add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/input/touchscreen/exc3000.c
..
..
@@ -1,17 +1,16 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * Driver for I2C connected EETI EXC3000 multiple touch controller
3
4
  *
4
5
  * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
5
6
  *
6
7
  * minimal implementation based on egalax_ts.c and egalax_i2c.c
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License version 2 as
10
- * published by the Free Software Foundation.
11
8
  */
12
9
 
13
10
 #include <linux/bitops.h>
11
+#include <linux/delay.h>
14
12
 #include <linux/device.h>
13
+#include <linux/gpio/consumer.h>
15
14
 #include <linux/i2c.h>
16
15
 #include <linux/input.h>
17
16
 #include <linux/input/mt.h>
..
..
@@ -19,6 +18,7 @@
19
18
 #include <linux/interrupt.h>
20
19
 #include <linux/module.h>
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20
 #include <linux/of.h>
21
+#include <linux/sizes.h>
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22
 #include <linux/timer.h>
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23
 #include <asm/unaligned.h>
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24
 
..
..
@@ -26,15 +26,59 @@
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26
 #define EXC3000_SLOTS_PER_FRAME		5
27
27
 #define EXC3000_LEN_FRAME		66
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28
 #define EXC3000_LEN_POINT		10
29
-#define EXC3000_MT_EVENT		6
29
+
30
+#define EXC3000_LEN_MODEL_NAME		16
31
+#define EXC3000_LEN_FW_VERSION		16
32
+
33
+#define EXC3000_MT1_EVENT		0x06
34
+#define EXC3000_MT2_EVENT		0x18
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+
30
36
 #define EXC3000_TIMEOUT_MS		100
37
+
38
+#define EXC3000_RESET_MS		10
39
+#define EXC3000_READY_MS		100
40
+
41
+static const struct i2c_device_id exc3000_id[];
42
+
43
+struct eeti_dev_info {
44
+	const char *name;
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+	int max_xy;
46
+};
47
+
48
+enum eeti_dev_id {
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+	EETI_EXC3000,
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+	EETI_EXC80H60,
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+	EETI_EXC80H84,
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+};
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+
54
+static struct eeti_dev_info exc3000_info[] = {
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+	[EETI_EXC3000] = {
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+		.name = "EETI EXC3000 Touch Screen",
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+		.max_xy = SZ_4K - 1,
58
+	},
59
+	[EETI_EXC80H60] = {
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+		.name = "EETI EXC80H60 Touch Screen",
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+		.max_xy = SZ_16K - 1,
62
+	},
63
+	[EETI_EXC80H84] = {
64
+		.name = "EETI EXC80H84 Touch Screen",
65
+		.max_xy = SZ_16K - 1,
66
+	},
67
+};
31
68
 
32
69
 struct exc3000_data {
33
70
 	struct i2c_client *client;
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+	const struct eeti_dev_info *info;
34
72
 	struct input_dev *input;
35
73
 	struct touchscreen_properties prop;
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+	struct gpio_desc *reset;
36
75
 	struct timer_list timer;
37
76
 	u8 buf[2 * EXC3000_LEN_FRAME];
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+	struct completion wait_event;
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+	struct mutex query_lock;
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+	int query_result;
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+	char model[EXC3000_LEN_MODEL_NAME];
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+	char fw_version[EXC3000_LEN_FW_VERSION];
38
82
 };
39
83
 
40
84
 static void exc3000_report_slots(struct input_dev *input,
..
..
@@ -61,9 +105,14 @@
61
105
 	input_sync(data->input);
62
106
 }
63
107
 
64
-static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
108
+static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
65
109
 {
110
+	struct i2c_client *client = data->client;
111
+	u8 expected_event = EXC3000_MT1_EVENT;
66
112
 	int ret;
113
+
114
+	if (data->info->max_xy == SZ_16K - 1)
115
+		expected_event = EXC3000_MT2_EVENT;
67
116
 
68
117
 	ret = i2c_master_send(client, "'", 2);
69
118
 	if (ret < 0)
..
..
@@ -79,19 +128,21 @@
79
128
 	if (ret != EXC3000_LEN_FRAME)
80
129
 		return -EIO;
81
130
 
82
-	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
83
-			buf[2] != EXC3000_MT_EVENT)
131
+	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
132
+		return -EINVAL;
133
+
134
+	if (buf[2] != expected_event)
84
135
 		return -EINVAL;
85
136
 
86
137
 	return 0;
87
138
 }
88
139
 
89
-static int exc3000_read_data(struct i2c_client *client,
140
+static int exc3000_read_data(struct exc3000_data *data,
90
141
 			     u8 *buf, int *n_slots)
91
142
 {
92
143
 	int error;
93
144
 
