps6131x->max_flash_current_ma = UA_TO_MA(current_ua);
|
||||
|
||||
if (!tps6131x->max_flash_current_ma ||
|
||||
tps6131x->max_flash_current_ma > max_current_flash_ma ||
|
||||
(tps6131x->max_flash_current_ma % tps6131x->step_flash_current_ma)) {
|
||||
dev_err(dev, "flash-max-microamp out of range or not a multiple of %u\n",
|
||||
tps6131x->step_flash_current_ma);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = fwnode_property_read_u32(tps6131x->led_node, "flash-max-timeout-us", &timeout_us);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Failed to read flash-max-timeout-us property\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
timer_config = tps6131x_find_closest_timer_config(timeout_us);
|
||||
tps6131x->max_timeout_us = timer_config->time_us;
|
||||
|
||||
if (tps6131x->max_timeout_us != timeout_us)
|
||||
dev_warn(dev, "flash-max-timeout-us %u not supported (using %u)\n", timeout_us,
|
||||
tps6131x->max_timeout_us);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_led_class_setup(struct tps6131x *tps6131x)
|
||||
{
|
||||
const struct tps6131x_timer_config *timer_config;
|
||||
struct led_classdev *led_cdev;
|
||||
struct led_flash_setting *setting;
|
||||
struct led_init_data init_data = {};
|
||||
int ret;
|
||||
|
||||
tps6131x->fled_cdev.ops = &flash_ops;
|
||||
|
||||
setting = &tps6131x->fled_cdev.timeout;
|
||||
timer_config = tps6131x_find_closest_timer_config(0);
|
||||
setting->min = timer_config->time_us;
|
||||
setting->max = tps6131x->max_timeout_us;
|
||||
setting->step = 1; /* Only some specific time periods are supported. No fixed step size. */
|
||||
setting->val = setting->min;
|
||||
|
||||
setting = &tps6131x->fled_cdev.brightness;
|
||||
setting->min = tps6131x->step_flash_current_ma;
|
||||
setting->max = tps6131x->max_flash_current_ma;
|
||||
setting->step = tps6131x->step_flash_current_ma;
|
||||
setting->val = setting->min;
|
||||
|
||||
led_cdev = &tps6131x->fled_cdev.led_cdev;
|
||||
led_cdev->brightness_set_blocking = tps6131x_brightness_set;
|
||||
led_cdev->max_brightness = tps6131x->max_torch_current_ma;
|
||||
led_cdev->flags |= LED_DEV_CAP_FLASH;
|
||||
|
||||
init_data.fwnode = tps6131x->led_node;
|
||||
init_data.devicename = NULL;
|
||||
init_data.default_label = NULL;
|
||||
init_data.devname_mandatory = false;
|
||||
|
||||
ret = devm_led_classdev_flash_register_ext(tps6131x->dev, &tps6131x->fled_cdev,
|
||||
&init_data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
|
||||
{
|
||||
struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
|
||||
struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
|
||||
|
||||
guard(mutex)(&tps6131x->lock);
|
||||
|
||||
return tps6131x_set_mode(tps6131x, enable ? TPS6131X_MODE_FLASH : TPS6131X_MODE_SHUTDOWN,
|
||||
false);
|
||||
}
|
||||
|
||||
static const struct v4l2_flash_ops tps6131x_v4l2_flash_ops = {
|
||||
.external_strobe_set = tps6131x_flash_external_strobe_set,
|
||||
};
|
||||
|
||||
static int tps6131x_v4l2_setup(struct tps6131x *tps6131x)
|
||||
{
|
||||
struct v4l2_flash_config v4l2_cfg = { 0 };
|
||||
struct led_flash_setting *intensity = &v4l2_cfg.intensity;
|
||||
|
||||
intensity->min = tps6131x->step_torch_current_ma;
|
||||
intensity->max = tps6131x->max_torch_current_ma;
|
||||
intensity->step = tps6131x->step_torch_current_ma;
|
||||
intensity->val = intensity->min;
|
||||
|
||||
