Lines Matching defs:adc

57 static int mcp3911_read(struct mcp3911 *adc, u8 reg, u32 *val, u8 len)
61 	reg = MCP3911_REG_READ(reg, adc->dev_addr);
62 	ret = spi_write_then_read(adc->spi, &reg, 1, val, len);
68 	dev_dbg(&adc->spi->dev, "reading 0x%x from register 0x%x\n", *val,
73 static int mcp3911_write(struct mcp3911 *adc, u8 reg, u32 val, u8 len)
75 	dev_dbg(&adc->spi->dev, "writing 0x%x to register 0x%x\n", val, reg);
79 	val |= MCP3911_REG_WRITE(reg, adc->dev_addr);
81 	return spi_write(adc->spi, &val, len + 1);
84 static int mcp3911_update(struct mcp3911 *adc, u8 reg, u32 mask,
90 	ret = mcp3911_read(adc, reg, &tmp, len);
96 	return mcp3911_write(adc, reg, val, len);
103 	struct mcp3911 *adc = iio_priv(indio_dev);
106 	mutex_lock(&adc->lock);
109 		ret = mcp3911_read(adc,
120 		ret = mcp3911_read(adc,
129 		if (adc->vref) {
130 			ret = regulator_get_voltage(adc->vref);
156 	mutex_unlock(&adc->lock);
164 	struct mcp3911 *adc = iio_priv(indio_dev);
167 	mutex_lock(&adc->lock);
176 		ret = mcp3911_write(adc, MCP3911_OFFCAL(channel->channel), val,
182 		ret = mcp3911_update(adc, MCP3911_REG_STATUSCOM,
189 	mutex_unlock(&adc->lock);
212 static int mcp3911_config(struct mcp3911 *adc, struct device_node *of_node)
217 	of_property_read_u32(of_node, "device-addr", &adc->dev_addr);
218 	if (adc->dev_addr > 3) {
219 		dev_err(&adc->spi->dev,
221 			adc->dev_addr);
224 	dev_dbg(&adc->spi->dev, "use device address %i\n", adc->dev_addr);
226 	ret = mcp3911_read(adc, MCP3911_REG_CONFIG, &configreg, 2);
230 	if (adc->vref) {
231 		dev_dbg(&adc->spi->dev, "use external voltage reference\n");
234 		dev_dbg(&adc->spi->dev,
239 	if (adc->clki) {
240 		dev_dbg(&adc->spi->dev, "use external clock as clocksource\n");
243 		dev_dbg(&adc->spi->dev,
248 	return  mcp3911_write(adc, MCP3911_REG_CONFIG, configreg, 2);
254 	struct mcp3911 *adc;
257 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
261 	adc = iio_priv(indio_dev);
262 	adc->spi = spi;
264 	adc->vref = devm_regulator_get_optional(&adc->spi->dev, "vref");
265 	if (IS_ERR(adc->vref)) {
266 		if (PTR_ERR(adc->vref) == -ENODEV) {
267 			adc->vref = NULL;
269 			dev_err(&adc->spi->dev,
271 				PTR_ERR(adc->vref));
272 			return PTR_ERR(adc->vref);
276 		ret = regulator_enable(adc->vref);
281 	adc->clki = devm_clk_get(&adc->spi->dev, NULL);
282 	if (IS_ERR(adc->clki)) {
283 		if (PTR_ERR(adc->clki) == -ENOENT) {
284 			adc->clki = NULL;
286 			dev_err(&adc->spi->dev,
287 				"failed to get adc clk (%ld)\n",
288 				PTR_ERR(adc->clki));
289 			ret = PTR_ERR(adc->clki);
293 		ret = clk_prepare_enable(adc->clki);
295 			dev_err(&adc->spi->dev,
301 	ret = mcp3911_config(adc, spi->dev.of_node);
313 	mutex_init(&adc->lock);
322 	clk_disable_unprepare(adc->clki);
324 	if (adc->vref)
325 		regulator_disable(adc->vref);
333 	struct mcp3911 *adc = iio_priv(indio_dev);
337 	clk_disable_unprepare(adc->clki);
338 	if (adc->vref)
339 		regulator_disable(adc->vref);