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"); 331