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linux/drivers/video/backlight/lms501kf03.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

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lms501kf03 TFT LCD panel driver.
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <jg1.han@samsung.com>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>
#define COMMAND_ONLY 0x00
#define DATA_ONLY 0x01
struct lms501kf03 {
struct device *dev;
struct spi_device *spi;
unsigned int power;
struct lcd_device *ld;
struct lcd_platform_data *lcd_pd;
};
static const unsigned char seq_password[] = {
0xb9, 0xff, 0x83, 0x69,
};
static const unsigned char seq_power[] = {
0xb1, 0x01, 0x00, 0x34, 0x06, 0x00, 0x14, 0x14, 0x20, 0x28,
0x12, 0x12, 0x17, 0x0a, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
};
static const unsigned char seq_display[] = {
0xb2, 0x00, 0x2b, 0x03, 0x03, 0x70, 0x00, 0xff, 0x00, 0x00,
0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
};
static const unsigned char seq_rgb_if[] = {
0xb3, 0x09,
};
static const unsigned char seq_display_inv[] = {
0xb4, 0x01, 0x08, 0x77, 0x0e, 0x06,
};
static const unsigned char seq_vcom[] = {
0xb6, 0x4c, 0x2e,
};
static const unsigned char seq_gate[] = {
0xd5, 0x00, 0x05, 0x03, 0x29, 0x01, 0x07, 0x17, 0x68, 0x13,
0x37, 0x20, 0x31, 0x8a, 0x46, 0x9b, 0x57, 0x13, 0x02, 0x75,
0xb9, 0x64, 0xa8, 0x07, 0x0f, 0x04, 0x07,
};
static const unsigned char seq_panel[] = {
0xcc, 0x02,
};
static const unsigned char seq_col_mod[] = {
0x3a, 0x77,
};
static const unsigned char seq_w_gamma[] = {
0xe0, 0x00, 0x04, 0x09, 0x0f, 0x1f, 0x3f, 0x1f, 0x2f, 0x0a,
0x0f, 0x10, 0x16, 0x18, 0x16, 0x17, 0x0d, 0x15, 0x00, 0x04,
0x09, 0x0f, 0x38, 0x3f, 0x20, 0x39, 0x0a, 0x0f, 0x10, 0x16,
0x18, 0x16, 0x17, 0x0d, 0x15,
};
static const unsigned char seq_rgb_gamma[] = {
0xc1, 0x01, 0x03, 0x07, 0x0f, 0x1a, 0x22, 0x2c, 0x33, 0x3c,
0x46, 0x4f, 0x58, 0x60, 0x69, 0x71, 0x79, 0x82, 0x89, 0x92,
0x9a, 0xa1, 0xa9, 0xb1, 0xb9, 0xc1, 0xc9, 0xcf, 0xd6, 0xde,
0xe5, 0xec, 0xf3, 0xf9, 0xff, 0xdd, 0x39, 0x07, 0x1c, 0xcb,
0xab, 0x5f, 0x49, 0x80, 0x03, 0x07, 0x0f, 0x19, 0x20, 0x2a,
0x31, 0x39, 0x42, 0x4b, 0x53, 0x5b, 0x63, 0x6b, 0x73, 0x7b,
0x83, 0x8a, 0x92, 0x9b, 0xa2, 0xaa, 0xb2, 0xba, 0xc2, 0xca,
0xd0, 0xd8, 0xe1, 0xe8, 0xf0, 0xf8, 0xff, 0xf7, 0xd8, 0xbe,
0xa7, 0x39, 0x40, 0x85, 0x8c, 0xc0, 0x04, 0x07, 0x0c, 0x17,
0x1c, 0x23, 0x2b, 0x34, 0x3b, 0x43, 0x4c, 0x54, 0x5b, 0x63,
0x6a, 0x73, 0x7a, 0x82, 0x8a, 0x91, 0x98, 0xa1, 0xa8, 0xb0,
0xb7, 0xc1, 0xc9, 0xcf, 0xd9, 0xe3, 0xea, 0xf4, 0xff, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const unsigned char seq_sleep_out[] = {
0x11,
};
static const unsigned char seq_display_on[] = {
0x29,
};
static const unsigned char seq_display_off[] = {
0x10,
};
static int lms501kf03_spi_write_byte(struct lms501kf03 *lcd, int addr, int data)
{
u16 buf[1];
struct spi_message msg;
struct spi_transfer xfer = {
.len = 2,
.tx_buf = buf,
};
buf[0] = (addr << 8) | data;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(lcd->spi, &msg);
