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27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/i2c.h>
31#include <linux/hwmon.h>
32#include <linux/hwmon-sysfs.h>
33#include <linux/err.h>
34#include <linux/sysfs.h>
35#include <linux/mutex.h>
36#include <linux/jiffies.h>
37
38#define THERMAL_PID_REG 0xfd
39#define THERMAL_SMSC_ID_REG 0xfe
40#define THERMAL_REVISION_REG 0xff
41
42struct thermal_data {
43 struct device *hwmon_dev;
44 struct mutex mutex;
45
46
47
48
49 u8 cached_hyst;
50 unsigned long hyst_valid;
51};
52
53static ssize_t show_temp(struct device *dev,
54 struct device_attribute *attr, char *buf)
55{
56 struct i2c_client *client = to_i2c_client(dev);
57 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
58 int retval = i2c_smbus_read_byte_data(client, sda->index);
59
60 if (retval < 0)
61 return retval;
62 return sprintf(buf, "%d000\n", retval);
63}
64
65static ssize_t show_bit(struct device *dev,
66 struct device_attribute *attr, char *buf)
67{
68 struct i2c_client *client = to_i2c_client(dev);
69 struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
70 int retval = i2c_smbus_read_byte_data(client, sda->nr);
71
72 if (retval < 0)
73 return retval;
74 retval &= sda->index;
75 return sprintf(buf, "%d\n", retval ? 1 : 0);
76}
77
78static ssize_t store_temp(struct device *dev,
79 struct device_attribute *attr, const char *buf, size_t count)
80{
81 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
82 struct i2c_client *client = to_i2c_client(dev);
83 unsigned long val;
84 int retval;
85
86 if (kstrtoul(buf, 10, &val))
87 return -EINVAL;
88 retval = i2c_smbus_write_byte_data(client, sda->index,
89 DIV_ROUND_CLOSEST(val, 1000));
90 if (retval < 0)
91 return retval;
92 return count;
93}
94
95static ssize_t store_bit(struct device *dev,
96 struct device_attribute *attr, const char *buf, size_t count)
97{
98 struct i2c_client *client = to_i2c_client(dev);
99 struct thermal_data *data = i2c_get_clientdata(client);
100 struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
101 unsigned long val;
102 int retval;
103
104 if (kstrtoul(buf, 10, &val))
105 return -EINVAL;
106
107 mutex_lock(&data->mutex);
108 retval = i2c_smbus_read_byte_data(client, sda->nr);
109 if (retval < 0)
110 goto fail;
111
112 retval &= ~sda->index;
113 if (val)
114 retval |= sda->index;
115
116 retval = i2c_smbus_write_byte_data(client, sda->index, retval);
117 if (retval == 0)
118 retval = count;
119fail:
120 mutex_unlock(&data->mutex);
121 return retval;
122}
123
124static ssize_t show_hyst(struct device *dev,
125 struct device_attribute *attr, char *buf)
126{
127 struct i2c_client *client = to_i2c_client(dev);
128 struct thermal_data *data = i2c_get_clientdata(client);
129 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
130 int retval;
131 int hyst;
132
133 retval = i2c_smbus_read_byte_data(client, sda->index);
134 if (retval < 0)
135 return retval;
136
137 if (time_after(jiffies, data->hyst_valid)) {
138 hyst = i2c_smbus_read_byte_data(client, 0x21);
139 if (hyst < 0)
140 return retval;
141 data->cached_hyst = hyst;
142 data->hyst_valid = jiffies + HZ;
143 }
144 return sprintf(buf, "%d000\n", retval - data->cached_hyst);
145}
146
147static ssize_t store_hyst(struct device *dev,
148 struct device_attribute *attr, const char *buf, size_t count)
149{
150 struct i2c_client *client = to_i2c_client(dev);
151 struct thermal_data *data = i2c_get_clientdata(client);
152 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
153 int retval;
154 int hyst;
155 unsigned long val;
156
157 if (kstrtoul(buf, 10, &val))
158 return -EINVAL;
159
160 mutex_lock(&data->mutex);
161 retval = i2c_smbus_read_byte_data(client, sda->index);
162 if (retval < 0)
163 goto fail;
164
165 hyst = val - retval * 1000;
166 hyst = DIV_ROUND_CLOSEST(hyst, 1000);
167 if (hyst < 0 || hyst > 255) {
168 retval = -ERANGE;
169 goto fail;
170 }
171
172 retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
173 if (retval == 0) {
174 retval = count;
175 data->cached_hyst = hyst;
176 data->hyst_valid = jiffies + HZ;
177 }
178fail:
179 mutex_unlock(&data->mutex);
180 return retval;
181}
182
183
184
185
186
187static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
188 show_temp, store_temp, 0x06);
189static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
190 show_temp, store_temp, 0x05);
191static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
192 show_temp, store_temp, 0x20);
193static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
194static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
195 show_bit, NULL, 0x36, 0x01);
196static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
197 show_bit, NULL, 0x35, 0x01);
198static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
199 show_bit, NULL, 0x37, 0x01);
200static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
201 show_hyst, store_hyst, 0x20);
202
203static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
204 show_temp, store_temp, 0x08);
205static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
206 show_temp, store_temp, 0x07);
207static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
208 show_temp, store_temp, 0x19);
209static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
210static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
