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_3rail,
  71         raa_dmpvr2_hv,
  72 };
  73
  74 static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
  75                                              int page,
  76                                              char *buf)
  77 {
  78         int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
  79
  80         return sprintf(buf, "%d\n",
  81                        (val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
  82 }
  83
  84 static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
  85                                               int page,
  86                                               const char *buf, size_t count)
  87 {
  88         int rc, op_val;
  89         bool result;
  90
  91         rc = kstrtobool(buf, &result);
  92         if (rc)
  93                 return rc;
  94
  95         op_val = result ? ISL68137_VOUT_AVS : 0;
  96
  97         /*
  98          * Writes to VOUT setpoint over AVSBus will persist after the VRM is
  99          * switched to PMBus control. Switching back to AVSBus control
 100          * restores this persisted setpoint rather than re-initializing to
 101          * PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
 102          * enabling AVS control is the workaround.
 103          */
 104         if (op_val == ISL68137_VOUT_AVS) {
 105                 rc = pmbus_read_word_data(client, page, 0xff,
 106                                           PMBUS_VOUT_COMMAND);
 107                 if (rc < 0)
 108                         return rc;
 109
 110                 rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
 111                                            rc);
 112                 if (rc < 0)
 113                         return rc;
 114         }
 115
 116         rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
 117                                     ISL68137_VOUT_AVS, op_val);
 118
 119         return (rc < 0) ? rc : count;
 120 }
 121
 122 static ssize_t isl68137_avs_enable_show(struct device *dev,
 123                                         struct device_attribute *devattr,
 124                                         char *buf)
 125 {
 126         struct i2c_client *client = to_i2c_client(dev->parent);
 127         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 128
 129         return isl68137_avs_enable_show_page(client, attr->index, buf);
 130 }
 131
 132 static ssize_t isl68137_avs_enable_store(struct device *dev,
 133                                 struct device_attribute *devattr,
 134                                 const char *buf, size_t count)
 135 {
 136         struct i2c_client *client = to_i2c_client(dev->parent);
 137         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 138
 139         return isl68137_avs_enable_store_page(client, attr->index, buf, count);
 140 }
 141
 142 static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
 143 static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
 144
 145 static struct attribute *enable_attrs[] = {
 146         &sensor_dev_attr_avs0_enable.dev_attr.attr,
 147         &sensor_dev_attr_avs1_enable.dev_attr.attr,
 148         NULL,
 149 };
 150
 151 static const struct attribute_group enable_group = {
 152         .attrs = enable_attrs,
 153 };
 154
 155 static const struct attribute_group *isl68137_attribute_groups[] = {
 156         &enable_group,
 157         NULL,
 158 };
 159
 160 static int raa_dmpvr2_read_word_data(struct i2c_client *client, int page,
 161                                      int phase, int reg)
 162 {
 163         int ret;
 164
 165         switch (reg) {
 166         case PMBUS_VIRT_READ_VMON:
 167                 ret = pmbus_read_word_data(client, page, phase,
 168                                            RAA_DMPVR2_READ_VMON);
 169                 break;
 170         default:
 171                 ret = -ENODATA;
 172                 break;
 173         }
 174
 175         return ret;
 176 }
 177
 178 static struct pmbus_driver_info raa_dmpvr_info = {
 179         .pages = 3,
 180         .format[PSC_VOLTAGE_IN] = direct,
 181         .format[PSC_VOLTAGE_OUT] = direct,
 182         .format[PSC_CURRENT_IN] = direct,
 183         .format[PSC_CURRENT_OUT] = direct,
 184         .format[PSC_POWER] = direct,
 185         .format[PSC_TEMPERATURE] = direct,
 186         .m[PSC_VOLTAGE_IN] = 1,
 187         .b[PSC_VOLTAGE_IN] = 0,
 188         .R[PSC_VOLTAGE_IN] = 2,
 189         .m[PSC_VOLTAGE_OUT] = 1,
 190         .b[PSC_VOLTAGE_OUT] = 0,
 191         .R[PSC_VOLTAGE_OUT] = 3,
 192         .m[PSC_CURRENT_IN] = 1,
 193         .b[PSC_CURRENT_IN] = 0,
 194         .R[PSC_CURRENT_IN] = 2,
 195         .m[PSC_CURRENT_OUT] = 1,
 196         .b[PSC_CURRENT_OUT] = 0,
 197         .R[PSC_CURRENT_OUT] = 1,
 198         .m[PSC_POWER] = 1,
 199         .b[PSC_POWER] = 0,
 200         .R[PSC_POWER] = 0,
 201         .m[PSC_TEMPERATURE] = 1,
 202         .b[PSC_TEMPERATURE] = 0,
 203         .R[PSC_TEMPERATURE] = 0,
 204         .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
 205             | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
