forked from ~ljy/RK356X_SDK_RELEASE

blame | history | patch | commit | commitdiff
hc
2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/drivers/input/touchscreen/sx8654.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Driver for Semtech SX8654 I2C touchscreen controller.
34  *
....@@ -21,18 +22,18 @@
2122  *      Copyright (C) 2002 MontaVista Software
2223  *      Copyright (C) 2004 Texas Instruments
2324  *      Copyright (C) 2005 Dirk Behme
24
- *
25
- *  This program is free software; you can redistribute it and/or modify
26
- *  it under the terms of the GNU General Public License version 2 as
27
- *  published by the Free Software Foundation.
2825  */
2926 
30
-#include <linux/input.h>
31
-#include <linux/module.h>
32
-#include <linux/of.h>
27
+#include <linux/bitops.h>
28
+#include <linux/delay.h>
29
+#include <linux/gpio/consumer.h>
3330 #include <linux/i2c.h>
31
+#include <linux/input.h>
32
+#include <linux/input/touchscreen.h>
3433 #include <linux/interrupt.h>
3534 #include <linux/irq.h>
35
+#include <linux/module.h>
36
+#include <linux/of.h>
3637 
3738 /* register addresses */
3839 #define I2C_REG_TOUCH0			0x00
....@@ -42,25 +43,28 @@
4243 #define I2C_REG_IRQSRC			0x23
4344 #define I2C_REG_SOFTRESET		0x3f
4445 
46
+#define I2C_REG_SX8650_STAT		0x05
47
+#define SX8650_STAT_CONVIRQ		BIT(7)
48
+
4549 /* commands */
4650 #define CMD_READ_REGISTER		0x40
47
-#define CMD_MANUAL			0xc0
4851 #define CMD_PENTRG			0xe0
4952 
5053 /* value for I2C_REG_SOFTRESET */
5154 #define SOFTRESET_VALUE			0xde
5255 
5356 /* bits for I2C_REG_IRQSRC */
54
-#define IRQ_PENTOUCH_TOUCHCONVDONE	0x08
55
-#define IRQ_PENRELEASE			0x04
57
+#define IRQ_PENTOUCH_TOUCHCONVDONE	BIT(3)
58
+#define IRQ_PENRELEASE			BIT(2)
5659 
5760 /* bits for RegTouch1 */
5861 #define CONDIRQ				0x20
62
+#define RPDNT_100K			0x00
5963 #define FILT_7SA			0x03
6064 
6165 /* bits for I2C_REG_CHANMASK */
62
-#define CONV_X				0x80
63
-#define CONV_Y				0x40
66
+#define CONV_X				BIT(7)
67
+#define CONV_Y				BIT(6)
6468 
6569 /* coordinates rate: higher nibble of CTRL0 register */
6670 #define RATE_MANUAL			0x00
....@@ -69,12 +73,121 @@
6973 /* power delay: lower nibble of CTRL0 register */
7074 #define POWDLY_1_1MS			0x0b
7175 
76
+/* for sx8650, as we have no pen release IRQ there: timeout in ns following the
77
+ * last PENIRQ after which we assume the pen is lifted.
