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2d8dd65f AZ |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
2d8dd65f AZ |
24 | |
25 | #include "lm75.h" | |
26 | ||
369932f6 | 27 | #define DRV_VERSION "0.4" |
2d8dd65f | 28 | |
369932f6 | 29 | enum chips { ad7416, ad7417, ad7418 }; |
2d8dd65f AZ |
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 { | |
1beeffe4 | 47 | struct device *hwmon_dev; |
2d8dd65f AZ |
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 | ||
369932f6 JD |
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); | |
2d8dd65f AZ |
69 | |
70 | static struct i2c_driver ad7418_driver = { | |
71 | .driver = { | |
72 | .name = "ad7418", | |
73 | }, | |
369932f6 JD |
74 | .probe = ad7418_probe, |
75 | .remove = ad7418_remove, | |
76 | .id_table = ad7418_id, | |
2d8dd65f AZ |
77 | }; |
78 | ||
79 | /* All registers are word-sized, except for the configuration registers. | |
80 | * AD7418 uses a high-byte first convention. Do NOT use those functions to | |
81 | * access the configuration registers CONF and CONF2, as they are byte-sized. | |
82 | */ | |
83 | static inline int ad7418_read(struct i2c_client *client, u8 reg) | |
84 | { | |
85 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
86 | } | |
87 | ||
88 | static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value) | |
89 | { | |
90 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
91 | } | |
92 | ||
93 | static void ad7418_init_client(struct i2c_client *client) | |
94 | { | |
95 | struct ad7418_data *data = i2c_get_clientdata(client); | |
96 | ||
97 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
98 | if (reg < 0) { | |
99 | dev_err(&client->dev, "cannot read configuration register\n"); | |
100 | } else { | |
101 | dev_info(&client->dev, "configuring for mode 1\n"); | |
102 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); | |
103 | ||
104 | if (data->type == ad7417 || data->type == ad7418) | |
105 | i2c_smbus_write_byte_data(client, | |
106 | AD7418_REG_CONF2, 0x00); | |
107 | } | |
108 | } | |
109 | ||
110 | static struct ad7418_data *ad7418_update_device(struct device *dev) | |
111 | { | |
112 | struct i2c_client *client = to_i2c_client(dev); | |
113 | struct ad7418_data *data = i2c_get_clientdata(client); | |
114 | ||
115 | mutex_lock(&data->lock); | |
116 | ||
117 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
118 | || !data->valid) { | |
119 | u8 cfg; | |
120 | int i, ch; | |
121 | ||
122 | /* read config register and clear channel bits */ | |
123 | cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
124 | cfg &= 0x1F; | |
125 | ||
126 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, | |
127 | cfg | AD7418_CH_TEMP); | |
128 | udelay(30); | |
129 | ||
130 | for (i = 0; i < 3; i++) { | |
131 | data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]); | |
132 | } | |
133 | ||
134 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { | |
135 | i2c_smbus_write_byte_data(client, | |
136 | AD7418_REG_CONF, | |
137 | cfg | AD7418_REG_ADC_CH(ch)); | |
138 | ||
139 | udelay(15); | |
140 | data->in[data->adc_max - 1 - i] = | |
141 | ad7418_read(client, AD7418_REG_ADC); | |
142 | } | |
143 | ||
144 | /* restore old configuration value */ | |
145 | ad7418_write(client, AD7418_REG_CONF, cfg); | |
146 | ||
147 | data->last_updated = jiffies; | |
148 | data->valid = 1; | |
149 | } | |
150 | ||
151 | mutex_unlock(&data->lock); | |
152 | ||
153 | return data; | |
154 | } | |
155 | ||
156 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, | |
157 | char *buf) | |
158 | { | |
159 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
160 | struct ad7418_data *data = ad7418_update_device(dev); | |
161 | return sprintf(buf, "%d\n", | |
162 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
163 | } | |
164 | ||
165 | static ssize_t show_adc(struct device *dev, struct device_attribute *devattr, | |
166 | char *buf) | |
167 | { | |
168 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
169 | struct ad7418_data *data = ad7418_update_device(dev); | |
170 | ||
171 | return sprintf(buf, "%d\n", | |
172 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); | |
173 | } | |
174 | ||
175 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, | |
176 | const char *buf, size_t count) | |
177 | { | |
178 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
179 | struct i2c_client *client = to_i2c_client(dev); | |
180 | struct ad7418_data *data = i2c_get_clientdata(client); | |
5bfedac0 | 181 | long temp = simple_strtol(buf, NULL, 10); |
2d8dd65f AZ |
182 | |
183 | mutex_lock(&data->lock); | |
184 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); | |
185 | ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]); | |
