--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright © 2023 Raspberry Pi Ltd
+ *
+ * Based on panel-raspberrypi-touchscreen by Broadcom
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/i2c.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/pm.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#define WS_DSI_DRIVER_NAME "ws-ts-dsi"
+
+struct ws_panel {
+ struct drm_panel base;
+ struct mipi_dsi_device *dsi;
+ struct i2c_client *i2c;
+ const struct drm_display_mode *mode;
+ enum drm_panel_orientation orientation;
+};
+
+/* 2.8inch 480x640
+ * https://www.waveshare.com/product/raspberry-pi/displays/2.8inch-dsi-lcd.htm
+ */
+static const struct drm_display_mode ws_panel_2_8_mode = {
+ .clock = 50000,
+ .hdisplay = 480,
+ .hsync_start = 480 + 150,
+ .hsync_end = 480 + 150 + 50,
+ .htotal = 480 + 150 + 50 + 150,
+ .vdisplay = 640,
+ .vsync_start = 640 + 150,
+ .vsync_end = 640 + 150 + 50,
+ .vtotal = 640 + 150 + 50 + 150,
+};
+
+/* 3.4inch 800x800 Round
+ * https://www.waveshare.com/product/displays/lcd-oled/3.4inch-dsi-lcd-c.htm
+ */
+static const struct drm_display_mode ws_panel_3_4_mode = {
+ .clock = 50000,
+ .hdisplay = 800,
+ .hsync_start = 800 + 32,
+ .hsync_end = 800 + 32 + 6,
+ .htotal = 800 + 32 + 6 + 120,
+ .vdisplay = 800,
+ .vsync_start = 800 + 8,
+ .vsync_end = 800 + 8 + 4,
+ .vtotal = 800 + 8 + 4 + 16,
+};
+
+/* 4.0inch 480x800
+ * https://www.waveshare.com/product/raspberry-pi/displays/4inch-dsi-lcd.htm
+ */
+static const struct drm_display_mode ws_panel_4_0_mode = {
+ .clock = 50000,
+ .hdisplay = 480,
+ .hsync_start = 480 + 150,
+ .hsync_end = 480 + 150 + 100,
+ .htotal = 480 + 150 + 100 + 150,
+ .vdisplay = 800,
+ .vsync_start = 800 + 20,
+ .vsync_end = 800 + 20 + 100,
+ .vtotal = 800 + 20 + 100 + 20,
+};
+
+/* 7.0inch C 1024x600
+ * https://www.waveshare.com/product/raspberry-pi/displays/lcd-oled/7inch-dsi-lcd-c-with-case-a.htm
+ */
+static const struct drm_display_mode ws_panel_7_0_c_mode = {
+ .clock = 50000,
+ .hdisplay = 1024,
+ .hsync_start = 1024 + 100,
+ .hsync_end = 1024 + 100 + 100,
+ .htotal = 1024 + 100 + 100 + 100,
+ .vdisplay = 600,
+ .vsync_start = 600 + 10,
+ .vsync_end = 600 + 10 + 10,
+ .vtotal = 600 + 10 + 10 + 10,
+};
+
+/* 7.9inch 400x1280
+ * https://www.waveshare.com/product/raspberry-pi/displays/7.9inch-dsi-lcd.htm
+ */
+static const struct drm_display_mode ws_panel_7_9_mode = {
+ .clock = 50000,
+ .hdisplay = 400,
+ .hsync_start = 400 + 40,
+ .hsync_end = 400 + 40 + 30,
+ .htotal = 400 + 40 + 30 + 40,
+ .vdisplay = 1280,
+ .vsync_start = 1280 + 20,
+ .vsync_end = 1280 + 20 + 10,
+ .vtotal = 1280 + 20 + 10 + 20,
+};
+
+/* 8.0inch or 10.1inch 1280x800
+ * https://www.waveshare.com/product/raspberry-pi/displays/8inch-dsi-lcd-c.htm
+ * https://www.waveshare.com/product/raspberry-pi/displays/10.1inch-dsi-lcd-c.htm
+ */
+static const struct drm_display_mode ws_panel_10_1_mode = {
+ .clock = 76800,
+ .hdisplay = 1280,
+ .hsync_start = 1280 + 40,
+ .hsync_end = 1280 + 40 + 20,
+ .htotal = 1280 + 40 + 20 + 40,
+ .vdisplay = 800,
+ .vsync_start = 800 + 40,
+ .vsync_end = 800 + 40 + 48,
+ .vtotal = 800 + 40 + 48 + 40,
+};
+
+/* 11.9inch 320x1480
+ * https://www.waveshare.com/product/raspberry-pi/displays/11.9inch-dsi-lcd.htm
+ */
+static const struct drm_display_mode ws_panel_11_9_mode = {
