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303 lines
6.1 KiB
303 lines
6.1 KiB
/*
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* LCD / Backlight control code for Sharp SL-6000x (tosa)
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*
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* Copyright (c) 2005 Dirk Opfer
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* Copyright (c) 2007,2008 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/spi/spi.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/lcd.h>
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#include <linux/fb.h>
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#include <asm/mach/sharpsl_param.h>
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#include <mach/tosa.h>
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#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
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#define TG_REG0_VQV 0x0001
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#define TG_REG0_COLOR 0x0002
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#define TG_REG0_UD 0x0004
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#define TG_REG0_LR 0x0008
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#define DAC_BASE 0x4e
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struct tosa_lcd_data {
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struct spi_device *spi;
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struct lcd_device *lcd;
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struct i2c_client *i2c;
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int lcd_power;
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bool is_vga;
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};
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static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
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{
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u8 buf[1];
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struct spi_message msg;
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struct spi_transfer xfer = {
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.len = 1,
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.cs_change = 1,
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.tx_buf = buf,
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};
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buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(spi, &msg);
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}
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int tosa_bl_enable(struct spi_device *spi, int enable)
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{
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/* bl_enable GP04=1 otherwise GP04=0*/
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return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
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}
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EXPORT_SYMBOL(tosa_bl_enable);
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static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
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{
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/* TG on */
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gpio_set_value(TOSA_GPIO_TG_ON, 0);
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mdelay(60);
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/* delayed 0clk TCTL signal for VGA */
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tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
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/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
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tosa_tg_send(data->spi, TG_GPOSR, 0x02);
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}
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static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
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{
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struct spi_device *spi = data->spi;
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int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
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if (data->is_vga)
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value |= TG_REG0_VQV;
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tosa_tg_send(spi, TG_PNLCTL, value);
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/* TG LCD pannel power up */
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tosa_tg_send(spi, TG_PINICTL,0x4);
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mdelay(50);
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/* TG LCD GVSS */
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tosa_tg_send(spi, TG_PINICTL,0x0);
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if (!data->i2c) {
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/* after the pannel is powered up the first time, we can access the i2c bus */
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/* so probe for the DAC */
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struct i2c_adapter *adap = i2c_get_adapter(0);
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struct i2c_board_info info = {
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.type = "tosa-bl",
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.addr = DAC_BASE,
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.platform_data = data->spi,
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};
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data->i2c = i2c_new_device(adap, &info);
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}
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}
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static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
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{
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struct spi_device *spi = data->spi;
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/* TG LCD VHSA off */
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tosa_tg_send(spi, TG_PINICTL,0x4);
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mdelay(50);
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/* TG LCD signal off */
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tosa_tg_send(spi, TG_PINICTL,0x6);
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mdelay(50);
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/* TG Off */
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gpio_set_value(TOSA_GPIO_TG_ON, 1);
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mdelay(100);
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}
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int tosa_lcd_set_power(struct lcd_device *lcd, int power)
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{
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struct tosa_lcd_data *data = lcd_get_data(lcd);
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if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
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tosa_lcd_tg_on(data);
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if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
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tosa_lcd_tg_off(data);
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data->lcd_power = power;
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return 0;
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}
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static int tosa_lcd_get_power(struct lcd_device *lcd)
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{
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struct tosa_lcd_data *data = lcd_get_data(lcd);
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return data->lcd_power;
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}
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static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
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{
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struct tosa_lcd_data *data = lcd_get_data(lcd);
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if (mode->xres == 320 || mode->yres == 320)
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data->is_vga = false;
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else
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data->is_vga = true;
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if (POWER_IS_ON(data->lcd_power))
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tosa_lcd_tg_on(data);
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return 0;
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}
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static struct lcd_ops tosa_lcd_ops = {
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.set_power = tosa_lcd_set_power,
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.get_power = tosa_lcd_get_power,
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.set_mode = tosa_lcd_set_mode,
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};
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static int __devinit tosa_lcd_probe(struct spi_device *spi)
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{
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int ret;
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struct tosa_lcd_data *data;
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data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->is_vga = true; /* default to VGA mode */
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/*
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* bits_per_word cannot be configured in platform data
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*/
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spi->bits_per_word = 8;
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ret = spi_setup(spi);
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if (ret < 0)
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goto err_spi;
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data->spi = spi;
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dev_set_drvdata(&spi->dev, data);
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ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
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if (ret < 0)
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goto err_gpio_tg;
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mdelay(60);
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ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
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if (ret < 0)
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goto err_gpio_dir;
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mdelay(60);
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tosa_lcd_tg_init(data);
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tosa_lcd_tg_on(data);
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data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
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&tosa_lcd_ops);
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if (IS_ERR(data->lcd)) {
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ret = PTR_ERR(data->lcd);
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data->lcd = NULL;
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goto err_register;
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}
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return 0;
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err_register:
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tosa_lcd_tg_off(data);
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err_gpio_dir:
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gpio_free(TOSA_GPIO_TG_ON);
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err_gpio_tg:
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dev_set_drvdata(&spi->dev, NULL);
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err_spi:
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kfree(data);
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return ret;
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}
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static int __devexit tosa_lcd_remove(struct spi_device *spi)
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{
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struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
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lcd_device_unregister(data->lcd);
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if (data->i2c)
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i2c_unregister_device(data->i2c);
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tosa_lcd_tg_off(data);
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gpio_free(TOSA_GPIO_TG_ON);
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dev_set_drvdata(&spi->dev, NULL);
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kfree(data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
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{
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struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
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tosa_lcd_tg_off(data);
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return 0;
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}
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static int tosa_lcd_resume(struct spi_device *spi)
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{
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struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
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tosa_lcd_tg_init(data);
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if (POWER_IS_ON(data->lcd_power))
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tosa_lcd_tg_on(data);
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else
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tosa_lcd_tg_off(data);
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return 0;
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}
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#else
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#define tosa_lcd_suspend NULL
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#define tosa_lcd_reume NULL
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#endif
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static struct spi_driver tosa_lcd_driver = {
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.driver = {
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.name = "tosa-lcd",
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.owner = THIS_MODULE,
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},
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.probe = tosa_lcd_probe,
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.remove = __devexit_p(tosa_lcd_remove),
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.suspend = tosa_lcd_suspend,
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.resume = tosa_lcd_resume,
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};
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static int __init tosa_lcd_init(void)
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{
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return spi_register_driver(&tosa_lcd_driver);
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}
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static void __exit tosa_lcd_exit(void)
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{
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spi_unregister_driver(&tosa_lcd_driver);
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}
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module_init(tosa_lcd_init);
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module_exit(tosa_lcd_exit);
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MODULE_AUTHOR("Dmitry Baryshkov");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
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MODULE_ALIAS("spi:tosa-lcd");
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