iio/adc/ltc2497.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * ltc2497.c - Driver for Analog Devices/Linear Technology LTC2497 ADC
49 		if (st->recv_size == 3)  in ltc2497_result_and_measure()
50 			ret = i2c_master_recv(st->client, (char *)&st->data.d8,  in ltc2497_result_and_measure()
51 					      st->recv_size);  in ltc2497_result_and_measure()
53 			ret = i2c_master_recv(st->client, (char *)&st->data.d32,  in ltc2497_result_and_measure()
54 					      st->recv_size);  in ltc2497_result_and_measure()
56 			dev_err(&st->client->dev, "i2c_master_recv failed\n");  in ltc2497_result_and_measure()
66 		if (st->recv_size == 3) {  in ltc2497_result_and_measure()
67 			*val = (get_unaligned_be24(st->data.d8) >> 6)  in ltc2497_result_and_measure()
68 				- BIT(ddata->chip_info->resolution + 1);  in ltc2497_result_and_measure()
70 			*val = (be32_to_cpu(st->data.d32) >> 6)  in ltc2497_result_and_measure()
71 				- BIT(ddata->chip_info->resolution + 1);  in ltc2497_result_and_measure()
75 		 * The part started a new conversion at the end of the above i2c  in ltc2497_result_and_measure()
78 		 * If not (which should only happen when some sort of bulk  in ltc2497_result_and_measure()
79 		 * conversion is implemented) we have to program the new  in ltc2497_result_and_measure()
80 		 * address. Note that this probably fails as the conversion that  in ltc2497_result_and_measure()
84 		if (ddata->addr_prev == address)  in ltc2497_result_and_measure()
88 	ret = i2c_smbus_write_byte(st->client,  in ltc2497_result_and_measure()
91 		dev_err(&st->client->dev, "i2c transfer failed: %pe\n",  in ltc2497_result_and_measure()
101 	struct device *dev = &client->dev;  in ltc2497_probe()
104 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |  in ltc2497_probe()
106 		return -EOPNOTSUPP;  in ltc2497_probe()
110 		return -ENOMEM;  in ltc2497_probe()
114 	st->client = client;  in ltc2497_probe()
115 	st->common_ddata.result_and_measure = ltc2497_result_and_measure;  in ltc2497_probe()
118 	st->common_ddata.chip_info = chip_info;  in ltc2497_probe()
120 	resolution = chip_info->resolution;  in ltc2497_probe()
121 	st->recv_size = BITS_TO_BYTES(resolution) + 1;  in ltc2497_probe()
156 MODULE_DEVICE_TABLE(of, ltc2497_of_match);