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linux/drivers/video/backlight/hx8357.c

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/*
* Driver for the Himax HX-8357 LCD Controller
*
* Copyright 2012 Free Electrons
*
* Licensed under the GPLv2 or later.
*/
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#define HX8357_NUM_IM_PINS 3
#define HX8357_SWRESET 0x01
#define HX8357_GET_RED_CHANNEL 0x06
#define HX8357_GET_GREEN_CHANNEL 0x07
#define HX8357_GET_BLUE_CHANNEL 0x08
#define HX8357_GET_POWER_MODE 0x0a
#define HX8357_GET_MADCTL 0x0b
#define HX8357_GET_PIXEL_FORMAT 0x0c
#define HX8357_GET_DISPLAY_MODE 0x0d
#define HX8357_GET_SIGNAL_MODE 0x0e
#define HX8357_GET_DIAGNOSTIC_RESULT 0x0f
#define HX8357_ENTER_SLEEP_MODE 0x10
#define HX8357_EXIT_SLEEP_MODE 0x11
#define HX8357_ENTER_PARTIAL_MODE 0x12
#define HX8357_ENTER_NORMAL_MODE 0x13
#define HX8357_EXIT_INVERSION_MODE 0x20
#define HX8357_ENTER_INVERSION_MODE 0x21
#define HX8357_SET_DISPLAY_OFF 0x28
#define HX8357_SET_DISPLAY_ON 0x29
#define HX8357_SET_COLUMN_ADDRESS 0x2a
#define HX8357_SET_PAGE_ADDRESS 0x2b
#define HX8357_WRITE_MEMORY_START 0x2c
#define HX8357_READ_MEMORY_START 0x2e
#define HX8357_SET_PARTIAL_AREA 0x30
#define HX8357_SET_SCROLL_AREA 0x33
#define HX8357_SET_TEAR_OFF 0x34
#define HX8357_SET_TEAR_ON 0x35
#define HX8357_SET_ADDRESS_MODE 0x36
#define HX8357_SET_SCROLL_START 0x37
#define HX8357_EXIT_IDLE_MODE 0x38
#define HX8357_ENTER_IDLE_MODE 0x39
#define HX8357_SET_PIXEL_FORMAT 0x3a
#define HX8357_SET_PIXEL_FORMAT_DBI_3BIT (0x1)
#define HX8357_SET_PIXEL_FORMAT_DBI_16BIT (0x5)
#define HX8357_SET_PIXEL_FORMAT_DBI_18BIT (0x6)
#define HX8357_SET_PIXEL_FORMAT_DPI_3BIT (0x1 << 4)
#define HX8357_SET_PIXEL_FORMAT_DPI_16BIT (0x5 << 4)
#define HX8357_SET_PIXEL_FORMAT_DPI_18BIT (0x6 << 4)
#define HX8357_WRITE_MEMORY_CONTINUE 0x3c
#define HX8357_READ_MEMORY_CONTINUE 0x3e
#define HX8357_SET_TEAR_SCAN_LINES 0x44
#define HX8357_GET_SCAN_LINES 0x45
#define HX8357_READ_DDB_START 0xa1
#define HX8357_SET_DISPLAY_MODE 0xb4
#define HX8357_SET_DISPLAY_MODE_RGB_THROUGH (0x3)
#define HX8357_SET_DISPLAY_MODE_RGB_INTERFACE (1 << 4)
#define HX8357_SET_PANEL_DRIVING 0xc0
#define HX8357_SET_DISPLAY_FRAME 0xc5
#define HX8357_SET_RGB 0xc6
#define HX8357_SET_RGB_ENABLE_HIGH (1 << 1)
#define HX8357_SET_GAMMA 0xc8
#define HX8357_SET_POWER 0xd0
#define HX8357_SET_VCOM 0xd1
#define HX8357_SET_POWER_NORMAL 0xd2
#define HX8357_SET_PANEL_RELATED 0xe9
struct hx8357_data {
unsigned im_pins[HX8357_NUM_IM_PINS];
unsigned reset;
struct spi_device *spi;
int state;
};
static u8 hx8357_seq_power[] = {
HX8357_SET_POWER, 0x44, 0x41, 0x06,
};
static u8 hx8357_seq_vcom[] = {
HX8357_SET_VCOM, 0x40, 0x10,
};
static u8 hx8357_seq_power_normal[] = {
HX8357_SET_POWER_NORMAL, 0x05, 0x12,
};
static u8 hx8357_seq_panel_driving[] = {
HX8357_SET_PANEL_DRIVING, 0x14, 0x3b, 0x00, 0x02, 0x11,
};
static u8 hx8357_seq_display_frame[] = {
HX8357_SET_DISPLAY_FRAME, 0x0c,
};
static u8 hx8357_seq_panel_related[] = {
HX8357_SET_PANEL_RELATED, 0x01,
};
static u8 hx8357_seq_undefined1[] = {
0xea, 0x03, 0x00, 0x00,
};
static u8 hx8357_seq_undefined2[] = {
0xeb, 0x40, 0x54, 0x26, 0xdb,
};
static u8 hx8357_seq_gamma[] = {
HX8357_SET_GAMMA, 0x00, 0x15, 0x00, 0x22, 0x00,
0x08, 0x77, 0x26, 0x77, 0x22, 0x04, 0x00,
};
static u8 hx8357_seq_address_mode[] = {
HX8357_SET_ADDRESS_MODE, 0xc0,
};
static u8 hx8357_seq_pixel_format[] = {
HX8357_SET_PIXEL_FORMAT,
HX8357_SET_PIXEL_FORMAT_DPI_18BIT |
HX8357_SET_PIXEL_FORMAT_DBI_18BIT,
};
static u8 hx8357_seq_column_address[] = {
HX8357_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0x3f,
};
static u8 hx8357_seq_page_address[] = {
HX8357_SET_PAGE_ADDRESS, 0x00, 0x00, 0x01, 0xdf,
