Merge tag 'sound-5.3-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[linux-2.6-block.git] / drivers / hwmon / lm73.c
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06776077 1// SPDX-License-Identifier: GPL-2.0-only
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2/*
3 * LM73 Sensor driver
4 * Based on LM75
5 *
6 * Copyright (C) 2007, CenoSYS (www.cenosys.com).
7 * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
8 *
9 * Guillaume Ligneul <guillaume.ligneul@gmail.com>
10 * Adrien Demarez <adrien.demarez@bolloretelecom.eu>
11 * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
2bf9233a 12 * Chris Verges <kg4ysn@gmail.com>
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13 */
14
15#include <linux/module.h>
16#include <linux/init.h>
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17#include <linux/i2c.h>
18#include <linux/hwmon.h>
19#include <linux/hwmon-sysfs.h>
20#include <linux/err.h>
21
22
23/* Addresses scanned */
24static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
25 0x4d, 0x4e, I2C_CLIENT_END };
26
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27/* LM73 registers */
28#define LM73_REG_INPUT 0x00
29#define LM73_REG_CONF 0x01
30#define LM73_REG_MAX 0x02
31#define LM73_REG_MIN 0x03
32#define LM73_REG_CTRL 0x04
33#define LM73_REG_ID 0x07
34
90f4102c 35#define LM73_ID 0x9001 /* 0x0190, byte-swapped */
4e233cbe 36#define DRVNAME "lm73"
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37#define LM73_TEMP_MIN (-256000 / 250)
38#define LM73_TEMP_MAX (255750 / 250)
4e233cbe 39
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40#define LM73_CTRL_RES_SHIFT 5
41#define LM73_CTRL_RES_MASK (BIT(5) | BIT(6))
42#define LM73_CTRL_TO_MASK BIT(7)
43
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44#define LM73_CTRL_HI_SHIFT 2
45#define LM73_CTRL_LO_SHIFT 1
46
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47static const unsigned short lm73_convrates[] = {
48 14, /* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
49 28, /* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
50 56, /* 13-bits (0.06250 C/LSB): RES1 Bit = 1, RES0 Bit = 0 */
51 112, /* 14-bits (0.03125 C/LSB): RES1 Bit = 1, RES0 Bit = 1 */
52};
53
54struct lm73_data {
3710263f 55 struct i2c_client *client;
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56 struct mutex lock;
57 u8 ctrl; /* control register value */
58};
4e233cbe 59
8c14d126 60/*-----------------------------------------------------------------------*/
4e233cbe 61
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62static ssize_t temp_store(struct device *dev, struct device_attribute *da,
63 const char *buf, size_t count)
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64{
65 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
3710263f 66 struct lm73_data *data = dev_get_drvdata(dev);
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67 long temp;
68 short value;
0602934f 69 s32 err;
4e233cbe 70
179c4fdb 71 int status = kstrtol(buf, 10, &temp);
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72 if (status < 0)
73 return status;
74
75 /* Write value */
91bba688 76 value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
3710263f 77 err = i2c_smbus_write_word_swapped(data->client, attr->index, value);
0602934f 78 return (err < 0) ? err : count;
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79}
80
0f875acc 81static ssize_t temp_show(struct device *dev, struct device_attribute *da,
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82 char *buf)
83{
84 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
3710263f 85 struct lm73_data *data = dev_get_drvdata(dev);
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86 int temp;
87
3710263f 88 s32 err = i2c_smbus_read_word_swapped(data->client, attr->index);
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89 if (err < 0)
90 return err;
91
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92 /* use integer division instead of equivalent right shift to
93 guarantee arithmetic shift and preserve the sign */
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94 temp = (((s16) err) * 250) / 32;
95 return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
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96}
97
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98static ssize_t convrate_store(struct device *dev, struct device_attribute *da,
99 const char *buf, size_t count)
8c14d126 100{
3710263f 101 struct lm73_data *data = dev_get_drvdata(dev);
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102 unsigned long convrate;
103 s32 err;
104 int res = 0;
105
106 err = kstrtoul(buf, 10, &convrate);
107 if (err < 0)
108 return err;
109
110 /*
111 * Convert the desired conversion rate into register bits.
112 * res is already initialized, and everything past the second-to-last
113 * value in the array is treated as belonging to the last value
114 * in the array.
115 */
116 while (res < (ARRAY_SIZE(lm73_convrates) - 1) &&
117 convrate > lm73_convrates[res])
118 res++;
119
120 mutex_lock(&data->lock);
121 data->ctrl &= LM73_CTRL_TO_MASK;
122 data->ctrl |= res << LM73_CTRL_RES_SHIFT;
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123 err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,
124 data->ctrl);
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125 mutex_unlock(&data->lock);
126
127 if (err < 0)
128 return err;
129
130 return count;
131}
132
0f875acc 133static ssize_t convrate_show(struct device *dev, struct device_attribute *da,
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134 char *buf)
135{
3710263f 136 struct lm73_data *data = dev_get_drvdata(dev);
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137 int res;
138
139 res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;
140 return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
141}
4e233cbe 142
0f875acc 143static ssize_t maxmin_alarm_show(struct device *dev,
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144 struct device_attribute *da, char *buf)
145{
2bf9233a 146 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
3710263f 147 struct lm73_data *data = dev_get_drvdata(dev);
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148 s32 ctrl;
149
150 mutex_lock(&data->lock);
3710263f 151 ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);
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152 if (ctrl < 0)
153 goto abort;
154 data->ctrl = ctrl;
155 mutex_unlock(&data->lock);
156
157 return scnprintf(buf, PAGE_SIZE, "%d\n", (ctrl >> attr->index) & 1);
158
159abort:
160 mutex_unlock(&data->lock);
161 return ctrl;
162}
163
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164/*-----------------------------------------------------------------------*/
165
166/* sysfs attributes for hwmon */
167
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168static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, LM73_REG_MAX);
169static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, LM73_REG_MIN);
170static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, LM73_REG_INPUT);
171static SENSOR_DEVICE_ATTR_RW(update_interval, convrate, 0);
172static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, maxmin_alarm,
173 LM73_CTRL_HI_SHIFT);
174static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, maxmin_alarm,
175 LM73_CTRL_LO_SHIFT);
4e233cbe 176
3710263f 177static struct attribute *lm73_attrs[] = {
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178 &sensor_dev_attr_temp1_input.dev_attr.attr,
179 &sensor_dev_attr_temp1_max.dev_attr.attr,
180 &sensor_dev_attr_temp1_min.dev_attr.attr,
8c14d126 181 &sensor_dev_attr_update_interval.dev_attr.attr,
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182 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
183 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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184 NULL
185};
3710263f 186ATTRIBUTE_GROUPS(lm73);
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187
188/*-----------------------------------------------------------------------*/
189
190/* device probe and removal */
191
192static int
193lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
194{
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195 struct device *dev = &client->dev;
196 struct device *hwmon_dev;
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197 struct lm73_data *data;
198 int ctrl;
199
3710263f 200 data = devm_kzalloc(dev, sizeof(struct lm73_data), GFP_KERNEL);
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201 if (!data)
202 return -ENOMEM;
203
3710263f 204 data->client = client;
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205 mutex_init(&data->lock);
206
207 ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
208 if (ctrl < 0)
209 return ctrl;
210 data->ctrl = ctrl;
4e233cbe 211
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212 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
213 data, lm73_groups);
214 if (IS_ERR(hwmon_dev))
215 return PTR_ERR(hwmon_dev);
4e233cbe 216
3710263f 217 dev_info(dev, "sensor '%s'\n", client->name);
4e233cbe 218
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219 return 0;
220}
221
222static const struct i2c_device_id lm73_ids[] = {
1f86df49 223 { "lm73", 0 },
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224 { /* LIST END */ }
225};
226MODULE_DEVICE_TABLE(i2c, lm73_ids);
227
228/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792 229static int lm73_detect(struct i2c_client *new_client,
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230 struct i2c_board_info *info)
231{
232 struct i2c_adapter *adapter = new_client->adapter;
24d6e2a8 233 int id, ctrl, conf;
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234
235 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
236 I2C_FUNC_SMBUS_WORD_DATA))
237 return -ENODEV;
238
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239 /*
240 * Do as much detection as possible with byte reads first, as word
241 * reads can confuse other devices.
242 */
243 ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
244 if (ctrl < 0 || (ctrl & 0x10))
245 return -ENODEV;
246
247 conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
248 if (conf < 0 || (conf & 0x0c))
249 return -ENODEV;
250
251 id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
252 if (id < 0 || id != (LM73_ID & 0xff))
253 return -ENODEV;
254
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255 /* Check device ID */
256 id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
24d6e2a8 257 if (id < 0 || id != LM73_ID)
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258 return -ENODEV;
259
260 strlcpy(info->type, "lm73", I2C_NAME_SIZE);
261
262 return 0;
263}
264
265static struct i2c_driver lm73_driver = {
266 .class = I2C_CLASS_HWMON,
267 .driver = {
268 .name = "lm73",
269 },
270 .probe = lm73_probe,
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271 .id_table = lm73_ids,
272 .detect = lm73_detect,
c3813d6a 273 .address_list = normal_i2c,
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274};
275
f0967eea 276module_i2c_driver(lm73_driver);
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277
278MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
279MODULE_DESCRIPTION("LM73 driver");
280MODULE_LICENSE("GPL");