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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
0004  *
0005  * based on max1668.c
0006  * Copyright (c) 2011 David George <david.george@ska.ac.za>
0007  */
0008 
0009 #include <linux/module.h>
0010 #include <linux/init.h>
0011 #include <linux/slab.h>
0012 #include <linux/jiffies.h>
0013 #include <linux/i2c.h>
0014 #include <linux/hwmon.h>
0015 #include <linux/hwmon-sysfs.h>
0016 #include <linux/err.h>
0017 #include <linux/mutex.h>
0018 #include <linux/of_device.h>
0019 #include <linux/of.h>
0020 
0021 #include <linux/platform_data/max6697.h>
0022 
0023 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
0024          max6697, max6698, max6699 };
0025 
0026 /* Report local sensor as temp1 */
0027 
0028 static const u8 MAX6697_REG_TEMP[] = {
0029             0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
0030 static const u8 MAX6697_REG_TEMP_EXT[] = {
0031             0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
0032 static const u8 MAX6697_REG_MAX[] = {
0033             0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
0034 static const u8 MAX6697_REG_CRIT[] = {
0035             0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
0036 
0037 /*
0038  * Map device tree / platform data register bit map to chip bit map.
0039  * Applies to alert register and over-temperature register.
0040  */
0041 #define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
0042                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
0043 #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
0044 
0045 #define MAX6697_REG_STAT(n)     (0x44 + (n))
0046 
0047 #define MAX6697_REG_CONFIG      0x41
0048 #define MAX6581_CONF_EXTENDED       (1 << 1)
0049 #define MAX6693_CONF_BETA       (1 << 2)
0050 #define MAX6697_CONF_RESISTANCE     (1 << 3)
0051 #define MAX6697_CONF_TIMEOUT        (1 << 5)
0052 #define MAX6697_REG_ALERT_MASK      0x42
0053 #define MAX6697_REG_OVERT_MASK      0x43
0054 
0055 #define MAX6581_REG_RESISTANCE      0x4a
0056 #define MAX6581_REG_IDEALITY        0x4b
0057 #define MAX6581_REG_IDEALITY_SELECT 0x4c
0058 #define MAX6581_REG_OFFSET      0x4d
0059 #define MAX6581_REG_OFFSET_SELECT   0x4e
0060 #define MAX6581_OFFSET_MIN      -31750
0061 #define MAX6581_OFFSET_MAX      31750
0062 
0063 #define MAX6697_CONV_TIME       156 /* ms per channel, worst case */
0064 
0065 struct max6697_chip_data {
0066     int channels;
0067     u32 have_ext;
0068     u32 have_crit;
0069     u32 have_fault;
0070     u8 valid_conf;
0071     const u8 *alarm_map;
0072 };
0073 
0074 struct max6697_data {
0075     struct i2c_client *client;
0076 
0077     enum chips type;
0078     const struct max6697_chip_data *chip;
0079 
0080     int update_interval;    /* in milli-seconds */
0081     int temp_offset;    /* in degrees C */
0082 
0083     struct mutex update_lock;
0084     unsigned long last_updated; /* In jiffies */
0085     bool valid;     /* true if following fields are valid */
0086 
0087     /* 1x local and up to 7x remote */
0088     u8 temp[8][4];      /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
0089 #define MAX6697_TEMP_INPUT  0
0090 #define MAX6697_TEMP_EXT    1
0091 #define MAX6697_TEMP_MAX    2
0092 #define MAX6697_TEMP_CRIT   3
0093     u32 alarms;
0094 };
0095 
0096 /* Diode fault status bits on MAX6581 are right shifted by one bit */
0097 static const u8 max6581_alarm_map[] = {
0098      0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
0099      16, 17, 18, 19, 20, 21, 22, 23 };
0100 
0101 static const struct max6697_chip_data max6697_chip_data[] = {
0102     [max6581] = {
0103         .channels = 8,
0104         .have_crit = 0xff,
0105         .have_ext = 0x7f,
0106         .have_fault = 0xfe,
0107         .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
0108         .alarm_map = max6581_alarm_map,
0109     },
0110     [max6602] = {
0111         .channels = 5,
0112         .have_crit = 0x12,
0113         .have_ext = 0x02,
0114         .have_fault = 0x1e,
0115         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0116     },
0117     [max6622] = {
0118         .channels = 5,
0119         .have_crit = 0x12,
0120         .have_ext = 0x02,
0121         .have_fault = 0x1e,
0122         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0123     },
0124     [max6636] = {
0125         .channels = 7,
0126         .have_crit = 0x72,
0127         .have_ext = 0x02,
0128         .have_fault = 0x7e,
0129         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0130     },
0131     [max6689] = {
0132         .channels = 7,
0133         .have_crit = 0x72,
0134         .have_ext = 0x02,
0135         .have_fault = 0x7e,
0136         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0137     },
0138     [max6693] = {
0139         .channels = 7,
0140         .have_crit = 0x72,
0141         .have_ext = 0x02,
