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leds: lp8864: Add support for Texas Instruments LP8864, LP8864S, LP8866 LED-backlights
Add driver for TI LP8864, LP8864S, LP8866 4/6 channel LED-backlight drivers with I2C interface. Link: https://www.ti.com/lit/gpn/lp8864-q1 Link: https://www.ti.com/lit/gpn/lp8864s-q1 Link: https://www.ti.com/lit/gpn/lp8866-q1 Link: https://www.ti.com/lit/gpn/lp8866s-q1 Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Link: https://lore.kernel.org/r/20241218210829.73191-3-alexander.sverdlin@siemens.com Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Alexander Sverdlin
Lee Jones
parent
efd435a808
commit
e14d879292
4 changed files with 316 additions and 0 deletions
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@ -23240,6 +23240,13 @@ S: Supported
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F: Documentation/devicetree/bindings/iio/dac/ti,dac7612.yaml
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F: drivers/iio/dac/ti-dac7612.c
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TEXAS INSTRUMENTS' LB8864 LED BACKLIGHT DRIVER
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M: Alexander Sverdlin <alexander.sverdlin@siemens.com>
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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/backlight/ti,lp8864.yaml
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F: drivers/leds/leds-lp8864.c
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TEXAS INSTRUMENTS' SYSTEM CONTROL INTERFACE (TISCI) PROTOCOL DRIVER
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M: Nishanth Menon <nm@ti.com>
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M: Tero Kristo <kristo@kernel.org>
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@ -513,6 +513,18 @@ config LEDS_LP8860
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on the LP8860 4 channel LED driver using the I2C communication
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bus.
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config LEDS_LP8864
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tristate "LED support for the TI LP8864/LP8866 4/6 channel LED drivers"
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depends on LEDS_CLASS && I2C && OF
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select REGMAP_I2C
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help
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If you say yes here you get support for the TI LP8864-Q1,
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LP8864S-Q1, LP8866-Q1, LP8866S-Q1 4/6 channel LED backlight
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drivers with I2C interface.
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To compile this driver as a module, choose M here: the
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module will be called leds-lp8864.
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config LEDS_CLEVO_MAIL
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tristate "Mail LED on Clevo notebook"
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depends on LEDS_CLASS && BROKEN
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@ -57,6 +57,7 @@ obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
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obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
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obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
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obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
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obj-$(CONFIG_LEDS_LP8864) += leds-lp8864.o
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obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
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obj-$(CONFIG_LEDS_MAX5970) += leds-max5970.o
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obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
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296
drivers/leds/leds-lp8864.c
Normal file
296
drivers/leds/leds-lp8864.c
Normal file
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@ -0,0 +1,296 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI LP8864/LP8866 4/6 Channel LED Driver
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*
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* Copyright (C) 2024 Siemens AG
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*
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* Based on LP8860 driver by Dan Murphy <dmurphy@ti.com>
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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/init.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#define LP8864_BRT_CONTROL 0x00
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#define LP8864_USER_CONFIG1 0x04
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#define LP8864_BRT_MODE_MASK GENMASK(9, 8)
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#define LP8864_BRT_MODE_REG BIT(9) /* Brightness control by DISPLAY_BRT reg */
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#define LP8864_SUPPLY_STATUS 0x0e
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#define LP8864_BOOST_STATUS 0x10
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#define LP8864_LED_STATUS 0x12
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#define LP8864_LED_STATUS_WR_MASK GENMASK(14, 9) /* Writeable bits in the LED_STATUS reg */
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/* Textual meaning for status bits, starting from bit 1 */
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static const char *const lp8864_supply_status_msg[] = {
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"Vin under-voltage fault",
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"Vin over-voltage fault",
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"Vdd under-voltage fault",
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"Vin over-current fault",
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"Missing charge pump fault",
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"Charge pump fault",
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"Missing boost sync fault",
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"CRC error fault ",
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};
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/* Textual meaning for status bits, starting from bit 1 */
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static const char *const lp8864_boost_status_msg[] = {
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"Boost OVP low fault",
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"Boost OVP high fault",
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"Boost over-current fault",
