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261 lines
6.6 KiB
261 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Backlight driver for Marvell Semiconductor 88PM8606 |
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* |
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* Copyright (C) 2009 Marvell International Ltd. |
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* Haojian Zhuang <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/fb.h> |
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#include <linux/i2c.h> |
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#include <linux/backlight.h> |
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#include <linux/mfd/88pm860x.h> |
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#include <linux/module.h> |
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#define MAX_BRIGHTNESS (0xFF) |
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#define MIN_BRIGHTNESS (0) |
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#define CURRENT_BITMASK (0x1F << 1) |
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struct pm860x_backlight_data { |
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struct pm860x_chip *chip; |
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struct i2c_client *i2c; |
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int current_brightness; |
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int port; |
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int pwm; |
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int iset; |
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int reg_duty_cycle; |
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int reg_always_on; |
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int reg_current; |
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}; |
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static int backlight_power_set(struct pm860x_chip *chip, int port, |
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int on) |
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{ |
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int ret = -EINVAL; |
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switch (port) { |
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case 0: |
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ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) : |
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pm8606_osc_disable(chip, WLED1_DUTY); |
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break; |
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case 1: |
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ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) : |
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pm8606_osc_disable(chip, WLED2_DUTY); |
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break; |
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case 2: |
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ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) : |
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pm8606_osc_disable(chip, WLED3_DUTY); |
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break; |
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} |
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return ret; |
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} |
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static int pm860x_backlight_set(struct backlight_device *bl, int brightness) |
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{ |
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struct pm860x_backlight_data *data = bl_get_data(bl); |
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struct pm860x_chip *chip = data->chip; |
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unsigned char value; |
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int ret; |
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if (brightness > MAX_BRIGHTNESS) |
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value = MAX_BRIGHTNESS; |
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else |
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value = brightness; |
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if (brightness) |
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backlight_power_set(chip, data->port, 1); |
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ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value); |
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if (ret < 0) |
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goto out; |
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if ((data->current_brightness == 0) && brightness) { |
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if (data->iset) { |
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ret = pm860x_set_bits(data->i2c, data->reg_current, |
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CURRENT_BITMASK, data->iset); |
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if (ret < 0) |
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goto out; |
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} |
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if (data->pwm) { |
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ret = pm860x_set_bits(data->i2c, PM8606_PWM, |
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PM8606_PWM_FREQ_MASK, data->pwm); |
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if (ret < 0) |
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goto out; |
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} |
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if (brightness == MAX_BRIGHTNESS) { |
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/* set WLED_ON bit as 100% */ |
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ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
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PM8606_WLED_ON, PM8606_WLED_ON); |
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} |
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} else { |
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if (brightness == MAX_BRIGHTNESS) { |
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/* set WLED_ON bit as 100% */ |
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ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
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PM8606_WLED_ON, PM8606_WLED_ON); |
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} else { |
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/* clear WLED_ON bit since it's not 100% */ |
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ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
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PM8606_WLED_ON, 0); |
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} |
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} |
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if (ret < 0) |
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goto out; |
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if (brightness == 0) |
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backlight_power_set(chip, data->port, 0); |
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dev_dbg(chip->dev, "set brightness %d\n", value); |
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data->current_brightness = value; |
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return 0; |
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out: |
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dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n", |
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value, ret); |
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return ret; |
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} |
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static int pm860x_backlight_update_status(struct backlight_device *bl) |
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{ |
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return pm860x_backlight_set(bl, backlight_get_brightness(bl)); |
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} |
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static int pm860x_backlight_get_brightness(struct backlight_device *bl) |
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{ |
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struct pm860x_backlight_data *data = bl_get_data(bl); |
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struct pm860x_chip *chip = data->chip; |
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int ret; |
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ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle); |
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if (ret < 0) |
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goto out; |
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data->current_brightness = ret; |
