1 /* drivers/video/backlight/ili9320.c
3 * ILI9320 LCD controller driver core.
5 * Copyright 2007 Simtec Electronics
6 * http://armlinux.simtec.co.uk/
7 * Ben Dooks <ben@simtec.co.uk>
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.
14 #include <linux/delay.h>
15 #include <linux/err.h>
17 #include <linux/init.h>
18 #include <linux/lcd.h>
19 #include <linux/module.h>
21 #include <linux/spi/spi.h>
23 #include <video/ili9320.h>
28 static inline int ili9320_write_spi(struct ili9320 *ili,
32 struct ili9320_spi *spi = &ili->access.spi;
33 unsigned char *addr = spi->buffer_addr;
34 unsigned char *data = spi->buffer_data;
36 /* spi message consits of:
37 * first byte: ID and operation
40 addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
44 /* second message is the data to transfer */
46 data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
50 return spi_sync(spi->dev, &spi->message);
53 int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
55 dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
56 return ili->write(ili, reg, value);
59 EXPORT_SYMBOL_GPL(ili9320_write);
61 int ili9320_write_regs(struct ili9320 *ili,
62 struct ili9320_reg *values,
68 for (index = 0; index < nr_values; index++, values++) {
69 ret = ili9320_write(ili, values->address, values->value);
77 EXPORT_SYMBOL_GPL(ili9320_write_regs);
79 static void ili9320_reset(struct ili9320 *lcd)
81 struct ili9320_platdata *cfg = lcd->platdata;
93 static inline int ili9320_init_chip(struct ili9320 *lcd)
99 ret = lcd->client->init(lcd, lcd->platdata);
101 dev_err(lcd->dev, "failed to initialise display\n");
105 lcd->initialised = 1;
109 static inline int ili9320_power_on(struct ili9320 *lcd)
111 if (!lcd->initialised)
112 ili9320_init_chip(lcd);
114 lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
115 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
120 static inline int ili9320_power_off(struct ili9320 *lcd)
122 lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
123 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
128 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
130 static int ili9320_power(struct ili9320 *lcd, int power)
134 dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
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);
144 dev_warn(lcd->dev, "failed to set power mode %d\n", power);
149 static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
151 return lcd_get_data(lcd);
154 static int ili9320_set_power(struct lcd_device *ld, int power)
156 struct ili9320 *lcd = to_our_lcd(ld);
158 return ili9320_power(lcd, power);
161 static int ili9320_get_power(struct lcd_device *ld)
163 struct ili9320 *lcd = to_our_lcd(ld);
168 static struct lcd_ops ili9320_ops = {
169 .get_power = ili9320_get_power,
170 .set_power = ili9320_set_power,
173 static void __devinit ili9320_setup_spi(struct ili9320 *ili,
174 struct spi_device *dev)
176 struct ili9320_spi *spi = &ili->access.spi;
178 ili->write = ili9320_write_spi;
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.
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;
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);
199 int __devinit ili9320_probe_spi(struct spi_device *spi,
200 struct ili9320_client *client)
202 struct ili9320_platdata *cfg = spi->dev.platform_data;
203 struct device *dev = &spi->dev;
205 struct lcd_device *lcd;
208 /* verify we where given some information */
211 dev_err(dev, "no platform data supplied\n");
215 if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
216 dev_err(dev, "invalid platform data supplied\n");
220 /* allocate and initialse our state */
222 ili = kzalloc(sizeof(struct ili9320), GFP_KERNEL);
224 dev_err(dev, "no memory for device\n");
228 ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
231 ili->client = client;
232 ili->power = FB_BLANK_POWERDOWN;
235 dev_set_drvdata(&spi->dev, ili);
237 ili9320_setup_spi(ili, spi);
239 lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
241 dev_err(dev, "failed to register lcd device\n");
248 dev_info(dev, "initialising %s\n", client->name);
250 ret = ili9320_power(ili, FB_BLANK_UNBLANK);
252 dev_err(dev, "failed to set lcd power state\n");
259 lcd_device_unregister(lcd);
267 EXPORT_SYMBOL_GPL(ili9320_probe_spi);
269 int __devexit ili9320_remove(struct ili9320 *ili)
271 ili9320_power(ili, FB_BLANK_POWERDOWN);
273 lcd_device_unregister(ili->lcd);
279 EXPORT_SYMBOL_GPL(ili9320_remove);
282 int ili9320_suspend(struct ili9320 *lcd, pm_message_t state)
286 dev_dbg(lcd->dev, "%s: event %d\n", __func__, state.event);
288 if (state.event == PM_EVENT_SUSPEND) {
289 ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
291 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
292 ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
294 ILI9320_POWER1_DSTB);
295 lcd->initialised = 0;
304 EXPORT_SYMBOL_GPL(ili9320_suspend);
306 int ili9320_resume(struct ili9320 *lcd)
308 dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
310 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
311 ili9320_write(lcd, ILI9320_POWER1, 0x00);
314 return ili9320_power(lcd, FB_BLANK_UNBLANK);
317 EXPORT_SYMBOL_GPL(ili9320_resume);
320 /* Power down all displays on reboot, poweroff or halt */
321 void ili9320_shutdown(struct ili9320 *lcd)
323 ili9320_power(lcd, FB_BLANK_POWERDOWN);
326 EXPORT_SYMBOL_GPL(ili9320_shutdown);
328 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
329 MODULE_DESCRIPTION("ILI9320 LCD Driver");
330 MODULE_LICENSE("GPL v2");