1 // SPDX-License-Identifier: GPL-2.0-only
3  * ti-dac082s085.c - Texas Instruments 8/10/12-bit 2/4-channel DAC driver
38  * struct ti_dac_chip - TI DAC chip
64 #define POWERDOWN(mode) 	(0x30 | ((mode) + 1) << 6)  argument
68 	u8 shift = 12 - ti_dac->resolution;  in ti_dac_cmd()
70 	ti_dac->buf[0] = cmd | (val >> (8 - shift));  in ti_dac_cmd()
71 	ti_dac->buf[1] = (val << shift) & 0xff;  in ti_dac_cmd()
72 	return spi_sync(ti_dac->mesg.spi, &ti_dac->mesg);  in ti_dac_cmd()
84 	return ti_dac->powerdown_mode;  in ti_dac_get_powerdown_mode()
89 				     unsigned int mode)  in ti_dac_set_powerdown_mode()  argument
94 	if (ti_dac->powerdown_mode == mode)  in ti_dac_set_powerdown_mode()
97 	mutex_lock(&ti_dac->lock);  in ti_dac_set_powerdown_mode()
98 	if (ti_dac->powerdown) {  in ti_dac_set_powerdown_mode()
99 		ret = ti_dac_cmd(ti_dac, POWERDOWN(mode), 0);  in ti_dac_set_powerdown_mode()
103 	ti_dac->powerdown_mode = mode;  in ti_dac_set_powerdown_mode()
106 	mutex_unlock(&ti_dac->lock);  in ti_dac_set_powerdown_mode()
124 	return sysfs_emit(buf, "%d\n", ti_dac->powerdown);  in ti_dac_read_powerdown()
140 	if (ti_dac->powerdown == powerdown)  in ti_dac_write_powerdown()
143 	mutex_lock(&ti_dac->lock);  in ti_dac_write_powerdown()
145 		ret = ti_dac_cmd(ti_dac, POWERDOWN(ti_dac->powerdown_mode), 0);  in ti_dac_write_powerdown()
147 		ret = ti_dac_cmd(ti_dac, WRITE_AND_UPDATE(0), ti_dac->val[0]);  in ti_dac_write_powerdown()
149 		ti_dac->powerdown = powerdown;  in ti_dac_write_powerdown()
150 	mutex_unlock(&ti_dac->lock);  in ti_dac_write_powerdown()
188 			   int *val, int *val2, long mask)  in ti_dac_read_raw()  argument
193 	switch (mask) {  in ti_dac_read_raw()
195 		*val = ti_dac->val[chan->channel];  in ti_dac_read_raw()
200 		ret = regulator_get_voltage(ti_dac->vref);  in ti_dac_read_raw()
205 		*val2 = ti_dac->resolution;  in ti_dac_read_raw()
210 		ret = -EINVAL;  in ti_dac_read_raw()
218 			    int val, int val2, long mask)  in ti_dac_write_raw()  argument
223 	switch (mask) {  in ti_dac_write_raw()
225 		if (ti_dac->val[chan->channel] == val)  in ti_dac_write_raw()
228 		if (val >= (1 << ti_dac->resolution) || val < 0)  in ti_dac_write_raw()
229 			return -EINVAL;  in ti_dac_write_raw()
231 		if (ti_dac->powerdown)  in ti_dac_write_raw()
232 			return -EBUSY;  in ti_dac_write_raw()
234 		mutex_lock(&ti_dac->lock);  in ti_dac_write_raw()
235 		ret = ti_dac_cmd(ti_dac, WRITE_AND_UPDATE(chan->channel), val);  in ti_dac_write_raw()
237 			ti_dac->val[chan->channel] = val;  in ti_dac_write_raw()
238 		mutex_unlock(&ti_dac->lock);  in ti_dac_write_raw()
242 		ret = -EINVAL;  in ti_dac_write_raw()
249 				    struct iio_chan_spec const *chan, long mask)  in ti_dac_write_raw_get_fmt()  argument
262 	struct device *dev = &spi->dev;  in ti_dac_probe()
270 		return -ENOMEM;  in ti_dac_probe()
272 	indio_dev->info = &ti_dac_info;  in ti_dac_probe()
273 	indio_dev->name = spi->modalias;  in ti_dac_probe()
274 	indio_dev->modes = INDIO_DIRECT_MODE;  in ti_dac_probe()
275 	indio_dev->channels = ti_dac_channels;  in ti_dac_probe()
279 	ti_dac->xfer.tx_buf = &ti_dac->buf;  in ti_dac_probe()
280 	ti_dac->xfer.len = sizeof(ti_dac->buf);  in ti_dac_probe()
281 	spi_message_init_with_transfers(&ti_dac->mesg, &ti_dac->xfer, 1);  in ti_dac_probe()
282 	ti_dac->mesg.spi = spi;  in ti_dac_probe()
284 	spec = &ti_dac_spec[spi_get_device_id(spi)->driver_data];  in ti_dac_probe()
285 	indio_dev->num_channels = spec->num_channels;  in ti_dac_probe()
286 	ti_dac->resolution = spec->resolution;  in ti_dac_probe()
288 	ti_dac->vref = devm_regulator_get(dev, "vref");  in ti_dac_probe()
289 	if (IS_ERR(ti_dac->vref))  in ti_dac_probe()
290 		return PTR_ERR(ti_dac->vref);  in ti_dac_probe()
292 	ret = regulator_enable(ti_dac->vref);  in ti_dac_probe()
296 	mutex_init(&ti_dac->lock);  in ti_dac_probe()
311 	mutex_destroy(&ti_dac->lock);  in ti_dac_probe()
312 	regulator_disable(ti_dac->vref);  in ti_dac_probe()
322 	mutex_destroy(&ti_dac->lock);  in ti_dac_remove()
323 	regulator_disable(ti_dac->vref);  in ti_dac_remove()
350 		.name		= "ti-dac082s085",
360 MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 2/4-channel DAC driver");