251 static int sca3300_transfer(struct sca3300_data *sca_data, int *val)  in sca3300_transfer()  argument
260 			.tx_buf = sca_data->txbuf,  in sca3300_transfer()
261 			.len = ARRAY_SIZE(sca_data->txbuf),  in sca3300_transfer()
266 			.rx_buf = sca_data->rxbuf,  in sca3300_transfer()
267 			.len = ARRAY_SIZE(sca_data->rxbuf),  in sca3300_transfer()
273 	crc = ~crc8(sca3300_crc_table, &sca_data->txbuf[0], 3, CRC8_INIT_VALUE);  in sca3300_transfer()
274 	sca_data->txbuf[3] = crc;  in sca3300_transfer()
276 	ret = spi_sync_transfer(sca_data->spi, xfers, ARRAY_SIZE(xfers));  in sca3300_transfer()
278 		dev_err(&sca_data->spi->dev,  in sca3300_transfer()
283 	crc = ~crc8(sca3300_crc_table, &sca_data->rxbuf[0], 3, CRC8_INIT_VALUE);  in sca3300_transfer()
284 	if (sca_data->rxbuf[3] != crc) {  in sca3300_transfer()
285 		dev_err(&sca_data->spi->dev, "CRC checksum mismatch");  in sca3300_transfer()
290 	rs = sca_data->rxbuf[0] & SCA3300_MASK_RS_STATUS;  in sca3300_transfer()
294 	*val = sign_extend32(get_unaligned_be16(&sca_data->rxbuf[1]), 15);  in sca3300_transfer()
299 static int sca3300_error_handler(struct sca3300_data *sca_data)  in sca3300_error_handler()  argument
304 	mutex_lock(&sca_data->lock);  in sca3300_error_handler()
305 	sca_data->txbuf[0] = SCA3300_REG_STATUS << 2;  in sca3300_error_handler()
306 	ret = sca3300_transfer(sca_data, &val);  in sca3300_error_handler()
307 	mutex_unlock(&sca_data->lock);  in sca3300_error_handler()
313 		dev_err(&sca_data->spi->dev,  in sca3300_error_handler()
318 	dev_err(&sca_data->spi->dev, "device status: 0x%lx\n",  in sca3300_error_handler()
324 static int sca3300_read_reg(struct sca3300_data *sca_data, u8 reg, int *val)  in sca3300_read_reg()  argument
328 	mutex_lock(&sca_data->lock);  in sca3300_read_reg()
329 	sca_data->txbuf[0] = reg << 2;  in sca3300_read_reg()
330 	ret = sca3300_transfer(sca_data, val);  in sca3300_read_reg()
331 	mutex_unlock(&sca_data->lock);  in sca3300_read_reg()
335 	return sca3300_error_handler(sca_data);  in sca3300_read_reg()
338 static int sca3300_write_reg(struct sca3300_data *sca_data, u8 reg, int val)  in sca3300_write_reg()  argument
343 	mutex_lock(&sca_data->lock);  in sca3300_write_reg()
345 	sca_data->txbuf[0] = BIT(7) | (reg << 2);  in sca3300_write_reg()
346 	put_unaligned_be16(val, &sca_data->txbuf[1]);  in sca3300_write_reg()
347 	ret = sca3300_transfer(sca_data, &reg_val);  in sca3300_write_reg()
348 	mutex_unlock(&sca_data->lock);  in sca3300_write_reg()
352 	return sca3300_error_handler(sca_data);  in sca3300_write_reg()
355 static int sca3300_set_op_mode(struct sca3300_data *sca_data, int index)  in sca3300_set_op_mode()  argument
357 	if ((index < 0) || (index >= sca_data->chip->num_avail_modes))  in sca3300_set_op_mode()
360 	return sca3300_write_reg(sca_data, SCA3300_REG_MODE,  in sca3300_set_op_mode()
361 				 sca_data->chip->avail_modes_table[index]);  in sca3300_set_op_mode()
364 static int sca3300_get_op_mode(struct sca3300_data *sca_data, int *index)  in sca3300_get_op_mode()  argument
370 	ret = sca3300_read_reg(sca_data, SCA3300_REG_MODE, &reg_val);  in sca3300_get_op_mode()
374 	for (i = 0; i < sca_data->chip->num_avail_modes; i++) {  in sca3300_get_op_mode()
375 		if (sca_data->chip->avail_modes_table[i] == reg_val)  in sca3300_get_op_mode()
378 	if (i == sca_data->chip->num_avail_modes)  in sca3300_get_op_mode()
520 static int sca3300_init(struct sca3300_data *sca_data,  in sca3300_init()  argument
527 	ret = sca3300_write_reg(sca_data, SCA3300_REG_MODE,  in sca3300_init()
539 	ret = sca3300_read_reg(sca_data, SCA3300_REG_WHOAMI, &value);  in sca3300_init()
548 		dev_err(&sca_data->spi->dev, "unknown chip id %x\n", value);  in sca3300_init()
552 	sca_data->chip = &sca3300_chip_tbl[i];  in sca3300_init()
554 	if (sca_data->chip->angle_supported) {  in sca3300_init()
555 		ret = sca3300_write_reg(sca_data, SCL3300_REG_ANG_CTRL,  in sca3300_init()
628 	struct sca3300_data *sca_data;  in sca3300_probe()  local
632 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*sca_data));  in sca3300_probe()
636 	sca_data = iio_priv(indio_dev);  in sca3300_probe()
637 	mutex_init(&sca_data->lock);  in sca3300_probe()
638 	sca_data->spi = spi;  in sca3300_probe()
644 	ret = sca3300_init(sca_data, indio_dev);  in sca3300_probe()
650 	indio_dev->name = sca_data->chip->name;  in sca3300_probe()
652 	indio_dev->channels = sca_data->chip->channels;  in sca3300_probe()
653 	indio_dev->num_channels = sca_data->chip->num_channels;  in sca3300_probe()
654 	indio_dev->available_scan_masks = sca_data->chip->scan_masks;  in sca3300_probe()