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Ben Dookscccb6d32008-07-23 21:31:37 -07001/* 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Ben Dookscccb6d32008-07-23 21:31:37 -070021
22#include <linux/spi/spi.h>
23
24#include <video/ili9320.h>
25
26#include "ili9320.h"
27
28
29static inline int ili9320_write_spi(struct ili9320 *ili,
30 unsigned int reg,
31 unsigned int value)
32{
33 struct ili9320_spi *spi = &ili->access.spi;
34 unsigned char *addr = spi->buffer_addr;
35 unsigned char *data = spi->buffer_data;
36
37 /* spi message consits of:
38 * first byte: ID and operation
39 */
40
41 addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
42 addr[1] = reg >> 8;
43 addr[2] = reg;
44
45 /* second message is the data to transfer */
46
47 data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
Jingoo Hanc0b6cc42012-12-17 16:00:19 -080048 data[1] = value >> 8;
Ben Dookscccb6d32008-07-23 21:31:37 -070049 data[2] = value;
50
51 return spi_sync(spi->dev, &spi->message);
52}
53
54int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
55{
56 dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
57 return ili->write(ili, reg, value);
58}
Ben Dookscccb6d32008-07-23 21:31:37 -070059EXPORT_SYMBOL_GPL(ili9320_write);
60
61int ili9320_write_regs(struct ili9320 *ili,
Jingoo Han3fd00432012-12-17 16:00:54 -080062 const struct ili9320_reg *values,
Ben Dookscccb6d32008-07-23 21:31:37 -070063 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}
Ben Dookscccb6d32008-07-23 21:31:37 -070076EXPORT_SYMBOL_GPL(ili9320_write_regs);
77
78static void ili9320_reset(struct ili9320 *lcd)
79{
80 struct ili9320_platdata *cfg = lcd->platdata;
81
82 cfg->reset(1);
83 mdelay(50);
84
85 cfg->reset(0);
86 mdelay(50);
87
88 cfg->reset(1);
89 mdelay(100);
90}
91
92static inline int ili9320_init_chip(struct ili9320 *lcd)
93{
94 int ret;
95
96 ili9320_reset(lcd);
97
98 ret = lcd->client->init(lcd, lcd->platdata);
99 if (ret != 0) {
100 dev_err(lcd->dev, "failed to initialise display\n");
101 return ret;
102 }
103
104 lcd->initialised = 1;
105 return 0;
106}
107
108static inline int ili9320_power_on(struct ili9320 *lcd)
109{
110 if (!lcd->initialised)
111 ili9320_init_chip(lcd);
112
113 lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
114 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
115
116 return 0;
117}
118
119static inline int ili9320_power_off(struct ili9320 *lcd)
120{
121 lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
122 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
123
124 return 0;
125}
126
127#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
128
129static int ili9320_power(struct ili9320 *lcd, int power)
130{
131 int ret = 0;
132
133 dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
134
135 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
136 ret = ili9320_power_on(lcd);
137 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
138 ret = ili9320_power_off(lcd);
139
140 if (ret == 0)
141 lcd->power = power;
142 else
143 dev_warn(lcd->dev, "failed to set power mode %d\n", power);
144
145 return ret;
146}
147
148static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
149{
150 return lcd_get_data(lcd);
151}
152
153static int ili9320_set_power(struct lcd_device *ld, int power)
154{
155 struct ili9320 *lcd = to_our_lcd(ld);
156
157 return ili9320_power(lcd, power);
158}
159
160static int ili9320_get_power(struct lcd_device *ld)
161{
162 struct ili9320 *lcd = to_our_lcd(ld);
163
164 return lcd->power;
165}
166
167static struct lcd_ops ili9320_ops = {
168 .get_power = ili9320_get_power,
169 .set_power = ili9320_set_power,
170};
171
Bill Pemberton1b9e4502012-11-19 13:21:46 -0500172static void ili9320_setup_spi(struct ili9320 *ili,
Ben Dookscccb6d32008-07-23 21:31:37 -0700173 struct spi_device *dev)
174{
175 struct ili9320_spi *spi = &ili->access.spi;
176
177 ili->write = ili9320_write_spi;
178 spi->dev = dev;
179
180 /* fill the two messages we are going to use to send the data
181 * with, the first the address followed by the data. The datasheet
182 * says they should be done as two distinct cycles of the SPI CS line.
