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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * LED driver for Mediatek MT6323 PMIC
- *
- * Copyright (C) 2017 Sean Wang <[email protected]>
- */
- #include <linux/kernel.h>
- #include <linux/leds.h>
- #include <linux/mfd/mt6323/registers.h>
- #include <linux/mfd/mt6397/core.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- /*
- * Register field for MT6323_TOP_CKPDN0 to enable
- * 32K clock common for LED device.
- */
- #define MT6323_RG_DRV_32K_CK_PDN BIT(11)
- #define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11)
- /*
- * Register field for MT6323_TOP_CKPDN2 to enable
- * individual clock for LED device.
- */
- #define MT6323_RG_ISINK_CK_PDN(i) BIT(i)
- #define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i)
- /*
- * Register field for MT6323_TOP_CKCON1 to select
- * clock source.
- */
- #define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i))
- /*
- * Register for MT6323_ISINK_CON0 to setup the
- * duty cycle of the blink.
- */
- #define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i))
- #define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8)
- #define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \
- MT6323_ISINK_DIM_DUTY_MASK)
- /* Register to setup the period of the blink. */
- #define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i))
- #define MT6323_ISINK_DIM_FSEL_MASK (0xffff)
- #define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK)
- /* Register to control the brightness. */
- #define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i))
- #define MT6323_ISINK_CH_STEP_SHIFT 12
- #define MT6323_ISINK_CH_STEP_MASK (0x7 << 12)
- #define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \
- MT6323_ISINK_CH_STEP_MASK)
- #define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1)
- #define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \
- MT6323_ISINK_SFSTR0_TC_MASK)
- #define MT6323_ISINK_SFSTR0_EN_MASK BIT(0)
- #define MT6323_ISINK_SFSTR0_EN BIT(0)
- /* Register to LED channel enablement. */
- #define MT6323_ISINK_CH_EN_MASK(i) BIT(i)
- #define MT6323_ISINK_CH_EN(i) BIT(i)
- #define MT6323_MAX_PERIOD 10000
- #define MT6323_MAX_LEDS 4
- #define MT6323_MAX_BRIGHTNESS 6
- #define MT6323_UNIT_DUTY 3125
- #define MT6323_CAL_HW_DUTY(o, p) DIV_ROUND_CLOSEST((o) * 100000ul,\
- (p) * MT6323_UNIT_DUTY)
- struct mt6323_leds;
- /**
- * struct mt6323_led - state container for the LED device
- * @id: the identifier in MT6323 LED device
- * @parent: the pointer to MT6323 LED controller
- * @cdev: LED class device for this LED device
- * @current_brightness: current state of the LED device
- */
- struct mt6323_led {
- int id;
- struct mt6323_leds *parent;
- struct led_classdev cdev;
- enum led_brightness current_brightness;
- };
- /**
- * struct mt6323_leds - state container for holding LED controller
- * of the driver
- * @dev: the device pointer
- * @hw: the underlying hardware providing shared
- * bus for the register operations
- * @lock: the lock among process context
- * @led: the array that contains the state of individual
- * LED device
- */
- struct mt6323_leds {
- struct device *dev;
- struct mt6397_chip *hw;
- /* protect among process context */
- struct mutex lock;
- struct mt6323_led *led[MT6323_MAX_LEDS];
- };
- static int mt6323_led_hw_brightness(struct led_classdev *cdev,
- enum led_brightness brightness)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- struct regmap *regmap = leds->hw->regmap;
- u32 con2_mask = 0, con2_val = 0;
- int ret;
- /*
- * Setup current output for the corresponding
- * brightness level.
