--- /dev/null
+/*
+ * l4f00242t03.c -- support for Epson L4F00242T03 LCD
+ *
+ * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
+ * Inspired by Marek Vasut work in l4f00242t03.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/lcd.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/l4f00242t03.h>
+
+struct l4f00242t03_priv {
+ struct spi_device *spi;
+ struct lcd_device *ld;
+ int lcd_on:1;
+ struct regulator *io_reg;
+ struct regulator *core_reg;
+};
+
+
+static void l4f00242t03_reset(unsigned int gpio)
+{
+ pr_debug("l4f00242t03_reset.\n");
+ gpio_set_value(gpio, 1);
+ mdelay(100);
+ gpio_set_value(gpio, 0);
+ mdelay(10); /* tRES >= 100us */
+ gpio_set_value(gpio, 1);
+ mdelay(20);
+}
+
+#define param(x) ((x) | 0x100)
+
+static void l4f00242t03_lcd_init(struct spi_device *spi)
+{
+ struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
+ struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
+ const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
+
+ dev_dbg(&spi->dev, "initializing LCD\n");
+
+ if (priv->io_reg) {
+ regulator_set_voltage(priv->io_reg, 1800000, 1800000);
+ regulator_enable(priv->io_reg);
+ }
+
+ if (priv->core_reg) {
+ regulator_set_voltage(priv->core_reg, 2800000, 2800000);
+ regulator_enable(priv->core_reg);
+ }
+
+ gpio_set_value(pdata->data_enable_gpio, 1);
+ msleep(60);
+ spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
+}
+
+static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
+{
+ struct l4f00242t03_priv *priv = lcd_get_data(ld);
+ struct spi_device *spi = priv->spi;
+
+ const u16 slpout = 0x11;
+ const u16 dison = 0x29;
+
+ const u16 slpin = 0x10;
+ const u16 disoff = 0x28;
+
+ if (power) {
+ if (priv->lcd_on)
+ return 0;
+
+ dev_dbg(&spi->dev, "turning on LCD\n");
+
+ spi_write(spi, (const u8 *)&slpout, sizeof(u16));
+ msleep(60);
+ spi_write(spi, (const u8 *)&dison, sizeof(u16));
+
+ priv->lcd_on = 1;
+ } else {
+ if (!priv->lcd_on)
+ return 0;
+
+ dev_dbg(&spi->dev, "turning off LCD\n");
+
+ spi_write(spi, (const u8 *)&disoff, sizeof(u16));
+ msleep(60);
+ spi_write(spi, (const u8 *)&slpin, sizeof(u16));
+
+ priv->lcd_on = 0;
+ }
+
+ return 0;
+}
+
+static struct lcd_ops l4f_ops = {
+ .set_power = l4f00242t03_lcd_power_set,
+ .get_power = NULL,
+};
+
+static int __devinit l4f00242t03_probe(struct spi_device *spi)
+{
+ struct l4f00242t03_priv *priv;
+ struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
+ int ret;
+
+ if (pdata == NULL) {
+ dev_err(&spi->dev, "Uninitialized platform data.\n");
+ return -EINVAL;
+ }
+
+ priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
+
+ if (priv == NULL) {
+ dev_err(&spi->dev, "No memory for this device.\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ dev_set_drvdata(&spi->dev, priv);
+ spi->bits_per_word = 9;
+ spi_setup(spi);
+
+ priv->spi = spi;
+
+ ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset");
+ if (ret) {
+ dev_err(&spi->dev,
+ "Unable to get the lcd l4f00242t03 reset gpio.\n");
+ return ret;
+ }
+
+ ret = gpio_direction_output(pdata->reset_gpio, 1);
+ if (ret)
+ goto err2;
+
+ ret = gpio_request(pdata->data_enable_gpio,
+ "lcd l4f00242t03 data enable");
+ if (ret) {
+ dev_err(&spi->dev,
+ "Unable to get the lcd l4f00242t03 data en gpio.\n");
+ return ret;
+ }
+
+ ret = gpio_direction_output(pdata->data_enable_gpio, 0);
+ if (ret)
+ goto err3;
+
+ if (pdata->io_supply) {
+ priv->io_reg = regulator_get(NULL, pdata->io_supply);
+
+ if (IS_ERR(priv->io_reg)) {
+ pr_err("%s: Unable to get the IO regulator\n",
+ __func__);
+ goto err3;
+ }
+ }
+
+ if (pdata->core_supply) {
+ priv->core_reg = regulator_get(NULL, pdata->core_supply);
+
+ if (IS_ERR(priv->core_reg)) {
+ pr_err("%s: Unable to get the core regulator\n",
+ __func__);
+ goto err4;
+ }
+ }
+
+ priv->ld = lcd_device_register("l4f00242t03",
+ &spi->dev, priv, &l4f_ops);
+ if (IS_ERR(priv->ld)) {
+ ret = PTR_ERR(priv->ld);
+ goto err5;
+ }
+
+ /* Init the LCD */
+ l4f00242t03_reset(pdata->reset_gpio);
+ l4f00242t03_lcd_init(spi);
+ l4f00242t03_lcd_power_set(priv->ld, 1);
+
+ dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
+
+ return 0;
+
+err5:
+ if (priv->core_reg)
+ regulator_put(priv->core_reg);
+err4:
+ if (priv->io_reg)
+ regulator_put(priv->io_reg);
+err3:
+ gpio_free(pdata->data_enable_gpio);
+err2:
+ gpio_free(pdata->reset_gpio);
+err:
+ kfree(priv);
+
+ return ret;
+}
+
+static int __devexit l4f00242t03_remove(struct spi_device *spi)
+{
+ struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
+ struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
+
+ l4f00242t03_lcd_power_set(priv->ld, 0);
+ lcd_device_unregister(priv->ld);
+
+ gpio_free(pdata->data_enable_gpio);
+ gpio_free(pdata->reset_gpio);
+
+ if (priv->io_reg)
+ regulator_put(priv->core_reg);
+ if (priv->core_reg)
+ regulator_put(priv->io_reg);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static struct spi_driver l4f00242t03_driver = {
+ .driver = {
+ .name = "l4f00242t03",
+ .owner = THIS_MODULE,
+ },
+ .probe = l4f00242t03_probe,
+ .remove = __devexit_p(l4f00242t03_remove),
+};
+
+static __init int l4f00242t03_init(void)
+{
+ return spi_register_driver(&l4f00242t03_driver);
+}
+
+static __exit void l4f00242t03_exit(void)
+{
+ spi_unregister_driver(&l4f00242t03_driver);
+}
+
+module_init(l4f00242t03_init);
+module_exit(l4f00242t03_exit);
+
+MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
+MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
--- /dev/null
+/*
+ * l4f00242t03.h -- Platform glue for Epson L4F00242T03 LCD
+ *
+ * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
+ * Based on Marek Vasut work in lms283gf05.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#ifndef _INCLUDE_LINUX_SPI_L4F00242T03_H_
+#define _INCLUDE_LINUX_SPI_L4F00242T03_H_
+
+struct l4f00242t03_pdata {
+ unsigned int reset_gpio;
+ unsigned int data_enable_gpio;
+ const char *io_supply; /* will be set to 1.8 V */
+ const char *core_supply; /* will be set to 2.8 V */
+};
+
+#endif /* _INCLUDE_LINUX_SPI_L4F00242T03_H_ */
projects / platform / kernel / linux-rpi.git / commitdiff