279 lines
6.7 KiB
C
279 lines
6.7 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/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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};
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static inline int wled_a(int port)
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{
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int ret;
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ret = ((port - PM8606_BACKLIGHT1) << 1) + 2;
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return ret;
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}
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static inline int wled_b(int port)
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{
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int ret;
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ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
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return ret;
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}
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/* WLED2 & WLED3 share the same IDC */
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static inline int wled_idc(int port)
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{
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int ret;
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switch (port) {
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case PM8606_BACKLIGHT1:
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case PM8606_BACKLIGHT2:
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ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
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break;
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case PM8606_BACKLIGHT3:
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default:
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ret = ((port - PM8606_BACKLIGHT2) << 1) + 3;
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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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ret = pm860x_reg_write(data->i2c, wled_a(data->port), 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, wled_idc(data->port),
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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, wled_b(data->port),
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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, wled_b(data->port),
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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, wled_b(data->port),
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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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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 "
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"value:%d\n", 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, wled_a(data->port));
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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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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 = NULL;
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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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unsigned char value;
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char name[MFD_NAME_SIZE];
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "No I/O resource!\n");
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return -EINVAL;
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}
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pdata = pdev->dev.platform_data;
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if (pdata == NULL) {
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dev_err(&pdev->dev, "platform data isn't assigned to "
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"backlight\n");
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return -EINVAL;
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}
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data = kzalloc(sizeof(struct pm860x_backlight_data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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strncpy(name, res->name, MFD_NAME_SIZE);
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data->chip = chip;
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data->i2c = (chip->id == CHIP_PM8606) ? chip->client \
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: chip->companion;
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data->current_brightness = MAX_BRIGHTNESS;
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data->pwm = pdata->pwm;
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data->iset = pdata->iset;
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data->port = pdata->flags;
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if (data->port < 0) {
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dev_err(&pdev->dev, "wrong platform data is assigned");
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kfree(data);
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return -EINVAL;
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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 = backlight_device_register(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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kfree(data);
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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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/* Enable reference VSYS */
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ret = pm860x_reg_read(data->i2c, PM8606_VSYS);
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if (ret < 0)
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goto out;
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if ((ret & PM8606_VSYS_EN) == 0) {
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value = ret | PM8606_VSYS_EN;
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ret = pm860x_reg_write(data->i2c, PM8606_VSYS, value);
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if (ret < 0)
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goto out;
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}
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/* Enable reference OSC */
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ret = pm860x_reg_read(data->i2c, PM8606_MISC);
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if (ret < 0)
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goto out;
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if ((ret & PM8606_MISC_OSC_EN) == 0) {
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value = ret | PM8606_MISC_OSC_EN;
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ret = pm860x_reg_write(data->i2c, PM8606_MISC, value);
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if (ret < 0)
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goto out;
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}
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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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goto out;
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backlight_update_status(bl);
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return 0;
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out:
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backlight_device_unregister(bl);
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kfree(data);
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return ret;
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}
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static int pm860x_backlight_remove(struct platform_device *pdev)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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struct pm860x_backlight_data *data = bl_get_data(bl);
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backlight_device_unregister(bl);
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kfree(data);
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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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.owner = THIS_MODULE,
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},
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.probe = pm860x_backlight_probe,
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.remove = pm860x_backlight_remove,
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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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