OpenWrt – Rev 1
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From 8741ead92bc93e66740237e51b88b8690ebcbba3 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 6/7] Add ili8960 lcd driver
Includes the following changes from the jz-3.5 branch:
- Use module_spi_driver
- Use devm_kzalloc
- Use kstrtoul
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/ili8960.c | 262 +++++++++++++++++++++++++++++++++++++
3 files changed, 270 insertions(+)
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_ILI922X
tristate "ILI Technology ILI9221/ILI9222 support"
depends on SPI
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
obj-$(CONFIG_LCD_CORGI) += corgi_lcd.o
obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o
obj-$(CONFIG_LCD_HX8357) += hx8357.o
+obj-$(CONFIG_LCD_ILI8960) += ili8960.o
obj-$(CONFIG_LCD_ILI922X) += ili922x.o
obj-$(CONFIG_LCD_ILI9320) += ili9320.o
obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o
--- /dev/null
+++ b/drivers/video/backlight/ili8960.c
@@ -0,0 +1,262 @@
+/*
+ * 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/delay.h>
+
+struct ili8960 {
+ struct spi_device *spi;
+ struct lcd_device *lcd;
+ 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:
+ return 0;
+ }
+
+ return ili8960_programm_power(ili8960->spi, ili8960->enabled);
+}
+
+static int ili8960_early_set_power(struct lcd_device *lcd, int power)
+{
+ struct ili8960 *ili8960 = lcd_get_data(lcd);
+
+ switch (power) {
+ case FB_BLANK_UNBLANK:
+ return 0;
+ 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 = kstrtoul(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,
+ .early_set_power = ili8960_early_set_power,
+ .get_power = ili8960_get_power,
+ .set_contrast = ili8960_set_contrast,
+ .set_mode = ili8960_set_mode,
+};
+
+static int ili8960_probe(struct spi_device *spi)
+{
+ int ret;
+ struct ili8960 *ili8960;
+
+ ili8960 = devm_kzalloc(&spi->dev, 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");
+ return ret;
+ }
+
+ 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);
+ return ret;
+ }
+
+ 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);
+ return ret;
+}
+
+static int 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);
+ 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 = ili8960_remove,
+ .suspend = ili8960_suspend,
+ .resume = ili8960_resume,
+};
+module_spi_driver(ili8960_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
+MODULE_ALIAS("spi:ili8960");
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