 206             | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 207             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 208             | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
 209                 | PMBUS_HAVE_VMON,
 210         .func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
 211             | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 212             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
 213             | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 214         .func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
 215             | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
 216             | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
 217             | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 218 };
 219
 220 static int isl68137_probe(struct i2c_client *client,
 221                           const struct i2c_device_id *id)
 222 {
 223         struct pmbus_driver_info *info;
 224
 225         info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
 226         if (!info)
 227                 return -ENOMEM;
 228         memcpy(info, &raa_dmpvr_info, sizeof(*info));
 229
 230         switch (id->driver_data) {
 231         case raa_dmpvr1_2rail:
 232                 info->pages = 2;
 233                 info->R[PSC_VOLTAGE_IN] = 3;
 234                 info->func[0] &= ~PMBUS_HAVE_VMON;
 235                 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 236                     | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 237                     | PMBUS_HAVE_POUT;
 238                 info->groups = isl68137_attribute_groups;
 239                 break;
 240         case raa_dmpvr2_1rail:
 241                 info->pages = 1;
 242                 info->read_word_data = raa_dmpvr2_read_word_data;
 243                 break;
 244         case raa_dmpvr2_2rail:
 245                 info->pages = 2;
 246                 info->read_word_data = raa_dmpvr2_read_word_data;
 247                 break;
 248         case raa_dmpvr2_3rail:
 249                 info->read_word_data = raa_dmpvr2_read_word_data;
 250                 break;
 251         case raa_dmpvr2_hv:
 252                 info->pages = 1;
 253                 info->R[PSC_VOLTAGE_IN] = 1;
 254                 info->m[PSC_VOLTAGE_OUT] = 2;
 255                 info->R[PSC_VOLTAGE_OUT] = 2;
 256                 info->m[PSC_CURRENT_IN] = 2;
 257                 info->m[PSC_POWER] = 2;
 258                 info->R[PSC_POWER] = -1;
 259                 info->read_word_data = raa_dmpvr2_read_word_data;
 260                 break;
 261         default:
 262                 return -ENODEV;
 263         }
 264
 265         return pmbus_do_probe(client, id, info);
 266 }
 267
 268 static const struct i2c_device_id raa_dmpvr_id[] = {
 269         {"isl68137", raa_dmpvr1_2rail},
 270         {"isl68220", raa_dmpvr2_2rail},
 271         {"isl68221", raa_dmpvr2_3rail},
 272         {"isl68222", raa_dmpvr2_2rail},
 273         {"isl68223", raa_dmpvr2_2rail},
 274         {"isl68224", raa_dmpvr2_3rail},
 275         {"isl68225", raa_dmpvr2_2rail},
 276         {"isl68226", raa_dmpvr2_3rail},
 277         {"isl68227", raa_dmpvr2_1rail},
 278         {"isl68229", raa_dmpvr2_3rail},
 279         {"isl68233", raa_dmpvr2_2rail},
 280         {"isl68239", raa_dmpvr2_3rail},
 281
 282         {"isl69222", raa_dmpvr2_2rail},
 283         {"isl69223", raa_dmpvr2_3rail},
 284         {"isl69224", raa_dmpvr2_2rail},
 285         {"isl69225", raa_dmpvr2_2rail},
 286         {"isl69227", raa_dmpvr2_3rail},
 287         {"isl69228", raa_dmpvr2_3rail},
 288         {"isl69234", raa_dmpvr2_2rail},
 289         {"isl69236", raa_dmpvr2_2rail},
 290         {"isl69239", raa_dmpvr2_3rail},
 291         {"isl69242", raa_dmpvr2_2rail},
 292         {"isl69243", raa_dmpvr2_1rail},
 293         {"isl69247", raa_dmpvr2_2rail},
 294         {"isl69248", raa_dmpvr2_2rail},
 295         {"isl69254", raa_dmpvr2_2rail},
 296         {"isl69255", raa_dmpvr2_2rail},
 297         {"isl69256", raa_dmpvr2_2rail},
 298         {"isl69259", raa_dmpvr2_2rail},
 299         {"isl69260", raa_dmpvr2_2rail},
 300         {"isl69268", raa_dmpvr2_2rail},
 301         {"isl69269", raa_dmpvr2_3rail},
 302         {"isl69298", raa_dmpvr2_2rail},
 303
 304         {"raa228000", raa_dmpvr2_hv},
 305         {"raa228004", raa_dmpvr2_hv},
 306         {"raa228006", raa_dmpvr2_hv},
 307         {"raa228228", raa_dmpvr2_2rail},
 308         {"raa229001", raa_dmpvr2_2rail},
 309         {"raa229004", raa_dmpvr2_2rail},
 310         {}
 311 };
 312
 313 MODULE_DEVICE_TABLE(i2c, raa_dmpvr_id);
 314
 315 /* This is the driver that will be inserted */
 316 static struct i2c_driver isl68137_driver = {
 317         .driver = {
 318                    .name = "isl68137",
 319                    },
 320         .probe = isl68137_probe,
 321         .remove = pmbus_do_remove,
 322         .id_table = raa_dmpvr_id,
 323 };
 324
 325 module_i2c_driver(isl68137_driver);
 326
 327 MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
 328 MODULE_DESCRIPTION("PMBus driver for Renesas digital multiphase voltage regulators");
 329 MODULE_LICENSE("GPL");