Date:2010-08-01 21:19:40 (4 years 1 month ago)
Author:Lars C.
Commit:85061058491114869860964b73e2ae0aacce446e
Message:Add ili8960 lcd driver

Files: drivers/video/backlight/Kconfig (1 diff)
drivers/video/backlight/Makefile (1 diff)
drivers/video/backlight/ili8960.c (1 diff)

Change Details

drivers/video/backlight/Kconfig
5959
6060      The LTV350QV panel is present on all ATSTK1000 boards.
6161
62config LCD_ILI8960
63    tristate "Ilitek ili8960 LCD driver"
64    depends on LCD_CLASS_DEVICE && SPI
65    default n
66    help
67      Driver for the Ilitek ili8960 LCD controller chip.
68
6269config LCD_ILI9320
6370    tristate
6471    help
drivers/video/backlight/Makefile
66obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o
77obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o
88obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
9obj-$(CONFIG_LCD_ILI8960) += ili8960.o
910obj-$(CONFIG_LCD_ILI9320) += ili9320.o
1011obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
1112obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
drivers/video/backlight/ili8960.c
1/*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * Driver for Ilitek ili8960 LCD
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/spi/spi.h>
18#include <linux/lcd.h>
19#include <linux/backlight.h>
20#include <linux/delay.h>
21
22struct ili8960 {
23    struct spi_device *spi;
24    struct lcd_device *lcd;
25    struct backlight_device *bl;
26    bool enabled;
27    unsigned int brightness;
28};
29
30#define ILI8960_REG_BRIGHTNESS 0x03
31#define ILI8960_REG_POWER 0x05
32#define ILI8960_REG_CONTRAST 0x0d
33
34static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
35                uint8_t data)
36{
37    uint8_t buf[2];
38    buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
39    buf[1] = data;
40
41    return spi_write(spi, buf, sizeof(buf));
42}
43
44static int ili8960_programm_power(struct spi_device *spi, bool enabled)
45{
46    int ret;
47
48    if (enabled)
49        mdelay(20);
50
51    ret = ili8960_write_reg(spi, ILI8960_REG_POWER, enabled ? 0xc7 : 0xc6);
52
53    if (!enabled)
54        mdelay(20);
55
56    return ret;
57}
58
59static int ili8960_set_power(struct lcd_device *lcd, int power)
60{
61    struct ili8960 *ili8960 = lcd_get_data(lcd);
62
63    switch (power) {
64    case FB_BLANK_UNBLANK:
65        ili8960->enabled = true;
66        break;
67    default:
68        ili8960->enabled = false;
69        break;
70    }
71
72    return ili8960_programm_power(ili8960->spi, ili8960->enabled);
73}
74
75static int ili8960_get_power(struct lcd_device *lcd)
76{
77    struct ili8960 *ili8960 = lcd_get_data(lcd);
78    return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
79}
80
81static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
82{
83    struct ili8960 *ili8960 = lcd_get_data(lcd);
84
85    return ili8960_write_reg(ili8960->spi, ILI8960_REG_CONTRAST, contrast);
86}
87
88static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
89{
90    if (mode->xres != 320 && mode->yres != 240)
91        return -EINVAL;
92
93    return 0;
94}
95
96static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
97{
98    int ret;
99
100    ret = ili8960_write_reg(ili8960->spi, ILI8960_REG_BRIGHTNESS, brightness);
101
102    if (ret == 0)
103        ili8960->brightness = brightness;
104
105    return ret;
106}
107
108static ssize_t ili8960_show_brightness(struct device *dev,
109        struct device_attribute *attr, char *buf)
110{
111    struct lcd_device *ld = to_lcd_device(dev);
112    struct ili8960 *ili8960 = lcd_get_data(ld);
113
114    return sprintf(buf, "%u\n", ili8960->brightness);
115}
116
117static ssize_t ili8960_store_brightness(struct device *dev,
