Ben Dooks | cccb6d3 | 2008-07-23 21:31:37 -0700 | [diff] [blame] | 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"); |