From 2248fb9c47fe7e72c735d6c16aba27bf92e1673a Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Sun, 1 Aug 2010 21:19:40 +0200
Subject: [PATCH 07/21] Add ili8960 lcd driver

---
 drivers/video/backlight/Kconfig   |    7 +
 drivers/video/backlight/Makefile  |    1 +
 drivers/video/backlight/ili8960.c |  263 +++++++++++++++++++++++++++++++++++++
 3 files changed, 271 insertions(+), 0 deletions(-)
 create mode 100644 drivers/video/backlight/ili8960.c

--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -59,6 +59,13 @@ config LCD_LTV350QV
 
 	  The LTV350QV panel is present on all ATSTK1000 boards.
 
+config LCD_ILI8960
+	tristate "Ilitek ili8960 LCD driver"
+	depends on LCD_CLASS_DEVICE && SPI
+	default n
+	help
+	  Driver for the Ilitek ili8960 LCD controller chip.
+
 config LCD_ILI9320
 	tristate
 	help
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700)		   += jornada72
 obj-$(CONFIG_LCD_L4F00242T03)	   += l4f00242t03.o
 obj-$(CONFIG_LCD_LMS283GF05)	   += lms283gf05.o
 obj-$(CONFIG_LCD_LTV350QV)	   += ltv350qv.o
+obj-$(CONFIG_LCD_ILI8960)	   += ili8960.o
 obj-$(CONFIG_LCD_ILI9320)	   += ili9320.o
 obj-$(CONFIG_LCD_PLATFORM)	   += platform_lcd.o
 obj-$(CONFIG_LCD_VGG2432A4)	   += vgg2432a4.o
--- /dev/null
+++ b/drivers/video/backlight/ili8960.c
@@ -0,0 +1,263 @@
+/*
+ *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ *  Driver for Ilitek ili8960 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 ili8960 {
+	struct spi_device *spi;
+	struct lcd_device *lcd;
+	struct backlight_device *bl;
+	bool enabled;
+	unsigned int brightness;
+};
+
+#define ILI8960_REG_BRIGHTNESS	0x03
+#define ILI8960_REG_POWER	0x05
+#define ILI8960_REG_CONTRAST	0x0d
+
+static int ili8960_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 int ili8960_programm_power(struct spi_device *spi, bool enabled)
+{
+	int ret;
+
+	if (enabled)
+		mdelay(20);
+
+	ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
+
+	if (!enabled)
+		mdelay(20);
+
+	return ret;
+}
+
+static int ili8960_set_power(struct lcd_device *lcd, int power)
+{
+	struct ili8960 *ili8960 = lcd_get_data(lcd);
+
+	switch (power) {
+	case FB_BLANK_UNBLANK:
+		ili8960->enabled = true;
+		break;
+	default:
+		ili8960->enabled = false;
+		break;
+	}
+
+	return ili8960_programm_power(ili8960->spi, ili8960->enabled);
+}
+
+static int ili8960_get_power(struct lcd_device *lcd)
+{
+	struct ili8960 *ili8960 = lcd_get_data(lcd);
+	return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+}
+
+static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
+{
+	struct ili8960 *ili8960 = lcd_get_data(lcd);
+
+	return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
+}
+
+static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
+{
+	if (mode->xres != 320 && mode->yres != 240)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
+{
+	int ret;
+
+	ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
+
+	if (ret == 0)
+		ili8960->brightness = brightness;
+
+	return ret;
+}
+
+static ssize_t ili8960_show_brightness(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct lcd_device *ld = to_lcd_device(dev);
+	struct ili8960 *ili8960 = lcd_get_data(ld);
+
+	return sprintf(buf, "%u\n", ili8960->brightness);
+}
+
+static ssize_t ili8960_store_brightness(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct lcd_device *ld = to_lcd_device(dev);
+	struct ili8960 *ili8960 = lcd_get_data(ld);
+	unsigned long brightness;
+	int ret;
+
+	ret = strict_strtoul(buf, 0, &brightness);
+	if (ret)
+		return ret;
+
+	if (brightness > 255)
+		return -EINVAL;
+
+	ili8960_set_brightness(ili8960, brightness);
+
+	return count;
+}
+
+
+static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
+	ili8960_store_brightness);
+
+static struct lcd_ops ili8960_lcd_ops = {
+	.set_power = ili8960_set_power,
+	.get_power = ili8960_get_power,
+	.set_contrast = ili8960_set_contrast,
+	.set_mode = ili8960_set_mode,
+};
+
+static int __devinit ili8960_probe(struct spi_device *spi)
+{
+	int ret;
+	struct ili8960 *ili8960;
+
+	ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
+	if (!ili8960)
+		return -ENOMEM;
+
+	spi->bits_per_word = 8;
+	spi->mode = SPI_MODE_3;
+
+	ret = spi_setup(spi);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to setup spi\n");
+		goto err_free_ili8960;
+	}
+
+	ili8960->spi = spi;
+
+	ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
+						&ili8960_lcd_ops);
+
+	if (IS_ERR(ili8960->lcd)) {
+		ret = PTR_ERR(ili8960->lcd);
+		dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
+		goto err_free_ili8960;
+	}
+
+	ili8960->lcd->props.max_contrast = 255;
+
+	ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
+	if (ret)
+		goto err_unregister_lcd;
+
+	ili8960_programm_power(ili8960->spi, true);
+	ili8960->enabled = true;
+
+	spi_set_drvdata(spi, ili8960);
+
+	ili8960_write_reg(spi, 0x13, 0x01);
+
+	return 0;
+err_unregister_lcd:
+	lcd_device_unregister(ili8960->lcd);
+err_free_ili8960:
+	kfree(ili8960);
+	return ret;
+}
+
+static int __devexit ili8960_remove(struct spi_device *spi)
+{
+	struct ili8960 *ili8960 = spi_get_drvdata(spi);
+
+	device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
+	lcd_device_unregister(ili8960->lcd);
+
+	spi_set_drvdata(spi, NULL);
+	kfree(ili8960);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
+{
+	struct ili8960 *ili8960 = spi_get_drvdata(spi);
+
+	if (ili8960->enabled)
+		ili8960_programm_power(ili8960->spi, false);
+
+	return 0;
+}
+
+static int ili8960_resume(struct spi_device *spi)
+{
+	struct ili8960 *ili8960 = spi_get_drvdata(spi);
+
+	if (ili8960->enabled)
+		ili8960_programm_power(ili8960->spi, true);
+
+	return 0;
+}
+
+#else
+#define ili8960_suspend NULL
+#define ili8960_resume NULL
+#endif
+
+static struct spi_driver ili8960_driver = {
+	.driver = {
+		.name = "ili8960",
+		.owner = THIS_MODULE,
+	},
+	.probe = ili8960_probe,
+	.remove = __devexit_p(ili8960_remove),
+	.suspend = ili8960_suspend,
+	.resume = ili8960_resume,
+};
+
+static int __init ili8960_init(void)
+{
+	return spi_register_driver(&ili8960_driver);
+}
+module_init(ili8960_init);
+
+static void __exit ili8960_exit(void)
+{
+	spi_unregister_driver(&ili8960_driver);
+}
+module_exit(ili8960_exit)
+
+MODULE_AUTHOR("Lars-Peter Clausen");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
+MODULE_ALIAS("spi:ili8960");
