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authorIngo Molnar <mingo@elte.hu>2008-10-03 13:28:46 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-03 13:28:46 -0400
commitf68ec0c24755e5cdb779be6240925f2175311d84 (patch)
treea7b7128e61a8456385d82bd1c7ca5f14eecbf2ca /drivers/video/backlight/ili9320.c
parent98920dc3d1113b883cbc73e3293446d3525c6042 (diff)
parent94aca1dac6f6d21f4b07e4864baf7768cabcc6e7 (diff)
Merge commit 'v2.6.27-rc8' into x86/setup
Diffstat (limited to 'drivers/video/backlight/ili9320.c')
-rw-r--r--drivers/video/backlight/ili9320.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/drivers/video/backlight/ili9320.c b/drivers/video/backlight/ili9320.c
new file mode 100644
index 000000000000..ba89b41b639c
--- /dev/null
+++ b/drivers/video/backlight/ili9320.c
@@ -0,0 +1,330 @@
1/* drivers/video/backlight/ili9320.c
2 *
3 * ILI9320 LCD controller driver core.
4 *
5 * Copyright 2007 Simtec Electronics
6 * http://armlinux.simtec.co.uk/
7 * Ben Dooks <ben@simtec.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12*/
13
14#include <linux/delay.h>
15#include <linux/err.h>
16#include <linux/fb.h>
17#include <linux/init.h>
18#include <linux/lcd.h>
19#include <linux/module.h>
20
21#include <linux/spi/spi.h>
22
23#include <video/ili9320.h>
24
25#include "ili9320.h"
26
27
28static inline int ili9320_write_spi(struct ili9320 *ili,
29 unsigned int reg,
30 unsigned int value)
31{
32 struct ili9320_spi *spi = &ili->access.spi;
33 unsigned char *addr = spi->buffer_addr;
34 unsigned char *data = spi->buffer_data;
35
36 /* spi message consits of:
37 * first byte: ID and operation
38 */
39
40 addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
41 addr[1] = reg >> 8;
42 addr[2] = reg;
43
44 /* second message is the data to transfer */
45
46 data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
47 data[1] = value >> 8;
48 data[2] = value;
49
50 return spi_sync(spi->dev, &spi->message);
51}
52
53int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
54{
55 dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
56 return ili->write(ili, reg, value);
57}
58
59EXPORT_SYMBOL_GPL(ili9320_write);
60
61int ili9320_write_regs(struct ili9320 *ili,
62 struct ili9320_reg *values,
63 int nr_values)
64{
65 int index;
66 int ret;
67
68 for (index = 0; index < nr_values; index++, values++) {
69 ret = ili9320_write(ili, values->address, values->value);
70 if (ret != 0)
71 return ret;
72 }
73
74 return 0;
75}
76
77EXPORT_SYMBOL_GPL(ili9320_write_regs);
78
79static void ili9320_reset(struct ili9320 *lcd)
80{
81 struct ili9320_platdata *cfg = lcd->platdata;
82
83 cfg->reset(1);
84 mdelay(50);
85
86 cfg->reset(0);
87 mdelay(50);
88
89 cfg->reset(1);
90 mdelay(100);
91}
92
93static inline int ili9320_init_chip(struct ili9320 *lcd)
94{
95 int ret;
96
97 ili9320_reset(lcd);
98
99 ret = lcd->client->init(lcd, lcd->platdata);
100 if (ret != 0) {
101 dev_err(lcd->dev, "failed to initialise display\n");
102 return ret;
103 }
104
105 lcd->initialised = 1;
106 return 0;
107}
108
109static inline int ili9320_power_on(struct ili9320 *lcd)
110{
111 if (!lcd->initialised)
112 ili9320_init_chip(lcd);
113
114 lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
115 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
116
117 return 0;
118}
119
120static inline int ili9320_power_off(struct ili9320 *lcd)
121{
122 lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
123 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
124
125 return 0;
126}
127
128#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
129
130static int ili9320_power(struct ili9320 *lcd, int power)
131{
132 int ret = 0;
133
134 dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
135
136 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
137 ret = ili9320_power_on(lcd);
138 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
139 ret = ili9320_power_off(lcd);
140
141 if (ret == 0)
142 lcd->power = power;
143 else
144 dev_warn(lcd->dev, "failed to set power mode %d\n", power);
145
146 return ret;
147}
148
149static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
150{
151 return lcd_get_data(lcd);
152}
153
154static int ili9320_set_power(struct lcd_device *ld, int power)
155{
156 struct ili9320 *lcd = to_our_lcd(ld);
157
158 return ili9320_power(lcd, power);
159}
160
161static int ili9320_get_power(struct lcd_device *ld)
162{
163 struct ili9320 *lcd = to_our_lcd(ld);
164
165 return lcd->power;
166}
167
168static struct lcd_ops ili9320_ops = {
169 .get_power = ili9320_get_power,
170 .set_power = ili9320_set_power,
171};
172
173static void __devinit ili9320_setup_spi(struct ili9320 *ili,
174 struct spi_device *dev)
175{
176 struct ili9320_spi *spi = &ili->access.spi;
177
178 ili->write = ili9320_write_spi;
179 spi->dev = dev;
180
181 /* fill the two messages we are going to use to send the data
182 * with, the first the address followed by the data. The datasheet
183 * says they should be done as two distinct cycles of the SPI CS line.
