drivers/hwmon/pmbus/zl6100.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for ZL6100 and compatibles
   4  *
   5  * Copyright (c) 2011 Ericsson AB.
   6  * Copyright (c) 2012 Guenter Roeck
   7  */
   8
   9 #include <linux/bitops.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/i2c.h>
  16 #include <linux/ktime.h>
  17 #include <linux/delay.h>
  18 #include "pmbus.h"
  19
  20 enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
  21              zl8802, zl9101, zl9117, zls1003, zls4009 };
  22
  23 struct zl6100_data {
  24         int id;
  25         struct pmbus_driver_info info;
  26 };
  27
  28 #define to_zl6100_data(x)  container_of(x, struct zl6100_data, info)
  29
  30 #define ZL6100_MFR_CONFIG               0xd0
  31 #define ZL6100_DEVICE_ID                0xe4
  32
  33 #define ZL6100_MFR_XTEMP_ENABLE         BIT(7)
  34
  35 #define ZL8802_MFR_USER_GLOBAL_CONFIG   0xe9
  36 #define ZL8802_MFR_TMON_ENABLE          BIT(12)
  37 #define ZL8802_MFR_USER_CONFIG          0xd1
  38 #define ZL8802_MFR_XTEMP_ENABLE_2       BIT(1)
  39 #define ZL8802_MFR_DDC_CONFIG           0xd3
  40 #define ZL8802_MFR_PHASES_MASK          0x0007
  41
  42 #define MFR_VMON_OV_FAULT_LIMIT         0xf5
  43 #define MFR_VMON_UV_FAULT_LIMIT         0xf6
  44 #define MFR_READ_VMON                   0xf7
  45
  46 #define VMON_UV_WARNING                 BIT(5)
  47 #define VMON_OV_WARNING                 BIT(4)
  48 #define VMON_UV_FAULT                   BIT(1)
  49 #define VMON_OV_FAULT                   BIT(0)
  50
  51 #define ZL6100_WAIT_TIME                1000    /* uS   */
  52
  53 static ushort delay = ZL6100_WAIT_TIME;
  54 module_param(delay, ushort, 0644);
  55 MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
  56
  57 /* Convert linear sensor value to milli-units */
  58 static long zl6100_l2d(s16 l)
  59 {
  60         s16 exponent;
  61         s32 mantissa;
  62         long val;
  63
  64         exponent = l >> 11;
  65         mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
  66
  67         val = mantissa;
  68
  69         /* scale result to milli-units */
  70         val = val * 1000L;
  71
  72         if (exponent >= 0)
  73                 val <<= exponent;
  74         else
  75                 val >>= -exponent;
  76
  77         return val;
  78 }
  79
  80 #define MAX_MANTISSA    (1023 * 1000)
  81 #define MIN_MANTISSA    (511 * 1000)
  82
  83 static u16 zl6100_d2l(long val)
  84 {
  85         s16 exponent = 0, mantissa;
  86         bool negative = false;
  87
  88         /* simple case */
  89         if (val == 0)
  90                 return 0;
  91
  92         if (val < 0) {
  93                 negative = true;
  94                 val = -val;
  95         }
  96
  97         /* Reduce large mantissa until it fits into 10 bit */
  98         while (val >= MAX_MANTISSA && exponent < 15) {
  99                 exponent++;
 100                 val >>= 1;
 101         }
 102         /* Increase small mantissa to improve precision */
 103         while (val < MIN_MANTISSA && exponent > -15) {
 104                 exponent--;
 105                 val <<= 1;
 106         }
 107
 108         /* Convert mantissa from milli-units to units */
 109         mantissa = DIV_ROUND_CLOSEST(val, 1000);
 110
 111         /* Ensure that resulting number is within range */
 112         if (mantissa > 0x3ff)
 113                 mantissa = 0x3ff;
 114
 115         /* restore sign */
 116         if (negative)
 117                 mantissa = -mantissa;
 118
 119         /* Convert to 5 bit exponent, 11 bit mantissa */
 120         return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
 121 }
 122
 123 static int zl6100_read_word_data(struct i2c_client *client, int page,
 124                                  int phase, int reg)
 125 {
 126         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 127         struct zl6100_data *data = to_zl6100_data(info);
 128         int ret, vreg;
 129
 130         if (page >= info->pages)
 131                 return -ENXIO;
 132
 133         if (data->id == zl2005) {
 134                 /*
 135                  * Limit register detection is not reliable on ZL2005.
 136                  * Make sure registers are not erroneously detected.
