1 // SPDX-License-Identifier: GPL-2.0-only
3  * ADS1100 - Texas Instruments Analog-to-Digital Converter
8  * IIO driver for ADS1100 and ADS1000 ADC 16-bit I2C
34 /* Gain */
49 	int scale_avail[2 * 4]; /* 4 gain settings */
73 	u8 config = (data->config & ~mask) | (value & mask);  in ads1100_set_config_bits()
75 	if (data->config == config)  in ads1100_set_config_bits()
78 	ret = i2c_master_send(data->client, &config, 1);  in ads1100_set_config_bits()
82 	data->config = config;  in ads1100_set_config_bits()
89 	return ads1100_data_rate_bits[FIELD_GET(ADS1100_DR_MASK, data->config)];  in ads1100_data_bits()
99 		return -EINVAL;  in ads1100_get_adc_result()
101 	ret = pm_runtime_resume_and_get(&data->client->dev);  in ads1100_get_adc_result()
105 	ret = i2c_master_recv(data->client, (char *)&buffer, sizeof(buffer));  in ads1100_get_adc_result()
107 	pm_runtime_mark_last_busy(&data->client->dev);  in ads1100_get_adc_result()
108 	pm_runtime_put_autosuspend(&data->client->dev);  in ads1100_get_adc_result()
111 		dev_err(&data->client->dev, "I2C read fail: %d\n", ret);  in ads1100_get_adc_result()
115 	/* Value is always 16-bit 2's complement */  in ads1100_get_adc_result()
119 	value <<= 16 - ads1100_data_bits(data);  in ads1100_get_adc_result()
129 	int gain;  in ads1100_set_scale()  local
133 		return -EINVAL;  in ads1100_set_scale()
136 		return -EINVAL;  in ads1100_set_scale()
138 	microvolts = regulator_get_voltage(data->reg_vdd);  in ads1100_set_scale()
142 	 * the full-scale value is d/n, corresponds to 2^15,  in ads1100_set_scale()
143 	 * hence the gain = (d / n) >> 15, factoring out the 1000 and moving the  in ads1100_set_scale()
144 	 * bitshift so everything fits in 32-bits yields this formula.  in ads1100_set_scale()
146 	gain = DIV_ROUND_CLOSEST(microvolts, BIT(15)) * MILLI / val2;  in ads1100_set_scale()
147 	if (gain < BIT(0) || gain > BIT(3))  in ads1100_set_scale()
148 		return -EINVAL;  in ads1100_set_scale()
150 	ads1100_set_config_bits(data, ADS1100_PGA_MASK, ffs(gain) - 1);  in ads1100_set_scale()
160 	size = data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1;  in ads1100_set_data_rate()
167 	return -EINVAL;  in ads1100_set_data_rate()
172 	return regulator_get_voltage(data->reg_vdd) / (MICRO / MILLI);  in ads1100_get_vdd_millivolts()
180 	for (i = 0; i < ARRAY_SIZE(data->scale_avail) / 2; i++) {  in ads1100_calc_scale_avail()
181 		data->scale_avail[i * 2 + 0] = millivolts;  in ads1100_calc_scale_avail()
182 		data->scale_avail[i * 2 + 1] = 15 + i;  in ads1100_calc_scale_avail()
193 	if (chan->type != IIO_VOLTAGE)  in ads1100_read_avail()
194 		return -EINVAL;  in ads1100_read_avail()
200 		if (data->supports_data_rate)  in ads1100_read_avail()
207 		*vals = data->scale_avail;  in ads1100_read_avail()
208 		*length = ARRAY_SIZE(data->scale_avail);  in ads1100_read_avail()
211 		return -EINVAL;  in ads1100_read_avail()
222 	mutex_lock(&data->lock);  in ads1100_read_raw()
229 		ret = ads1100_get_adc_result(data, chan->address, val);  in ads1100_read_raw()
235 		/* full-scale is the supply voltage in millivolts */  in ads1100_read_raw()
237 		*val2 = 15 + FIELD_GET(ADS1100_PGA_MASK, data->config);  in ads1100_read_raw()
242 						   data->config)];  in ads1100_read_raw()
246 		ret = -EINVAL;  in ads1100_read_raw()
249 	mutex_unlock(&data->lock);  in ads1100_read_raw()
261 	mutex_lock(&data->lock);  in ads1100_write_raw()
267 		ret = ads1100_set_data_rate(data, chan->address, val);  in ads1100_write_raw()
270 		ret = -EINVAL;  in ads1100_write_raw()
273 	mutex_unlock(&data->lock);  in ads1100_write_raw()
291 	ret = i2c_master_send(data->client, buffer, 1);  in ads1100_setup()
295 	ret = i2c_master_recv(data->client, buffer, sizeof(buffer));  in ads1100_setup()
300 	data->config = buffer[2] & ~ADS1100_CFG_ST_BSY;  in ads1100_setup()
303 	data->supports_data_rate = FIELD_GET(ADS1100_DR_MASK, buffer[2]) != 0;  in ads1100_setup()
322 	struct device *dev = &client->dev;  in ads1100_probe()
327 		return -ENOMEM;  in ads1100_probe()
331 	data->client = client;  in ads1100_probe()
332 	mutex_init(&data->lock);  in ads1100_probe()
334 	indio_dev->name = "ads1100";  in ads1100_probe()
335 	indio_dev->modes = INDIO_DIRECT_MODE;  in ads1100_probe()
336 	indio_dev->channels = &ads1100_channel;  in ads1100_probe()
337 	indio_dev->num_channels = 1;  in ads1100_probe()
338 	indio_dev->info = &ads1100_info;  in ads1100_probe()
340 	data->reg_vdd = devm_regulator_get(dev, "vdd");  in ads1100_probe()
341 	if (IS_ERR(data->reg_vdd))  in ads1100_probe()
342 		return dev_err_probe(dev, PTR_ERR(data->reg_vdd),  in ads1100_probe()
345 	ret = regulator_enable(data->reg_vdd);  in ads1100_probe()
350 	ret = devm_add_action_or_reset(dev, ads1100_reg_disable, data->reg_vdd);  in ads1100_probe()
385 	regulator_disable(data->reg_vdd);  in ads1100_runtime_suspend()
395 	ret = regulator_enable(data->reg_vdd);  in ads1100_runtime_resume()
397 		dev_err(&data->client->dev, "Failed to enable Vdd\n");  in ads1100_runtime_resume()
404 	 * has been power-cycled, we'll re-write its config register now.  in ads1100_runtime_resume()