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_on:1; 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 gpio_set_value(pdata->data_enable_gpio, 1); 66 msleep(60); 67 spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16)); 68 } 69 70 static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power) 71 { 72 struct l4f00242t03_priv *priv = lcd_get_data(ld); 73 struct spi_device *spi = priv->spi; 74 75 const u16 slpout = 0x11; 76 const u16 dison = 0x29; 77 78 const u16 slpin = 0x10; 79 const u16 disoff = 0x28; 80 81 if (power) { 82 if (priv->lcd_on) 83 return 0; 84 85 dev_dbg(&spi->dev, "turning on LCD\n"); 86 87 spi_write(spi, (const u8 *)&slpout, sizeof(u16)); 88 msleep(60); 89 spi_write(spi, (const u8 *)&dison, sizeof(u16)); 90 91 priv->lcd_on = 1; 92 } else { 93 if (!priv->lcd_on) 94 return 0; 95 96 dev_dbg(&spi->dev, "turning off LCD\n"); 97 98 spi_write(spi, (const u8 *)&disoff, sizeof(u16)); 99 msleep(60); 100 spi_write(spi, (const u8 *)&slpin, sizeof(u16)); 101 102 priv->lcd_on = 0; 103 } 104 105 return 0; 106 } 107 108 static struct lcd_ops l4f_ops = { 109 .set_power = l4f00242t03_lcd_power_set, 110 .get_power = NULL, 111 }; 112 113 static int __devinit l4f00242t03_probe(struct spi_device *spi) 114 { 115 struct l4f00242t03_priv *priv; 116 struct l4f00242t03_pdata *pdata = spi->dev.platform_data; 117 int ret; 118 119 if (pdata == NULL) { 120 dev_err(&spi->dev, "Uninitialized platform data.\n"); 121 return -EINVAL; 122 } 123 124 priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL); 125 126 if (priv == NULL) { 127 dev_err(&spi->dev, "No memory for this device.\n"); 128 ret = -ENOMEM; 129 goto err; 130 } 131 132 dev_set_drvdata(&spi->dev, priv); 133 spi->bits_per_word = 9; 134 spi_setup(spi); 135 136 priv->spi = spi; 137 138 ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset"); 139 if (ret) { 140 dev_err(&spi->dev, 141 "Unable to get the lcd l4f00242t03 reset gpio.\n"); 142 return ret; 143 } 144 145 ret = gpio_direction_output(pdata->reset_gpio, 1); 146 if (ret) 147 goto err2; 148 149 ret = gpio_request(pdata->data_enable_gpio, 150 "lcd l4f00242t03 data enable"); 151 if (ret) { 152 dev_err(&spi->dev, 153 "Unable to get the lcd l4f00242t03 data en gpio.\n"); 154 return ret; 155 } 156 157 ret = gpio_direction_output(pdata->data_enable_gpio, 0); 158 if (ret) 159 goto err3; 160 161 if (pdata->io_supply) { 162 priv->io_reg = regulator_get(NULL, pdata->io_supply); 163 164 if (IS_ERR(priv->io_reg)) { 165 pr_err("%s: Unable to get the IO regulator\n", 166 __func__); 167 goto err3; 168 } 169 } 170 171 if (pdata->core_supply) { 172 priv->core_reg = regulator_get(NULL, pdata->core_supply); 173 174 if (IS_ERR(priv->core_reg)) { 175 pr_err("%s: Unable to get the core regulator\n", 176 __func__); 177 goto err4; 178 } 179 } 180 181 priv->ld = lcd_device_register("l4f00242t03", 182 &spi->dev, priv, &l4f_ops); 183 if (IS_ERR(priv->ld)) { 184 ret = PTR_ERR(priv->ld); 185 goto err5; 186 } 187 188 /* Init the LCD */ 189 l4f00242t03_reset(pdata->reset_gpio); 190 l4f00242t03_lcd_init(spi); 191 l4f00242t03_lcd_power_set(priv->ld, 1); 192 193 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); 194 195 return 0; 196 197 err5: 198 if (priv->core_reg) 199 regulator_put(priv->core_reg); 200 err4: 201 if (priv->io_reg) 202 regulator_put(priv->io_reg); 203 err3: 204 gpio_free(pdata->data_enable_gpio); 205 err2: 206 gpio_free(pdata->reset_gpio); 207 err: 208 kfree(priv); 209 210 return ret; 211 } 212 213 static int __devexit l4f00242t03_remove(struct spi_device *spi) 214 { 215 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 216 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data; 217 218 l4f00242t03_lcd_power_set(priv->ld, 0); 219 lcd_device_unregister(priv->ld); 220 221 gpio_free(pdata->data_enable_gpio); 222 gpio_free(pdata->reset_gpio); 223 224 if (priv->io_reg) 225 regulator_put(priv->core_reg); 226 if (priv->core_reg) 227 regulator_put(priv->io_reg); 228 229 kfree(priv); 230 231 return 0; 232 } 233 234 static struct spi_driver l4f00242t03_driver = { 235 .driver = { 236 .name = "l4f00242t03", 237 .owner = THIS_MODULE, 238 }, 239 .probe = l4f00242t03_probe, 240 .remove = __devexit_p(l4f00242t03_remove), 241 }; 242 243 static __init int l4f00242t03_init(void) 244 { 245 return spi_register_driver(&l4f00242t03_driver); 246 } 247 248 static __exit void l4f00242t03_exit(void) 249 { 250 spi_unregister_driver(&l4f00242t03_driver); 251 } 252 253 module_init(l4f00242t03_init); 254 module_exit(l4f00242t03_exit); 255 256 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); 257 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); 258 MODULE_LICENSE("GPL v2"); 259