94
-	error = exc3000_read_frame(client, buf);
145
+	error = exc3000_read_frame(data, buf);
95
146
 	if (error)
96
147
 		return error;
97
148
 
..
..
@@ -101,7 +152,7 @@
101
152
 
102
153
 	if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
103
154
 		/* Read 2nd frame to get the rest of the contacts. */
104
-		error = exc3000_read_frame(client, buf + EXC3000_LEN_FRAME);
155
+		error = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
105
156
 		if (error)
106
157
 			return error;
107
158
 
..
..
@@ -109,6 +160,28 @@
109
160
 		if (buf[EXC3000_LEN_FRAME + 3] != 0)
110
161
 			return -EINVAL;
111
162
 	}
163
+
164
+	return 0;
165
+}
166
+
167
+static int exc3000_query_interrupt(struct exc3000_data *data)
168
+{
169
+	u8 *buf = data->buf;
170
+	int error;
171
+
172
+	error = i2c_master_recv(data->client, buf, EXC3000_LEN_FRAME);
173
+	if (error < 0)
174
+		return error;
175
+
176
+	if (buf[0] != 'B')
177
+		return -EPROTO;
178
+
179
+	if (buf[4] == 'E')
180
+		strlcpy(data->model, buf + 5, sizeof(data->model));
181
+	else if (buf[4] == 'D')
182
+		strlcpy(data->fw_version, buf + 5, sizeof(data->fw_version));
183
+	else
184
+		return -EPROTO;
112
185
 
113
186
 	return 0;
114
187
 }
..
..
@@ -121,7 +194,13 @@
121
194
 	int slots, total_slots;
122
195
 	int error;
123
196
 
124
-	error = exc3000_read_data(data->client, buf, &total_slots);
197
+	if (mutex_is_locked(&data->query_lock)) {
198
+		data->query_result = exc3000_query_interrupt(data);
199
+		complete(&data->wait_event);
200
+		goto out;
201
+	}
202
+
203
+	error = exc3000_read_data(data, buf, &total_slots);
125
204
 	if (error) {
126
205
 		/* Schedule a timer to release "stuck" contacts */
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206
 		mod_timer(&data->timer,
..
..
@@ -148,31 +227,132 @@
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227
 	return IRQ_HANDLED;
149
228
 }
150
229
 
151
-static int exc3000_probe(struct i2c_client *client,
152
-			 const struct i2c_device_id *id)
230
+static ssize_t fw_version_show(struct device *dev,
231
+			       struct device_attribute *attr, char *buf)
232
+{
233
+	struct i2c_client *client = to_i2c_client(dev);
234
+	struct exc3000_data *data = i2c_get_clientdata(client);
235
+	static const u8 request[68] = {
236
+		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'D', 0x00
237
+	};
238
+	int error;
239
+
240
+	mutex_lock(&data->query_lock);
241
+
242
+	data->query_result = -ETIMEDOUT;
243
+	reinit_completion(&data->wait_event);
244
+
245
+	error = i2c_master_send(client, request, sizeof(request));
246
+	if (error < 0) {
247
+		mutex_unlock(&data->query_lock);
248
+		return error;
249
+	}
250
+
251
+	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
252
+	mutex_unlock(&data->query_lock);
253
+
254
+	if (data->query_result < 0)
255
+		return data->query_result;
256
+
257
+	return sprintf(buf, "%s\n", data->fw_version);
258
+}
259
+static DEVICE_ATTR_RO(fw_version);
260
+
261
+static ssize_t exc3000_get_model(struct exc3000_data *data)
262
+{
263
+	static const u8 request[68] = {
264
+		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'E', 0x00
265
+	};
266
+	struct i2c_client *client = data->client;
267
+	int error;
268
+
269
+	mutex_lock(&data->query_lock);
270
+	data->query_result = -ETIMEDOUT;
271
+	reinit_completion(&data->wait_event);
272
+
273
+	error = i2c_master_send(client, request, sizeof(request));
274
+	if (error < 0) {
275
+		mutex_unlock(&data->query_lock);
276
+		return error;
277
+	}
278
+
279
+	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
280
+	mutex_unlock(&data->query_lock);
281
+
282
+	return data->query_result;
283
+}
284
+
285
+static ssize_t model_show(struct device *dev,
286
+			  struct device_attribute *attr, char *buf)
287
+{
288
+	struct i2c_client *client = to_i2c_client(dev);
289
+	struct exc3000_data *data = i2c_get_clientdata(client);
290
+	int error;
291
+
292
+	error = exc3000_get_model(data);
293
+	if (error < 0)
294
+		return error;
295
+
296
+	return sprintf(buf, "%s\n", data->model);
297
+}
298
+static DEVICE_ATTR_RO(model);
299
+
300
+static struct attribute *sysfs_attrs[] = {
301
+	&dev_attr_fw_version.attr,
302
+	&dev_attr_model.attr,
303
+	NULL
304
+};
305
+
306
+static struct attribute_group exc3000_attribute_group = {
307
+	.attrs = sysfs_attrs
308
+};
309
+
310
+static int exc3000_probe(struct i2c_client *client)
153
311
 {
154
312
 	struct exc3000_data *data;
155
313
 	struct input_dev *input;
156
-	int error;
314
+	int error, max_xy, retry;
157
315
 