strscpy(v4l2_cfg.dev_name, tps6131x->fled_cdev.led_cdev.dev->kobj.name,
|
||||
sizeof(v4l2_cfg.dev_name));
|
||||
|
||||
v4l2_cfg.has_external_strobe = true;
|
||||
v4l2_cfg.flash_faults = LED_FAULT_TIMEOUT | LED_FAULT_OVER_TEMPERATURE |
|
||||
LED_FAULT_SHORT_CIRCUIT | LED_FAULT_UNDER_VOLTAGE |
|
||||
LED_FAULT_LED_OVER_TEMPERATURE;
|
||||
|
||||
tps6131x->v4l2_flash = v4l2_flash_init(tps6131x->dev, tps6131x->led_node,
|
||||
&tps6131x->fled_cdev, &tps6131x_v4l2_flash_ops,
|
||||
&v4l2_cfg);
|
||||
if (IS_ERR(tps6131x->v4l2_flash)) {
|
||||
dev_err(tps6131x->dev, "Failed to initialize v4l2 flash LED\n");
|
||||
return PTR_ERR(tps6131x->v4l2_flash);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tps6131x_probe(struct i2c_client *client)
|
||||
{
|
||||
struct tps6131x *tps6131x;
|
||||
int ret;
|
||||
|
||||
tps6131x = devm_kzalloc(&client->dev, sizeof(*tps6131x), GFP_KERNEL);
|
||||
if (!tps6131x)
|
||||
return -ENOMEM;
|
||||
|
||||
tps6131x->dev = &client->dev;
|
||||
i2c_set_clientdata(client, tps6131x);
|
||||
mutex_init(&tps6131x->lock);
|
||||
INIT_DELAYED_WORK(&tps6131x->torch_refresh_work, tps6131x_torch_refresh_handler);
|
||||
|
||||
ret = tps6131x_parse_node(tps6131x);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
tps6131x->regmap = devm_regmap_init_i2c(client, &tps6131x_regmap);
|
||||
if (IS_ERR(tps6131x->regmap)) {
|
||||
ret = PTR_ERR(tps6131x->regmap);
|
||||
return dev_err_probe(&client->dev, ret, "Failed to allocate register map\n");
|
||||
}
|
||||
|
||||
tps6131x->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
|
||||
if (IS_ERR(tps6131x->reset_gpio)) {
|
||||
ret = PTR_ERR(tps6131x->reset_gpio);
|
||||
return dev_err_probe(&client->dev, ret, "Failed to get reset GPIO\n");
|
||||
}
|
||||
|
||||
ret = tps6131x_reset_chip(tps6131x);
|
||||
if (ret)
|
||||
return dev_err_probe(&client->dev, ret, "Failed to reset LED controller\n");
|
||||
|
||||
ret = tps6131x_init_chip(tps6131x);
|
||||
if (ret)
|
||||
return dev_err_probe(&client->dev, ret, "Failed to initialize LED controller\n");
|
||||
|
||||
ret = tps6131x_led_class_setup(tps6131x);
|
||||
if (ret)
|
||||
return dev_err_probe(&client->dev, ret, "Failed to setup LED class\n");
|
||||
|
||||
ret = tps6131x_v4l2_setup(tps6131x);
|
||||
if (ret)
|
||||
return dev_err_probe(&client->dev, ret, "Failed to setup v4l2 flash\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void tps6131x_remove(struct i2c_client *client)
|
||||
{
|
||||
struct tps6131x *tps6131x = i2c_get_clientdata(client);
|
||||
|
||||
v4l2_flash_release(tps6131x->v4l2_flash);
|
||||
|
||||
cancel_delayed_work_sync(&tps6131x->torch_refresh_work);
|
||||
}
|
||||
|
||||
static const struct of_device_id of_tps6131x_leds_match[] = {
|
||||
{ .compatible = "ti,tps61310" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, of_tps6131x_leds_match);
|
||||
|
||||
static struct i2c_driver tps6131x_i2c_driver = {
|
||||
.driver = {
|
||||
.name = "tps6131x",
|
||||
.of_match_table = of_tps6131x_leds_match,
|
||||
},
|
||||
.probe = tps6131x_probe,
|
||||
.remove = tps6131x_remove,
|
||||
};
|
||||
module_i2c_driver(tps6131x_i2c_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Texas Instruments TPS6131X flash LED driver");
|
||||
MODULE_AUTHOR("Matthias Fend <matthias.fend@emfend.at>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Add table
Reference in a new issue