+ .clock = 50000,
+ .hdisplay = 320,
+ .hsync_start = 320 + 60,
+ .hsync_end = 320 + 60 + 60,
+ .htotal = 320 + 60 + 60 + 120,
+ .vdisplay = 1480,
+ .vsync_start = 1480 + 60,
+ .vsync_end = 1480 + 60 + 60,
+ .vtotal = 1480 + 60 + 60 + 60,
+};
+
+static struct ws_panel *panel_to_ts(struct drm_panel *panel)
+{
+ return container_of(panel, struct ws_panel, base);
+}
+
+static void ws_panel_i2c_write(struct ws_panel *ts, u8 reg, u8 val)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(ts->i2c, reg, val);
+ if (ret)
+ dev_err(&ts->i2c->dev, "I2C write failed: %d\n", ret);
+}
+
+static int ws_panel_disable(struct drm_panel *panel)
+{
+ struct ws_panel *ts = panel_to_ts(panel);
+
+ ws_panel_i2c_write(ts, 0xad, 0x00);
+
+ return 0;
+}
+
+static int ws_panel_unprepare(struct drm_panel *panel)
+{
+ return 0;
+}
+
+static int ws_panel_prepare(struct drm_panel *panel)
+{
+ return 0;
+}
+
+static int ws_panel_enable(struct drm_panel *panel)
+{
+ struct ws_panel *ts = panel_to_ts(panel);
+
+ ws_panel_i2c_write(ts, 0xad, 0x01);
+
+ return 0;
+}
+
+static int ws_panel_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ struct ws_panel *ts = panel_to_ts(panel);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, ts->mode);
+ if (!mode) {
+ dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
+ ts->mode->hdisplay,
+ ts->mode->vdisplay,
+ drm_mode_vrefresh(ts->mode));
+ }
+
+ mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+ drm_mode_set_name(mode);
+
+ drm_mode_probed_add(connector, mode);
+
+ connector->display_info.bpc = 8;
+ connector->display_info.width_mm = 154;
+ connector->display_info.height_mm = 86;
+ drm_display_info_set_bus_formats(&connector->display_info,
+ &bus_format, 1);
+
+ /*
+ * TODO: Remove once all drm drivers call
+ * drm_connector_set_orientation_from_panel()
+ */
+ drm_connector_set_panel_orientation(connector, ts->orientation);
+
+ return 1;
+}
+
+static enum drm_panel_orientation ws_panel_get_orientation(struct drm_panel *panel)
+{
+ struct ws_panel *ts = panel_to_ts(panel);
+
+ return ts->orientation;
+}
+
+static const struct drm_panel_funcs ws_panel_funcs = {
+ .disable = ws_panel_disable,
+ .unprepare = ws_panel_unprepare,
+ .prepare = ws_panel_prepare,
+ .enable = ws_panel_enable,
+ .get_modes = ws_panel_get_modes,
+ .get_orientation = ws_panel_get_orientation,
+};
+
+static int ws_panel_bl_update_status(struct backlight_device *bl)
+{
+ struct ws_panel *ts = bl_get_data(bl);
+
+ ws_panel_i2c_write(ts, 0xab, 0xff - backlight_get_brightness(bl));
+ ws_panel_i2c_write(ts, 0xaa, 0x01);
+
+ return 0;
+}
+
+static const struct backlight_ops ws_panel_bl_ops = {
+ .update_status = ws_panel_bl_update_status,
+};
+
+static struct backlight_device *
+ws_panel_create_backlight(struct ws_panel *ts)
+{
+ struct device *dev = ts->base.dev;
+ const struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = 255,
+ .max_brightness = 255,
+ };
+
+ return devm_backlight_device_register(dev, dev_name(dev), dev, ts,
+ &ws_panel_bl_ops, &props);
+}
+
+static int ws_panel_probe(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct ws_panel *ts;
+ struct device_node *endpoint, *dsi_host_node;
+ struct mipi_dsi_host *host;
+ struct mipi_dsi_device_info info = {
+ .type = WS_DSI_DRIVER_NAME,
+ .channel = 0,
+ .node = NULL,
