Root/target/linux/xburst/patches-2.6.37/100-lcm.patch

1From 85061058491114869860964b73e2ae0aacce446e Mon Sep 17 00:00:00 2001
2From: Lars-Peter Clausen <lars@metafoo.de>
3Date: Sun, 1 Aug 2010 21:19:40 +0200
4Subject: [PATCH 03/23] Add ili8960 lcd driver
5
6---
7 drivers/video/backlight/Kconfig | 7 +
8 drivers/video/backlight/Makefile | 1 +
9 drivers/video/backlight/ili8960.c | 263 +++++++++++++++++++++++++++++++++++++
10 3 files changed, 271 insertions(+), 0 deletions(-)
11 create mode 100644 drivers/video/backlight/ili8960.c
12
13--- a/drivers/video/backlight/Kconfig
14+++ b/drivers/video/backlight/Kconfig
15@@ -59,6 +59,13 @@ config LCD_LTV350QV
16 
17       The LTV350QV panel is present on all ATSTK1000 boards.
18 
19+config LCD_ILI8960
20+ tristate "Ilitek ili8960 LCD driver"
21+ depends on LCD_CLASS_DEVICE && SPI
22+ default n
23+ help
24+ Driver for the Ilitek ili8960 LCD controller chip.
25+
26 config LCD_ILI9320
27     tristate
28     help
29--- a/drivers/video/backlight/Makefile
30+++ b/drivers/video/backlight/Makefile
31@@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700) += jornada72
32 obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o
33 obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o
34 obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
35+obj-$(CONFIG_LCD_ILI8960) += ili8960.o
36 obj-$(CONFIG_LCD_ILI9320) += ili9320.o
37 obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
38 obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
39--- /dev/null
40+++ b/drivers/video/backlight/ili8960.c
41@@ -0,0 +1,263 @@
42+/*
43+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
44+ * Driver for Ilitek ili8960 LCD
45+ *
46+ * This program is free software; you can redistribute it and/or modify it
47+ * under the terms of the GNU General Public License as published by the
48+ * Free Software Foundation; either version 2 of the License, or (at your
49+ * option) any later version.
50+ *
51+ * You should have received a copy of the GNU General Public License along
52+ * with this program; if not, write to the Free Software Foundation, Inc.,
53+ * 675 Mass Ave, Cambridge, MA 02139, USA.
54+ *
55+ */
56+
57+#include <linux/module.h>
58+#include <linux/spi/spi.h>
59+#include <linux/lcd.h>
60+#include <linux/backlight.h>
61+#include <linux/delay.h>
62+
63+struct ili8960 {
64+ struct spi_device *spi;
65+ struct lcd_device *lcd;
66+ struct backlight_device *bl;
67+ bool enabled;
68+ unsigned int brightness;
69+};
70+
71+#define ILI8960_REG_BRIGHTNESS 0x03
72+#define ILI8960_REG_POWER 0x05
73+#define ILI8960_REG_CONTRAST 0x0d
74+
75+static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
76+ uint8_t data)
77+{
78+ uint8_t buf[2];
79+ buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
80+ buf[1] = data;
81+
82+ return spi_write(spi, buf, sizeof(buf));
83+}
84+
85+static int ili8960_programm_power(struct spi_device *spi, bool enabled)
86+{
87+ int ret;
88+
89+ if (enabled)
90+ mdelay(20);
91+
92+ ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
93+
94+ if (!enabled)
95+ mdelay(20);
96+
97+ return ret;
98+}
99+
100+static int ili8960_set_power(struct lcd_device *lcd, int power)
101+{
102+ struct ili8960 *ili8960 = lcd_get_data(lcd);
103+
104+ switch (power) {
105+ case FB_BLANK_UNBLANK:
106+ ili8960->enabled = true;
107+ break;
108+ default:
109+ ili8960->enabled = false;
110+ break;
111+ }
112+
113+ return ili8960_programm_power(ili8960->spi, ili8960->enabled);
114+}
115+
116+static int ili8960_get_power(struct lcd_device *lcd)
117+{
118+ struct ili8960 *ili8960 = lcd_get_data(lcd);
119+ return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
120+}
121+
122+static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
123+{
124+ struct ili8960 *ili8960 = lcd_get_data(lcd);
125+
126+ return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
127+}
128+
129+static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
130+{
131+ if (mode->xres != 320 && mode->yres != 240)
132+ return -EINVAL;
133+
134+ return 0;
135+}
136+
137+static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
138+{
139+ int ret;
140+
