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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ds620.c - Support for temperature sensor and thermostat DS620
4 *
5 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
6 *
7 * based on ds1621.c by Christian W. Zuckschwerdt <zany@triq.net>
8 */
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/jiffies.h>
14#include <linux/i2c.h>
15#include <linux/hwmon.h>
16#include <linux/hwmon-sysfs.h>
17#include <linux/err.h>
18#include <linux/mutex.h>
19#include <linux/sysfs.h>
20#include <linux/platform_data/ds620.h>
21
22/*
23 * Many DS620 constants specified below
24 * 15 14 13 12 11 10 09 08
25 * |Done|NVB |THF |TLF |R1 |R0 |AUTOC|1SHOT|
26 *
27 * 07 06 05 04 03 02 01 00
28 * |PO2 |PO1 |A2 |A1 |A0 | | | |
29 */
30#define DS620_REG_CONFIG_DONE 0x8000
31#define DS620_REG_CONFIG_NVB 0x4000
32#define DS620_REG_CONFIG_THF 0x2000
33#define DS620_REG_CONFIG_TLF 0x1000
34#define DS620_REG_CONFIG_R1 0x0800
35#define DS620_REG_CONFIG_R0 0x0400
36#define DS620_REG_CONFIG_AUTOC 0x0200
37#define DS620_REG_CONFIG_1SHOT 0x0100
38#define DS620_REG_CONFIG_PO2 0x0080
39#define DS620_REG_CONFIG_PO1 0x0040
40#define DS620_REG_CONFIG_A2 0x0020
41#define DS620_REG_CONFIG_A1 0x0010
42#define DS620_REG_CONFIG_A0 0x0008
43
44/* The DS620 registers */
45static const u8 DS620_REG_TEMP[3] = {
46 0xAA, /* input, word, RO */
47 0xA2, /* min, word, RW */
48 0xA0, /* max, word, RW */
49};
50
51#define DS620_REG_CONF 0xAC /* word, RW */
52#define DS620_COM_START 0x51 /* no data */
53#define DS620_COM_STOP 0x22 /* no data */
54
55/* Each client has this additional data */
56struct ds620_data {
57 struct i2c_client *client;
58 struct mutex update_lock;
59 bool valid; /* true if following fields are valid */
60 unsigned long last_updated; /* In jiffies */
61
62 s16 temp[3]; /* Register values, word */
63};
64
65static void ds620_init_client(struct i2c_client *client)
66{
67 struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev);
68 u16 conf, new_conf;
69
70 new_conf = conf =
71 i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
72
73 /* switch to continuous conversion mode */
74 new_conf &= ~DS620_REG_CONFIG_1SHOT;
75 /* already high at power-on, but don't trust the BIOS! */
76 new_conf |= DS620_REG_CONFIG_PO2;
77 /* thermostat mode according to platform data */
78 if (ds620_info && ds620_info->pomode == 1)
79 new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */
80 else if (ds620_info && ds620_info->pomode == 2)
81 new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */
82 else
83 new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */
84 /* with highest precision */
85 new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0;
86
87 if (conf != new_conf)
88 i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf);
89
90 /* start conversion */
91 i2c_smbus_write_byte(client, DS620_COM_START);
92}
93
94static struct ds620_data *ds620_update_client(struct device *dev)
95{
96 struct ds620_data *data = dev_get_drvdata(dev);
97 struct i2c_client *client = data->client;
98 struct ds620_data *ret = data;
99
100 mutex_lock(&data->update_lock);
101
102 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
103 || !data->valid) {
104 int i;
105 int res;
106
107 dev_dbg(&client->dev, "Starting ds620 update\n");
108
109 for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
110 res = i2c_smbus_read_word_swapped(client,
111 DS620_REG_TEMP[i]);
112 if (res < 0) {
113 ret = ERR_PTR(res);
114 goto abort;
115 }
116
117 data->temp[i] = res;
118 }
119
120 data->last_updated = jiffies;
121 data->valid = true;
122 }
123abort:
124 mutex_unlock(&data->update_lock);
125
126 return ret;
127}
128
129static ssize_t temp_show(struct device *dev, struct device_attribute *da,
130 char *buf)
131{
132 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
133 struct ds620_data *data = ds620_update_client(dev);
134
135 if (IS_ERR(data))
136 return PTR_ERR(data);
137
138 return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10);
139}
140
141static ssize_t temp_store(struct device *dev, struct device_attribute *da,
142 const char *buf, size_t count)
143{
144 int res;
145 long val;
146
147 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
148 struct ds620_data *data = dev_get_drvdata(dev);
149 struct i2c_client *client = data->client;
150
151 res = kstrtol(buf, 10, &val);
152
153 if (res)
154 return res;
155
156 val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8;
157
158 mutex_lock(&data->update_lock);
159 data->temp[attr->index] = val;
160 i2c_smbus_write_word_swapped(client, DS620_REG_TEMP[attr->index],
161 data->temp[attr->index]);
162 mutex_unlock(&data->update_lock);
163 return count;
164}
165
166static ssize_t alarm_show(struct device *dev, struct device_attribute *da,
167 char *buf)
168{