 137                  */
 138                 switch (reg) {
 139                 case PMBUS_VOUT_OV_WARN_LIMIT:
 140                 case PMBUS_VOUT_UV_WARN_LIMIT:
 141                 case PMBUS_IOUT_OC_WARN_LIMIT:
 142                         return -ENXIO;
 143                 }
 144         }
 145
 146         switch (reg) {
 147         case PMBUS_VIRT_READ_VMON:
 148                 vreg = MFR_READ_VMON;
 149                 break;
 150         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 151         case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
 152                 vreg = MFR_VMON_OV_FAULT_LIMIT;
 153                 break;
 154         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 155         case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
 156                 vreg = MFR_VMON_UV_FAULT_LIMIT;
 157                 break;
 158         default:
 159                 if (reg >= PMBUS_VIRT_BASE)
 160                         return -ENXIO;
 161                 vreg = reg;
 162                 break;
 163         }
 164
 165         ret = pmbus_read_word_data(client, page, phase, vreg);
 166         if (ret < 0)
 167                 return ret;
 168
 169         switch (reg) {
 170         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 171                 ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
 172                 break;
 173         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 174                 ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
 175                 break;
 176         }
 177
 178         return ret;
 179 }
 180
 181 static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
 182 {
 183         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 184         int ret, status;
 185
 186         if (page >= info->pages)
 187                 return -ENXIO;
 188
 189         switch (reg) {
 190         case PMBUS_VIRT_STATUS_VMON:
 191                 ret = pmbus_read_byte_data(client, 0,
 192                                            PMBUS_STATUS_MFR_SPECIFIC);
 193                 if (ret < 0)
 194                         break;
 195
 196                 status = 0;
 197                 if (ret & VMON_UV_WARNING)
 198                         status |= PB_VOLTAGE_UV_WARNING;
 199                 if (ret & VMON_OV_WARNING)
 200                         status |= PB_VOLTAGE_OV_WARNING;
 201                 if (ret & VMON_UV_FAULT)
 202                         status |= PB_VOLTAGE_UV_FAULT;
 203                 if (ret & VMON_OV_FAULT)
 204                         status |= PB_VOLTAGE_OV_FAULT;
 205                 ret = status;
 206                 break;
 207         default:
 208                 ret = pmbus_read_byte_data(client, page, reg);
 209                 break;
 210         }
 211
 212         return ret;
 213 }
 214
 215 static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
 216                                   u16 word)
 217 {
 218         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 219         int vreg;
 220
 221         if (page >= info->pages)
 222                 return -ENXIO;
 223
 224         switch (reg) {
 225         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 226                 word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
 227                 vreg = MFR_VMON_OV_FAULT_LIMIT;
 228                 pmbus_clear_cache(client);
 229                 break;
 230         case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
 231                 vreg = MFR_VMON_OV_FAULT_LIMIT;
 232                 pmbus_clear_cache(client);
 233                 break;
 234         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 235                 word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
 236                 vreg = MFR_VMON_UV_FAULT_LIMIT;
 237                 pmbus_clear_cache(client);
 238                 break;
 239         case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
 240                 vreg = MFR_VMON_UV_FAULT_LIMIT;
 241                 pmbus_clear_cache(client);
 242                 break;
 243         default:
 244                 if (reg >= PMBUS_VIRT_BASE)
 245                         return -ENXIO;
 246                 vreg = reg;
 247         }
 248
 249         return pmbus_write_word_data(client, page, vreg, word);
 250 }
 251
 252 static const struct i2c_device_id zl6100_id[] = {
 253         {"bmr450", zl2005},
 254         {"bmr451", zl2005},
 255         {"bmr462", zl2008},
 256         {"bmr463", zl2008},
 257         {"bmr464", zl2008},
 258         {"bmr465", zls4009},
 259         {"bmr466", zls1003},
 260         {"bmr467", zls4009},
 261         {"bmr469", zl8802},
 262         {"zl2004", zl2004},
 263         {"zl2005", zl2005},
 264         {"zl2006", zl2006},
 265         {"zl2008", zl2008},
 266         {"zl2105", zl2105},
 267         {"zl2106", zl2106},
 268         {"zl6100", zl6100},
 269         {"zl6105", zl6105},
 270         {"zl8802", zl8802},
 271         {"zl9101", zl9101},
 272         {"zl9117", zl9117},
 273         {"zls1003", zls1003},
 274         {"zls4009", zls4009},
 275         { }
 276 };
 277 MODULE_DEVICE_TABLE(i2c, zl6100_id);
 278
 279 static int zl6100_probe(struct i2c_client *client)
 280 {
 281         int ret, i;
 282         struct zl6100_data *data;
 283         struct pmbus_driver_info *info;
 284         u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
 285         const struct i2c_device_id *mid;
 286
 287         if (!i2c_check_functionality(client->adapter,
 288                                      I2C_FUNC_SMBUS_READ_WORD_DATA
 289                                      | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
 290                 return -ENODEV;
 291
 292         ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
 293                                         device_id);
 294         if (ret < 0) {
 295                 dev_err(&client->dev, "Failed to read device ID\n");
 296                 return ret;
 297         }
 298         device_id[ret] = '\0';
 299         dev_info(&client->dev, "Device ID %s\n", device_id);
 300
 301         mid = NULL;
 302         for (mid = zl6100_id; mid->name[0]; mid++) {
 303                 if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
 304                         break;
 305         }
 306         if (!mid->name[0]) {
 307                 dev_err(&client->dev, "Unsupported device\n");
 308                 return -ENODEV;
 309         }
 310         if (strcmp(client->name, mid->name) != 0)
 311                 dev_notice(&client->dev,
 312                            "Device mismatch: Configured %s, detected %s\n",
 313                            client->name, mid->name);
 314
 315         data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
 316                             GFP_KERNEL);
 317         if (!data)
 318                 return -ENOMEM;
 319
 320         data->id = mid->driver_data;
 321
 322         /*
 323          * According to information from the chip vendor, all currently
 324          * supported chips are known to require a wait time between I2C
 325          * accesses.
