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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * max1619.c - Part of lm_sensors, Linux kernel modules for hardware | |
4 | * monitoring | |
9292f055 | 5 | * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net> |
7c81c60f | 6 | * Jean Delvare <jdelvare@suse.de> |
1da177e4 LT |
7 | * |
8 | * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. | |
9 | * It reports up to two temperatures (its own plus up to | |
10 | * one external one). Complete datasheet can be | |
11 | * obtained from Maxim's website at: | |
12 | * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf | |
1da177e4 LT |
13 | */ |
14 | ||
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/i2c.h> | |
943b0830 | 20 | #include <linux/hwmon.h> |
71062ffc | 21 | #include <linux/hwmon-sysfs.h> |
943b0830 | 22 | #include <linux/err.h> |
9a61bf63 | 23 | #include <linux/mutex.h> |
a5ebe668 | 24 | #include <linux/sysfs.h> |
1da177e4 | 25 | |
25e9c86d MH |
26 | static const unsigned short normal_i2c[] = { |
27 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 | 28 | |
1da177e4 LT |
29 | /* |
30 | * The MAX1619 registers | |
31 | */ | |
32 | ||
33 | #define MAX1619_REG_R_MAN_ID 0xFE | |
34 | #define MAX1619_REG_R_CHIP_ID 0xFF | |
35 | #define MAX1619_REG_R_CONFIG 0x03 | |
36 | #define MAX1619_REG_W_CONFIG 0x09 | |
37 | #define MAX1619_REG_R_CONVRATE 0x04 | |
38 | #define MAX1619_REG_W_CONVRATE 0x0A | |
39 | #define MAX1619_REG_R_STATUS 0x02 | |
40 | #define MAX1619_REG_R_LOCAL_TEMP 0x00 | |
41 | #define MAX1619_REG_R_REMOTE_TEMP 0x01 | |
42 | #define MAX1619_REG_R_REMOTE_HIGH 0x07 | |
43 | #define MAX1619_REG_W_REMOTE_HIGH 0x0D | |
44 | #define MAX1619_REG_R_REMOTE_LOW 0x08 | |
45 | #define MAX1619_REG_W_REMOTE_LOW 0x0E | |
46 | #define MAX1619_REG_R_REMOTE_CRIT 0x10 | |
47 | #define MAX1619_REG_W_REMOTE_CRIT 0x12 | |
48 | #define MAX1619_REG_R_TCRIT_HYST 0x11 | |
49 | #define MAX1619_REG_W_TCRIT_HYST 0x13 | |
50 | ||
51 | /* | |
a80e8ee6 | 52 | * Conversions |
1da177e4 LT |
53 | */ |
54 | ||
a80e8ee6 AM |
55 | static int temp_from_reg(int val) |
56 | { | |
57 | return (val & 0x80 ? val-0x100 : val) * 1000; | |
58 | } | |
59 | ||
60 | static int temp_to_reg(int val) | |
61 | { | |
62 | return (val < 0 ? val+0x100*1000 : val) / 1000; | |
63 | } | |
1da177e4 | 64 | |
f8311196 GR |
65 | enum temp_index { |
66 | t_input1 = 0, | |
67 | t_input2, | |
68 | t_low2, | |
69 | t_high2, | |
70 | t_crit2, | |
71 | t_hyst2, | |
72 | t_num_regs | |
73 | }; | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * Client data (each client gets its own) | |
77 | */ | |
78 | ||
79 | struct max1619_data { | |
9f1513bd | 80 | struct i2c_client *client; |
9a61bf63 | 81 | struct mutex update_lock; |
952a11ca | 82 | bool valid; /* false until following fields are valid */ |
1da177e4 LT |
83 | unsigned long last_updated; /* in jiffies */ |
84 | ||
85 | /* registers values */ | |
f8311196 | 86 | u8 temp[t_num_regs]; /* index with enum temp_index */ |
8958dfb7 | 87 | u8 alarms; |
1da177e4 LT |
88 | }; |
89 | ||
f8311196 GR |
90 | static const u8 regs_read[t_num_regs] = { |
91 | [t_input1] = MAX1619_REG_R_LOCAL_TEMP, | |
92 | [t_input2] = MAX1619_REG_R_REMOTE_TEMP, | |
93 | [t_low2] = MAX1619_REG_R_REMOTE_LOW, | |
94 | [t_high2] = MAX1619_REG_R_REMOTE_HIGH, | |
95 | [t_crit2] = MAX1619_REG_R_REMOTE_CRIT, | |
96 | [t_hyst2] = MAX1619_REG_R_TCRIT_HYST, | |
97 | }; | |
98 | ||
99 | static const u8 regs_write[t_num_regs] = { | |
100 | [t_low2] = MAX1619_REG_W_REMOTE_LOW, | |
101 | [t_high2] = MAX1619_REG_W_REMOTE_HIGH, | |
102 | [t_crit2] = MAX1619_REG_W_REMOTE_CRIT, | |
103 | [t_hyst2] = MAX1619_REG_W_TCRIT_HYST, | |
104 | }; | |
105 | ||
40089a9f GR |
106 | static struct max1619_data *max1619_update_device(struct device *dev) |
107 | { | |
9f1513bd GR |
108 | struct max1619_data *data = dev_get_drvdata(dev); |
109 | struct i2c_client *client = data->client; | |
f8311196 | 110 | int config, i; |
40089a9f GR |
111 | |
112 | mutex_lock(&data->update_lock); | |
113 | ||
114 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
