1 // SPDX-License-Identifier: GPL-2.0-only
3  * t5403.c - Support for EPCOS T5403 pressure/temperature sensor
7  * (7-bit I2C slave address 0x77)
9  * TODO: end-of-conversion irq
25 #define T5403_PT BIT(1) /* 0 .. pressure, 1 .. temperature measurement */
45 #define T5403_C_U16(i) le16_to_cpu(data->c[(i) - 1])
48 static int t5403_read(struct t5403_data *data, bool pressure)  in t5403_read()  argument
52 	int ret = i2c_smbus_write_byte_data(data->client, T5403_COMMAND,  in t5403_read()
53 		(pressure ? (data->mode << T5403_MODE_SHIFT) : T5403_PT) |  in t5403_read()
58 	wait_time += pressure ? t5403_pressure_conv_ms[data->mode] : 2;  in t5403_read()
62 	return i2c_smbus_read_word_data(data->client, T5403_DATA);  in t5403_read()
72 	mutex_lock(&data->lock);  in t5403_comp_pressure()
95 	X += ((X - 75000) * (X - 75000) / 0x10000 - 9537) *  in t5403_comp_pressure()
102 	mutex_unlock(&data->lock);  in t5403_comp_pressure()
111 	mutex_lock(&data->lock);  in t5403_comp_temp()
122 	mutex_unlock(&data->lock);  in t5403_comp_temp()
135 		switch (chan->type) {  in t5403_read_raw()
147 			return -EINVAL;  in t5403_read_raw()
151 		*val2 = t5403_pressure_conv_ms[data->mode] * 1000;  in t5403_read_raw()
154 		return -EINVAL;  in t5403_read_raw()
168 			return -EINVAL;  in t5403_write_raw()
171 				mutex_lock(&data->lock);  in t5403_write_raw()
172 				data->mode = i;  in t5403_write_raw()
173 				mutex_unlock(&data->lock);  in t5403_write_raw()
176 		return -EINVAL;  in t5403_write_raw()
178 		return -EINVAL;  in t5403_write_raw()
218 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |  in t5403_probe()
220 		return -EOPNOTSUPP;  in t5403_probe()
226 		return -ENODEV;  in t5403_probe()
228 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in t5403_probe()
230 		return -ENOMEM;  in t5403_probe()
233 	data->client = client;  in t5403_probe()
234 	mutex_init(&data->lock);  in t5403_probe()
237 	indio_dev->info = &t5403_info;  in t5403_probe()
238 	indio_dev->name = id->name;  in t5403_probe()
239 	indio_dev->modes = INDIO_DIRECT_MODE;  in t5403_probe()
240 	indio_dev->channels = t5403_channels;  in t5403_probe()
241 	indio_dev->num_channels = ARRAY_SIZE(t5403_channels);  in t5403_probe()
243 	data->mode = T5403_MODE_STANDARD;  in t5403_probe()
245 	ret = i2c_smbus_read_i2c_block_data(data->client, T5403_CALIB_DATA,  in t5403_probe()
246 	    sizeof(data->c), (u8 *) data->c);  in t5403_probe()
250 	return devm_iio_device_register(&client->dev, indio_dev);  in t5403_probe()
269 MODULE_DESCRIPTION("EPCOS T5403 pressure/temperature sensor driver");