 326          */
 327         udelay(delay);
 328
 329         info = &data->info;
 330
 331         info->pages = 1;
 332         info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 333           | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 334           | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 335           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 336
 337         /*
 338          * ZL2004, ZL8802, ZL9101M, ZL9117M and ZLS4009 support monitoring
 339          * an extra voltage (VMON for ZL2004, ZL8802 and ZLS4009,
 340          * VDRV for ZL9101M and ZL9117M). Report it as vmon.
 341          */
 342         if (data->id == zl2004 || data->id == zl8802 || data->id == zl9101 ||
 343             data->id == zl9117 || data->id == zls4009)
 344                 info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;
 345
 346         /*
 347          * ZL8802 has two outputs that can be used either independently or in
 348          * a current sharing configuration. The driver uses the DDC_CONFIG
 349          * register to check if the module is running with independent or
 350          * shared outputs. If the module is in shared output mode, only one
 351          * output voltage will be reported.
 352          */
 353         if (data->id == zl8802) {
 354                 info->pages = 2;
 355                 info->func[0] |= PMBUS_HAVE_IIN;
 356
 357                 ret = i2c_smbus_read_word_data(client, ZL8802_MFR_DDC_CONFIG);
 358                 if (ret < 0)
 359                         return ret;
 360
 361                 udelay(delay);
 362
 363                 if (ret & ZL8802_MFR_PHASES_MASK)
 364                         info->func[1] |= PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
 365                 else
 366                         info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 367                                 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
 368
 369                 for (i = 0; i < 2; i++) {
 370                         ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
 371                         if (ret < 0)
 372                                 return ret;
 373
 374                         udelay(delay);
 375
 376                         ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_CONFIG);
 377                         if (ret < 0)
 378                                 return ret;
 379
 380                         if (ret & ZL8802_MFR_XTEMP_ENABLE_2)
 381                                 info->func[i] |= PMBUS_HAVE_TEMP2;
 382
 383                         udelay(delay);
 384                 }
 385                 ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_GLOBAL_CONFIG);
 386                 if (ret < 0)
 387                         return ret;
 388
 389                 if (ret & ZL8802_MFR_TMON_ENABLE)
 390                         info->func[0] |= PMBUS_HAVE_TEMP3;
 391         } else {
 392                 ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
 393                 if (ret < 0)
 394                         return ret;
 395
 396                 if (ret & ZL6100_MFR_XTEMP_ENABLE)
 397                         info->func[0] |= PMBUS_HAVE_TEMP2;
 398         }
 399
 400         udelay(delay);
 401
 402         info->access_delay = delay;
 403         info->read_word_data = zl6100_read_word_data;
 404         info->read_byte_data = zl6100_read_byte_data;
 405         info->write_word_data = zl6100_write_word_data;
 406
 407         return pmbus_do_probe(client, info);
 408 }
 409
 410 static struct i2c_driver zl6100_driver = {
 411         .driver = {
 412                    .name = "zl6100",
 413                    },
 414         .probe = zl6100_probe,
 415         .id_table = zl6100_id,
 416 };
 417
 418 module_i2c_driver(zl6100_driver);
 419
 420 MODULE_AUTHOR("Guenter Roeck");
 421 MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
 422 MODULE_LICENSE("GPL");
 423 MODULE_IMPORT_NS(PMBUS);