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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 | ||
28 | static 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 | ||
53 | int 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 | ||
59 | EXPORT_SYMBOL_GPL(ili9320_write); | |
60 | ||
61 | int 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 | ||
77 | EXPORT_SYMBOL_GPL(ili9320_write_regs); | |
78 | ||
79 | static 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 | ||
93 | static 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 | ||
109 | static 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 | ||
120 | static 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 | ||
130 | static 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 | ||
149 | static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd) | |
150 | { | |
151 | return lcd_get_data(lcd); | |
152 | } | |
153 | ||
154 | static 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 | ||
161 | static int ili9320_get_power(struct lcd_device *ld) | |
162 | { | |
163 | struct ili9320 *lcd = to_our_lcd(ld); | |
164 | ||
165 | return lcd->power; | |
166 | } | |
167 | ||
168 | static struct lcd_ops ili9320_ops = { | |
169 | .get_power = ili9320_get_power, | |
170 | .set_power = ili9320_set_power, | |
171 | }; | |
172 | ||
173 | static 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 | ||
199 | int __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 | ||
267 | EXPORT_SYMBOL_GPL(ili9320_probe_spi); | |
268 | ||
269 | int __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 | ||
279 | EXPORT_SYMBOL_GPL(ili9320_remove); | |
280 | ||
281 | #ifdef CONFIG_PM | |
282 | int 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 | ||
304 | EXPORT_SYMBOL_GPL(ili9320_suspend); | |
305 | ||
306 | int 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 | ||
317 | EXPORT_SYMBOL_GPL(ili9320_resume); | |
318 | #endif | |
319 | ||
320 | /* Power down all displays on reboot, poweroff or halt */ | |
321 | void ili9320_shutdown(struct ili9320 *lcd) | |
322 | { | |
323 | ili9320_power(lcd, FB_BLANK_POWERDOWN); | |
324 | } | |
325 | ||
326 | EXPORT_SYMBOL_GPL(ili9320_shutdown); | |
327 | ||
328 | MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>"); | |
329 | MODULE_DESCRIPTION("ILI9320 LCD Driver"); | |
330 | MODULE_LICENSE("GPL v2"); |