0142         .have_fault = 0x7e,
0143         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
0144           MAX6697_CONF_TIMEOUT,
0145     },
0146     [max6694] = {
0147         .channels = 5,
0148         .have_crit = 0x12,
0149         .have_ext = 0x02,
0150         .have_fault = 0x1e,
0151         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
0152           MAX6697_CONF_TIMEOUT,
0153     },
0154     [max6697] = {
0155         .channels = 7,
0156         .have_crit = 0x72,
0157         .have_ext = 0x02,
0158         .have_fault = 0x7e,
0159         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0160     },
0161     [max6698] = {
0162         .channels = 7,
0163         .have_crit = 0x72,
0164         .have_ext = 0x02,
0165         .have_fault = 0x0e,
0166         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0167     },
0168     [max6699] = {
0169         .channels = 5,
0170         .have_crit = 0x12,
0171         .have_ext = 0x02,
0172         .have_fault = 0x1e,
0173         .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
0174     },
0175 };
0176 
0177 static inline int max6581_offset_to_millic(int val)
0178 {
0179     return sign_extend32(val, 7) * 250;
0180 }
0181 
0182 static struct max6697_data *max6697_update_device(struct device *dev)
0183 {
0184     struct max6697_data *data = dev_get_drvdata(dev);
0185     struct i2c_client *client = data->client;
0186     struct max6697_data *ret = data;
0187     int val;
0188     int i;
0189     u32 alarms;
0190 
0191     mutex_lock(&data->update_lock);
0192 
0193     if (data->valid &&
0194         !time_after(jiffies, data->last_updated
0195             + msecs_to_jiffies(data->update_interval)))
0196         goto abort;
0197 
0198     for (i = 0; i < data->chip->channels; i++) {
0199         if (data->chip->have_ext & (1 << i)) {
0200             val = i2c_smbus_read_byte_data(client,
0201                                MAX6697_REG_TEMP_EXT[i]);
0202             if (unlikely(val < 0)) {
0203                 ret = ERR_PTR(val);
0204                 goto abort;
0205             }
0206             data->temp[i][MAX6697_TEMP_EXT] = val;
0207         }
0208 
0209         val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
0210         if (unlikely(val < 0)) {
0211             ret = ERR_PTR(val);
0212             goto abort;
0213         }
0214         data->temp[i][MAX6697_TEMP_INPUT] = val;
0215 
0216         val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
0217         if (unlikely(val < 0)) {
0218             ret = ERR_PTR(val);
0219             goto abort;
0220         }
0221         data->temp[i][MAX6697_TEMP_MAX] = val;
0222 
0223         if (data->chip->have_crit & (1 << i)) {
0224             val = i2c_smbus_read_byte_data(client,
0225                                MAX6697_REG_CRIT[i]);
0226             if (unlikely(val < 0)) {
0227                 ret = ERR_PTR(val);
0228                 goto abort;
0229             }
0230             data->temp[i][MAX6697_TEMP_CRIT] = val;
0231         }
0232     }
0233 
0234     alarms = 0;
0235     for (i = 0; i < 3; i++) {
0236         val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
0237         if (unlikely(val < 0)) {
0238             ret = ERR_PTR(val);
0239             goto abort;
0240         }
0241         alarms = (alarms << 8) | val;
0242     }
0243     data->alarms = alarms;
0244     data->last_updated = jiffies;
0245     data->valid = true;
0246 abort:
0247     mutex_unlock(&data->update_lock);
0248 
0249     return ret;
0250 }
0251 
0252 static ssize_t temp_input_show(struct device *dev,
0253                    struct device_attribute *devattr, char *buf)
0254 {
0255     int index = to_sensor_dev_attr(devattr)->index;
0256     struct max6697_data *data = max6697_update_device(dev);
0257     int temp;
0258 
0259     if (IS_ERR(data))
0260         return PTR_ERR(data);
0261 
0262     temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
0263     temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
0264 
0265     return sprintf(buf, "%d\n", temp * 125);
0266 }
0267 
0268 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
0269              char *buf)
0270 {
0271     int nr = to_sensor_dev_attr_2(devattr)->nr;
0272     int index = to_sensor_dev_attr_2(devattr)->index;
0273     struct max6697_data *data = max6697_update_device(dev);
0274     int temp;
0275 
0276     if (IS_ERR(data))
0277         return PTR_ERR(data);
0278 
0279     temp = data->temp[nr][index];
0280     temp -= data->temp_offset;
0281 
0282     return sprintf(buf, "%d\n", temp * 1000);
0283 }
0284 
0285 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
0286               char *buf)
0287 {
0288     int index = to_sensor_dev_attr(attr)->index;
0289     struct max6697_data *data = max6697_update_device(dev);
0290 
0291     if (IS_ERR(data))
0292         return PTR_ERR(data);
0293 
