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24c1aa85 NG |
1 | /* |
2 | * IBM PowerNV platform sensors for temperature/fan/voltage/power | |
3 | * Copyright (C) 2014 IBM | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. | |
17 | */ | |
18 | ||
19 | #define DRVNAME "ibmpowernv" | |
20 | #define pr_fmt(fmt) DRVNAME ": " fmt | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | #include <linux/of.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include <linux/platform_device.h> | |
31 | #include <asm/opal.h> | |
32 | #include <linux/err.h> | |
33 | ||
34 | #define MAX_ATTR_LEN 32 | |
35 | ||
36 | /* Sensor suffix name from DT */ | |
37 | #define DT_FAULT_ATTR_SUFFIX "faulted" | |
38 | #define DT_DATA_ATTR_SUFFIX "data" | |
39 | #define DT_THRESHOLD_ATTR_SUFFIX "thrs" | |
40 | ||
41 | /* | |
42 | * Enumerates all the types of sensors in the POWERNV platform and does index | |
43 | * into 'struct sensor_group' | |
44 | */ | |
45 | enum sensors { | |
46 | FAN, | |
47 | AMBIENT_TEMP, | |
48 | POWER_SUPPLY, | |
49 | POWER_INPUT, | |
50 | MAX_SENSOR_TYPE, | |
51 | }; | |
52 | ||
53 | static struct sensor_group { | |
54 | const char *name; | |
55 | const char *compatible; | |
56 | struct attribute_group group; | |
57 | u32 attr_count; | |
58 | } sensor_groups[] = { | |
59 | {"fan", "ibm,opal-sensor-cooling-fan"}, | |
60 | {"temp", "ibm,opal-sensor-amb-temp"}, | |
61 | {"in", "ibm,opal-sensor-power-supply"}, | |
62 | {"power", "ibm,opal-sensor-power"} | |
63 | }; | |
64 | ||
65 | struct sensor_data { | |
66 | u32 id; /* An opaque id of the firmware for each sensor */ | |
67 | enum sensors type; | |
68 | char name[MAX_ATTR_LEN]; | |
69 | struct device_attribute dev_attr; | |
70 | }; | |
71 | ||
72 | struct platform_data { | |
73 | const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1]; | |
74 | u32 sensors_count; /* Total count of sensors from each group */ | |
75 | }; | |
76 | ||
77 | /* Platform device representing all the ibmpowernv sensors */ | |
78 | static struct platform_device *pdevice; | |
79 | ||
80 | static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr, | |
81 | char *buf) | |
82 | { | |
83 | struct sensor_data *sdata = container_of(devattr, struct sensor_data, | |
84 | dev_attr); | |
85 | ssize_t ret; | |
86 | u32 x; | |
87 | ||
88 | ret = opal_get_sensor_data(sdata->id, &x); | |
89 | if (ret) | |
90 | return ret; | |
91 | ||
92 | /* Convert temperature to milli-degrees */ | |
93 | if (sdata->type == AMBIENT_TEMP) | |
94 | x *= 1000; | |
95 | /* Convert power to micro-watts */ | |
96 | else if (sdata->type == POWER_INPUT) | |
97 | x *= 1000000; | |
98 | ||
99 | return sprintf(buf, "%u\n", x); | |
100 | } | |
101 | ||
102 | static int __init get_sensor_index_attr(const char *name, u32 *index, | |
103 | char *attr) | |
104 | { | |
105 | char *hash_pos = strchr(name, '#'); | |
106 | char buf[8] = { 0 }; | |
107 | char *dash_pos; | |
108 | u32 copy_len; | |
109 | int err; | |
110 | ||
111 | if (!hash_pos) | |
112 | return -EINVAL; | |
113 | ||
114 | dash_pos = strchr(hash_pos, '-'); | |
115 | if (!dash_pos) | |
116 | return -EINVAL; | |
117 | ||
118 | copy_len = dash_pos - hash_pos - 1; | |
119 | if (copy_len >= sizeof(buf)) | |
120 | return -EINVAL; | |
121 | ||
122 | strncpy(buf, hash_pos + 1, copy_len); | |
123 | ||
124 | err = kstrtou32(buf, 10, index); | |
125 | if (err) | |
126 | return err; | |
127 | ||
128 | strncpy(attr, dash_pos + 1, MAX_ATTR_LEN); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | /* | |
134 | * This function translates the DT node name into the 'hwmon' attribute name. | |
135 | * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc. | |
136 | * which need to be mapped as fan2_input, temp1_max respectively before | |