115 | dev_dbg(&client->dev, "Updating max1619 data.\n"); | |
f8311196 GR |
116 | for (i = 0; i < t_num_regs; i++) |
117 | data->temp[i] = i2c_smbus_read_byte_data(client, | |
118 | regs_read[i]); | |
40089a9f GR |
119 | data->alarms = i2c_smbus_read_byte_data(client, |
120 | MAX1619_REG_R_STATUS); | |
121 | /* If OVERT polarity is low, reverse alarm bit */ | |
122 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
123 | if (!(config & 0x20)) | |
124 | data->alarms ^= 0x02; | |
125 | ||
126 | data->last_updated = jiffies; | |
952a11ca | 127 | data->valid = true; |
40089a9f GR |
128 | } |
129 | ||
130 | mutex_unlock(&data->update_lock); | |
131 | ||
132 | return data; | |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Sysfs stuff | |
137 | */ | |
138 | ||
21887303 | 139 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
f8311196 GR |
140 | char *buf) |
141 | { | |
142 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
143 | struct max1619_data *data = max1619_update_device(dev); | |
144 | ||
145 | return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); | |
1da177e4 LT |
146 | } |
147 | ||
21887303 GR |
148 | static ssize_t temp_store(struct device *dev, |
149 | struct device_attribute *devattr, const char *buf, | |
150 | size_t count) | |
f8311196 GR |
151 | { |
152 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
9f1513bd GR |
153 | struct max1619_data *data = dev_get_drvdata(dev); |
154 | struct i2c_client *client = data->client; | |
f8311196 GR |
155 | long val; |
156 | int err = kstrtol(buf, 10, &val); | |
157 | if (err) | |
158 | return err; | |
159 | ||
160 | mutex_lock(&data->update_lock); | |
161 | data->temp[attr->index] = temp_to_reg(val); | |
162 | i2c_smbus_write_byte_data(client, regs_write[attr->index], | |
163 | data->temp[attr->index]); | |
164 | mutex_unlock(&data->update_lock); | |
165 | return count; | |
166 | } | |
1da177e4 | 167 | |
23eb359d | 168 | static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, |
8958dfb7 | 169 | char *buf) |
1da177e4 LT |
170 | { |
171 | struct max1619_data *data = max1619_update_device(dev); | |
172 | return sprintf(buf, "%d\n", data->alarms); | |
173 | } | |
174 | ||
21887303 | 175 | static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, |
71062ffc JD |
176 | char *buf) |
177 | { | |
178 | int bitnr = to_sensor_dev_attr(attr)->index; | |
179 | struct max1619_data *data = max1619_update_device(dev); | |
180 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
181 | } | |
182 | ||
21887303 GR |
183 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1); |
184 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2); | |
185 | static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2); | |
186 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2); | |
187 | static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2); | |
188 | static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2); | |
f8311196 | 189 | |
23eb359d | 190 | static DEVICE_ATTR_RO(alarms); |
21887303 GR |
191 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1); |
192 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2); | |
193 | static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3); | |
194 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4); | |
1da177e4 | 195 | |
9f1513bd | 196 | static struct attribute *max1619_attrs[] = { |
f8311196 GR |
197 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
198 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
199 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
200 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
201 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
202 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
a5ebe668 JD |
203 | |
204 | &dev_attr_alarms.attr, | |
71062ffc JD |
205 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
206 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
207 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
208 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
a5ebe668 JD |
209 | NULL |
