iio/adc/ad7476.c

72 static void ad7091_convst(struct ad7476_state *st)  in ad7091_convst()  argument
74 	if (!st->convst_gpio)  in ad7091_convst()
77 	gpiod_set_value(st->convst_gpio, 0);  in ad7091_convst()
78 	udelay(1); /* CONVST pulse width: 10 ns min */  in ad7091_convst()
79 	gpiod_set_value(st->convst_gpio, 1);  in ad7091_convst()
80 	udelay(1); /* Conversion time: 650 ns max */  in ad7091_convst()
87 	struct ad7476_state *st = iio_priv(indio_dev);  in ad7476_trigger_handler()  local
90 	ad7091_convst(st);  in ad7476_trigger_handler()
92 	b_sent = spi_sync(st->spi, &st->msg);  in ad7476_trigger_handler()
96 	iio_push_to_buffers_with_timestamp(indio_dev, st->data,  in ad7476_trigger_handler()
104 static void ad7091_reset(struct ad7476_state *st)  in ad7091_reset()  argument
107 	spi_read(st->spi, st->data, 1);  in ad7091_reset()
110 static int ad7476_scan_direct(struct ad7476_state *st)  in ad7476_scan_direct()  argument
114 	ad7091_convst(st);  in ad7476_scan_direct()
116 	ret = spi_sync(st->spi, &st->msg);  in ad7476_scan_direct()
120 	return be16_to_cpup((__be16 *)st->data);  in ad7476_scan_direct()
130 	struct ad7476_state *st = iio_priv(indio_dev);  in ad7476_read_raw()  local
138 		ret = ad7476_scan_direct(st);  in ad7476_read_raw()
143 		*val = (ret >> st->chip_info->channel[0].scan_type.shift) &  in ad7476_read_raw()
144 			GENMASK(st->chip_info->channel[0].scan_type.realbits - 1, 0);  in ad7476_read_raw()
147 		if (!st->chip_info->int_vref_uv) {  in ad7476_read_raw()
148 			scale_uv = regulator_get_voltage(st->reg);  in ad7476_read_raw()
152 			scale_uv = st->chip_info->int_vref_uv;  in ad7476_read_raw()
164 	.indexed = 1,						\
191 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
193 		.convst_channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
198 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
202 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
206 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
210 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
214 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
218 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
222 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
227 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
231 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
235 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
239 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
243 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
247 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
251 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
261 	struct ad7476_state *st = data;  in ad7476_reg_disable()  local
263 	regulator_disable(st->reg);  in ad7476_reg_disable()
268 	struct ad7476_state *st;  in ad7476_probe()  local
272 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7476_probe()
276 	st = iio_priv(indio_dev);  in ad7476_probe()
277 	st->chip_info =  in ad7476_probe()
280 	st->reg = devm_regulator_get(&spi->dev, "vcc");  in ad7476_probe()
281 	if (IS_ERR(st->reg))  in ad7476_probe()
282 		return PTR_ERR(st->reg);  in ad7476_probe()
284 	ret = regulator_enable(st->reg);  in ad7476_probe()
289 				       st);  in ad7476_probe()
293 	st->convst_gpio = devm_gpiod_get_optional(&spi->dev,  in ad7476_probe()
296 	if (IS_ERR(st->convst_gpio))  in ad7476_probe()
297 		return PTR_ERR(st->convst_gpio);  in ad7476_probe()
301 	st->spi = spi;  in ad7476_probe()
305 	indio_dev->channels = st->chip_info->channel;  in ad7476_probe()
309 	if (st->convst_gpio)  in ad7476_probe()
310 		indio_dev->channels = st->chip_info->convst_channel;  in ad7476_probe()
313 	st->xfer.rx_buf = &st->data;  in ad7476_probe()
314 	st->xfer.len = st->chip_info->channel[0].scan_type.storagebits / 8;  in ad7476_probe()
316 	spi_message_init(&st->msg);  in ad7476_probe()
317 	spi_message_add_tail(&st->xfer, &st->msg);  in ad7476_probe()
324 	if (st->chip_info->reset)  in ad7476_probe()
325 		st->chip_info->reset(st);  in ad7476_probe()
335 	regulator_disable(st->reg);  in ad7476_probe()
382 MODULE_DESCRIPTION("Analog Devices AD7476 and similar 1-channel ADCs");