}
static int lms501kf03_spi_write(struct lms501kf03 *lcd, unsigned char address,
unsigned char command)
{
return lms501kf03_spi_write_byte(lcd, address, command);
}
static int lms501kf03_panel_send_sequence(struct lms501kf03 *lcd,
const unsigned char *wbuf,
unsigned int len)
{
int ret = 0, i = 0;
while (i < len) {
if (i == 0)
ret = lms501kf03_spi_write(lcd, COMMAND_ONLY, wbuf[i]);
else
ret = lms501kf03_spi_write(lcd, DATA_ONLY, wbuf[i]);
if (ret)
break;
i += 1;
}
return ret;
}
static int lms501kf03_ldi_init(struct lms501kf03 *lcd)
{
int ret, i;
static const unsigned char *init_seq[] = {
seq_password,
seq_power,
seq_display,
seq_rgb_if,
seq_display_inv,
seq_vcom,
seq_gate,
seq_panel,
seq_col_mod,
seq_w_gamma,
seq_rgb_gamma,
seq_sleep_out,
};
static const unsigned int size_seq[] = {
ARRAY_SIZE(seq_password),
ARRAY_SIZE(seq_power),
ARRAY_SIZE(seq_display),
ARRAY_SIZE(seq_rgb_if),
ARRAY_SIZE(seq_display_inv),
ARRAY_SIZE(seq_vcom),
ARRAY_SIZE(seq_gate),
ARRAY_SIZE(seq_panel),
ARRAY_SIZE(seq_col_mod),
ARRAY_SIZE(seq_w_gamma),
ARRAY_SIZE(seq_rgb_gamma),
ARRAY_SIZE(seq_sleep_out),
};
for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
ret = lms501kf03_panel_send_sequence(lcd, init_seq[i],
size_seq[i]);
if (ret)
break;
}
/*
* According to the datasheet, 120ms delay time is required.
* After sleep out sequence, command is blocked for 120ms.
* Thus, LDI should wait for 120ms.
*/
msleep(120);
return ret;
}
static int lms501kf03_ldi_enable(struct lms501kf03 *lcd)
{
return lms501kf03_panel_send_sequence(lcd, seq_display_on,
ARRAY_SIZE(seq_display_on));
}
static int lms501kf03_ldi_disable(struct lms501kf03 *lcd)
{
return lms501kf03_panel_send_sequence(lcd, seq_display_off,
ARRAY_SIZE(seq_display_off));
}
static int lms501kf03_power_is_on(int power)
{
return (power) <= FB_BLANK_NORMAL;
}
static int lms501kf03_power_on(struct lms501kf03 *lcd)
{
int ret = 0;
struct lcd_platform_data *pd;
pd = lcd->lcd_pd;
if (!pd->power_on) {
dev_err(lcd->dev, "power_on is NULL.\n");
return -EINVAL;
}
pd->power_on(lcd->ld, 1);
msleep(pd->power_on_delay);
if (!pd->reset) {
dev_err(lcd->dev, "reset is NULL.\n");
return -EINVAL;
}
pd->reset(lcd->ld);
msleep(pd->reset_delay);
ret = lms501kf03_ldi_init(lcd);
if (ret) {
dev_err(lcd->dev, "failed to initialize ldi.\n");
return ret;
}
ret = lms501kf03_ldi_enable(lcd);
if (ret) {
dev_err(lcd->dev, "failed to enable ldi.\n");
return ret;
}
return 0;
}
static int lms501kf03_power_off(struct lms501kf03 *lcd)
{
int ret = 0;
struct lcd_platform_data *pd;
pd = lcd->lcd_pd;
ret = lms501kf03_ldi_disable(lcd);
if (ret) {
dev_err(lcd->dev, "lcd setting failed.\n");
return -EIO;
}
msleep(pd->power_off_delay);
pd->power_on(lcd->ld, 0);
return 0;
}
static int lms501kf03_power(struct lms501kf03 *lcd, int power)
{
int ret = 0;
if (lms501kf03_power_is_on(power) &&
!lms501kf03_power_is_on(lcd->power))
ret = lms501kf03_power_on(lcd);
else if (!lms501kf03_power_is_on(power) &&
lms501kf03_power_is_on(lcd->power))
ret = lms501kf03_power_off(lcd);
