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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6c633c30 SM |
2 | /* |
3 | * An hwmon driver for the Analog Devices AD7414 | |
4 | * | |
5 | * Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering | |
6 | * | |
7 | * Copyright (c) 2008 PIKA Technologies | |
8 | * Sean MacLennan <smaclennan@pikatech.com> | |
9 | * | |
10 | * Copyright (c) 2008 Spansion Inc. | |
11 | * Frank Edelhaeuser <frank.edelhaeuser at spansion.com> | |
12 | * (converted to "new style" I2C driver model, removed checkpatch.pl warnings) | |
13 | * | |
14 | * Based on ad7418.c | |
15 | * Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it> | |
6c633c30 SM |
16 | */ |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/hwmon.h> | |
22 | #include <linux/hwmon-sysfs.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/sysfs.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
6c633c30 SM |
27 | |
28 | ||
29 | /* AD7414 registers */ | |
30 | #define AD7414_REG_TEMP 0x00 | |
31 | #define AD7414_REG_CONF 0x01 | |
32 | #define AD7414_REG_T_HIGH 0x02 | |
33 | #define AD7414_REG_T_LOW 0x03 | |
34 | ||
35 | static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW }; | |
36 | ||
37 | struct ad7414_data { | |
045c1391 | 38 | struct i2c_client *client; |
6c633c30 | 39 | struct mutex lock; /* atomic read data updates */ |
952a11ca | 40 | bool valid; /* true if following fields are valid */ |
6c633c30 SM |
41 | unsigned long next_update; /* In jiffies */ |
42 | s16 temp_input; /* Register values */ | |
43 | s8 temps[ARRAY_SIZE(AD7414_REG_LIMIT)]; | |
44 | }; | |
45 | ||
46 | /* REG: (0.25C/bit, two's complement) << 6 */ | |
47 | static inline int ad7414_temp_from_reg(s16 reg) | |
48 | { | |
8deeac82 GR |
49 | /* |
50 | * use integer division instead of equivalent right shift to | |
6c633c30 SM |
51 | * guarantee arithmetic shift and preserve the sign |
52 | */ | |
53 | return ((int)reg / 64) * 250; | |
54 | } | |
55 | ||
56 | static inline int ad7414_read(struct i2c_client *client, u8 reg) | |
57 | { | |
90f4102c JD |
58 | if (reg == AD7414_REG_TEMP) |
59 | return i2c_smbus_read_word_swapped(client, reg); | |
60 | else | |
6c633c30 SM |
61 | return i2c_smbus_read_byte_data(client, reg); |
62 | } | |
63 | ||
64 | static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value) | |
65 | { | |
66 | return i2c_smbus_write_byte_data(client, reg, value); | |
67 | } | |
68 | ||
d130d971 | 69 | static struct ad7414_data *ad7414_update_device(struct device *dev) |
6c633c30 | 70 | { |
045c1391 AL |
71 | struct ad7414_data *data = dev_get_drvdata(dev); |
72 | struct i2c_client *client = data->client; | |
6c633c30 SM |
73 | |
74 | mutex_lock(&data->lock); | |
75 | ||
76 | if (time_after(jiffies, data->next_update) || !data->valid) { | |
77 | int value, i; | |
78 | ||
79 | dev_dbg(&client->dev, "starting ad7414 update\n"); | |
80 | ||
81 | value = ad7414_read(client, AD7414_REG_TEMP); | |
82 | if (value < 0) | |
83 | dev_dbg(&client->dev, "AD7414_REG_TEMP err %d\n", | |
84 | value); | |
85 | else | |
86 | data->temp_input = value; | |
87 | ||
88 | for (i = 0; i < ARRAY_SIZE(AD7414_REG_LIMIT); ++i) { | |
89 | value = ad7414_read(client, AD7414_REG_LIMIT[i]); | |
90 | if (value < 0) | |
91 | dev_dbg(&client->dev, "AD7414 reg %d err %d\n", | |
92 | AD7414_REG_LIMIT[i], value); | |
93 | else | |
94 | data->temps[i] = value; | |
95 | } | |
96 | ||
97 | data->next_update = jiffies + HZ + HZ / 2; | |
952a11ca | 98 | data->valid = true; |
6c633c30 SM |
99 | } |
100 | ||
101 | mutex_unlock(&data->lock); | |
102 | ||
103 | return data; | |
104 | } | |
105 | ||
cbf6cb2b | 106 | static ssize_t temp_input_show(struct device *dev, |
6c633c30 SM |
107 | struct device_attribute *attr, char *buf) |
108 | { | |
109 | struct ad7414_data *data = ad7414_update_device(dev); | |
110 | return sprintf(buf, "%d\n", ad7414_temp_from_reg(data->temp_input)); | |
111 | } | |
cbf6cb2b | 112 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); |
6c633c30 | 113 | |
cbf6cb2b GR |
114 | static ssize_t max_min_show(struct device *dev, struct device_attribute *attr, |
115 | char *buf) | |
6c633c30 SM |
116 | { |
117 | int index = to_sensor_dev_attr(attr)->index; | |
118 | struct ad7414_data *data = ad7414_update_device(dev); | |
119 | return sprintf(buf, "%d\n", data->temps[index] * 1000); | |
120 | } | |
121 | ||
cbf6cb2b GR |
