3 files changed, 250 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index f86dbfd209ad..c0d4a536ea87 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_LMS283GF05
+        tristate "Samsung LMS283GF05 LCD"
+        depends on LCD_CLASS_DEVICE && SPI_MASTER && GENERIC_GPIO
+        help
+          SPI driver for Samsung LMS283GF05. This provides basic support
+          for powering the LCD up/down through a sysfs interface.
+
 config LCD_LTV350QV
         tristate "Samsung LTV350QV LCD Panel"
         depends on LCD_CLASS_DEVICE && SPI_MASTER
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index df0b67ce88b6..0abc014215ba 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_LMS283GF05)       += lms283gf05.o
 obj-$(CONFIG_LCD_LTV350QV)         += ltv350qv.o
 obj-$(CONFIG_LCD_ILI9320)          += ili9320.o
 obj-$(CONFIG_LCD_PLATFORM)         += platform_lcd.o
diff --git a/drivers/video/backlight/lms283gf05.c b/drivers/video/backlight/lms283gf05.c
new file mode 100644
index 000000000000..447b542a20ca
--- /dev/null
+++ b/drivers/video/backlight/lms283gf05.c
@@ -0,0 +1,242 @@
+/*
+ * lms283gf05.c -- support for Samsung LMS283GF05 LCD
+ *
+ * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * 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/spi/spi.h>
+#include <linux/spi/lms283gf05.h>
+
+struct lms283gf05_state {
+        struct spi_device       *spi;
+        struct lcd_device       *ld;
+};
+
+struct lms283gf05_seq {
+        unsigned char           reg;
+        unsigned short          value;
+        unsigned char           delay;
+};
+
+/* Magic sequences supplied by manufacturer, for details refer to datasheet */
+static struct lms283gf05_seq disp_initseq[] = {
+        /* REG, VALUE, DELAY */
+        { 0x07, 0x0000, 0 },
+        { 0x13, 0x0000, 10 },
+
+        { 0x11, 0x3004, 0 },
+        { 0x14, 0x200F, 0 },
+        { 0x10, 0x1a20, 0 },
+        { 0x13, 0x0040, 50 },
+
+        { 0x13, 0x0060, 0 },
+        { 0x13, 0x0070, 200 },
+
+        { 0x01, 0x0127, 0 },
+        { 0x02, 0x0700, 0 },
+        { 0x03, 0x1030, 0 },
+        { 0x08, 0x0208, 0 },
+        { 0x0B, 0x0620, 0 },
+        { 0x0C, 0x0110, 0 },
+        { 0x30, 0x0120, 0 },
+        { 0x31, 0x0127, 0 },
+        { 0x32, 0x0000, 0 },
+        { 0x33, 0x0503, 0 },
+        { 0x34, 0x0727, 0 },
+        { 0x35, 0x0124, 0 },
+        { 0x36, 0x0706, 0 },
+        { 0x37, 0x0701, 0 },
+        { 0x38, 0x0F00, 0 },
+        { 0x39, 0x0F00, 0 },
+        { 0x40, 0x0000, 0 },
+        { 0x41, 0x0000, 0 },
+        { 0x42, 0x013f, 0 },
+        { 0x43, 0x0000, 0 },
+        { 0x44, 0x013f, 0 },
+        { 0x45, 0x0000, 0 },
+        { 0x46, 0xef00, 0 },
+        { 0x47, 0x013f, 0 },
+        { 0x48, 0x0000, 0 },
+        { 0x07, 0x0015, 30 },
+
+        { 0x07, 0x0017, 0 },
+
+        { 0x20, 0x0000, 0 },
+        { 0x21, 0x0000, 0 },
+        { 0x22, 0x0000, 0 }
+};
+
+static struct lms283gf05_seq disp_pdwnseq[] = {
+        { 0x07, 0x0016, 30 },
+
+        { 0x07, 0x0004, 0 },
+        { 0x10, 0x0220, 20 },
+
+        { 0x13, 0x0060, 50 },
+
+        { 0x13, 0x0040, 50 },
+
+        { 0x13, 0x0000, 0 },
+        { 0x10, 0x0000, 0 }
+};
+
+
+static void lms283gf05_reset(unsigned long gpio, bool inverted)
+{
+        gpio_set_value(gpio, !inverted);
+        mdelay(100);
+        gpio_set_value(gpio, inverted);
+        mdelay(20);
+        gpio_set_value(gpio, !inverted);
+        mdelay(20);
+}
+
+static void lms283gf05_toggle(struct spi_device *spi,
+                        struct lms283gf05_seq *seq, int sz)
+{
+        char buf[3];
+        int i;
+
