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leds: max77705: Add LEDs support
This adds basic support for LEDs for the max77705 PMIC. Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250123-starqltechn_integration_upstream-v17-7-8b06685b6612@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Dzmitry Sankouski
Lee Jones
parent
eb79f3a5a5
commit
aebb5fc9a0
@ -14316,6 +14316,7 @@ F: Documentation/devicetree/bindings/*/maxim,max77693.yaml
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F: Documentation/devicetree/bindings/*/maxim,max77705*.yaml
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F: Documentation/devicetree/bindings/*/maxim,max77843.yaml
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F: Documentation/devicetree/bindings/clock/maxim,max77686.txt
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F: drivers/leds/leds-max77705.c
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F: drivers/*/*max77843.c
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F: drivers/*/max14577*.c
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F: drivers/*/max77686*.c
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@ -778,6 +778,14 @@ config LEDS_MAX77650
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help
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LEDs driver for MAX77650 family of PMICs from Maxim Integrated.
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config LEDS_MAX77705
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tristate "LED support for Maxim MAX77705 PMIC"
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depends on MFD_MAX77705
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depends on LEDS_CLASS
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depends on LEDS_CLASS_MULTICOLOR
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help
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LED driver for MAX77705 PMIC from Maxim Integrated.
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config LEDS_MAX8997
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tristate "LED support for MAX8997 PMIC"
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depends on LEDS_CLASS && MFD_MAX8997
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@ -61,6 +61,7 @@ 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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obj-$(CONFIG_LEDS_MAX77705) += leds-max77705.o
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obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
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obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
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obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
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275
drivers/leds/leds-max77705.c
Normal file
275
drivers/leds/leds-max77705.c
Normal file
@ -0,0 +1,275 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Based on leds-max77650 driver
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*
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* LED driver for MAXIM 77705 PMIC.
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* Copyright (C) 2025 Dzmitry Sankouski <dsankouski@gmail.org>
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*/
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#include <linux/i2c.h>
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#include <linux/led-class-multicolor.h>
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#include <linux/leds.h>
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#include <linux/mfd/max77705-private.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MAX77705_LED_NUM_LEDS 4
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#define MAX77705_LED_EN_MASK GENMASK(1, 0)
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#define MAX77705_LED_MAX_BRIGHTNESS 0xff
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#define MAX77705_LED_EN_SHIFT(reg) (reg * MAX77705_RGBLED_EN_WIDTH)
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#define MAX77705_LED_REG_BRIGHTNESS(reg) (reg + MAX77705_RGBLED_REG_LED0BRT)
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struct max77705_led {
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struct led_classdev cdev;
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struct led_classdev_mc mcdev;
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struct regmap *regmap;
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struct mc_subled *subled_info;
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};
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static const struct regmap_config max77705_leds_regmap_config = {
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.reg_base = MAX77705_RGBLED_REG_BASE,
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX77705_LED_REG_END,
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};
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static int max77705_rgb_blink(struct led_classdev *cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct max77705_led *led = container_of(cdev, struct max77705_led, cdev);
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int value, on_value, off_value;
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if (*delay_on < MAX77705_RGB_DELAY_100_STEP)
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on_value = 0;
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else if (*delay_on < MAX77705_RGB_DELAY_100_STEP_LIM)
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on_value = *delay_on / MAX77705_RGB_DELAY_100_STEP - 1;
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else if (*delay_on < MAX77705_RGB_DELAY_250_STEP_LIM)
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on_value = (*delay_on - MAX77705_RGB_DELAY_100_STEP_LIM) /
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MAX77705_RGB_DELAY_250_STEP +
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MAX77705_RGB_DELAY_100_STEP_COUNT;
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else
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on_value = 15;
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on_value <<= 4;
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if (*delay_off < 1)
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off_value = 0;
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else if (*delay_off < MAX77705_RGB_DELAY_500_STEP)
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off_value = 1;
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else if (*delay_off < MAX77705_RGB_DELAY_500_STEP_LIM)
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off_value = *delay_off / MAX77705_RGB_DELAY_500_STEP;
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else if (*delay_off < MAX77705_RGB_DELAY_1000_STEP_LIM)
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off_value = (*delay_off - MAX77705_RGB_DELAY_1000_STEP_LIM) /
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MAX77705_RGB_DELAY_1000_STEP +
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MAX77705_RGB_DELAY_500_STEP_COUNT;