158
316
 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
159
317
 	if (!data)
160
318
 		return -ENOMEM;
161
319
 
162
320
 	data->client = client;
321
+	data->info = device_get_match_data(&client->dev);
322
+	if (!data->info) {
323
+		enum eeti_dev_id eeti_dev_id =
324
+			i2c_match_id(exc3000_id, client)->driver_data;
325
+		data->info = &exc3000_info[eeti_dev_id];
326
+	}
163
327
 	timer_setup(&data->timer, exc3000_timer, 0);
328
+	init_completion(&data->wait_event);
329
+	mutex_init(&data->query_lock);
330
+
331
+	data->reset = devm_gpiod_get_optional(&client->dev, "reset",
332
+					      GPIOD_OUT_HIGH);
333
+	if (IS_ERR(data->reset))
334
+		return PTR_ERR(data->reset);
335
+
336
+	if (data->reset) {
337
+		msleep(EXC3000_RESET_MS);
338
+		gpiod_set_value_cansleep(data->reset, 0);
339
+		msleep(EXC3000_READY_MS);
340
+	}
164
341
 
165
342
 	input = devm_input_allocate_device(&client->dev);
166
343
 	if (!input)
167
344
 		return -ENOMEM;
168
345
 
169
346
 	data->input = input;
347
+	input_set_drvdata(input, data);
170
348
 
171
-	input->name = "EETI EXC3000 Touch Screen";
349
+	input->name = data->info->name;
172
350
 	input->id.bustype = BUS_I2C;
173
351
 
174
-	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
175
-	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
352
+	max_xy = data->info->max_xy;
353
+	input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
354
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
355
+
176
356
 	touchscreen_parse_properties(input, true, &data->prop);
177
357
 
178
358
 	error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
..
..
@@ -190,18 +370,49 @@
190
370
 	if (error)
191
371
 		return error;
192
372
 
373
+	/*
374
+	 * I²C does not have built-in recovery, so retry on failure. This
375
+	 * ensures, that the device probe will not fail for temporary issues
376
+	 * on the bus.  This is not needed for the sysfs calls (userspace
377
+	 * will receive the error code and can start another query) and
378
+	 * cannot be done for touch events (but that only means loosing one
379
+	 * or two touch events anyways).
380
+	 */
381
+	for (retry = 0; retry < 3; retry++) {
382
+		error = exc3000_get_model(data);
383
+		if (!error)
384
+			break;
385
+		dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
386
+			 retry + 1, error);
387
+	}
388
+
389
+	if (error)
390
+		return error;
391
+
392
+	dev_dbg(&client->dev, "TS Model: %s", data->model);
393
+
394
+	i2c_set_clientdata(client, data);
395
+
396
+	error = devm_device_add_group(&client->dev, &exc3000_attribute_group);
397
+	if (error)
398
+		return error;
399
+
193
400
 	return 0;
194
401
 }
195
402
 
196
403
 static const struct i2c_device_id exc3000_id[] = {
197
-	{ "exc3000", 0 },
404
+	{ "exc3000", EETI_EXC3000 },
405
+	{ "exc80h60", EETI_EXC80H60 },
406
+	{ "exc80h84", EETI_EXC80H84 },
198
407
 	{ }
199
408
 };
200
409
 MODULE_DEVICE_TABLE(i2c, exc3000_id);
201
410
 
202
411
 #ifdef CONFIG_OF
203
412
 static const struct of_device_id exc3000_of_match[] = {
204
-	{ .compatible = "eeti,exc3000" },
413
+	{ .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
414
+	{ .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
415
+	{ .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
205
416
 	{ }
206
417
 };
207
418
 MODULE_DEVICE_TABLE(of, exc3000_of_match);
..
..
@@ -213,7 +424,7 @@
213
424
 		.of_match_table = of_match_ptr(exc3000_of_match),
214
425
 	},
215
426
 	.id_table	= exc3000_id,
216
-	.probe		= exc3000_probe,
427
+	.probe_new	= exc3000_probe,
217
428
 };
218
429
 
219
430
 module_i2c_driver(exc3000_driver);