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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/hwmon/shtc1.c
....@@ -1,18 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* Sensirion SHTC1 humidity and temperature sensor driver
23  *
34  * Copyright (C) 2014 Sensirion AG, Switzerland
45  * Author: Johannes Winkelmann <johannes.winkelmann@sensirion.com>
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License as published by
8
- * the Free Software Foundation; either version 2 of the License, or
9
- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
166  */
177 
188 #include <linux/module.h>
....@@ -24,6 +14,7 @@
2414 #include <linux/err.h>
2515 #include <linux/delay.h>
2616 #include <linux/platform_data/shtc1.h>
17
+#include <linux/of.h>
2718 
2819 /* commands (high precision mode) */
2920 static const unsigned char shtc1_cmd_measure_blocking_hpm[]    = { 0x7C, 0xA2 };
....@@ -34,18 +25,32 @@
3425 static const unsigned char shtc1_cmd_measure_nonblocking_lpm[] = { 0x60, 0x9c };
3526 
3627 /* command for reading the ID register */
37
-static const unsigned char shtc1_cmd_read_id_reg[]	       = { 0xef, 0xc8 };
28
+static const unsigned char shtc1_cmd_read_id_reg[]             = { 0xef, 0xc8 };
3829 
39
-/* constants for reading the ID register */
40
-#define SHTC1_ID	  0x07
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-#define SHTC1_ID_REG_MASK 0x3f
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+/*
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+ * constants for reading the ID register
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+ * SHTC1: 0x0007 with mask 0x003f
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+ * SHTW1: 0x0007 with mask 0x003f
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+ * SHTC3: 0x0807 with mask 0x083f
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+ */
36
+#define SHTC3_ID      0x0807
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+#define SHTC3_ID_MASK 0x083f
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+#define SHTC1_ID      0x0007
39
+#define SHTC1_ID_MASK 0x003f
4240 
4341 /* delays for non-blocking i2c commands, both in us */
4442 #define SHTC1_NONBLOCKING_WAIT_TIME_HPM  14400
4543 #define SHTC1_NONBLOCKING_WAIT_TIME_LPM   1000
44
+#define SHTC3_NONBLOCKING_WAIT_TIME_HPM  12100
45
+#define SHTC3_NONBLOCKING_WAIT_TIME_LPM    800
4646 
4747 #define SHTC1_CMD_LENGTH      2
4848 #define SHTC1_RESPONSE_LENGTH 6
49
+
50
+enum shtcx_chips {
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+	shtc1,
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+	shtc3,
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+};
4954 
5055 struct shtc1_data {
5156 	struct i2c_client *client;
....@@ -57,6 +62,7 @@
5762 	unsigned int nonblocking_wait_time; /* in us */
5863 
5964 	struct shtc1_platform_data setup;
65
+	enum shtcx_chips chip;
6066 
6167 	int temperature; /* 1000 * temperature in dgr C */
6268 	int humidity; /* 1000 * relative humidity in %RH */
....@@ -167,25 +173,32 @@
167173 		data->command = data->setup.blocking_io ?
168174 				shtc1_cmd_measure_blocking_hpm :
169175 				shtc1_cmd_measure_nonblocking_hpm;
170
-		data->nonblocking_wait_time = SHTC1_NONBLOCKING_WAIT_TIME_HPM;
171
-
176
+		data->nonblocking_wait_time = (data->chip == shtc1) ?
177
+				SHTC1_NONBLOCKING_WAIT_TIME_HPM :
178
+				SHTC3_NONBLOCKING_WAIT_TIME_HPM;
172179 	} else {
173180 		data->command = data->setup.blocking_io ?
174181 				shtc1_cmd_measure_blocking_lpm :
175182 				shtc1_cmd_measure_nonblocking_lpm;
176
-		data->nonblocking_wait_time = SHTC1_NONBLOCKING_WAIT_TIME_LPM;
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+		data->nonblocking_wait_time = (data->chip == shtc1) ?
