Merge branch 'master' into for-next

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");