0294     if (data->chip->alarm_map)
0295         index = data->chip->alarm_map[index];
0296 
0297     return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
0298 }
0299 
0300 static ssize_t temp_store(struct device *dev,
0301               struct device_attribute *devattr, const char *buf,
0302               size_t count)
0303 {
0304     int nr = to_sensor_dev_attr_2(devattr)->nr;
0305     int index = to_sensor_dev_attr_2(devattr)->index;
0306     struct max6697_data *data = dev_get_drvdata(dev);
0307     long temp;
0308     int ret;
0309 
0310     ret = kstrtol(buf, 10, &temp);
0311     if (ret < 0)
0312         return ret;
0313 
0314     mutex_lock(&data->update_lock);
0315     temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
0316     temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
0317     data->temp[nr][index] = temp;
0318     ret = i2c_smbus_write_byte_data(data->client,
0319                     index == 2 ? MAX6697_REG_MAX[nr]
0320                            : MAX6697_REG_CRIT[nr],
0321                     temp);
0322     mutex_unlock(&data->update_lock);
0323 
0324     return ret < 0 ? ret : count;
0325 }
0326 
0327 static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
0328                 size_t count)
0329 {
0330     int val, ret, index, select;
0331     struct max6697_data *data;
0332     bool channel_enabled;
0333     long temp;
0334 
0335     index = to_sensor_dev_attr(devattr)->index;
0336     data = dev_get_drvdata(dev);
0337     ret = kstrtol(buf, 10, &temp);
0338     if (ret < 0)
0339         return ret;
0340 
0341     mutex_lock(&data->update_lock);
0342     select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
0343     if (select < 0) {
0344         ret = select;
0345         goto abort;
0346     }
0347     channel_enabled = (select & (1 << (index - 1)));
0348     temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
0349     val = DIV_ROUND_CLOSEST(temp, 250);
0350     /* disable the offset for channel if the new offset is 0 */
0351     if (val == 0) {
0352         if (channel_enabled)
0353             ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
0354                             select & ~(1 << (index - 1)));
0355         ret = ret < 0 ? ret : count;
0356         goto abort;
0357     }
0358     if (!channel_enabled) {
0359         ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
0360                         select | (1 << (index - 1)));
0361         if (ret < 0)
0362             goto abort;
0363     }
0364     ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
0365     ret = ret < 0 ? ret : count;
0366 
0367 abort:
0368     mutex_unlock(&data->update_lock);
0369     return ret;
0370 }
0371 
0372 static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
0373 {
0374     struct max6697_data *data;
0375     int select, ret, index;
0376 
0377     index = to_sensor_dev_attr(devattr)->index;
0378     data = dev_get_drvdata(dev);
0379     mutex_lock(&data->update_lock);
0380     select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
0381     if (select < 0)
0382         ret = select;
0383     else if (select & (1 << (index - 1)))
0384         ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
0385     else
0386         ret = 0;
0387     mutex_unlock(&data->update_lock);
0388     return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
0389 }
0390 
0391 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
0392 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
0393 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
0394 
0395 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
0396 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
0397 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
0398 
0399 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
0400 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
0401 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
0402 
0403 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
0404 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
0405 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
0406 
0407 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
0408 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
0409 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
0410 
0411 static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
0412 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
0413 static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
0414 
0415 static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
0416 static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
0417 static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
0418 
0419 static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
0420 static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
0421 static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
0422 
