drivers/hwmon/pmbus/pim4328.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for PIM4006, PIM4328 and PIM4820
   4  *
   5  * Copyright (c) 2021 Flextronics International Sweden AB
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/i2c.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/pmbus.h>
  14 #include <linux/slab.h>
  15 #include "pmbus.h"
  16
  17 enum chips { pim4006, pim4328, pim4820 };
  18
  19 struct pim4328_data {
  20         enum chips id;
  21         struct pmbus_driver_info info;
  22 };
  23
  24 #define to_pim4328_data(x)  container_of(x, struct pim4328_data, info)
  25
  26 /* PIM4006 and PIM4328 */
  27 #define PIM4328_MFR_READ_VINA           0xd3
  28 #define PIM4328_MFR_READ_VINB           0xd4
  29
  30 /* PIM4006 */
  31 #define PIM4328_MFR_READ_IINA           0xd6
  32 #define PIM4328_MFR_READ_IINB           0xd7
  33 #define PIM4328_MFR_FET_CHECKSTATUS     0xd9
  34
  35 /* PIM4328 */
  36 #define PIM4328_MFR_STATUS_BITS         0xd5
  37
  38 /* PIM4820 */
  39 #define PIM4328_MFR_READ_STATUS         0xd0
  40
  41 static const struct i2c_device_id pim4328_id[] = {
  42         {"bmr455", pim4328},
  43         {"pim4006", pim4006},
  44         {"pim4106", pim4006},
  45         {"pim4206", pim4006},
  46         {"pim4306", pim4006},
  47         {"pim4328", pim4328},
  48         {"pim4406", pim4006},
  49         {"pim4820", pim4820},
  50         {}
  51 };
  52 MODULE_DEVICE_TABLE(i2c, pim4328_id);
  53
  54 static int pim4328_read_word_data(struct i2c_client *client, int page,
  55                                   int phase, int reg)
  56 {
  57         int ret;
  58
  59         if (page > 0)
  60                 return -ENXIO;
  61
  62         if (phase == 0xff)
  63                 return -ENODATA;
  64
  65         switch (reg) {
  66         case PMBUS_READ_VIN:
  67                 ret = pmbus_read_word_data(client, page, phase,
  68                                            phase == 0 ? PIM4328_MFR_READ_VINA
  69                                                       : PIM4328_MFR_READ_VINB);
  70                 break;
  71         case PMBUS_READ_IIN:
  72                 ret = pmbus_read_word_data(client, page, phase,
  73                                            phase == 0 ? PIM4328_MFR_READ_IINA
  74                                                       : PIM4328_MFR_READ_IINB);
  75                 break;
  76         default:
  77                 ret = -ENODATA;
  78         }
  79
  80         return ret;
  81 }
  82
  83 static int pim4328_read_byte_data(struct i2c_client *client, int page, int reg)
  84 {
  85         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  86         struct pim4328_data *data = to_pim4328_data(info);
  87         int ret, status;
  88
  89         if (page > 0)
  90                 return -ENXIO;
  91
  92         switch (reg) {
  93         case PMBUS_STATUS_BYTE:
  94                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
  95                 if (ret < 0)
  96                         return ret;
  97                 if (data->id == pim4006) {
  98                         status = pmbus_read_word_data(client, page, 0xff,
  99                                                       PIM4328_MFR_FET_CHECKSTATUS);
 100                         if (status < 0)
 101                                 return status;
 102                         if (status & 0x0630) /* Input UV */
 103                                 ret |= PB_STATUS_VIN_UV;
 104                 } else if (data->id == pim4328) {
 105                         status = pmbus_read_byte_data(client, page,
 106                                                       PIM4328_MFR_STATUS_BITS);
 107                         if (status < 0)
 108                                 return status;
 109                         if (status & 0x04) /* Input UV */
 110                                 ret |= PB_STATUS_VIN_UV;
 111                         if (status & 0x40) /* Output UV */
 112                                 ret |= PB_STATUS_NONE_ABOVE;
 113                 } else if (data->id == pim4820) {
 114                         status = pmbus_read_byte_data(client, page,
 115                                                       PIM4328_MFR_READ_STATUS);
 116                         if (status < 0)
 117                                 return status;
 118                         if (status & 0x05) /* Input OV or OC */
 119                                 ret |= PB_STATUS_NONE_ABOVE;
 120                         if (status & 0x1a) /* Input UV */
 121                                 ret |= PB_STATUS_VIN_UV;