78
+ */
79
+#define SX8650_PENIRQ_TIMEOUT		msecs_to_jiffies(10)
80
+
7281 #define MAX_12BIT			((1 << 12) - 1)
82
+#define MAX_I2C_READ_LEN		10 /* see datasheet section 5.1.5 */
83
+
84
+/* channel definition */
85
+#define CH_X				0x00
86
+#define CH_Y				0x01
87
+
88
+struct sx865x_data {
89
+	u8 cmd_manual;
90
+	u8 chan_mask;
91
+	bool has_irq_penrelease;
92
+	bool has_reg_irqmask;
93
+	irq_handler_t irqh;
94
+};
7395 
7496 struct sx8654 {
7597 	struct input_dev *input;
7698 	struct i2c_client *client;
99
+	struct gpio_desc *gpio_reset;
100
+
101
+	spinlock_t lock;	/* for input reporting from irq/timer */
102
+	struct timer_list timer;
103
+
104
+	struct touchscreen_properties props;
105
+
106
+	const struct sx865x_data *data;
77107 };
108
+
109
+static inline void sx865x_penrelease(struct sx8654 *ts)
110
+{
111
+	struct input_dev *input_dev = ts->input;
112
+
113
+	input_report_key(input_dev, BTN_TOUCH, 0);
114
+	input_sync(input_dev);
115
+}
116
+
117
+static void sx865x_penrelease_timer_handler(struct timer_list *t)
118
+{
119
+	struct sx8654 *ts = from_timer(ts, t, timer);
120
+	unsigned long flags;
121
+
122
+	spin_lock_irqsave(&ts->lock, flags);
123
+	sx865x_penrelease(ts);
124
+	spin_unlock_irqrestore(&ts->lock, flags);
125
+	dev_dbg(&ts->client->dev, "penrelease by timer\n");
126
+}
127
+
128
+static irqreturn_t sx8650_irq(int irq, void *handle)
129
+{
130
+	struct sx8654 *ts = handle;
131
+	struct device *dev = &ts->client->dev;
132
+	int len, i;
133
+	unsigned long flags;
134
+	u8 stat;
135
+	u16 x, y;
136
+	u16 ch;
137
+	u16 chdata;
138
+	__be16 data[MAX_I2C_READ_LEN / sizeof(__be16)];
139
+	u8 nchan = hweight32(ts->data->chan_mask);
140
+	u8 readlen = nchan * sizeof(*data);
141
+
142
+	stat = i2c_smbus_read_byte_data(ts->client, CMD_READ_REGISTER
143
+						    | I2C_REG_SX8650_STAT);
144
+
145
+	if (!(stat & SX8650_STAT_CONVIRQ)) {
146
+		dev_dbg(dev, "%s ignore stat [0x%02x]", __func__, stat);
147
+		return IRQ_HANDLED;
148
+	}
149
+
150
+	len = i2c_master_recv(ts->client, (u8 *)data, readlen);
151
+	if (len != readlen) {
152
+		dev_dbg(dev, "ignore short recv (%d)\n", len);
153
+		return IRQ_HANDLED;
154
+	}
155
+
156
+	spin_lock_irqsave(&ts->lock, flags);
157
+
158
+	x = 0;
159
+	y = 0;
160
+	for (i = 0; i < nchan; i++) {
161
+		chdata = be16_to_cpu(data[i]);
162
+
163
+		if (unlikely(chdata == 0xFFFF)) {
164
+			dev_dbg(dev, "invalid qualified data @ %d\n", i);
165
+			continue;
166
+		} else if (unlikely(chdata & 0x8000)) {
167
+			dev_warn(dev, "hibit @ %d [0x%04x]\n", i, chdata);
168
+			continue;
169
+		}
170
+
171
+		ch = chdata >> 12;
172
+		if (ch == CH_X)
173
+			x = chdata & MAX_12BIT;
174
+		else if (ch == CH_Y)
175
+			y = chdata & MAX_12BIT;
176
+		else
177
+			dev_warn(dev, "unknown channel %d [0x%04x]\n", ch,
178
+				 chdata);
179
+	}
180
+
181
+	touchscreen_report_pos(ts->input, &ts->props, x, y, false);
182
+	input_report_key(ts->input, BTN_TOUCH, 1);
183
+	input_sync(ts->input);
184
+	dev_dbg(dev, "point(%4d,%4d)\n", x, y);
185
+
186
+	mod_timer(&ts->timer, jiffies + SX8650_PENIRQ_TIMEOUT);
187
+	spin_unlock_irqrestore(&ts->lock, flags);
188
+
189
+	return IRQ_HANDLED;
190
+}
78191 
79192 static irqreturn_t sx8654_irq(int irq, void *handle)