0423 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
0424 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
0425 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
0426 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
0427 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
0428 static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
0429 static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
0430 static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
0431 
0432 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
0433 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
0434 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
0435 static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
0436 static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
0437 static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
0438 static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
0439 static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
0440 
0441 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
0442 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
0443 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
0444 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
0445 static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
0446 static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
0447 static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
0448 
0449 /* There is no offset for local temperature so starting from temp2 */
0450 static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
0451 static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
0452 static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
0453 static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
0454 static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
0455 static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
0456 static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
0457 
0458 static DEVICE_ATTR(dummy, 0, NULL, NULL);
0459 
0460 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
0461                   int index)
0462 {
0463     struct device *dev = kobj_to_dev(kobj);
0464     struct max6697_data *data = dev_get_drvdata(dev);
0465     const struct max6697_chip_data *chip = data->chip;
0466     int channel = index / 7;    /* channel number */
0467     int nr = index % 7;     /* attribute index within channel */
0468 
0469     if (channel >= chip->channels)
0470         return 0;
0471 
0472     if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
0473         return 0;
0474     if (nr == 5 && !(chip->have_fault & (1 << channel)))
0475         return 0;
0476     /* offset reg is only supported on max6581 remote channels */
0477     if (nr == 6)
0478         if (data->type != max6581 || channel == 0)
0479             return 0;
0480 
0481     return attr->mode;
0482 }
0483 
0484 /*
0485  * max6697_is_visible uses the index into the following array to determine
0486  * if attributes should be created or not. Any change in order or content
0487  * must be matched in max6697_is_visible.
0488  */
0489 static struct attribute *max6697_attributes[] = {
0490     &sensor_dev_attr_temp1_input.dev_attr.attr,
0491     &sensor_dev_attr_temp1_max.dev_attr.attr,
0492     &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
0493     &sensor_dev_attr_temp1_crit.dev_attr.attr,
0494     &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
0495     &dev_attr_dummy.attr,
0496     &dev_attr_dummy.attr,
0497 
0498     &sensor_dev_attr_temp2_input.dev_attr.attr,
0499     &sensor_dev_attr_temp2_max.dev_attr.attr,
0500     &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
0501     &sensor_dev_attr_temp2_crit.dev_attr.attr,
0502     &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
0503     &sensor_dev_attr_temp2_fault.dev_attr.attr,
0504     &sensor_dev_attr_temp2_offset.dev_attr.attr,
0505 
0506     &sensor_dev_attr_temp3_input.dev_attr.attr,
0507     &sensor_dev_attr_temp3_max.dev_attr.attr,
0508     &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
0509     &sensor_dev_attr_temp3_crit.dev_attr.attr,
0510     &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
0511     &sensor_dev_attr_temp3_fault.dev_attr.attr,
0512     &sensor_dev_attr_temp3_offset.dev_attr.attr,
0513 
0514     &sensor_dev_attr_temp4_input.dev_attr.attr,
0515     &sensor_dev_attr_temp4_max.dev_attr.attr,
0516     &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
0517     &sensor_dev_attr_temp4_crit.dev_attr.attr,
0518     &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
0519     &sensor_dev_attr_temp4_fault.dev_attr.attr,
0520     &sensor_dev_attr_temp4_offset.dev_attr.attr,
0521 
0522     &sensor_dev_attr_temp5_input.dev_attr.attr,
0523     &sensor_dev_attr_temp5_max.dev_attr.attr,
0524     &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
0525     &sensor_dev_attr_temp5_crit.dev_attr.attr,
