+++ /dev/null
-/*
- * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
- * JZ4720/JZ4740 SoC LCD framebuffer driver
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#include <linux/module.h>
-#include <linux/spi/spi.h>
-#include <linux/lcd.h>
-#include <linux/backlight.h>
-#include <linux/delay.h>
-
-struct gpm940b0 {
- struct spi_device *spi;
- struct lcd_device *lcd;
- struct backlight_device *bl;
- unsigned enabled:1;
-};
-
-static int gpm940b0_write_reg(struct spi_device *spi, uint8_t reg,
- uint8_t data)
-{
- uint8_t buf[2];
- buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
- buf[1] = data;
-
- return spi_write(spi, buf, sizeof(buf));
-}
-
-static void gpm940b0_power_disable(struct gpm940b0 *gpm940b0)
-{
- int ret = gpm940b0_write_reg(gpm940b0->spi, 0x5, 0xc6) ;
- if (ret < 0)
- printk("Failed to disable power: %d\n", ret);
-}
-
-static void gpm940b0_power_enable(struct gpm940b0 *gpm940b0)
-{
- gpm940b0_write_reg(gpm940b0->spi, 0x5, 0xc7);
-}
-
-
-static int gpm940b0_set_power(struct lcd_device *lcd, int power)
-{
- struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
-
- switch (power) {
- case FB_BLANK_UNBLANK:
- mdelay(20);
- gpm940b0->enabled = 1;
- gpm940b0_power_enable(gpm940b0);
- break;
- default:
- gpm940b0->enabled = 0;
- gpm940b0_power_disable(gpm940b0);
- mdelay(20);
- break;
- }
- return 0;
-}
-
-static int gpm940b0_set_contrast(struct lcd_device *lcd, int contrast)
-{
- struct gpm940b0 *gpm940b0 = lcd_get_data(lcd);
- gpm940b0_write_reg(gpm940b0->spi, 0x0d, contrast);
- return 0;
-}
-
-static int gpm940b0_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
-{
- if (mode->xres != 320 && mode->yres != 240)
- return -EINVAL;
-
- return 0;
-}
-
-/*
-int gpm940b0_bl_update_status(struct backlight_device *bl)
-{
- struct gpm940b0 *gpm940b0 = bl_get_data(bl);
-
- gpm940b0->reg5 &= ~0x38;
- gpm940b0->reg5 |= ((bl->props.brightness << 3) & 0x38);
-
- gpm940b0_write_reg(gpm940b0->spi, 0x5, gpm940b0->reg5);
-
- return 0;
-}*/
-
-static ssize_t reg_write(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- char *buf2;
- uint32_t reg = simple_strtoul(buf, &buf2, 10);
- uint32_t val = simple_strtoul(buf2 + 1, NULL, 10);
- struct gpm940b0 *gpm940b0 = dev_get_drvdata(dev);
-
- if (reg < 0 || val < 0)
- return -EINVAL;
-
- gpm940b0_write_reg(gpm940b0->spi, reg, val);
- return count;
-}
-
-static DEVICE_ATTR(reg, 0644, NULL, reg_write);
-
-static struct lcd_ops gpm940b0_lcd_ops = {
- .set_power = gpm940b0_set_power,
- .set_contrast = gpm940b0_set_contrast,
- .set_mode = gpm940b0_set_mode,
-};
-
-#if 0
-static struct backlight_ops gpm940b0_bl_ops = {
-/* .get_brightness = gpm940b0_bl_get_brightness,*/
- .update_status = gpm940b0_bl_update_status,
-};
-#endif
-
-static int __devinit gpm940b0_probe(struct spi_device *spi)
-{
- int ret;
- struct gpm940b0 *gpm940b0;
-
- gpm940b0 = kmalloc(sizeof(*gpm940b0), GFP_KERNEL);
-
- spi->bits_per_word = 8;
-
- ret = spi_setup(spi);
- if (ret) {
- dev_err(&spi->dev, "Failed to setup spi\n");
- goto err_free_gpm940b0;
- }
-
- gpm940b0->spi = spi;
-
- gpm940b0->lcd = lcd_device_register("gpm940b0-lcd", &spi->dev, gpm940b0,
- &gpm940b0_lcd_ops);
-
- if (IS_ERR(gpm940b0->lcd)) {
- ret = PTR_ERR(gpm940b0->lcd);
- dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
- goto err_free_gpm940b0;
- }
-
- gpm940b0->lcd->props.max_contrast = 255;
-
-#if 0
- gpm940b0->bl = backlight_device_register("gpm940b0-bl", &spi->dev, gpm940b0,
- &gpm940b0_bl_ops);
-
- if (IS_ERR(gpm940b0->bl)) {
- ret = PTR_ERR(gpm940b0->bl);
- dev_err(&spi->dev, "Failed to register backlight device: %d\n", ret);
- gpm940b0->bl = NULL;
- } else {
- gpm940b0->bl->props.max_brightness = 8;
- gpm940b0->bl->props.brightness = 0;
- gpm940b0->bl->props.power = FB_BLANK_UNBLANK;
- }
-#endif
-
- ret = device_create_file(&spi->dev, &dev_attr_reg);
- if (ret)
- goto err_unregister_lcd;
-
- gpm940b0->enabled = 1;
- dev_set_drvdata(&spi->dev, gpm940b0);
-
- gpm940b0_write_reg(spi, 0x13, 0x01);
- gpm940b0_write_reg(spi, 0x5, 0xc7);
- return 0;
-err_unregister_lcd:
- lcd_device_unregister(gpm940b0->lcd);
-err_free_gpm940b0:
- kfree(gpm940b0);
- return ret;
-}
-
-static int __devexit gpm940b0_remove(struct spi_device *spi)
-{
- struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
-#if 0
- if (gpm940b0->bl)
- backlight_device_unregister(gpm940b0->bl);
-#endif
-
- lcd_device_unregister(gpm940b0->lcd);
-
- spi_set_drvdata(spi, NULL);
- kfree(gpm940b0);
- return 0;
-}
-
-#ifdef CONFIG_PM
-
-static int gpm940b0_suspend(struct spi_device *spi, pm_message_t state)
-{
- struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
- if (gpm940b0->enabled) {
- gpm940b0_power_disable(gpm940b0);
- mdelay(10);
- }
- return 0;
-}
-
-static int gpm940b0_resume(struct spi_device *spi)
-{
- struct gpm940b0 *gpm940b0 = spi_get_drvdata(spi);
- if (gpm940b0->enabled)
- gpm940b0_power_enable(gpm940b0);
- return 0;
-}
-
-#else
-#define gpm940b0_suspend NULL
-#define gpm940b0_resume NULL
-#endif
-
-static struct spi_driver gpm940b0_driver = {
- .driver = {
- .name = "gpm940b0",
- .owner = THIS_MODULE,
- },
- .probe = gpm940b0_probe,
- .remove = __devexit_p(gpm940b0_remove),
- .suspend = gpm940b0_suspend,
- .resume = gpm940b0_resume,
-};
-
-static int __init gpm940b0_init(void)
-{
- return spi_register_driver(&gpm940b0_driver);
-}
-module_init(gpm940b0_init);
-
-static void __exit gpm940b0_exit(void)
-{
- return spi_unregister_driver(&gpm940b0_driver);
-}
-module_exit(gpm940b0_exit)
-
-MODULE_AUTHOR("Lars-Peter Clausen");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("LCD and backlight controll for Giantplus GPM940B0");
-MODULE_ALIAS("spi:gpm940b0");
projects / 10.03 / openwrt.git / blobdiff