1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net>
30  * The PCF8591 control byte
51  * Channel selection
52  * 0x00 = channel 0
53  * 0x01 = channel 1
54  * 0x02 = channel 2
55  * 0x03 = channel 3
64 #define REG_TO_SIGNED(reg)	(((reg) & 0x80) ? ((reg) - 256) : (reg))
70 	u8 control;  member
75 static int pcf8591_read_channel(struct device *dev, int channel);
78 #define show_in_channel(channel)					\  argument
79 static ssize_t show_in##channel##_input(struct device *dev,		\
83 	return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
85 static DEVICE_ATTR(in##channel##_input, S_IRUGO,			\
86 		   show_in##channel##_input, NULL);
97 	return sprintf(buf, "%d\n", data->aout * 10);  in out0_output_show()
115 		return -EINVAL;  in out0_output_store()
117 	data->aout = val;  in out0_output_store()
118 	i2c_smbus_write_byte_data(client, data->control, data->aout);  in out0_output_store()
128 	return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));  in out0_enable_show()
144 	mutex_lock(&data->update_lock);  in out0_enable_store()
146 		data->control |= PCF8591_CONTROL_AOEF;  in out0_enable_store()
148 		data->control &= ~PCF8591_CONTROL_AOEF;  in out0_enable_store()
149 	i2c_smbus_write_byte(client, data->control);  in out0_enable_store()
150 	mutex_unlock(&data->update_lock);  in out0_enable_store()
187 	data = devm_kzalloc(&client->dev, sizeof(struct pcf8591_data),  in pcf8591_probe()
190 		return -ENOMEM;  in pcf8591_probe()
193 	mutex_init(&data->update_lock);  in pcf8591_probe()
199 	err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_probe()
205 		err = device_create_file(&client->dev, &dev_attr_in2_input);  in pcf8591_probe()
212 		err = device_create_file(&client->dev, &dev_attr_in3_input);  in pcf8591_probe()
217 	data->hwmon_dev = hwmon_device_register(&client->dev);  in pcf8591_probe()
218 	if (IS_ERR(data->hwmon_dev)) {  in pcf8591_probe()
219 		err = PTR_ERR(data->hwmon_dev);  in pcf8591_probe()
226 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);  in pcf8591_probe()
227 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_probe()
235 	hwmon_device_unregister(data->hwmon_dev);  in pcf8591_remove()
236 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);  in pcf8591_remove()
237 	sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);  in pcf8591_remove()
244 	data->control = PCF8591_INIT_CONTROL;  in pcf8591_init_client()
245 	data->aout = PCF8591_INIT_AOUT;  in pcf8591_init_client()
247 	i2c_smbus_write_byte_data(client, data->control, data->aout);  in pcf8591_init_client()
256 static int pcf8591_read_channel(struct device *dev, int channel)  in pcf8591_read_channel()  argument
262 	mutex_lock(&data->update_lock);  in pcf8591_read_channel()
264 	if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {  in pcf8591_read_channel()
265 		data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)  in pcf8591_read_channel()
266 			      | channel;  in pcf8591_read_channel()
267 		i2c_smbus_write_byte(client, data->control);  in pcf8591_read_channel()
277 	mutex_unlock(&data->update_lock);  in pcf8591_read_channel()
279 	if ((channel == 2 && input_mode == 2) ||  in pcf8591_read_channel()
280 	    (channel != 3 && (input_mode == 1 || input_mode == 3)))  in pcf8591_read_channel()