- */
- con2_mask |= MT6323_ISINK_CH_STEP_MASK |
- MT6323_ISINK_SFSTR0_TC_MASK |
- MT6323_ISINK_SFSTR0_EN_MASK;
- con2_val |= MT6323_ISINK_CH_STEP(brightness - 1) |
- MT6323_ISINK_SFSTR0_TC(2) |
- MT6323_ISINK_SFSTR0_EN;
- ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id),
- con2_mask, con2_val);
- return ret;
- }
- static int mt6323_led_hw_off(struct led_classdev *cdev)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- struct regmap *regmap = leds->hw->regmap;
- unsigned int status;
- int ret;
- status = MT6323_ISINK_CH_EN(led->id);
- ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
- MT6323_ISINK_CH_EN_MASK(led->id), ~status);
- if (ret < 0)
- return ret;
- usleep_range(100, 300);
- ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
- MT6323_RG_ISINK_CK_PDN_MASK(led->id),
- MT6323_RG_ISINK_CK_PDN(led->id));
- if (ret < 0)
- return ret;
- return 0;
- }
- static enum led_brightness
- mt6323_get_led_hw_brightness(struct led_classdev *cdev)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- struct regmap *regmap = leds->hw->regmap;
- unsigned int status;
- int ret;
- ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status);
- if (ret < 0)
- return ret;
- if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id))
- return 0;
- ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status);
- if (ret < 0)
- return ret;
- if (!(status & MT6323_ISINK_CH_EN(led->id)))
- return 0;
- ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status);
- if (ret < 0)
- return ret;
- return ((status & MT6323_ISINK_CH_STEP_MASK)
- >> MT6323_ISINK_CH_STEP_SHIFT) + 1;
- }
- static int mt6323_led_hw_on(struct led_classdev *cdev,
- enum led_brightness brightness)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- struct regmap *regmap = leds->hw->regmap;
- unsigned int status;
- int ret;
- /*
- * Setup required clock source, enable the corresponding
- * clock and channel and let work with continuous blink as
- * the default.
- */
- ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1,
- MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0);
- if (ret < 0)
- return ret;
- status = MT6323_RG_ISINK_CK_PDN(led->id);
- ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
- MT6323_RG_ISINK_CK_PDN_MASK(led->id),
- ~status);
- if (ret < 0)
- return ret;
- usleep_range(100, 300);
- ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
- MT6323_ISINK_CH_EN_MASK(led->id),
- MT6323_ISINK_CH_EN(led->id));
- if (ret < 0)
- return ret;
- ret = mt6323_led_hw_brightness(cdev, brightness);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
- MT6323_ISINK_DIM_DUTY_MASK,
- MT6323_ISINK_DIM_DUTY(31));
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
- MT6323_ISINK_DIM_FSEL_MASK,
- MT6323_ISINK_DIM_FSEL(1000));
- if (ret < 0)
- return ret;
- return 0;
- }
- static int mt6323_led_set_blink(struct led_classdev *cdev,
- unsigned long *delay_on,
- unsigned long *delay_off)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- struct regmap *regmap = leds->hw->regmap;
- unsigned long period;
- u8 duty_hw;
- int ret;
- /*
- * LED subsystem requires a default user
- * friendly blink pattern for the LED so using
- * 1Hz duty cycle 50% here if without specific
- * value delay_on and delay off being assigned.
- */
- if (!*delay_on && !*delay_off) {
- *delay_on = 500;
- *delay_off = 500;
- }
- /*
- * Units are in ms, if over the hardware able
- * to support, fallback into software blink
- */
- period = *delay_on + *delay_off;
- if (period > MT6323_MAX_PERIOD)
- return -EINVAL;
- /*
- * Calculate duty_hw based on the percentage of period during
- * which the led is ON.
- */
- duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period);
- /* hardware doesn't support zero duty cycle. */
- if (!duty_hw)
- return -EINVAL;
- mutex_lock(&leds->lock);
- /*
- * Set max_brightness as the software blink behavior
- * when no blink brightness.
- */
- if (!led->current_brightness) {
- ret = mt6323_led_hw_on(cdev, cdev->max_brightness);
- if (ret < 0)
- goto out;
- led->current_brightness = cdev->max_brightness;
- }
- ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
- MT6323_ISINK_DIM_DUTY_MASK,
- MT6323_ISINK_DIM_DUTY(duty_hw - 1));
- if (ret < 0)
- goto out;
- ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
- MT6323_ISINK_DIM_FSEL_MASK,
- MT6323_ISINK_DIM_FSEL(period - 1));
- out:
- mutex_unlock(&leds->lock);
- return ret;
- }
- static int mt6323_led_set_brightness(struct led_classdev *cdev,
- enum led_brightness brightness)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- struct mt6323_leds *leds = led->parent;
- int ret;
- mutex_lock(&leds->lock);
- if (!led->current_brightness && brightness) {
- ret = mt6323_led_hw_on(cdev, brightness);
- if (ret < 0)
- goto out;
- } else if (brightness) {
- ret = mt6323_led_hw_brightness(cdev, brightness);
- if (ret < 0)
- goto out;
- } else {
- ret = mt6323_led_hw_off(cdev);
- if (ret < 0)
- goto out;
- }
- led->current_brightness = brightness;
- out:
- mutex_unlock(&leds->lock);
- return ret;
- }
- static int mt6323_led_set_dt_default(struct led_classdev *cdev,
- struct device_node *np)
- {
- struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
- const char *state;
- int ret = 0;
- state = of_get_property(np, "default-state", NULL);
- if (state) {
- if (!strcmp(state, "keep")) {
- ret = mt6323_get_led_hw_brightness(cdev);
- if (ret < 0)
- return ret;
- led->current_brightness = ret;
- ret = 0;
- } else if (!strcmp(state, "on")) {
- ret =
- mt6323_led_set_brightness(cdev, cdev->max_brightness);
- } else {
- ret = mt6323_led_set_brightness(cdev, LED_OFF);
- }
- }
- return ret;
- }
- static int mt6323_led_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct device_node *np = dev_of_node(dev);
- struct device_node *child;
- struct mt6397_chip *hw = dev_get_drvdata(dev->parent);
- struct mt6323_leds *leds;
- struct mt6323_led *led;
- int ret;
- unsigned int status;
- u32 reg;
- leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
- if (!leds)
- return -ENOMEM;
- platform_set_drvdata(pdev, leds);
- leds->dev = dev;
- /*
- * leds->hw points to the underlying bus for the register
- * controlled.
