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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 { | |
337076f9 | 47 | struct i2c_client *client; |
2d8dd65f AZ |
48 | enum chips type; |
49 | struct mutex lock; | |
50 | int adc_max; /* number of ADC channels */ | |
51 | char valid; | |
52 | unsigned long last_updated; /* In jiffies */ | |
53 | s16 temp[3]; /* Register values */ | |
54 | u16 in[4]; | |
55 | }; | |
56 | ||
2d8dd65f AZ |
57 | static struct ad7418_data *ad7418_update_device(struct device *dev) |
58 | { | |
337076f9 AL |
59 | struct ad7418_data *data = dev_get_drvdata(dev); |
60 | struct i2c_client *client = data->client; | |
2d8dd65f AZ |
61 | |
62 | mutex_lock(&data->lock); | |
63 | ||
64 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
65 | || !data->valid) { | |
66 | u8 cfg; | |
67 | int i, ch; | |
68 | ||
69 | /* read config register and clear channel bits */ | |
70 | cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
71 | cfg &= 0x1F; | |
72 | ||
73 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, | |
74 | cfg | AD7418_CH_TEMP); | |
75 | udelay(30); | |
76 | ||
77 | for (i = 0; i < 3; i++) { | |
90f4102c JD |
78 | data->temp[i] = |
79 | i2c_smbus_read_word_swapped(client, | |
80 | AD7418_REG_TEMP[i]); | |
2d8dd65f AZ |
81 | } |
82 | ||
83 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { | |
84 | i2c_smbus_write_byte_data(client, | |
85 | AD7418_REG_CONF, | |
86 | cfg | AD7418_REG_ADC_CH(ch)); | |
87 | ||
88 | udelay(15); | |
89 | data->in[data->adc_max - 1 - i] = | |
90f4102c JD |
90 | i2c_smbus_read_word_swapped(client, |
91 | AD7418_REG_ADC); | |
2d8dd65f AZ |
92 | } |
93 | ||
94 | /* restore old configuration value */ | |
90f4102c | 95 | i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg); |
2d8dd65f AZ |
96 | |
97 | data->last_updated = jiffies; | |
98 | data->valid = 1; | |
99 | } | |
100 | ||
101 | mutex_unlock(&data->lock); | |
102 | ||
103 | return data; | |
104 | } | |
105 | ||
106 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, | |
107 | char *buf) | |
108 | { | |
109 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
110 | struct ad7418_data *data = ad7418_update_device(dev); | |
111 | return sprintf(buf, "%d\n", | |
112 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
113 | } | |
114 | ||
115 | static ssize_t show_adc(struct device *dev, struct device_attribute *devattr, | |
116 | char *buf) | |
117 | { | |
118 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
119 | struct ad7418_data *data = ad7418_update_device(dev); | |
120 | ||
121 | return sprintf(buf, "%d\n", | |
122 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); | |
123 | } | |
124 | ||
125 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, | |
126 | const char *buf, size_t count) | |
127 | { | |
128 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
337076f9 AL |
129 | struct ad7418_data *data = dev_get_drvdata(dev); |
130 | struct i2c_client *client = data->client; | |
e91aef22 FM |
131 | long temp; |
132 | int ret = kstrtol(buf, 10, &temp); | |
133 | ||
134 | if (ret < 0) | |
135 | return ret; | |
2d8dd65f AZ |
136 | |
137 | mutex_lock(&data->lock); | |
138 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); | |
90f4102c JD |
139 | i2c_smbus_write_word_swapped(client, |
140 | AD7418_REG_TEMP[attr->index], | |
141 | data->temp[attr->index]); | |
2d8dd65f AZ |
142 | mutex_unlock(&data->lock); |
143 | return count; | |
144 | } | |
145 | ||
146 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); | |
147 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
148 | show_temp, set_temp, 1); | |
149 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
150 | show_temp, set_temp, 2); | |
151 | ||
152 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0); | |
153 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1); | |
154 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2); | |
155 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3); | |
156 | ||
337076f9 | 157 | static struct attribute *ad7416_attrs[] = { |
2d8dd65f AZ |
158 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
159 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
160 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
161 | NULL | |
