drivers/hwmon/pmbus/isl68137.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Hardware monitoring driver for Renesas Digital Multiphase Voltage Regulators
   4  *
   5  * Copyright (c) 2017 Google Inc
   6  * Copyright (c) 2020 Renesas Electronics America
   7  *
   8  */
   9
  10 #include <linux/err.h>
  11 #include <linux/hwmon-sysfs.h>
  12 #include <linux/i2c.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/sysfs.h>
  18
  19 #include "pmbus.h"
  20
  21 #define ISL68137_VOUT_AVS       0x30
  22 #define RAA_DMPVR2_READ_VMON    0xc8
  23
  24 enum chips {
  25         isl68137,
  26         isl68220,
  27         isl68221,
  28         isl68222,
  29         isl68223,
  30         isl68224,
  31         isl68225,
  32         isl68226,
  33         isl68227,
  34         isl68229,
  35         isl68233,
  36         isl68239,
  37         isl69222,
  38         isl69223,
  39         isl69224,
  40         isl69225,
  41         isl69227,
  42         isl69228,
  43         isl69234,
  44         isl69236,
  45         isl69239,
  46         isl69242,
  47         isl69243,
  48         isl69247,
  49         isl69248,
  50         isl69254,
  51         isl69255,
  52         isl69256,
  53         isl69259,
  54         isl69260,
  55         isl69268,
  56         isl69269,
  57         isl69298,
  58         raa228000,
  59         raa228004,
  60         raa228006,
  61         raa228228,
  62         raa229001,
  63         raa229004,
  64 };
  65
  66 enum variants {
  67         raa_dmpvr1_2rail,
  68         raa_dmpvr2_1rail,
  69         raa_dmpvr2_2rail,
  70         raa_dmpvr2_2rail_nontc,
  71         raa_dmpvr2_3rail,
  72         raa_dmpvr2_hv,
  73 };
  74
  75 static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
  76                                              int page,
  77                                              char *buf)
  78 {
  79         int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
  80
  81         return sprintf(buf, "%d\n",
  82                        (val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
  83 }
  84
  85 static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
  86                                               int page,
  87                                               const char *buf, size_t count)
  88 {
  89         int rc, op_val;
  90         bool result;
  91
  92         rc = kstrtobool(buf, &result);
  93         if (rc)
  94                 return rc;
  95
  96         op_val = result ? ISL68137_VOUT_AVS : 0;
  97
  98         /*
  99          * Writes to VOUT setpoint over AVSBus will persist after the VRM is
 100          * switched to PMBus control. Switching back to AVSBus control
 101          * restores this persisted setpoint rather than re-initializing to
 102          * PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
 103          * enabling AVS control is the workaround.
 104          */
 105         if (op_val == ISL68137_VOUT_AVS) {
 106                 rc = pmbus_read_word_data(client, page, 0xff,
 107                                           PMBUS_VOUT_COMMAND);
 108                 if (rc < 0)
 109                         return rc;
 110
 111                 rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
 112                                            rc);
 113                 if (rc < 0)
 114                         return rc;
 115         }
 116
 117         rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
 118                                     ISL68137_VOUT_AVS, op_val);
 119
 120         return (rc < 0) ? rc : count;
 121 }
 122
 123 static ssize_t isl68137_avs_enable_show(struct device *dev,
 124                                         struct device_attribute *devattr,
 125                                         char *buf)
 126 {
 127         struct i2c_client *client = to_i2c_client(dev->parent);
 128         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 129
 130         return isl68137_avs_enable_show_page(client, attr->index, buf);
 131 }
 132
