mirror of https://github.com/hak5/openwrt.git
391 lines
11 KiB
Diff
391 lines
11 KiB
Diff
From 4557de6d23737cf44fa5ddf1379be59d4bca2df7 Mon Sep 17 00:00:00 2001
|
|
From: Eric Anholt <eric@anholt.net>
|
|
Date: Tue, 26 Apr 2016 13:46:13 -0700
|
|
Subject: [PATCH] drm/panel: Add support for the Raspberry Pi 7" Touchscreen.
|
|
|
|
Signed-off-by: Eric Anholt <eric@anholt.net>
|
|
---
|
|
drivers/gpu/drm/panel/Kconfig | 9 +
|
|
drivers/gpu/drm/panel/Makefile | 1 +
|
|
.../gpu/drm/panel/panel-raspberrypi-touchscreen.c | 347 +++++++++++++++++++++
|
|
3 files changed, 357 insertions(+)
|
|
create mode 100644 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
|
|
|
|
--- a/drivers/gpu/drm/panel/Kconfig
|
|
+++ b/drivers/gpu/drm/panel/Kconfig
|
|
@@ -31,6 +31,15 @@ config DRM_PANEL_LG_LG4573
|
|
Say Y here if you want to enable support for LG4573 RGB panel.
|
|
To compile this driver as a module, choose M here.
|
|
|
|
+config DRM_PANEL_RASPBERRYPI_TOUCHSCREEN
|
|
+ tristate "Raspberry Pi 7-inch touchscreen panel"
|
|
+ depends on DRM_MIPI_DSI
|
|
+ depends on BACKLIGHT_CLASS_DEVICE
|
|
+ help
|
|
+ Say Y here if you want to enable support for the Raspberry
|
|
+ Pi 7" Touchscreen. To compile this driver as a module,
|
|
+ choose M here.
|
|
+
|
|
config DRM_PANEL_SAMSUNG_S6E8AA0
|
|
tristate "Samsung S6E8AA0 DSI video mode panel"
|
|
depends on OF
|
|
--- a/drivers/gpu/drm/panel/Makefile
|
|
+++ b/drivers/gpu/drm/panel/Makefile
|
|
@@ -1,5 +1,6 @@
|
|
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
|
|
obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
|
|
+obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
|
|
obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
|
|
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
|
|
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
|
|
--- /dev/null
|
|
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
|
|
@@ -0,0 +1,347 @@
|
|
+/*
|
|
+ * Copyright © 2016 Broadcom Limited
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License version 2 as
|
|
+ * published by the Free Software Foundation.
|
|
+ *
|
|
+ * Portions of this file (derived from panel-simple.c) are:
|
|
+ *
|
|
+ * Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
|
|
+ *
|
|
+ * Permission is hereby granted, free of charge, to any person obtaining a
|
|
+ * copy of this software and associated documentation files (the "Software"),
|
|
+ * to deal in the Software without restriction, including without limitation
|
|
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
|
|
+ * and/or sell copies of the Software, and to permit persons to whom the
|
|
+ * Software is furnished to do so, subject to the following conditions:
|
|
+ *
|
|
+ * The above copyright notice and this permission notice (including the
|
|
+ * next paragraph) shall be included in all copies or substantial portions
|
|
+ * of the Software.
|
|
+ *
|
|
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
+ * DEALINGS IN THE SOFTWARE.
|
|
+ */
|
|
+
|
|
+/**
|
|
+ * DOC: Raspberry Pi 7" touchscreen panel driver.
|
|
+ *
|
|
+ * The 7" touchscreen consists of a DPI LCD panel, a Toshiba
|
|
+ * TC358762XBG DSI-DPI bridge, and an I2C-connected Atmel ATTINY88-MUR
|
|
+ * controlling power management, the LCD PWM, and the touchscreen.
|
|
+ *
|
|
+ * This driver presents this device as a MIPI DSI panel to the DRM
|
|
+ * driver, and should expose the touchscreen as a HID device.
|
|
+ */
|
|
+
|
|
+#include <linux/backlight.h>
|
|
+#include <linux/delay.h>
|
|
+#include <linux/err.h>
|
|
+#include <linux/fb.h>
|
|
+#include <linux/gpio.h>
|
|
+#include <linux/gpio/consumer.h>
|
|
+#include <linux/i2c.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_panel.h>
|
|
+#include <drm/drmP.h>
|
|
+#include <drm/drm_crtc.h>
|
|
+#include <drm/drm_mipi_dsi.h>
|
|
+#include <drm/drm_panel.h>
|
|
+
|
|
+struct rpi_touchscreen {
|
|
+ struct drm_panel base;
|
|
+ struct mipi_dsi_device *dsi;
|
|
+ struct i2c_client *bridge_i2c;
|
|
+ struct backlight_device *backlight;
|
|
+
|
|
+ bool prepared;
|
|
+ bool enabled;
|
|
+
|
|
+ /* Version of the firmware on the bridge chip */
|
|
+ int atmel_ver;
|
|
+};
|
|
+
|
|
+static const struct drm_display_mode rpi_touchscreen_modes[] = {
|
|
+ {
|
|
+ /* This is assuming that we'll be running the DSI PLL
|
|
+ * at 2Ghz / 3 (since we only get integer dividers),
|
|
+ * so a pixel clock of 2Ghz / 3 / 8.
