276 lines
7.0 KiB
C
276 lines
7.0 KiB
C
/*
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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 <haojian.zhuang@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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int brightness = bl->props.brightness;
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if (bl->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.state & BL_CORE_SUSPENDED)
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brightness = 0;
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return pm860x_backlight_set(bl, brightness);
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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_cmp(np->name, 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 <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:88pm860x-backlight");
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