1 // SPDX-License-Identifier: GPL-2.0-only
10 #include <linux/delay.h>
14 #include <linux/spi/spi.h>
25 /* The MSB for the spi commands */
67  * struct adxrs450_state - device instance specific data
68  * @us:			actual spi_device
69  * @buf_lock:		mutex to protect tx and rx
71  * @rx:			receive buffer
74 	struct spi_device	*us;  member
77 	__be32			rx;  member
82  * adxrs450_spi_read_reg_16() - read 2 bytes from a register pair
97 			.tx_buf = &st->tx,  in adxrs450_spi_read_reg_16()
98 			.len = sizeof(st->tx),  in adxrs450_spi_read_reg_16()
101 			.rx_buf = &st->rx,  in adxrs450_spi_read_reg_16()
102 			.len = sizeof(st->rx),  in adxrs450_spi_read_reg_16()
106 	mutex_lock(&st->buf_lock);  in adxrs450_spi_read_reg_16()
112 	st->tx = cpu_to_be32(tx);  in adxrs450_spi_read_reg_16()
113 	ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));  in adxrs450_spi_read_reg_16()
115 		dev_err(&st->us->dev, "problem while reading 16 bit register 0x%02x\n",  in adxrs450_spi_read_reg_16()
120 	*val = (be32_to_cpu(st->rx) >> 5) & 0xFFFF;  in adxrs450_spi_read_reg_16()
123 	mutex_unlock(&st->buf_lock);  in adxrs450_spi_read_reg_16()
128  * adxrs450_spi_write_reg_16() - write 2 bytes data to a register pair
142 	mutex_lock(&st->buf_lock);  in adxrs450_spi_write_reg_16()
148 	st->tx = cpu_to_be32(tx);  in adxrs450_spi_write_reg_16()
149 	ret = spi_write(st->us, &st->tx, sizeof(st->tx));  in adxrs450_spi_write_reg_16()
151 		dev_err(&st->us->dev, "problem while writing 16 bit register 0x%02x\n",  in adxrs450_spi_write_reg_16()
153 	usleep_range(100, 1000); /* enforce sequential transfer delay 0.1ms */  in adxrs450_spi_write_reg_16()
154 	mutex_unlock(&st->buf_lock);  in adxrs450_spi_write_reg_16()
159  * adxrs450_spi_sensor_data() - read 2 bytes sensor data
169 			.tx_buf = &st->tx,  in adxrs450_spi_sensor_data()
170 			.len = sizeof(st->tx),  in adxrs450_spi_sensor_data()
173 			.rx_buf = &st->rx,  in adxrs450_spi_sensor_data()
174 			.len = sizeof(st->rx),  in adxrs450_spi_sensor_data()
178 	mutex_lock(&st->buf_lock);  in adxrs450_spi_sensor_data()
179 	st->tx = cpu_to_be32(ADXRS450_SENSOR_DATA);  in adxrs450_spi_sensor_data()
181 	ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));  in adxrs450_spi_sensor_data()
183 		dev_err(&st->us->dev, "Problem while reading sensor data\n");  in adxrs450_spi_sensor_data()
187 	*val = (be32_to_cpu(st->rx) >> 10) & 0xFFFF;  in adxrs450_spi_sensor_data()
190 	mutex_unlock(&st->buf_lock);  in adxrs450_spi_sensor_data()
195  * adxrs450_spi_initial() - use for initializing procedure.
206 		.tx_buf = &st->tx,  in adxrs450_spi_initial()
207 		.rx_buf = &st->rx,  in adxrs450_spi_initial()
208 		.len = sizeof(st->tx),  in adxrs450_spi_initial()
211 	mutex_lock(&st->buf_lock);  in adxrs450_spi_initial()
215 	st->tx = cpu_to_be32(tx);  in adxrs450_spi_initial()
216 	ret = spi_sync_transfer(st->us, &xfers, 1);  in adxrs450_spi_initial()
218 		dev_err(&st->us->dev, "Problem while reading initializing data\n");  in adxrs450_spi_initial()
222 	*val = be32_to_cpu(st->rx);  in adxrs450_spi_initial()
225 	mutex_unlock(&st->buf_lock);  in adxrs450_spi_initial()
242 		dev_warn(&st->us->dev, "The initial power on response is not correct! Restart without reset?\n");  in adxrs450_initial_setup()
254 		dev_err(&st->us->dev, "The second response is not correct!\n");  in adxrs450_initial_setup()
255 		return -EIO;  in adxrs450_initial_setup()
262 		dev_err(&st->us->dev, "The third response is not correct!\n");  in adxrs450_initial_setup()
263 		return -EIO;  in adxrs450_initial_setup()
270 		dev_err(&st->us->dev, "The device is not in normal status!\n");  in adxrs450_initial_setup()
271 		return -EINVAL;  in adxrs450_initial_setup()
286 		if (val < -0x400 || val >= 0x400)  in adxrs450_write_raw()
287 			return -EINVAL;  in adxrs450_write_raw()
292 		ret = -EINVAL;  in adxrs450_write_raw()
309 		switch (chan->type) {  in adxrs450_read_raw()
326 			ret = -EINVAL;  in adxrs450_read_raw()
331 		switch (chan->type) {  in adxrs450_read_raw()
341 			return -EINVAL;  in adxrs450_read_raw()
358 		ret = -EINVAL;  in adxrs450_read_raw()
406 static int adxrs450_probe(struct spi_device *spi)  in adxrs450_probe()  argument
413 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in adxrs450_probe()
415 		return -ENOMEM;  in adxrs450_probe()
417 	st->us = spi;  in adxrs450_probe()
418 	mutex_init(&st->buf_lock);  in adxrs450_probe()
420 	spi_set_drvdata(spi, indio_dev);  in adxrs450_probe()
422 	indio_dev->info = &adxrs450_info;  in adxrs450_probe()
423 	indio_dev->modes = INDIO_DIRECT_MODE;  in adxrs450_probe()
424 	indio_dev->channels =  in adxrs450_probe()
425 		adxrs450_channels[spi_get_device_id(spi)->driver_data];  in adxrs450_probe()
426 	indio_dev->num_channels = ARRAY_SIZE(adxrs450_channels);  in adxrs450_probe()
427 	indio_dev->name = spi->dev.driver->name;  in adxrs450_probe()
429 	ret = devm_iio_device_register(&spi->dev, indio_dev);  in adxrs450_probe()
446 MODULE_DEVICE_TABLE(spi, adxrs450_id);
458 MODULE_DESCRIPTION("Analog Devices ADXRS450/ADXRS453 Gyroscope SPI driver");