183 */
184
185 spi->xfer[0].tx_buf = spi->buffer_addr;
186 spi->xfer[1].tx_buf = spi->buffer_data;
187 spi->xfer[0].len = 3;
188 spi->xfer[1].len = 3;
189 spi->xfer[0].bits_per_word = 8;
190 spi->xfer[1].bits_per_word = 8;
191 spi->xfer[0].cs_change = 1;
192
193 spi_message_init(&spi->message);
194 spi_message_add_tail(&spi->xfer[0], &spi->message);
195 spi_message_add_tail(&spi->xfer[1], &spi->message);
196}
197
Bill Pemberton1b9e4502012-11-19 13:21:46 -0500198int ili9320_probe_spi(struct spi_device *spi,
Ben Dookscccb6d32008-07-23 21:31:37 -0700199 struct ili9320_client *client)
200{
201 struct ili9320_platdata *cfg = spi->dev.platform_data;
202 struct device *dev = &spi->dev;
203 struct ili9320 *ili;
204 struct lcd_device *lcd;
205 int ret = 0;
206
207 /* verify we where given some information */
208
209 if (cfg == NULL) {
210 dev_err(dev, "no platform data supplied\n");
211 return -EINVAL;
212 }
213
214 if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
215 dev_err(dev, "invalid platform data supplied\n");
216 return -EINVAL;
217 }
218
219 /* allocate and initialse our state */
220
Jingoo Han9828eb02012-05-29 15:07:22 -0700221 ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
Ben Dookscccb6d32008-07-23 21:31:37 -0700222 if (ili == NULL) {
223 dev_err(dev, "no memory for device\n");
224 return -ENOMEM;
225 }
226
227 ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
228
229 ili->dev = dev;
230 ili->client = client;
231 ili->power = FB_BLANK_POWERDOWN;
232 ili->platdata = cfg;
233
234 dev_set_drvdata(&spi->dev, ili);
235
236 ili9320_setup_spi(ili, spi);
237
238 lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
239 if (IS_ERR(lcd)) {
240 dev_err(dev, "failed to register lcd device\n");
Jingoo Han9828eb02012-05-29 15:07:22 -0700241 return PTR_ERR(lcd);
Ben Dookscccb6d32008-07-23 21:31:37 -0700242 }
243
244 ili->lcd = lcd;
245
246 dev_info(dev, "initialising %s\n", client->name);
247
248 ret = ili9320_power(ili, FB_BLANK_UNBLANK);
249 if (ret != 0) {
250 dev_err(dev, "failed to set lcd power state\n");
251 goto err_unregister;
252 }
253
254 return 0;
255
256 err_unregister:
257 lcd_device_unregister(lcd);
258
Ben Dookscccb6d32008-07-23 21:31:37 -0700259 return ret;
260}
Ben Dookscccb6d32008-07-23 21:31:37 -0700261EXPORT_SYMBOL_GPL(ili9320_probe_spi);
262
Arnd Bergmannff944042012-05-15 15:02:58 -0600263int ili9320_remove(struct ili9320 *ili)
Ben Dookscccb6d32008-07-23 21:31:37 -0700264{
265 ili9320_power(ili, FB_BLANK_POWERDOWN);
266
267 lcd_device_unregister(ili->lcd);
Ben Dookscccb6d32008-07-23 21:31:37 -0700268
269 return 0;
270}
Ben Dookscccb6d32008-07-23 21:31:37 -0700271EXPORT_SYMBOL_GPL(ili9320_remove);
272
273#ifdef CONFIG_PM
274int ili9320_suspend(struct ili9320 *lcd, pm_message_t state)
275{
276 int ret;
277
278 dev_dbg(lcd->dev, "%s: event %d\n", __func__, state.event);
279
280 if (state.event == PM_EVENT_SUSPEND) {
281 ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
282
283 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
284 ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
285 ILI9320_POWER1_SLP |
286 ILI9320_POWER1_DSTB);
287 lcd->initialised = 0;
288 }
289
290 return ret;
291 }
292
293 return 0;
294}
Ben Dookscccb6d32008-07-23 21:31:37 -0700295EXPORT_SYMBOL_GPL(ili9320_suspend);
296
297int ili9320_resume(struct ili9320 *lcd)
298{
299 dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
300
Jingoo Hanc0b6cc42012-12-17 16:00:19 -0800301 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
Ben Dookscccb6d32008-07-23 21:31:37 -0700302 ili9320_write(lcd, ILI9320_POWER1, 0x00);
Ben Dookscccb6d32008-07-23 21:31:37 -0700303
304 return ili9320_power(lcd, FB_BLANK_UNBLANK);
305}
Ben Dookscccb6d32008-07-23 21:31:37 -0700306EXPORT_SYMBOL_GPL(ili9320_resume);
307#endif
308
309/* Power down all displays on reboot, poweroff or halt */
310void ili9320_shutdown(struct ili9320 *lcd)
311{
312 ili9320_power(lcd, FB_BLANK_POWERDOWN);
313}
Ben Dookscccb6d32008-07-23 21:31:37 -0700314EXPORT_SYMBOL_GPL(ili9320_shutdown);
315
316MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
317MODULE_DESCRIPTION("ILI9320 LCD Driver");
318MODULE_LICENSE("GPL v2");