10  * ADC<bb><c>S<sss>, where
12  * * c is the number of channels (1, 2, 4, 8)
17  * http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
45 #include <linux/hwmon-sysfs.h>
55 	u32 channels;  member
65 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_read()  local
71 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_read()
72 		return -ERESTARTSYS;  in adcxx_read()
74 	if (adc->channels == 1) {  in adcxx_read()
77 		tx_buf[0] = attr->index << 3; /* other bits are don't care */  in adcxx_read()
90 	value = value * adc->reference >> 12;  in adcxx_read()
93 	mutex_unlock(&adc->lock);  in adcxx_read()
108 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_show_max()  local
111 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_show_max()
112 		return -ERESTARTSYS;  in adcxx_show_max()
114 	reference = adc->reference;  in adcxx_show_max()
116 	mutex_unlock(&adc->lock);  in adcxx_show_max()
125 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_set_max()  local
129 		return -EINVAL;  in adcxx_set_max()
131 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_set_max()
132 		return -ERESTARTSYS;  in adcxx_set_max()
134 	adc->reference = value;  in adcxx_set_max()
136 	mutex_unlock(&adc->lock);  in adcxx_set_max()
144 	return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);  in adcxx_show_name()
162 /*----------------------------------------------------------------------*/
166 	int channels = spi_get_device_id(spi)->driver_data;  in adcxx_probe()  local
167 	struct adcxx *adc;  in adcxx_probe()  local
171 	adc = devm_kzalloc(&spi->dev, sizeof(*adc), GFP_KERNEL);  in adcxx_probe()
172 	if (!adc)  in adcxx_probe()
173 		return -ENOMEM;  in adcxx_probe()
176 	adc->reference = 3300;  in adcxx_probe()
177 	adc->channels = channels;  in adcxx_probe()
178 	mutex_init(&adc->lock);  in adcxx_probe()
180 	mutex_lock(&adc->lock);  in adcxx_probe()
182 	spi_set_drvdata(spi, adc);  in adcxx_probe()
184 	for (i = 0; i < 3 + adc->channels; i++) {  in adcxx_probe()
185 		status = device_create_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_probe()
187 			dev_err(&spi->dev, "device_create_file failed.\n");  in adcxx_probe()
192 	adc->hwmon_dev = hwmon_device_register(&spi->dev);  in adcxx_probe()
193 	if (IS_ERR(adc->hwmon_dev)) {  in adcxx_probe()
194 		dev_err(&spi->dev, "hwmon_device_register failed.\n");  in adcxx_probe()
195 		status = PTR_ERR(adc->hwmon_dev);  in adcxx_probe()
199 	mutex_unlock(&adc->lock);  in adcxx_probe()
203 	for (i--; i >= 0; i--)  in adcxx_probe()
204 		device_remove_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_probe()
206 	mutex_unlock(&adc->lock);  in adcxx_probe()
212 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_remove()  local
215 	mutex_lock(&adc->lock);  in adcxx_remove()
216 	hwmon_device_unregister(adc->hwmon_dev);  in adcxx_remove()
217 	for (i = 0; i < 3 + adc->channels; i++)  in adcxx_remove()
218 		device_remove_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_remove()
220 	mutex_unlock(&adc->lock);  in adcxx_remove()