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kernel_optimize_test/drivers/video/backlight/lms501kf03.c
Lee Jones 81357f818f backlight: lms501kf03: Remove unused const variables 
W=1 kernel build reports:

 drivers/video/backlight/lms501kf03.c:96:28: warning: ‘seq_sleep_in’ defined but not used [-Wunused-const-variable=]
 96 | static const unsigned char seq_sleep_in[] = {
 | ^~~~~~~~~~~~
 drivers/video/backlight/lms501kf03.c:92:28: warning: ‘seq_up_dn’ defined but not used [-Wunused-const-variable=]
 92 | static const unsigned char seq_up_dn[] = {
 | ^~~~~~~~~

Either 'seq_sleep_in' nor 'seq_up_dn' have been used since the
driver first landed in 2013.

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-07-06 08:11:41 +01:00

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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 int lms501kf03_remove(struct spi_device *spi)
{
struct lms501kf03 *lcd = spi_get_drvdata(spi);
lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
return 0;
}
#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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