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alistair23-linux/drivers/video/backlight/lms501kf03.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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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/gpio.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_up_dn[] = {
0x36, 0x10,
};
static const unsigned char seq_sleep_in[] = {
0x10,
};
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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