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openwrt/target/linux/xburst/patches-2.6.34/101-lcm.patch

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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
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