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else if (*delay_off < MAX77705_RGB_DELAY_2000_STEP_LIM)
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off_value = (*delay_off - MAX77705_RGB_DELAY_2000_STEP_LIM) /
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MAX77705_RGB_DELAY_2000_STEP +
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MAX77705_RGB_DELAY_1000_STEP_COUNT;
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else
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off_value = 15;
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value = on_value | off_value;
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return regmap_write(led->regmap, MAX77705_RGBLED_REG_LEDBLNK, value);
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}
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static int max77705_led_brightness_set(struct regmap *regmap, struct mc_subled *subled,
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int num_colors)
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{
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int ret;
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for (int i = 0; i < num_colors; i++) {
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unsigned int channel, brightness;
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channel = subled[i].channel;
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brightness = subled[i].brightness;
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if (brightness == LED_OFF) {
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/* Flash OFF */
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ret = regmap_update_bits(regmap,
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MAX77705_RGBLED_REG_LEDEN,
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MAX77705_LED_EN_MASK << MAX77705_LED_EN_SHIFT(channel), 0);
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} else {
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/* Set current */
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ret = regmap_write(regmap, MAX77705_LED_REG_BRIGHTNESS(channel),
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brightness);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(regmap,
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MAX77705_RGBLED_REG_LEDEN,
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LED_ON << MAX77705_LED_EN_SHIFT(channel),
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MAX77705_LED_EN_MASK << MAX77705_LED_EN_SHIFT(channel));
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}
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}
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return ret;
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}
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static int max77705_led_brightness_set_single(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct max77705_led *led = container_of(cdev, struct max77705_led, cdev);
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led->subled_info->brightness = brightness;
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return max77705_led_brightness_set(led->regmap, led->subled_info, 1);
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}
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static int max77705_led_brightness_set_multi(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct led_classdev_mc *mcdev = lcdev_to_mccdev(cdev);
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struct max77705_led *led = container_of(mcdev, struct max77705_led, mcdev);
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led_mc_calc_color_components(mcdev, brightness);
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return max77705_led_brightness_set(led->regmap, led->mcdev.subled_info, mcdev->num_colors);
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}
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static int max77705_parse_subled(struct device *dev, struct fwnode_handle *np,
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struct mc_subled *info)
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{
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u32 color = LED_COLOR_ID_GREEN;
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u32 reg;
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int ret;
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ret = fwnode_property_read_u32(np, "reg", ®);
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if (ret || !reg || reg >= MAX77705_LED_NUM_LEDS)
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return dev_err_probe(dev, -EINVAL, "invalid \"reg\" of %pOFn\n", np);
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info->channel = reg;
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ret = fwnode_property_read_u32(np, "color", &color);
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if (ret < 0 && ret != -EINVAL)
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return dev_err_probe(dev, ret,
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"failed to parse \"color\" of %pOF\n", np);
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info->color_index = color;
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return 0;
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}
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static int max77705_add_led(struct device *dev, struct regmap *regmap, struct fwnode_handle *np)
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{
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int ret, i = 0;
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unsigned int color, reg;
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struct max77705_led *led;
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struct led_classdev *cdev;
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struct mc_subled *info;
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struct fwnode_handle *child;
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struct led_init_data init_data = {};
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led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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ret = fwnode_property_read_u32(np, "color", &color);
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if (ret < 0 && ret != -EINVAL)
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return dev_err_probe(dev, ret,
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"failed to parse \"color\" of %pOF\n", np);
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led->regmap = regmap;
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init_data.fwnode = np;
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if (color == LED_COLOR_ID_RGB) {
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int num_channels = of_get_available_child_count(to_of_node(np));
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ret = fwnode_property_read_u32(np, "reg", ®);
