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491 lines
12 KiB
491 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* LED driver for Mediatek MT6323 PMIC |
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* |
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* Copyright (C) 2017 Sean Wang <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/leds.h> |
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#include <linux/mfd/mt6323/registers.h> |
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#include <linux/mfd/mt6397/core.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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/* |
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* Register field for MT6323_TOP_CKPDN0 to enable |
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* 32K clock common for LED device. |
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*/ |
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#define MT6323_RG_DRV_32K_CK_PDN BIT(11) |
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#define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11) |
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|
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/* |
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* Register field for MT6323_TOP_CKPDN2 to enable |
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* individual clock for LED device. |
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*/ |
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#define MT6323_RG_ISINK_CK_PDN(i) BIT(i) |
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#define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i) |
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|
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/* |
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* Register field for MT6323_TOP_CKCON1 to select |
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* clock source. |
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*/ |
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#define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i)) |
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/* |
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* Register for MT6323_ISINK_CON0 to setup the |
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* duty cycle of the blink. |
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*/ |
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#define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i)) |
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#define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8) |
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#define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \ |
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MT6323_ISINK_DIM_DUTY_MASK) |
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/* Register to setup the period of the blink. */ |
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#define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i)) |
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#define MT6323_ISINK_DIM_FSEL_MASK (0xffff) |
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#define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK) |
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|
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/* Register to control the brightness. */ |
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#define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i)) |
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#define MT6323_ISINK_CH_STEP_SHIFT 12 |
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#define MT6323_ISINK_CH_STEP_MASK (0x7 << 12) |
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#define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \ |
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MT6323_ISINK_CH_STEP_MASK) |
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#define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1) |
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#define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \ |
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MT6323_ISINK_SFSTR0_TC_MASK) |
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#define MT6323_ISINK_SFSTR0_EN_MASK BIT(0) |
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#define MT6323_ISINK_SFSTR0_EN BIT(0) |
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/* Register to LED channel enablement. */ |
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#define MT6323_ISINK_CH_EN_MASK(i) BIT(i) |
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#define MT6323_ISINK_CH_EN(i) BIT(i) |
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#define MT6323_MAX_PERIOD 10000 |
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#define MT6323_MAX_LEDS 4 |
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#define MT6323_MAX_BRIGHTNESS 6 |
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#define MT6323_UNIT_DUTY 3125 |
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#define MT6323_CAL_HW_DUTY(o, p) DIV_ROUND_CLOSEST((o) * 100000ul,\ |
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(p) * MT6323_UNIT_DUTY) |
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struct mt6323_leds; |
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/** |
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* struct mt6323_led - state container for the LED device |
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* @id: the identifier in MT6323 LED device |
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* @parent: the pointer to MT6323 LED controller |
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* @cdev: LED class device for this LED device |
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* @current_brightness: current state of the LED device |
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*/ |
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struct mt6323_led { |
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int id; |
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struct mt6323_leds *parent; |
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struct led_classdev cdev; |
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enum led_brightness current_brightness; |
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}; |
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/** |
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* struct mt6323_leds - state container for holding LED controller |
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* of the driver |
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* @dev: the device pointer |
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* @hw: the underlying hardware providing shared |
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* bus for the register operations |
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* @lock: the lock among process context |
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* @led: the array that contains the state of individual |
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* LED device |
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*/ |
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struct mt6323_leds { |
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struct device *dev; |
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struct mt6397_chip *hw; |
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/* protect among process context */ |
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struct mutex lock; |
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struct mt6323_led *led[MT6323_MAX_LEDS]; |
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}; |
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static int mt6323_led_hw_brightness(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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struct regmap *regmap = leds->hw->regmap; |
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u32 con2_mask = 0, con2_val = 0; |
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int ret; |
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/* |
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* Setup current output for the corresponding |
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* brightness level. |
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*/ |
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con2_mask |= MT6323_ISINK_CH_STEP_MASK | |
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MT6323_ISINK_SFSTR0_TC_MASK | |
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MT6323_ISINK_SFSTR0_EN_MASK; |
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con2_val |= MT6323_ISINK_CH_STEP(brightness - 1) | |
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MT6323_ISINK_SFSTR0_TC(2) | |
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MT6323_ISINK_SFSTR0_EN; |
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ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), |
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con2_mask, con2_val); |
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return ret; |
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} |
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static int mt6323_led_hw_off(struct led_classdev *cdev) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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struct regmap *regmap = leds->hw->regmap; |
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unsigned int status; |
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int ret; |
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status = MT6323_ISINK_CH_EN(led->id); |
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ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, |
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MT6323_ISINK_CH_EN_MASK(led->id), ~status); |
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if (ret < 0) |
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return ret; |
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usleep_range(100, 300); |
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ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, |
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MT6323_RG_ISINK_CK_PDN_MASK(led->id), |