 133 static ssize_t isl68137_avs_enable_store(struct device *dev,
 134                                 struct device_attribute *devattr,
 135                                 const char *buf, size_t count)
 136 {
 137         struct i2c_client *client = to_i2c_client(dev->parent);
 138         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 139
 140         return isl68137_avs_enable_store_page(client, attr->index, buf, count);
 141 }
 142
 143 static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
 144 static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
 145
 146 static struct attribute *enable_attrs[] = {
 147         &sensor_dev_attr_avs0_enable.dev_attr.attr,
 148         &sensor_dev_attr_avs1_enable.dev_attr.attr,
 149         NULL,
 150 };
 151
 152 static const struct attribute_group enable_group = {
 153         .attrs = enable_attrs,
 154 };
 155
 156 static const struct attribute_group *isl68137_attribute_groups[] = {
 157         &enable_group,
 158         NULL,
 159 };
 160
 161 static int raa_dmpvr2_read_word_data(struct i2c_client *client, int page,
 162                                      int phase, int reg)
 163 {
 164         int ret;
 165
 166         switch (reg) {
 167         case PMBUS_VIRT_READ_VMON:
 168                 ret = pmbus_read_word_data(client, page, phase,
 169                                            RAA_DMPVR2_READ_VMON);
 170                 break;
 171         default:
 172                 ret = -ENODATA;
 173                 break;
 174         }
 175
 176         return ret;
 177 }
 178
 179 static struct pmbus_driver_info raa_dmpvr_info = {
 180         .pages = 3,
 181         .format[PSC_VOLTAGE_IN] = direct,
 182         .format[PSC_VOLTAGE_OUT] = direct,
 183         .format[PSC_CURRENT_IN] = direct,
 184         .format[PSC_CURRENT_OUT] = direct,
 185         .format[PSC_POWER] = direct,
 186         .format[PSC_TEMPERATURE] = direct,
 187         .m[PSC_VOLTAGE_IN] = 1,
 188         .b[PSC_VOLTAGE_IN] = 0,
 189         .R[PSC_VOLTAGE_IN] = 2,
 190         .m[PSC_VOLTAGE_OUT] = 1,
 191         .b[PSC_VOLTAGE_OUT] = 0,
 192         .R[PSC_VOLTAGE_OUT] = 3,
 193         .m[PSC_CURRENT_IN] = 1,
 194         .b[PSC_CURRENT_IN] = 0,
 195         .R[PSC_CURRENT_IN] = 2,
 196         .m[PSC_CURRENT_OUT] = 1,
 197         .b[PSC_CURRENT_OUT] = 0,
 198         .R[PSC_CURRENT_OUT] = 1,
 199         .m[PSC_POWER] = 1,
 200         .b[PSC_POWER] = 0,
 201         .R[PSC_POWER] = 0,
 202         .m[PSC_TEMPERATURE] = 1,
 203         .b[PSC_TEMPERATURE] = 0,
 204         .R[PSC_TEMPERATURE] = 0,
 205         .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
 206             | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
 207             | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 208             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 209             | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
 210                 | PMBUS_HAVE_VMON,
 211         .func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
 212             | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 213             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
 214             | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 215         .func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
 216             | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 217             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
 218             | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 219 };
 220
 221 static int isl68137_probe(struct i2c_client *client,
 222                           const struct i2c_device_id *id)
 223 {
 224         struct pmbus_driver_info *info;
 225
 226         info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
 227         if (!info)
 228                 return -ENOMEM;
 229         memcpy(info, &raa_dmpvr_info, sizeof(*info));
 230
 231         switch (id->driver_data) {
 232         case raa_dmpvr1_2rail:
 233                 info->pages = 2;
 234                 info->R[PSC_VOLTAGE_IN] = 3;
