backlight: Add Epson L4F00242T03 LCD driver

The Epson LCD L4F00242T03 is mounted on the Freescale i.MX31 PDK board. 
Based upon Marek Vasut work in l4f00242t03.c, this driver provides
basic init and power on/off functionality for this device through the
sysfs lcd interface.

Unfortunately Datasheet for this device are not available and
all the control sequences sent to the display were copied from the
freescale driver that in the i.MX31 Linux BSP.

As in the i.MX31PDK board the core and io suppliers are voltage
regulators, that functionality is embedded here, but not strict.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

3 files changed, 264 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 0c77fc610212..c025c84601b0 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -31,6 +31,13 @@ config LCD_CORGI
           Say y here to support the LCD panels usually found on SHARP
           corgi (C7x0) and spitz (Cxx00) models.
 
+config LCD_L4F00242T03
+        tristate "Epson L4F00242T03 LCD"
+        depends on LCD_CLASS_DEVICE && SPI_MASTER && GENERIC_GPIO
+        help
+          SPI driver for Epson L4F00242T03. This provides basic support
+          for init and powering the LCD up/down through a sysfs interface.
+
 config LCD_LMS283GF05
         tristate "Samsung LMS283GF05 LCD"
         depends on LCD_CLASS_DEVICE && SPI_MASTER && GENERIC_GPIO
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 6c704d41462d..09d1f14d6257 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -3,6 +3,7 @@
 obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o
 obj-$(CONFIG_LCD_CORGI)            += corgi_lcd.o
 obj-$(CONFIG_LCD_HP700)            += jornada720_lcd.o
+obj-$(CONFIG_LCD_L4F00242T03)      += l4f00242t03.o
 obj-$(CONFIG_LCD_LMS283GF05)       += lms283gf05.o
 obj-$(CONFIG_LCD_LTV350QV)         += ltv350qv.o
 obj-$(CONFIG_LCD_ILI9320)          += ili9320.o
diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
new file mode 100644
index 000000000000..42d061e1403b
--- /dev/null
+++ b/drivers/video/backlight/l4f00242t03.c
@@ -0,0 +1,256 @@
+/*
+ * 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");