Root/target/linux/xburst/patches-3.0/0012-Add-ili8960-lcd-driver.patch

1From d7a92f8ccdca40672a2a242c756fb52c31b2bdba 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 12/32] 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
13diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
14index 2d93c8d..2fad528 100644
15--- a/drivers/video/backlight/Kconfig
16+++ b/drivers/video/backlight/Kconfig
17@@ -59,6 +59,13 @@ config LCD_LTV350QV
18 
19       The LTV350QV panel is present on all ATSTK1000 boards.
20 
21+config LCD_ILI8960
22+ tristate "Ilitek ili8960 LCD driver"
23+ depends on LCD_CLASS_DEVICE && SPI
24+ default n
25+ help
26+ Driver for the Ilitek ili8960 LCD controller chip.
27+
28 config LCD_ILI9320
29     tristate
30     help
31diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
32index ee72adb..c7af746 100644
33--- a/drivers/video/backlight/Makefile
34+++ b/drivers/video/backlight/Makefile
35@@ -6,6 +6,7 @@ obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o
36 obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o
37 obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o
38 obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
39+obj-$(CONFIG_LCD_ILI8960) += ili8960.o
40 obj-$(CONFIG_LCD_ILI9320) += ili9320.o
41 obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
42 obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
43diff --git a/drivers/video/backlight/ili8960.c b/drivers/video/backlight/ili8960.c
44new file mode 100644
45index 0000000..1438e92
46--- /dev/null
47+++ b/drivers/video/backlight/ili8960.c
48@@ -0,0 +1,263 @@
49+/*
50+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
51+ * Driver for Ilitek ili8960 LCD
52+ *
53+ * This program is free software; you can redistribute it and/or modify it
54+ * under the terms of the GNU General Public License as published by the
55+ * Free Software Foundation; either version 2 of the License, or (at your
56+ * option) any later version.
57+ *
58+ * You should have received a copy of the GNU General Public License along
59+ * with this program; if not, write to the Free Software Foundation, Inc.,
60+ * 675 Mass Ave, Cambridge, MA 02139, USA.
61+ *
62+ */
63+
64+#include <linux/module.h>
65+#include <linux/spi/spi.h>
66+#include <linux/lcd.h>
67+#include <linux/backlight.h>
68+#include <linux/delay.h>
69+
70+struct ili8960 {
71+ struct spi_device *spi;
72+ struct lcd_device *lcd;
73+ struct backlight_device *bl;
74+ bool enabled;
75+ unsigned int brightness;
76+};
77+
78+#define ILI8960_REG_BRIGHTNESS 0x03
79+#define ILI8960_REG_POWER 0x05
80+#define ILI8960_REG_CONTRAST 0x0d
81+
82+static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
83+ uint8_t data)
84+{
85+ uint8_t buf[2];
86+ buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
87+ buf[1] = data;
88+
89+ return spi_write(spi, buf, sizeof(buf));
90+}
91+
92+static int ili8960_programm_power(struct spi_device *spi, bool enabled)
93+{
94+ int ret;
95+
96+ if (enabled)
97+ mdelay(20);
98+
99+ ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
100+
101+ if (!enabled)
102+ mdelay(20);
103+
104+ return ret;
105+}
106+
107+static int ili8960_set_power(struct lcd_device *lcd, int power)
108+{
109+ struct ili8960 *ili8960 = lcd_get_data(lcd);
110+
111+ switch (power) {
112+ case FB_BLANK_UNBLANK:
113+ ili8960->enabled = true;
114+ break;
115+ default:
116+ ili8960->enabled = false;
117+ break;
118+ }
119+
120+ return ili8960_programm_power(ili8960->spi, ili8960->enabled);
121+}
122+
123+static int ili8960_get_power(struct lcd_device *lcd)
124+{
125+ struct ili8960 *ili8960 = lcd_get_data(lcd);
126+ return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
127+}
128+
129+static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
130+{
131+ struct ili8960 *ili8960 = lcd_get_data(lcd);
132+
133+ return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
134+}
135+
136+static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
137+{
138+ if (mode->xres != 320 && mode->yres != 240)
139+ return -EINVAL;
140+
141+ return 0;
142+}
143+
144+static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
145+{
146+ int ret;
147+
