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1 | /* |
2 | * An hwmon driver for the Analog Devices AD7416/17/18 |
3 | * Copyright (C) 2006-07 Tower Technologies |
4 | * |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
6 | * |
7 | * Based on lm75.c |
8 | * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License, |
12 | * as published by the Free Software Foundation - version 2. |
13 | */ |
14 | |
15 | #include <linux/module.h> |
16 | #include <linux/jiffies.h> |
17 | #include <linux/i2c.h> |
18 | #include <linux/hwmon.h> |
19 | #include <linux/hwmon-sysfs.h> |
20 | #include <linux/err.h> |
21 | #include <linux/mutex.h> |
22 | #include <linux/delay.h> |
23 | #include <linux/slab.h> |
24 | |
25 | #include "lm75.h" |
26 | |
27 | #define DRV_VERSION "0.4" |
28 | |
29 | enum chips { ad7416, ad7417, ad7418 }; |
30 | |
31 | /* AD7418 registers */ |
32 | #define AD7418_REG_TEMP_IN 0x00 |
33 | #define AD7418_REG_CONF 0x01 |
34 | #define AD7418_REG_TEMP_HYST 0x02 |
35 | #define AD7418_REG_TEMP_OS 0x03 |
36 | #define AD7418_REG_ADC 0x04 |
37 | #define AD7418_REG_CONF2 0x05 |
38 | |
39 | #define AD7418_REG_ADC_CH(x) ((x) << 5) |
40 | #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) |
41 | |
42 | static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, |
43 | AD7418_REG_TEMP_HYST, |
44 | AD7418_REG_TEMP_OS }; |
45 | |
46 | struct ad7418_data { |
47 | struct device *hwmon_dev; |
48 | struct attribute_group attrs; |
49 | enum chips type; |
50 | struct mutex lock; |
51 | int adc_max; /* number of ADC channels */ |
52 | char valid; |
53 | unsigned long last_updated; /* In jiffies */ |
54 | s16 temp[3]; /* Register values */ |
55 | u16 in[4]; |
56 | }; |
57 | |
58 | static int ad7418_probe(struct i2c_client *client, |
59 | const struct i2c_device_id *id); |
60 | static int ad7418_remove(struct i2c_client *client); |
61 | |
62 | static const struct i2c_device_id ad7418_id[] = { |
63 | { "ad7416", ad7416 }, |
64 | { "ad7417", ad7417 }, |
65 | { "ad7418", ad7418 }, |
66 | { } |
67 | }; |
68 | MODULE_DEVICE_TABLE(i2c, ad7418_id); |
69 | |
70 | static struct i2c_driver ad7418_driver = { |
71 | .driver = { |
72 | .name = "ad7418", |
73 | }, |
74 | .probe = ad7418_probe, |
75 | .remove = ad7418_remove, |
76 | .id_table = ad7418_id, |
77 | }; |
78 | |
79 | static void ad7418_init_client(struct i2c_client *client) |
80 | { |
81 | struct ad7418_data *data = i2c_get_clientdata(client); |
82 | |
83 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
84 | if (reg < 0) { |
85 | dev_err(&client->dev, "cannot read configuration register\n"); |
86 | } else { |
87 | dev_info(&client->dev, "configuring for mode 1\n"); |
88 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); |
89 | |
90 | if (data->type == ad7417 || data->type == ad7418) |
91 | i2c_smbus_write_byte_data(client, |
92 | AD7418_REG_CONF2, 0x00); |
93 | } |
94 | } |
95 | |
96 | static struct ad7418_data *ad7418_update_device(struct device *dev) |
97 | { |
98 | struct i2c_client *client = to_i2c_client(dev); |
99 | struct ad7418_data *data = i2c_get_clientdata(client); |
100 | |
101 | mutex_lock(&data->lock); |
102 | |
103 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
104 | || !data->valid) { |
105 | u8 cfg; |
106 | int i, ch; |
107 | |
108 | /* read config register and clear channel bits */ |
109 | cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
110 | cfg &= 0x1F; |
111 | |
112 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
113 | cfg | AD7418_CH_TEMP); |
114 | udelay(30); |
115 | |
116 | for (i = 0; i < 3; i++) { |
117 | data->temp[i] = |
118 | i2c_smbus_read_word_swapped(client, |
119 | AD7418_REG_TEMP[i]); |
120 | } |
121 | |
122 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { |
123 | i2c_smbus_write_byte_data(client, |
124 | AD7418_REG_CONF, |
125 | cfg | AD7418_REG_ADC_CH(ch)); |
126 | |
127 | udelay(15); |
128 | data->in[data->adc_max - 1 - i] = |
129 | i2c_smbus_read_word_swapped(client, |
130 | AD7418_REG_ADC); |
131 | } |
132 | |
133 | /* restore old configuration value */ |
134 | i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg); |
135 | |
136 | data->last_updated = jiffies; |
137 | data->valid = 1; |
138 | } |
139 | |
140 | mutex_unlock(&data->lock); |
141 | |
142 | return data; |
143 | } |
144 | |
145 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, |
146 | char *buf) |
147 | { |
148 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
149 | struct ad7418_data *data = ad7418_update_device(dev); |
150 | return sprintf(buf, "%d\n", |
151 | LM75_TEMP_FROM_REG(data->temp[attr->index])); |
152 | } |
153 | |
154 | static ssize_t show_adc(struct device *dev, struct device_attribute *devattr, |
155 | char *buf) |
156 | { |