if (!ret)
lcd->power = power;
return ret;
}
static int lms501kf03_get_power(struct lcd_device *ld)
{
struct lms501kf03 *lcd = lcd_get_data(ld);
return lcd->power;
}
static int lms501kf03_set_power(struct lcd_device *ld, int power)
{
struct lms501kf03 *lcd = lcd_get_data(ld);
if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
power != FB_BLANK_NORMAL) {
dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
return -EINVAL;
}
return lms501kf03_power(lcd, power);
}
static struct lcd_ops lms501kf03_lcd_ops = {
.get_power = lms501kf03_get_power,
.set_power = lms501kf03_set_power,
};
static int lms501kf03_probe(struct spi_device *spi)
{
struct lms501kf03 *lcd = NULL;
struct lcd_device *ld = NULL;
int ret = 0;
lcd = devm_kzalloc(&spi->dev, sizeof(struct lms501kf03), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
/* lms501kf03 lcd panel uses 3-wire 9-bit SPI Mode. */
spi->bits_per_word = 9;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "spi setup failed.\n");
return ret;
}
lcd->spi = spi;
lcd->dev = &spi->dev;
lcd->lcd_pd = dev_get_platdata(&spi->dev);
if (!lcd->lcd_pd) {
dev_err(&spi->dev, "platform data is NULL\n");
return -EINVAL;
}
ld = devm_lcd_device_register(&spi->dev, "lms501kf03", &spi->dev, lcd,
&lms501kf03_lcd_ops);
if (IS_ERR(ld))
return PTR_ERR(ld);
lcd->ld = ld;
if (!lcd->lcd_pd->lcd_enabled) {
/*
* if lcd panel was off from bootloader then
* current lcd status is powerdown and then
* it enables lcd panel.
*/
lcd->power = FB_BLANK_POWERDOWN;
lms501kf03_power(lcd, FB_BLANK_UNBLANK);
} else {
lcd->power = FB_BLANK_UNBLANK;
}
spi_set_drvdata(spi, lcd);
dev_info(&spi->dev, "lms501kf03 panel driver has been probed.\n");
return 0;
}
static void lms501kf03_remove(struct spi_device *spi)
{
struct lms501kf03 *lcd = spi_get_drvdata(spi);
lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
}
#ifdef CONFIG_PM_SLEEP
static int lms501kf03_suspend(struct device *dev)
{
struct lms501kf03 *lcd = dev_get_drvdata(dev);
dev_dbg(dev, "lcd->power = %d\n", lcd->power);
/*
* when lcd panel is suspend, lcd panel becomes off
* regardless of status.
*/
return lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
}
static int lms501kf03_resume(struct device *dev)
{
struct lms501kf03 *lcd = dev_get_drvdata(dev);
lcd->power = FB_BLANK_POWERDOWN;
return lms501kf03_power(lcd, FB_BLANK_UNBLANK);
}
#endif
static SIMPLE_DEV_PM_OPS(lms501kf03_pm_ops, lms501kf03_suspend,
lms501kf03_resume);
static void lms501kf03_shutdown(struct spi_device *spi)
{
struct lms501kf03 *lcd = spi_get_drvdata(spi);
lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
}
static struct spi_driver lms501kf03_driver = {
.driver = {
.name = "lms501kf03",
.pm = &lms501kf03_pm_ops,
},
.probe = lms501kf03_probe,
.remove = lms501kf03_remove,
.shutdown = lms501kf03_shutdown,
};
module_spi_driver(lms501kf03_driver);
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("lms501kf03 LCD Driver");
MODULE_LICENSE("GPL");
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