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MT6323_RG_ISINK_CK_PDN(led->id)); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static enum led_brightness |
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mt6323_get_led_hw_brightness(struct led_classdev *cdev) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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struct regmap *regmap = leds->hw->regmap; |
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unsigned int status; |
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int ret; |
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ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status); |
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if (ret < 0) |
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return ret; |
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if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id)) |
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return 0; |
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ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status); |
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if (ret < 0) |
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return ret; |
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if (!(status & MT6323_ISINK_CH_EN(led->id))) |
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return 0; |
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ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status); |
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if (ret < 0) |
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return ret; |
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return ((status & MT6323_ISINK_CH_STEP_MASK) |
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>> MT6323_ISINK_CH_STEP_SHIFT) + 1; |
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} |
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static int mt6323_led_hw_on(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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struct regmap *regmap = leds->hw->regmap; |
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unsigned int status; |
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int ret; |
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/* |
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* Setup required clock source, enable the corresponding |
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* clock and channel and let work with continuous blink as |
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* the default. |
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*/ |
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ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1, |
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MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0); |
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if (ret < 0) |
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return ret; |
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status = MT6323_RG_ISINK_CK_PDN(led->id); |
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ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, |
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MT6323_RG_ISINK_CK_PDN_MASK(led->id), |
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~status); |
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if (ret < 0) |
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return ret; |
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usleep_range(100, 300); |
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ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, |
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MT6323_ISINK_CH_EN_MASK(led->id), |
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MT6323_ISINK_CH_EN(led->id)); |
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if (ret < 0) |
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return ret; |
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ret = mt6323_led_hw_brightness(cdev, brightness); |
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if (ret < 0) |
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return ret; |
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ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), |
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MT6323_ISINK_DIM_DUTY_MASK, |
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MT6323_ISINK_DIM_DUTY(31)); |
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if (ret < 0) |
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return ret; |
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ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), |
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MT6323_ISINK_DIM_FSEL_MASK, |
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MT6323_ISINK_DIM_FSEL(1000)); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int mt6323_led_set_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 mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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struct regmap *regmap = leds->hw->regmap; |
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unsigned long period; |
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u8 duty_hw; |
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int ret; |
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/* |
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* LED subsystem requires a default user |
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* friendly blink pattern for the LED so using |
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* 1Hz duty cycle 50% here if without specific |
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* value delay_on and delay off being assigned. |
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*/ |
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if (!*delay_on && !*delay_off) { |
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*delay_on = 500; |
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*delay_off = 500; |
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} |
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/* |
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* Units are in ms, if over the hardware able |
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* to support, fallback into software blink |
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*/ |
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period = *delay_on + *delay_off; |
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if (period > MT6323_MAX_PERIOD) |
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return -EINVAL; |
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/* |
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* Calculate duty_hw based on the percentage of period during |
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* which the led is ON. |
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*/ |
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duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period); |
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/* hardware doesn't support zero duty cycle. */ |
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if (!duty_hw) |
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return -EINVAL; |
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mutex_lock(&leds->lock); |
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/* |
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* Set max_brightness as the software blink behavior |
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* when no blink brightness. |
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*/ |
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if (!led->current_brightness) { |
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ret = mt6323_led_hw_on(cdev, cdev->max_brightness); |
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if (ret < 0) |
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goto out; |
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led->current_brightness = cdev->max_brightness; |
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} |
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ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), |
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MT6323_ISINK_DIM_DUTY_MASK, |
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MT6323_ISINK_DIM_DUTY(duty_hw - 1)); |
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if (ret < 0) |
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goto out; |
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ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), |
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MT6323_ISINK_DIM_FSEL_MASK, |
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MT6323_ISINK_DIM_FSEL(period - 1)); |
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out: |
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mutex_unlock(&leds->lock); |
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return ret; |
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} |
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static int mt6323_led_set_brightness(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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struct mt6323_leds *leds = led->parent; |
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int ret; |
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mutex_lock(&leds->lock); |
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if (!led->current_brightness && brightness) { |
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ret = mt6323_led_hw_on(cdev, brightness); |
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if (ret < 0) |
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goto out; |
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} else if (brightness) { |
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ret = mt6323_led_hw_brightness(cdev, brightness); |
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if (ret < 0) |
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goto out; |
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} else { |
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ret = mt6323_led_hw_off(cdev); |
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if (ret < 0) |
