1 // SPDX-License-Identifier: GPL-2.0+
3  * lmp91000.c - Support for Texas Instruments digital potentiostats
23 #define LMP91000_REG_LOCK		0x01
24 #define LMP91000_REG_TIACN		0x10
27 #define LMP91000_REG_REFCN		0x11
28 #define LMP91000_REG_REFCN_EXT_REF	0x20
29 #define LMP91000_REG_REFCN_50_ZERO	0x80
31 #define LMP91000_REG_MODECN		0x12
32 #define LMP91000_REG_MODECN_3LEAD	0x03
33 #define LMP91000_REG_MODECN_TEMP	0x07
37 static const int lmp91000_tia_gain[] = { 0, 2750, 3500, 7000, 14000, 35000,
42 #define LMP91000_TEMP_BASE	-40
56 	 987,  979,  971,  962,  954,  945,  937,  929,  920,  912,
75 	u32 buffer[4]; /* 64-bit data + 64-bit timestamp */
81 		.channel = 0,
86 		.scan_index = 0,
99 		.scan_index = -1,
107 	ret = regmap_read(data->regmap, LMP91000_REG_MODECN, &state);  in lmp91000_read()
109 		return -EINVAL;  in lmp91000_read()
111 	ret = regmap_write(data->regmap, LMP91000_REG_MODECN, channel);  in lmp91000_read()
113 		return -EINVAL;  in lmp91000_read()
119 	data->chan_select = channel != LMP91000_REG_MODECN_3LEAD;  in lmp91000_read()
121 	iio_trigger_poll_chained(data->trig);  in lmp91000_read()
123 	ret = wait_for_completion_timeout(&data->completion, HZ);  in lmp91000_read()
124 	reinit_completion(&data->completion);  in lmp91000_read()
127 		return -ETIMEDOUT;  in lmp91000_read()
129 	*val = data->buffer[data->chan_select];  in lmp91000_read()
131 	return 0;  in lmp91000_read()
137 	struct iio_dev *indio_dev = pf->indio_dev;  in lmp91000_buffer_handler()
141 	memset(data->buffer, 0, sizeof(data->buffer));  in lmp91000_buffer_handler()
145 		data->buffer[0] = val;  in lmp91000_buffer_handler()
146 		iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,  in lmp91000_buffer_handler()
150 	iio_trigger_notify_done(indio_dev->trig);  in lmp91000_buffer_handler()
164 		int ret = iio_channel_start_all_cb(data->cb_buffer);  in lmp91000_read_raw()
169 		ret = lmp91000_read(data, chan->address, val);  in lmp91000_read_raw()
171 		iio_channel_stop_all_cb(data->cb_buffer);  in lmp91000_read_raw()
179 			ret = iio_convert_raw_to_processed(data->adc_chan,  in lmp91000_read_raw()
184 			for (i = 0; i < ARRAY_SIZE(lmp91000_temp_lut); i++)  in lmp91000_read_raw()
193 		return iio_read_channel_offset(data->adc_chan, val, val2);  in lmp91000_read_raw()
195 		return iio_read_channel_scale(data->adc_chan, val, val2);  in lmp91000_read_raw()
198 	return -EINVAL;  in lmp91000_read_raw()
207 	struct device *dev = data->dev;  in lmp91000_read_config()
211 	ret = device_property_read_u32(dev, "ti,tia-gain-ohm", &val);  in lmp91000_read_config()
213 		if (!device_property_read_bool(dev, "ti,external-tia-resistor")) {  in lmp91000_read_config()
214 			dev_err(dev, "no ti,tia-gain-ohm defined and external resistor not specified\n");  in lmp91000_read_config()
217 		val = 0;  in lmp91000_read_config()
220 	ret = -EINVAL;  in lmp91000_read_config()
221 	for (i = 0; i < ARRAY_SIZE(lmp91000_tia_gain); i++) {  in lmp91000_read_config()
224 			ret = 0;  in lmp91000_read_config()
230 		dev_err(dev, "invalid ti,tia-gain-ohm %d\n", val);  in lmp91000_read_config()
234 	ret = device_property_read_u32(dev, "ti,rload-ohm", &val);  in lmp91000_read_config()
237 		dev_info(dev, "no ti,rload-ohm defined, default to %d\n", val);  in lmp91000_read_config()