169 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
170 struct ds620_data *data = ds620_update_client(dev);
171 struct i2c_client *client;
172 u16 conf, new_conf;
173 int res;
174
175 if (IS_ERR(data))
176 return PTR_ERR(data);
177
178 client = data->client;
179
180 /* reset alarms if necessary */
181 res = i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
182 if (res < 0)
183 return res;
184
185 new_conf = conf = res;
186 new_conf &= ~attr->index;
187 if (conf != new_conf) {
188 res = i2c_smbus_write_word_swapped(client, DS620_REG_CONF,
189 new_conf);
190 if (res < 0)
191 return res;
192 }
193
194 return sprintf(buf, "%d\n", !!(conf & attr->index));
195}
196
197static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
198static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 1);
199static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2);
200static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, DS620_REG_CONFIG_TLF);
201static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, DS620_REG_CONFIG_THF);
202
203static struct attribute *ds620_attrs[] = {
204 &sensor_dev_attr_temp1_input.dev_attr.attr,
205 &sensor_dev_attr_temp1_min.dev_attr.attr,
206 &sensor_dev_attr_temp1_max.dev_attr.attr,
207 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
208 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
209 NULL
210};
211
212ATTRIBUTE_GROUPS(ds620);
213
214static int ds620_probe(struct i2c_client *client)
215{
216 struct device *dev = &client->dev;
217 struct device *hwmon_dev;
218 struct ds620_data *data;
219
220 data = devm_kzalloc(dev, sizeof(struct ds620_data), GFP_KERNEL);
221 if (!data)
222 return -ENOMEM;
223
224 data->client = client;
225 mutex_init(&data->update_lock);
226
227 /* Initialize the DS620 chip */
228 ds620_init_client(client);
229
230 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
231 data, ds620_groups);
232 return PTR_ERR_OR_ZERO(hwmon_dev);
233}
234
235static const struct i2c_device_id ds620_id[] = {
236 {"ds620", 0},
237 {}
238};
239
240MODULE_DEVICE_TABLE(i2c, ds620_id);
241
242/* This is the driver that will be inserted */
243static struct i2c_driver ds620_driver = {
244 .class = I2C_CLASS_HWMON,
245 .driver = {
246 .name = "ds620",
247 },
248 .probe = ds620_probe,
249 .id_table = ds620_id,
250};
251
252module_i2c_driver(ds620_driver);
253
254MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
255MODULE_DESCRIPTION("DS620 driver");
256MODULE_LICENSE("GPL");
1/*
2 * ds620.c - Support for temperature sensor and thermostat DS620
3 *
4 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
5 *
6 * based on ds1621.c by Christian W. Zuckschwerdt <zany@triq.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/jiffies.h>
27#include <linux/i2c.h>
28#include <linux/hwmon.h>
29#include <linux/hwmon-sysfs.h>
30#include <linux/err.h>
31#include <linux/mutex.h>
32#include <linux/sysfs.h>
33#include <linux/platform_data/ds620.h>
34
35/*
36 * Many DS620 constants specified below
37 * 15 14 13 12 11 10 09 08
38 * |Done|NVB |THF |TLF |R1 |R0 |AUTOC|1SHOT|
39 *
40 * 07 06 05 04 03 02 01 00
41 * |PO2 |PO1 |A2 |A1 |A0 | | | |
42 */
43#define DS620_REG_CONFIG_DONE 0x8000
44#define DS620_REG_CONFIG_NVB 0x4000
45#define DS620_REG_CONFIG_THF 0x2000
46#define DS620_REG_CONFIG_TLF 0x1000
47#define DS620_REG_CONFIG_R1 0x0800
48#define DS620_REG_CONFIG_R0 0x0400
49#define DS620_REG_CONFIG_AUTOC 0x0200
50#define DS620_REG_CONFIG_1SHOT 0x0100
51#define DS620_REG_CONFIG_PO2 0x0080
52#define DS620_REG_CONFIG_PO1 0x0040
53#define DS620_REG_CONFIG_A2 0x0020
54#define DS620_REG_CONFIG_A1 0x0010
55#define DS620_REG_CONFIG_A0 0x0008
56
57/* The DS620 registers */
58static const u8 DS620_REG_TEMP[3] = {
59 0xAA, /* input, word, RO */
60 0xA2, /* min, word, RW */
61 0xA0, /* max, word, RW */
62};
63
64#define DS620_REG_CONF 0xAC /* word, RW */
65#define DS620_COM_START 0x51 /* no data */
66#define DS620_COM_STOP 0x22 /* no data */
67
68/* Each client has this additional data */
69struct ds620_data {
70 struct i2c_client *client;
71 struct mutex update_lock;
72 char valid; /* !=0 if following fields are valid */
73 unsigned long last_updated; /* In jiffies */
74
75 s16 temp[3]; /* Register values, word */
76};
77
78static void ds620_init_client(struct i2c_client *client)
79{
80 struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev);
81 u16 conf, new_conf;
82
83 new_conf = conf =
84 i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
85
86 /* switch to continuous conversion mode */
87 new_conf &= ~DS620_REG_CONFIG_1SHOT;
88 /* already high at power-on, but don't trust the BIOS! */
89 new_conf |= DS620_REG_CONFIG_PO2;
90 /* thermostat mode according to platform data */
91 if (ds620_info && ds620_info->pomode == 1)
92 new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */
93 else if (ds620_info && ds620_info->pomode == 2)