122 | static ssize_t max_min_store(struct device *dev, |
123 | struct device_attribute *attr, const char *buf, | |
124 | size_t count) | |
6c633c30 | 125 | { |
045c1391 AL |
126 | struct ad7414_data *data = dev_get_drvdata(dev); |
127 | struct i2c_client *client = data->client; | |
6c633c30 SM |
128 | int index = to_sensor_dev_attr(attr)->index; |
129 | u8 reg = AD7414_REG_LIMIT[index]; | |
dcb7cb97 FM |
130 | long temp; |
131 | int ret = kstrtol(buf, 10, &temp); | |
132 | ||
133 | if (ret < 0) | |
134 | return ret; | |
6c633c30 | 135 | |
2a844c14 | 136 | temp = clamp_val(temp, -40000, 85000); |
6c633c30 SM |
137 | temp = (temp + (temp < 0 ? -500 : 500)) / 1000; |
138 | ||
139 | mutex_lock(&data->lock); | |
140 | data->temps[index] = temp; | |
141 | ad7414_write(client, reg, temp); | |
142 | mutex_unlock(&data->lock); | |
143 | return count; | |
144 | } | |
145 | ||
cbf6cb2b GR |
146 | static SENSOR_DEVICE_ATTR_RW(temp1_max, max_min, 0); |
147 | static SENSOR_DEVICE_ATTR_RW(temp1_min, max_min, 1); | |
6c633c30 | 148 | |
cbf6cb2b | 149 | static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, |
6c633c30 SM |
150 | char *buf) |
151 | { | |
152 | int bitnr = to_sensor_dev_attr(attr)->index; | |
153 | struct ad7414_data *data = ad7414_update_device(dev); | |
154 | int value = (data->temp_input >> bitnr) & 1; | |
155 | return sprintf(buf, "%d\n", value); | |
156 | } | |
157 | ||
cbf6cb2b GR |
158 | static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 3); |
159 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 4); | |
6c633c30 | 160 | |
045c1391 | 161 | static struct attribute *ad7414_attrs[] = { |
6c633c30 SM |
162 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
163 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
164 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
165 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
166 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
167 | NULL | |
168 | }; | |
169 | ||
045c1391 | 170 | ATTRIBUTE_GROUPS(ad7414); |
6c633c30 | 171 | |
67487038 | 172 | static int ad7414_probe(struct i2c_client *client) |
6c633c30 | 173 | { |
045c1391 | 174 | struct device *dev = &client->dev; |
6c633c30 | 175 | struct ad7414_data *data; |
045c1391 | 176 | struct device *hwmon_dev; |
6c633c30 | 177 | int conf; |
6c633c30 SM |
178 | |
179 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
0fee6591 GR |
180 | I2C_FUNC_SMBUS_READ_WORD_DATA)) |
181 | return -EOPNOTSUPP; | |
6c633c30 | 182 | |
045c1391 | 183 | data = devm_kzalloc(dev, sizeof(struct ad7414_data), GFP_KERNEL); |
0fee6591 GR |
184 | if (!data) |
185 | return -ENOMEM; | |
6c633c30 | 186 | |
045c1391 | 187 | data->client = client; |
6c633c30 SM |
188 | mutex_init(&data->lock); |
189 | ||
190 | dev_info(&client->dev, "chip found\n"); | |
191 | ||
192 | /* Make sure the chip is powered up. */ | |
193 | conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF); | |
194 | if (conf < 0) | |
045c1391 | 195 | dev_warn(dev, "ad7414_probe unable to read config register.\n"); |
6c633c30 SM |
196 | else { |
197 | conf &= ~(1 << 7); | |
198 | i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf); | |
199 | } | |
200 | ||
045c1391 AL |
201 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
202 | client->name, | |
203 | data, ad7414_groups); | |
204 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
6c633c30 SM |
205 | } |
206 | ||
207 | static const struct i2c_device_id ad7414_id[] = { | |
208 | { "ad7414", 0 }, | |
209 | {} | |
210 | }; | |
6407deb5 | 211 | MODULE_DEVICE_TABLE(i2c, ad7414_id); |
6c633c30 | 212 | |
07182986 | 213 | static const struct of_device_id __maybe_unused ad7414_of_match[] = { |
72edf311 JMC |
214 | { .compatible = "ad,ad7414" }, |
215 | { }, | |
216 | }; | |
217 | MODULE_DEVICE_TABLE(of, ad7414_of_match); | |
218 | ||
6c633c30 SM |
219 | static struct i2c_driver ad7414_driver = { |
220 | .driver = { | |
221 | .name = "ad7414", | |
72edf311 | 222 | .of_match_table = of_match_ptr(ad7414_of_match), |
6c633c30 | 223 | }, |
67487038 | 224 | .probe_new = ad7414_probe, |
6c633c30 SM |
225 | .id_table = ad7414_id, |
226 | }; | |
227 | ||
f0967eea | 228 | module_i2c_driver(ad7414_driver); |
6c633c30 SM |
229 | |
230 | MODULE_AUTHOR("Stefan Roese <sr at denx.de>, " | |
231 | "Frank Edelhaeuser <frank.edelhaeuser at spansion.com>"); | |
232 | ||
233 | MODULE_DESCRIPTION("AD7414 driver"); | |
234 | MODULE_LICENSE("GPL"); |