1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * mcp3422.c - driver for the Microchip mcp3421/2/3/4/5/6/7/8 chip family
41 #define MCP3422_CHANNEL(config)	(((config) & MCP3422_CHANNEL_MASK) >> 5)  argument
42 #define MCP3422_PGA(config)	((config) & MCP3422_PGA_MASK)  argument
43 #define MCP3422_SAMPLE_RATE(config)	(((config) & MCP3422_SRATE_MASK) >> 2)  argument
59 static const int mcp3422_scales[4][4] = {
66 static const int mcp3422_read_times[4] = {
73 static const int mcp3422_sample_rates[4] = {
80 static const int mcp3422_sign_extend[4] = {
90 	u8 config;  member
95 static int mcp3422_update_config(struct mcp3422 *adc, u8 newconfig)  in mcp3422_update_config()
99 	ret = i2c_master_send(adc->i2c, &newconfig, 1);  in mcp3422_update_config()
101 		adc->config = newconfig;  in mcp3422_update_config()
108 static int mcp3422_read(struct mcp3422 *adc, int *value, u8 *config)  in mcp3422_read()  argument
111 	u8 sample_rate = MCP3422_SAMPLE_RATE(adc->config);  in mcp3422_read()
116 		ret = i2c_master_recv(adc->i2c, buf, 4);  in mcp3422_read()
118 		*config = buf[3];  in mcp3422_read()
120 		ret = i2c_master_recv(adc->i2c, buf, 3);  in mcp3422_read()
122 		*config = buf[2];  in mcp3422_read()
130 static int mcp3422_read_channel(struct mcp3422 *adc,  in mcp3422_read_channel()
134 	u8 config;  in mcp3422_read_channel()  local
135 	u8 req_channel = channel->channel;  in mcp3422_read_channel()
137 	mutex_lock(&adc->lock);  in mcp3422_read_channel()
139 	if (req_channel != MCP3422_CHANNEL(adc->config)) {  in mcp3422_read_channel()
140 		config = adc->config;  in mcp3422_read_channel()
141 		config &= ~MCP3422_CHANNEL_MASK;  in mcp3422_read_channel()
142 		config |= MCP3422_CHANNEL_VALUE(req_channel);  in mcp3422_read_channel()
143 		config &= ~MCP3422_PGA_MASK;  in mcp3422_read_channel()
144 		config |= MCP3422_PGA_VALUE(adc->pga[req_channel]);  in mcp3422_read_channel()
145 		ret = mcp3422_update_config(adc, config);  in mcp3422_read_channel()
147 			mutex_unlock(&adc->lock);  in mcp3422_read_channel()
150 		msleep(mcp3422_read_times[MCP3422_SAMPLE_RATE(adc->config)]);  in mcp3422_read_channel()
153 	ret = mcp3422_read(adc, value, &config);  in mcp3422_read_channel()
155 	mutex_unlock(&adc->lock);  in mcp3422_read_channel()
160 static int mcp3422_read_raw(struct iio_dev *iio,  in mcp3422_read_raw()
167 	u8 sample_rate = MCP3422_SAMPLE_RATE(adc->config);  in mcp3422_read_raw()
168 	u8 pga		 = MCP3422_PGA(adc->config);  in mcp3422_read_raw()
174 			return -EINVAL;  in mcp3422_read_raw()
184 		*val1 = mcp3422_sample_rates[MCP3422_SAMPLE_RATE(adc->config)];  in mcp3422_read_raw()
191 	return -EINVAL;  in mcp3422_read_raw()
194 static int mcp3422_write_raw(struct iio_dev *iio,  in mcp3422_write_raw()
200 	u8 config = adc->config;  in mcp3422_write_raw()  local
201 	u8 req_channel = channel->channel;  in mcp3422_write_raw()
202 	u8 sample_rate = MCP3422_SAMPLE_RATE(config);  in mcp3422_write_raw()
208 			return -EINVAL;  in mcp3422_write_raw()
212 				adc->pga[req_channel] = i;  in mcp3422_write_raw()
214 				config &= ~MCP3422_CHANNEL_MASK;  in mcp3422_write_raw()
215 				config |= MCP3422_CHANNEL_VALUE(req_channel);  in mcp3422_write_raw()
216 				config &= ~MCP3422_PGA_MASK;  in mcp3422_write_raw()
