1 // SPDX-License-Identifier: GPL-2.0
3  * Texas Instruments LMP92064 SPI ADC driver
7  * Based on linux/drivers/iio/adc/ti-tsc2046.c
46  * - IN Current (INC)
47  * - IN Voltage (INV)
126 static int lmp92064_read_meas(struct lmp92064_adc_priv *priv, u16 *res)  in lmp92064_read_meas()  argument
132 	 * The ADC only latches in new samples if all DATA registers are read  in lmp92064_read_meas()
134 	 * The ADC auto-decrements the register index with each clocked byte.  in lmp92064_read_meas()
140 	ret = regmap_bulk_read(priv->regmap, TI_LMP92064_REG_DATA_COUT_MSB,  in lmp92064_read_meas()
144 		dev_err(&priv->spi->dev, "regmap_bulk_read failed: %pe\n",  in lmp92064_read_meas()
149 	res[0] = be16_to_cpu(raw[0]);  in lmp92064_read_meas()
150 	res[1] = be16_to_cpu(raw[1]);  in lmp92064_read_meas()
169 		*val = (chan->address == TI_LMP92064_CHAN_INC) ? raw[0] : raw[1];  in lmp92064_read_raw()
173 		if (chan->address == TI_LMP92064_CHAN_INC) {  in lmp92064_read_raw()
180 			*val2 = priv->shunt_resistor_uohm;  in lmp92064_read_raw()
191 		return -EINVAL;  in lmp92064_read_raw()
198 	struct iio_dev *indio_dev = pf->indio_dev;  in lmp92064_trigger_handler()
216 	iio_trigger_notify_done(indio_dev->trig);  in lmp92064_trigger_handler()
232 		 * Use more conservative pulse lengths to allow analog RC filtering of the  in lmp92064_reset()
241 		 * Perform a soft-reset if not.  in lmp92064_reset()
245 		ret = regmap_write(priv->regmap, TI_LMP92064_REG_CONFIG_A,  in lmp92064_reset()
250 		ret = regmap_write(priv->regmap, TI_LMP92064_REG_CONFIG_B,  in lmp92064_reset()
260 	 * not more than 3-4 iterations of this loop.  in lmp92064_reset()
263 		ret = regmap_read(priv->regmap, TI_LMP92064_REG_STATUS, &status);  in lmp92064_reset()
277 	return -ENXIO;  in lmp92064_reset()
286 	struct device *dev = &spi->dev;  in lmp92064_adc_probe()
305 		return -ENOMEM;  in lmp92064_adc_probe()
309 	priv->spi = spi;  in lmp92064_adc_probe()
310 	priv->regmap = regmap;  in lmp92064_adc_probe()
312 	ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms",  in lmp92064_adc_probe()
316 				     "Failed to get shunt-resistor value\n");  in lmp92064_adc_probe()
324 		return -EINVAL;  in lmp92064_adc_probe()
327 	priv->shunt_resistor_uohm = shunt_resistor_uohm;  in lmp92064_adc_probe()
346 	indio_dev->name = "lmp92064";  in lmp92064_adc_probe()
347 	indio_dev->modes = INDIO_DIRECT_MODE;  in lmp92064_adc_probe()
348 	indio_dev->channels = lmp92064_adc_channels;  in lmp92064_adc_probe()
349 	indio_dev->num_channels = ARRAY_SIZE(lmp92064_adc_channels);  in lmp92064_adc_probe()
350 	indio_dev->info = &lmp92064_adc_info;  in lmp92064_adc_probe()
351 	indio_dev->available_scan_masks = lmp92064_scan_masks;  in lmp92064_adc_probe()
384 MODULE_DESCRIPTION("TI LMP92064 ADC");