0526     &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
0527     &sensor_dev_attr_temp5_fault.dev_attr.attr,
0528     &sensor_dev_attr_temp5_offset.dev_attr.attr,
0529 
0530     &sensor_dev_attr_temp6_input.dev_attr.attr,
0531     &sensor_dev_attr_temp6_max.dev_attr.attr,
0532     &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
0533     &sensor_dev_attr_temp6_crit.dev_attr.attr,
0534     &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
0535     &sensor_dev_attr_temp6_fault.dev_attr.attr,
0536     &sensor_dev_attr_temp6_offset.dev_attr.attr,
0537 
0538     &sensor_dev_attr_temp7_input.dev_attr.attr,
0539     &sensor_dev_attr_temp7_max.dev_attr.attr,
0540     &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
0541     &sensor_dev_attr_temp7_crit.dev_attr.attr,
0542     &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
0543     &sensor_dev_attr_temp7_fault.dev_attr.attr,
0544     &sensor_dev_attr_temp7_offset.dev_attr.attr,
0545 
0546     &sensor_dev_attr_temp8_input.dev_attr.attr,
0547     &sensor_dev_attr_temp8_max.dev_attr.attr,
0548     &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
0549     &sensor_dev_attr_temp8_crit.dev_attr.attr,
0550     &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
0551     &sensor_dev_attr_temp8_fault.dev_attr.attr,
0552     &sensor_dev_attr_temp8_offset.dev_attr.attr,
0553     NULL
0554 };
0555 
0556 static const struct attribute_group max6697_group = {
0557     .attrs = max6697_attributes, .is_visible = max6697_is_visible,
0558 };
0559 __ATTRIBUTE_GROUPS(max6697);
0560 
0561 static void max6697_get_config_of(struct device_node *node,
0562                   struct max6697_platform_data *pdata)
0563 {
0564     int len;
0565     const __be32 *prop;
0566 
0567     pdata->smbus_timeout_disable =
0568         of_property_read_bool(node, "smbus-timeout-disable");
0569     pdata->extended_range_enable =
0570         of_property_read_bool(node, "extended-range-enable");
0571     pdata->beta_compensation =
0572         of_property_read_bool(node, "beta-compensation-enable");
0573 
0574     prop = of_get_property(node, "alert-mask", &len);
0575     if (prop && len == sizeof(u32))
0576         pdata->alert_mask = be32_to_cpu(prop[0]);
0577     prop = of_get_property(node, "over-temperature-mask", &len);
0578     if (prop && len == sizeof(u32))
0579         pdata->over_temperature_mask = be32_to_cpu(prop[0]);
0580     prop = of_get_property(node, "resistance-cancellation", &len);
0581     if (prop) {
0582         if (len == sizeof(u32))
0583             pdata->resistance_cancellation = be32_to_cpu(prop[0]);
0584         else
0585             pdata->resistance_cancellation = 0xfe;
0586     }
0587     prop = of_get_property(node, "transistor-ideality", &len);
0588     if (prop && len == 2 * sizeof(u32)) {
0589             pdata->ideality_mask = be32_to_cpu(prop[0]);
0590             pdata->ideality_value = be32_to_cpu(prop[1]);
0591     }
0592 }
0593 
0594 static int max6697_init_chip(struct max6697_data *data,
0595                  struct i2c_client *client)
0596 {
0597     struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
0598     struct max6697_platform_data p;
0599     const struct max6697_chip_data *chip = data->chip;
0600     int factor = chip->channels;
0601     int ret, reg;
0602 
0603     /*
0604      * Don't touch configuration if neither platform data nor OF
0605      * configuration was specified. If that is the case, use the
0606      * current chip configuration.
0607      */
0608     if (!pdata && !client->dev.of_node) {
0609         reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
0610         if (reg < 0)
0611             return reg;
0612         if (data->type == max6581) {
0613             if (reg & MAX6581_CONF_EXTENDED)
0614                 data->temp_offset = 64;
0615             reg = i2c_smbus_read_byte_data(client,
0616                                MAX6581_REG_RESISTANCE);
0617             if (reg < 0)
0618                 return reg;
0619             factor += hweight8(reg);
0620         } else {
0621             if (reg & MAX6697_CONF_RESISTANCE)
0622                 factor++;
0623         }
0624         goto done;
0625     }
0626 
0627     if (client->dev.of_node) {
0628         memset(&p, 0, sizeof(p));
0629         max6697_get_config_of(client->dev.of_node, &p);
0630         pdata = &p;
0631     }
0632 
0633     reg = 0;
0634     if (pdata->smbus_timeout_disable &&
0635         (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
0636         reg |= MAX6697_CONF_TIMEOUT;
0637     }
0638     if (pdata->extended_range_enable &&
0639         (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
0640         reg |= MAX6581_CONF_EXTENDED;
0641         data->temp_offset = 64;
0642     }
0643     if (pdata->resistance_cancellation &&
0644         (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
