mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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809c03fe4c
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19098 3c298f89-4303-0410-b956-a3cf2f4a3e73
256 lines
5.7 KiB
C
256 lines
5.7 KiB
C
/*
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* Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4720/JZ4740 SoC LCD framebuffer driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/lcd.h>
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#include <linux/backlight.h>
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#include <linux/delay.h>
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struct gpm940b0 {
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struct spi_device *spi;
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struct lcd_device *lcd;
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struct backlight_device *bl;
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unsigned enabled:1;
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};
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static int gpm940b0_write_reg(struct spi_device *spi, uint8_t reg,
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uint8_t data)
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{
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uint8_t buf[2];
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buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
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buf[1] = data;
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return spi_write(spi, buf, sizeof(buf));
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}
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static void gpm940b0_power_disable(struct gpm940b0 *gpm940b0)
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{
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int ret = gpm940b0_write_reg(gpm940b0->spi, 0x5, 0xc6) ;
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if (ret < 0)
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printk("Failed to disable power: %d\n", ret);
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}
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static void gpm940b0_power_enable(struct gpm940b0 *gpm940b0)
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{
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gpm940b0_write_reg(gpm940b0->spi, 0x5, 0xc7);
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}
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static int gpm940b0_set_power(struct lcd_device *lcd, int power)
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{
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struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
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switch (power) {
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case FB_BLANK_UNBLANK:
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mdelay(20);
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gpm940b0->enabled = 1;
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gpm940b0_power_enable(gpm940b0);
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break;
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default:
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gpm940b0->enabled = 0;
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gpm940b0_power_disable(gpm940b0);
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mdelay(20);
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break;
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}
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return 0;
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}
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static int gpm940b0_set_contrast(struct lcd_device *lcd, int contrast)
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{
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struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
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gpm940b0_write_reg(gpm940b0->spi, 0x0d, contrast);
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return 0;
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}
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static int gpm940b0_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
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{
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if (mode->xres != 320 && mode->yres != 240)
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return -EINVAL;
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return 0;
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}
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/*
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int gpm940b0_bl_update_status(struct backlight_device *bl)
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{
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struct gpm940b0 *gpm940b0 = bl_get_data(bl);
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gpm940b0->reg5 &= ~0x38;
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gpm940b0->reg5 |= ((bl->props.brightness << 3) & 0x38);
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gpm940b0_write_reg(gpm940b0->spi, 0x5, gpm940b0->reg5);
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return 0;
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}*/
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static ssize_t reg_write(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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char *buf2;
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uint32_t reg = simple_strtoul(buf, &buf2, 10);
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uint32_t val = simple_strtoul(buf2 + 1, NULL, 10);
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struct gpm940b0 *gpm940b0 = dev_get_drvdata(dev);
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if (reg < 0 || val < 0)
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return -EINVAL;
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gpm940b0_write_reg(gpm940b0->spi, reg, val);
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return count;
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}
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static DEVICE_ATTR(reg, 0644, NULL, reg_write);
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static struct lcd_ops gpm940b0_lcd_ops = {
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.set_power = gpm940b0_set_power,
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.set_contrast = gpm940b0_set_contrast,
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.set_mode = gpm940b0_set_mode,
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};
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#if 0
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static struct backlight_ops gpm940b0_bl_ops = {
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/* .get_brightness = gpm940b0_bl_get_brightness,*/
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.update_status = gpm940b0_bl_update_status,
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};
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#endif
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static int __devinit gpm940b0_probe(struct spi_device *spi)
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{
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int ret;
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struct gpm940b0 *gpm940b0;
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gpm940b0 = kmalloc(sizeof(*gpm940b0), GFP_KERNEL);
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spi->bits_per_word = 8;
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ret = spi_setup(spi);
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if (ret) {
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dev_err(&spi->dev, "Failed to setup spi\n");
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goto err_free_gpm940b0;
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}
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gpm940b0->spi = spi;
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gpm940b0->lcd = lcd_device_register("gpm940b0-lcd", &spi->dev, gpm940b0,
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&gpm940b0_lcd_ops);
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if (IS_ERR(gpm940b0->lcd)) {
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ret = PTR_ERR(gpm940b0->lcd);
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dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
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goto err_free_gpm940b0;
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}
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gpm940b0->lcd->props.max_contrast = 255;
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#if 0
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gpm940b0->bl = backlight_device_register("gpm940b0-bl", &spi->dev, gpm940b0,
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&gpm940b0_bl_ops);
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if (IS_ERR(gpm940b0->bl)) {
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ret = PTR_ERR(gpm940b0->bl);
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dev_err(&spi->dev, "Failed to register backlight device: %d\n", ret);
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gpm940b0->bl = NULL;
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} else {
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gpm940b0->bl->props.max_brightness = 8;
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gpm940b0->bl->props.brightness = 0;
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gpm940b0->bl->props.power = FB_BLANK_UNBLANK;
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}
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#endif
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ret = device_create_file(&spi->dev, &dev_attr_reg);
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if (ret)
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goto err_unregister_lcd;
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gpm940b0->enabled = 1;
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dev_set_drvdata(&spi->dev, gpm940b0);
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gpm940b0_write_reg(spi, 0x13, 0x01);
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gpm940b0_write_reg(spi, 0x5, 0xc7);
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return 0;
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err_unregister_lcd:
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lcd_device_unregister(gpm940b0->lcd);
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err_free_gpm940b0:
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kfree(gpm940b0);
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return ret;
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}
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static int __devexit gpm940b0_remove(struct spi_device *spi)
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{
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struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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#if 0
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if (gpm940b0->bl)
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backlight_device_unregister(gpm940b0->bl);
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#endif
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lcd_device_unregister(gpm940b0->lcd);
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spi_set_drvdata(spi, NULL);
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kfree(gpm940b0);
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return 0;
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}
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#ifdef CONFIG_PM
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static int gpm940b0_suspend(struct spi_device *spi, pm_message_t state)
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{
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struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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if (gpm940b0->enabled) {
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gpm940b0_power_disable(gpm940b0);
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mdelay(10);
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}
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return 0;
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}
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static int gpm940b0_resume(struct spi_device *spi)
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{
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struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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if (gpm940b0->enabled)
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gpm940b0_power_enable(gpm940b0);
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return 0;
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}
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#else
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#define gpm940b0_suspend NULL
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#define gpm940b0_resume NULL
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#endif
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static struct spi_driver gpm940b0_driver = {
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.driver = {
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.name = "gpm940b0",
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.owner = THIS_MODULE,
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},
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.probe = gpm940b0_probe,
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.remove = __devexit_p(gpm940b0_remove),
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.suspend = gpm940b0_suspend,
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.resume = gpm940b0_resume,
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};
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static int __init gpm940b0_init(void)
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{
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return spi_register_driver(&gpm940b0_driver);
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}
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module_init(gpm940b0_init);
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static void __exit gpm940b0_exit(void)
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{
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return spi_unregister_driver(&gpm940b0_driver);
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}
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module_exit(gpm940b0_exit)
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MODULE_AUTHOR("Lars-Peter Clausen");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("LCD and backlight controll for Giantplus GPM940B0");
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MODULE_ALIAS("spi:gpm940b0");
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