korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-06 18:44:19 +08:00
Code Issues Packages Projects Releases Wiki Activity
ccf9901ffe
linux/drivers/video/backlight/hx8357.c
Maxime Ripard ccf9901ffe video: hx8357: Make IM pins optional 
The IM pins of the HX8357 controller are used to define the interface
used to feed pixel stream to the LCD panel.

Most of the time, these pins are directly routed to either the ground or
the VCC to set their values.

Remove the need to assign GPIOs to these pins when we are in such a case.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2013-08-02 13:15:07 +03:00

508 lines
12 KiB
C
Raw Blame History

/*
* 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;
bool use_im_pins;
};
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
*/
if (lcd->use_im_pins) {
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;
}
if (of_find_property(spi->dev.of_node, "im-gpios", NULL)) {
lcd->use_im_pins = 1;
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;
}
}
} else {
lcd->use_im_pins = 0;
}
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");
Reference in New Issue View Git Blame Copy Permalink