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+				SHTC1_NONBLOCKING_WAIT_TIME_LPM :
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+				SHTC3_NONBLOCKING_WAIT_TIME_LPM;
177186 	}
178187 }
179188 
180
-static int shtc1_probe(struct i2c_client *client,
181
-		       const struct i2c_device_id *id)
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+static const struct i2c_device_id shtc1_id[];
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+
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+static int shtc1_probe(struct i2c_client *client)
182192 {
183193 	int ret;
184
-	char id_reg[2];
194
+	u16 id_reg;
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+	char id_reg_buf[2];
185196 	struct shtc1_data *data;
186197 	struct device *hwmon_dev;
198
+	enum shtcx_chips chip = i2c_match_id(shtc1_id, client)->driver_data;
187199 	struct i2c_adapter *adap = client->adapter;
188200 	struct device *dev = &client->dev;
201
+	struct device_node *np = dev->of_node;
189202 
190203 	if (!i2c_check_functionality(adap, I2C_FUNC_I2C)) {
191204 		dev_err(dev, "plain i2c transactions not supported\n");
....@@ -197,13 +210,20 @@
197210 		dev_err(dev, "could not send read_id_reg command: %d\n", ret);
198211 		return ret < 0 ? ret : -ENODEV;
199212 	}
200
-	ret = i2c_master_recv(client, id_reg, sizeof(id_reg));
201
-	if (ret != sizeof(id_reg)) {
213
+	ret = i2c_master_recv(client, id_reg_buf, sizeof(id_reg_buf));
214
+	if (ret != sizeof(id_reg_buf)) {
202215 		dev_err(dev, "could not read ID register: %d\n", ret);
203216 		return -ENODEV;
204217 	}
205
-	if ((id_reg[1] & SHTC1_ID_REG_MASK) != SHTC1_ID) {
206
-		dev_err(dev, "ID register doesn't match\n");
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+
219
+	id_reg = be16_to_cpup((__be16 *)id_reg_buf);
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+	if (chip == shtc3) {
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+		if ((id_reg & SHTC3_ID_MASK) != SHTC3_ID) {
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+			dev_err(dev, "SHTC3 ID register does not match\n");
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+			return -ENODEV;
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+		}
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+	} else if ((id_reg & SHTC1_ID_MASK) != SHTC1_ID) {
226
+		dev_err(dev, "SHTC1 ID register does not match\n");
207227 		return -ENODEV;
208228 	}
209229 
....@@ -214,9 +234,16 @@
214234 	data->setup.blocking_io = false;
215235 	data->setup.high_precision = true;
216236 	data->client = client;
237
+	data->chip = chip;
217238 
218
-	if (client->dev.platform_data)
219
-		data->setup = *(struct shtc1_platform_data *)dev->platform_data;
239
+	if (np) {
240
+		data->setup.blocking_io = of_property_read_bool(np, "sensirion,blocking-io");
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+		data->setup.high_precision = !of_property_read_bool(np, "sensicon,low-precision");
242
+	} else {
243
+		if (client->dev.platform_data)
244
+			data->setup = *(struct shtc1_platform_data *)dev->platform_data;
245
+	}
246
+
220247 	shtc1_select_command(data);
221248 	mutex_init(&data->update_lock);
222249 
....@@ -232,15 +259,27 @@
232259 
233260 /* device ID table */
234261 static const struct i2c_device_id shtc1_id[] = {
235
-	{ "shtc1", 0 },
236
-	{ "shtw1", 0 },
262
+	{ "shtc1", shtc1 },
263
+	{ "shtw1", shtc1 },
264
+	{ "shtc3", shtc3 },
237265 	{ }
238266 };
239267 MODULE_DEVICE_TABLE(i2c, shtc1_id);
240268 
269
+static const struct of_device_id shtc1_of_match[] = {
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+	{ .compatible = "sensirion,shtc1" },
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+	{ .compatible = "sensirion,shtw1" },
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+	{ .compatible = "sensirion,shtc3" },
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+	{ }
274
+};
275
+MODULE_DEVICE_TABLE(of, shtc1_of_match);
276
+
241277 static struct i2c_driver shtc1_i2c_driver = {
242
-	.driver.name  = "shtc1",
243
-	.probe        = shtc1_probe,
278
+	.driver = {
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+		.name = "shtc1",
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+		.of_match_table = shtc1_of_match,
281
+	},
282
+	.probe_new    = shtc1_probe,
244283 	.id_table     = shtc1_id,
245284 };
246285