--- /dev/null
+/*
+ * 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");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff