1 files changed, 258 insertions, 0 deletions

diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
new file mode 100644
index 000000000000..bcdb12c93efd
--- /dev/null
+++ b/drivers/video/backlight/l4f00242t03.c
@@ -0,0 +1,258 @@
+/*
+ * 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/slab.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");
+MODULE_LICENSE("GPL v2");