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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/staging/iio/cdc/ad7150.c
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@@ -1,9 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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  * AD7150 capacitive sensor driver supporting AD7150/1/6
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  *
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  * Copyright 2010-2011 Analog Devices Inc.
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- *
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- * Licensed under the GPL-2 or later.
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  */
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 #include <linux/bitfield.h>
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@@ -46,6 +45,9 @@
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 #define AD7150_SN1                 21
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 #define AD7150_SN0                 22
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 #define AD7150_ID                  23
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+
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+/* AD7150 masks */
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+#define AD7150_THRESHTYPE_MSK			GENMASK(6, 5)
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 /**
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  * struct ad7150_chip_info - instance specific chip data
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@@ -103,18 +105,19 @@
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 {
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 	int ret;
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 	struct ad7150_chip_info *chip = iio_priv(indio_dev);
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+	int channel = chan->channel;
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 	switch (mask) {
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 	case IIO_CHAN_INFO_RAW:
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 		ret = i2c_smbus_read_word_data(chip->client,
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-					ad7150_addresses[chan->channel][0]);
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+					       ad7150_addresses[channel][0]);
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 		if (ret < 0)
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 			return ret;
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 		*val = swab16(ret);
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 		return IIO_VAL_INT;
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 	case IIO_CHAN_INFO_AVERAGE_RAW:
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 		ret = i2c_smbus_read_word_data(chip->client,
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-					ad7150_addresses[chan->channel][1]);
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+					       ad7150_addresses[channel][1]);
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 		if (ret < 0)
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 			return ret;
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 		*val = swab16(ret);
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@@ -138,7 +141,7 @@
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 	if (ret < 0)
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 		return ret;
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-	threshtype = (ret >> 5) & 0x03;
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+	threshtype = FIELD_GET(AD7150_THRESHTYPE_MSK, ret);
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 	/*check if threshold mode is fixed or adaptive*/
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 	thrfixed = FIELD_GET(AD7150_CFG_FIX, ret);
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@@ -162,7 +165,8 @@
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 	return -EINVAL;
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 }
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-/* lock should be held */
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+/* state_lock should be held to ensure consistent state*/
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+
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 static int ad7150_write_event_params(struct iio_dev *indio_dev,
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 				     unsigned int chan,
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 				     enum iio_event_type type,
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@@ -185,8 +189,8 @@
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 	case IIO_EV_TYPE_THRESH:
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 		value = chip->threshold[rising][chan];
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 		return i2c_smbus_write_word_data(chip->client,
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-						ad7150_addresses[chan][3],
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-						swab16(value));
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+						 ad7150_addresses[chan][3],
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+						 swab16(value));
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 	case IIO_EV_TYPE_MAG_ADAPTIVE:
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 		sens = chip->mag_sensitivity[rising][chan];
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 		timeout = chip->mag_timeout[rising][chan];
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@@ -201,16 +205,11 @@
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 	ret = i2c_smbus_write_byte_data(chip->client,
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 					ad7150_addresses[chan][4],
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 					sens);
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-	if (ret < 0)
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+	if (ret)
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 		return ret;
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-
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-	ret = i2c_smbus_write_byte_data(chip->client,
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+	return i2c_smbus_write_byte_data(chip->client,
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 					ad7150_addresses[chan][5],
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 					timeout);
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-	if (ret < 0)
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-		return ret;
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-
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-	return 0;
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 }
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 static int ad7150_write_event_config(struct iio_dev *indio_dev,
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@@ -353,8 +352,8 @@
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 	/* use the event code for consistency reasons */
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 	int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
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-	int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
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-			== IIO_EV_DIR_RISING);
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+	int rising = (IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
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+		      == IIO_EV_DIR_RISING) ? 1 : 0;
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 	switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
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 	case IIO_EV_TYPE_MAG_ADAPTIVE:
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@@ -468,29 +467,20 @@
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 	},
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 };
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469
 
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-static const struct iio_chan_spec ad7150_channels[] = {
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-	{
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-		.type = IIO_CAPACITANCE,
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-		.indexed = 1,
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-		.channel = 0,
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-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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-		BIT(IIO_CHAN_INFO_AVERAGE_RAW),
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-		.event_spec = ad7150_events,
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-		.num_event_specs = ARRAY_SIZE(ad7150_events),
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-	}, {
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-		.type = IIO_CAPACITANCE,
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-		.indexed = 1,
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-		.channel = 1,
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-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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-		BIT(IIO_CHAN_INFO_AVERAGE_RAW),
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-		.event_spec = ad7150_events,
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-		.num_event_specs = ARRAY_SIZE(ad7150_events),
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-	},
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-};
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+#define AD7150_CAPACITANCE_CHAN(_chan)	{			\
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+		.type = IIO_CAPACITANCE,			\
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+		.indexed = 1,					\
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+		.channel = _chan,				\
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+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
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+		BIT(IIO_CHAN_INFO_AVERAGE_RAW),			\
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+		.event_spec = ad7150_events,			\
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+		.num_event_specs = ARRAY_SIZE(ad7150_events),	\
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+	}
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-/*
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- * threshold events
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- */
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+static const struct iio_chan_spec ad7150_channels[] = {
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+	AD7150_CAPACITANCE_CHAN(0),
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+	AD7150_CAPACITANCE_CHAN(1)
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+};
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 static irqreturn_t ad7150_event_handler(int irq, void *private)
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 {
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@@ -580,10 +570,6 @@
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 	.write_event_value = &ad7150_write_event_value,
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 };
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-/*
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- * device probe and remove
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- */
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-
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 static int ad7150_probe(struct i2c_client *client,
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 			const struct i2c_device_id *id)
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 {
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@@ -604,8 +590,6 @@
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 	indio_dev->name = id->name;
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 	indio_dev->channels = ad7150_channels;
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 	indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
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-	/* Establish that the iio_dev is a child of the i2c device */
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-	indio_dev->dev.parent = &client->dev;
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 	indio_dev->info = &ad7150_info;
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