1Kernel driver pmbus 2=================== 3 4Supported chips: 5 6 * Flex BMR310, BMR453, BMR454, BMR456, BMR457, BMR458, BMR480, 7 BMR490, BMR491, BMR492 8 9 Prefixes: 'bmr310', 'bmr453', 'bmr454', 'bmr456', 'bmr457', 'bmr458', 'bmr480', 10 'bmr490', 'bmr491', 'bmr492' 11 12 Addresses scanned: - 13 14 Datasheets: 15 16 https://flexpowermodules.com/products 17 18 19 * ON Semiconductor ADP4000, NCP4200, NCP4208 20 21 Prefixes: 'adp4000', 'ncp4200', 'ncp4208' 22 23 Addresses scanned: - 24 25 Datasheets: 26 27 https://www.onsemi.com/pub_link/Collateral/ADP4000-D.PDF 28 29 https://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF 30 31 https://www.onsemi.com/pub_link/Collateral/JUNE%202009-%20REV.%200.PDF 32 33 * Lineage Power 34 35 Prefixes: 'mdt040', 'pdt003', 'pdt006', 'pdt012', 'udt020' 36 37 Addresses scanned: - 38 39 Datasheets: 40 41 http://www.lineagepower.com/oem/pdf/PDT003A0X.pdf 42 43 http://www.lineagepower.com/oem/pdf/PDT006A0X.pdf 44 45 http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf 46 47 http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf 48 49 http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf 50 51 * Texas Instruments TPS40400, TPS544B20, TPS544B25, TPS544C20, TPS544C25 52 53 Prefixes: 'tps40400', 'tps544b20', 'tps544b25', 'tps544c20', 'tps544c25' 54 55 Addresses scanned: - 56 57 Datasheets: 58 59 https://www.ti.com/lit/gpn/tps40400 60 61 https://www.ti.com/lit/gpn/tps544b20 62 63 https://www.ti.com/lit/gpn/tps544b25 64 65 https://www.ti.com/lit/gpn/tps544c20 66 67 https://www.ti.com/lit/gpn/tps544c25 68 69 * Maxim MAX20796 70 71 Prefix: 'max20796' 72 73 Addresses scanned: - 74 75 Datasheet: 76 77 Not published 78 79 * Generic PMBus devices 80 81 Prefix: 'pmbus' 82 83 Addresses scanned: - 84 85 Datasheet: n.a. 86 87 88Author: Guenter Roeck <linux@roeck-us.net> 89 90 91Description 92----------- 93 94This driver supports hardware monitoring for various PMBus compliant devices. 95It supports voltage, current, power, and temperature sensors as supported 96by the device. 97 98Each monitored channel has its own high and low limits, plus a critical 99limit. 100 101Fan support will be added in a later version of this driver. 102 103 104Usage Notes 105----------- 106 107This driver does not probe for PMBus devices, since there is no register 108which can be safely used to identify the chip (The MFG_ID register is not 109supported by all chips), and since there is no well defined address range for 110PMBus devices. You will have to instantiate the devices explicitly. 111 112Example: the following will load the driver for an LTC2978 at address 0x60 113on I2C bus #1:: 114 115 $ modprobe pmbus 116 $ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 117 118 119Platform data support 120--------------------- 121 122Support for additional PMBus chips can be added by defining chip parameters in 123a new chip specific driver file. For example, (untested) code to add support for 124Emerson DS1200 power modules might look as follows:: 125 126 static struct pmbus_driver_info ds1200_info = { 127 .pages = 1, 128 /* Note: All other sensors are in linear mode */ 129 .direct[PSC_VOLTAGE_OUT] = true, 130 .direct[PSC_TEMPERATURE] = true, 131 .direct[PSC_CURRENT_OUT] = true, 132 .m[PSC_VOLTAGE_IN] = 1, 133 .b[PSC_VOLTAGE_IN] = 0, 134 .R[PSC_VOLTAGE_IN] = 3, 135 .m[PSC_VOLTAGE_OUT] = 1, 136 .b[PSC_VOLTAGE_OUT] = 0, 137 .R[PSC_VOLTAGE_OUT] = 3, 138 .m[PSC_TEMPERATURE] = 1, 139 .b[PSC_TEMPERATURE] = 0, 140 .R[PSC_TEMPERATURE] = 3, 141 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 142 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 143 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 144 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 145 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 146 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 147 }; 148 149 static int ds1200_probe(struct i2c_client *client) 150 { 151 return pmbus_do_probe(client, &ds1200_info); 152 } 153 154 static const struct i2c_device_id ds1200_id[] = { 155 {"ds1200", 0}, 156 {} 157 }; 158 159 MODULE_DEVICE_TABLE(i2c, ds1200_id); 160 161 /* This is the driver that will be inserted */ 162 static struct i2c_driver ds1200_driver = { 163 .driver = { 164 .name = "ds1200", 165 }, 166 .probe = ds1200_probe, 167 .id_table = ds1200_id, 168 }; 169 170 static int __init ds1200_init(void) 171 { 172 return i2c_add_driver(&ds1200_driver); 173 } 174 175 static void __exit ds1200_exit(void) 176 { 177 i2c_del_driver(&ds1200_driver); 178 } 179 180 181Sysfs entries 182------------- 183 184When probing the chip, the driver identifies which PMBus registers are 185supported, and determines available sensors from this information. 