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305 lines
7.7 KiB
Diff
305 lines
7.7 KiB
Diff
From baf5f6c4f4ec0caf5240b452b75eeab2f96d8bd4 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 24 Apr 2010 12:20:56 +0200
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Subject: [PATCH] Add gpm940b0 lcd driver
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---
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drivers/video/backlight/Kconfig | 7 +
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drivers/video/backlight/Makefile | 1 +
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drivers/video/backlight/gpm940b0.c | 253 ++++++++++++++++++++++++++++++++++++
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3 files changed, 261 insertions(+), 0 deletions(-)
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create mode 100644 drivers/video/backlight/gpm940b0.c
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diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
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index c025c84..0a61f91 100644
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--- a/drivers/video/backlight/Kconfig
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+++ b/drivers/video/backlight/Kconfig
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@@ -107,6 +107,13 @@ config LCD_HP700
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If you have an HP Jornada 700 series handheld (710/720/728)
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say Y to enable LCD control driver.
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+config LCD_GPM940B0
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+ tristate "Giantplus GPM940B0 LCD and backlight driver"
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+ depends on LCD_CLASS_DEVICE && SPI
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+ default n
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+ help
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+ LCD and backlight driver for the Giantplus GPM940B0 LCD module.
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+
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#
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# Backlight
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#
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diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
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index 09d1f14..a03ec9c 100644
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--- a/drivers/video/backlight/Makefile
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+++ b/drivers/video/backlight/Makefile
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@@ -11,6 +11,7 @@ obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
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obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
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obj-$(CONFIG_LCD_TDO24M) += tdo24m.o
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obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
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+obj-$(CONFIG_LCD_GPM940B0) += gpm940b0.o
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obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
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obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
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diff --git a/drivers/video/backlight/gpm940b0.c b/drivers/video/backlight/gpm940b0.c
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new file mode 100644
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index 0000000..879e3ad
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--- /dev/null
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+++ b/drivers/video/backlight/gpm940b0.c
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@@ -0,0 +1,253 @@
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+/*
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+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * Driver for Giantplus GPM940B0 LCD
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/spi/spi.h>
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+#include <linux/lcd.h>
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+#include <linux/backlight.h>
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+#include <linux/delay.h>
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+
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+struct gpm940b0 {
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+ struct spi_device *spi;
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+ struct lcd_device *lcd;
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+ struct backlight_device *bl;
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+ unsigned enabled:1;
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+};
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+
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+static int gpm940b0_write_reg(struct spi_device *spi, uint8_t reg,
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+ uint8_t data)
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+{
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+ uint8_t buf[2];
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+ buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
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+ buf[1] = data;
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+
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+ return spi_write(spi, buf, sizeof(buf));
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+}
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+
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+static void gpm940b0_power_disable(struct spi_device *spi)
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+{
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+ int ret = gpm940b0_write_reg(spi, 0x5, 0xc6) ;
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+ if (ret < 0)
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+ dev_err(&spi->dev, "Failed to disable power: %d\n", ret);
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+}
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+
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+static void gpm940b0_power_enable(struct spi_device *spi)
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+{
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+ gpm940b0_write_reg(spi, 0x5, 0xc7);
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+}
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+
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+
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+static int gpm940b0_set_power(struct lcd_device *lcd, int power)
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+{
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+ struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
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+
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+ switch (power) {
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+ case FB_BLANK_UNBLANK:
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+ mdelay(20);
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+ gpm940b0->enabled = 1;
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+ gpm940b0_power_enable(gpm940b0->spi);
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+ break;
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+ default:
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+ gpm940b0->enabled = 0;
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+ gpm940b0_power_disable(gpm940b0->spi);
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+ mdelay(20);
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+ break;
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+ }
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+ return 0;
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+}
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+
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+static int gpm940b0_set_contrast(struct lcd_device *lcd, int contrast)
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+{
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+ struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
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+ gpm940b0_write_reg(gpm940b0->spi, 0x0d, contrast);
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+ return 0;
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+}
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+
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+static int gpm940b0_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
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+{
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+ if (mode->xres != 320 && mode->yres != 240)
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+ return -EINVAL;
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+
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+ return 0;
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+}
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+
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+static ssize_t reg_write(struct device *dev, struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ char *buf2;
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+ uint32_t reg = simple_strtoul(buf, &buf2, 10);
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+ uint32_t val = simple_strtoul(buf2 + 1, NULL, 10);
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+ struct gpm940b0 *gpm940b0 = dev_get_drvdata(dev);
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+
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+ if (reg < 0 || val < 0)
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+ return -EINVAL;
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+
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+ gpm940b0_write_reg(gpm940b0->spi, reg, val);
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+ return count;
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+}
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+
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+static DEVICE_ATTR(reg, 0644, NULL, reg_write);
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+
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+static ssize_t gpm940b0_show_brightness(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ int rc = -ENXIO;
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+