80193 {
....@@ -112,8 +225,8 @@
112225 		x = ((data[0] & 0xf) << 8) | (data[1]);
113226 		y = ((data[2] & 0xf) << 8) | (data[3]);
114227 
115
-		input_report_abs(sx8654->input, ABS_X, x);
116
-		input_report_abs(sx8654->input, ABS_Y, y);
228
+		touchscreen_report_pos(sx8654->input, &sx8654->props, x, y,
229
+				       false);
117230 		input_report_key(sx8654->input, BTN_TOUCH, 1);
118231 		input_sync(sx8654->input);
119232 
....@@ -122,6 +235,25 @@
122235 
123236 out:
124237 	return IRQ_HANDLED;
238
+}
239
+
240
+static int sx8654_reset(struct sx8654 *ts)
241
+{
242
+	int err;
243
+
244
+	if (ts->gpio_reset) {
245
+		gpiod_set_value_cansleep(ts->gpio_reset, 1);
246
+		udelay(2); /* Tpulse > 1µs */
247
+		gpiod_set_value_cansleep(ts->gpio_reset, 0);
248
+	} else {
249
+		dev_dbg(&ts->client->dev, "NRST unavailable, try softreset\n");
250
+		err = i2c_smbus_write_byte_data(ts->client, I2C_REG_SOFTRESET,
251
+						SOFTRESET_VALUE);
252
+		if (err)
253
+			return err;
254
+	}
255
+
256
+	return 0;
125257 }
126258 
127259 static int sx8654_open(struct input_dev *dev)
....@@ -157,14 +289,17 @@
157289 
158290 	disable_irq(client->irq);
159291 
292
+	if (!sx8654->data->has_irq_penrelease)
293
+		del_timer_sync(&sx8654->timer);
294
+
160295 	/* enable manual mode mode */
161
-	error = i2c_smbus_write_byte(client, CMD_MANUAL);
296
+	error = i2c_smbus_write_byte(client, sx8654->data->cmd_manual);
162297 	if (error) {
163298 		dev_err(&client->dev, "writing command CMD_MANUAL failed");
164299 		return;
165300 	}
166301 
167
-	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
302
+	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, RATE_MANUAL);
168303 	if (error) {
169304 		dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
170305 		return;
....@@ -186,6 +321,31 @@
186321 	if (!sx8654)
187322 		return -ENOMEM;
188323 
324
+	sx8654->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset",
325
+						     GPIOD_OUT_HIGH);
326
+	if (IS_ERR(sx8654->gpio_reset)) {
327
+		error = PTR_ERR(sx8654->gpio_reset);
328
+		if (error != -EPROBE_DEFER)
329
+			dev_err(&client->dev, "unable to get reset-gpio: %d\n",
330
+				error);
331
+		return error;
332
+	}
333
+	dev_dbg(&client->dev, "got GPIO reset pin\n");
334
+
335
+	sx8654->data = device_get_match_data(&client->dev);
336
+	if (!sx8654->data)
337
+		sx8654->data = (const struct sx865x_data *)id->driver_data;
338
+	if (!sx8654->data) {
339
+		dev_err(&client->dev, "invalid or missing device data\n");
340
+		return -EINVAL;
341
+	}
342
+
343
+	if (!sx8654->data->has_irq_penrelease) {
344
+		dev_dbg(&client->dev, "use timer for penrelease\n");
345
+		timer_setup(&sx8654->timer, sx865x_penrelease_timer_handler, 0);
346
+		spin_lock_init(&sx8654->lock);
347
+	}
348
+
189349 	input = devm_input_allocate_device(&client->dev);
190350 	if (!input)
191351 		return -ENOMEM;
....@@ -201,43 +361,46 @@
201361 	input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
202362 	input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
203363 
364
+	touchscreen_parse_properties(input, false, &sx8654->props);
365
+
204366 	sx8654->client = client;
205367 	sx8654->input = input;
206368 
207369 	input_set_drvdata(sx8654->input, sx8654);
208370 
209