118        struct device_attribute *attr, const char *buf, size_t count)
119{
120    struct lcd_device *ld = to_lcd_device(dev);
121    struct ili8960 *ili8960 = lcd_get_data(ld);
122    unsigned long brightness;
123    int ret;
124
125    ret = strict_strtoul(buf, 0, &brightness);
126    if (ret)
127        return ret;
128
129    if (brightness > 255)
130        return -EINVAL;
131
132    ili8960_set_brightness(ili8960, brightness);
133
134    return count;
135}
136
137
138static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
139    ili8960_store_brightness);
140
141static struct lcd_ops ili8960_lcd_ops = {
142    .set_power = ili8960_set_power,
143    .get_power = ili8960_get_power,
144    .set_contrast = ili8960_set_contrast,
145    .set_mode = ili8960_set_mode,
146};
147
148static int __devinit ili8960_probe(struct spi_device *spi)
149{
150    int ret;
151    struct ili8960 *ili8960;
152
153    ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
154    if (!ili8960)
155        return -ENOMEM;
156
157    spi->bits_per_word = 8;
158    spi->mode = SPI_MODE_3;
159
160    ret = spi_setup(spi);
161    if (ret) {
162        dev_err(&spi->dev, "Failed to setup spi\n");
163        goto err_free_ili8960;
164    }
165
166    ili8960->spi = spi;
167
168    ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
169                        &ili8960_lcd_ops);
170
171    if (IS_ERR(ili8960->lcd)) {
172        ret = PTR_ERR(ili8960->lcd);
173        dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
174        goto err_free_ili8960;
175    }
176
177    ili8960->lcd->props.max_contrast = 255;
178
179    ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
180    if (ret)
181        goto err_unregister_lcd;
182
183    ili8960_programm_power(ili8960->spi, true);
184    ili8960->enabled = true;
185
186    spi_set_drvdata(spi, ili8960);
187
188    ili8960_write_reg(spi, 0x13, 0x01);
189
190    return 0;
191err_unregister_lcd:
192    lcd_device_unregister(ili8960->lcd);
193err_free_ili8960:
194    kfree(ili8960);
195    return ret;
196}
197
198static int __devexit ili8960_remove(struct spi_device *spi)
199{
200    struct ili8960 *ili8960 = spi_get_drvdata(spi);
201
202    device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
203    lcd_device_unregister(ili8960->lcd);
204
205    spi_set_drvdata(spi, NULL);
206    kfree(ili8960);
207    return 0;
208}
209
210#ifdef CONFIG_PM
211
212static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
213{
214    struct ili8960 *ili8960 = spi_get_drvdata(spi);
215
216    if (ili8960->enabled)
217        ili8960_programm_power(ili8960->spi, false);
218
219    return 0;
220}
221
222static int ili8960_resume(struct spi_device *spi)
223{
224    struct ili8960 *ili8960 = spi_get_drvdata(spi);
225
226    if (ili8960->enabled)
227        ili8960_programm_power(ili8960->spi, true);
228
229    return 0;
230}
231
232#else
233#define ili8960_suspend NULL
234#define ili8960_resume NULL
235#endif
236
237static struct spi_driver ili8960_driver = {
238    .driver = {
239        .name = "ili8960",
240        .owner = THIS_MODULE,
241    },
242    .probe = ili8960_probe,
243    .remove = __devexit_p(ili8960_remove),
244    .suspend = ili8960_suspend,
245    .resume = ili8960_resume,
246};
247
248static int __init ili8960_init(void)
249{
250    return spi_register_driver(&ili8960_driver);
251}
252module_init(ili8960_init);
253
254static void __exit ili8960_exit(void)
255{
256    spi_unregister_driver(&ili8960_driver);
257}
258module_exit(ili8960_exit)
259
260MODULE_AUTHOR("Lars-Peter Clausen");
261MODULE_LICENSE("GPL");
262MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
263MODULE_ALIAS("spi:ili8960");

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