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 http://www.onsemi.com/pub_link/Collateral/ADP4000-D.PDF 25 26 http://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF 27 28 http://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 http://www.ti.com/lit/gpn/tps40400 57 58 http://www.ti.com/lit/gpn/tps544b20 59 60 http://www.ti.com/lit/gpn/tps544b25 61 62 http://www.ti.com/lit/gpn/tps544c20 63 64 http://www.ti.com/lit/gpn/tps544c25 65 66 * Generic PMBus devices 67 68 Prefix: 'pmbus' 69 70 Addresses scanned: - 71 72 Datasheet: n.a. 73 74 75Author: Guenter Roeck <linux@roeck-us.net> 76 77 78Description 79----------- 80 81This driver supports hardware monitoring for various PMBus compliant devices. 82It supports voltage, current, power, and temperature sensors as supported 83by the device. 84 85Each monitored channel has its own high and low limits, plus a critical 86limit. 87 88Fan support will be added in a later version of this driver. 89 90 91Usage Notes 92----------- 93 94This driver does not probe for PMBus devices, since there is no register 95which can be safely used to identify the chip (The MFG_ID register is not 96supported by all chips), and since there is no well defined address range for 97PMBus devices. You will have to instantiate the devices explicitly. 98 99Example: the following will load the driver for an LTC2978 at address 0x60 100on I2C bus #1:: 101 102 $ modprobe pmbus 103 $ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 104 105 106Platform data support 107--------------------- 108 109Support for additional PMBus chips can be added by defining chip parameters in 110a new chip specific driver file. For example, (untested) code to add support for 111Emerson DS1200 power modules might look as follows:: 112 113 static struct pmbus_driver_info ds1200_info = { 114 .pages = 1, 115 /* Note: All other sensors are in linear mode */ 116 .direct[PSC_VOLTAGE_OUT] = true, 117 .direct[PSC_TEMPERATURE] = true, 118 .direct[PSC_CURRENT_OUT] = true, 119 .m[PSC_VOLTAGE_IN] = 1, 120 .b[PSC_VOLTAGE_IN] = 0, 121 .R[PSC_VOLTAGE_IN] = 3, 122 .m[PSC_VOLTAGE_OUT] = 1, 123 .b[PSC_VOLTAGE_OUT] = 0, 124 .R[PSC_VOLTAGE_OUT] = 3, 125 .m[PSC_TEMPERATURE] = 1, 126 .b[PSC_TEMPERATURE] = 0, 127 .R[PSC_TEMPERATURE] = 3, 128 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 129 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 130 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 131 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 132 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 133 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 134 }; 135 136 static int ds1200_probe(struct i2c_client *client, 137 const struct i2c_device_id *id) 138 { 139 return pmbus_do_probe(client, id, &ds1200_info); 140 } 141 142 static int ds1200_remove(struct i2c_client *client) 143 { 144 return pmbus_do_remove(client); 145 } 146 147 static const struct i2c_device_id ds1200_id[] = { 148 {"ds1200", 0}, 149 {} 150 }; 151 152 MODULE_DEVICE_TABLE(i2c, ds1200_id); 153 154 /* This is the driver that will be inserted */ 155 static struct i2c_driver ds1200_driver = { 156 .driver = { 157 .name = "ds1200", 158 }, 159 .probe = ds1200_probe, 160 .remove = ds1200_remove, 161 .id_table = ds1200_id, 162 }; 163 164 static int __init ds1200_init(void) 165 { 166 return i2c_add_driver(&ds1200_driver); 167 } 168 169 static void __exit ds1200_exit(void) 170 { 171 i2c_del_driver(&ds1200_driver); 172 } 173 174 175Sysfs entries 176------------- 177 178When probing the chip, the driver identifies which PMBus registers are 179supported, and determines available sensors from this information. 180Attribute files only exist if respective sensors are supported by the chip. 181Labels are provided to inform the user about the sensor associated with 182a given sysfs entry. 183 184The following attributes are supported. Limits are read-write; all other 185attributes are read-only. 186 187======================= ======================================================== 188inX_input Measured voltage. From READ_VIN or READ_VOUT register. 189inX_min Minimum Voltage. 190 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 191inX_max Maximum voltage. 192 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 193inX_lcrit Critical minimum Voltage. 194 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 195inX_crit Critical maximum voltage. 196 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 197inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 198inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 199inX_lcrit_alarm Voltage critical low alarm. 200 From VOLTAGE_UV_FAULT status. 201inX_crit_alarm Voltage critical high alarm. 202 From VOLTAGE_OV_FAULT status. 203inX_label "vin", "vcap", or "voutY" 204 205currX_input Measured current. From READ_IIN or READ_IOUT register. 206currX_max Maximum current. 207 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 208currX_lcrit Critical minimum output current. 209 From IOUT_UC_FAULT_LIMIT register. 210currX_crit Critical maximum current. 211 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 212currX_alarm Current high alarm. 213 From IIN_OC_WARNING or IOUT_OC_WARNING status. 214currX_max_alarm Current high alarm. 215 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 216currX_lcrit_alarm Output current critical low alarm. 217 From IOUT_UC_FAULT status. 218currX_crit_alarm Current critical high alarm. 219 From IIN_OC_FAULT or IOUT_OC_FAULT status. 220currX_label "iin" or "ioutY" 221 222powerX_input Measured power. From READ_PIN or READ_POUT register. 223powerX_cap Output power cap. From POUT_MAX register. 224powerX_max Power limit. From PIN_OP_WARN_LIMIT or 225 POUT_OP_WARN_LIMIT register. 226powerX_crit Critical output power limit. 227 From POUT_OP_FAULT_LIMIT register. 228powerX_alarm Power high alarm. 229 From PIN_OP_WARNING or POUT_OP_WARNING status. 230powerX_crit_alarm Output power critical high alarm. 231 From POUT_OP_FAULT status. 232powerX_label "pin" or "poutY" 233 234tempX_input Measured temperature. 235 From READ_TEMPERATURE_X register. 236tempX_min Mimimum temperature. From UT_WARN_LIMIT register. 237tempX_max Maximum temperature. From OT_WARN_LIMIT register. 238tempX_lcrit Critical low temperature. 239 From UT_FAULT_LIMIT register. 240tempX_crit Critical high temperature. 241 From OT_FAULT_LIMIT register. 242tempX_min_alarm Chip temperature low alarm. Set by comparing 243 READ_TEMPERATURE_X with UT_WARN_LIMIT if 244 TEMP_UT_WARNING status is set. 245tempX_max_alarm Chip temperature high alarm. Set by comparing 246 READ_TEMPERATURE_X with OT_WARN_LIMIT if 247 TEMP_OT_WARNING status is set. 248tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 249 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 250 TEMP_UT_FAULT status is set. 251tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 252 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 253 TEMP_OT_FAULT status is set. 254======================= ======================================================== 255