--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Orisetech OTA5601A TFT LCD panel driver
+ *
+ * Copyright (C) 2021, Christophe Branchereau <cbranchereau@gmail.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define OTA5601A_CTL 0x01
+#define OTA5601A_CTL_OFF 0x00
+#define OTA5601A_CTL_ON BIT(0)
+
+struct ota5601a_panel_info {
+ const struct drm_display_mode *display_modes;
+ unsigned int num_modes;
+ u16 width_mm, height_mm;
+ u32 bus_format, bus_flags;
+};
+
+struct ota5601a {
+ struct drm_panel drm_panel;
+ struct regmap *map;
+ struct regulator *supply;
+ const struct ota5601a_panel_info *panel_info;
+
+ struct gpio_desc *reset_gpio;
+};
+
+static inline struct ota5601a *to_ota5601a(struct drm_panel *panel)
+{
+ return container_of(panel, struct ota5601a, drm_panel);
+}
+
+static const struct reg_sequence ota5601a_panel_regs[] = {
+ { 0xfd, 0x00 }, /* Page Shift */
+ { 0x02, 0x00 }, /* Reset */
+
+ { 0x18, 0x00 }, /* Interface Sel: RGB 24 Bits */
+ { 0x34, 0x20 }, /* Undocumented */
+
+ { 0x0c, 0x01 }, /* Contrast set by CMD1 == within page 0x00 */
+ { 0x0d, 0x48 }, /* R Brightness */
+ { 0x0e, 0x48 }, /* G Brightness */
+ { 0x0f, 0x48 }, /* B Brightness */
+ { 0x07, 0x40 }, /* R Contrast */
+ { 0x08, 0x33 }, /* G Contrast */
+ { 0x09, 0x3a }, /* B Contrast */
+
+ { 0x16, 0x01 }, /* NTSC Sel */
+ { 0x19, 0x8d }, /* VBLK */
+ { 0x1a, 0x28 }, /* HBLK */
+ { 0x1c, 0x00 }, /* Scan Shift Dir. */
+
+ { 0xfd, 0xc5 }, /* Page Shift */
+ { 0x82, 0x0c }, /* PWR_CTRL Pump */
+ { 0xa2, 0xb4 }, /* PWR_CTRL VGH/VGL */
+
+ { 0xfd, 0xc4 }, /* Page Shift - What follows is listed as "RGB 24bit Timing Set" */
+ { 0x82, 0x45 },
+
+ { 0xfd, 0xc1 },
+ { 0x91, 0x02 },
+
+ { 0xfd, 0xc0 },
+ { 0xa1, 0x01 },
+ { 0xa2, 0x1f },
+ { 0xa3, 0x0b },
+ { 0xa4, 0x38 },
+ { 0xa5, 0x00 },
+ { 0xa6, 0x0a },
+ { 0xa7, 0x38 },
+ { 0xa8, 0x00 },
+ { 0xa9, 0x0a },
+ { 0xaa, 0x37 },
+
+ { 0xfd, 0xce },
+ { 0x81, 0x18 },
+ { 0x82, 0x43 },
+ { 0x83, 0x43 },
+ { 0x91, 0x06 },
+ { 0x93, 0x38 },
+ { 0x94, 0x02 },
+ { 0x95, 0x06 },
+ { 0x97, 0x38 },
+ { 0x98, 0x02 },
+ { 0x99, 0x06 },
+ { 0x9b, 0x38 },
+ { 0x9c, 0x02 },
+
+ { 0xfd, 0x00 }, /* Page Shift */
+};
+
+static const struct regmap_config ota5601a_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int ota5601a_prepare(struct drm_panel *drm_panel)
+{
+ struct ota5601a *panel = to_ota5601a(drm_panel);
+ int err;
+
+ err = regulator_enable(panel->supply);
+ if (err) {
+ dev_err(drm_panel->dev, "Failed to enable power supply: %d\n", err);
+ return err;
+ }
+
+ /* Reset to be held low for 10us min according to the doc, 10ms before sending commands */
+ gpiod_set_value_cansleep(panel->reset_gpio, 1);
+ usleep_range(10, 30);
+ gpiod_set_value_cansleep(panel->reset_gpio, 0);
+ usleep_range(10000, 20000);
+
+ /* Init all registers. */
+ err = regmap_multi_reg_write(panel->map, ota5601a_panel_regs,
+ ARRAY_SIZE(ota5601a_panel_regs));
+ if (err) {
+ dev_err(drm_panel->dev, "Failed to init registers: %d\n", err);
+ goto err_disable_regulator;
+ }
+
+ msleep(120);
+
+ return 0;
+
+err_disable_regulator:
+ regulator_disable(panel->supply);
+ return err;
+}
+
+static int ota5601a_unprepare(struct drm_panel *drm_panel)
+{
+ struct ota5601a *panel = to_ota5601a(drm_panel);
+
+ gpiod_set_value_cansleep(panel->reset_gpio, 1);
+
+ regulator_disable(panel->supply);
+
+ return 0;
+}
+
+static int ota5601a_enable(struct drm_panel *drm_panel)
+{
+ struct ota5601a *panel = to_ota5601a(drm_panel);
+ int err;
+
+ err = regmap_write(panel->map, OTA5601A_CTL, OTA5601A_CTL_ON);
+
+ if (err) {
+ dev_err(drm_panel->dev, "Unable to enable panel: %d\n", err);
+ return err;
+ }
+
+ if (drm_panel->backlight) {
+ /* Wait for the picture to be ready before enabling backlight */
+ msleep(120);
+ }
+
+ return 0;
+}
+
+static int ota5601a_disable(struct drm_panel *drm_panel)
+{
+ struct ota5601a *panel = to_ota5601a(drm_panel);
+ int err;
+
+ err = regmap_write(panel->map, OTA5601A_CTL, OTA5601A_CTL_OFF);
+
+ if (err) {
+ dev_err(drm_panel->dev, "Unable to disable panel: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int ota5601a_get_modes(struct drm_panel *drm_panel,
+ struct drm_connector *connector)
+{
+ struct ota5601a *panel = to_ota5601a(drm_panel);
+ const struct ota5601a_panel_info *panel_info = panel->panel_info;