94 new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */
95 else
96 new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */
97 /* with highest precision */
98 new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0;
99
100 if (conf != new_conf)
101 i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf);
102
103 /* start conversion */
104 i2c_smbus_write_byte(client, DS620_COM_START);
105}
106
107static struct ds620_data *ds620_update_client(struct device *dev)
108{
109 struct ds620_data *data = dev_get_drvdata(dev);
110 struct i2c_client *client = data->client;
111 struct ds620_data *ret = data;
112
113 mutex_lock(&data->update_lock);
114
115 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
116 || !data->valid) {
117 int i;
118 int res;
119
120 dev_dbg(&client->dev, "Starting ds620 update\n");
121
122 for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
123 res = i2c_smbus_read_word_swapped(client,
124 DS620_REG_TEMP[i]);
125 if (res < 0) {
126 ret = ERR_PTR(res);
127 goto abort;
128 }
129
130 data->temp[i] = res;
131 }
132
133 data->last_updated = jiffies;
134 data->valid = 1;
135 }
136abort:
137 mutex_unlock(&data->update_lock);
138
139 return ret;
140}
141
142static ssize_t show_temp(struct device *dev, struct device_attribute *da,
143 char *buf)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
146 struct ds620_data *data = ds620_update_client(dev);
147
148 if (IS_ERR(data))
149 return PTR_ERR(data);
150
151 return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10);
152}
153
154static ssize_t set_temp(struct device *dev, struct device_attribute *da,
155 const char *buf, size_t count)
156{
157 int res;
158 long val;
159
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
161 struct ds620_data *data = dev_get_drvdata(dev);
162 struct i2c_client *client = data->client;
163
164 res = kstrtol(buf, 10, &val);
165
166 if (res)
167 return res;
168
169 val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8;
170
171 mutex_lock(&data->update_lock);
172 data->temp[attr->index] = val;
173 i2c_smbus_write_word_swapped(client, DS620_REG_TEMP[attr->index],
174 data->temp[attr->index]);
175 mutex_unlock(&data->update_lock);
176 return count;
177}
178
179static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
180 char *buf)
181{
182 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
183 struct ds620_data *data = ds620_update_client(dev);
184 struct i2c_client *client;
185 u16 conf, new_conf;
186 int res;
187
188 if (IS_ERR(data))
189 return PTR_ERR(data);
190
191 client = data->client;
192
193 /* reset alarms if necessary */
194 res = i2c_smbus_read_word_swapped(client, DS620_REG_CONF);
195 if (res < 0)
196 return res;
197
198 new_conf = conf = res;
199 new_conf &= ~attr->index;
200 if (conf != new_conf) {
201 res = i2c_smbus_write_word_swapped(client, DS620_REG_CONF,
202 new_conf);
203 if (res < 0)
204 return res;
205 }
206
207 return sprintf(buf, "%d\n", !!(conf & attr->index));
208}
209
210static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
211static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1);
212static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2);
213static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
214 DS620_REG_CONFIG_TLF);
215static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
216 DS620_REG_CONFIG_THF);
217
218static struct attribute *ds620_attrs[] = {
219 &sensor_dev_attr_temp1_input.dev_attr.attr,
220 &sensor_dev_attr_temp1_min.dev_attr.attr,
221 &sensor_dev_attr_temp1_max.dev_attr.attr,
222 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
223 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
224 NULL
225};
226
227ATTRIBUTE_GROUPS(ds620);
228
229static int ds620_probe(struct i2c_client *client,
230 const struct i2c_device_id *id)
231{
232 struct device *dev = &client->dev;
233 struct device *hwmon_dev;
234 struct ds620_data *data;
235
236 data = devm_kzalloc(dev, sizeof(struct ds620_data), GFP_KERNEL);
237 if (!data)
238 return -ENOMEM;
239
240 data->client = client;
241 mutex_init(&data->update_lock);
242
243 /* Initialize the DS620 chip */
244 ds620_init_client(client);
245
246 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
247 data, ds620_groups);
248 return PTR_ERR_OR_ZERO(hwmon_dev);
249}
250
251static const struct i2c_device_id ds620_id[] = {
252 {"ds620", 0},
253 {}
254};
255
256MODULE_DEVICE_TABLE(i2c, ds620_id);
257
258/* This is the driver that will be inserted */
259static struct i2c_driver ds620_driver = {
260 .class = I2C_CLASS_HWMON,
261 .driver = {
262 .name = "ds620",
263 },
264 .probe = ds620_probe,
265 .id_table = ds620_id,
266};
267
268module_i2c_driver(ds620_driver);
269
270MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
271MODULE_DESCRIPTION("DS620 driver");
272MODULE_LICENSE("GPL");