|
|
+ */
|
|
+ .clock = 83333,
|
|
+ .hdisplay = 800,
|
|
+ .hsync_start = 800 + 61,
|
|
+ .hsync_end = 800 + 61 + 2,
|
|
+ .htotal = 800 + 61 + 2 + 44,
|
|
+ .vdisplay = 480,
|
|
+ .vsync_start = 480 + 7,
|
|
+ .vsync_end = 480 + 7 + 2,
|
|
+ .vtotal = 480 + 7 + 2 + 21,
|
|
+ .vrefresh = 60,
|
|
+ },
|
|
+};
|
|
+
|
|
+static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
|
|
+{
|
|
+ return container_of(panel, struct rpi_touchscreen, base);
|
|
+}
|
|
+
|
|
+struct regdump {
|
|
+ const char *reg;
|
|
+ u32 offset;
|
|
+};
|
|
+
|
|
+#define REGDUMP(reg) { #reg, reg }
|
|
+
|
|
+static int rpi_touchscreen_disable(struct drm_panel *panel)
|
|
+{
|
|
+ struct rpi_touchscreen *ts = panel_to_ts(panel);
|
|
+ pr_err("disable\n");
|
|
+
|
|
+ if (!ts->enabled)
|
|
+ return 0;
|
|
+
|
|
+ if (ts->backlight) {
|
|
+ ts->backlight->props.power = FB_BLANK_POWERDOWN;
|
|
+ backlight_update_status(ts->backlight);
|
|
+ }
|
|
+
|
|
+ ts->enabled = false;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_unprepare(struct drm_panel *panel)
|
|
+{
|
|
+ struct rpi_touchscreen *ts = panel_to_ts(panel);
|
|
+
|
|
+ if (!ts->prepared)
|
|
+ return 0;
|
|
+
|
|
+ ts->prepared = false;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_prepare(struct drm_panel *panel)
|
|
+{
|
|
+ struct rpi_touchscreen *ts = panel_to_ts(panel);
|
|
+
|
|
+ if (ts->prepared)
|
|
+ return 0;
|
|
+
|
|
+ ts->prepared = true;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Powers on the panel once the DSI link is up.
|
|
+ *
|
|
+ * The TC358762 is run in PLLOFF mode, where it usees the MIPI DSI
|
|
+ * byte clock instead of an external reference clock. This means that
|
|
+ * we need the DSI host to be on and transmitting before we start
|
|
+ * talking to it.
|
|
+ */
|
|
+static int rpi_touchscreen_enable(struct drm_panel *panel)
|
|
+{
|
|
+ struct rpi_touchscreen *ts = panel_to_ts(panel);
|
|
+
|
|
+ if (ts->enabled)
|
|
+ return 0;
|
|
+
|
|
+ if (ts->backlight) {
|
|
+ ts->backlight->props.power = FB_BLANK_UNBLANK;
|
|
+ backlight_update_status(ts->backlight);
|
|
+ }
|
|
+
|
|
+ ts->enabled = true;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_get_modes(struct drm_panel *panel)
|
|
+{
|
|
+ struct drm_connector *connector = panel->connector;
|
|
+ struct drm_device *drm = panel->drm;
|
|
+ unsigned int i, num = 0;
|
|
+
|
|
+ for (i = 0; i < ARRAY_SIZE(rpi_touchscreen_modes); i++) {
|
|
+ const struct drm_display_mode *m = &rpi_touchscreen_modes[i];
|
|
+ struct drm_display_mode *mode;
|
|
+
|
|
+ mode = drm_mode_duplicate(drm, m);
|
|
+ if (!mode) {
|
|
+ dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
|
|
+ m->hdisplay, m->vdisplay, m->vrefresh);
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ mode->type |= DRM_MODE_TYPE_DRIVER;
|
|
+
|
|
+ if (i == 0)
|
|
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
|
|
+
|
|
+ drm_mode_set_name(mode);
|
|
+
|
|
+ drm_mode_probed_add(connector, mode);
|
|
+ num++;
|
|
+ }
|
|
+
|
|
+ connector->display_info.bpc = 8;
|
|
+ connector->display_info.width_mm = 217; /* XXX */
|
|
+ connector->display_info.height_mm = 136; /* XXX */
|
|
+
|
|
+ return num;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_backlight_update(struct backlight_device *bl)
|
|
+{
|
|
+ int brightness = bl->props.brightness;
|
|
+
|
|
+ if (bl->props.power != FB_BLANK_UNBLANK ||
|
|
+ bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
|
|
+ brightness = 0;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static const struct backlight_ops rpi_touchscreen_backlight_ops = {
|
|
+ .update_status = rpi_touchscreen_backlight_update,
|
|
+};
|
|
+