};
static u8 hx8357_seq_rgb[] = {
HX8357_SET_RGB, 0x02,
};
static u8 hx8357_seq_display_mode[] = {
HX8357_SET_DISPLAY_MODE,
HX8357_SET_DISPLAY_MODE_RGB_THROUGH |
HX8357_SET_DISPLAY_MODE_RGB_INTERFACE,
};
static int hx8357_spi_write_then_read(struct lcd_device *lcdev,
u8 *txbuf, u16 txlen,
u8 *rxbuf, u16 rxlen)
{
struct hx8357_data *lcd = lcd_get_data(lcdev);
struct spi_message msg;
struct spi_transfer xfer[2];
u16 *local_txbuf = NULL;
int ret = 0;
memset(xfer, 0, sizeof(xfer));
spi_message_init(&msg);
if (txlen) {
int i;
local_txbuf = kcalloc(txlen, sizeof(*local_txbuf), GFP_KERNEL);
if (!local_txbuf)
return -ENOMEM;
for (i = 0; i < txlen; i++) {
local_txbuf[i] = txbuf[i];
if (i > 0)
local_txbuf[i] |= 1 << 8;
}
xfer[0].len = 2 * txlen;
xfer[0].bits_per_word = 9;
xfer[0].tx_buf = local_txbuf;
spi_message_add_tail(&xfer[0], &msg);
}
if (rxlen) {
xfer[1].len = rxlen;
xfer[1].bits_per_word = 8;
xfer[1].rx_buf = rxbuf;
spi_message_add_tail(&xfer[1], &msg);
}
ret = spi_sync(lcd->spi, &msg);
if (ret < 0)
dev_err(&lcdev->dev, "Couldn't send SPI data\n");
if (txlen)
kfree(local_txbuf);
return ret;
}
static inline int hx8357_spi_write_array(struct lcd_device *lcdev,
u8 *value, u8 len)
{
return hx8357_spi_write_then_read(lcdev, value, len, NULL, 0);
}
static inline int hx8357_spi_write_byte(struct lcd_device *lcdev,
u8 value)
{
return hx8357_spi_write_then_read(lcdev, &value, 1, NULL, 0);
}
static int hx8357_enter_standby(struct lcd_device *lcdev)
{
int ret;
ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_OFF);
if (ret < 0)
return ret;
usleep_range(10000, 12000);
ret = hx8357_spi_write_byte(lcdev, HX8357_ENTER_SLEEP_MODE);
if (ret < 0)
return ret;
msleep(120);
return 0;
}
static int hx8357_exit_standby(struct lcd_device *lcdev)
{
int ret;
ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
if (ret < 0)
return ret;
msleep(120);
ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_ON);
if (ret < 0)
return ret;
return 0;
}
static int hx8357_lcd_init(struct lcd_device *lcdev)
{
struct hx8357_data *lcd = lcd_get_data(lcdev);
int ret;
/*
* Set the interface selection pins to SPI mode, with three
* wires
*/
gpio_set_value_cansleep(lcd->im_pins[0], 1);
gpio_set_value_cansleep(lcd->im_pins[1], 0);
gpio_set_value_cansleep(lcd->im_pins[2], 1);
/* Reset the screen */
gpio_set_value(lcd->reset, 1);
usleep_range(10000, 12000);
gpio_set_value(lcd->reset, 0);
usleep_range(10000, 12000);
gpio_set_value(lcd->reset, 1);
msleep(120);
ret = hx8357_spi_write_array(lcdev, hx8357_seq_power,
ARRAY_SIZE(hx8357_seq_power));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_vcom,
ARRAY_SIZE(hx8357_seq_vcom));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_power_normal,
ARRAY_SIZE(hx8357_seq_power_normal));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_panel_driving,
ARRAY_SIZE(hx8357_seq_panel_driving));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_display_frame,
ARRAY_SIZE(hx8357_seq_display_frame));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_panel_related,
ARRAY_SIZE(hx8357_seq_panel_related));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_undefined1,
ARRAY_SIZE(hx8357_seq_undefined1));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_undefined2,
ARRAY_SIZE(hx8357_seq_undefined2));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_gamma,
ARRAY_SIZE(hx8357_seq_gamma));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_address_mode,
ARRAY_SIZE(hx8357_seq_address_mode));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_pixel_format,
ARRAY_SIZE(hx8357_seq_pixel_format));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_column_address,