186 | mutex_unlock(&data->lock); | |
187 | return count; | |
188 | } | |
189 | ||
190 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
191 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
192 | show_temp, set_temp, 1); | |
193 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
194 | show_temp, set_temp, 2); | |
195 | ||
196 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0); | |
197 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1); | |
198 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2); | |
199 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3); | |
200 | ||
2d8dd65f AZ |
201 | static struct attribute *ad7416_attributes[] = { |
202 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
203 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
204 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
205 | NULL | |
206 | }; | |
207 | ||
208 | static struct attribute *ad7417_attributes[] = { | |
209 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
210 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
211 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
212 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
213 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
214 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
215 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
216 | NULL | |
217 | }; | |
218 | ||
219 | static struct attribute *ad7418_attributes[] = { | |
220 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
221 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
222 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
223 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
224 | NULL | |
225 | }; | |
226 | ||
369932f6 JD |
227 | static int ad7418_probe(struct i2c_client *client, |
228 | const struct i2c_device_id *id) | |
2d8dd65f | 229 | { |
369932f6 | 230 | struct i2c_adapter *adapter = client->adapter; |
2d8dd65f | 231 | struct ad7418_data *data; |
369932f6 | 232 | int err; |
2d8dd65f AZ |
233 | |
234 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
369932f6 JD |
235 | I2C_FUNC_SMBUS_WORD_DATA)) { |
236 | err = -EOPNOTSUPP; | |
2d8dd65f | 237 | goto exit; |
369932f6 | 238 | } |
2d8dd65f AZ |
239 | |
240 | if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) { | |
241 | err = -ENOMEM; | |
242 | goto exit; | |
243 | } | |
244 | ||
2d8dd65f AZ |
245 | i2c_set_clientdata(client, data); |
246 | ||
247 | mutex_init(&data->lock); | |
369932f6 | 248 | data->type = id->driver_data; |
2d8dd65f AZ |
249 | |
250 | switch (data->type) { | |
2d8dd65f AZ |
251 | case ad7416: |
252 | data->adc_max = 0; | |
253 | data->attrs.attrs = ad7416_attributes; | |
2d8dd65f AZ |
254 | break; |
255 | ||
256 | case ad7417: | |
257 | data->adc_max = 4; | |
258 | data->attrs.attrs = ad7417_attributes; | |
2d8dd65f AZ |
259 | break; |
260 | ||
261 | case ad7418: | |
262 | data->adc_max = 1; | |
263 | data->attrs.attrs = ad7418_attributes; | |
2d8dd65f AZ |
264 | break; |
265 | } | |
266 | ||
2d8dd65f AZ |
267 | dev_info(&client->dev, "%s chip found\n", client->name); |
268 | ||
269 | /* Initialize the AD7418 chip */ | |
270 | ad7418_init_client(client); | |
271 | ||
272 | /* Register sysfs hooks */ | |
273 | if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs))) | |
369932f6 | 274 | goto exit_free; |
2d8dd65f | 275 | |
1beeffe4 TJ |
276 | data->hwmon_dev = hwmon_device_register(&client->dev); |
277 | if (IS_ERR(data->hwmon_dev)) { | |
278 | err = PTR_ERR(data->hwmon_dev); | |
2d8dd65f AZ |
279 | goto exit_remove; |
280 | } | |
281 | ||
282 | return 0; | |
283 | ||
284 | exit_remove: | |
285 | sysfs_remove_group(&client->dev.kobj, &data->attrs); | |
2d8dd65f AZ |
286 | exit_free: |
287 | kfree(data); | |
288 | exit: | |
289 | return err; | |
290 | } | |
291 | ||
369932f6 | 292 | static int ad7418_remove(struct i2c_client *client) |
2d8dd65f AZ |
293 | { |
294 | struct ad7418_data *data = i2c_get_clientdata(client); | |
1beeffe4 | 295 | hwmon_device_unregister(data->hwmon_dev); |
2d8dd65f | 296 | sysfs_remove_group(&client->dev.kobj, &data->attrs); |
2d8dd65f AZ |
297 | kfree(data); |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int __init ad7418_init(void) | |
302 | { | |
303 | return i2c_add_driver(&ad7418_driver); | |
304 | } | |
305 | ||
306 | static void __exit ad7418_exit(void) | |
307 | { | |
308 | i2c_del_driver(&ad7418_driver); | |
309 | } | |
310 | ||
311 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
312 | MODULE_DESCRIPTION("AD7416/17/18 driver"); | |
313 | MODULE_LICENSE("GPL"); | |
314 | MODULE_VERSION(DRV_VERSION); | |
315 | ||
316 | module_init(ad7418_init); | |
317 | module_exit(ad7418_exit); |