From 8741ead92bc93e66740237e51b88b8690ebcbba3 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen 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 --- 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 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 8d03924..14adcc6 100644 --- 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 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index fcd50b73..1f89974 100644 --- 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 diff --git a/drivers/video/backlight/ili8960.c b/drivers/video/backlight/ili8960.c new file mode 100644 index 0000000..61eb815 --- /dev/null +++ b/drivers/video/backlight/ili8960.c @@ -0,0 +1,262 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen + * 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 +#include +#include +#include + +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"); -- 1.7.10.4