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if (ret || reg >= MAX77705_LED_NUM_LEDS)
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ret = -EINVAL;
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info = devm_kcalloc(dev, num_channels, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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cdev = &led->mcdev.led_cdev;
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cdev->max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
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cdev->brightness_set_blocking = max77705_led_brightness_set_multi;
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cdev->blink_set = max77705_rgb_blink;
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fwnode_for_each_available_child_node(np, child) {
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ret = max77705_parse_subled(dev, child, &info[i]);
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if (ret < 0)
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return ret;
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info[i].intensity = 0;
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i++;
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}
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led->mcdev.subled_info = info;
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led->mcdev.num_colors = num_channels;
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led->cdev = *cdev;
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ret = devm_led_classdev_multicolor_register_ext(dev, &led->mcdev, &init_data);
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if (ret)
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return ret;
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ret = max77705_led_brightness_set_multi(&led->cdev, LED_OFF);
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if (ret)
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return ret;
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} else {
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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max77705_parse_subled(dev, np, info);
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led->subled_info = info;
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led->cdev.brightness_set_blocking = max77705_led_brightness_set_single;
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led->cdev.blink_set = max77705_rgb_blink;
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led->cdev.max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
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ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
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if (ret)
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return ret;
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ret = max77705_led_brightness_set_single(&led->cdev, LED_OFF);
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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 max77705_led_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct i2c_client *i2c = to_i2c_client(pdev->dev.parent);
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struct regmap *regmap;
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int ret;
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regmap = devm_regmap_init_i2c(i2c, &max77705_leds_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap), "Failed to register LEDs regmap\n");
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device_for_each_child_node_scoped(dev, child) {
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ret = max77705_add_led(dev, regmap, child);
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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 const struct of_device_id max77705_led_of_match[] = {
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{ .compatible = "maxim,max77705-rgb" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max77705_led_of_match);
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static struct platform_driver max77705_led_driver = {
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.driver = {
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.name = "max77705-led",
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.of_match_table = max77705_led_of_match,
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},
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.probe = max77705_led_probe,
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};
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module_platform_driver(max77705_led_driver);
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MODULE_DESCRIPTION("Maxim MAX77705 LED driver");
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MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
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MODULE_LICENSE("GPL");
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@ -33,6 +33,23 @@
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#define MAX77705_SYSTEM_IRQ_SYSOVLO_INT BIT(5)
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#define MAX77705_SYSTEM_IRQ_TSHDN_INT BIT(6)
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#define MAX77705_SYSTEM_IRQ_TM_INT BIT(7)
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/* MAX77705_RGBLED_REG_LEDEN register */
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#define MAX77705_RGBLED_EN_WIDTH 2
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/* MAX77705_RGBLED_REG_LEDBLNK register */
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#define MAX77705_RGB_DELAY_100_STEP_LIM 500
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#define MAX77705_RGB_DELAY_100_STEP_COUNT 4
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#define MAX77705_RGB_DELAY_100_STEP 100
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#define MAX77705_RGB_DELAY_250_STEP_LIM 3250
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#define MAX77705_RGB_DELAY_250_STEP 250
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#define MAX77705_RGB_DELAY_500_STEP 500
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#define MAX77705_RGB_DELAY_500_STEP_COUNT 10
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#define MAX77705_RGB_DELAY_500_STEP_LIM 5000
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#define MAX77705_RGB_DELAY_1000_STEP_LIM 8000
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#define MAX77705_RGB_DELAY_1000_STEP_COUNT 13
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#define MAX77705_RGB_DELAY_1000_STEP 1000
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#define MAX77705_RGB_DELAY_2000_STEP 2000
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#define MAX77705_RGB_DELAY_2000_STEP_COUNT 13
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#define MAX77705_RGB_DELAY_2000_STEP_LIM 12000
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enum max77705_hw_rev {
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MAX77705_PASS1 = 1,
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