2  * Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net>
37 	" 0 = four single ended inputs\n"
39 	" 2 = single ended and differential mixed\n"
53  * 0x00 = four single ended inputs
55  * 0x20 = single ended and differential mixed
64  * Channel selection
65  * 0x00 = channel 0
66  * 0x01 = channel 1
67  * 0x02 = channel 2
68  * 0x03 = channel 3
77 #define REG_TO_SIGNED(reg)	(((reg) & 0x80) ? ((reg) - 256) : (reg))
88 static int pcf8591_read_channel(struct device *dev, int channel);
91 #define show_in_channel(channel)					\  argument
92 static ssize_t show_in##channel##_input(struct device *dev,		\
96 	return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
98 static DEVICE_ATTR(in##channel##_input, S_IRUGO,			\
99 		   show_in##channel##_input, NULL);
110 	return sprintf(buf, "%d\n", data->aout * 10);  in out0_output_show()
128 		return -EINVAL;  in out0_output_store()
130 	data->aout = val;  in out0_output_store()
131 	i2c_smbus_write_byte_data(client, data->control, data->aout);  in out0_output_store()
141 	return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));  in out0_enable_show()
157 	mutex_lock(&data->update_lock);  in out0_enable_store()
159 		data->control |= PCF8591_CONTROL_AOEF;  in out0_enable_store()
161 		data->control &= ~PCF8591_CONTROL_AOEF;  in out0_enable_store()
162 	i2c_smbus_write_byte(client, data->control);  in out0_enable_store()
163 	mutex_unlock(&data->update_lock);  in out0_enable_store()
201 	data = devm_kzalloc(&client->dev, sizeof(struct pcf8591_data),  in pcf8591_probe()
204 		return -ENOMEM;  in pcf8591_probe()
207 	mutex_init(&data->update_lock);  in pcf8591_probe()
213 	err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_probe()
219 		err = device_create_file(&client->dev, &dev_attr_in2_input);  in pcf8591_probe()
224 	/* Register input3 only in "four single ended inputs" mode */  in pcf8591_probe()
226 		err = device_create_file(&client->dev, &dev_attr_in3_input);  in pcf8591_probe()
231 	data->hwmon_dev = hwmon_device_register(&client->dev);  in pcf8591_probe()
232 	if (IS_ERR(data->hwmon_dev)) {  in pcf8591_probe()
233 		err = PTR_ERR(data->hwmon_dev);  in pcf8591_probe()
240 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);  in pcf8591_probe()
241 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_probe()
249 	hwmon_device_unregister(data->hwmon_dev);  in pcf8591_remove()
250 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);  in pcf8591_remove()
251 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_remove()
259 	data->control = PCF8591_INIT_CONTROL;  in pcf8591_init_client()
260 	data->aout = PCF8591_INIT_AOUT;  in pcf8591_init_client()
262 	i2c_smbus_write_byte_data(client, data->control, data->aout);  in pcf8591_init_client()
271 static int pcf8591_read_channel(struct device *dev, int channel)  in pcf8591_read_channel()  argument
277 	mutex_lock(&data->update_lock);  in pcf8591_read_channel()
279 	if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {  in pcf8591_read_channel()
280 		data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)  in pcf8591_read_channel()
281 			      | channel;  in pcf8591_read_channel()
282 		i2c_smbus_write_byte(client, data->control);  in pcf8591_read_channel()
292 	mutex_unlock(&data->update_lock);  in pcf8591_read_channel()
294 	if ((channel == 2 && input_mode == 2) ||  in pcf8591_read_channel()
295 	    (channel != 3 && (input_mode == 1 || input_mode == 3)))  in pcf8591_read_channel()