137 | * populating them inside hwmon device class. | |
138 | */ | |
139 | static int __init create_hwmon_attr_name(struct device *dev, enum sensors type, | |
140 | const char *node_name, | |
141 | char *hwmon_attr_name) | |
142 | { | |
143 | char attr_suffix[MAX_ATTR_LEN]; | |
144 | char *attr_name; | |
145 | u32 index; | |
146 | int err; | |
147 | ||
148 | err = get_sensor_index_attr(node_name, &index, attr_suffix); | |
149 | if (err) { | |
150 | dev_err(dev, "Sensor device node name '%s' is invalid\n", | |
151 | node_name); | |
152 | return err; | |
153 | } | |
154 | ||
155 | if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) { | |
156 | attr_name = "fault"; | |
157 | } else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) { | |
158 | attr_name = "input"; | |
159 | } else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) { | |
160 | if (type == AMBIENT_TEMP) | |
161 | attr_name = "max"; | |
162 | else if (type == FAN) | |
163 | attr_name = "min"; | |
164 | else | |
165 | return -ENOENT; | |
166 | } else { | |
167 | return -ENOENT; | |
168 | } | |
169 | ||
170 | snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s", | |
171 | sensor_groups[type].name, index, attr_name); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static int __init populate_attr_groups(struct platform_device *pdev) | |
176 | { | |
177 | struct platform_data *pdata = platform_get_drvdata(pdev); | |
178 | const struct attribute_group **pgroups = pdata->attr_groups; | |
179 | struct device_node *opal, *np; | |
180 | enum sensors type; | |
181 | ||
182 | opal = of_find_node_by_path("/ibm,opal/sensors"); | |
183 | if (!opal) { | |
aab18da4 | 184 | dev_dbg(&pdev->dev, "Opal node 'sensors' not found\n"); |
24c1aa85 NG |
185 | return -ENODEV; |
186 | } | |
187 | ||
188 | for_each_child_of_node(opal, np) { | |
189 | if (np->name == NULL) | |
190 | continue; | |
191 | ||
192 | for (type = 0; type < MAX_SENSOR_TYPE; type++) | |
193 | if (of_device_is_compatible(np, | |
194 | sensor_groups[type].compatible)) { | |
195 | sensor_groups[type].attr_count++; | |
196 | break; | |
197 | } | |
198 | } | |
199 | ||
200 | of_node_put(opal); | |
201 | ||
202 | for (type = 0; type < MAX_SENSOR_TYPE; type++) { | |
203 | sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev, | |
204 | sizeof(struct attribute *) * | |
205 | (sensor_groups[type].attr_count + 1), | |
206 | GFP_KERNEL); | |
207 | if (!sensor_groups[type].group.attrs) | |
208 | return -ENOMEM; | |
209 | ||
210 | pgroups[type] = &sensor_groups[type].group; | |
211 | pdata->sensors_count += sensor_groups[type].attr_count; | |
212 | sensor_groups[type].attr_count = 0; | |
213 | } | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Iterate through the device tree for each child of 'sensors' node, create | |
220 | * a sysfs attribute file, the file is named by translating the DT node name | |
221 | * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max | |
222 | * etc.. | |
223 | */ | |
224 | static int __init create_device_attrs(struct platform_device *pdev) | |
225 | { | |
226 | struct platform_data *pdata = platform_get_drvdata(pdev); | |
227 | const struct attribute_group **pgroups = pdata->attr_groups; | |
228 | struct device_node *opal, *np; | |
229 | struct sensor_data *sdata; | |
18d03f3c | 230 | u32 sensor_id; |
24c1aa85 NG |
231 | enum sensors type; |
232 | u32 count = 0; | |
233 | int err = 0; | |
234 | ||
235 | opal = of_find_node_by_path("/ibm,opal/sensors"); | |
236 | sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata), | |
237 | GFP_KERNEL); | |
238 | if (!sdata) { | |
239 | err = -ENOMEM; | |
240 | goto exit_put_node; | |
241 | } | |
242 | ||
243 | for_each_child_of_node(opal, np) { | |
