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 000000000000..a0482b567bfe
--- /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");