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"Missing boost FSET resistor fault",
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"Missing MODE SEL resistor fault",
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"Missing LED resistor fault",
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"ISET resistor short to ground fault",
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"Thermal shutdown fault",
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};
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/* Textual meaning for every register bit */
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static const char *const lp8864_led_status_msg[] = {
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"LED 1 fault",
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"LED 2 fault",
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"LED 3 fault",
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"LED 4 fault",
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"LED 5 fault",
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"LED 6 fault",
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"LED open fault",
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"LED internal short fault",
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"LED short to GND fault",
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NULL, NULL, NULL,
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"Invalid string configuration fault",
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NULL,
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"I2C time out fault",
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};
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/**
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* struct lp8864_led
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* @client: Pointer to the I2C client
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* @led_dev: led class device pointer
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* @regmap: Devices register map
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* @led_status_mask: Helps to report LED fault only once
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*/
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struct lp8864_led {
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struct i2c_client *client;
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struct led_classdev led_dev;
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struct regmap *regmap;
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u16 led_status_mask;
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};
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static int lp8864_fault_check(struct lp8864_led *led)
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{
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int ret, i;
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unsigned int val;
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ret = regmap_read(led->regmap, LP8864_SUPPLY_STATUS, &val);
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if (ret)
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goto err;
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/* Odd bits are status bits, even bits are clear bits */
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for (i = 0; i < ARRAY_SIZE(lp8864_supply_status_msg); i++)
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if (val & BIT(i * 2 + 1))
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dev_warn(&led->client->dev, "%s\n", lp8864_supply_status_msg[i]);
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/*
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* Clear bits have an index preceding the corresponding Status bits;
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* both have to be written "1" simultaneously to clear the corresponding
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* Status bit.
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*/
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if (val)
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ret = regmap_write(led->regmap, LP8864_SUPPLY_STATUS, val >> 1 | val);
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if (ret)
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goto err;
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ret = regmap_read(led->regmap, LP8864_BOOST_STATUS, &val);
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if (ret)
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goto err;
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/* Odd bits are status bits, even bits are clear bits */
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for (i = 0; i < ARRAY_SIZE(lp8864_boost_status_msg); i++)
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if (val & BIT(i * 2 + 1))
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dev_warn(&led->client->dev, "%s\n", lp8864_boost_status_msg[i]);
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if (val)
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ret = regmap_write(led->regmap, LP8864_BOOST_STATUS, val >> 1 | val);
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if (ret)
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goto err;
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ret = regmap_read(led->regmap, LP8864_LED_STATUS, &val);
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if (ret)
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goto err;
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/*
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* Clear already reported faults that maintain their value until device
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* power-down
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*/
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val &= ~led->led_status_mask;
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for (i = 0; i < ARRAY_SIZE(lp8864_led_status_msg); i++)
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if (lp8864_led_status_msg[i] && val & BIT(i))
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dev_warn(&led->client->dev, "%s\n", lp8864_led_status_msg[i]);
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/*
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* Mark those which maintain their value until device power-down as
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* "already reported"
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*/
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led->led_status_mask |= val & ~LP8864_LED_STATUS_WR_MASK;
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/*
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* Only bits 14, 12, 10 have to be cleared here, but others are RO,
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* we don't care what we write to them.
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*/
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if (val & LP8864_LED_STATUS_WR_MASK)
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ret = regmap_write(led->regmap, LP8864_LED_STATUS, val >> 1 | val);
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if (ret)
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goto err;
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return 0;
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err:
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dev_err(&led->client->dev, "Failed to read/clear faults (%pe)\n", ERR_PTR(ret));
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return ret;
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}
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static int lp8864_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brt_val)
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{
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struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);
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/* Scale 0..LED_FULL into 16-bit HW brightness */
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unsigned int val = brt_val * 0xffff / LED_FULL;
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int ret;
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ret = lp8864_fault_check(led);
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if (ret)
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return ret;
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ret = regmap_write(led->regmap, LP8864_BRT_CONTROL, val);
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if (ret)
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dev_err(&led->client->dev, "Failed to write brightness value\n");
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return ret;
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}
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static enum led_brightness lp8864_brightness_get(struct led_classdev *led_cdev)
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{
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struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);
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unsigned int val;
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int ret;
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ret = regmap_read(led->regmap, LP8864_BRT_CONTROL, &val);
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if (ret) {
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dev_err(&led->client->dev, "Failed to read brightness value\n");
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return ret;
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}
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/* Scale 16-bit HW brightness into 0..LED_FULL */
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return val * LED_FULL / 0xffff;
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}
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static const struct regmap_config lp8864_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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};
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static void lp8864_disable_gpio(void *data)
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{
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struct gpio_desc *gpio = data;
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gpiod_set_value(gpio, 0);
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}
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static int lp8864_probe(struct i2c_client *client)
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{
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int ret;
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struct lp8864_led *led;
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struct device_node *np = dev_of_node(&client->dev);
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struct device_node *child_node;
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struct led_init_data init_data = {};
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struct gpio_desc *enable_gpio;
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led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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child_node = of_get_next_available_child(np, NULL);
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if (!child_node) {
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dev_err(&client->dev, "No LED function defined\n");
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return -EINVAL;
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}
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ret = devm_regulator_get_enable_optional(&client->dev, "vled");
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if (ret && ret != -ENODEV)
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return dev_err_probe(&client->dev, ret, "Failed to enable vled regulator\n");
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enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(enable_gpio))
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return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),
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"Failed to get enable GPIO\n");
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ret = devm_add_action_or_reset(&client->dev, lp8864_disable_gpio, enable_gpio);
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if (ret)
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return ret;
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led->client = client;
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led->led_dev.brightness_set_blocking = lp8864_brightness_set;
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led->led_dev.brightness_get = lp8864_brightness_get;
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led->regmap = devm_regmap_init_i2c(client, &lp8864_regmap_config);
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if (IS_ERR(led->regmap))
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return dev_err_probe(&client->dev, PTR_ERR(led->regmap),
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"Failed to allocate regmap\n");
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/* Control brightness by DISPLAY_BRT register */
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ret = regmap_update_bits(led->regmap, LP8864_USER_CONFIG1, LP8864_BRT_MODE_MASK,
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LP8864_BRT_MODE_REG);
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if (ret) {
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dev_err(&led->client->dev, "Failed to set brightness control mode\n");
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return ret;
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}
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ret = lp8864_fault_check(led);
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if (ret)
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return ret;
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init_data.fwnode = of_fwnode_handle(child_node);
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init_data.devicename = "lp8864";
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init_data.default_label = ":display_cluster";
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ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, &init_data);
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if (ret)
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dev_err(&client->dev, "Failed to register LED device (%pe)\n", ERR_PTR(ret));
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return ret;
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}
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static const struct i2c_device_id lp8864_id[] = {
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{ "lp8864" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lp8864_id);
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static const struct of_device_id of_lp8864_leds_match[] = {
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{ .compatible = "ti,lp8864" },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_lp8864_leds_match);
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static struct i2c_driver lp8864_driver = {
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.driver = {
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.name = "lp8864",
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.of_match_table = of_lp8864_leds_match,
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},
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.probe = lp8864_probe,
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.id_table = lp8864_id,
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};
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module_i2c_driver(lp8864_driver);
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MODULE_DESCRIPTION("Texas Instruments LP8864/LP8866 LED driver");
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MODULE_AUTHOR("Alexander Sverdlin <alexander.sverdlin@siemens.com>");
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MODULE_LICENSE("GPL");
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