157 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
158 | struct ad7418_data *data = ad7418_update_device(dev); |
159 | |
160 | return sprintf(buf, "%d\n", |
161 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); |
162 | } |
163 | |
164 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, |
165 | const char *buf, size_t count) |
166 | { |
167 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
168 | struct i2c_client *client = to_i2c_client(dev); |
169 | struct ad7418_data *data = i2c_get_clientdata(client); |
170 | long temp; |
171 | int ret = kstrtol(buf, 10, &temp); |
172 | |
173 | if (ret < 0) |
174 | return ret; |
175 | |
176 | mutex_lock(&data->lock); |
177 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); |
178 | i2c_smbus_write_word_swapped(client, |
179 | AD7418_REG_TEMP[attr->index], |
180 | data->temp[attr->index]); |
181 | mutex_unlock(&data->lock); |
182 | return count; |
183 | } |
184 | |
185 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
186 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, |
187 | show_temp, set_temp, 1); |
188 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
189 | show_temp, set_temp, 2); |
190 | |
191 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0); |
192 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1); |
193 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2); |
194 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3); |
195 | |
196 | static struct attribute *ad7416_attributes[] = { |
197 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
198 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
199 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
200 | NULL |
201 | }; |
202 | |
203 | static struct attribute *ad7417_attributes[] = { |
204 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
205 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
206 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
207 | &sensor_dev_attr_in1_input.dev_attr.attr, |
208 | &sensor_dev_attr_in2_input.dev_attr.attr, |
209 | &sensor_dev_attr_in3_input.dev_attr.attr, |
210 | &sensor_dev_attr_in4_input.dev_attr.attr, |
211 | NULL |
212 | }; |
213 | |
214 | static struct attribute *ad7418_attributes[] = { |
215 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
216 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
217 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
218 | &sensor_dev_attr_in1_input.dev_attr.attr, |
219 | NULL |
220 | }; |
221 | |
222 | static int ad7418_probe(struct i2c_client *client, |
223 | const struct i2c_device_id *id) |
224 | { |
225 | struct i2c_adapter *adapter = client->adapter; |
226 | struct ad7418_data *data; |
227 | int err; |
228 | |
229 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
230 | I2C_FUNC_SMBUS_WORD_DATA)) |
231 | return -EOPNOTSUPP; |
232 | |
233 | data = devm_kzalloc(&client->dev, sizeof(struct ad7418_data), |
234 | GFP_KERNEL); |
235 | if (!data) |
236 | return -ENOMEM; |
237 | |
238 | i2c_set_clientdata(client, data); |
239 | |
240 | mutex_init(&data->lock); |
241 | data->type = id->driver_data; |
242 | |
243 | switch (data->type) { |
244 | case ad7416: |
245 | data->adc_max = 0; |
246 | data->attrs.attrs = ad7416_attributes; |
247 | break; |
248 | |
249 | case ad7417: |
250 | data->adc_max = 4; |
251 | data->attrs.attrs = ad7417_attributes; |
252 | break; |
253 | |
254 | case ad7418: |
255 | data->adc_max = 1; |
256 | data->attrs.attrs = ad7418_attributes; |
257 | break; |
258 | } |
259 | |
260 | dev_info(&client->dev, "%s chip found\n", client->name); |
261 | |
262 | /* Initialize the AD7418 chip */ |
263 | ad7418_init_client(client); |
264 | |
265 | /* Register sysfs hooks */ |
266 | err = sysfs_create_group(&client->dev.kobj, &data->attrs); |
267 | if (err) |
268 | return err; |
269 | |
270 | data->hwmon_dev = hwmon_device_register(&client->dev); |
271 | if (IS_ERR(data->hwmon_dev)) { |
272 | err = PTR_ERR(data->hwmon_dev); |
273 | goto exit_remove; |
274 | } |
275 | |
276 | return 0; |
277 | |
278 | exit_remove: |
279 | sysfs_remove_group(&client->dev.kobj, &data->attrs); |
280 | return err; |
281 | } |
282 | |
283 | static int ad7418_remove(struct i2c_client *client) |
284 | { |
285 | struct ad7418_data *data = i2c_get_clientdata(client); |
286 | hwmon_device_unregister(data->hwmon_dev); |
287 | sysfs_remove_group(&client->dev.kobj, &data->attrs); |
288 | return 0; |
289 | } |
290 | |
291 | module_i2c_driver(ad7418_driver); |
292 | |
293 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
294 | MODULE_DESCRIPTION("AD7416/17/18 driver"); |
295 | MODULE_LICENSE("GPL"); |
296 | MODULE_VERSION(DRV_VERSION); |
297 |
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