244 | if (np->name == NULL) | |
245 | continue; | |
246 | ||
247 | for (type = 0; type < MAX_SENSOR_TYPE; type++) | |
248 | if (of_device_is_compatible(np, | |
249 | sensor_groups[type].compatible)) | |
250 | break; | |
251 | ||
252 | if (type == MAX_SENSOR_TYPE) | |
253 | continue; | |
254 | ||
18d03f3c | 255 | if (of_property_read_u32(np, "sensor-id", &sensor_id)) { |
24c1aa85 NG |
256 | dev_info(&pdev->dev, |
257 | "'sensor-id' missing in the node '%s'\n", | |
258 | np->name); | |
259 | continue; | |
260 | } | |
261 | ||
18d03f3c | 262 | sdata[count].id = sensor_id; |
24c1aa85 NG |
263 | sdata[count].type = type; |
264 | err = create_hwmon_attr_name(&pdev->dev, type, np->name, | |
265 | sdata[count].name); | |
266 | if (err) | |
267 | goto exit_put_node; | |
268 | ||
269 | sysfs_attr_init(&sdata[count].dev_attr.attr); | |
270 | sdata[count].dev_attr.attr.name = sdata[count].name; | |
271 | sdata[count].dev_attr.attr.mode = S_IRUGO; | |
272 | sdata[count].dev_attr.show = show_sensor; | |
273 | ||
274 | pgroups[type]->attrs[sensor_groups[type].attr_count++] = | |
275 | &sdata[count++].dev_attr.attr; | |
276 | } | |
277 | ||
278 | exit_put_node: | |
279 | of_node_put(opal); | |
280 | return err; | |
281 | } | |
282 | ||
283 | static int __init ibmpowernv_probe(struct platform_device *pdev) | |
284 | { | |
285 | struct platform_data *pdata; | |
286 | struct device *hwmon_dev; | |
287 | int err; | |
288 | ||
289 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
290 | if (!pdata) | |
291 | return -ENOMEM; | |
292 | ||
293 | platform_set_drvdata(pdev, pdata); | |
294 | pdata->sensors_count = 0; | |
295 | err = populate_attr_groups(pdev); | |
296 | if (err) | |
297 | return err; | |
298 | ||
299 | /* Create sysfs attribute data for each sensor found in the DT */ | |
300 | err = create_device_attrs(pdev); | |
301 | if (err) | |
302 | return err; | |
303 | ||
304 | /* Finally, register with hwmon */ | |
305 | hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME, | |
306 | pdata, | |
307 | pdata->attr_groups); | |
308 | ||
309 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
310 | } | |
311 | ||
312 | static struct platform_driver ibmpowernv_driver = { | |
313 | .driver = { | |
314 | .owner = THIS_MODULE, | |
315 | .name = DRVNAME, | |
316 | }, | |
317 | }; | |
318 | ||
319 | static int __init ibmpowernv_init(void) | |
320 | { | |
321 | int err; | |
322 | ||
323 | pdevice = platform_device_alloc(DRVNAME, 0); | |
324 | if (!pdevice) { | |
325 | pr_err("Device allocation failed\n"); | |
326 | err = -ENOMEM; | |
327 | goto exit; | |
328 | } | |
329 | ||
330 | err = platform_device_add(pdevice); | |
331 | if (err) { | |
332 | pr_err("Device addition failed (%d)\n", err); | |
333 | goto exit_device_put; | |
334 | } | |
335 | ||
336 | err = platform_driver_probe(&ibmpowernv_driver, ibmpowernv_probe); | |
337 | if (err) { | |
aab18da4 ME |
338 | if (err != -ENODEV) |
339 | pr_err("Platform driver probe failed (%d)\n", err); | |
340 | ||
24c1aa85 NG |
341 | goto exit_device_del; |
342 | } | |
343 | ||
344 | return 0; | |
345 | ||
346 | exit_device_del: | |
347 | platform_device_del(pdevice); | |
348 | exit_device_put: | |
349 | platform_device_put(pdevice); | |
350 | exit: | |
351 | return err; | |
352 | } | |
353 | ||
354 | static void __exit ibmpowernv_exit(void) | |
355 | { | |
356 | platform_driver_unregister(&ibmpowernv_driver); | |
357 | platform_device_unregister(pdevice); | |
358 | } | |
359 | ||
360 | MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>"); | |
361 | MODULE_DESCRIPTION("IBM POWERNV platform sensors"); | |
362 | MODULE_LICENSE("GPL"); | |
363 | ||
364 | module_init(ibmpowernv_init); | |
365 | module_exit(ibmpowernv_exit); |