diff options
Diffstat (limited to 'drivers/video/backlight/hx8357.c')
| -rw-r--r-- | drivers/video/backlight/hx8357.c | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/drivers/video/backlight/hx8357.c b/drivers/video/backlight/hx8357.c new file mode 100644 index 0000000..a0482b5 --- /dev/null +++ b/drivers/video/backlight/hx8357.c @@ -0,0 +1,497 @@ +/* + * 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"); |