|
|
+static const struct drm_panel_funcs rpi_touchscreen_funcs = {
|
|
+ .disable = rpi_touchscreen_disable,
|
|
+ .unprepare = rpi_touchscreen_unprepare,
|
|
+ .prepare = rpi_touchscreen_prepare,
|
|
+ .enable = rpi_touchscreen_enable,
|
|
+ .get_modes = rpi_touchscreen_get_modes,
|
|
+};
|
|
+
|
|
+static struct i2c_client *rpi_touchscreen_get_i2c(struct device *dev,
|
|
+ const char *name)
|
|
+{
|
|
+ struct device_node *node;
|
|
+ struct i2c_client *client;
|
|
+
|
|
+ node = of_parse_phandle(dev->of_node, name, 0);
|
|
+ if (!node)
|
|
+ return ERR_PTR(-ENODEV);
|
|
+
|
|
+ client = of_find_i2c_device_by_node(node);
|
|
+
|
|
+ of_node_put(node);
|
|
+
|
|
+ return client;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_dsi_probe(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ struct device *dev = &dsi->dev;
|
|
+ struct rpi_touchscreen *ts;
|
|
+ int ret;
|
|
+
|
|
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
|
|
+ if (!ts)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ dev_set_drvdata(dev, ts);
|
|
+
|
|
+ ts->dsi = dsi;
|
|
+ dsi->mode_flags = (MIPI_DSI_MODE_VIDEO |
|
|
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE);
|
|
+ dsi->format = MIPI_DSI_FMT_RGB888;
|
|
+ dsi->lanes = 1;
|
|
+
|
|
+ ts->bridge_i2c =
|
|
+ rpi_touchscreen_get_i2c(dev, "raspberrypi,touchscreen-bridge");
|
|
+ if (!ts->bridge_i2c) {
|
|
+ ret = -EPROBE_DEFER;
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+#if 0
|
|
+ ts->backlight =
|
|
+ devm_backlight_device_register(dev,
|
|
+ "raspberrypi-touchscreen-backlight",
|
|
+ dev, ts,
|
|
+ &rpi_touchscreen_backlight_ops,
|
|
+ NULL);
|
|
+ if (IS_ERR(ts->backlight)) {
|
|
+ DRM_ERROR("failed to register backlight\n");
|
|
+ return PTR_ERR(ts->backlight);
|
|
+ }
|
|
+ ts->backlight->props.max_brightness = RPI_TOUCHSCREEN_MAX_BRIGHTNESS;
|
|
+ ts->backlight->props.brightness = RPI_TOUCHSCREEN_MAX_BRIGHTNESS;
|
|
+#endif
|
|
+
|
|
+ drm_panel_init(&ts->base);
|
|
+ ts->base.dev = dev;
|
|
+ ts->base.funcs = &rpi_touchscreen_funcs;
|
|
+
|
|
+ ret = drm_panel_add(&ts->base);
|
|
+ if (ret < 0)
|
|
+ goto err_release_bridge;
|
|
+
|
|
+ return mipi_dsi_attach(dsi);
|
|
+
|
|
+err_release_bridge:
|
|
+ put_device(&ts->bridge_i2c->dev);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_dsi_remove(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ struct device *dev = &dsi->dev;
|
|
+ struct rpi_touchscreen *ts = dev_get_drvdata(dev);
|
|
+ int ret;
|
|
+
|
|
+ ret = mipi_dsi_detach(dsi);
|
|
+ if (ret < 0) {
|
|
+ dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ drm_panel_detach(&ts->base);
|
|
+ drm_panel_remove(&ts->base);
|
|
+
|
|
+ put_device(&ts->bridge_i2c->dev);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void rpi_touchscreen_dsi_shutdown(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ /* XXX: poweroff */
|
|
+}
|
|
+
|
|
+static const struct of_device_id rpi_touchscreen_of_match[] = {
|
|
+ { .compatible = "raspberrypi,touchscreen" },
|
|
+ { } /* sentinel */
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, rpi_touchscreen_of_match);
|
|
+
|
|
+static struct mipi_dsi_driver rpi_touchscreen_driver = {
|
|
+ .driver = {
|
|
+ .name = "raspberrypi-touchscreen",
|
|
+ .of_match_table = rpi_touchscreen_of_match,
|
|
+ },
|
|
+ .probe = rpi_touchscreen_dsi_probe,
|
|
+ .remove = rpi_touchscreen_dsi_remove,
|
|
+ .shutdown = rpi_touchscreen_dsi_shutdown,
|
|
+};
|
|
+module_mipi_dsi_driver(rpi_touchscreen_driver);
|
|
+
|
|
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
|
+MODULE_DESCRIPTION("Raspberry Pi 7-inch touchscreen driver");
|
|
+MODULE_LICENSE("GPL v2");
|