diff options
Diffstat (limited to 'drivers/video/backlight/tosa_lcd.c')
| -rw-r--r-- | drivers/video/backlight/tosa_lcd.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/video/backlight/tosa_lcd.c b/drivers/video/backlight/tosa_lcd.c new file mode 100644 index 000000000..387655443 --- /dev/null +++ b/drivers/video/backlight/tosa_lcd.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * LCD / Backlight control code for Sharp SL-6000x (tosa) + * + * Copyright (c) 2005 Dirk Opfer + * Copyright (c) 2007,2008 Dmitry Baryshkov + */ + +#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/consumer.h> +#include <linux/delay.h> +#include <linux/lcd.h> +#include <linux/fb.h> + +#include <asm/mach/sharpsl_param.h> + +#include "tosa_bl.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 + +/* + * Timing Generator + */ +#define TG_PNLCTL 0x00 +#define TG_TPOSCTL 0x01 +#define TG_DUTYCTL 0x02 +#define TG_GPOSR 0x03 +#define TG_GPODR1 0x04 +#define TG_GPODR2 0x05 +#define TG_PINICTL 0x06 +#define TG_HPOSCTL 0x07 + + +#define DAC_BASE 0x4e + +struct tosa_lcd_data { + struct spi_device *spi; + struct lcd_device *lcd; + struct i2c_client *i2c; + struct gpio_desc *gpiod_tg; + + 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 = 0, + .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 */ + gpiod_set_value(data->gpiod_tg, 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 (IS_ERR_OR_NULL(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 = { + .dev_name = "tosa-bl", + .type = "tosa-bl", + .addr = DAC_BASE, + .platform_data = data->spi, + }; + data->i2c = i2c_new_client_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 */ + gpiod_set_value(data->gpiod_tg, 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 tosa_lcd_probe(struct spi_device *spi) +{ + int ret; + struct tosa_lcd_data *data; + + data = devm_kzalloc(&spi->dev, 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) + return ret; + + data->spi = spi; + spi_set_drvdata(spi, data); + + data->gpiod_tg = devm_gpiod_get(&spi->dev, "tg #pwr", GPIOD_OUT_LOW); + if (IS_ERR(data->gpiod_tg)) + return PTR_ERR(data->gpiod_tg); + + mdelay(60); + + tosa_lcd_tg_init(data); + + tosa_lcd_tg_on(data); + + data->lcd = devm_lcd_device_register(&spi->dev, "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); + return ret; +} + +static int tosa_lcd_remove(struct spi_device *spi) +{ + struct tosa_lcd_data *data = spi_get_drvdata(spi); + + i2c_unregister_device(data->i2c); + + tosa_lcd_tg_off(data); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tosa_lcd_suspend(struct device *dev) +{ + struct tosa_lcd_data *data = dev_get_drvdata(dev); + + tosa_lcd_tg_off(data); + + return 0; +} + +static int tosa_lcd_resume(struct device *dev) +{ + struct tosa_lcd_data *data = dev_get_drvdata(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; +} +#endif + +static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume); + +static struct spi_driver tosa_lcd_driver = { + .driver = { + .name = "tosa-lcd", + .pm = &tosa_lcd_pm_ops, + }, + .probe = tosa_lcd_probe, + .remove = tosa_lcd_remove, +}; + +module_spi_driver(tosa_lcd_driver); + +MODULE_AUTHOR("Dmitry Baryshkov"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); +MODULE_ALIAS("spi:tosa-lcd"); |