-	error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
210
-					  SOFTRESET_VALUE);
371
+	error = sx8654_reset(sx8654);
211372 	if (error) {
212
-		dev_err(&client->dev, "writing softreset value failed");
373
+		dev_err(&client->dev, "reset failed");
213374 		return error;
214375 	}
215376 
216377 	error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
217
-					  CONV_X | CONV_Y);
378
+					  sx8654->data->chan_mask);
218379 	if (error) {
219380 		dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
220381 		return error;
221382 	}
222383 
223
-	error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
224
-					  IRQ_PENTOUCH_TOUCHCONVDONE |
225
-						IRQ_PENRELEASE);
226
-	if (error) {
227
-		dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
228
-		return error;
384
+	if (sx8654->data->has_reg_irqmask) {
385
+		error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
386
+						  IRQ_PENTOUCH_TOUCHCONVDONE |
387
+							IRQ_PENRELEASE);
388
+		if (error) {
389
+			dev_err(&client->dev, "writing I2C_REG_IRQMASK failed");
390
+			return error;
391
+		}
229392 	}
230393 
231394 	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
232
-					  CONDIRQ | FILT_7SA);
395
+					  CONDIRQ | RPDNT_100K | FILT_7SA);
233396 	if (error) {
234397 		dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
235398 		return error;
236399 	}
237400 
238401 	error = devm_request_threaded_irq(&client->dev, client->irq,
239
-					  NULL, sx8654_irq,
240
-					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
402
+					  NULL, sx8654->data->irqh,
403
+					  IRQF_ONESHOT,
241404 					  client->name, sx8654);
242405 	if (error) {
243406 		dev_err(&client->dev,
....@@ -256,17 +419,48 @@
256419 	return 0;
257420 }
258421 
422
+static const struct sx865x_data sx8650_data = {
423
+	.cmd_manual		= 0xb0,
424
+	.has_irq_penrelease	= false,
425
+	.has_reg_irqmask	= false,
426
+	.chan_mask		= (CONV_X | CONV_Y),
427
+	.irqh			= sx8650_irq,
428
+};
429
+
430
+static const struct sx865x_data sx8654_data = {
431
+	.cmd_manual		= 0xc0,
432
+	.has_irq_penrelease	= true,
433
+	.has_reg_irqmask	= true,
434
+	.chan_mask		= (CONV_X | CONV_Y),
435
+	.irqh			= sx8654_irq,
436
+};
437
+
259438 #ifdef CONFIG_OF
260439 static const struct of_device_id sx8654_of_match[] = {
261
-	{ .compatible = "semtech,sx8654", },
262
-	{ },
440
+	{
441
+		.compatible = "semtech,sx8650",
442
+		.data = &sx8650_data,
443
+	}, {
444
+		.compatible = "semtech,sx8654",
445
+		.data = &sx8654_data,
446
+	}, {
447
+		.compatible = "semtech,sx8655",
448
+		.data = &sx8654_data,
449
+	}, {
450
+		.compatible = "semtech,sx8656",
451
+		.data = &sx8654_data,
452
+	},
453
+	{ }
263454 };
264455 MODULE_DEVICE_TABLE(of, sx8654_of_match);
265456 #endif
266457 
267458 static const struct i2c_device_id sx8654_id_table[] = {
268
-	{ "semtech_sx8654", 0 },
269
-	{ },
459
+	{ .name = "semtech_sx8650", .driver_data = (long)&sx8650_data },
460
+	{ .name = "semtech_sx8654", .driver_data = (long)&sx8654_data },
461
+	{ .name = "semtech_sx8655", .driver_data = (long)&sx8654_data },
462
+	{ .name = "semtech_sx8656", .driver_data = (long)&sx8654_data },
463
+	{ }
270464 };
271465 MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
272466