diff options
Diffstat (limited to 'drivers/leds/leds-pm8058.c')
| -rw-r--r-- | drivers/leds/leds-pm8058.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/leds/leds-pm8058.c b/drivers/leds/leds-pm8058.c new file mode 100644 index 0000000000..3f49a51818 --- /dev/null +++ b/drivers/leds/leds-pm8058.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved. + */ +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/regmap.h> + +#define PM8058_LED_TYPE_COMMON 0x00 +#define PM8058_LED_TYPE_KEYPAD 0x01 +#define PM8058_LED_TYPE_FLASH 0x02 + +#define PM8058_LED_TYPE_COMMON_MASK 0xf8 +#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0 +#define PM8058_LED_TYPE_COMMON_SHIFT 3 +#define PM8058_LED_TYPE_KEYPAD_SHIFT 4 + +struct pm8058_led { + struct regmap *map; + u32 reg; + u32 ledtype; + struct led_classdev cdev; +}; + +static void pm8058_led_set(struct led_classdev *cled, + enum led_brightness value) +{ + struct pm8058_led *led; + int ret = 0; + unsigned int mask = 0; + unsigned int val = 0; + + led = container_of(cled, struct pm8058_led, cdev); + switch (led->ledtype) { + case PM8058_LED_TYPE_COMMON: + mask = PM8058_LED_TYPE_COMMON_MASK; + val = value << PM8058_LED_TYPE_COMMON_SHIFT; + break; + case PM8058_LED_TYPE_KEYPAD: + case PM8058_LED_TYPE_FLASH: + mask = PM8058_LED_TYPE_KEYPAD_MASK; + val = value << PM8058_LED_TYPE_KEYPAD_SHIFT; + break; + default: + break; + } + + ret = regmap_update_bits(led->map, led->reg, mask, val); + if (ret) + pr_err("Failed to set LED brightness\n"); +} + +static enum led_brightness pm8058_led_get(struct led_classdev *cled) +{ + struct pm8058_led *led; + int ret; + unsigned int val; + + led = container_of(cled, struct pm8058_led, cdev); + + ret = regmap_read(led->map, led->reg, &val); + if (ret) { + pr_err("Failed to get LED brightness\n"); + return LED_OFF; + } + + switch (led->ledtype) { + case PM8058_LED_TYPE_COMMON: + val &= PM8058_LED_TYPE_COMMON_MASK; + val >>= PM8058_LED_TYPE_COMMON_SHIFT; + break; + case PM8058_LED_TYPE_KEYPAD: + case PM8058_LED_TYPE_FLASH: + val &= PM8058_LED_TYPE_KEYPAD_MASK; + val >>= PM8058_LED_TYPE_KEYPAD_SHIFT; + break; + default: + val = LED_OFF; + break; + } + + return val; +} + +static int pm8058_led_probe(struct platform_device *pdev) +{ + struct led_init_data init_data = {}; + struct device *dev = &pdev->dev; + struct pm8058_led *led; + struct device_node *np; + int ret; + struct regmap *map; + enum led_brightness maxbright; + enum led_default_state state; + + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev); + + map = dev_get_regmap(dev->parent, NULL); + if (!map) { + dev_err(dev, "Parent regmap unavailable.\n"); + return -ENXIO; + } + led->map = map; + + np = dev_of_node(dev); + + ret = of_property_read_u32(np, "reg", &led->reg); + if (ret) { + dev_err(dev, "no register offset specified\n"); + return -EINVAL; + } + + led->cdev.brightness_set = pm8058_led_set; + led->cdev.brightness_get = pm8058_led_get; + if (led->ledtype == PM8058_LED_TYPE_COMMON) + maxbright = 31; /* 5 bits */ + else + maxbright = 15; /* 4 bits */ + led->cdev.max_brightness = maxbright; + + init_data.fwnode = of_fwnode_handle(np); + + state = led_init_default_state_get(init_data.fwnode); + switch (state) { + case LEDS_DEFSTATE_ON: + led->cdev.brightness = maxbright; + pm8058_led_set(&led->cdev, maxbright); + break; + case LEDS_DEFSTATE_KEEP: + led->cdev.brightness = pm8058_led_get(&led->cdev); + break; + default: + led->cdev.brightness = LED_OFF; + pm8058_led_set(&led->cdev, LED_OFF); + } + + if (led->ledtype == PM8058_LED_TYPE_KEYPAD || + led->ledtype == PM8058_LED_TYPE_FLASH) + led->cdev.flags = LED_CORE_SUSPENDRESUME; + + ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); + if (ret) + dev_err(dev, "Failed to register LED for %pOF\n", np); + + return ret; +} + +static const struct of_device_id pm8058_leds_id_table[] = { + { + .compatible = "qcom,pm8058-led", + .data = (void *)PM8058_LED_TYPE_COMMON + }, + { + .compatible = "qcom,pm8058-keypad-led", + .data = (void *)PM8058_LED_TYPE_KEYPAD + }, + { + .compatible = "qcom,pm8058-flash-led", + .data = (void *)PM8058_LED_TYPE_FLASH + }, + { }, +}; +MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); + +static struct platform_driver pm8058_led_driver = { + .probe = pm8058_led_probe, + .driver = { + .name = "pm8058-leds", + .of_match_table = pm8058_leds_id_table, + }, +}; +module_platform_driver(pm8058_led_driver); + +MODULE_DESCRIPTION("PM8058 LEDs driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:pm8058-leds"); |