add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/drivers/iio/chemical/ccs811.c
..
..
@@ -1,13 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
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2
 /*
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  * ccs811.c - Support for AMS CCS811 VOC Sensor
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  *
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  * Copyright (C) 2017 Narcisa Vasile <narcisaanamaria12@gmail.com>
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  *
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  * Datasheet: ams.com/content/download/951091/2269479/CCS811_DS000459_3-00.pdf
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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8
  *
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9
  * IIO driver for AMS CCS811 (I2C address 0x5A/0x5B set by ADDR Low/High)
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10
  *
..
..
@@ -19,6 +16,7 @@
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16
  */
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17
 
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 #include <linux/delay.h>
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+#include <linux/gpio/consumer.h>
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 #include <linux/i2c.h>
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21
 #include <linux/iio/iio.h>
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22
 #include <linux/iio/buffer.h>
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..
@@ -39,6 +37,7 @@
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 #define CCS811_ERR		0xE0
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 /* Used to transition from boot to application mode */
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 #define CCS811_APP_START	0xF4
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+#define CCS811_SW_RESET		0xFF
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41
 
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 /* Status register flags */
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 #define CCS811_STATUS_ERROR		BIT(0)
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@@ -77,6 +76,7 @@
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 	struct mutex lock; /* Protect readings */
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 	struct ccs811_reading buffer;
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 	struct iio_trigger *drdy_trig;
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+	struct gpio_desc *wakeup_gpio;
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 	bool drdy_trig_on;
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 	/* Ensures correct alignment of timestamp if present */
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 	struct {
..
..
@@ -174,9 +174,24 @@
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 					 CCS811_MODE_IAQ_1SEC);
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 }
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176
 
177
+static void ccs811_set_wakeup(struct ccs811_data *data, bool enable)
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+{
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+	if (!data->wakeup_gpio)
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+		return;
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+
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+	gpiod_set_value(data->wakeup_gpio, enable);
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+
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+	if (enable)
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+		usleep_range(50, 60);
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+	else
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+		usleep_range(20, 30);
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+}
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+
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 static int ccs811_get_measurement(struct ccs811_data *data)
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 {
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 	int ret, tries = 11;
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+
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+	ccs811_set_wakeup(data, true);
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195
 
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 	/* Maximum waiting time: 1s, as measurements are made every second */
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197
 	while (tries-- > 0) {
..
..
@@ -191,9 +206,12 @@
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 	if (!(ret & CCS811_STATUS_DATA_READY))
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 		return -EIO;
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208
 
194
-	return i2c_smbus_read_i2c_block_data(data->client,
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+	ret = i2c_smbus_read_i2c_block_data(data->client,
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210
 					    CCS811_ALG_RESULT_DATA, 8,
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211
 					    (char *)&data->buffer);
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+	ccs811_set_wakeup(data, false);
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+
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+	return ret;
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215
 }
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216
 
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 static int ccs811_read_raw(struct iio_dev *indio_dev,
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@@ -344,6 +362,45 @@
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362
 	return IRQ_HANDLED;
345
363
 }
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364
 
365
+static int ccs811_reset(struct i2c_client *client)
366
+{
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+	struct gpio_desc *reset_gpio;
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+	int ret;
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+
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+	reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
371
+					     GPIOD_OUT_LOW);
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+	if (IS_ERR(reset_gpio))
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+		return PTR_ERR(reset_gpio);
374
+
375
+	/* Try to reset using nRESET pin if available else do SW reset */
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+	if (reset_gpio) {
377
+		gpiod_set_value(reset_gpio, 1);
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+		usleep_range(20, 30);
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+		gpiod_set_value(reset_gpio, 0);
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+	} else {
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+		/*
382
+		 * As per the datasheet, this sequence of values needs to be
383
+		 * written to the SW_RESET register for triggering the soft
384
+		 * reset in the device and placing it in boot mode.
385
+		 */
386
+		static const u8 reset_seq[] = {
387
+			0x11, 0xE5, 0x72, 0x8A,
388
+		};
389
+
390
+		ret = i2c_smbus_write_i2c_block_data(client, CCS811_SW_RESET,
391
+					     sizeof(reset_seq), reset_seq);
392
+		if (ret < 0) {
393
+			dev_err(&client->dev, "Failed to reset sensor\n");
394
+			return ret;
395
+		}
396
+	}
397
+
398
+	/* tSTART delay required after reset */
399
+	usleep_range(1000, 2000);
400
+
401
+	return 0;
402
+}
403
+
347
404
 static int ccs811_probe(struct i2c_client *client,
348
405
 			const struct i2c_device_id *id)
349
406
 {
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@@ -356,40 +413,62 @@
356
413
 				     | I2C_FUNC_SMBUS_READ_I2C_BLOCK))
357
414
 		return -EOPNOTSUPP;
358
415
 
