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