drivers/hwmon/pmbus/mp2993.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2993)
   4  */
   5
   6 #include <linux/i2c.h>
   7 #include <linux/module.h>
   8 #include <linux/of_device.h>
   9 #include "pmbus.h"
  10
  11 #define MP2993_VOUT_OVUV_UINT   125
  12 #define MP2993_VOUT_OVUV_DIV    64
  13 #define MP2993_VIN_LIMIT_UINT   1
  14 #define MP2993_VIN_LIMIT_DIV    8
  15 #define MP2993_READ_VIN_UINT    1
  16 #define MP2993_READ_VIN_DIV     32
  17
  18 #define MP2993_PAGE_NUM 2
  19
  20 #define MP2993_RAIL1_FUNC       (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
  21                                                         PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \
  22                                                         PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \
  23                                                         PMBUS_HAVE_IIN | \
  24                                                         PMBUS_HAVE_STATUS_VOUT | \
  25                                                         PMBUS_HAVE_STATUS_IOUT | \
  26                                                         PMBUS_HAVE_STATUS_TEMP | \
  27                                                         PMBUS_HAVE_STATUS_INPUT)
  28
  29 #define MP2993_RAIL2_FUNC       (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \
  30                                                          PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \
  31                                                          PMBUS_HAVE_STATUS_VOUT | \
  32                                                          PMBUS_HAVE_STATUS_IOUT | \
  33                                                          PMBUS_HAVE_STATUS_TEMP | \
  34                                                          PMBUS_HAVE_STATUS_INPUT)
  35
  36 /* Converts a linear11 data exponent to a specified value */
  37 static u16 mp2993_linear11_exponent_transfer(u16 word, u16 expect_exponent)
  38 {
  39         s16 exponent, mantissa, target_exponent;
  40
  41         exponent = ((s16)word) >> 11;
  42         mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
  43         target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11;
  44
  45         if (exponent > target_exponent)
  46                 mantissa = mantissa << (exponent - target_exponent);
  47         else
  48                 mantissa = mantissa >> (target_exponent - exponent);
  49
  50         return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800);
  51 }
  52
  53 static int
  54 mp2993_set_vout_format(struct i2c_client *client, int page, int format)
  55 {
  56         int ret;
  57
  58         ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
  59         if (ret < 0)
  60                 return ret;
  61
  62         return i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, format);
  63 }
  64
  65 static int mp2993_identify(struct i2c_client *client, struct pmbus_driver_info *info)
  66 {
  67         int ret;
  68
  69         /* Set vout to direct format for rail1. */
  70         ret = mp2993_set_vout_format(client, 0, PB_VOUT_MODE_DIRECT);
  71         if (ret < 0)
  72                 return ret;
  73
  74         /* Set vout to direct format for rail2. */
  75         return mp2993_set_vout_format(client, 1, PB_VOUT_MODE_DIRECT);
  76 }
  77
  78 static int mp2993_read_word_data(struct i2c_client *client, int page, int phase,
  79                                  int reg)
  80 {
  81         int ret;
  82
  83         switch (reg) {
  84         case PMBUS_VOUT_OV_FAULT_LIMIT:
  85         case PMBUS_VOUT_UV_FAULT_LIMIT:
  86                 ret = pmbus_read_word_data(client, page, phase, reg);
  87                 if (ret < 0)
  88                         return ret;
  89
  90                 ret = DIV_ROUND_CLOSEST(ret * MP2993_VOUT_OVUV_UINT, MP2993_VOUT_OVUV_DIV);
  91                 break;
  92         case PMBUS_OT_FAULT_LIMIT:
  93         case PMBUS_OT_WARN_LIMIT:
  94                 /*
  95                  * The MP2993 ot fault limit value and ot warn limit value
  96                  * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
  97                  * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
  98                  * indicates the limit value.
  99                  */
 100                 ret = pmbus_read_word_data(client, 0, phase, reg);
 101                 break;
 102         case PMBUS_READ_VIN:
 103                 /* The MP2993 vin scale is (1/32V)/Lsb */
 104                 ret = pmbus_read_word_data(client, page, phase, reg);
 105                 if (ret < 0)
 106                         return ret;
 107
 108                 ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)) * MP2993_READ_VIN_UINT,
 109                                         MP2993_READ_VIN_DIV);
 110                 break;
 111         case PMBUS_VIN_OV_FAULT_LIMIT:
 112         case PMBUS_VIN_OV_WARN_LIMIT:
 113         case PMBUS_VIN_UV_WARN_LIMIT:
 114         case PMBUS_VIN_UV_FAULT_LIMIT:
 115                 /* The MP2993 vin limit scale is (1/8V)/Lsb */
 116                 ret = pmbus_read_word_data(client, page, phase, reg);
 117                 if (ret < 0)
 118                         return ret;
 119
 120                 ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * MP2993_VIN_LIMIT_UINT,
 121                                         MP2993_VIN_LIMIT_DIV);
 122                 break;
 123         case PMBUS_READ_IOUT:
 124         case PMBUS_READ_IIN:
 125         case PMBUS_IIN_OC_WARN_LIMIT:
 126         case PMBUS_IOUT_OC_FAULT_LIMIT:
 127         case PMBUS_IOUT_OC_WARN_LIMIT:
 128         case PMBUS_READ_VOUT:
 129         case PMBUS_READ_PIN:
 130         case PMBUS_READ_POUT:
 131         case PMBUS_READ_TEMPERATURE_1:
 132                 ret = -ENODATA;
 133                 break;
 134         default:
 135                 ret = -EINVAL;
 136                 break;
 137         }
 138
 139         return ret;
 140 }
 141
 142 static int mp2993_write_word_data(struct i2c_client *client, int page, int reg,
 143                                   u16 word)
 144 {
 145         int ret;
 146
 147         switch (reg) {
 148         case PMBUS_VOUT_OV_FAULT_LIMIT:
 149         case PMBUS_VOUT_UV_FAULT_LIMIT:
 150                 ret = DIV_ROUND_CLOSEST(word * MP2993_VOUT_OVUV_DIV, MP2993_VOUT_OVUV_UINT);
 151                 ret = pmbus_write_word_data(client, 0, reg, ret);
 152                 break;
 153         case PMBUS_OT_FAULT_LIMIT:
 154         case PMBUS_OT_WARN_LIMIT:
 155                 /*
 156                  * The MP2993 ot fault limit value and ot warn limit value
 157                  * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
 158                  * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
 159                  * config the ot limit value.
 160                  */
 161                 ret = pmbus_write_word_data(client, 0, reg, word);
 162                 break;
 163         case PMBUS_VIN_OV_FAULT_LIMIT:
 164         case PMBUS_VIN_OV_WARN_LIMIT:
 165         case PMBUS_VIN_UV_WARN_LIMIT:
 166         case PMBUS_VIN_UV_FAULT_LIMIT:
 167                 /* The MP2993 vin limit scale is (1/8V)/Lsb */
 168                 ret = pmbus_write_word_data(client, 0, reg,
 169                                             DIV_ROUND_CLOSEST(word * MP2993_VIN_LIMIT_DIV,
 170                                                               MP2993_VIN_LIMIT_UINT));
 171                 break;
 172         case PMBUS_IIN_OC_WARN_LIMIT:
 173                 /*
 174                  * The PMBUS_IIN_OC_WARN_LIMIT of MP2993 is linear11 format,
 175                  * and the exponent is a constant value(5'b00000)， so the
 176                  * exponent of word parameter should be converted to 5'b00000.
 177                  */
 178                 ret = pmbus_write_word_data(client, page, reg,
 179                                             mp2993_linear11_exponent_transfer(word, 0x00));
 180                 break;
 181                 //
 182         case PMBUS_IOUT_OC_FAULT_LIMIT:
 183         case PMBUS_IOUT_OC_WARN_LIMIT:
 184                 /*
 185                  * The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT
 186                  * of MP2993 can be regarded as linear11 format, and the
 187                  * exponent is a 5'b00001 or 5'b00000. To ensure a larger
 188                  * range of limit value, so the exponent of word parameter
 189                  * should be converted to 5'b00001.
 190                  */
 191                 ret = pmbus_write_word_data(client, page, reg,
 192                                             mp2993_linear11_exponent_transfer(word, 0x01));
 193                 break;
 194         default:
 195                 ret = -EINVAL;
 196                 break;
 197         }
 198
 199         return ret;
 200 }
 201
 202 static struct pmbus_driver_info mp2993_info = {
 203         .pages = MP2993_PAGE_NUM,
 204         .format[PSC_VOLTAGE_IN] = direct,
 205         .format[PSC_CURRENT_IN] = linear,
 206         .format[PSC_CURRENT_OUT] = linear,
 207         .format[PSC_TEMPERATURE] = direct,
 208         .format[PSC_POWER] = linear,
 209         .format[PSC_VOLTAGE_OUT] = direct,
 210
 211         .m[PSC_VOLTAGE_OUT] = 1,
 212         .R[PSC_VOLTAGE_OUT] = 3,
 213         .b[PSC_VOLTAGE_OUT] = 0,
 214
 215         .m[PSC_VOLTAGE_IN] = 1,
 216         .R[PSC_VOLTAGE_IN] = 0,
 217         .b[PSC_VOLTAGE_IN] = 0,
 218
 219         .m[PSC_TEMPERATURE] = 1,
 220         .R[PSC_TEMPERATURE] = 0,
 221         .b[PSC_TEMPERATURE] = 0,
 222
 223         .func[0] = MP2993_RAIL1_FUNC,
 224         .func[1] = MP2993_RAIL2_FUNC,
 225         .read_word_data = mp2993_read_word_data,
 226         .write_word_data = mp2993_write_word_data,
 227         .identify = mp2993_identify,
 228 };
 229
 230 static int mp2993_probe(struct i2c_client *client)
 231 {
 232         return pmbus_do_probe(client, &mp2993_info);
 233 }
 234
 235 static const struct i2c_device_id mp2993_id[] = {
 236         { "mp2993" },
 237         { }
 238 };
 239 MODULE_DEVICE_TABLE(i2c, mp2993_id);
 240
 241 static const struct of_device_id __maybe_unused mp2993_of_match[] = {
 242         {.compatible = "mps,mp2993"},
 243         {}
 244 };
 245 MODULE_DEVICE_TABLE(of, mp2993_of_match);
 246
 247 static struct i2c_driver mp2993_driver = {
 248         .driver = {
 249                 .name = "mp2993",
 250                 .of_match_table = mp2993_of_match,
 251         },
 252         .probe = mp2993_probe,
 253         .id_table = mp2993_id,
 254 };
 255
 256 module_i2c_driver(mp2993_driver);
 257
 258 MODULE_AUTHOR("Noah Wang <noahwang.wang@outlook.com>");
 259 MODULE_DESCRIPTION("PMBus driver for MPS MP2993");
 260 MODULE_LICENSE("GPL");
 261 MODULE_IMPORT_NS(PMBUS);