217 				config |= MCP3422_PGA_VALUE(adc->pga[req_channel]);  in mcp3422_write_raw()
219 				return mcp3422_update_config(adc, config);  in mcp3422_write_raw()
222 		return -EINVAL;  in mcp3422_write_raw()
236 			if (adc->id > 4)  in mcp3422_write_raw()
237 				return -EINVAL;  in mcp3422_write_raw()
241 			return -EINVAL;  in mcp3422_write_raw()
244 		config &= ~MCP3422_CHANNEL_MASK;  in mcp3422_write_raw()
245 		config |= MCP3422_CHANNEL_VALUE(req_channel);  in mcp3422_write_raw()
246 		config &= ~MCP3422_SRATE_MASK;  in mcp3422_write_raw()
247 		config |= MCP3422_SAMPLE_RATE_VALUE(temp);  in mcp3422_write_raw()
249 		return mcp3422_update_config(adc, config);  in mcp3422_write_raw()
255 	return -EINVAL;  in mcp3422_write_raw()
258 static int mcp3422_write_raw_get_fmt(struct iio_dev *indio_dev,  in mcp3422_write_raw_get_fmt()
267 		return -EINVAL;  in mcp3422_write_raw_get_fmt()
271 static ssize_t mcp3422_show_samp_freqs(struct device *dev,  in mcp3422_show_samp_freqs()
276 	if (adc->id > 4)  in mcp3422_show_samp_freqs()
282 static ssize_t mcp3422_show_scales(struct device *dev,  in mcp3422_show_scales()
286 	u8 sample_rate = MCP3422_SAMPLE_RATE(adc->config);  in mcp3422_show_scales()
295 static IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO,
297 static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,
300 static struct attribute *mcp3422_attributes[] = {
306 static const struct attribute_group mcp3422_attribute_group = {
310 static const struct iio_chan_spec mcp3421_channels[] = {
314 static const struct iio_chan_spec mcp3422_channels[] = {
319 static const struct iio_chan_spec mcp3424_channels[] = {
326 static const struct iio_info mcp3422_info = {
333 static int mcp3422_probe(struct i2c_client *client)  in mcp3422_probe()
339 	u8 config;  in mcp3422_probe()  local
341 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))  in mcp3422_probe()
342 		return -EOPNOTSUPP;  in mcp3422_probe()
344 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*adc));  in mcp3422_probe()
346 		return -ENOMEM;  in mcp3422_probe()
349 	adc->i2c = client;  in mcp3422_probe()
350 	adc->id = (u8)(id->driver_data);  in mcp3422_probe()
352 	mutex_init(&adc->lock);  in mcp3422_probe()
354 	indio_dev->name = dev_name(&client->dev);  in mcp3422_probe()
355 	indio_dev->modes = INDIO_DIRECT_MODE;  in mcp3422_probe()
356 	indio_dev->info = &mcp3422_info;  in mcp3422_probe()
358 	switch (adc->id) {  in mcp3422_probe()
361 		indio_dev->channels = mcp3421_channels;  in mcp3422_probe()
362 		indio_dev->num_channels = ARRAY_SIZE(mcp3421_channels);  in mcp3422_probe()
368 		indio_dev->channels = mcp3422_channels;  in mcp3422_probe()
369 		indio_dev->num_channels = ARRAY_SIZE(mcp3422_channels);  in mcp3422_probe()
373 		indio_dev->channels = mcp3424_channels;  in mcp3422_probe()
374 		indio_dev->num_channels = ARRAY_SIZE(mcp3424_channels);  in mcp3422_probe()
379 	config = (MCP3422_CONT_SAMPLING  in mcp3422_probe()
383 	err = mcp3422_update_config(adc, config);  in mcp3422_probe()
387 	err = devm_iio_device_register(&client->dev, indio_dev);  in mcp3422_probe()
396 static const struct i2c_device_id mcp3422_id[] = {
409 static const struct of_device_id mcp3422_of_match[] = {
415 static struct i2c_driver mcp3422_driver = {