diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.34/101-lcm.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.34/101-lcm.patch | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.34/101-lcm.patch b/target/linux/xburst/patches-2.6.34/101-lcm.patch new file mode 100644 index 0000000000..2b17c8a448 --- /dev/null +++ b/target/linux/xburst/patches-2.6.34/101-lcm.patch @@ -0,0 +1,304 @@ +From baf5f6c4f4ec0caf5240b452b75eeab2f96d8bd4 Mon Sep 17 00:00:00 2001 +From: Lars-Peter Clausen <lars@metafoo.de> +Date: Sat, 24 Apr 2010 12:20:56 +0200 +Subject: [PATCH] Add gpm940b0 lcd driver + +--- + drivers/video/backlight/Kconfig | 7 + + drivers/video/backlight/Makefile | 1 + + drivers/video/backlight/gpm940b0.c | 253 ++++++++++++++++++++++++++++++++++++ + 3 files changed, 261 insertions(+), 0 deletions(-) + create mode 100644 drivers/video/backlight/gpm940b0.c + +diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig +index c025c84..0a61f91 100644 +--- a/drivers/video/backlight/Kconfig ++++ b/drivers/video/backlight/Kconfig +@@ -107,6 +107,13 @@ config LCD_HP700 + If you have an HP Jornada 700 series handheld (710/720/728) + say Y to enable LCD control driver. + ++config LCD_GPM940B0 ++ tristate "Giantplus GPM940B0 LCD and backlight driver" ++ depends on LCD_CLASS_DEVICE && SPI ++ default n ++ help ++ LCD and backlight driver for the Giantplus GPM940B0 LCD module. ++ + # + # Backlight + # +diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile +index 09d1f14..a03ec9c 100644 +--- a/drivers/video/backlight/Makefile ++++ b/drivers/video/backlight/Makefile +@@ -11,6 +11,7 @@ obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o + obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o + obj-$(CONFIG_LCD_TDO24M) += tdo24m.o + obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o ++obj-$(CONFIG_LCD_GPM940B0) += gpm940b0.o + + obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o + obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o +diff --git a/drivers/video/backlight/gpm940b0.c b/drivers/video/backlight/gpm940b0.c +new file mode 100644 +index 0000000..879e3ad +--- /dev/null ++++ b/drivers/video/backlight/gpm940b0.c +@@ -0,0 +1,253 @@ ++/* ++ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> ++ * Driver for Giantplus GPM940B0 LCD ++ * ++ * This program is free software; you can redistribute it and/or modify it ++ * under the terms of the GNU General Public License as published by the ++ * Free Software Foundation; either version 2 of the License, or (at your ++ * option) any later version. ++ * ++ * You should have received a copy of the GNU General Public License along ++ * with this program; if not, write to the Free Software Foundation, Inc., ++ * 675 Mass Ave, Cambridge, MA 02139, USA. ++ * ++ */ ++ ++#include <linux/module.h> ++#include <linux/spi/spi.h> ++#include <linux/lcd.h> ++#include <linux/backlight.h> ++#include <linux/delay.h> ++ ++struct gpm940b0 { ++ struct spi_device *spi; ++ struct lcd_device *lcd; ++ struct backlight_device *bl; ++ unsigned enabled:1; ++}; ++ ++static int gpm940b0_write_reg(struct spi_device *spi, uint8_t reg, ++ uint8_t data) ++{ ++ uint8_t buf[2]; ++ buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f); ++ buf[1] = data; ++ ++ return spi_write(spi, buf, sizeof(buf)); ++} ++ ++static void gpm940b0_power_disable(struct spi_device *spi) ++{ ++ int ret = gpm940b0_write_reg(spi, 0x5, 0xc6) ; ++ if (ret < 0) ++ dev_err(&spi->dev, "Failed to disable power: %d\n", ret); ++} ++ ++static void gpm940b0_power_enable(struct spi_device *spi) ++{ ++ gpm940b0_write_reg(spi, 0x5, 0xc7); ++} ++ ++ ++static int gpm940b0_set_power(struct lcd_device *lcd, int power) ++{ ++ struct gpm940b0 *gpm940b0 = lcd_get_data(lcd); ++ ++ switch (power) { ++ case FB_BLANK_UNBLANK: ++ mdelay(20); ++ gpm940b0->enabled = 1; ++ gpm940b0_power_enable(gpm940b0->spi); ++ break; ++ default: ++ gpm940b0->enabled = 0; ++ gpm940b0_power_disable(gpm940b0->spi); ++ mdelay(20); ++ break; ++ } ++ return 0; ++} ++ ++static int gpm940b0_set_contrast(struct lcd_device *lcd, int contrast) ++{ ++ struct gpm940b0 *gpm940b0 = lcd_get_data(lcd); ++ gpm940b0_write_reg(gpm940b0->spi, 0x0d, contrast); ++ return 0; ++} ++ ++static int