359
-	/* Check hardware id (should be 0x81 for this family of devices) */
360
-	ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
361
-	if (ret < 0)
362
-		return ret;
363
-
364
-	if (ret != CCS811_HW_ID_VALUE) {
365
-		dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
366
-		return -ENODEV;
367
-	}
368
-
369
-	ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
370
-	if (ret < 0)
371
-		return ret;
372
-
373
-	if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
374
-		dev_err(&client->dev, "no CCS811 sensor\n");
375
-		return -ENODEV;
376
-	}
377
-
378
416
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
379
417
 	if (!indio_dev)
380
418
 		return -ENOMEM;
381
-
382
-	ret = ccs811_setup(client);
383
-	if (ret < 0)
384
-		return ret;
385
419
 
386
420
 	data = iio_priv(indio_dev);
387
421
 	i2c_set_clientdata(client, indio_dev);
388
422
 	data->client = client;
389
423
 
424
+	data->wakeup_gpio = devm_gpiod_get_optional(&client->dev, "wakeup",
425
+						    GPIOD_OUT_HIGH);
426
+	if (IS_ERR(data->wakeup_gpio))
427
+		return PTR_ERR(data->wakeup_gpio);
428
+
429
+	ccs811_set_wakeup(data, true);
430
+
431
+	ret = ccs811_reset(client);
432
+	if (ret) {
433
+		ccs811_set_wakeup(data, false);
434
+		return ret;
435
+	}
436
+
437
+	/* Check hardware id (should be 0x81 for this family of devices) */
438
+	ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
439
+	if (ret < 0) {
440
+		ccs811_set_wakeup(data, false);
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+		return ret;
442
+	}
443
+
444
+	if (ret != CCS811_HW_ID_VALUE) {
445
+		dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
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+		ccs811_set_wakeup(data, false);
447
+		return -ENODEV;
448
+	}
449
+
450
+	ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
451
+	if (ret < 0) {
452
+		ccs811_set_wakeup(data, false);
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+		return ret;
454
+	}
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+
456
+	if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
457
+		dev_err(&client->dev, "no CCS811 sensor\n");
458
+		ccs811_set_wakeup(data, false);
459
+		return -ENODEV;
460
+	}
461
+
462
+	ret = ccs811_setup(client);
463
+	if (ret < 0) {
464
+		ccs811_set_wakeup(data, false);
465
+		return ret;
466
+	}
467
+
468
+	ccs811_set_wakeup(data, false);
469
+
390
470
 	mutex_init(&data->lock);
391
471
 
392
-	indio_dev->dev.parent = &client->dev;
393
472
 	indio_dev->name = id->name;
394
473
 	indio_dev->info = &ccs811_info;
395
474
 	indio_dev->modes = INDIO_DIRECT_MODE;
..
..
@@ -421,11 +500,11 @@
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500
 		data->drdy_trig->dev.parent = &client->dev;
422
501
 		data->drdy_trig->ops = &ccs811_trigger_ops;
423
502
 		iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
424
-		indio_dev->trig = data->drdy_trig;
425
-		iio_trigger_get(indio_dev->trig);
426
503
 		ret = iio_trigger_register(data->drdy_trig);
427
504
 		if (ret)
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505
 			goto err_poweroff;
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+
507
+		indio_dev->trig = iio_trigger_get(data->drdy_trig);
429
508
 	}
430
509
 
431
510
 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
..
..
@@ -474,9 +553,16 @@
474
553
 };
475
554
 MODULE_DEVICE_TABLE(i2c, ccs811_id);
476
555
 
556
+static const struct of_device_id ccs811_dt_ids[] = {
557
+	{ .compatible = "ams,ccs811" },
558
+	{ }
559
+};
560
+MODULE_DEVICE_TABLE(of, ccs811_dt_ids);
561
+
477
562
 static struct i2c_driver ccs811_driver = {
478
563
 	.driver = {
479
564
 		.name = "ccs811",
565
+		.of_match_table = ccs811_dt_ids,
480
566
 	},
481
567
 	.probe = ccs811_probe,
482
568
 	.remove = ccs811_remove,