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goto out; |
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} |
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led->current_brightness = brightness; |
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out: |
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mutex_unlock(&leds->lock); |
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return ret; |
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} |
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static int mt6323_led_set_dt_default(struct led_classdev *cdev, |
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struct device_node *np) |
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{ |
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struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); |
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const char *state; |
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int ret = 0; |
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state = of_get_property(np, "default-state", NULL); |
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if (state) { |
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if (!strcmp(state, "keep")) { |
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ret = mt6323_get_led_hw_brightness(cdev); |
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if (ret < 0) |
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return ret; |
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led->current_brightness = ret; |
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ret = 0; |
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} else if (!strcmp(state, "on")) { |
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ret = |
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mt6323_led_set_brightness(cdev, cdev->max_brightness); |
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} else { |
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ret = mt6323_led_set_brightness(cdev, LED_OFF); |
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} |
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} |
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return ret; |
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} |
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static int mt6323_led_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev_of_node(dev); |
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struct device_node *child; |
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struct mt6397_chip *hw = dev_get_drvdata(dev->parent); |
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struct mt6323_leds *leds; |
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struct mt6323_led *led; |
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int ret; |
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unsigned int status; |
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u32 reg; |
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leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); |
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if (!leds) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, leds); |
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leds->dev = dev; |
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/* |
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* leds->hw points to the underlying bus for the register |
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* controlled. |
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*/ |
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leds->hw = hw; |
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mutex_init(&leds->lock); |
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status = MT6323_RG_DRV_32K_CK_PDN; |
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ret = regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0, |
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MT6323_RG_DRV_32K_CK_PDN_MASK, ~status); |
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if (ret < 0) { |
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dev_err(leds->dev, |
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"Failed to update MT6323_TOP_CKPDN0 Register\n"); |
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return ret; |
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} |
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for_each_available_child_of_node(np, child) { |
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struct led_init_data init_data = {}; |
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ret = of_property_read_u32(child, "reg", ®); |
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if (ret) { |
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dev_err(dev, "Failed to read led 'reg' property\n"); |
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goto put_child_node; |
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} |
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if (reg >= MT6323_MAX_LEDS || leds->led[reg]) { |
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dev_err(dev, "Invalid led reg %u\n", reg); |
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ret = -EINVAL; |
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goto put_child_node; |
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} |
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led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); |
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if (!led) { |
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ret = -ENOMEM; |
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goto put_child_node; |
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} |
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leds->led[reg] = led; |
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leds->led[reg]->id = reg; |
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leds->led[reg]->cdev.max_brightness = MT6323_MAX_BRIGHTNESS; |
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leds->led[reg]->cdev.brightness_set_blocking = |
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mt6323_led_set_brightness; |
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leds->led[reg]->cdev.blink_set = mt6323_led_set_blink; |
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leds->led[reg]->cdev.brightness_get = |
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mt6323_get_led_hw_brightness; |
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leds->led[reg]->parent = leds; |
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ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child); |
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if (ret < 0) { |
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dev_err(leds->dev, |
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"Failed to LED set default from devicetree\n"); |
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goto put_child_node; |
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} |
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init_data.fwnode = of_fwnode_handle(child); |
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ret = devm_led_classdev_register_ext(dev, &leds->led[reg]->cdev, |
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&init_data); |
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if (ret) { |
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dev_err(dev, "Failed to register LED: %d\n", ret); |
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goto put_child_node; |
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} |
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} |
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return 0; |
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put_child_node: |
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of_node_put(child); |
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return ret; |
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} |
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static int mt6323_led_remove(struct platform_device *pdev) |
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{ |
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struct mt6323_leds *leds = platform_get_drvdata(pdev); |
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int i; |
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/* Turn the LEDs off on driver removal. */ |
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for (i = 0 ; leds->led[i] ; i++) |
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mt6323_led_hw_off(&leds->led[i]->cdev); |
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regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0, |
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MT6323_RG_DRV_32K_CK_PDN_MASK, |
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MT6323_RG_DRV_32K_CK_PDN); |
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mutex_destroy(&leds->lock); |
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return 0; |
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} |
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static const struct of_device_id mt6323_led_dt_match[] = { |
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{ .compatible = "mediatek,mt6323-led" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, mt6323_led_dt_match); |
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static struct platform_driver mt6323_led_driver = { |
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.probe = mt6323_led_probe, |
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.remove = mt6323_led_remove, |
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.driver = { |
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.name = "mt6323-led", |
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.of_match_table = mt6323_led_dt_match, |
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}, |
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}; |
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module_platform_driver(mt6323_led_driver); |
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MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC"); |
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MODULE_AUTHOR("Sean Wang <[email protected]>"); |
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MODULE_LICENSE("GPL");
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