0645         reg |= MAX6697_CONF_RESISTANCE;
0646         factor++;
0647     }
0648     if (pdata->beta_compensation &&
0649         (chip->valid_conf & MAX6693_CONF_BETA)) {
0650         reg |= MAX6693_CONF_BETA;
0651     }
0652 
0653     ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
0654     if (ret < 0)
0655         return ret;
0656 
0657     ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
0658                 MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
0659     if (ret < 0)
0660         return ret;
0661 
0662     ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
0663             MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
0664     if (ret < 0)
0665         return ret;
0666 
0667     if (data->type == max6581) {
0668         factor += hweight8(pdata->resistance_cancellation >> 1);
0669         ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
0670                     pdata->resistance_cancellation >> 1);
0671         if (ret < 0)
0672             return ret;
0673         ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
0674                         pdata->ideality_value);
0675         if (ret < 0)
0676             return ret;
0677         ret = i2c_smbus_write_byte_data(client,
0678                         MAX6581_REG_IDEALITY_SELECT,
0679                         pdata->ideality_mask >> 1);
0680         if (ret < 0)
0681             return ret;
0682     }
0683 done:
0684     data->update_interval = factor * MAX6697_CONV_TIME;
0685     return 0;
0686 }
0687 
0688 static const struct i2c_device_id max6697_id[];
0689 
0690 static int max6697_probe(struct i2c_client *client)
0691 {
0692     struct i2c_adapter *adapter = client->adapter;
0693     struct device *dev = &client->dev;
0694     struct max6697_data *data;
0695     struct device *hwmon_dev;
0696     int err;
0697 
0698     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
0699         return -ENODEV;
0700 
0701     data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
0702     if (!data)
0703         return -ENOMEM;
0704 
0705     if (client->dev.of_node)
0706         data->type = (enum chips)of_device_get_match_data(&client->dev);
0707     else
0708         data->type = i2c_match_id(max6697_id, client)->driver_data;
0709     data->chip = &max6697_chip_data[data->type];
0710     data->client = client;
0711     mutex_init(&data->update_lock);
0712 
0713     err = max6697_init_chip(data, client);
0714     if (err)
0715         return err;
0716 
0717     hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
0718                                data,
0719                                max6697_groups);
0720     return PTR_ERR_OR_ZERO(hwmon_dev);
0721 }
0722 
0723 static const struct i2c_device_id max6697_id[] = {
0724     { "max6581", max6581 },
0725     { "max6602", max6602 },
0726     { "max6622", max6622 },
0727     { "max6636", max6636 },
0728     { "max6689", max6689 },
0729     { "max6693", max6693 },
0730     { "max6694", max6694 },
0731     { "max6697", max6697 },
0732     { "max6698", max6698 },
0733     { "max6699", max6699 },
0734     { }
0735 };
0736 MODULE_DEVICE_TABLE(i2c, max6697_id);
0737 
0738 static const struct of_device_id __maybe_unused max6697_of_match[] = {
0739     {
0740         .compatible = "maxim,max6581",
0741         .data = (void *)max6581
0742     },
0743     {
0744         .compatible = "maxim,max6602",
0745         .data = (void *)max6602
0746     },
0747     {
0748         .compatible = "maxim,max6622",
0749         .data = (void *)max6622
0750     },
0751     {
0752         .compatible = "maxim,max6636",
0753         .data = (void *)max6636
0754     },
0755     {
0756         .compatible = "maxim,max6689",
0757         .data = (void *)max6689
0758     },
0759     {
0760         .compatible = "maxim,max6693",
0761         .data = (void *)max6693
0762     },
0763     {
0764         .compatible = "maxim,max6694",
0765         .data = (void *)max6694
0766     },
0767     {
0768         .compatible = "maxim,max6697",
0769         .data = (void *)max6697
0770     },
0771     {
0772         .compatible = "maxim,max6698",
0773         .data = (void *)max6698
0774     },
0775     {
0776         .compatible = "maxim,max6699",
0777         .data = (void *)max6699
0778     },
0779     { },
0780 };
0781 MODULE_DEVICE_TABLE(of, max6697_of_match);
0782 
0783 static struct i2c_driver max6697_driver = {
0784     .class = I2C_CLASS_HWMON,
0785     .driver = {
0786         .name   = "max6697",
0787         .of_match_table = of_match_ptr(max6697_of_match),
0788     },
0789     .probe_new = max6697_probe,
0790     .id_table = max6697_id,
0791 };
0792 
0793 module_i2c_driver(max6697_driver);
0794 
0795 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
0796 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
0797 MODULE_LICENSE("GPL");
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