240 	ret = -EINVAL;  in lmp91000_read_config()
241 	for (i = 0; i < ARRAY_SIZE(lmp91000_rload); i++) {  in lmp91000_read_config()
244 			ret = 0;  in lmp91000_read_config()
250 		dev_err(dev, "invalid ti,rload-ohm %d\n", val);  in lmp91000_read_config()
254 	regmap_write(data->regmap, LMP91000_REG_LOCK, 0);  in lmp91000_read_config()
255 	regmap_write(data->regmap, LMP91000_REG_TIACN, reg);  in lmp91000_read_config()
256 	regmap_write(data->regmap, LMP91000_REG_REFCN,  in lmp91000_read_config()
258 	regmap_write(data->regmap, LMP91000_REG_LOCK, 1);  in lmp91000_read_config()
260 	return 0;  in lmp91000_read_config()
268 	data->buffer[data->chan_select] = *((int *)val);  in lmp91000_buffer_cb()
269 	complete_all(&data->completion);  in lmp91000_buffer_cb()
271 	return 0;  in lmp91000_buffer_cb()
281 	return iio_channel_start_all_cb(data->cb_buffer);  in lmp91000_buffer_postenable()
288 	iio_channel_stop_all_cb(data->cb_buffer);  in lmp91000_buffer_predisable()
290 	return 0;  in lmp91000_buffer_predisable()
301 	struct device *dev = &client->dev;  in lmp91000_probe()
308 		return -ENOMEM;  in lmp91000_probe()
310 	indio_dev->info = &lmp91000_info;  in lmp91000_probe()
311 	indio_dev->channels = lmp91000_channels;  in lmp91000_probe()
312 	indio_dev->num_channels = ARRAY_SIZE(lmp91000_channels);  in lmp91000_probe()
313 	indio_dev->name = LMP91000_DRV_NAME;  in lmp91000_probe()
314 	indio_dev->modes = INDIO_DIRECT_MODE;  in lmp91000_probe()
318 	data->dev = dev;  in lmp91000_probe()
319 	data->regmap = devm_regmap_init_i2c(client, &lmp91000_regmap_config);  in lmp91000_probe()
320 	if (IS_ERR(data->regmap)) {  in lmp91000_probe()
322 		return PTR_ERR(data->regmap);  in lmp91000_probe()
325 	data->trig = devm_iio_trigger_alloc(data->dev, "%s-mux%d",  in lmp91000_probe()
326 					    indio_dev->name, indio_dev->id);  in lmp91000_probe()
327 	if (!data->trig) {  in lmp91000_probe()
329 		return -ENOMEM;  in lmp91000_probe()
332 	data->trig->ops = &lmp91000_trigger_ops;  in lmp91000_probe()
333 	data->trig->dev.parent = dev;  in lmp91000_probe()
334 	init_completion(&data->completion);  in lmp91000_probe()
340 	ret = iio_trigger_set_immutable(iio_channel_cb_get_iio_dev(data->cb_buffer),  in lmp91000_probe()
341 					data->trig);  in lmp91000_probe()
347 	ret = iio_trigger_register(data->trig);  in lmp91000_probe()
359 	data->cb_buffer = iio_channel_get_all_cb(dev, &lmp91000_buffer_cb,  in lmp91000_probe()
362 	if (IS_ERR(data->cb_buffer)) {  in lmp91000_probe()
363 		if (PTR_ERR(data->cb_buffer) == -ENODEV)  in lmp91000_probe()
364 			ret = -EPROBE_DEFER;  in lmp91000_probe()
366 			ret = PTR_ERR(data->cb_buffer);  in lmp91000_probe()
371 	data->adc_chan = iio_channel_cb_get_channels(data->cb_buffer);  in lmp91000_probe()
377 	return 0;  in lmp91000_probe()
380 	iio_channel_release_all_cb(data->cb_buffer);  in lmp91000_probe()
386 	iio_trigger_unregister(data->trig);  in lmp91000_probe()
398 	iio_channel_stop_all_cb(data->cb_buffer);  in lmp91000_remove()
399 	iio_channel_release_all_cb(data->cb_buffer);  in lmp91000_remove()
402 	iio_trigger_unregister(data->trig);  in lmp91000_remove()
404 	return 0;  in lmp91000_remove()
415 	{ "lmp91000", 0 },
416 	{ "lmp91002", 0 },