- */
- leds->hw = hw;
- mutex_init(&leds->lock);
- status = MT6323_RG_DRV_32K_CK_PDN;
- ret = regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
- MT6323_RG_DRV_32K_CK_PDN_MASK, ~status);
- if (ret < 0) {
- dev_err(leds->dev,
- "Failed to update MT6323_TOP_CKPDN0 Register\n");
- return ret;
- }
- for_each_available_child_of_node(np, child) {
- struct led_init_data init_data = {};
- ret = of_property_read_u32(child, "reg", ®);
- if (ret) {
- dev_err(dev, "Failed to read led 'reg' property\n");
- goto put_child_node;
- }
- if (reg >= MT6323_MAX_LEDS || leds->led[reg]) {
- dev_err(dev, "Invalid led reg %u\n", reg);
- ret = -EINVAL;
- goto put_child_node;
- }
- led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
- if (!led) {
- ret = -ENOMEM;
- goto put_child_node;
- }
- leds->led[reg] = led;
- leds->led[reg]->id = reg;
- leds->led[reg]->cdev.max_brightness = MT6323_MAX_BRIGHTNESS;
- leds->led[reg]->cdev.brightness_set_blocking =
- mt6323_led_set_brightness;
- leds->led[reg]->cdev.blink_set = mt6323_led_set_blink;
- leds->led[reg]->cdev.brightness_get =
- mt6323_get_led_hw_brightness;
- leds->led[reg]->parent = leds;
- ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child);
- if (ret < 0) {
- dev_err(leds->dev,
- "Failed to LED set default from devicetree\n");
- goto put_child_node;
- }
- init_data.fwnode = of_fwnode_handle(child);
- ret = devm_led_classdev_register_ext(dev, &leds->led[reg]->cdev,
- &init_data);
- if (ret) {
- dev_err(dev, "Failed to register LED: %d\n", ret);
- goto put_child_node;
- }
- }
- return 0;
- put_child_node:
- of_node_put(child);
- return ret;
- }
- static int mt6323_led_remove(struct platform_device *pdev)
- {
- struct mt6323_leds *leds = platform_get_drvdata(pdev);
- int i;
- /* Turn the LEDs off on driver removal. */
- for (i = 0 ; leds->led[i] ; i++)
- mt6323_led_hw_off(&leds->led[i]->cdev);
- regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
- MT6323_RG_DRV_32K_CK_PDN_MASK,
- MT6323_RG_DRV_32K_CK_PDN);
- mutex_destroy(&leds->lock);
- return 0;
- }
- static const struct of_device_id mt6323_led_dt_match[] = {
- { .compatible = "mediatek,mt6323-led" },
- {},
- };
- MODULE_DEVICE_TABLE(of, mt6323_led_dt_match);
- static struct platform_driver mt6323_led_driver = {
- .probe = mt6323_led_probe,
- .remove = mt6323_led_remove,
- .driver = {
- .name = "mt6323-led",
- .of_match_table = mt6323_led_dt_match,
- },
- };
- module_platform_driver(mt6323_led_driver);
- MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC");
- MODULE_AUTHOR("Sean Wang <[email protected]>");
- MODULE_LICENSE("GPL");
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