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git://projects.qi-hardware.com/openwrt-xburst.git
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195 lines
4.5 KiB
C
195 lines
4.5 KiB
C
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/*
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* drivers/video/backlight/ubicom32lcdpowerpower.c
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* LCD power driver for the Ubicom32 platform
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*
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* (C) Copyright 2009, Ubicom, Inc.
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Ubicom32 implementation derived from (with many thanks):
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* arch/m68knommu
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* arch/blackfin
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* arch/parisc
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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/module.h>
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#include <linux/platform_device.h>
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#include <linux/lcd.h>
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#include <linux/fb.h>
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#include <linux/gpio.h>
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#include <asm/ubicom32lcdpower.h>
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#include <asm/ip5000.h>
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#define DRIVER_NAME "ubicom32lcdpower"
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struct ubicom32lcdpower_data {
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/*
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* Pointer to the platform data structure. Keep this around since we need values
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* from it to set the backlight intensity.
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*/
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const struct ubicom32lcdpower_platform_data *pdata;
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/*
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* LCD device, we have to save this for use when we remove ourselves.
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*/
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struct lcd_device *lcddev;
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};
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/*
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* ubicom32lcdpower_set_power
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*/
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static int ubicom32lcdpower_set_power(struct lcd_device *ld, int power)
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{
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struct ubicom32lcdpower_data *ud = (struct ubicom32lcdpower_data *)lcd_get_data(ld);
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if (power == FB_BLANK_UNBLANK) {
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gpio_direction_output(ud->pdata->vgh_gpio, ud->pdata->vgh_polarity);
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return 0;
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}
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gpio_direction_output(ud->pdata->vgh_gpio, !ud->pdata->vgh_polarity);
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return 0;
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}
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/*
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* ubicom32lcdpower_get_power
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*/
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static int ubicom32lcdpower_get_power(struct lcd_device *ld)
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{
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struct ubicom32lcdpower_data *ud = (struct ubicom32lcdpower_data *)lcd_get_data(ld);
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int vgh = gpio_get_value(ud->pdata->vgh_gpio);
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if ((vgh && ud->pdata->vgh_polarity) || (!vgh && !ud->pdata->vgh_polarity)) {
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return 1;
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}
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return 0;
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}
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static struct lcd_ops ubicom32lcdpower_ops = {
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.get_power = ubicom32lcdpower_get_power,
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.set_power = ubicom32lcdpower_set_power,
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};
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/*
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* ubicom32lcdpower_probe
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*/
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static int ubicom32lcdpower_probe(struct platform_device *pdev)
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{
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const struct ubicom32lcdpower_platform_data *pdata = pdev->dev.platform_data;
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struct ubicom32lcdpower_data *ud;
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struct lcd_device *lcddev;
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int retval;
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/*
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* Check to see if we have any platform data, if we don't have a LCD to control
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*/
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if (!pdata) {
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return -ENODEV;
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}
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/*
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* Allocate our private data
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*/
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ud = kzalloc(sizeof(struct ubicom32lcdpower_data), GFP_KERNEL);
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if (!ud) {
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return -ENOMEM;
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}
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ud->pdata = pdata;
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/*
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* Request our GPIOs
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*/
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retval = gpio_request(pdata->vgh_gpio, "vgh");
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if (retval) {
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dev_err(&pdev->dev, "Failed to allocate vgh GPIO\n");
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goto fail_gpio;
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}
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/*
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* Register our lcd device
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*/
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lcddev = lcd_device_register(DRIVER_NAME, &pdev->dev, ud, &ubicom32lcdpower_ops);
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if (IS_ERR(lcddev)) {
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retval = PTR_ERR(lcddev);
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goto fail;
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}
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ud->lcddev = lcddev;
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platform_set_drvdata(pdev, ud);
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ubicom32lcdpower_set_power(lcddev, FB_BLANK_UNBLANK);
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printk(KERN_INFO DRIVER_NAME ": LCD driver started\n");
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return 0;
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fail:
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gpio_free(pdata->vgh_gpio);
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fail_gpio:
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platform_set_drvdata(pdev, NULL);
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kfree(ud);
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return retval;
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}
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/*
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* ubicom32lcdpower_remove
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*/
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static int __exit ubicom32lcdpower_remove(struct platform_device *pdev)
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{
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struct ubicom32lcdpower_data *ud = platform_get_drvdata(pdev);
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lcd_device_unregister(ud->lcddev);
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platform_set_drvdata(pdev, NULL);
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kfree(ud);
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return 0;
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}
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static struct platform_driver ubicom32lcdpower_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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.remove = __exit_p(ubicom32lcdpower_remove),
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};
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/*
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* ubicom32lcdpower_init
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*/
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static int __init ubicom32lcdpower_init(void)
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{
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return platform_driver_probe(&ubicom32lcdpower_driver, ubicom32lcdpower_probe);
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}
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module_init(ubicom32lcdpower_init);
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/*
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* ubicom32lcdpower_exit
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*/
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static void __exit ubicom32lcdpower_exit(void)
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{
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platform_driver_unregister(&ubicom32lcdpower_driver);
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}
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module_exit(ubicom32lcdpower_exit);
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MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
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MODULE_DESCRIPTION("Ubicom32 lcd power driver");
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MODULE_LICENSE("GPL");
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