1 // SPDX-License-Identifier: GPL-2.0
2 /* ti-dac7311.c - Texas Instruments 8/10/12-bit 1-channel DAC driver
37  * struct ti_dac_chip - TI DAC chip
61 		return ti_dac->powerdown_mode + 1;  in ti_dac_get_power()
68 	u8 shift = 14 - ti_dac->resolution;  in ti_dac_cmd()
70 	ti_dac->buf[0] = (val << shift) & 0xFF;  in ti_dac_cmd()
71 	ti_dac->buf[1] = (power << 6) | (val >> (8 - shift));  in ti_dac_cmd()
72 	return spi_write(ti_dac->spi, ti_dac->buf, 2);  in ti_dac_cmd()
86 	return ti_dac->powerdown_mode;  in ti_dac_get_powerdown_mode()
91 				     unsigned int mode)  in ti_dac_set_powerdown_mode()  argument
95 	ti_dac->powerdown_mode = mode;  in ti_dac_set_powerdown_mode()
113 	return sysfs_emit(buf, "%d\n", ti_dac->powerdown);  in ti_dac_read_powerdown()
132 	mutex_lock(&ti_dac->lock);  in ti_dac_write_powerdown()
135 		ti_dac->powerdown = powerdown;  in ti_dac_write_powerdown()
136 	mutex_unlock(&ti_dac->lock);  in ti_dac_write_powerdown()
168 			   int *val, int *val2, long mask)  in ti_dac_read_raw()  argument
173 	switch (mask) {  in ti_dac_read_raw()
175 		*val = ti_dac->val;  in ti_dac_read_raw()
179 		ret = regulator_get_voltage(ti_dac->vref);  in ti_dac_read_raw()
184 		*val2 = ti_dac->resolution;  in ti_dac_read_raw()
188 	return -EINVAL;  in ti_dac_read_raw()
193 			    int val, int val2, long mask)  in ti_dac_write_raw()  argument
196 	u8 power = ti_dac_get_power(ti_dac, ti_dac->powerdown);  in ti_dac_write_raw()
199 	switch (mask) {  in ti_dac_write_raw()
201 		if (ti_dac->val == val)  in ti_dac_write_raw()
204 		if (val >= (1 << ti_dac->resolution) || val < 0)  in ti_dac_write_raw()
205 			return -EINVAL;  in ti_dac_write_raw()
207 		if (ti_dac->powerdown)  in ti_dac_write_raw()
208 			return -EBUSY;  in ti_dac_write_raw()
210 		mutex_lock(&ti_dac->lock);  in ti_dac_write_raw()
213 			ti_dac->val = val;  in ti_dac_write_raw()
214 		mutex_unlock(&ti_dac->lock);  in ti_dac_write_raw()
218 		ret = -EINVAL;  in ti_dac_write_raw()
225 				    struct iio_chan_spec const *chan, long mask)  in ti_dac_write_raw_get_fmt()  argument
238 	struct device *dev = &spi->dev;  in ti_dac_probe()
247 		return -ENOMEM;  in ti_dac_probe()
250 	spi->mode = SPI_MODE_1;  in ti_dac_probe()
251 	spi->bits_per_word = 16;  in ti_dac_probe()
254 	indio_dev->info = &ti_dac_info;  in ti_dac_probe()
255 	indio_dev->name = spi_get_device_id(spi)->name;  in ti_dac_probe()
256 	indio_dev->modes = INDIO_DIRECT_MODE;  in ti_dac_probe()
257 	indio_dev->channels = ti_dac_channels;  in ti_dac_probe()
261 	ti_dac->powerdown = false;  in ti_dac_probe()
262 	ti_dac->spi = spi;  in ti_dac_probe()
264 	spec = &ti_dac_spec[spi_get_device_id(spi)->driver_data];  in ti_dac_probe()
265 	indio_dev->num_channels = 1;  in ti_dac_probe()
266 	ti_dac->resolution = spec->resolution;  in ti_dac_probe()
268 	ti_dac->vref = devm_regulator_get(dev, "vref");  in ti_dac_probe()
269 	if (IS_ERR(ti_dac->vref))  in ti_dac_probe()
270 		return dev_err_probe(dev, PTR_ERR(ti_dac->vref),  in ti_dac_probe()
273 	ret = regulator_enable(ti_dac->vref);  in ti_dac_probe()
279 	mutex_init(&ti_dac->lock);  in ti_dac_probe()
290 	mutex_destroy(&ti_dac->lock);  in ti_dac_probe()
291 	regulator_disable(ti_dac->vref);  in ti_dac_probe()
301 	mutex_destroy(&ti_dac->lock);  in ti_dac_remove()
302 	regulator_disable(ti_dac->vref);  in ti_dac_remove()
323 		.name		= "ti-dac7311",
332 MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@essensium.com>");
333 MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1-channel DAC driver");