gpm940b0_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) ++{ ++ if (mode->xres != 320 && mode->yres != 240) ++ return -EINVAL; ++ ++ return 0; ++} ++ ++static ssize_t reg_write(struct device *dev, struct device_attribute *attr, ++ const char *buf, size_t count) ++{ ++ char *buf2; ++ uint32_t reg = simple_strtoul(buf, &buf2, 10); ++ uint32_t val = simple_strtoul(buf2 + 1, NULL, 10); ++ struct gpm940b0 *gpm940b0 = dev_get_drvdata(dev); ++ ++ if (reg < 0 || val < 0) ++ return -EINVAL; ++ ++ gpm940b0_write_reg(gpm940b0->spi, reg, val); ++ return count; ++} ++ ++static DEVICE_ATTR(reg, 0644, NULL, reg_write); ++ ++static ssize_t gpm940b0_show_brightness(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ int rc = -ENXIO; ++ ++ return rc; ++} ++ ++static ssize_t gpm940b0_store_brightness(struct device *dev, ++ struct device_attribute *attr, const char *buf, size_t count) ++{ ++ char *endp; ++ struct lcd_device *ld = to_lcd_device(dev); ++ struct gpm940b0 *gpm940b0 = lcd_get_data(ld); ++ int brightness = simple_strtoul(buf, &endp, 0); ++ ++ if (brightness > 255 || brightness < 0) ++ return -EINVAL; ++ ++ gpm940b0_write_reg(gpm940b0->spi, 0x3, brightness); ++ ++ return count; ++} ++ ++ ++static DEVICE_ATTR(brightness, 0644, gpm940b0_show_brightness, ++ gpm940b0_store_brightness); ++ ++static struct lcd_ops gpm940b0_lcd_ops = { ++ .set_power = gpm940b0_set_power, ++ .set_contrast = gpm940b0_set_contrast, ++ .set_mode = gpm940b0_set_mode, ++}; ++ ++static int __devinit gpm940b0_probe(struct spi_device *spi) ++{ ++ int ret; ++ struct gpm940b0 *gpm940b0; ++ ++ gpm940b0 = kmalloc(sizeof(*gpm940b0), GFP_KERNEL); ++ ++ spi->bits_per_word = 8; ++ spi->mode = SPI_MODE_3 | SPI_3WIRE; ++ ++ ret = spi_setup(spi); ++ if (ret) { ++ dev_err(&spi->dev, "Failed to setup spi\n"); ++ goto err_free_gpm940b0; ++ } ++ ++ gpm940b0->spi = spi; ++ ++ gpm940b0->lcd = lcd_device_register("gpm940b0-lcd", &spi->dev, gpm940b0, ++ &gpm940b0_lcd_ops); ++ ++ if (IS_ERR(gpm940b0->lcd)) { ++ ret = PTR_ERR(gpm940b0->lcd); ++ dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret); ++ goto err_free_gpm940b0; ++ } ++ ++ gpm940b0->lcd->props.max_contrast = 255; ++ ++ ret = device_create_file(&spi->dev, &dev_attr_reg); ++ if (ret) ++ goto err_unregister_lcd; ++ ++ ret = device_create_file(&gpm940b0->lcd->dev, &dev_attr_brightness); ++ if (ret) ++ goto err_unregister_lcd; ++ ++ gpm940b0->enabled = 1; ++ dev_set_drvdata(&spi->dev, gpm940b0); ++ ++ gpm940b0_write_reg(spi, 0x13, 0x01); ++ gpm940b0_write_reg(spi, 0x5, 0xc7); ++ return 0; ++err_unregister_lcd: ++ lcd_device_unregister(gpm940b0->lcd); ++err_free_gpm940b0: ++ kfree(gpm940b0); ++ return ret; ++} ++ ++static int __devexit gpm940b0_remove(struct spi_device *spi) ++{ ++ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi); ++#if 0 ++ if (gpm940b0->bl) ++ backlight_device_unregister(gpm940b0->bl); ++#endif ++ ++ lcd_device_unregister(gpm940b0->lcd); ++ ++ spi_set_drvdata(spi, NULL); ++ kfree(gpm940b0); ++ return 0; ++} ++ ++#ifdef CONFIG_PM ++ ++static int gpm940b0_suspend(struct spi_device *spi, pm_message_t state) ++{ ++ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi); ++ if (gpm940b0->enabled) { ++ gpm940b0_power_disable(spi); ++ mdelay(10); ++ } ++ return 0; ++} ++ ++static int gpm940b0_resume(struct spi_device *spi) ++{ ++ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi); ++ if (gpm940b0->enabled) ++ gpm940b0_power_enable(spi); ++ return 0; ++} ++ ++#else ++#define gpm940b0_suspend NULL ++#define gpm940b0_resume NULL ++#endif ++ ++static struct spi_driver gpm940b0_driver = { ++ .driver = { ++ .name = "gpm940b0", ++ .owner = THIS_MODULE, ++ }, ++ .probe = gpm940b0_probe, ++ .remove = __devexit_p(gpm940b0_remove), ++ .suspend = gpm940b0_suspend, ++ .resume = gpm940b0_resume, ++}; ++ ++static int __init gpm940b0_init(void) ++{ ++ return spi_register_driver(&gpm940b0_driver); ++} ++module_init(gpm940b0_init); ++ ++static void __exit gpm940b0_exit(void) ++{ ++ return spi_unregister_driver(&gpm940b0_driver); ++} ++module_exit(gpm940b0_exit) ++ ++MODULE_AUTHOR("Lars-Peter Clausen"); ++MODULE_LICENSE("GPL v2"); ++MODULE_DESCRIPTION("LCD and backlight controll for Giantplus GPM940B0"); ++MODULE_ALIAS("spi:gpm940b0"); +-- +1.5.6.5 + |