211 show_bit, NULL, 0x36, 0x02);
212static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
213 show_bit, NULL, 0x35, 0x02);
214static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
215 show_bit, NULL, 0x37, 0x02);
216static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
217 show_hyst, store_hyst, 0x19);
218
219static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
220 show_temp, store_temp, 0x16);
221static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
222 show_temp, store_temp, 0x15);
223static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
224 show_temp, store_temp, 0x1A);
225static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
226static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
227 show_bit, NULL, 0x36, 0x04);
228static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
229 show_bit, NULL, 0x35, 0x04);
230static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
231 show_bit, NULL, 0x37, 0x04);
232static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
233 show_hyst, store_hyst, 0x1A);
234
235static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
236 show_bit, store_bit, 0x03, 0x40);
237
238static struct attribute *mid_att_thermal[] = {
239 &sensor_dev_attr_temp1_min.dev_attr.attr,
240 &sensor_dev_attr_temp1_max.dev_attr.attr,
241 &sensor_dev_attr_temp1_crit.dev_attr.attr,
242 &sensor_dev_attr_temp1_input.dev_attr.attr,
243 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
244 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
245 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
246 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
247 &sensor_dev_attr_temp2_min.dev_attr.attr,
248 &sensor_dev_attr_temp2_max.dev_attr.attr,
249 &sensor_dev_attr_temp2_crit.dev_attr.attr,
250 &sensor_dev_attr_temp2_input.dev_attr.attr,
251 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
252 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
253 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
254 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
255 &sensor_dev_attr_temp3_min.dev_attr.attr,
256 &sensor_dev_attr_temp3_max.dev_attr.attr,
257 &sensor_dev_attr_temp3_crit.dev_attr.attr,
258 &sensor_dev_attr_temp3_input.dev_attr.attr,
259 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
260 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
261 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
262 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
263 &sensor_dev_attr_power_state.dev_attr.attr,
264 NULL
265};
266
267static const struct attribute_group m_thermal_gr = {
268 .attrs = mid_att_thermal
269};
270
271static int emc1403_detect(struct i2c_client *client,
272 struct i2c_board_info *info)
273{
274 int id;
275
276
277 id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
278 if (id != 0x5d)
279 return -ENODEV;
280
281 id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
282 switch (id) {
283 case 0x21:
284 strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
285 break;
286 case 0x23:
287 strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
288 break;
289
290
291
292
293 default:
294 return -ENODEV;
295 }
296
297 id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
298 if (id != 0x01)
299 return -ENODEV;
300
301 return 0;
302}
303
304static int emc1403_probe(struct i2c_client *client,
305 const struct i2c_device_id *id)
306{
307 int res;
308 struct thermal_data *data;
309
310 data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
311 GFP_KERNEL);
312 if (data == NULL)
313 return -ENOMEM;
314
315 i2c_set_clientdata(client, data);
316 mutex_init(&data->mutex);
317 data->hyst_valid = jiffies - 1;
318
319 res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
320 if (res) {
321 dev_warn(&client->dev, "create group failed\n");
322 return res;
323 }
324 data->hwmon_dev = hwmon_device_register(&client->dev);
325 if (IS_ERR(data->hwmon_dev)) {
326 res = PTR_ERR(data->hwmon_dev);
327 dev_warn(&client->dev, "register hwmon dev failed\n");
328 goto thermal_error;
329 }
330 dev_info(&client->dev, "EMC1403 Thermal chip found\n");
331 return 0;
332
333thermal_error:
334 sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
335 return res;
336}
337
338static int emc1403_remove(struct i2c_client *client)
339{
340 struct thermal_data *data = i2c_get_clientdata(client);
341
342 hwmon_device_unregister(data->hwmon_dev);
343 sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
344 return 0;
345}
346
347static const unsigned short emc1403_address_list[] = {
348 0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
349};
350
351static const struct i2c_device_id emc1403_idtable[] = {
352 { "emc1403", 0 },
353 { "emc1423", 0 },
354 { }
355};
356MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
357
358static struct i2c_driver sensor_emc1403 = {
359 .class = I2C_CLASS_HWMON,
360 .driver = {
361 .name = "emc1403",
362 },
363 .detect = emc1403_detect,
364 .probe = emc1403_probe,
365 .remove = emc1403_remove,
366 .id_table = emc1403_idtable,
367 .address_list = emc1403_address_list,
368};
369
370module_i2c_driver(sensor_emc1403);
371
372MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
373MODULE_DESCRIPTION("emc1403 Thermal Driver");
374MODULE_LICENSE("GPL v2");
375
