1 // SPDX-License-Identifier: GPL-2.0-only
3  * LTC2632 Digital to analog convertors spi driver
5  * Copyright 2017 Maxime Roussin-Bélanger
27  * struct ltc2632_chip_info - chip specific information
39  * struct ltc2632_state - driver instance specific data
82 	 * followed by the 4-bit DAC address, A3 to A0, and then the  in ltc2632_spi_write()
83 	 * 12-, 10-, 8-bit data-word. The data-word comprises the 12-,  in ltc2632_spi_write()
84 	 * 10-, 8-bit input code followed by 4, 6, or 8 don't care bits.  in ltc2632_spi_write()
102 		*val = st->vref_mv;  in ltc2632_read_raw()
103 		*val2 = chan->scan_type.realbits;  in ltc2632_read_raw()
106 	return -EINVAL;  in ltc2632_read_raw()
119 		if (val >= (1 << chan->scan_type.realbits) || val < 0)  in ltc2632_write_raw()
120 			return -EINVAL;  in ltc2632_write_raw()
122 		return ltc2632_spi_write(st->spi_dev,  in ltc2632_write_raw()
124 					 chan->address, val,  in ltc2632_write_raw()
125 					 chan->scan_type.shift);  in ltc2632_write_raw()
127 		return -EINVAL;  in ltc2632_write_raw()
139 		       !!(st->powerdown_cache_mask & (1 << chan->channel)));  in ltc2632_read_dac_powerdown()
157 		st->powerdown_cache_mask |= (1 << chan->channel);  in ltc2632_write_dac_powerdown()
159 		st->powerdown_cache_mask &= ~(1 << chan->channel);  in ltc2632_write_dac_powerdown()
161 	ret = ltc2632_spi_write(st->spi_dev,  in ltc2632_write_dac_powerdown()
163 				chan->channel, 0, 0);  in ltc2632_write_dac_powerdown()
193 			.shift		= 16 - (_bits), \
314 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ltc2632_probe()
316 		return -ENOMEM;  in ltc2632_probe()
321 	st->spi_dev = spi;  in ltc2632_probe()
324 			spi_get_device_id(spi)->driver_data;  in ltc2632_probe()
326 	st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref");  in ltc2632_probe()
327 	if (PTR_ERR(st->vref_reg) == -ENODEV) {  in ltc2632_probe()
329 		st->vref_reg = NULL;  in ltc2632_probe()
330 		st->vref_mv = chip_info->vref_mv;  in ltc2632_probe()
335 			dev_err(&spi->dev,  in ltc2632_probe()
340 	} else if (IS_ERR(st->vref_reg)) {  in ltc2632_probe()
341 		dev_err(&spi->dev,  in ltc2632_probe()
343 		return PTR_ERR(st->vref_reg);  in ltc2632_probe()
346 		ret = regulator_enable(st->vref_reg);  in ltc2632_probe()
348 			dev_err(&spi->dev,  in ltc2632_probe()
353 		st->vref_mv = regulator_get_voltage(st->vref_reg) / 1000;  in ltc2632_probe()
358 			dev_err(&spi->dev,  in ltc2632_probe()
365 	indio_dev->name = dev_of_node(&spi->dev) ? dev_of_node(&spi->dev)->name  in ltc2632_probe()
366 						 : 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()
389 	{ "ltc2632-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L12] },
390 	{ "ltc2632-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L10] },
391 	{ "ltc2632-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632L8] },
392 	{ "ltc2632-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H12] },
393 	{ "ltc2632-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H10] },
394 	{ "ltc2632-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H8] },
395 	{ "ltc2634-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L12] },
396 	{ "ltc2634-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L10] },
397 	{ "ltc2634-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L8] },
398 	{ "ltc2634-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H12] },
399 	{ "ltc2634-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H10] },
400 	{ "ltc2634-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H8] },
401 	{ "ltc2636-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L12] },
402 	{ "ltc2636-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L10] },
403 	{ "ltc2636-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L8] },
404 	{ "ltc2636-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H12] },
405 	{ "ltc2636-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H10] },
406 	{ "ltc2636-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636H8] },
413 		.compatible = "lltc,ltc2632-l12",
416 		.compatible = "lltc,ltc2632-l10",
419 		.compatible = "lltc,ltc2632-l8",
422 		.compatible = "lltc,ltc2632-h12",
425 		.compatible = "lltc,ltc2632-h10",
428 		.compatible = "lltc,ltc2632-h8",
431 		.compatible = "lltc,ltc2634-l12",
434 		.compatible = "lltc,ltc2634-l10",
437 		.compatible = "lltc,ltc2634-l8",
440 		.compatible = "lltc,ltc2634-h12",
443 		.compatible = "lltc,ltc2634-h10",
446 		.compatible = "lltc,ltc2634-h8",
449 		.compatible = "lltc,ltc2636-l12",
452 		.compatible = "lltc,ltc2636-l10",
455 		.compatible = "lltc,ltc2636-l8",
458 		.compatible = "lltc,ltc2636-h12",
461 		.compatible = "lltc,ltc2636-h10",
464 		.compatible = "lltc,ltc2636-h8",
473 		.name	= "ltc2632",
482 MODULE_AUTHOR("Maxime Roussin-Belanger <maxime.roussinbelanger@gmail.com>");
483 MODULE_DESCRIPTION("LTC2632 DAC SPI driver");