+        for (i = 0; i < sz; i++) {
+                buf[0] = 0x74;
+                buf[1] = 0x00;
+                buf[2] = seq[i].reg;
+                spi_write(spi, buf, 3);
+
+                buf[0] = 0x76;
+                buf[1] = seq[i].value >> 8;
+                buf[2] = seq[i].value & 0xff;
+                spi_write(spi, buf, 3);
+
+                mdelay(seq[i].delay);
+        }
+}
+
+static int lms283gf05_power_set(struct lcd_device *ld, int power)
+{
+        struct lms283gf05_state *st = lcd_get_data(ld);
+        struct spi_device *spi = st->spi;
+        struct lms283gf05_pdata *pdata = spi->dev.platform_data;
+
+        if (power) {
+                if (pdata)
+                        lms283gf05_reset(pdata->reset_gpio,
+                                        pdata->reset_inverted);
+                lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
+        } else {
+                lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
+                if (pdata)
+                        gpio_set_value(pdata->reset_gpio,
+                                        pdata->reset_inverted);
+        }
+
+        return 0;
+}
+
+static struct lcd_ops lms_ops = {
+        .set_power      = lms283gf05_power_set,
+        .get_power      = NULL,
+};
+
+static int __devinit lms283gf05_probe(struct spi_device *spi)
+{
+        struct lms283gf05_state *st;
+        struct lms283gf05_pdata *pdata = spi->dev.platform_data;
+        struct lcd_device *ld;
+        int ret = 0;
+
+        if (pdata != NULL) {
+                ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
+                if (ret)
+                        return ret;
+
+                ret = gpio_direction_output(pdata->reset_gpio,
+                                                !pdata->reset_inverted);
+                if (ret)
+                        goto err;
+        }
+
+        st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
+        if (st == NULL) {
+                dev_err(&spi->dev, "No memory for device state\n");
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
+        if (IS_ERR(ld)) {
+                ret = PTR_ERR(ld);
+                goto err2;
+        }
+
+        st->spi = spi;
+        st->ld = ld;
+
+        dev_set_drvdata(&spi->dev, st);
+
+        /* kick in the LCD */
+        if (pdata)
+                lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
+        lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
+
+        return 0;
+
+err2:
+        kfree(st);
+err:
+        if (pdata != NULL)
+                gpio_free(pdata->reset_gpio);
+
+        return ret;
+}
+
+static int __devexit lms283gf05_remove(struct spi_device *spi)
+{
+        struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
+        struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
+
+        lcd_device_unregister(st->ld);
+
+        if (pdata != NULL)
+                gpio_free(pdata->reset_gpio);
+
+        kfree(st);
+
+        return 0;
+}
+
+static struct spi_driver lms283gf05_driver = {
+        .driver = {
+                .name   = "lms283gf05",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = lms283gf05_probe,
+        .remove         = __devexit_p(lms283gf05_remove),
+};
+
+static __init int lms283gf05_init(void)
+{
+        return spi_register_driver(&lms283gf05_driver);
+}
+
+static __exit void lms283gf05_exit(void)
+{
+        spi_unregister_driver(&lms283gf05_driver);
+}
+
+module_init(lms283gf05_init);
+module_exit(lms283gf05_exit);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("LCD283GF05 LCD");
+MODULE_LICENSE("GPL v2");