162 | }; | |
337076f9 | 163 | ATTRIBUTE_GROUPS(ad7416); |
2d8dd65f | 164 | |
337076f9 | 165 | static struct attribute *ad7417_attrs[] = { |
2d8dd65f AZ |
166 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
167 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
168 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
169 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
170 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
171 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
172 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
173 | NULL | |
174 | }; | |
337076f9 | 175 | ATTRIBUTE_GROUPS(ad7417); |
2d8dd65f | 176 | |
337076f9 | 177 | static struct attribute *ad7418_attrs[] = { |
2d8dd65f AZ |
178 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
179 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
180 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
181 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
182 | NULL | |
183 | }; | |
337076f9 | 184 | ATTRIBUTE_GROUPS(ad7418); |
2d8dd65f | 185 | |
991763a9 AL |
186 | static void ad7418_init_client(struct i2c_client *client) |
187 | { | |
188 | struct ad7418_data *data = i2c_get_clientdata(client); | |
189 | ||
190 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); | |
191 | if (reg < 0) { | |
192 | dev_err(&client->dev, "cannot read configuration register\n"); | |
193 | } else { | |
194 | dev_info(&client->dev, "configuring for mode 1\n"); | |
195 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); | |
196 | ||
197 | if (data->type == ad7417 || data->type == ad7418) | |
198 | i2c_smbus_write_byte_data(client, | |
199 | AD7418_REG_CONF2, 0x00); | |
200 | } | |
201 | } | |
202 | ||
369932f6 JD |
203 | static int ad7418_probe(struct i2c_client *client, |
204 | const struct i2c_device_id *id) | |
2d8dd65f | 205 | { |
337076f9 | 206 | struct device *dev = &client->dev; |
369932f6 | 207 | struct i2c_adapter *adapter = client->adapter; |
2d8dd65f | 208 | struct ad7418_data *data; |
337076f9 AL |
209 | struct device *hwmon_dev; |
210 | const struct attribute_group **attr_groups = NULL; | |
2d8dd65f AZ |
211 | |
212 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
d5282926 GR |
213 | I2C_FUNC_SMBUS_WORD_DATA)) |
214 | return -EOPNOTSUPP; | |
2d8dd65f | 215 | |
337076f9 | 216 | data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); |
d5282926 GR |
217 | if (!data) |
218 | return -ENOMEM; | |
2d8dd65f | 219 | |
2d8dd65f AZ |
220 | i2c_set_clientdata(client, data); |
221 | ||
222 | mutex_init(&data->lock); | |
337076f9 | 223 | data->client = client; |
369932f6 | 224 | data->type = id->driver_data; |
2d8dd65f AZ |
225 | |
226 | switch (data->type) { | |
2d8dd65f AZ |
227 | case ad7416: |
228 | data->adc_max = 0; | |
337076f9 | 229 | attr_groups = ad7416_groups; |
2d8dd65f AZ |
230 | break; |
231 | ||
232 | case ad7417: | |
233 | data->adc_max = 4; | |
337076f9 | 234 | attr_groups = ad7417_groups; |
2d8dd65f AZ |
235 | break; |
236 | ||
237 | case ad7418: | |
238 | data->adc_max = 1; | |
337076f9 | 239 | attr_groups = ad7418_groups; |
2d8dd65f AZ |
240 | break; |
241 | } | |
242 | ||
337076f9 | 243 | dev_info(dev, "%s chip found\n", client->name); |
2d8dd65f AZ |
244 | |
245 | /* Initialize the AD7418 chip */ | |
246 | ad7418_init_client(client); | |
247 | ||
337076f9 AL |
248 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
249 | client->name, | |
250 | data, attr_groups); | |
251 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
2d8dd65f AZ |
252 | } |
253 | ||
991763a9 AL |
254 | static const struct i2c_device_id ad7418_id[] = { |
255 | { "ad7416", ad7416 }, | |
256 | { "ad7417", ad7417 }, | |
257 | { "ad7418", ad7418 }, | |
258 | { } | |
259 | }; | |
260 | MODULE_DEVICE_TABLE(i2c, ad7418_id); | |
261 | ||
262 | static struct i2c_driver ad7418_driver = { | |
263 | .driver = { | |
264 | .name = "ad7418", | |
265 | }, | |
266 | .probe = ad7418_probe, | |
991763a9 AL |
267 | .id_table = ad7418_id, |
268 | }; | |
269 | ||
f0967eea | 270 | module_i2c_driver(ad7418_driver); |
2d8dd65f AZ |
271 | |
272 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
273 | MODULE_DESCRIPTION("AD7416/17/18 driver"); | |
274 | MODULE_LICENSE("GPL"); | |
275 | MODULE_VERSION(DRV_VERSION); |