210 | }; | |
9f1513bd | 211 | ATTRIBUTE_GROUPS(max1619); |
a5ebe668 | 212 | |
c6d3f6fa | 213 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 214 | static int max1619_detect(struct i2c_client *client, |
c6d3f6fa | 215 | struct i2c_board_info *info) |
1da177e4 | 216 | { |
52df6440 JD |
217 | struct i2c_adapter *adapter = client->adapter; |
218 | u8 reg_config, reg_convrate, reg_status, man_id, chip_id; | |
b0020e3f | 219 | |
1da177e4 | 220 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
c6d3f6fa | 221 | return -ENODEV; |
1da177e4 | 222 | |
52df6440 JD |
223 | /* detection */ |
224 | reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
225 | reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); | |
226 | reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); | |
227 | if ((reg_config & 0x03) != 0x00 | |
228 | || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { | |
229 | dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", | |
230 | client->addr); | |
231 | return -ENODEV; | |
1da177e4 LT |
232 | } |
233 | ||
52df6440 JD |
234 | /* identification */ |
235 | man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); | |
236 | chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); | |
237 | if (man_id != 0x4D || chip_id != 0x04) { | |
238 | dev_info(&adapter->dev, | |
239 | "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", | |
240 | man_id, chip_id); | |
241 | return -ENODEV; | |
b0020e3f | 242 | } |
1da177e4 | 243 | |
f2f394db | 244 | strscpy(info->type, "max1619", I2C_NAME_SIZE); |
c6d3f6fa JD |
245 | |
246 | return 0; | |
247 | } | |
248 | ||
40089a9f GR |
249 | static void max1619_init_client(struct i2c_client *client) |
250 | { | |
251 | u8 config; | |
252 | ||
253 | /* | |
254 | * Start the conversions. | |
255 | */ | |
256 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, | |
257 | 5); /* 2 Hz */ | |
258 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
259 | if (config & 0x40) | |
260 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, | |
261 | config & 0xBF); /* run */ | |
262 | } | |
263 | ||
67487038 | 264 | static int max1619_probe(struct i2c_client *new_client) |
c6d3f6fa JD |
265 | { |
266 | struct max1619_data *data; | |
9f1513bd | 267 | struct device *hwmon_dev; |
c6d3f6fa | 268 | |
215690a4 GR |
269 | data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data), |
270 | GFP_KERNEL); | |
271 | if (!data) | |
272 | return -ENOMEM; | |
1da177e4 | 273 | |
9f1513bd | 274 | data->client = new_client; |
9a61bf63 | 275 | mutex_init(&data->update_lock); |
1da177e4 | 276 | |
1da177e4 LT |
277 | /* Initialize the MAX1619 chip */ |
278 | max1619_init_client(new_client); | |
279 | ||
9f1513bd GR |
280 | hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev, |
281 | new_client->name, | |
282 | data, | |
283 | max1619_groups); | |
284 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
1da177e4 LT |
285 | } |
286 | ||
40089a9f GR |
287 | static const struct i2c_device_id max1619_id[] = { |
288 | { "max1619", 0 }, | |
289 | { } | |
290 | }; | |
291 | MODULE_DEVICE_TABLE(i2c, max1619_id); | |
1da177e4 | 292 | |
fd53f621 AT |
293 | #ifdef CONFIG_OF |
294 | static const struct of_device_id max1619_of_match[] = { | |
295 | { .compatible = "maxim,max1619", }, | |
296 | {}, | |
297 | }; | |
298 | ||
299 | MODULE_DEVICE_TABLE(of, max1619_of_match); | |
300 | #endif | |
301 | ||
40089a9f GR |
302 | static struct i2c_driver max1619_driver = { |
303 | .class = I2C_CLASS_HWMON, | |
304 | .driver = { | |
305 | .name = "max1619", | |
fd53f621 | 306 | .of_match_table = of_match_ptr(max1619_of_match), |
40089a9f | 307 | }, |
67487038 | 308 | .probe_new = max1619_probe, |
40089a9f GR |
309 | .id_table = max1619_id, |
310 | .detect = max1619_detect, | |
311 | .address_list = normal_i2c, | |
312 | }; | |
1da177e4 | 313 | |
f0967eea | 314 | module_i2c_driver(max1619_driver); |
1da177e4 | 315 | |
7c81c60f | 316 | MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>"); |
1da177e4 LT |
317 | MODULE_DESCRIPTION("MAX1619 sensor driver"); |
318 | MODULE_LICENSE("GPL"); |