1 /* 2 * l4f00242t03.c -- support for Epson L4F00242T03 LCD 3 * 4 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. 5 * 6 * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> 7 * Inspired by Marek Vasut work in l4f00242t03.c 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/device.h> 15 #include <linux/kernel.h> 16 #include <linux/delay.h> 17 #include <linux/gpio.h> 18 #include <linux/lcd.h> 19 #include <linux/slab.h> 20 #include <linux/regulator/consumer.h> 21 22 #include <linux/spi/spi.h> 23 #include <linux/spi/l4f00242t03.h> 24 25 struct l4f00242t03_priv { 26 struct spi_device *spi; 27 struct lcd_device *ld; 28 int lcd_state; 29 struct regulator *io_reg; 30 struct regulator *core_reg; 31 }; 32 33 34 static void l4f00242t03_reset(unsigned int gpio) 35 { 36 pr_debug("l4f00242t03_reset.\n"); 37 gpio_set_value(gpio, 1); 38 mdelay(100); 39 gpio_set_value(gpio, 0); 40 mdelay(10); /* tRES >= 100us */ 41 gpio_set_value(gpio, 1); 42 mdelay(20); 43 } 44 45 #define param(x) ((x) | 0x100) 46 47 static void l4f00242t03_lcd_init(struct spi_device *spi) 48 { 49 struct l4f00242t03_pdata *pdata = spi->dev.platform_data; 50 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 51 const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) }; 52 53 dev_dbg(&spi->dev, "initializing LCD\n"); 54 55 if (priv->io_reg) { 56 regulator_set_voltage(priv->io_reg, 1800000, 1800000); 57 regulator_enable(priv->io_reg); 58 } 59 60 if (priv->core_reg) { 61 regulator_set_voltage(priv->core_reg, 2800000, 2800000); 62 regulator_enable(priv->core_reg); 63 } 64 65 l4f00242t03_reset(pdata->reset_gpio); 66 67 gpio_set_value(pdata->data_enable_gpio, 1); 68 msleep(60); 69 spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16)); 70 } 71 72 static void l4f00242t03_lcd_powerdown(struct spi_device *spi) 73 { 74 struct l4f00242t03_pdata *pdata = spi->dev.platform_data; 75 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 76 77 dev_dbg(&spi->dev, "Powering down LCD\n"); 78 79 gpio_set_value(pdata->data_enable_gpio, 0); 80 81 if (priv->io_reg) 82 regulator_disable(priv->io_reg); 83 84 if (priv->core_reg) 85 regulator_disable(priv->core_reg); 86 } 87 88 static int l4f00242t03_lcd_power_get(struct lcd_device *ld) 89 { 90 struct l4f00242t03_priv *priv = lcd_get_data(ld); 91 92 return priv->lcd_state; 93 } 94 95 static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power) 96 { 97 struct l4f00242t03_priv *priv = lcd_get_data(ld); 98 struct spi_device *spi = priv->spi; 99 100 const u16 slpout = 0x11; 101 const u16 dison = 0x29; 102 103 const u16 slpin = 0x10; 104 const u16 disoff = 0x28; 105 106 if (power <= FB_BLANK_NORMAL) { 107 if (priv->lcd_state <= FB_BLANK_NORMAL) { 108 /* Do nothing, the LCD is running */ 109 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { 110 dev_dbg(&spi->dev, "Resuming LCD\n"); 111 112 spi_write(spi, (const u8 *)&slpout, sizeof(u16)); 113 msleep(60); 114 spi_write(spi, (const u8 *)&dison, sizeof(u16)); 115 } else { 116 /* priv->lcd_state == FB_BLANK_POWERDOWN */ 117 l4f00242t03_lcd_init(spi); 118 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; 119 l4f00242t03_lcd_power_set(priv->ld, power); 120 } 121 } else if (power < FB_BLANK_POWERDOWN) { 122 if (priv->lcd_state <= FB_BLANK_NORMAL) { 123 /* Send the display in standby */ 124 dev_dbg(&spi->dev, "Standby the LCD\n"); 125 126 spi_write(spi, (const u8 *)&disoff, sizeof(u16)); 127 msleep(60); 128 spi_write(spi, (const u8 *)&slpin, sizeof(u16)); 129 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { 130 /* Do nothing, the LCD is already in standby */ 131 } else { 132 /* priv->lcd_state == FB_BLANK_POWERDOWN */ 133 l4f00242t03_lcd_init(spi); 134 priv->lcd_state = FB_BLANK_UNBLANK; 135 l4f00242t03_lcd_power_set(ld, power); 136 } 137 } else { 138 /* power == FB_BLANK_POWERDOWN */ 139 if (priv->lcd_state != FB_BLANK_POWERDOWN) { 140 /* Clear the screen before shutting down */ 141 spi_write(spi, (const u8 *)&disoff, sizeof(u16)); 142 msleep(60); 143 l4f00242t03_lcd_powerdown(spi); 144 } 145 } 146 147 priv->lcd_state = power; 148 149 return 0; 150 } 151 152 static struct lcd_ops l4f_ops = { 153 .set_power = l4f00242t03_lcd_power_set, 154 .get_power = l4f00242t03_lcd_power_get, 155 }; 156 157 static int __devinit l4f00242t03_probe(struct spi_device *spi) 158 { 159 struct l4f00242t03_priv *priv; 160 struct l4f00242t03_pdata *pdata = spi->dev.platform_data; 161 int ret; 162 163 if (pdata == NULL) { 164 dev_err(&spi->dev, "Uninitialized platform data.\n"); 165 return -EINVAL; 166 } 167 168 priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL); 169 170 if (priv == NULL) { 171 dev_err(&spi->dev, "No memory for this device.\n"); 172 return -ENOMEM; 173 } 174 175 dev_set_drvdata(&spi->dev, priv); 176 spi->bits_per_word = 9; 177 spi_setup(spi); 178 179 priv->spi = spi; 180 181 ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset"); 182 if (ret) { 183 dev_err(&spi->dev, 184 "Unable to get the lcd l4f00242t03 reset gpio.\n"); 185 goto err; 186 } 187 188 ret = gpio_direction_output(pdata->reset_gpio, 1); 189 if (ret) 190 goto err2; 191 192 ret = gpio_request(pdata->data_enable_gpio, 193 "lcd l4f00242t03 data enable"); 194 if (ret) { 195 dev_err(&spi->dev, 196 "Unable to get the lcd l4f00242t03 data en gpio.\n"); 197 goto err2; 198 } 199 200 ret = gpio_direction_output(pdata->data_enable_gpio, 0); 201 if (ret) 202 goto err3; 203 204 if (pdata->io_supply) { 205 priv->io_reg = regulator_get(NULL, pdata->io_supply); 206 207 if (IS_ERR(priv->io_reg)) { 208 pr_err("%s: Unable to get the IO regulator\n", 209 __func__); 210 goto err3; 211 } 212 } 213 214 if (pdata->core_supply) { 215 priv->core_reg = regulator_get(NULL, pdata->core_supply); 216 217 if (IS_ERR(priv->core_reg)) { 218 pr_err("%s: Unable to get the core regulator\n", 219 __func__); 220 goto err4; 221 } 222 } 223 224 priv->ld = lcd_device_register("l4f00242t03", 225 &spi->dev, priv, &l4f_ops); 226 if (IS_ERR(priv->ld)) { 227 ret = PTR_ERR(priv->ld); 228 goto err5; 229 } 230 231 /* Init the LCD */ 232 l4f00242t03_lcd_init(spi); 233 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; 234 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK); 235 236 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); 237 238 return 0; 239 240 err5: 241 if (priv->core_reg) 242 regulator_put(priv->core_reg); 243 err4: 244 if (priv->io_reg) 245 regulator_put(priv->io_reg); 246 err3: 247 gpio_free(pdata->data_enable_gpio); 248 err2: 249 gpio_free(pdata->reset_gpio); 250 err: 251 kfree(priv); 252 253 return ret; 254 } 255 256 static int __devexit l4f00242t03_remove(struct spi_device *spi) 257 { 258 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 259 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data; 260 261 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); 262 lcd_device_unregister(priv->ld); 263 264 dev_set_drvdata(&spi->dev, NULL); 265 266 gpio_free(pdata->data_enable_gpio); 267 gpio_free(pdata->reset_gpio); 268 269 if (priv->io_reg) 270 regulator_put(priv->io_reg); 271 if (priv->core_reg) 272 regulator_put(priv->core_reg); 273 274 kfree(priv); 275 276 return 0; 277 } 278 279 static void l4f00242t03_shutdown(struct spi_device *spi) 280 { 281 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 282 283 if (priv) 284 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); 285 286 } 287 288 static struct spi_driver l4f00242t03_driver = { 289 .driver = { 290 .name = "l4f00242t03", 291 .owner = THIS_MODULE, 292 }, 293 .probe = l4f00242t03_probe, 294 .remove = __devexit_p(l4f00242t03_remove), 295 .shutdown = l4f00242t03_shutdown, 296 }; 297 298 static __init int l4f00242t03_init(void) 299 { 300 return spi_register_driver(&l4f00242t03_driver); 301 } 302 303 static __exit void l4f00242t03_exit(void) 304 { 305 spi_unregister_driver(&l4f00242t03_driver); 306 } 307 308 module_init(l4f00242t03_init); 309 module_exit(l4f00242t03_exit); 310 311 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); 312 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); 313 MODULE_LICENSE("GPL v2"); 314