This source file includes following definitions.
- s3c_hwmon_read_ch
- s3c_hwmon_show_raw
- s3c_hwmon_add_raw
- s3c_hwmon_remove_raw
- s3c_hwmon_add_raw
- s3c_hwmon_remove_raw
- s3c_hwmon_ch_show
- s3c_hwmon_label_show
- s3c_hwmon_create_attr
- s3c_hwmon_remove_attr
- s3c_hwmon_probe
- s3c_hwmon_remove
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11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/io.h>
14 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/clk.h>
17 #include <linux/interrupt.h>
18 #include <linux/platform_device.h>
19
20 #include <linux/hwmon.h>
21 #include <linux/hwmon-sysfs.h>
22
23 #include <plat/adc.h>
24 #include <linux/platform_data/hwmon-s3c.h>
25
26 struct s3c_hwmon_attr {
27 struct sensor_device_attribute in;
28 struct sensor_device_attribute label;
29 char in_name[12];
30 char label_name[12];
31 };
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39
40 struct s3c_hwmon {
41 struct mutex lock;
42 struct s3c_adc_client *client;
43 struct device *hwmon_dev;
44
45 struct s3c_hwmon_attr attrs[8];
46 };
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57
58 static int s3c_hwmon_read_ch(struct device *dev,
59 struct s3c_hwmon *hwmon, int channel)
60 {
61 int ret;
62
63 ret = mutex_lock_interruptible(&hwmon->lock);
64 if (ret < 0)
65 return ret;
66
67 dev_dbg(dev, "reading channel %d\n", channel);
68
69 ret = s3c_adc_read(hwmon->client, channel);
70 mutex_unlock(&hwmon->lock);
71
72 return ret;
73 }
74
75 #ifdef CONFIG_SENSORS_S3C_RAW
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85
86 static ssize_t s3c_hwmon_show_raw(struct device *dev,
87 struct device_attribute *attr, char *buf)
88 {
89 struct s3c_hwmon *adc = dev_get_drvdata(dev);
90 struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
91 int ret;
92
93 ret = s3c_hwmon_read_ch(dev, adc, sa->index);
94
95 return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
96 }
97
98 static SENSOR_DEVICE_ATTR(adc0_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 0);
99 static SENSOR_DEVICE_ATTR(adc1_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 1);
100 static SENSOR_DEVICE_ATTR(adc2_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 2);
101 static SENSOR_DEVICE_ATTR(adc3_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 3);
102 static SENSOR_DEVICE_ATTR(adc4_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 4);
103 static SENSOR_DEVICE_ATTR(adc5_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 5);
104 static SENSOR_DEVICE_ATTR(adc6_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 6);
105 static SENSOR_DEVICE_ATTR(adc7_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 7);
106
107 static struct attribute *s3c_hwmon_attrs[9] = {
108 &sensor_dev_attr_adc0_raw.dev_attr.attr,
109 &sensor_dev_attr_adc1_raw.dev_attr.attr,
110 &sensor_dev_attr_adc2_raw.dev_attr.attr,
111 &sensor_dev_attr_adc3_raw.dev_attr.attr,
112 &sensor_dev_attr_adc4_raw.dev_attr.attr,
113 &sensor_dev_attr_adc5_raw.dev_attr.attr,
114 &sensor_dev_attr_adc6_raw.dev_attr.attr,
115 &sensor_dev_attr_adc7_raw.dev_attr.attr,
116 NULL,
117 };
118
119 static struct attribute_group s3c_hwmon_attrgroup = {
120 .attrs = s3c_hwmon_attrs,
121 };
122
123 static inline int s3c_hwmon_add_raw(struct device *dev)
124 {
125 return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
126 }
127
128 static inline void s3c_hwmon_remove_raw(struct device *dev)
129 {
130 sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
131 }
132
133 #else
134
135 static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
136 static inline void s3c_hwmon_remove_raw(struct device *dev) { }
137
138 #endif
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149
150 static ssize_t s3c_hwmon_ch_show(struct device *dev,
151 struct device_attribute *attr,
152 char *buf)
153 {
154 struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
155 struct s3c_hwmon *hwmon = dev_get_drvdata(dev);
156 struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
157 struct s3c_hwmon_chcfg *cfg;
158 int ret;
159
160 cfg = pdata->in[sen_attr->index];
161
162 ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
163 if (ret < 0)
164 return ret;
165
166 ret *= cfg->mult;
167 ret = DIV_ROUND_CLOSEST(ret, cfg->div);
168
169 return snprintf(buf, PAGE_SIZE, "%d\n", ret);
170 }
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179
180 static ssize_t s3c_hwmon_label_show(struct device *dev,
181 struct device_attribute *attr,
182 char *buf)
183 {
184 struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
185 struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev);