186Attribute files only exist if respective sensors are supported by the chip. 187Labels are provided to inform the user about the sensor associated with 188a given sysfs entry. 189 190The following attributes are supported. Limits are read-write; all other 191attributes are read-only. 192 193======================= ======================================================== 194inX_input Measured voltage. From READ_VIN or READ_VOUT register. 195inX_min Minimum Voltage. 196 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 197inX_max Maximum voltage. 198 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 199inX_lcrit Critical minimum Voltage. 200 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 201inX_crit Critical maximum voltage. 202 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 203inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 204inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 205inX_lcrit_alarm Voltage critical low alarm. 206 From VOLTAGE_UV_FAULT status. 207inX_crit_alarm Voltage critical high alarm. 208 From VOLTAGE_OV_FAULT status. 209inX_label "vin", "vcap", or "voutY" 210inX_rated_min Minimum rated voltage. 211 From MFR_VIN_MIN or MFR_VOUT_MIN register. 212inX_rated_max Maximum rated voltage. 213 From MFR_VIN_MAX or MFR_VOUT_MAX register. 214 215currX_input Measured current. From READ_IIN or READ_IOUT register. 216currX_max Maximum current. 217 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 218currX_lcrit Critical minimum output current. 219 From IOUT_UC_FAULT_LIMIT register. 220currX_crit Critical maximum current. 221 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 222currX_alarm Current high alarm. 223 From IIN_OC_WARNING or IOUT_OC_WARNING status. 224currX_max_alarm Current high alarm. 225 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 226currX_lcrit_alarm Output current critical low alarm. 227 From IOUT_UC_FAULT status. 228currX_crit_alarm Current critical high alarm. 229 From IIN_OC_FAULT or IOUT_OC_FAULT status. 230currX_label "iin", "iinY", "iinY.Z", "ioutY", or "ioutY.Z", 231 where Y reflects the page number and Z reflects the 232 phase. 233currX_rated_max Maximum rated current. 234 From MFR_IIN_MAX or MFR_IOUT_MAX register. 235 236powerX_input Measured power. From READ_PIN or READ_POUT register. 237powerX_cap Output power cap. From POUT_MAX register. 238powerX_max Power limit. From PIN_OP_WARN_LIMIT or 239 POUT_OP_WARN_LIMIT register. 240powerX_crit Critical output power limit. 241 From POUT_OP_FAULT_LIMIT register. 242powerX_alarm Power high alarm. 243 From PIN_OP_WARNING or POUT_OP_WARNING status. 244powerX_crit_alarm Output power critical high alarm. 245 From POUT_OP_FAULT status. 246powerX_label "pin", "pinY", "pinY.Z", "poutY", or "poutY.Z", 247 where Y reflects the page number and Z reflects the 248 phase. 249powerX_rated_max Maximum rated power. 250 From MFR_PIN_MAX or MFR_POUT_MAX register. 251 252tempX_input Measured temperature. 253 From READ_TEMPERATURE_X register. 254tempX_min Minimum temperature. From UT_WARN_LIMIT register. 255tempX_max Maximum temperature. From OT_WARN_LIMIT register. 256tempX_lcrit Critical low temperature. 257 From UT_FAULT_LIMIT register. 258tempX_crit Critical high temperature. 259 From OT_FAULT_LIMIT register. 260tempX_min_alarm Chip temperature low alarm. Set by comparing 261 READ_TEMPERATURE_X with UT_WARN_LIMIT if 262 TEMP_UT_WARNING status is set. 263tempX_max_alarm Chip temperature high alarm. Set by comparing 264 READ_TEMPERATURE_X with OT_WARN_LIMIT if 265 TEMP_OT_WARNING status is set. 266tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 267 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 268 TEMP_UT_FAULT status is set. 269tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 270 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 271 TEMP_OT_FAULT status is set. 272tempX_rated_min Minimum rated temperature. 273 From MFR_TAMBIENT_MIN register. 274tempX_rated_max Maximum rated temperature. 275 From MFR_TAMBIENT_MAX, MFR_MAX_TEMP_1, MFR_MAX_TEMP_2 or 276 MFR_MAX_TEMP_3 register. 277======================= ======================================================== 278