+ };
+ int ret;
+
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->mode = of_device_get_match_data(dev);
+ if (!ts->mode)
+ return -EINVAL;
+
+ i2c_set_clientdata(i2c, ts);
+
+ ts->i2c = i2c;
+
+ ws_panel_i2c_write(ts, 0xc0, 0x01);
+ ws_panel_i2c_write(ts, 0xc2, 0x01);
+ ws_panel_i2c_write(ts, 0xac, 0x01);
+
+ ret = of_drm_get_panel_orientation(dev->of_node, &ts->orientation);
+ if (ret) {
+ dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
+ return ret;
+ }
+
+ /* Look up the DSI host. It needs to probe before we do. */
+ endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+ if (!endpoint)
+ return -ENODEV;
+
+ dsi_host_node = of_graph_get_remote_port_parent(endpoint);
+ if (!dsi_host_node)
+ goto error;
+
+ host = of_find_mipi_dsi_host_by_node(dsi_host_node);
+ of_node_put(dsi_host_node);
+ if (!host) {
+ of_node_put(endpoint);
+ return -EPROBE_DEFER;
+ }
+
+ info.node = of_graph_get_remote_port(endpoint);
+ if (!info.node)
+ goto error;
+
+ of_node_put(endpoint);
+
+ ts->dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+ if (IS_ERR(ts->dsi)) {
+ dev_err(dev, "DSI device registration failed: %ld\n",
+ PTR_ERR(ts->dsi));
+ return PTR_ERR(ts->dsi);
+ }
+
+ drm_panel_init(&ts->base, dev, &ws_panel_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+
+ ts->base.backlight = ws_panel_create_backlight(ts);
+ if (IS_ERR(ts->base.backlight)) {
+ ret = PTR_ERR(ts->base.backlight);
+ dev_err(dev, "Failed to create backlight: %d\n", ret);
+ return ret;
+ }
+
+ /* This appears last, as it's what will unblock the DSI host
+ * driver's component bind function.
+ */
+ drm_panel_add(&ts->base);
+
+ ts->dsi->mode_flags = (MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+ MIPI_DSI_MODE_LPM);
+ ts->dsi->format = MIPI_DSI_FMT_RGB888;
+ ts->dsi->lanes = 2;
+
+ ret = devm_mipi_dsi_attach(dev, ts->dsi);
+
+ if (ret)
+ dev_err(dev, "failed to attach dsi to host: %d\n", ret);
+
+ return 0;
+
+error:
+ of_node_put(endpoint);
+ return -ENODEV;
+}
+
+static void ws_panel_remove(struct i2c_client *i2c)
+{
+ struct ws_panel *ts = i2c_get_clientdata(i2c);
+
+ drm_panel_remove(&ts->base);
+}
+
+static const struct of_device_id ws_panel_of_ids[] = {
+ {
+ .compatible = "waveshare,2.8inch-panel",
+ .data = &ws_panel_2_8_mode,
+ }, {
+ .compatible = "waveshare,3.4inch-panel",
+ .data = &ws_panel_3_4_mode,
+ }, {
+ .compatible = "waveshare,4.0inch-panel",
+ .data = &ws_panel_4_0_mode,
+ }, {
+ .compatible = "waveshare,7.0inch-c-panel",
+ .data = &ws_panel_7_0_c_mode,
+ }, {
+ .compatible = "waveshare,7.9inch-panel",
+ .data = &ws_panel_7_9_mode,
+ }, {
+ .compatible = "waveshare,8.0inch-panel",
+ .data = &ws_panel_10_1_mode,
+ }, {
+ .compatible = "waveshare,10.1inch-panel",
+ .data = &ws_panel_10_1_mode,
+ }, {
+ .compatible = "waveshare,11.9inch-panel",
+ .data = &ws_panel_11_9_mode,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, ws_panel_of_ids);
+
+static struct i2c_driver ws_panel_driver = {
+ .driver = {
+ .name = "ws_touchscreen",
+ .of_match_table = ws_panel_of_ids,
+ },
+ .probe = ws_panel_probe,
+ .remove = ws_panel_remove,
+};
+module_i2c_driver(ws_panel_driver);
+
+MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
+MODULE_DESCRIPTION("Waveshare DSI panel driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff