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 <= FB_BLANK_NORMAL) { 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 return -ENOMEM; 129 } 130 131 dev_set_drvdata(&spi->dev, priv); 132 spi->bits_per_word = 9; 133 spi_setup(spi); 134 135 priv->spi = spi; 136 137 ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset"); 138 if (ret) { 139 dev_err(&spi->dev, 140 "Unable to get the lcd l4f00242t03 reset gpio.\n"); 141 goto err; 142 } 143 144 ret = gpio_direction_output(pdata->reset_gpio, 1); 145 if (ret) 146 goto err2; 147 148 ret = gpio_request(pdata->data_enable_gpio, 149 "lcd l4f00242t03 data enable"); 150 if (ret) { 151 dev_err(&spi->dev, 152 "Unable to get the lcd l4f00242t03 data en gpio.\n"); 153 goto err2; 154 } 155 156 ret = gpio_direction_output(pdata->data_enable_gpio, 0); 157 if (ret) 158 goto err3; 159 160 if (pdata->io_supply) { 161 priv->io_reg = regulator_get(NULL, pdata->io_supply); 162 163 if (IS_ERR(priv->io_reg)) { 164 pr_err("%s: Unable to get the IO regulator\n", 165 __func__); 166 goto err3; 167 } 168 } 169 170 if (pdata->core_supply) { 171 priv->core_reg = regulator_get(NULL, pdata->core_supply); 172 173 if (IS_ERR(priv->core_reg)) { 174 pr_err("%s: Unable to get the core regulator\n", 175 __func__); 176 goto err4; 177 } 178 } 179 180 priv->ld = lcd_device_register("l4f00242t03", 181 &spi->dev, priv, &l4f_ops); 182 if (IS_ERR(priv->ld)) { 183 ret = PTR_ERR(priv->ld); 184 goto err5; 185 } 186 187 /* Init the LCD */ 188 l4f00242t03_reset(pdata->reset_gpio); 189 l4f00242t03_lcd_init(spi); 190 l4f00242t03_lcd_power_set(priv->ld, 1); 191 192 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); 193 194 return 0; 195 196 err5: 197 if (priv->core_reg) 198 regulator_put(priv->core_reg); 199 err4: 200 if (priv->io_reg) 201 regulator_put(priv->io_reg); 202 err3: 203 gpio_free(pdata->data_enable_gpio); 204 err2: 205 gpio_free(pdata->reset_gpio); 206 err: 207 kfree(priv); 208 209 return ret; 210 } 211 212 static int __devexit l4f00242t03_remove(struct spi_device *spi) 213 { 214 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); 215 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data; 216 217 l4f00242t03_lcd_power_set(priv->ld, 0); 218 lcd_device_unregister(priv->ld); 219 220 gpio_free(pdata->data_enable_gpio); 221 gpio_free(pdata->reset_gpio); 222 223 if (priv->io_reg) 224 regulator_put(priv->io_reg); 225 if (priv->core_reg) 226 regulator_put(priv->core_reg); 227 228 kfree(priv); 229 230 return 0; 231 } 232 233 static struct spi_driver l4f00242t03_driver = { 234 .driver = { 235 .name = "l4f00242t03", 236 .owner = THIS_MODULE, 237 }, 238 .probe = l4f00242t03_probe, 239 .remove = __devexit_p(l4f00242t03_remove), 240 }; 241 242 static __init int l4f00242t03_init(void) 243 { 244 return spi_register_driver(&l4f00242t03_driver); 245 } 246 247 static __exit void l4f00242t03_exit(void) 248 { 249 spi_unregister_driver(&l4f00242t03_driver); 250 } 251 252 module_init(l4f00242t03_init); 253 module_exit(l4f00242t03_exit); 254 255 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); 256 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); 257 MODULE_LICENSE("GPL v2"); 258