 235                 info->func[0] &= ~PMBUS_HAVE_VMON;
 236                 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 237                     | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 238                     | PMBUS_HAVE_POUT;
 239                 info->groups = isl68137_attribute_groups;
 240                 break;
 241         case raa_dmpvr2_1rail:
 242                 info->pages = 1;
 243                 info->read_word_data = raa_dmpvr2_read_word_data;
 244                 break;
 245         case raa_dmpvr2_2rail_nontc:
 246                 info->func[0] &= ~PMBUS_HAVE_TEMP;
 247                 info->func[1] &= ~PMBUS_HAVE_TEMP;
 248                 fallthrough;
 249         case raa_dmpvr2_2rail:
 250                 info->pages = 2;
 251                 info->read_word_data = raa_dmpvr2_read_word_data;
 252                 break;
 253         case raa_dmpvr2_3rail:
 254                 info->read_word_data = raa_dmpvr2_read_word_data;
 255                 break;
 256         case raa_dmpvr2_hv:
 257                 info->pages = 1;
 258                 info->R[PSC_VOLTAGE_IN] = 1;
 259                 info->m[PSC_VOLTAGE_OUT] = 2;
 260                 info->R[PSC_VOLTAGE_OUT] = 2;
 261                 info->m[PSC_CURRENT_IN] = 2;
 262                 info->m[PSC_POWER] = 2;
 263                 info->R[PSC_POWER] = -1;
 264                 info->read_word_data = raa_dmpvr2_read_word_data;
 265                 break;
 266         default:
 267                 return -ENODEV;
 268         }
 269
 270         return pmbus_do_probe(client, id, info);
 271 }
 272
 273 static const struct i2c_device_id raa_dmpvr_id[] = {
 274         {"isl68137", raa_dmpvr1_2rail},
 275         {"isl68220", raa_dmpvr2_2rail},
 276         {"isl68221", raa_dmpvr2_3rail},
 277         {"isl68222", raa_dmpvr2_2rail},
 278         {"isl68223", raa_dmpvr2_2rail},
 279         {"isl68224", raa_dmpvr2_3rail},
 280         {"isl68225", raa_dmpvr2_2rail},
 281         {"isl68226", raa_dmpvr2_3rail},
 282         {"isl68227", raa_dmpvr2_1rail},
 283         {"isl68229", raa_dmpvr2_3rail},
 284         {"isl68233", raa_dmpvr2_2rail},
 285         {"isl68239", raa_dmpvr2_3rail},
 286
 287         {"isl69222", raa_dmpvr2_2rail},
 288         {"isl69223", raa_dmpvr2_3rail},
 289         {"isl69224", raa_dmpvr2_2rail},
 290         {"isl69225", raa_dmpvr2_2rail},
 291         {"isl69227", raa_dmpvr2_3rail},
 292         {"isl69228", raa_dmpvr2_3rail},
 293         {"isl69234", raa_dmpvr2_2rail},
 294         {"isl69236", raa_dmpvr2_2rail},
 295         {"isl69239", raa_dmpvr2_3rail},
 296         {"isl69242", raa_dmpvr2_2rail},
 297         {"isl69243", raa_dmpvr2_1rail},
 298         {"isl69247", raa_dmpvr2_2rail},
 299         {"isl69248", raa_dmpvr2_2rail},
 300         {"isl69254", raa_dmpvr2_2rail},
 301         {"isl69255", raa_dmpvr2_2rail},
 302         {"isl69256", raa_dmpvr2_2rail},
 303         {"isl69259", raa_dmpvr2_2rail},
 304         {"isl69260", raa_dmpvr2_2rail},
 305         {"isl69268", raa_dmpvr2_2rail},
 306         {"isl69269", raa_dmpvr2_3rail},
 307         {"isl69298", raa_dmpvr2_2rail},
 308
 309         {"raa228000", raa_dmpvr2_hv},
 310         {"raa228004", raa_dmpvr2_hv},
 311         {"raa228006", raa_dmpvr2_hv},
 312         {"raa228228", raa_dmpvr2_2rail_nontc},
 313         {"raa229001", raa_dmpvr2_2rail},
 314         {"raa229004", raa_dmpvr2_2rail},
 315         {}
 316 };
 317
 318 MODULE_DEVICE_TABLE(i2c, raa_dmpvr_id);
 319
 320 /* This is the driver that will be inserted */
 321 static struct i2c_driver isl68137_driver = {
 322         .driver = {
 323                    .name = "isl68137",
 324                    },
 325         .probe = isl68137_probe,
 326         .remove = pmbus_do_remove,
 327         .id_table = raa_dmpvr_id,
 328 };
 329
 330 module_i2c_driver(isl68137_driver);
 331
 332 MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
 333 MODULE_DESCRIPTION("PMBus driver for Renesas digital multiphase voltage regulators");
 334 MODULE_LICENSE("GPL");