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+ return rc;
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+}
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+
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+static ssize_t gpm940b0_store_brightness(struct device *dev,
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+ struct device_attribute *attr, const char *buf, size_t count)
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+{
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+ char *endp;
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+ struct lcd_device *ld = to_lcd_device(dev);
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+ struct gpm940b0 *gpm940b0 = lcd_get_data(ld);
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+ int brightness = simple_strtoul(buf, &endp, 0);
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+
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+ if (brightness > 255 || brightness < 0)
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+ return -EINVAL;
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+
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+ gpm940b0_write_reg(gpm940b0->spi, 0x3, brightness);
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+
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+ return count;
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+}
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+
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+
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+static DEVICE_ATTR(brightness, 0644, gpm940b0_show_brightness,
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+ gpm940b0_store_brightness);
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+
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+static struct lcd_ops gpm940b0_lcd_ops = {
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+ .set_power = gpm940b0_set_power,
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+ .set_contrast = gpm940b0_set_contrast,
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+ .set_mode = gpm940b0_set_mode,
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+};
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+
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+static int __devinit gpm940b0_probe(struct spi_device *spi)
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+{
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+ int ret;
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+ struct gpm940b0 *gpm940b0;
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+
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+ gpm940b0 = kmalloc(sizeof(*gpm940b0), GFP_KERNEL);
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+
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+ spi->bits_per_word = 8;
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+ spi->mode = SPI_MODE_3 | SPI_3WIRE;
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+
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+ ret = spi_setup(spi);
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+ if (ret) {
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+ dev_err(&spi->dev, "Failed to setup spi\n");
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+ goto err_free_gpm940b0;
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+ }
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+
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+ gpm940b0->spi = spi;
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+
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+ gpm940b0->lcd = lcd_device_register("gpm940b0-lcd", &spi->dev, gpm940b0,
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+ &gpm940b0_lcd_ops);
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+
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+ if (IS_ERR(gpm940b0->lcd)) {
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+ ret = PTR_ERR(gpm940b0->lcd);
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+ dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
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+ goto err_free_gpm940b0;
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+ }
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+
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+ gpm940b0->lcd->props.max_contrast = 255;
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+
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+ ret = device_create_file(&spi->dev, &dev_attr_reg);
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+ if (ret)
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+ goto err_unregister_lcd;
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+
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+ ret = device_create_file(&gpm940b0->lcd->dev, &dev_attr_brightness);
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+ if (ret)
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+ goto err_unregister_lcd;
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+
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+ gpm940b0->enabled = 1;
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+ dev_set_drvdata(&spi->dev, gpm940b0);
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+
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+ gpm940b0_write_reg(spi, 0x13, 0x01);
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+ gpm940b0_write_reg(spi, 0x5, 0xc7);
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+ return 0;
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+err_unregister_lcd:
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+ lcd_device_unregister(gpm940b0->lcd);
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+err_free_gpm940b0:
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+ kfree(gpm940b0);
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+ return ret;
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+}
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+
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+static int __devexit gpm940b0_remove(struct spi_device *spi)
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+{
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+ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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+#if 0
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+ if (gpm940b0->bl)
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+ backlight_device_unregister(gpm940b0->bl);
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+#endif
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+
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+ lcd_device_unregister(gpm940b0->lcd);
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+
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+ spi_set_drvdata(spi, NULL);
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+ kfree(gpm940b0);
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+
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+static int gpm940b0_suspend(struct spi_device *spi, pm_message_t state)
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+{
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+ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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+ if (gpm940b0->enabled) {
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+ gpm940b0_power_disable(spi);
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+ mdelay(10);
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+ }
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+ return 0;
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+}
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+
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+static int gpm940b0_resume(struct spi_device *spi)
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+{
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+ struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
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+ if (gpm940b0->enabled)
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+ gpm940b0_power_enable(spi);
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+ return 0;
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+}
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+
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+#else
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+#define gpm940b0_suspend NULL
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+#define gpm940b0_resume NULL
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+#endif
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+
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+static struct spi_driver gpm940b0_driver = {
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+ .driver = {
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+ .name = "gpm940b0",
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = gpm940b0_probe,
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+ .remove = __devexit_p(gpm940b0_remove),
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+ .suspend = gpm940b0_suspend,
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+ .resume = gpm940b0_resume,
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+};
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+
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+static int __init gpm940b0_init(void)
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+{
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+ return spi_register_driver(&gpm940b0_driver);
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+}
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+module_init(gpm940b0_init);
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+
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+static void __exit gpm940b0_exit(void)
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+{
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+ return spi_unregister_driver(&gpm940b0_driver);
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+}
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+module_exit(gpm940b0_exit)
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+
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+MODULE_AUTHOR("Lars-Peter Clausen");
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("LCD and backlight controll for Giantplus GPM940B0");
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+MODULE_ALIAS("spi:gpm940b0");
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--
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1.5.6.5
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