141+ ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
142+
143+ if (ret == 0)
144+ ili8960->brightness = brightness;
145+
146+ return ret;
147+}
148+
149+static ssize_t ili8960_show_brightness(struct device *dev,
150+ struct device_attribute *attr, char *buf)
151+{
152+ struct lcd_device *ld = to_lcd_device(dev);
153+ struct ili8960 *ili8960 = lcd_get_data(ld);
154+
155+ return sprintf(buf, "%u\n", ili8960->brightness);
156+}
157+
158+static ssize_t ili8960_store_brightness(struct device *dev,
159+ struct device_attribute *attr, const char *buf, size_t count)
160+{
161+ struct lcd_device *ld = to_lcd_device(dev);
162+ struct ili8960 *ili8960 = lcd_get_data(ld);
163+ unsigned long brightness;
164+ int ret;
165+
166+ ret = strict_strtoul(buf, 0, &brightness);
167+ if (ret)
168+ return ret;
169+
170+ if (brightness > 255)
171+ return -EINVAL;
172+
173+ ili8960_set_brightness(ili8960, brightness);
174+
175+ return count;
176+}
177+
178+
179+static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
180+ ili8960_store_brightness);
181+
182+static struct lcd_ops ili8960_lcd_ops = {
183+ .set_power = ili8960_set_power,
184+ .get_power = ili8960_get_power,
185+ .set_contrast = ili8960_set_contrast,
186+ .set_mode = ili8960_set_mode,
187+};
188+
189+static int __devinit ili8960_probe(struct spi_device *spi)
190+{
191+ int ret;
192+ struct ili8960 *ili8960;
193+
194+ ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
195+ if (!ili8960)
196+ return -ENOMEM;
197+
198+ spi->bits_per_word = 8;
199+ spi->mode = SPI_MODE_3;
200+
201+ ret = spi_setup(spi);
202+ if (ret) {
203+ dev_err(&spi->dev, "Failed to setup spi\n");
204+ goto err_free_ili8960;
205+ }
206+
207+ ili8960->spi = spi;
208+
209+ ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
210+ &ili8960_lcd_ops);
211+
212+ if (IS_ERR(ili8960->lcd)) {
213+ ret = PTR_ERR(ili8960->lcd);
214+ dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
215+ goto err_free_ili8960;
216+ }
217+
218+ ili8960->lcd->props.max_contrast = 255;
219+
220+ ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
221+ if (ret)
222+ goto err_unregister_lcd;
223+
224+ ili8960_programm_power(ili8960->spi, true);
225+ ili8960->enabled = true;
226+
227+ spi_set_drvdata(spi, ili8960);
228+
229+ ili8960_write_reg(spi, 0x13, 0x01);
230+
231+ return 0;
232+err_unregister_lcd:
233+ lcd_device_unregister(ili8960->lcd);
234+err_free_ili8960:
235+ kfree(ili8960);
236+ return ret;
237+}
238+
239+static int __devexit ili8960_remove(struct spi_device *spi)
240+{
241+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
242+
243+ device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
244+ lcd_device_unregister(ili8960->lcd);
245+
246+ spi_set_drvdata(spi, NULL);
247+ kfree(ili8960);
248+ return 0;
249+}
250+
251+#ifdef CONFIG_PM
252+
253+static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
254+{
255+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
256+
257+ if (ili8960->enabled)
258+ ili8960_programm_power(ili8960->spi, false);
259+
260+ return 0;
261+}
262+
263+static int ili8960_resume(struct spi_device *spi)
264+{
265+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
266+
267+ if (ili8960->enabled)
268+ ili8960_programm_power(ili8960->spi, true);
269+
270+ return 0;
271+}
272+
273+#else
274+#define ili8960_suspend NULL
275+#define ili8960_resume NULL
276+#endif
277+
278+static struct spi_driver ili8960_driver = {
279+ .driver = {
280+ .name = "ili8960",
281+ .owner = THIS_MODULE,
282+ },
283+ .probe = ili8960_probe,
284+ .remove = __devexit_p(ili8960_remove),
285+ .suspend = ili8960_suspend,
286+ .resume = ili8960_resume,
287+};
288+
289+static int __init ili8960_init(void)
290+{
291+ return spi_register_driver(&ili8960_driver);
292+}
293+module_init(ili8960_init);
294+
295+static void __exit ili8960_exit(void)
296+{
297+ spi_unregister_driver(&ili8960_driver);
298+}
299+module_exit(ili8960_exit)
300+
301+MODULE_AUTHOR("Lars-Peter Clausen");
302+MODULE_LICENSE("GPL");
303+MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
304+MODULE_ALIAS("spi:ili8960");
305

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