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dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness); |
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return data->current_brightness; |
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out: |
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return -EINVAL; |
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} |
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static const struct backlight_ops pm860x_backlight_ops = { |
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.options = BL_CORE_SUSPENDRESUME, |
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.update_status = pm860x_backlight_update_status, |
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.get_brightness = pm860x_backlight_get_brightness, |
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}; |
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#ifdef CONFIG_OF |
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static int pm860x_backlight_dt_init(struct platform_device *pdev, |
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struct pm860x_backlight_data *data, |
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char *name) |
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{ |
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struct device_node *nproot, *np; |
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int iset = 0; |
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nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights"); |
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if (!nproot) { |
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dev_err(&pdev->dev, "failed to find backlights node\n"); |
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return -ENODEV; |
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} |
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for_each_child_of_node(nproot, np) { |
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if (of_node_name_eq(np, name)) { |
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of_property_read_u32(np, "marvell,88pm860x-iset", |
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&iset); |
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data->iset = PM8606_WLED_CURRENT(iset); |
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of_property_read_u32(np, "marvell,88pm860x-pwm", |
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&data->pwm); |
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of_node_put(np); |
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break; |
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} |
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} |
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of_node_put(nproot); |
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return 0; |
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} |
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#else |
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#define pm860x_backlight_dt_init(x, y, z) (-1) |
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#endif |
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static int pm860x_backlight_probe(struct platform_device *pdev) |
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{ |
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev); |
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struct pm860x_backlight_data *data; |
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struct backlight_device *bl; |
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struct resource *res; |
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struct backlight_properties props; |
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char name[MFD_NAME_SIZE]; |
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int ret = 0; |
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data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data), |
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GFP_KERNEL); |
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if (data == NULL) |
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return -ENOMEM; |
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res = platform_get_resource_byname(pdev, IORESOURCE_REG, "duty cycle"); |
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if (!res) { |
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dev_err(&pdev->dev, "No REG resource for duty cycle\n"); |
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return -ENXIO; |
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} |
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data->reg_duty_cycle = res->start; |
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res = platform_get_resource_byname(pdev, IORESOURCE_REG, "always on"); |
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if (!res) { |
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dev_err(&pdev->dev, "No REG resource for always on\n"); |
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return -ENXIO; |
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} |
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data->reg_always_on = res->start; |
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res = platform_get_resource_byname(pdev, IORESOURCE_REG, "current"); |
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if (!res) { |
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dev_err(&pdev->dev, "No REG resource for current\n"); |
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return -ENXIO; |
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} |
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data->reg_current = res->start; |
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memset(name, 0, MFD_NAME_SIZE); |
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sprintf(name, "backlight-%d", pdev->id); |
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data->port = pdev->id; |
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data->chip = chip; |
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data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; |
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data->current_brightness = MAX_BRIGHTNESS; |
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if (pm860x_backlight_dt_init(pdev, data, name)) { |
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if (pdata) { |
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data->pwm = pdata->pwm; |
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data->iset = pdata->iset; |
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} |
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} |
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memset(&props, 0, sizeof(struct backlight_properties)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = MAX_BRIGHTNESS; |
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bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data, |
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&pm860x_backlight_ops, &props); |
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if (IS_ERR(bl)) { |
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dev_err(&pdev->dev, "failed to register backlight\n"); |
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return PTR_ERR(bl); |
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} |
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bl->props.brightness = MAX_BRIGHTNESS; |
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platform_set_drvdata(pdev, bl); |
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/* read current backlight */ |
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ret = pm860x_backlight_get_brightness(bl); |
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if (ret < 0) |
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return ret; |
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backlight_update_status(bl); |
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return 0; |
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} |
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static struct platform_driver pm860x_backlight_driver = { |
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.driver = { |
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.name = "88pm860x-backlight", |
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}, |
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.probe = pm860x_backlight_probe, |
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}; |
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module_platform_driver(pm860x_backlight_driver); |
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MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606"); |
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MODULE_AUTHOR("Haojian Zhuang <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:88pm860x-backlight");
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