148+ ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
149+
150+ if (ret == 0)
151+ ili8960->brightness = brightness;
152+
153+ return ret;
154+}
155+
156+static ssize_t ili8960_show_brightness(struct device *dev,
157+ struct device_attribute *attr, char *buf)
158+{
159+ struct lcd_device *ld = to_lcd_device(dev);
160+ struct ili8960 *ili8960 = lcd_get_data(ld);
161+
162+ return sprintf(buf, "%u\n", ili8960->brightness);
163+}
164+
165+static ssize_t ili8960_store_brightness(struct device *dev,
166+ struct device_attribute *attr, const char *buf, size_t count)
167+{
168+ struct lcd_device *ld = to_lcd_device(dev);
169+ struct ili8960 *ili8960 = lcd_get_data(ld);
170+ unsigned long brightness;
171+ int ret;
172+
173+ ret = strict_strtoul(buf, 0, &brightness);
174+ if (ret)
175+ return ret;
176+
177+ if (brightness > 255)
178+ return -EINVAL;
179+
180+ ili8960_set_brightness(ili8960, brightness);
181+
182+ return count;
183+}
184+
185+
186+static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
187+ ili8960_store_brightness);
188+
189+static struct lcd_ops ili8960_lcd_ops = {
190+ .set_power = ili8960_set_power,
191+ .get_power = ili8960_get_power,
192+ .set_contrast = ili8960_set_contrast,
193+ .set_mode = ili8960_set_mode,
194+};
195+
196+static int __devinit ili8960_probe(struct spi_device *spi)
197+{
198+ int ret;
199+ struct ili8960 *ili8960;
200+
201+ ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
202+ if (!ili8960)
203+ return -ENOMEM;
204+
205+ spi->bits_per_word = 8;
206+ spi->mode = SPI_MODE_3;
207+
208+ ret = spi_setup(spi);
209+ if (ret) {
210+ dev_err(&spi->dev, "Failed to setup spi\n");
211+ goto err_free_ili8960;
212+ }
213+
214+ ili8960->spi = spi;
215+
216+ ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
217+ &ili8960_lcd_ops);
218+
219+ if (IS_ERR(ili8960->lcd)) {
220+ ret = PTR_ERR(ili8960->lcd);
221+ dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
222+ goto err_free_ili8960;
223+ }
224+
225+ ili8960->lcd->props.max_contrast = 255;
226+
227+ ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
228+ if (ret)
229+ goto err_unregister_lcd;
230+
231+ ili8960_programm_power(ili8960->spi, true);
232+ ili8960->enabled = true;
233+
234+ spi_set_drvdata(spi, ili8960);
235+
236+ ili8960_write_reg(spi, 0x13, 0x01);
237+
238+ return 0;
239+err_unregister_lcd:
240+ lcd_device_unregister(ili8960->lcd);
241+err_free_ili8960:
242+ kfree(ili8960);
243+ return ret;
244+}
245+
246+static int __devexit ili8960_remove(struct spi_device *spi)
247+{
248+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
249+
250+ device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
251+ lcd_device_unregister(ili8960->lcd);
252+
253+ spi_set_drvdata(spi, NULL);
254+ kfree(ili8960);
255+ return 0;
256+}
257+
258+#ifdef CONFIG_PM
259+
260+static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
261+{
262+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
263+
264+ if (ili8960->enabled)
265+ ili8960_programm_power(ili8960->spi, false);
266+
267+ return 0;
268+}
269+
270+static int ili8960_resume(struct spi_device *spi)
271+{
272+ struct ili8960 *ili8960 = spi_get_drvdata(spi);
273+
274+ if (ili8960->enabled)
275+ ili8960_programm_power(ili8960->spi, true);
276+
277+ return 0;
278+}
279+
280+#else
281+#define ili8960_suspend NULL
282+#define ili8960_resume NULL
283+#endif
284+
285+static struct spi_driver ili8960_driver = {
286+ .driver = {
287+ .name = "ili8960",
288+ .owner = THIS_MODULE,
289+ },
290+ .probe = ili8960_probe,
291+ .remove = __devexit_p(ili8960_remove),
292+ .suspend = ili8960_suspend,
293+ .resume = ili8960_resume,
294+};
295+
296+static int __init ili8960_init(void)
297+{
298+ return spi_register_driver(&ili8960_driver);
299+}
300+module_init(ili8960_init);
301+
302+static void __exit ili8960_exit(void)
303+{
304+ spi_unregister_driver(&ili8960_driver);
305+}
306+module_exit(ili8960_exit)
307+
308+MODULE_AUTHOR("Lars-Peter Clausen");
309+MODULE_LICENSE("GPL");
310+MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
311+MODULE_ALIAS("spi:ili8960");
312--
3131.7.4.1
314
315

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