1 From ee3a5c779be4d1d270388203cd1c6a734a0bf4ed Mon Sep 17 00:00:00 2001
2 From: Lars-Peter Clausen <lars@metafoo.de>
3 Date: Sun, 1 Aug 2010 21:19:40 +0200
4 Subject: [PATCH 09/16] Add ili8960 lcd driver
6 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
8 drivers/video/backlight/Kconfig | 7 +
9 drivers/video/backlight/Makefile | 1 +
10 drivers/video/backlight/ili8960.c | 262 +++++++++++++++++++++++++++++++++++++
11 3 files changed, 270 insertions(+)
12 create mode 100644 drivers/video/backlight/ili8960.c
14 --- a/drivers/video/backlight/Kconfig
15 +++ b/drivers/video/backlight/Kconfig
16 @@ -59,6 +59,13 @@ config LCD_LTV350QV
18 The LTV350QV panel is present on all ATSTK1000 boards.
21 + tristate "Ilitek ili8960 LCD driver"
22 + depends on LCD_CLASS_DEVICE && SPI
25 + Driver for the Ilitek ili8960 LCD controller chip.
28 tristate "ILI Technology ILI9221/ILI9222 support"
30 --- a/drivers/video/backlight/Makefile
31 +++ b/drivers/video/backlight/Makefile
32 @@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
33 obj-$(CONFIG_LCD_CORGI) += corgi_lcd.o
34 obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o
35 obj-$(CONFIG_LCD_HX8357) += hx8357.o
36 +obj-$(CONFIG_LCD_ILI8960) += ili8960.o
37 obj-$(CONFIG_LCD_ILI922X) += ili922x.o
38 obj-$(CONFIG_LCD_ILI9320) += ili9320.o
39 obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o
41 +++ b/drivers/video/backlight/ili8960.c
44 + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
45 + * Driver for Ilitek ili8960 LCD
47 + * This program is free software; you can redistribute it and/or modify it
48 + * under the terms of the GNU General Public License as published by the
49 + * Free Software Foundation; either version 2 of the License, or (at your
50 + * option) any later version.
52 + * You should have received a copy of the GNU General Public License along
53 + * with this program; if not, write to the Free Software Foundation, Inc.,
54 + * 675 Mass Ave, Cambridge, MA 02139, USA.
58 +#include <linux/module.h>
59 +#include <linux/spi/spi.h>
60 +#include <linux/lcd.h>
61 +#include <linux/delay.h>
64 + struct spi_device *spi;
65 + struct lcd_device *lcd;
67 + unsigned int brightness;
70 +#define ILI8960_REG_BRIGHTNESS 0x03
71 +#define ILI8960_REG_POWER 0x05
72 +#define ILI8960_REG_CONTRAST 0x0d
74 +static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
78 + buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
81 + return spi_write(spi, buf, sizeof(buf));
84 +static int ili8960_programm_power(struct spi_device *spi, bool enabled)
91 + ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
99 +static int ili8960_set_power(struct lcd_device *lcd, int power)
101 + struct ili8960 *ili8960 = lcd_get_data(lcd);
104 + case FB_BLANK_UNBLANK:
105 + ili8960->enabled = true;
111 + return ili8960_programm_power(ili8960->spi, ili8960->enabled);
114 +static int ili8960_early_set_power(struct lcd_device *lcd, int power)
116 + struct ili8960 *ili8960 = lcd_get_data(lcd);
119 + case FB_BLANK_UNBLANK:
122 + ili8960->enabled = false;
126 + return ili8960_programm_power(ili8960->spi, ili8960->enabled);
129 +static int ili8960_get_power(struct lcd_device *lcd)
131 + struct ili8960 *ili8960 = lcd_get_data(lcd);
132 + return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
135 +static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
137 + struct ili8960 *ili8960 = lcd_get_data(lcd);
139 + return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
142 +static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
144 + if (mode->xres != 320 && mode->yres != 240)
150 +static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
154 + ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
157 + ili8960->brightness = brightness;
162 +static ssize_t ili8960_show_brightness(struct device *dev,
163 + struct device_attribute *attr, char *buf)
165 + struct lcd_device *ld = to_lcd_device(dev);
166 + struct ili8960 *ili8960 = lcd_get_data(ld);
168 + return sprintf(buf, "%u\n", ili8960->brightness);
171 +static ssize_t ili8960_store_brightness(struct device *dev,
172 + struct device_attribute *attr, const char *buf, size_t count)
174 + struct lcd_device *ld = to_lcd_device(dev);
175 + struct ili8960 *ili8960 = lcd_get_data(ld);
176 + unsigned long brightness;
179 + ret = kstrtoul(buf, 0, &brightness);
183 + if (brightness > 255)
186 + ili8960_set_brightness(ili8960, brightness);
192 +static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
193 + ili8960_store_brightness);
195 +static struct lcd_ops ili8960_lcd_ops = {
196 + .set_power = ili8960_set_power,
197 + .early_set_power = ili8960_early_set_power,
198 + .get_power = ili8960_get_power,
199 + .set_contrast = ili8960_set_contrast,
200 + .set_mode = ili8960_set_mode,
203 +static int ili8960_probe(struct spi_device *spi)
206 + struct ili8960 *ili8960;
208 + ili8960 = devm_kzalloc(&spi->dev, sizeof(*ili8960), GFP_KERNEL);
212 + spi->bits_per_word = 8;
213 + spi->mode = SPI_MODE_3;
215 + ret = spi_setup(spi);
217 + dev_err(&spi->dev, "Failed to setup spi\n");
221 + ili8960->spi = spi;
223 + ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
226 + if (IS_ERR(ili8960->lcd)) {
227 + ret = PTR_ERR(ili8960->lcd);
228 + dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
232 + ili8960->lcd->props.max_contrast = 255;
234 + ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
236 + goto err_unregister_lcd;
238 + ili8960_programm_power(ili8960->spi, true);
239 + ili8960->enabled = true;
241 + spi_set_drvdata(spi, ili8960);
243 + ili8960_write_reg(spi, 0x13, 0x01);
247 + lcd_device_unregister(ili8960->lcd);
251 +static int ili8960_remove(struct spi_device *spi)
253 + struct ili8960 *ili8960 = spi_get_drvdata(spi);
255 + device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
256 + lcd_device_unregister(ili8960->lcd);
258 + spi_set_drvdata(spi, NULL);
264 +static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
266 + struct ili8960 *ili8960 = spi_get_drvdata(spi);
268 + if (ili8960->enabled)
269 + ili8960_programm_power(ili8960->spi, false);
274 +static int ili8960_resume(struct spi_device *spi)
276 + struct ili8960 *ili8960 = spi_get_drvdata(spi);
278 + if (ili8960->enabled)
279 + ili8960_programm_power(ili8960->spi, true);
285 +#define ili8960_suspend NULL
286 +#define ili8960_resume NULL
289 +static struct spi_driver ili8960_driver = {
292 + .owner = THIS_MODULE,
294 + .probe = ili8960_probe,
295 + .remove = ili8960_remove,
296 + .suspend = ili8960_suspend,
297 + .resume = ili8960_resume,
299 +module_spi_driver(ili8960_driver);
301 +MODULE_AUTHOR("Lars-Peter Clausen");
302 +MODULE_LICENSE("GPL");
303 +MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
304 +MODULE_ALIAS("spi:ili8960");