 122                         if (status & 0x40) /* OT */
 123                                 ret |= PB_STATUS_TEMPERATURE;
 124                 }
 125                 break;
 126         default:
 127                 ret = -ENODATA;
 128         }
 129
 130         return ret;
 131 }
 132
 133 static int pim4328_probe(struct i2c_client *client)
 134 {
 135         int status;
 136         u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
 137         const struct i2c_device_id *mid;
 138         struct pim4328_data *data;
 139         struct pmbus_driver_info *info;
 140         struct pmbus_platform_data *pdata;
 141         struct device *dev = &client->dev;
 142
 143         if (!i2c_check_functionality(client->adapter,
 144                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
 145                                      | I2C_FUNC_SMBUS_BLOCK_DATA))
 146                 return -ENODEV;
 147
 148         data = devm_kzalloc(&client->dev, sizeof(struct pim4328_data),
 149                             GFP_KERNEL);
 150         if (!data)
 151                 return -ENOMEM;
 152
 153         status = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, device_id);
 154         if (status < 0) {
 155                 dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 156                 return status;
 157         }
 158         for (mid = pim4328_id; mid->name[0]; mid++) {
 159                 if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
 160                         break;
 161         }
 162         if (!mid->name[0]) {
 163                 dev_err(&client->dev, "Unsupported device\n");
 164                 return -ENODEV;
 165         }
 166
 167         if (strcmp(client->name, mid->name))
 168                 dev_notice(&client->dev,
 169                            "Device mismatch: Configured %s, detected %s\n",
 170                            client->name, mid->name);
 171
 172         data->id = mid->driver_data;
 173         info = &data->info;
 174         info->pages = 1;
 175         info->read_byte_data = pim4328_read_byte_data;
 176         info->read_word_data = pim4328_read_word_data;
 177
 178         pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
 179                              GFP_KERNEL);
 180         if (!pdata)
 181                 return -ENOMEM;
 182         dev->platform_data = pdata;
 183         pdata->flags = PMBUS_NO_CAPABILITY | PMBUS_NO_WRITE_PROTECT;
 184
 185         switch (data->id) {
 186         case pim4006:
 187                 info->phases[0] = 2;
 188                 info->func[0] = PMBUS_PHASE_VIRTUAL | PMBUS_HAVE_VIN
 189                         | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
 190                 info->pfunc[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
 191                 info->pfunc[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
 192                 break;
 193         case pim4328:
 194                 info->phases[0] = 2;
 195                 info->func[0] = PMBUS_PHASE_VIRTUAL
 196                         | PMBUS_HAVE_VCAP | PMBUS_HAVE_VIN
 197                         | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
 198                 info->pfunc[0] = PMBUS_HAVE_VIN;
 199                 info->pfunc[1] = PMBUS_HAVE_VIN;
 200                 info->format[PSC_VOLTAGE_IN] = direct;
 201                 info->format[PSC_TEMPERATURE] = direct;
 202                 info->format[PSC_CURRENT_OUT] = direct;
 203                 pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
 204                 break;
 205         case pim4820:
 206                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_TEMP
 207                         | PMBUS_HAVE_IIN;
 208                 info->format[PSC_VOLTAGE_IN] = direct;
 209                 info->format[PSC_TEMPERATURE] = direct;
 210                 info->format[PSC_CURRENT_IN] = direct;
 211                 pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
 212                 break;
 213         default:
 214                 return -ENODEV;
 215         }
 216
 217         return pmbus_do_probe(client, info);
 218 }
 219
 220 static struct i2c_driver pim4328_driver = {
 221         .driver = {
 222                    .name = "pim4328",
 223                    },
 224         .probe_new = pim4328_probe,
 225         .id_table = pim4328_id,
 226 };
 227
 228 module_i2c_driver(pim4328_driver);
 229
 230 MODULE_AUTHOR("Erik Rosen <erik.rosen@metormote.com>");
 231 MODULE_DESCRIPTION("PMBus driver for PIM4006, PIM4328, PIM4820 power interface modules");
 232 MODULE_LICENSE("GPL");
 233 MODULE_IMPORT_NS(PMBUS);