1Kernel driver pmbus 2=================== 3 4Supported chips: 5 6 * Ericsson BMR453, BMR454 7 8 Prefixes: 'bmr453', 'bmr454' 9 10 Addresses scanned: - 11 12 Datasheet: 13 14 http://archive.ericsson.net/service/internet/picov/get?DocNo=28701-EN/LZT146395 15 16 * ON Semiconductor ADP4000, NCP4200, NCP4208 17 18 Prefixes: 'adp4000', 'ncp4200', 'ncp4208' 19 20 Addresses scanned: - 21 22 Datasheets: 23 24 https://www.onsemi.com/pub_link/Collateral/ADP4000-D.PDF 25 26 https://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF 27 28 https://www.onsemi.com/pub_link/Collateral/JUNE%202009-%20REV.%200.PDF 29 30 * Lineage Power 31 32 Prefixes: 'mdt040', 'pdt003', 'pdt006', 'pdt012', 'udt020' 33 34 Addresses scanned: - 35 36 Datasheets: 37 38 http://www.lineagepower.com/oem/pdf/PDT003A0X.pdf 39 40 http://www.lineagepower.com/oem/pdf/PDT006A0X.pdf 41 42 http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf 43 44 http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf 45 46 http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf 47 48 * Texas Instruments TPS40400, TPS544B20, TPS544B25, TPS544C20, TPS544C25 49 50 Prefixes: 'tps40400', 'tps544b20', 'tps544b25', 'tps544c20', 'tps544c25' 51 52 Addresses scanned: - 53 54 Datasheets: 55 56 https://www.ti.com/lit/gpn/tps40400 57 58 https://www.ti.com/lit/gpn/tps544b20 59 60 https://www.ti.com/lit/gpn/tps544b25 61 62 https://www.ti.com/lit/gpn/tps544c20 63 64 https://www.ti.com/lit/gpn/tps544c25 65 66 * Maxim MAX20796 67 68 Prefix: 'max20796' 69 70 Addresses scanned: - 71 72 Datasheet: 73 74 Not published 75 76 * Generic PMBus devices 77 78 Prefix: 'pmbus' 79 80 Addresses scanned: - 81 82 Datasheet: n.a. 83 84 85Author: Guenter Roeck <linux@roeck-us.net> 86 87 88Description 89----------- 90 91This driver supports hardware monitoring for various PMBus compliant devices. 92It supports voltage, current, power, and temperature sensors as supported 93by the device. 94 95Each monitored channel has its own high and low limits, plus a critical 96limit. 97 98Fan support will be added in a later version of this driver. 99 100 101Usage Notes 102----------- 103 104This driver does not probe for PMBus devices, since there is no register 105which can be safely used to identify the chip (The MFG_ID register is not 106supported by all chips), and since there is no well defined address range for 107PMBus devices. You will have to instantiate the devices explicitly. 108 109Example: the following will load the driver for an LTC2978 at address 0x60 110on I2C bus #1:: 111 112 $ modprobe pmbus 113 $ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 114 115 116Platform data support 117--------------------- 118 119Support for additional PMBus chips can be added by defining chip parameters in 120a new chip specific driver file. For example, (untested) code to add support for 121Emerson DS1200 power modules might look as follows:: 122 123 static struct pmbus_driver_info ds1200_info = { 124 .pages = 1, 125 /* Note: All other sensors are in linear mode */ 126 .direct[PSC_VOLTAGE_OUT] = true, 127 .direct[PSC_TEMPERATURE] = true, 128 .direct[PSC_CURRENT_OUT] = true, 129 .m[PSC_VOLTAGE_IN] = 1, 130 .b[PSC_VOLTAGE_IN] = 0, 131 .R[PSC_VOLTAGE_IN] = 3, 132 .m[PSC_VOLTAGE_OUT] = 1, 133 .b[PSC_VOLTAGE_OUT] = 0, 134 .R[PSC_VOLTAGE_OUT] = 3, 135 .m[PSC_TEMPERATURE] = 1, 136 .b[PSC_TEMPERATURE] = 0, 137 .R[PSC_TEMPERATURE] = 3, 138 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 139 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 140 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 141 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 142 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 143 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 144 }; 145 146 static int ds1200_probe(struct i2c_client *client) 147 { 148 return pmbus_do_probe(client, &ds1200_info); 149 } 150 151 static int ds1200_remove(struct i2c_client *client) 152 { 153 return pmbus_do_remove(client); 154 } 155 156 static const struct i2c_device_id ds1200_id[] = { 157 {"ds1200", 0}, 158 {} 159 }; 160 161 MODULE_DEVICE_TABLE(i2c, ds1200_id); 162 163 /* This is the driver that will be inserted */ 164 static struct i2c_driver ds1200_driver = { 165 .driver = { 166 .name = "ds1200", 167 }, 168 .probe_new = ds1200_probe, 169 .remove = ds1200_remove, 170 .id_table = ds1200_id, 171 }; 172 173 static int __init ds1200_init(void) 174 { 175 return i2c_add_driver(&ds1200_driver); 176 } 177 178 static void __exit ds1200_exit(void) 179 { 180 i2c_del_driver(&ds1200_driver); 181 } 182 183 184Sysfs entries 185------------- 186 187When probing the chip, the driver identifies which PMBus registers are 188supported, and determines available sensors from this information. 