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 const struct i2c_device_id ds1200_id[] = { 152 {"ds1200", 0}, 153 {} 154 }; 155 156 MODULE_DEVICE_TABLE(i2c, ds1200_id); 157 158 /* This is the driver that will be inserted */ 159 static struct i2c_driver ds1200_driver = { 160 .driver = { 161 .name = "ds1200", 162 }, 163 .probe_new = ds1200_probe, 164 .id_table = ds1200_id, 165 }; 166 167 static int __init ds1200_init(void) 168 { 169 return i2c_add_driver(&ds1200_driver); 170 } 171 172 static void __exit ds1200_exit(void) 173 { 174 i2c_del_driver(&ds1200_driver); 175 } 176 177 178Sysfs entries 179------------- 180 181When probing the chip, the driver identifies which PMBus registers are 182supported, and determines available sensors from this information. 183Attribute files only exist if respective sensors are supported by the chip. 184Labels are provided to inform the user about the sensor associated with 185a given sysfs entry. 186 187The following attributes are supported. Limits are read-write; all other 188attributes are read-only. 189 190======================= ======================================================== 191inX_input Measured voltage. From READ_VIN or READ_VOUT register. 192inX_min Minimum Voltage. 193 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 194inX_max Maximum voltage. 195 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 196inX_lcrit Critical minimum Voltage. 197 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 198inX_crit Critical maximum voltage. 199 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 200inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 201inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 202inX_lcrit_alarm Voltage critical low alarm. 203 From VOLTAGE_UV_FAULT status. 204inX_crit_alarm Voltage critical high alarm. 205 From VOLTAGE_OV_FAULT status. 206inX_label "vin", "vcap", or "voutY" 207inX_rated_min Minimum rated voltage. 208 From MFR_VIN_MIN or MFR_VOUT_MIN register. 209inX_rated_max Maximum rated voltage. 210 From MFR_VIN_MAX or MFR_VOUT_MAX register. 211 212currX_input Measured current. From READ_IIN or READ_IOUT register. 213currX_max Maximum current. 214 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 215currX_lcrit Critical minimum output current. 216 From IOUT_UC_FAULT_LIMIT register. 217currX_crit Critical maximum current. 218 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 219currX_alarm Current high alarm. 220 From IIN_OC_WARNING or IOUT_OC_WARNING status. 221currX_max_alarm Current high alarm. 222 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 223currX_lcrit_alarm Output current critical low alarm. 224 From IOUT_UC_FAULT status. 225currX_crit_alarm Current critical high alarm. 226 From IIN_OC_FAULT or IOUT_OC_FAULT status. 227currX_label "iin", "iinY", "iinY.Z", "ioutY", or "ioutY.Z", 228 where Y reflects the page number and Z reflects the 229 phase. 230currX_rated_max Maximum rated current. 231 From MFR_IIN_MAX or MFR_IOUT_MAX register. 232 233powerX_input Measured power. From READ_PIN or READ_POUT register. 234powerX_cap Output power cap. From POUT_MAX register. 235powerX_max Power limit. From PIN_OP_WARN_LIMIT or 236 POUT_OP_WARN_LIMIT register. 237powerX_crit Critical output power limit. 238 From POUT_OP_FAULT_LIMIT register. 239powerX_alarm Power high alarm. 240 From PIN_OP_WARNING or POUT_OP_WARNING status. 241powerX_crit_alarm Output power critical high alarm. 242 From POUT_OP_FAULT status. 243powerX_label "pin", "pinY", "pinY.Z", "poutY", or "poutY.Z", 244 where Y reflects the page number and Z reflects the 245 phase. 246powerX_rated_max Maximum rated power. 247 From MFR_PIN_MAX or MFR_POUT_MAX register. 248 249tempX_input Measured temperature. 250 From READ_TEMPERATURE_X register. 251tempX_min Minimum temperature. From UT_WARN_LIMIT register. 252tempX_max Maximum temperature. From OT_WARN_LIMIT register. 253tempX_lcrit Critical low temperature. 254 From UT_FAULT_LIMIT register. 255tempX_crit Critical high temperature. 256 From OT_FAULT_LIMIT register. 257tempX_min_alarm Chip temperature low alarm. Set by comparing 258 READ_TEMPERATURE_X with UT_WARN_LIMIT if 259 TEMP_UT_WARNING status is set. 260tempX_max_alarm Chip temperature high alarm. Set by comparing 261 READ_TEMPERATURE_X with OT_WARN_LIMIT if 262 TEMP_OT_WARNING status is set. 263tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 264 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 265 TEMP_UT_FAULT status is set. 266tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 267 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 268 TEMP_OT_FAULT status is set. 269tempX_rated_min Minimum rated temperature. 270 From MFR_TAMBIENT_MIN register. 271tempX_rated_max Maximum rated temperature. 272 From MFR_TAMBIENT_MAX, MFR_MAX_TEMP_1, MFR_MAX_TEMP_2 or 273 MFR_MAX_TEMP_3 register. 274======================= ======================================================== 275