186 struct s3c_hwmon_chcfg *cfg;
187
188 cfg = pdata->in[sen_attr->index];
189
190 return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
191 }
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206
207 static int s3c_hwmon_create_attr(struct device *dev,
208 struct s3c_hwmon_chcfg *cfg,
209 struct s3c_hwmon_attr *attrs,
210 int channel)
211 {
212 struct sensor_device_attribute *attr;
213 int ret;
214
215 snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);
216
217 attr = &attrs->in;
218 attr->index = channel;
219 sysfs_attr_init(&attr->dev_attr.attr);
220 attr->dev_attr.attr.name = attrs->in_name;
221 attr->dev_attr.attr.mode = S_IRUGO;
222 attr->dev_attr.show = s3c_hwmon_ch_show;
223
224 ret = device_create_file(dev, &attr->dev_attr);
225 if (ret < 0) {
226 dev_err(dev, "failed to create input attribute\n");
227 return ret;
228 }
229
230
231 if (cfg->name) {
232 snprintf(attrs->label_name, sizeof(attrs->label_name),
233 "in%d_label", channel);
234
235 attr = &attrs->label;
236 attr->index = channel;
237 sysfs_attr_init(&attr->dev_attr.attr);
238 attr->dev_attr.attr.name = attrs->label_name;
239 attr->dev_attr.attr.mode = S_IRUGO;
240 attr->dev_attr.show = s3c_hwmon_label_show;
241
242 ret = device_create_file(dev, &attr->dev_attr);
243 if (ret < 0) {
244 device_remove_file(dev, &attrs->in.dev_attr);
245 dev_err(dev, "failed to create label attribute\n");
246 }
247 }
248
249 return ret;
250 }
251
252 static void s3c_hwmon_remove_attr(struct device *dev,
253 struct s3c_hwmon_attr *attrs)
254 {
255 device_remove_file(dev, &attrs->in.dev_attr);
256 device_remove_file(dev, &attrs->label.dev_attr);
257 }
258
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262
263 static int s3c_hwmon_probe(struct platform_device *dev)
264 {
265 struct s3c_hwmon_pdata *pdata = dev_get_platdata(&dev->dev);
266 struct s3c_hwmon *hwmon;
267 int ret = 0;
268 int i;
269
270 if (!pdata) {
271 dev_err(&dev->dev, "no platform data supplied\n");
272 return -EINVAL;
273 }
274
275 hwmon = devm_kzalloc(&dev->dev, sizeof(struct s3c_hwmon), GFP_KERNEL);
276 if (hwmon == NULL)
277 return -ENOMEM;
278
279 platform_set_drvdata(dev, hwmon);
280
281 mutex_init(&hwmon->lock);
282
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284
285 hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
286 if (IS_ERR(hwmon->client)) {
287 dev_err(&dev->dev, "cannot register adc\n");
288 return PTR_ERR(hwmon->client);
289 }
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293 ret = s3c_hwmon_add_raw(&dev->dev);
294 if (ret)
295 goto err_registered;
296
297
298
299 hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
300 if (IS_ERR(hwmon->hwmon_dev)) {
301 dev_err(&dev->dev, "error registering with hwmon\n");
302 ret = PTR_ERR(hwmon->hwmon_dev);
303 goto err_raw_attribute;
304 }
305
306 for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
307 struct s3c_hwmon_chcfg *cfg = pdata->in[i];
308
309 if (!cfg)
310 continue;
311
312 if (cfg->mult >= 0x10000)
313 dev_warn(&dev->dev,
314 "channel %d multiplier too large\n",
315 i);
316
317 if (cfg->div == 0) {
318 dev_err(&dev->dev, "channel %d divider zero\n", i);
319 continue;
320 }
321
322 ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
323 &hwmon->attrs[i], i);
324 if (ret) {
325 dev_err(&dev->dev,
326 "error creating channel %d\n", i);
327
328 for (i--; i >= 0; i--)
329 s3c_hwmon_remove_attr(&dev->dev,
330 &hwmon->attrs[i]);
331
332 goto err_hwmon_register;
333 }
334 }
335
336 return 0;
337
338 err_hwmon_register:
339 hwmon_device_unregister(hwmon->hwmon_dev);
340
341 err_raw_attribute:
342 s3c_hwmon_remove_raw(&dev->dev);
343
344 err_registered:
345 s3c_adc_release(hwmon->client);
346
347 return ret;
348 }
349
350 static int s3c_hwmon_remove(struct platform_device *dev)
351 {
352 struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
353 int i;
354
355 s3c_hwmon_remove_raw(&dev->dev);
356
357 for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
358 s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);
359
360 hwmon_device_unregister(hwmon->hwmon_dev);
361 s3c_adc_release(hwmon->client);
362
363 return 0;
364 }
365
366 static struct platform_driver s3c_hwmon_driver = {
367 .driver = {
368 .name = "s3c-hwmon",
369 },
370 .probe = s3c_hwmon_probe,
371 .remove = s3c_hwmon_remove,
372 };
373
374 module_platform_driver(s3c_hwmon_driver);
375
376 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
377 MODULE_DESCRIPTION("S3C ADC HWMon driver");
378 MODULE_LICENSE("GPL v2");
379 MODULE_ALIAS("platform:s3c-hwmon");