189Attribute files only exist if respective sensors are supported by the chip. 190Labels are provided to inform the user about the sensor associated with 191a given sysfs entry. 192 193The following attributes are supported. Limits are read-write; all other 194attributes are read-only. 195 196======================= ======================================================== 197inX_input Measured voltage. From READ_VIN or READ_VOUT register. 198inX_min Minimum Voltage. 199 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 200inX_max Maximum voltage. 201 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 202inX_lcrit Critical minimum Voltage. 203 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 204inX_crit Critical maximum voltage. 205 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 206inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 207inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 208inX_lcrit_alarm Voltage critical low alarm. 209 From VOLTAGE_UV_FAULT status. 210inX_crit_alarm Voltage critical high alarm. 211 From VOLTAGE_OV_FAULT status. 212inX_label "vin", "vcap", or "voutY" 213inX_rated_min Minimum rated voltage. 214 From MFR_VIN_MIN or MFR_VOUT_MIN register. 215inX_rated_max Maximum rated voltage. 216 From MFR_VIN_MAX or MFR_VOUT_MAX register. 217 218currX_input Measured current. From READ_IIN or READ_IOUT register. 219currX_max Maximum current. 220 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 221currX_lcrit Critical minimum output current. 222 From IOUT_UC_FAULT_LIMIT register. 223currX_crit Critical maximum current. 224 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 225currX_alarm Current high alarm. 226 From IIN_OC_WARNING or IOUT_OC_WARNING status. 227currX_max_alarm Current high alarm. 228 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 229currX_lcrit_alarm Output current critical low alarm. 230 From IOUT_UC_FAULT status. 231currX_crit_alarm Current critical high alarm. 232 From IIN_OC_FAULT or IOUT_OC_FAULT status. 233currX_label "iin", "iinY", "iinY.Z", "ioutY", or "ioutY.Z", 234 where Y reflects the page number and Z reflects the 235 phase. 236currX_rated_max Maximum rated current. 237 From MFR_IIN_MAX or MFR_IOUT_MAX register. 238 239powerX_input Measured power. From READ_PIN or READ_POUT register. 240powerX_cap Output power cap. From POUT_MAX register. 241powerX_max Power limit. From PIN_OP_WARN_LIMIT or 242 POUT_OP_WARN_LIMIT register. 243powerX_crit Critical output power limit. 244 From POUT_OP_FAULT_LIMIT register. 245powerX_alarm Power high alarm. 246 From PIN_OP_WARNING or POUT_OP_WARNING status. 247powerX_crit_alarm Output power critical high alarm. 248 From POUT_OP_FAULT status. 249powerX_label "pin", "pinY", "pinY.Z", "poutY", or "poutY.Z", 250 where Y reflects the page number and Z reflects the 251 phase. 252powerX_rated_max Maximum rated power. 253 From MFR_PIN_MAX or MFR_POUT_MAX register. 254 255tempX_input Measured temperature. 256 From READ_TEMPERATURE_X register. 257tempX_min Minimum temperature. From UT_WARN_LIMIT register. 258tempX_max Maximum temperature. From OT_WARN_LIMIT register. 259tempX_lcrit Critical low temperature. 260 From UT_FAULT_LIMIT register. 261tempX_crit Critical high temperature. 262 From OT_FAULT_LIMIT register. 263tempX_min_alarm Chip temperature low alarm. Set by comparing 264 READ_TEMPERATURE_X with UT_WARN_LIMIT if 265 TEMP_UT_WARNING status is set. 266tempX_max_alarm Chip temperature high alarm. Set by comparing 267 READ_TEMPERATURE_X with OT_WARN_LIMIT if 268 TEMP_OT_WARNING status is set. 269tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 270 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 271 TEMP_UT_FAULT status is set. 272tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 273 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 274 TEMP_OT_FAULT status is set. 275tempX_rated_min Minimum rated temperature. 276 From MFR_TAMBIENT_MIN register. 277tempX_rated_max Maximum rated temperature. 278 From MFR_TAMBIENT_MAX, MFR_MAX_TEMP_1, MFR_MAX_TEMP_2 or 279 MFR_MAX_TEMP_3 register. 280======================= ======================================================== 281