184 */
185
186 spi->xfer[0].tx_buf = spi->buffer_addr;
187 spi->xfer[1].tx_buf = spi->buffer_data;
188 spi->xfer[0].len = 3;
189 spi->xfer[1].len = 3;
190 spi->xfer[0].bits_per_word = 8;
191 spi->xfer[1].bits_per_word = 8;
192 spi->xfer[0].cs_change = 1;
193
194 spi_message_init(&spi->message);
195 spi_message_add_tail(&spi->xfer[0], &spi->message);
196 spi_message_add_tail(&spi->xfer[1], &spi->message);
197}
198
199int __devinit ili9320_probe_spi(struct spi_device *spi,
200 struct ili9320_client *client)
201{
202 struct ili9320_platdata *cfg = spi->dev.platform_data;
203 struct device *dev = &spi->dev;
204 struct ili9320 *ili;
205 struct lcd_device *lcd;
206 int ret = 0;
207
208 /* verify we where given some information */
209
210 if (cfg == NULL) {
211 dev_err(dev, "no platform data supplied\n");
212 return -EINVAL;
213 }
214
215 if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
216 dev_err(dev, "invalid platform data supplied\n");
217 return -EINVAL;
218 }
219
220 /* allocate and initialse our state */
221
222 ili = kzalloc(sizeof(struct ili9320), GFP_KERNEL);
223 if (ili == NULL) {
224 dev_err(dev, "no memory for device\n");
225 return -ENOMEM;
226 }
227
228 ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
229
230 ili->dev = dev;
231 ili->client = client;
232 ili->power = FB_BLANK_POWERDOWN;
233 ili->platdata = cfg;
234
235 dev_set_drvdata(&spi->dev, ili);
236
237 ili9320_setup_spi(ili, spi);
238
239 lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
240 if (IS_ERR(lcd)) {
241 dev_err(dev, "failed to register lcd device\n");
242 ret = PTR_ERR(lcd);
243 goto err_free;
244 }
245
246 ili->lcd = lcd;
247
248 dev_info(dev, "initialising %s\n", client->name);
249
250 ret = ili9320_power(ili, FB_BLANK_UNBLANK);
251 if (ret != 0) {
252 dev_err(dev, "failed to set lcd power state\n");
253 goto err_unregister;
254 }
255
256 return 0;
257
258 err_unregister:
259 lcd_device_unregister(lcd);
260
261 err_free:
262 kfree(ili);
263
264 return ret;
265}
266
267EXPORT_SYMBOL_GPL(ili9320_probe_spi);
268
269int __devexit ili9320_remove(struct ili9320 *ili)
270{
271 ili9320_power(ili, FB_BLANK_POWERDOWN);
272
273 lcd_device_unregister(ili->lcd);
274 kfree(ili);
275
276 return 0;
277}
278
279EXPORT_SYMBOL_GPL(ili9320_remove);
280
281#ifdef CONFIG_PM
282int ili9320_suspend(struct ili9320 *lcd, pm_message_t state)
283{
284 int ret;
285
286 dev_dbg(lcd->dev, "%s: event %d\n", __func__, state.event);
287
288 if (state.event == PM_EVENT_SUSPEND) {
289 ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
290
291 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
292 ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
293 ILI9320_POWER1_SLP |
294 ILI9320_POWER1_DSTB);
295 lcd->initialised = 0;
296 }
297
298 return ret;
299 }
300
301 return 0;
302}
303
304EXPORT_SYMBOL_GPL(ili9320_suspend);
305
306int ili9320_resume(struct ili9320 *lcd)
307{
308 dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
309
310 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
311 ili9320_write(lcd, ILI9320_POWER1, 0x00);
312 }
313
314 return ili9320_power(lcd, FB_BLANK_UNBLANK);
315}
316
317EXPORT_SYMBOL_GPL(ili9320_resume);
318#endif
319
320/* Power down all displays on reboot, poweroff or halt */
321void ili9320_shutdown(struct ili9320 *lcd)
322{
323 ili9320_power(lcd, FB_BLANK_POWERDOWN);
324}
325
326EXPORT_SYMBOL_GPL(ili9320_shutdown);
327
328MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
329MODULE_DESCRIPTION("ILI9320 LCD Driver");
330MODULE_LICENSE("GPL v2");