1 // SPDX-License-Identifier: GPL-2.0-only
3  * LTC2632 Digital to analog convertors spi driver
5  * Copyright 2017 Maxime Roussin-Bélanger
28  * struct ltc2632_chip_info - chip specific information
40  * struct ltc2632_state - driver instance specific data
83 	 * followed by the 4-bit DAC address, A3 to A0, and then the  in ltc2632_spi_write()
84 	 * 12-, 10-, 8-bit data-word. The data-word comprises the 12-,  in ltc2632_spi_write()
85 	 * 10-, 8-bit input code followed by 4, 6, or 8 don't care bits.  in ltc2632_spi_write()
103 		*val = st->vref_mv;  in ltc2632_read_raw()
104 		*val2 = chan->scan_type.realbits;  in ltc2632_read_raw()
107 	return -EINVAL;  in ltc2632_read_raw()
120 		if (val >= (1 << chan->scan_type.realbits) || val < 0)  in ltc2632_write_raw()
121 			return -EINVAL;  in ltc2632_write_raw()
123 		return ltc2632_spi_write(st->spi_dev,  in ltc2632_write_raw()
125 					 chan->address, val,  in ltc2632_write_raw()
126 					 chan->scan_type.shift);  in ltc2632_write_raw()
128 		return -EINVAL;  in ltc2632_write_raw()
140 			  !!(st->powerdown_cache_mask & (1 << chan->channel)));  in ltc2632_read_dac_powerdown()
158 		st->powerdown_cache_mask |= (1 << chan->channel);  in ltc2632_write_dac_powerdown()
160 		st->powerdown_cache_mask &= ~(1 << chan->channel);  in ltc2632_write_dac_powerdown()
162 	ret = ltc2632_spi_write(st->spi_dev,  in ltc2632_write_dac_powerdown()
164 				chan->channel, 0, 0);  in ltc2632_write_dac_powerdown()
194 			.shift		= 16 - (_bits), \
315 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ltc2632_probe()
317 		return -ENOMEM;  in ltc2632_probe()
322 	st->spi_dev = spi;  in ltc2632_probe()
325 			spi_get_device_id(spi)->driver_data;  in ltc2632_probe()
327 	st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref");  in ltc2632_probe()
328 	if (PTR_ERR(st->vref_reg) == -ENODEV) {  in ltc2632_probe()
330 		st->vref_reg = NULL;  in ltc2632_probe()
331 		st->vref_mv = chip_info->vref_mv;  in ltc2632_probe()
336 			dev_err(&spi->dev,  in ltc2632_probe()
341 	} else if (IS_ERR(st->vref_reg)) {  in ltc2632_probe()
342 		dev_err(&spi->dev,  in ltc2632_probe()
344 		return PTR_ERR(st->vref_reg);  in ltc2632_probe()
347 		ret = regulator_enable(st->vref_reg);  in ltc2632_probe()
349 			dev_err(&spi->dev,  in ltc2632_probe()
354 		st->vref_mv = regulator_get_voltage(st->vref_reg) / 1000;  in ltc2632_probe()
359 			dev_err(&spi->dev,  in ltc2632_probe()
366 	indio_dev->name = fwnode_get_name(dev_fwnode(&spi->dev)) ?: spi_get_device_id(spi)->name;  in ltc2632_probe()
367 	indio_dev->info = &ltc2632_info;  in ltc2632_probe()
368 	indio_dev->modes = INDIO_DIRECT_MODE;  in ltc2632_probe()
369 	indio_dev->channels = chip_info->channels;  in ltc2632_probe()
370 	indio_dev->num_channels = chip_info->num_channels;  in ltc2632_probe()
382 	if (st->vref_reg)  in ltc2632_remove()
383 		regulator_disable(st->vref_reg);  in ltc2632_remove()
387 	{ "ltc2632-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L12] },
388 	{ "ltc2632-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L10] },
389 	{ "ltc2632-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L8] },
390 	{ "ltc2632-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H12] },
391 	{ "ltc2632-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H10] },
392 	{ "ltc2632-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H8] },
393 	{ "ltc2634-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L12] },
394 	{ "ltc2634-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L10] },
395 	{ "ltc2634-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L8] },
396 	{ "ltc2634-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H12] },
397 	{ "ltc2634-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H10] },
398 	{ "ltc2634-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H8] },
399 	{ "ltc2636-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L12] },
400 	{ "ltc2636-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L10] },
401 	{ "ltc2636-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L8] },
402 	{ "ltc2636-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H12] },
403 	{ "ltc2636-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H10] },
404 	{ "ltc2636-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H8] },
411 		.compatible = "lltc,ltc2632-l12",
414 		.compatible = "lltc,ltc2632-l10",
417 		.compatible = "lltc,ltc2632-l8",
420 		.compatible = "lltc,ltc2632-h12",
423 		.compatible = "lltc,ltc2632-h10",
426 		.compatible = "lltc,ltc2632-h8",
429 		.compatible = "lltc,ltc2634-l12",
432 		.compatible = "lltc,ltc2634-l10",
435 		.compatible = "lltc,ltc2634-l8",
438 		.compatible = "lltc,ltc2634-h12",
441 		.compatible = "lltc,ltc2634-h10",
444 		.compatible = "lltc,ltc2634-h8",
447 		.compatible = "lltc,ltc2636-l12",
450 		.compatible = "lltc,ltc2636-l10",
453 		.compatible = "lltc,ltc2636-l8",
456 		.compatible = "lltc,ltc2636-h12",
459 		.compatible = "lltc,ltc2636-h10",
462 		.compatible = "lltc,ltc2636-h8",
471 		.name	= "ltc2632",
480 MODULE_AUTHOR("Maxime Roussin-Belanger <maxime.roussinbelanger@gmail.com>");
481 MODULE_DESCRIPTION("LTC2632 DAC SPI driver");