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#include <linux/slab.h> 21 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; 48 data[1] = value >> 8; 49 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} 59 60EXPORT_SYMBOL_GPL(ili9320_write); 61 62int ili9320_write_regs(struct ili9320 *ili, 63 struct ili9320_reg *values, 64 int nr_values) 65{ 66 int index; 67 int ret; 68 69 for (index = 0; index < nr_values; index++, values++) { 70 ret = ili9320_write(ili, values->address, values->value); 71 if (ret != 0) 72 return ret; 73 } 74 75 return 0; 76} 77 78EXPORT_SYMBOL_GPL(ili9320_write_regs); 79 80static void ili9320_reset(struct ili9320 *lcd) 81{ 82 struct ili9320_platdata *cfg = lcd->platdata; 83 84 cfg->reset(1); 85 mdelay(50); 86 87 cfg->reset(0); 88 mdelay(50); 89 90 cfg->reset(1); 91 mdelay(100); 92} 93 94static inline int ili9320_init_chip(struct ili9320 *lcd) 95{ 96 int ret; 97 98 ili9320_reset(lcd); 99 100 ret = lcd->client->init(lcd, lcd->platdata); 101 if (ret != 0) { 102 dev_err(lcd->dev, "failed to initialise display\n"); 103 return ret; 104 } 105 106 lcd->initialised = 1; 107 return 0; 108} 109 110static inline int ili9320_power_on(struct ili9320 *lcd) 111{ 112 if (!lcd->initialised) 113 ili9320_init_chip(lcd); 114 115 lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE); 116 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1); 117 118 return 0; 119} 120 121static inline int ili9320_power_off(struct ili9320 *lcd) 122{ 123 lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE); 124 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1); 125 126 return 0; 127} 128 129#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) 130 131static int ili9320_power(struct ili9320 *lcd, int power) 132{ 133 int ret = 0; 134 135 dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power); 136 137 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) 138 ret = ili9320_power_on(lcd); 139 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) 140 ret = ili9320_power_off(lcd); 141 142 if (ret == 0) 143 lcd->power = power; 144 else 145 dev_warn(lcd->dev, "failed to set power mode %d\n", power); 146 147 return ret; 148} 149 150static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd) 151{ 152 return lcd_get_data(lcd); 153} 154 155static int ili9320_set_power(struct lcd_device *ld, int power) 156{ 157 struct ili9320 *lcd = to_our_lcd(ld); 158 159 return ili9320_power(lcd, power); 160} 161 162static int ili9320_get_power(struct lcd_device *ld) 163{ 164 struct ili9320 *lcd = to_our_lcd(ld); 165 166 return lcd->power; 167} 168 169static struct lcd_ops ili9320_ops = { 170 .get_power = ili9320_get_power, 171 .set_power = ili9320_set_power, 172}; 173 174static void __devinit ili9320_setup_spi(struct ili9320 *ili, 175 struct spi_device *dev) 176{ 177 struct ili9320_spi *spi = &ili->access.spi; 178 179 ili->write = ili9320_write_spi; 180 spi->dev = dev; 181 182 /* fill the two messages we are going to use to send the data 183 * with, the first the address followed by the data. The datasheet 184 * says they should be done as two distinct cycles of the SPI CS line. 185 */ 186 187 spi->xfer[0].tx_buf = spi->buffer_addr; 188 spi->xfer[1].tx_buf = spi->buffer_data; 189 spi->xfer[0].len = 3; 190 spi->xfer[1].len = 3; 191 spi->xfer[0].bits_per_word = 8; 192 spi->xfer[1].bits_per_word = 8; 193 spi->xfer[0].cs_change = 1; 194 195 spi_message_init(&spi->message); 196 spi_message_add_tail(&spi->xfer[0], &spi->message); 197 spi_message_add_tail(&spi->xfer[1], &spi->message); 198} 199 200int __devinit ili9320_probe_spi(struct spi_device *spi, 201 struct ili9320_client *client) 202{ 203 struct ili9320_platdata *cfg = spi->dev.platform_data; 204 struct device *dev = &spi->dev; 205 struct ili9320 *ili; 206 struct lcd_device *lcd; 207 int ret = 0; 208 209 /* verify we where given some information */ 210 211 if (cfg == NULL) { 212 dev_err(dev, "no platform data supplied\n"); 213 return -EINVAL; 214 } 215 216 if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) { 217 dev_err(dev, "invalid platform data supplied\n"); 218 return -EINVAL; 219 } 220 221 /* allocate and initialse our state */ 222 223 ili = kzalloc(sizeof(struct ili9320), GFP_KERNEL); 224 if (ili == NULL) { 225 dev_err(dev, "no memory for device\n"); 226 return -ENOMEM; 227 } 228 229 ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1); 230 231 ili->dev = dev; 232 ili->client = client; 233 ili->power = FB_BLANK_POWERDOWN; 234 ili->platdata = cfg; 235 236 dev_set_drvdata(&spi->dev, ili); 237 238 ili9320_setup_spi(ili, spi); 239 240 lcd = lcd_device_register("ili9320", dev, ili, &ili9320_ops); 241 if (IS_ERR(lcd)) { 242 dev_err(dev, "failed to register lcd device\n"); 243 ret = PTR_ERR(lcd); 244 goto err_free; 245 } 246 247 ili->lcd = lcd; 248 249 dev_info(dev, "initialising %s\n", client->name); 250 251 ret = ili9320_power(ili, FB_BLANK_UNBLANK); 252 if (ret != 0) { 253 dev_err(dev, "failed to set lcd power state\n"); 254 goto err_unregister; 255 } 256 257 return 0; 258 259 err_unregister: 260 lcd_device_unregister(lcd); 261 262 err_free: 263 kfree(ili); 264 265 return ret; 266} 267 268EXPORT_SYMBOL_GPL(ili9320_probe_spi); 269 270int __devexit ili9320_remove(struct ili9320 *ili) 271{ 272 ili9320_power(ili, FB_BLANK_POWERDOWN); 273 274 lcd_device_unregister(ili->lcd); 275 kfree(ili); 276 277 return 0; 278} 279 280EXPORT_SYMBOL_GPL(ili9320_remove); 281 282#ifdef CONFIG_PM 283int ili9320_suspend(struct ili9320 *lcd, pm_message_t state) 284{ 285 int ret; 286 287 dev_dbg(lcd->dev, "%s: event %d\n", __func__, state.event); 288 289 if (state.event == PM_EVENT_SUSPEND) { 290 ret = ili9320_power(lcd, FB_BLANK_POWERDOWN); 291 292 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) { 293 ili9320_write(lcd, ILI9320_POWER1, lcd->power1 | 294 ILI9320_POWER1_SLP | 295 ILI9320_POWER1_DSTB); 296 lcd->initialised = 0; 297 } 298 299 return ret; 300 } 301 302 return 0; 303} 304 305EXPORT_SYMBOL_GPL(ili9320_suspend); 306 307int ili9320_resume(struct ili9320 *lcd) 308{ 309 dev_info(lcd->dev, "resuming from power state %d\n", lcd->power); 310 311 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) { 312 ili9320_write(lcd, ILI9320_POWER1, 0x00); 313 } 314 315 return ili9320_power(lcd, FB_BLANK_UNBLANK); 316} 317 318EXPORT_SYMBOL_GPL(ili9320_resume); 319#endif 320 321/* Power down all displays on reboot, poweroff or halt */ 322void ili9320_shutdown(struct ili9320 *lcd) 323{ 324 ili9320_power(lcd, FB_BLANK_POWERDOWN); 325} 326 327EXPORT_SYMBOL_GPL(ili9320_shutdown); 328 329MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>"); 330MODULE_DESCRIPTION("ILI9320 LCD Driver"); 331MODULE_LICENSE("GPL v2"); 332