1 // SPDX-License-Identifier: GPL-2.0-only
63  * struct ad5791_chip_info - chip specific information
72  * struct ad5791_state - driver instance specific data
74  * @reg_vdd:		positive supply regulator
75  * @reg_vss:		negative supply regulator
78  * @vref_neg_mv:	voltage of the negative supply
110 	st->data[0].d32 = cpu_to_be32(AD5791_CMD_WRITE |  in ad5791_spi_write()
114 	return spi_write(st->spi, &st->data[0].d8[1], 3);  in ad5791_spi_write()
122 			.tx_buf = &st->data[0].d8[1],  in ad5791_spi_read()
127 			.tx_buf = &st->data[1].d8[1],  in ad5791_spi_read()
128 			.rx_buf = &st->data[2].d8[1],  in ad5791_spi_read()
134 	st->data[0].d32 = cpu_to_be32(AD5791_CMD_READ |  in ad5791_spi_read()
136 	st->data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));  in ad5791_spi_read()
138 	ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));  in ad5791_spi_read()
140 	*val = be32_to_cpu(st->data[2].d32);  in ad5791_spi_read()
155 	return st->pwr_down_mode;  in ad5791_get_powerdown_mode()
163 	st->pwr_down_mode = mode;  in ad5791_set_powerdown_mode()
180 	return sysfs_emit(buf, "%d\n", st->pwr_down);  in ad5791_read_dac_powerdown()
196 		st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);  in ad5791_write_dac_powerdown()
198 		if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)  in ad5791_write_dac_powerdown()
199 			st->ctrl |= AD5791_CTRL_OPGND;  in ad5791_write_dac_powerdown()
200 		else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)  in ad5791_write_dac_powerdown()
201 			st->ctrl |= AD5791_CTRL_DACTRI;  in ad5791_write_dac_powerdown()
203 	st->pwr_down = pwr_down;  in ad5791_write_dac_powerdown()
205 	ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl);  in ad5791_write_dac_powerdown()
258 		ret = ad5791_spi_read(st, chan->address, val);  in ad5791_read_raw()
262 		*val >>= chan->scan_type.shift;  in ad5791_read_raw()
265 		*val = st->vref_mv;  in ad5791_read_raw()
266 		*val2 = (1 << chan->scan_type.realbits) - 1;  in ad5791_read_raw()
269 		val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);  in ad5791_read_raw()
270 		do_div(val64, st->vref_mv);  in ad5791_read_raw()
271 		*val = -val64;  in ad5791_read_raw()
274 		return -EINVAL;  in ad5791_read_raw()
327 		val &= GENMASK(chan->scan_type.realbits - 1, 0);  in ad5791_write_raw()
328 		val <<= chan->scan_type.shift;  in ad5791_write_raw()
330 		return ad5791_spi_write(st, chan->address, val);  in ad5791_write_raw()
333 		return -EINVAL;  in ad5791_write_raw()
344 	struct ad5791_platform_data *pdata = spi->dev.platform_data;  in ad5791_probe()
349 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad5791_probe()
351 		return -ENOMEM;  in ad5791_probe()
353 	st->reg_vdd = devm_regulator_get(&spi->dev, "vdd");  in ad5791_probe()
354 	if (!IS_ERR(st->reg_vdd)) {  in ad5791_probe()
355 		ret = regulator_enable(st->reg_vdd);  in ad5791_probe()
359 		ret = regulator_get_voltage(st->reg_vdd);  in ad5791_probe()
366 	st->reg_vss = devm_regulator_get(&spi->dev, "vss");  in ad5791_probe()
367 	if (!IS_ERR(st->reg_vss)) {  in ad5791_probe()
368 		ret = regulator_enable(st->reg_vss);  in ad5791_probe()
372 		ret = regulator_get_voltage(st->reg_vss);  in ad5791_probe()
379 	st->pwr_down = true;  in ad5791_probe()
380 	st->spi = spi;  in ad5791_probe()
382 	if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {  in ad5791_probe()
383 		st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;  in ad5791_probe()
384 		st->vref_neg_mv = neg_voltage_uv / 1000;  in ad5791_probe()
386 		st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;  in ad5791_probe()
387 		st->vref_neg_mv = pdata->vref_neg_mv;  in ad5791_probe()
389 		dev_warn(&spi->dev, "reference voltage unspecified\n");  in ad5791_probe()
396 	st->chip_info =	&ad5791_chip_info_tbl[spi_get_device_id(spi)  in ad5791_probe()
397 					      ->driver_data];  in ad5791_probe()
400 	st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))  in ad5791_probe()
401 		  | ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |  in ad5791_probe()
404 	ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl |  in ad5791_probe()
410 	indio_dev->info = &ad5791_info;  in ad5791_probe()
411 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad5791_probe()
412 	indio_dev->channels  in ad5791_probe()
413 		= &ad5791_channels[spi_get_device_id(spi)->driver_data];  in ad5791_probe()
414 	indio_dev->num_channels = 1;  in ad5791_probe()
415 	indio_dev->name = spi_get_device_id(st->spi)->name;  in ad5791_probe()
423 	if (!IS_ERR(st->reg_vss))  in ad5791_probe()
424 		regulator_disable(st->reg_vss);  in ad5791_probe()
426 	if (!IS_ERR(st->reg_vdd))  in ad5791_probe()
427 		regulator_disable(st->reg_vdd);  in ad5791_probe()
437 	if (!IS_ERR(st->reg_vdd))  in ad5791_remove()
438 		regulator_disable(st->reg_vdd);  in ad5791_remove()
440 	if (!IS_ERR(st->reg_vss))  in ad5791_remove()
441 		regulator_disable(st->reg_vss);  in ad5791_remove()