ARRAY_SIZE(hx8357_seq_column_address));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_page_address,
ARRAY_SIZE(hx8357_seq_page_address));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_rgb,
ARRAY_SIZE(hx8357_seq_rgb));
if (ret < 0)
return ret;
ret = hx8357_spi_write_array(lcdev, hx8357_seq_display_mode,
ARRAY_SIZE(hx8357_seq_display_mode));
if (ret < 0)
return ret;
ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
if (ret < 0)
return ret;
msleep(120);
ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_ON);
if (ret < 0)
return ret;
usleep_range(5000, 7000);
ret = hx8357_spi_write_byte(lcdev, HX8357_WRITE_MEMORY_START);
if (ret < 0)
return ret;
return 0;
}
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
static int hx8357_set_power(struct lcd_device *lcdev, int power)
{
struct hx8357_data *lcd = lcd_get_data(lcdev);
int ret = 0;
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->state))
ret = hx8357_exit_standby(lcdev);
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->state))
ret = hx8357_enter_standby(lcdev);
if (ret == 0)
lcd->state = power;
else
dev_warn(&lcdev->dev, "failed to set power mode %d\n", power);
return ret;
}
static int hx8357_get_power(struct lcd_device *lcdev)
{
struct hx8357_data *lcd = lcd_get_data(lcdev);
return lcd->state;
}
static struct lcd_ops hx8357_ops = {
.set_power = hx8357_set_power,
.get_power = hx8357_get_power,
};
static int hx8357_probe(struct spi_device *spi)
{
struct lcd_device *lcdev;
struct hx8357_data *lcd;
int i, ret;
lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd) {
dev_err(&spi->dev, "Couldn't allocate lcd internal structure!\n");
return -ENOMEM;
}
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "SPI setup failed.\n");
return ret;
}
lcd->spi = spi;
lcd->reset = of_get_named_gpio(spi->dev.of_node, "gpios-reset", 0);
if (!gpio_is_valid(lcd->reset)) {
dev_err(&spi->dev, "Missing dt property: gpios-reset\n");
return -EINVAL;
}
ret = devm_gpio_request_one(&spi->dev, lcd->reset,
GPIOF_OUT_INIT_HIGH,
"hx8357-reset");
if (ret) {
dev_err(&spi->dev,
"failed to request gpio %d: %d\n",
lcd->reset, ret);
return -EINVAL;
}
for (i = 0; i < HX8357_NUM_IM_PINS; i++) {
lcd->im_pins[i] = of_get_named_gpio(spi->dev.of_node,
"im-gpios", i);
if (lcd->im_pins[i] == -EPROBE_DEFER) {
dev_info(&spi->dev, "GPIO requested is not here yet, deferring the probe\n");
return -EPROBE_DEFER;
}
if (!gpio_is_valid(lcd->im_pins[i])) {
dev_err(&spi->dev, "Missing dt property: im-gpios\n");
return -EINVAL;
}
ret = devm_gpio_request_one(&spi->dev, lcd->im_pins[i],
GPIOF_OUT_INIT_LOW, "im_pins");
if (ret) {
dev_err(&spi->dev, "failed to request gpio %d: %d\n",
lcd->im_pins[i], ret);
return -EINVAL;
}
}
lcdev = lcd_device_register("mxsfb", &spi->dev, lcd, &hx8357_ops);
if (IS_ERR(lcdev)) {
ret = PTR_ERR(lcdev);
return ret;
}
spi_set_drvdata(spi, lcdev);
ret = hx8357_lcd_init(lcdev);
if (ret) {
dev_err(&spi->dev, "Couldn't initialize panel\n");
goto init_error;
}
dev_info(&spi->dev, "Panel probed\n");
return 0;
init_error:
lcd_device_unregister(lcdev);
return ret;
}
static int hx8357_remove(struct spi_device *spi)
{
struct lcd_device *lcdev = spi_get_drvdata(spi);
lcd_device_unregister(lcdev);
return 0;
}
static const struct of_device_id hx8357_dt_ids[] = {
{ .compatible = "himax,hx8357" },
{},
};
MODULE_DEVICE_TABLE(of, hx8357_dt_ids);
static struct spi_driver hx8357_driver = {
.probe = hx8357_probe,
.remove = hx8357_remove,
.driver = {
.name = "hx8357",
.of_match_table = of_match_ptr(hx8357_dt_ids),
},
};
module_spi_driver(hx8357_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Himax HX-8357 LCD Driver");
MODULE_LICENSE("GPL");
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