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6c633c30 SM |
1 | /* |
2 | * An hwmon driver for the Analog Devices AD7414 | |
3 | * | |
4 | * Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering | |
5 | * | |
6 | * Copyright (c) 2008 PIKA Technologies | |
7 | * Sean MacLennan <smaclennan@pikatech.com> | |
8 | * | |
9 | * Copyright (c) 2008 Spansion Inc. | |
10 | * Frank Edelhaeuser <frank.edelhaeuser at spansion.com> | |
11 | * (converted to "new style" I2C driver model, removed checkpatch.pl warnings) | |
12 | * | |
13 | * Based on ad7418.c | |
14 | * Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/jiffies.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/sysfs.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
6c633c30 SM |
31 | |
32 | ||
33 | /* AD7414 registers */ | |
34 | #define AD7414_REG_TEMP 0x00 | |
35 | #define AD7414_REG_CONF 0x01 | |
36 | #define AD7414_REG_T_HIGH 0x02 | |
37 | #define AD7414_REG_T_LOW 0x03 | |
38 | ||
39 | static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW }; | |
40 | ||
41 | struct ad7414_data { | |
42 | struct device *hwmon_dev; | |
43 | struct mutex lock; /* atomic read data updates */ | |
44 | char valid; /* !=0 if following fields are valid */ | |
45 | unsigned long next_update; /* In jiffies */ | |
46 | s16 temp_input; /* Register values */ | |
47 | s8 temps[ARRAY_SIZE(AD7414_REG_LIMIT)]; | |
48 | }; | |
49 | ||
50 | /* REG: (0.25C/bit, two's complement) << 6 */ | |
51 | static inline int ad7414_temp_from_reg(s16 reg) | |
52 | { | |
8deeac82 GR |
53 | /* |
54 | * use integer division instead of equivalent right shift to | |
6c633c30 SM |
55 | * guarantee arithmetic shift and preserve the sign |
56 | */ | |
57 | return ((int)reg / 64) * 250; | |
58 | } | |
59 | ||
60 | static inline int ad7414_read(struct i2c_client *client, u8 reg) | |
61 | { | |
90f4102c JD |
62 | if (reg == AD7414_REG_TEMP) |
63 | return i2c_smbus_read_word_swapped(client, reg); | |
64 | else | |
6c633c30 SM |
65 | return i2c_smbus_read_byte_data(client, reg); |
66 | } | |
67 | ||
68 | static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value) | |
69 | { | |
70 | return i2c_smbus_write_byte_data(client, reg, value); | |
71 | } | |
72 | ||
d130d971 | 73 | static struct ad7414_data *ad7414_update_device(struct device *dev) |
6c633c30 SM |
74 | { |
75 | struct i2c_client *client = to_i2c_client(dev); | |
76 | struct ad7414_data *data = i2c_get_clientdata(client); | |
77 | ||
78 | mutex_lock(&data->lock); | |
79 | ||
80 | if (time_after(jiffies, data->next_update) || !data->valid) { | |
81 | int value, i; | |
82 | ||
83 | dev_dbg(&client->dev, "starting ad7414 update\n"); | |
84 | ||
85 | value = ad7414_read(client, AD7414_REG_TEMP); | |
86 | if (value < 0) | |
87 | dev_dbg(&client->dev, "AD7414_REG_TEMP err %d\n", | |
88 | value); | |
89 | else | |
90 | data->temp_input = value; | |
91 | ||
92 | for (i = 0; i < ARRAY_SIZE(AD7414_REG_LIMIT); ++i) { | |
93 | value = ad7414_read(client, AD7414_REG_LIMIT[i]); | |
94 | if (value < 0) | |
95 | dev_dbg(&client->dev, "AD7414 reg %d err %d\n", | |
96 | AD7414_REG_LIMIT[i], value); | |
97 | else | |
98 | data->temps[i] = value; | |
99 | } | |
100 | ||
101 | data->next_update = jiffies + HZ + HZ / 2; | |
102 | data->valid = 1; | |
103 | } | |
104 | ||
105 | mutex_unlock(&data->lock); | |
106 | ||
107 | return data; | |
108 | } | |
109 | ||
110 | static ssize_t show_temp_input(struct device *dev, | |
111 | struct device_attribute *attr, char *buf) | |
112 | { | |
113 | struct ad7414_data *data = ad7414_update_device(dev); | |
114 | return sprintf(buf, "%d\n", ad7414_temp_from_reg(data->temp_input)); | |
115 | } | |
116 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); | |
117 | ||
118 | static ssize_t show_max_min(struct device *dev, struct device_attribute *attr, | |
119 | char *buf) | |
120 | { | |
121 | int index = to_sensor_dev_attr(attr)->index; | |
122 | struct ad7414_data *data = ad7414_update_device(dev); | |
123 | return sprintf(buf, "%d\n", data->temps[index] * 1000); | |
124 | } | |
125 | ||
126 | static ssize_t set_max_min(struct device *dev, | |
127 | struct device_attribute *attr, | |
128 | const char *buf, size_t count) | |
129 | { | |
130 | struct i2c_client *client = to_i2c_client(dev); | |
131 | struct ad7414_data *data = i2c_get_clientdata(client); | |
132 | int index = to_sensor_dev_attr(attr)->index; | |
133 | u8 reg = AD7414_REG_LIMIT[index]; | |
dcb7cb97 FM |
134 | long temp; |
135 | int ret = kstrtol(buf, 10, &temp); | |
136 | ||
137 | if (ret < 0) | |
138 | return ret; | |
6c633c30 | 139 | |
2a844c14 | 140 | temp = clamp_val(temp, -40000, 85000); |
6c633c30 SM |
141 | temp = (temp + (temp < 0 ? -500 : 500)) / 1000; |
142 | ||
143 | mutex_lock(&data->lock); | |
144 | data->temps[index] = temp; | |
145 | ad7414_write(client, reg, temp); | |
146 | mutex_unlock(&data->lock); | |
147 | return count; | |
148 | } | |
149 | ||
150 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
151 | show_max_min, set_max_min, 0); | |
152 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, | |
153 | show_max_min, set_max_min, 1); | |
154 | ||
155 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, | |
156 | char *buf) | |
157 | { | |
158 | int bitnr = to_sensor_dev_attr(attr)->index; | |
159 | struct ad7414_data *data = ad7414_update_device(dev); | |
160 | int value = (data->temp_input >> bitnr) & 1; | |
161 | return sprintf(buf, "%d\n", value); | |
162 | } | |
163 | ||
164 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 3); | |
165 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
166 | ||
167 | static struct attribute *ad7414_attributes[] = { | |
168 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
169 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
170 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
171 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
172 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
173 | NULL | |
174 | }; | |
175 | ||
176 | static const struct attribute_group ad7414_group = { | |
177 | .attrs = ad7414_attributes, | |
178 | }; | |
179 | ||
180 | static int ad7414_probe(struct i2c_client *client, | |
181 | const struct i2c_device_id *dev_id) | |
182 | { | |
183 | struct ad7414_data *data; | |
184 | int conf; | |
f0030d87 | 185 | int err; |
6c633c30 SM |
186 | |
187 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
0fee6591 GR |
188 | I2C_FUNC_SMBUS_READ_WORD_DATA)) |
189 | return -EOPNOTSUPP; | |
6c633c30 | 190 | |
0fee6591 GR |
191 | data = devm_kzalloc(&client->dev, sizeof(struct ad7414_data), |
192 | GFP_KERNEL); | |
193 | if (!data) | |
194 | return -ENOMEM; | |
6c633c30 SM |
195 | |
196 | i2c_set_clientdata(client, data); | |
197 | mutex_init(&data->lock); | |
198 | ||
199 | dev_info(&client->dev, "chip found\n"); | |
200 | ||
201 | /* Make sure the chip is powered up. */ | |
202 | conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF); | |
203 | if (conf < 0) | |
204 | dev_warn(&client->dev, | |
205 | "ad7414_probe unable to read config register.\n"); | |
206 | else { | |
207 | conf &= ~(1 << 7); | |
208 | i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf); | |
209 | } | |
210 | ||
211 | /* Register sysfs hooks */ | |
212 | err = sysfs_create_group(&client->dev.kobj, &ad7414_group); | |
213 | if (err) | |
0fee6591 | 214 | return err; |
6c633c30 SM |
215 | |
216 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
217 | if (IS_ERR(data->hwmon_dev)) { | |
218 | err = PTR_ERR(data->hwmon_dev); | |
219 | goto exit_remove; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | ||
224 | exit_remove: | |
225 | sysfs_remove_group(&client->dev.kobj, &ad7414_group); | |
6c633c30 SM |
226 | return err; |
227 | } | |
228 | ||
281dfd0b | 229 | static int ad7414_remove(struct i2c_client *client) |
6c633c30 SM |
230 | { |
231 | struct ad7414_data *data = i2c_get_clientdata(client); | |
232 | ||
233 | hwmon_device_unregister(data->hwmon_dev); | |
234 | sysfs_remove_group(&client->dev.kobj, &ad7414_group); | |
6c633c30 SM |
235 | return 0; |
236 | } | |
237 | ||
238 | static const struct i2c_device_id ad7414_id[] = { | |
239 | { "ad7414", 0 }, | |
240 | {} | |
241 | }; | |
6407deb5 | 242 | MODULE_DEVICE_TABLE(i2c, ad7414_id); |
6c633c30 SM |
243 | |
244 | static struct i2c_driver ad7414_driver = { | |
245 | .driver = { | |
246 | .name = "ad7414", | |
247 | }, | |
248 | .probe = ad7414_probe, | |
9e5e9b7a | 249 | .remove = ad7414_remove, |
6c633c30 SM |
250 | .id_table = ad7414_id, |
251 | }; | |
252 | ||
f0967eea | 253 | module_i2c_driver(ad7414_driver); |
6c633c30 SM |
254 | |
255 | MODULE_AUTHOR("Stefan Roese <sr at denx.de>, " | |
256 | "Frank Edelhaeuser <frank.edelhaeuser at spansion.com>"); | |
257 | ||
258 | MODULE_DESCRIPTION("AD7414 driver"); | |
259 | MODULE_LICENSE("GPL"); |