Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze
[linux-2.6-microblaze.git] / drivers / hwmon / tmp103.c
1 /*
2  * Texas Instruments TMP103 SMBus temperature sensor driver
3  * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
4  *
5  * Based on:
6  * Texas Instruments TMP102 SMBus temperature sensor driver
7  *
8  * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
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 as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  */
21
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/i2c.h>
26 #include <linux/hwmon.h>
27 #include <linux/hwmon-sysfs.h>
28 #include <linux/err.h>
29 #include <linux/mutex.h>
30 #include <linux/device.h>
31 #include <linux/jiffies.h>
32 #include <linux/regmap.h>
33
34 #define TMP103_TEMP_REG         0x00
35 #define TMP103_CONF_REG         0x01
36 #define TMP103_TLOW_REG         0x02
37 #define TMP103_THIGH_REG        0x03
38
39 #define TMP103_CONF_M0          0x01
40 #define TMP103_CONF_M1          0x02
41 #define TMP103_CONF_LC          0x04
42 #define TMP103_CONF_FL          0x08
43 #define TMP103_CONF_FH          0x10
44 #define TMP103_CONF_CR0         0x20
45 #define TMP103_CONF_CR1         0x40
46 #define TMP103_CONF_ID          0x80
47 #define TMP103_CONF_SD          (TMP103_CONF_M1)
48 #define TMP103_CONF_SD_MASK     (TMP103_CONF_M0 | TMP103_CONF_M1)
49
50 #define TMP103_CONFIG           (TMP103_CONF_CR1 | TMP103_CONF_M1)
51 #define TMP103_CONFIG_MASK      (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
52                                  TMP103_CONF_M0 | TMP103_CONF_M1)
53
54 static inline int tmp103_reg_to_mc(s8 val)
55 {
56         return val * 1000;
57 }
58
59 static inline u8 tmp103_mc_to_reg(int val)
60 {
61         return DIV_ROUND_CLOSEST(val, 1000);
62 }
63
64 static ssize_t tmp103_show_temp(struct device *dev,
65                                 struct device_attribute *attr,
66                                 char *buf)
67 {
68         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
69         struct regmap *regmap = dev_get_drvdata(dev);
70         unsigned int regval;
71         int ret;
72
73         ret = regmap_read(regmap, sda->index, &regval);
74         if (ret < 0)
75                 return ret;
76
77         return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
78 }
79
80 static ssize_t tmp103_set_temp(struct device *dev,
81                                struct device_attribute *attr,
82                                const char *buf, size_t count)
83 {
84         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
85         struct regmap *regmap = dev_get_drvdata(dev);
86         long val;
87         int ret;
88
89         if (kstrtol(buf, 10, &val) < 0)
90                 return -EINVAL;
91
92         val = clamp_val(val, -55000, 127000);
93         ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
94         return ret ? ret : count;
95 }
96
97 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
98                           TMP103_TEMP_REG);
99
100 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
101                           tmp103_set_temp, TMP103_TLOW_REG);
102
103 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
104                           tmp103_set_temp, TMP103_THIGH_REG);
105
106 static struct attribute *tmp103_attrs[] = {
107         &sensor_dev_attr_temp1_input.dev_attr.attr,
108         &sensor_dev_attr_temp1_min.dev_attr.attr,
109         &sensor_dev_attr_temp1_max.dev_attr.attr,
110         NULL
111 };
112 ATTRIBUTE_GROUPS(tmp103);
113
114 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
115 {
116         return reg == TMP103_TEMP_REG;
117 }
118
119 static const struct regmap_config tmp103_regmap_config = {
120         .reg_bits = 8,
121         .val_bits = 8,
122         .max_register = TMP103_THIGH_REG,
123         .volatile_reg = tmp103_regmap_is_volatile,
124 };
125
126 static int tmp103_probe(struct i2c_client *client,
127                         const struct i2c_device_id *id)
128 {
129         struct device *dev = &client->dev;
130         struct device *hwmon_dev;
131         struct regmap *regmap;
132         int ret;
133
134         regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
135         if (IS_ERR(regmap)) {
136                 dev_err(dev, "failed to allocate register map\n");
137                 return PTR_ERR(regmap);
138         }
139
140         ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
141                                  TMP103_CONFIG);
142         if (ret < 0) {
143                 dev_err(&client->dev, "error writing config register\n");
144                 return ret;
145         }
146
147         i2c_set_clientdata(client, regmap);
148         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
149                                                       regmap, tmp103_groups);
150         return PTR_ERR_OR_ZERO(hwmon_dev);
151 }
152
153 #ifdef CONFIG_PM
154 static int tmp103_suspend(struct device *dev)
155 {
156         struct regmap *regmap = dev_get_drvdata(dev);
157
158         return regmap_update_bits(regmap, TMP103_CONF_REG,
159                                   TMP103_CONF_SD_MASK, 0);
160 }
161
162 static int tmp103_resume(struct device *dev)
163 {
164         struct regmap *regmap = dev_get_drvdata(dev);
165
166         return regmap_update_bits(regmap, TMP103_CONF_REG,
167                                   TMP103_CONF_SD_MASK, TMP103_CONF_SD);
168 }
169
170 static const struct dev_pm_ops tmp103_dev_pm_ops = {
171         .suspend        = tmp103_suspend,
172         .resume         = tmp103_resume,
173 };
174
175 #define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
176 #else
177 #define TMP103_DEV_PM_OPS NULL
178 #endif /* CONFIG_PM */
179
180 static const struct i2c_device_id tmp103_id[] = {
181         { "tmp103", 0 },
182         { }
183 };
184 MODULE_DEVICE_TABLE(i2c, tmp103_id);
185
186 static struct i2c_driver tmp103_driver = {
187         .driver = {
188                 .name   = "tmp103",
189                 .pm     = TMP103_DEV_PM_OPS,
190         },
191         .probe          = tmp103_probe,
192         .id_table       = tmp103_id,
193 };
194
195 module_i2c_driver(tmp103_driver);
196
197 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
198 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
199 MODULE_LICENSE("GPL");