1 // SPDX-License-Identifier: GPL-2.0+
3  * mcp9600.c - Support for Microchip MCP9600 thermocouple EMF converter
31 #define MCP9600_ALERT_CFG(x)		(MCP9600_ALERT_CFG1 + (x - 1))
37 #define MCP9600_ALERT_HYSTERESIS(x)	(MCP9600_ALERT_HYSTERESIS1 + (x - 1))
39 #define MCP9600_ALERT_LIMIT(x)		(MCP9600_ALERT_LIMIT1 + (x - 1))
48 #define MCP9600_MIN_TEMP_HOT_JUNCTION_MICRO	-200000000
51 #define MCP9600_MIN_TEMP_COLD_JUNCTION_MICRO	-40000000
108 	MCP9600_CHANNELS(0, 0, 0, 0), /* Alerts: - - - - */
109 	MCP9600_CHANNELS(1, 0, 0, 0), /* Alerts: 1 - - - */
110 	MCP9600_CHANNELS(1, 1, 0, 0), /* Alerts: - 2 - - */
111 	MCP9600_CHANNELS(2, 0, 0, 0), /* Alerts: 1 2 - - */
112 	MCP9600_CHANNELS(0, 0, 1, 0), /* Alerts: - - 3 - */
113 	MCP9600_CHANNELS(1, 0, 1, 0), /* Alerts: 1 - 3 - */
114 	MCP9600_CHANNELS(1, 1, 1, 0), /* Alerts: - 2 3 - */
115 	MCP9600_CHANNELS(2, 0, 1, 0), /* Alerts: 1 2 3 - */
116 	MCP9600_CHANNELS(0, 0, 1, 1), /* Alerts: - - - 4 */
117 	MCP9600_CHANNELS(1, 0, 1, 1), /* Alerts: 1 - - 4 */
118 	MCP9600_CHANNELS(1, 1, 1, 1), /* Alerts: - 2 - 4 */
119 	MCP9600_CHANNELS(2, 0, 1, 1), /* Alerts: 1 2 - 4 */
120 	MCP9600_CHANNELS(0, 0, 2, 0), /* Alerts: - - 3 4 */
121 	MCP9600_CHANNELS(1, 0, 2, 0), /* Alerts: 1 - 3 4 */
122 	MCP9600_CHANNELS(1, 1, 2, 0), /* Alerts: - 2 3 4 */
135 	ret = i2c_smbus_read_word_swapped(data->client, chan->address);  in mcp9600_read()
163 		return -EINVAL;  in mcp9600_read_raw()
188 	struct i2c_client *client = data->client;  in mcp9600_read_event_config()
191 	i = mcp9600_get_alert_index(chan->channel2, dir);  in mcp9600_read_event_config()
206 	struct i2c_client *client = data->client;  in mcp9600_write_event_config()
209 	i = mcp9600_get_alert_index(chan->channel2, dir);  in mcp9600_write_event_config()
229 	struct i2c_client *client = data->client;  in mcp9600_read_thresh()
233 	i = mcp9600_get_alert_index(chan->channel2, dir);  in mcp9600_read_thresh()
241 		 * bits(15:2), LSB is 0.25 degree celsius.  in mcp9600_read_thresh()
254 		return -EINVAL;  in mcp9600_read_thresh()
265 	struct i2c_client *client = data->client;  in mcp9600_write_thresh()
270 	i = mcp9600_get_alert_index(chan->channel2, dir);  in mcp9600_write_thresh()
274 		s_val = (val < 0) ? ((val * 1000000) - val2) :  in mcp9600_write_thresh()
276 		if (chan->channel2 == IIO_MOD_TEMP_AMBIENT) {  in mcp9600_write_thresh()
298 		return -EINVAL;  in mcp9600_write_thresh()
311 					 enum mcp9600_alert alert,  in mcp9600_alert_handler()  argument
319 	ret = i2c_smbus_read_byte_data(data->client, MCP9600_STATUS);  in mcp9600_alert_handler()
323 	if (!(ret & MCP9600_STATUS_ALERT(alert)))  in mcp9600_alert_handler()
368 	struct i2c_client *client = data->client;  in mcp9600_probe_alerts()
369 	struct device *dev = &client->dev;  in mcp9600_probe_alerts()
425 		return dev_err_probe(&client->dev, ret, "Failed to read device ID\n");  in mcp9600_probe()
427 		dev_warn(&client->dev, "Expected ID %x, got %x\n",  in mcp9600_probe()
430 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in mcp9600_probe()
432 		return -ENOMEM;  in mcp9600_probe()
435 	data->client = client;  in mcp9600_probe()
441 	indio_dev->info = &mcp9600_info;  in mcp9600_probe()
442 	indio_dev->name = "mcp9600";  in mcp9600_probe()
443 	indio_dev->modes = INDIO_DIRECT_MODE;  in mcp9600_probe()
444 	indio_dev->channels = mcp9600_channels[ch_sel];  in mcp9600_probe()
445 	indio_dev->num_channels = ARRAY_SIZE(mcp9600_channels[ch_sel]);  in mcp9600_probe()
447 	return devm_iio_device_register(&client->dev, indio_dev);  in mcp9600_probe()