+ struct drm_display_mode *mode;
+ unsigned int i;
+
+ for (i = 0; i < panel_info->num_modes; i++) {
+ mode = drm_mode_duplicate(connector->dev,
+ &panel_info->display_modes[i]);
+ if (!mode)
+ return -ENOMEM;
+
+ drm_mode_set_name(mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER;
+ if (panel_info->num_modes == 1)
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+ drm_mode_probed_add(connector, mode);
+ }
+
+ connector->display_info.bpc = 8;
+ connector->display_info.width_mm = panel_info->width_mm;
+ connector->display_info.height_mm = panel_info->height_mm;
+
+ drm_display_info_set_bus_formats(&connector->display_info,
+ &panel_info->bus_format, 1);
+ connector->display_info.bus_flags = panel_info->bus_flags;
+
+ return panel_info->num_modes;
+}
+
+static const struct drm_panel_funcs ota5601a_funcs = {
+ .prepare = ota5601a_prepare,
+ .unprepare = ota5601a_unprepare,
+ .enable = ota5601a_enable,
+ .disable = ota5601a_disable,
+ .get_modes = ota5601a_get_modes,
+};
+
+static int ota5601a_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct device *dev = &spi->dev;
+ struct ota5601a *panel;
+ int err;
+
+ panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
+ if (!panel)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, panel);
+
+ panel->panel_info = (const struct ota5601a_panel_info *)id->driver_data;
+ if (!panel->panel_info)
+ return -EINVAL;
+
+ panel->supply = devm_regulator_get(dev, "power");
+ if (IS_ERR(panel->supply)) {
+ dev_err(dev, "Failed to get power supply\n");
+ return PTR_ERR(panel->supply);
+ }
+
+ panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(panel->reset_gpio)) {
+ dev_err(dev, "Failed to get reset GPIO\n");
+ return PTR_ERR(panel->reset_gpio);
+ }
+
+ spi->bits_per_word = 8;
+ spi->mode = SPI_MODE_3 | SPI_3WIRE;
+ err = spi_setup(spi);
+ if (err) {
+ dev_err(dev, "Failed to setup SPI\n");
+ return err;
+ }
+
+ panel->map = devm_regmap_init_spi(spi, &ota5601a_regmap_config);
+ if (IS_ERR(panel->map)) {
+ dev_err(dev, "Failed to init regmap\n");
+ return PTR_ERR(panel->map);
+ }
+
+ drm_panel_init(&panel->drm_panel, dev, &ota5601a_funcs,
+ DRM_MODE_CONNECTOR_DPI);
+
+ err = drm_panel_of_backlight(&panel->drm_panel);
+ if (err) {
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get backlight handle\n");
+ return err;
+ }
+
+ drm_panel_add(&panel->drm_panel);
+
+ return 0;
+}
+
+static void ota5601a_remove(struct spi_device *spi)
+{
+ struct ota5601a *panel = spi_get_drvdata(spi);
+
+ drm_panel_remove(&panel->drm_panel);
+
+ ota5601a_disable(&panel->drm_panel);
+ ota5601a_unprepare(&panel->drm_panel);
+}
+
+static const struct drm_display_mode gpt3_display_modes[] = {
+ { /* 60 Hz */
+ .clock = 27000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 220,
+ .hsync_end = 640 + 220 + 20,
+ .htotal = 640 + 220 + 20 + 20,
+ .vdisplay = 480,
+ .vsync_start = 480 + 7,
+ .vsync_end = 480 + 7 + 6,
+ .vtotal = 480 + 7 + 6 + 7,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ },
+
+ { /* 50 Hz */
+ .clock = 24000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 280,
+ .hsync_end = 640 + 280 + 20,
+ .htotal = 640 + 280 + 20 + 20,
+ .vdisplay = 480,
+ .vsync_start = 480 + 7,
+ .vsync_end = 480 + 7 + 6,
+ .vtotal = 480 + 7 + 6 + 7,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ },
+};
+
+static const struct ota5601a_panel_info gpt3_info = {
+ .display_modes = gpt3_display_modes,
+ .num_modes = ARRAY_SIZE(gpt3_display_modes),
+ .width_mm = 71,
+ .height_mm = 51,
+ .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+ .bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
+};
+
+static const struct spi_device_id gpt3_id[] = {
+ { "gpt3", (kernel_ulong_t)&gpt3_info },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, gpt3_id);
+
+static const struct of_device_id ota5601a_of_match[] = {
+ { .compatible = "focaltech,gpt3" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ota5601a_of_match);
+
+static struct spi_driver ota5601a_driver = {
+ .driver = {
+ .name = "ota5601a",
+ .of_match_table = ota5601a_of_match,
+ },
+ .id_table = gpt3_id,
+ .probe = ota5601a_probe,
+ .remove = ota5601a_remove,
+};
+
+module_spi_driver(ota5601a_driver);
+
+MODULE_AUTHOR("Christophe Branchereau <cbranchereau@gmail.com>");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff