1 /* 2 * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller 3 * and Digital Power Monitor 4 * 5 * Copyright (c) 2011 Ericsson AB. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/err.h> 22 #include <linux/slab.h> 23 #include <linux/i2c.h> 24 #include "pmbus.h" 25 26 enum chips { adm1075, adm1275, adm1276 }; 27 28 #define ADM1275_PEAK_IOUT 0xd0 29 #define ADM1275_PEAK_VIN 0xd1 30 #define ADM1275_PEAK_VOUT 0xd2 31 #define ADM1275_PMON_CONFIG 0xd4 32 33 #define ADM1275_VIN_VOUT_SELECT (1 << 6) 34 #define ADM1275_VRANGE (1 << 5) 35 #define ADM1075_IRANGE_50 (1 << 4) 36 #define ADM1075_IRANGE_25 (1 << 3) 37 #define ADM1075_IRANGE_MASK ((1 << 3) | (1 << 4)) 38 39 #define ADM1275_IOUT_WARN2_LIMIT 0xd7 40 #define ADM1275_DEVICE_CONFIG 0xd8 41 42 #define ADM1275_IOUT_WARN2_SELECT (1 << 4) 43 44 #define ADM1276_PEAK_PIN 0xda 45 46 #define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0) 47 48 #define ADM1075_READ_VAUX 0xdd 49 #define ADM1075_VAUX_OV_WARN_LIMIT 0xde 50 #define ADM1075_VAUX_UV_WARN_LIMIT 0xdf 51 #define ADM1075_VAUX_STATUS 0xf6 52 53 #define ADM1075_VAUX_OV_WARN (1<<7) 54 #define ADM1075_VAUX_UV_WARN (1<<6) 55 56 struct adm1275_data { 57 int id; 58 bool have_oc_fault; 59 struct pmbus_driver_info info; 60 }; 61 62 #define to_adm1275_data(x) container_of(x, struct adm1275_data, info) 63 64 static int adm1275_read_word_data(struct i2c_client *client, int page, int reg) 65 { 66 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 67 const struct adm1275_data *data = to_adm1275_data(info); 68 int ret = 0; 69 70 if (page) 71 return -ENXIO; 72 73 switch (reg) { 74 case PMBUS_IOUT_UC_FAULT_LIMIT: 75 if (data->have_oc_fault) { 76 ret = -ENXIO; 77 break; 78 } 79 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); 80 break; 81 case PMBUS_IOUT_OC_FAULT_LIMIT: 82 if (!data->have_oc_fault) { 83 ret = -ENXIO; 84 break; 85 } 86 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); 87 break; 88 case PMBUS_VOUT_OV_WARN_LIMIT: 89 if (data->id != adm1075) { 90 ret = -ENODATA; 91 break; 92 } 93 ret = pmbus_read_word_data(client, 0, 94 ADM1075_VAUX_OV_WARN_LIMIT); 95 break; 96 case PMBUS_VOUT_UV_WARN_LIMIT: 97 if (data->id != adm1075) { 98 ret = -ENODATA; 99 break; 100 } 101 ret = pmbus_read_word_data(client, 0, 102 ADM1075_VAUX_UV_WARN_LIMIT); 103 break; 104 case PMBUS_READ_VOUT: 105 if (data->id != adm1075) { 106 ret = -ENODATA; 107 break; 108 } 109 ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX); 110 break; 111 case PMBUS_VIRT_READ_IOUT_MAX: 112 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT); 113 break; 114 case PMBUS_VIRT_READ_VOUT_MAX: 115 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT); 116 break; 117 case PMBUS_VIRT_READ_VIN_MAX: 118 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN); 119 break; 120 case PMBUS_VIRT_READ_PIN_MAX: 121 if (data->id == adm1275) { 122 ret = -ENXIO; 123 break; 124 } 125 ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN); 126 break; 127 case PMBUS_VIRT_RESET_IOUT_HISTORY: 128 case PMBUS_VIRT_RESET_VOUT_HISTORY: 129 case PMBUS_VIRT_RESET_VIN_HISTORY: 130 break; 131 case PMBUS_VIRT_RESET_PIN_HISTORY: 132 if (data->id == adm1275) 133 ret = -ENXIO; 134 break; 135 default: 136 ret = -ENODATA; 137 break; 138 } 139 return ret; 140 } 141 142 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg, 143 u16 word) 144 { 145 int ret; 146 147 if (page) 148 return -ENXIO; 149 150 switch (reg) { 151 case PMBUS_IOUT_UC_FAULT_LIMIT: 152 case PMBUS_IOUT_OC_FAULT_LIMIT: 153 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT, 154 word); 155 break; 156 case PMBUS_VIRT_RESET_IOUT_HISTORY: 157 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0); 158 break; 159 case PMBUS_VIRT_RESET_VOUT_HISTORY: 160 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0); 161 break; 162 case PMBUS_VIRT_RESET_VIN_HISTORY: 163 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0); 164 break; 165 case PMBUS_VIRT_RESET_PIN_HISTORY: 166 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0); 167 break; 168 default: 169 ret = -ENODATA; 170 break; 171 } 172 return ret; 173 } 174 175 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg) 176 { 177 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 178 const struct adm1275_data *data = to_adm1275_data(info); 179 int mfr_status, ret; 180 181 if (page > 0) 182 return -ENXIO; 183 184 switch (reg) { 185 case PMBUS_STATUS_IOUT: 186 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT); 187 if (ret < 0) 188 break; 189 mfr_status = pmbus_read_byte_data(client, page, 190 PMBUS_STATUS_MFR_SPECIFIC); 191 if (mfr_status < 0) { 192 ret = mfr_status; 193 break; 194 } 195 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) { 196 ret |= data->have_oc_fault ? 197 PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT; 198 } 199 break; 200 case PMBUS_STATUS_VOUT: 201 if (data->id != adm1075) { 202 ret = -ENODATA; 203 break; 204 } 205 ret = 0; 206 mfr_status = pmbus_read_byte_data(client, 0, 207 ADM1075_VAUX_STATUS); 208 if (mfr_status & ADM1075_VAUX_OV_WARN) 209 ret |= PB_VOLTAGE_OV_WARNING; 210 if (mfr_status & ADM1075_VAUX_UV_WARN) 211 ret |= PB_VOLTAGE_UV_WARNING; 212 break; 213 default: 214 ret = -ENODATA; 215 break; 216 } 217 return ret; 218 } 219 220 static const struct i2c_device_id adm1275_id[] = { 221 { "adm1075", adm1075 }, 222 { "adm1275", adm1275 }, 223 { "adm1276", adm1276 }, 224 { } 225 }; 226 MODULE_DEVICE_TABLE(i2c, adm1275_id); 227 228 static int adm1275_probe(struct i2c_client *client, 229 const struct i2c_device_id *id) 230 { 231 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; 232 int config, device_config; 233 int ret; 234 struct pmbus_driver_info *info; 235 struct adm1275_data *data; 236 const struct i2c_device_id *mid; 237 238 if (!i2c_check_functionality(client->adapter, 239 I2C_FUNC_SMBUS_READ_BYTE_DATA 240 | I2C_FUNC_SMBUS_BLOCK_DATA)) 241 return -ENODEV; 242 243 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer); 244 if (ret < 0) { 245 dev_err(&client->dev, "Failed to read Manufacturer ID\n"); 246 return ret; 247 } 248 if (ret != 3 || strncmp(block_buffer, "ADI", 3)) { 249 dev_err(&client->dev, "Unsupported Manufacturer ID\n"); 250 return -ENODEV; 251 } 252 253 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer); 254 if (ret < 0) { 255 dev_err(&client->dev, "Failed to read Manufacturer Model\n"); 256 return ret; 257 } 258 for (mid = adm1275_id; mid->name[0]; mid++) { 259 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) 260 break; 261 } 262 if (!mid->name[0]) { 263 dev_err(&client->dev, "Unsupported device\n"); 264 return -ENODEV; 265 } 266 267 if (id->driver_data != mid->driver_data) 268 dev_notice(&client->dev, 269 "Device mismatch: Configured %s, detected %s\n", 270 id->name, mid->name); 271 272 config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG); 273 if (config < 0) 274 return config; 275 276 device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG); 277 if (device_config < 0) 278 return device_config; 279 280 data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data), 281 GFP_KERNEL); 282 if (!data) 283 return -ENOMEM; 284 285 data->id = mid->driver_data; 286 287 info = &data->info; 288 289 info->pages = 1; 290 info->format[PSC_VOLTAGE_IN] = direct; 291 info->format[PSC_VOLTAGE_OUT] = direct; 292 info->format[PSC_CURRENT_OUT] = direct; 293 info->m[PSC_CURRENT_OUT] = 807; 294 info->b[PSC_CURRENT_OUT] = 20475; 295 info->R[PSC_CURRENT_OUT] = -1; 296 info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; 297 298 info->read_word_data = adm1275_read_word_data; 299 info->read_byte_data = adm1275_read_byte_data; 300 info->write_word_data = adm1275_write_word_data; 301 302 if (data->id == adm1075) { 303 info->m[PSC_VOLTAGE_IN] = 27169; 304 info->b[PSC_VOLTAGE_IN] = 0; 305 info->R[PSC_VOLTAGE_IN] = -1; 306 info->m[PSC_VOLTAGE_OUT] = 27169; 307 info->b[PSC_VOLTAGE_OUT] = 0; 308 info->R[PSC_VOLTAGE_OUT] = -1; 309 } else if (config & ADM1275_VRANGE) { 310 info->m[PSC_VOLTAGE_IN] = 19199; 311 info->b[PSC_VOLTAGE_IN] = 0; 312 info->R[PSC_VOLTAGE_IN] = -2; 313 info->m[PSC_VOLTAGE_OUT] = 19199; 314 info->b[PSC_VOLTAGE_OUT] = 0; 315 info->R[PSC_VOLTAGE_OUT] = -2; 316 } else { 317 info->m[PSC_VOLTAGE_IN] = 6720; 318 info->b[PSC_VOLTAGE_IN] = 0; 319 info->R[PSC_VOLTAGE_IN] = -1; 320 info->m[PSC_VOLTAGE_OUT] = 6720; 321 info->b[PSC_VOLTAGE_OUT] = 0; 322 info->R[PSC_VOLTAGE_OUT] = -1; 323 } 324 325 if (device_config & ADM1275_IOUT_WARN2_SELECT) 326 data->have_oc_fault = true; 327 328 switch (data->id) { 329 case adm1075: 330 info->format[PSC_POWER] = direct; 331 info->b[PSC_POWER] = 0; 332 info->R[PSC_POWER] = -1; 333 switch (config & ADM1075_IRANGE_MASK) { 334 case ADM1075_IRANGE_25: 335 info->m[PSC_POWER] = 8549; 336 info->m[PSC_CURRENT_OUT] = 806; 337 break; 338 case ADM1075_IRANGE_50: 339 info->m[PSC_POWER] = 4279; 340 info->m[PSC_CURRENT_OUT] = 404; 341 break; 342 default: 343 dev_err(&client->dev, "Invalid input current range"); 344 info->m[PSC_POWER] = 0; 345 info->m[PSC_CURRENT_OUT] = 0; 346 break; 347 } 348 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN 349 | PMBUS_HAVE_STATUS_INPUT; 350 if (config & ADM1275_VIN_VOUT_SELECT) 351 info->func[0] |= 352 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 353 break; 354 case adm1275: 355 if (config & ADM1275_VIN_VOUT_SELECT) 356 info->func[0] |= 357 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 358 else 359 info->func[0] |= 360 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT; 361 break; 362 case adm1276: 363 info->format[PSC_POWER] = direct; 364 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN 365 | PMBUS_HAVE_STATUS_INPUT; 366 if (config & ADM1275_VIN_VOUT_SELECT) 367 info->func[0] |= 368 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 369 if (config & ADM1275_VRANGE) { 370 info->m[PSC_POWER] = 6043; 371 info->b[PSC_POWER] = 0; 372 info->R[PSC_POWER] = -2; 373 } else { 374 info->m[PSC_POWER] = 2115; 375 info->b[PSC_POWER] = 0; 376 info->R[PSC_POWER] = -1; 377 } 378 break; 379 } 380 381 return pmbus_do_probe(client, id, info); 382 } 383 384 static struct i2c_driver adm1275_driver = { 385 .driver = { 386 .name = "adm1275", 387 }, 388 .probe = adm1275_probe, 389 .remove = pmbus_do_remove, 390 .id_table = adm1275_id, 391 }; 392 393 module_i2c_driver(adm1275_driver); 394 395 MODULE_AUTHOR("Guenter Roeck"); 396 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles"); 397 MODULE_LICENSE("GPL"); 398