[PATCH 1/3] fb: backlight: Add the Himax HX-8357B LCD controller
Jingoo Han
jg1.han at samsung.com
Wed Jan 23 12:51:22 EST 2013
On Wednesday, January 23, 2013 1:23 AM, Maxime Ripard wrote
>
> Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> ---
> drivers/video/backlight/Kconfig | 7 +
> drivers/video/backlight/Makefile | 1 +
> drivers/video/backlight/hx8357.c | 482 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 490 insertions(+)
> create mode 100644 drivers/video/backlight/hx8357.c
>
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 765a945..c39bed0 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -126,6 +126,13 @@ config LCD_AMS369FG06
> If you have an AMS369FG06 AMOLED Panel, say Y to enable its
> LCD control driver.
>
> +config LCD_HX8357
> + tristate "Himax HX-8357 LCD Driver"
> + depends on SPI
> + help
> + If you have a HX-8357 LCD panel, say Y to enable its LCD control
> + driver.
> +
> endif # LCD_CLASS_DEVICE
>
> #
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index e7ce729..b69d391 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
> obj-$(CONFIG_LCD_S6E63M0) += s6e63m0.o
> obj-$(CONFIG_LCD_LD9040) += ld9040.o
> obj-$(CONFIG_LCD_AMS369FG06) += ams369fg06.o
> +obj-$(CONFIG_LCD_HX8357) += hx8357.o
>
> obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
> obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
> diff --git a/drivers/video/backlight/hx8357.c b/drivers/video/backlight/hx8357.c
> new file mode 100644
> index 0000000..ee4d607
> --- /dev/null
> +++ b/drivers/video/backlight/hx8357.c
> @@ -0,0 +1,482 @@
> +/*
> + * 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_MOD 0x39
Please change MOD to MODE as below :-)
HX8357_ENTER_IDLE_MODE
> +#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 int hx8357_spi_write_then_read(struct lcd_device *lcdev,
> + void *txbuf, u16 txlen,
> + void *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(sizeof(*local_txbuf), txlen, GFP_KERNEL);
> +
> + if (!local_txbuf) {
> + dev_err(&lcdev->dev, "Couldn't allocate data buffer.\n");
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < txlen; i++) {
> + local_txbuf[i] = ((u8 *)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);
> + u8 buf[16];
> + 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);
> +
> + buf[0] = HX8357_SET_POWER;
> + buf[1] = 0x44;
> + buf[2] = 0x41;
> + buf[3] = 0x06;
> + ret = hx8357_spi_write_array(lcdev, buf, 4);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_VCOM;
> + buf[1] = 0x40;
> + buf[2] = 0x10;
> + ret = hx8357_spi_write_array(lcdev, buf, 3);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_POWER_NORMAL;
> + buf[1] = 0x05;
> + buf[2] = 0x12;
> + ret = hx8357_spi_write_array(lcdev, buf, 3);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_PANEL_DRIVING;
> + buf[1] = 0x14;
> + buf[2] = 0x3b;
> + buf[3] = 0x00;
> + buf[4] = 0x02;
> + buf[5] = 0x11;
> + ret = hx8357_spi_write_array(lcdev, buf, 6);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_DISPLAY_FRAME;
> + buf[1] = 0x0c;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_PANEL_RELATED;
> + buf[1] = 0x01;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = 0xea;
> + buf[1] = 0x03;
> + buf[2] = 0x00;
> + buf[3] = 0x00;
> + ret = hx8357_spi_write_array(lcdev, buf, 4);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = 0xeb;
> + buf[1] = 0x40;
> + buf[2] = 0x54;
> + buf[3] = 0x26;
> + buf[4] = 0xdb;
> + ret = hx8357_spi_write_array(lcdev, buf, 5);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_GAMMA;
> + buf[1] = 0x00;
> + buf[2] = 0x15;
> + buf[3] = 0x00;
> + buf[4] = 0x22;
> + buf[5] = 0x00;
> + buf[6] = 0x08;
> + buf[7] = 0x77;
> + buf[8] = 0x26;
> + buf[9] = 0x77;
> + buf[10] = 0x22;
> + buf[11] = 0x04;
> + buf[12] = 0x00;
> + ret = hx8357_spi_write_array(lcdev, buf, 13);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_ADDRESS_MODE;
> + buf[1] = 0xc0;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_PIXEL_FORMAT;
> + buf[1] = HX8357_SET_PIXEL_FORMAT_DPI_18BIT |
> + HX8357_SET_PIXEL_FORMAT_DBI_18BIT;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_COLUMN_ADDRESS;
> + buf[1] = 0x00;
> + buf[2] = 0x00;
> + buf[3] = 0x01;
> + buf[4] = 0x3f;
> + ret = hx8357_spi_write_array(lcdev, buf, 5);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_PAGE_ADDRESS;
> + buf[1] = 0x00;
> + buf[2] = 0x00;
> + buf[3] = 0x01;
> + buf[4] = 0xdf;
> + ret = hx8357_spi_write_array(lcdev, buf, 5);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_RGB;
> + buf[1] = 0x02;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + if (ret < 0)
> + return ret;
> +
> + buf[0] = HX8357_SET_DISPLAY_MODE;
> + buf[1] = HX8357_SET_DISPLAY_MODE_RGB_THROUGH |
> + HX8357_SET_DISPLAY_MODE_RGB_INTERFACE;
> + ret = hx8357_spi_write_array(lcdev, buf, 2);
> + 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 __devinit hx8357_probe(struct spi_device *spi)
Please remove '__devexit', because it is useless.
Also, it makes build error.
(http://comments.gmane.org/gmane.linux.kernel/1395773)
> +{
> + 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_DIR_OUT, "im_pins");
Please replace GPIOF_DIR_OUT with GPIOF_OUT_INIT_LOW.
If you want to set Low value, please use GPIOF_OUT_INIT_LOW.
> + 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 __devexit hx8357_remove(struct spi_device *spi)
Please remove '__devexit'.
> +{
> + 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 = __devexit_p(hx8357_remove),
Please remove '__devexit_p'.
> + .driver = {
> + .name = "hx8357",
> + .of_match_table = of_match_ptr(hx8357_dt_ids),
> + },
> +};
> +
> +module_spi_driver(hx8357_driver);
> +
> +MODULE_AUTHOR("Maxime Ripard <maxime.ripard at free-electrons.com>");
> +MODULE_DESCRIPTION("Himax HX-8357 LCD Driver");
> +MODULE_LICENSE("GPL");
> --
> 1.7.10.4
>
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