linux/drivers/video/backlight/tosa_lcd.c
Uwe Kleine-König a0386bba70
spi: make remove callback a void function
The value returned by an spi driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Claudius Heine <ch@denx.de>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Łukasz Stelmach <l.stelmach@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-02-09 13:00:45 +00:00

285 lines
5.7 KiB
C

// 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 void 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);
}
#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");