Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 | /* drivers/video/backlight/ili9320.c
*
* ILI9320 LCD controller driver core.
*
* Copyright 2007 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <video/ili9320.h>
#include "ili9320.h"
static inline int ili9320_write_spi(struct ili9320 *ili,
unsigned int reg,
unsigned int value)
{
struct ili9320_spi *spi = &ili->access.spi;
unsigned char *addr = spi->buffer_addr;
unsigned char *data = spi->buffer_data;
/* spi message consits of:
* first byte: ID and operation
*/
addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
addr[1] = reg >> 8;
addr[2] = reg;
/* second message is the data to transfer */
data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
data[1] = value >> 8;
data[2] = value;
return spi_sync(spi->dev, &spi->message);
}
int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
{
dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
return ili->write(ili, reg, value);
}
EXPORT_SYMBOL_GPL(ili9320_write);
int ili9320_write_regs(struct ili9320 *ili,
struct ili9320_reg *values,
int nr_values)
{
int index;
int ret;
for (index = 0; index < nr_values; index++, values++) {
ret = ili9320_write(ili, values->address, values->value);
if (ret != 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(ili9320_write_regs);
static void ili9320_reset(struct ili9320 *lcd)
{
struct ili9320_platdata *cfg = lcd->platdata;
cfg->reset(1);
mdelay(50);
cfg->reset(0);
mdelay(50);
cfg->reset(1);
mdelay(100);
}
static inline int ili9320_init_chip(struct ili9320 *lcd)
{
int ret;
ili9320_reset(lcd);
ret = lcd->client->init(lcd, lcd->platdata);
if (ret != 0) {
dev_err(lcd->dev, "failed to initialise display\n");
return ret;
}
lcd->initialised = 1;
return 0;
}
static inline int ili9320_power_on(struct ili9320 *lcd)
{
if (!lcd->initialised)
ili9320_init_chip(lcd);
lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
return 0;
}
static inline int ili9320_power_off(struct ili9320 *lcd)
{
lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
return 0;
}
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
static int ili9320_power(struct ili9320 *lcd, int power)
{
int ret = 0;
dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
ret = ili9320_power_on(lcd);
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
ret = ili9320_power_off(lcd);
if (ret == 0)
lcd->power = power;
else
dev_warn(lcd->dev, "failed to set power mode %d\n", power);
return ret;
}
static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
{
return lcd_get_data(lcd);
}
static int ili9320_set_power(struct lcd_device *ld, int power)
{
struct ili9320 *lcd = to_our_lcd(ld);
return ili9320_power(lcd, power);
}
static int ili9320_get_power(struct lcd_device *ld)
{
struct ili9320 *lcd = to_our_lcd(ld);
return lcd->power;
}
static struct lcd_ops ili9320_ops = {
.get_power = ili9320_get_power,
.set_power = ili9320_set_power,
};
static void __devinit ili9320_setup_spi(struct ili9320 *ili,
struct spi_device *dev)
{
struct ili9320_spi *spi = &ili->access.spi;
ili->write = ili9320_write_spi;
spi->dev = dev;
/* fill the two messages we are going to use to send the data
* with, the first the address followed by the data. The datasheet
* says they should be done as two distinct cycles of the SPI CS line.
*/
spi->xfer[0].tx_buf = spi->buffer_addr;
spi->xfer[1].tx_buf = spi->buffer_data;
spi->xfer[0].len = 3;
spi->xfer[1].len = 3;
spi->xfer[0].bits_per_word = 8;
spi->xfer[1].bits_per_word = 8;
spi->xfer[0].cs_change = 1;
spi_message_init(&spi->message);
spi_message_add_tail(&spi->xfer[0], &spi->message);
spi_message_add_tail(&spi->xfer[1], &spi->message);
}
int __devinit ili9320_probe_spi(struct spi_device *spi,
struct ili9320_client *client)
{
struct ili9320_platdata *cfg = spi->dev.platform_data;
struct device *dev = &spi->dev;
struct ili9320 *ili;
struct lcd_device *lcd;
int ret = 0;
/* verify we where given some information */
if (cfg == NULL) {
dev_err(dev, "no platform data supplied\n");
return -EINVAL;
}
if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
dev_err(dev, "invalid platform data supplied\n");
return -EINVAL;
}
/* allocate and initialse our state */
ili = kzalloc(sizeof(struct ili9320), GFP_KERNEL);
if (ili == NULL) {
dev_err(dev, "no memory for device\n");
return -ENOMEM;
}
ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
ili->dev = dev;
ili->client = client;
ili->power = FB_BLANK_POWERDOWN;
ili->platdata = cfg;
dev_set_drvdata(&spi->dev, ili);
ili9320_setup_spi(ili, spi);
lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops);
if (IS_ERR(lcd)) {
dev_err(dev, "failed to register lcd device\n");
ret = PTR_ERR(lcd);
goto err_free;
}
ili->lcd = lcd;
dev_info(dev, "initialising %s\n", client->name);
ret = ili9320_power(ili, FB_BLANK_UNBLANK);
if (ret != 0) {
dev_err(dev, "failed to set lcd power state\n");
goto err_unregister;
}
return 0;
err_unregister:
lcd_device_unregister(lcd);
err_free:
kfree(ili);
return ret;
}
EXPORT_SYMBOL_GPL(ili9320_probe_spi);
int __devexit ili9320_remove(struct ili9320 *ili)
{
ili9320_power(ili, FB_BLANK_POWERDOWN);
lcd_device_unregister(ili->lcd);
kfree(ili);
return 0;
}
EXPORT_SYMBOL_GPL(ili9320_remove);
#ifdef CONFIG_PM
int ili9320_suspend(struct ili9320 *lcd, pm_message_t state)
{
int ret;
dev_dbg(lcd->dev, "%s: event %d\n", __func__, state.event);
if (state.event == PM_EVENT_SUSPEND) {
ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
ILI9320_POWER1_SLP |
ILI9320_POWER1_DSTB);
lcd->initialised = 0;
}
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(ili9320_suspend);
int ili9320_resume(struct ili9320 *lcd)
{
dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
ili9320_write(lcd, ILI9320_POWER1, 0x00);
}
return ili9320_power(lcd, FB_BLANK_UNBLANK);
}
EXPORT_SYMBOL_GPL(ili9320_resume);
#endif
/* Power down all displays on reboot, poweroff or halt */
void ili9320_shutdown(struct ili9320 *lcd)
{
ili9320_power(lcd, FB_BLANK_POWERDOWN);
}
EXPORT_SYMBOL_GPL(ili9320_shutdown);
MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
MODULE_DESCRIPTION("ILI9320 LCD Driver");
MODULE_LICENSE("GPL v2");
|