aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.4/0443-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch
blob: 3589746b54c39760c076ec14c909a2b3d94a1e9d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
From 4da2b00d471f7fca0d770551afafa95e85ec9b89 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");