| // 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"); |