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 * 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 const struct i2c_device_id *id) 148 { 149 return pmbus_do_probe(client, id, &ds1200_info); 150 } 151 152 static int ds1200_remove(struct i2c_client *client) 153 { 154 return pmbus_do_remove(client); 155 } 156 157 static const struct i2c_device_id ds1200_id[] = { 158 {"ds1200", 0}, 159 {} 160 }; 161 162 MODULE_DEVICE_TABLE(i2c, ds1200_id); 163 164 /* This is the driver that will be inserted */ 165 static struct i2c_driver ds1200_driver = { 166 .driver = { 167 .name = "ds1200", 168 }, 169 .probe = ds1200_probe, 170 .remove = ds1200_remove, 171 .id_table = ds1200_id, 172 }; 173 174 static int __init ds1200_init(void) 175 { 176 return i2c_add_driver(&ds1200_driver); 177 } 178 179 static void __exit ds1200_exit(void) 180 { 181 i2c_del_driver(&ds1200_driver); 182 } 183 184 185Sysfs entries 186------------- 187 188When probing the chip, the driver identifies which PMBus registers are 189supported, and determines available sensors from this information. 190Attribute files only exist if respective sensors are supported by the chip. 191Labels are provided to inform the user about the sensor associated with 192a given sysfs entry. 193 194The following attributes are supported. Limits are read-write; all other 195attributes are read-only. 196 197======================= ======================================================== 198inX_input Measured voltage. From READ_VIN or READ_VOUT register. 199inX_min Minimum Voltage. 200 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 201inX_max Maximum voltage. 202 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 203inX_lcrit Critical minimum Voltage. 204 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 205inX_crit Critical maximum voltage. 206 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 207inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 208inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 209inX_lcrit_alarm Voltage critical low alarm. 210 From VOLTAGE_UV_FAULT status. 211inX_crit_alarm Voltage critical high alarm. 212 From VOLTAGE_OV_FAULT status. 213inX_label "vin", "vcap", or "voutY" 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" or "ioutY" 231 232powerX_input Measured power. From READ_PIN or READ_POUT register. 233powerX_cap Output power cap. From POUT_MAX register. 234powerX_max Power limit. From PIN_OP_WARN_LIMIT or 235 POUT_OP_WARN_LIMIT register. 236powerX_crit Critical output power limit. 237 From POUT_OP_FAULT_LIMIT register. 238powerX_alarm Power high alarm. 239 From PIN_OP_WARNING or POUT_OP_WARNING status. 240powerX_crit_alarm Output power critical high alarm. 241 From POUT_OP_FAULT status. 242powerX_label "pin" or "poutY" 243 244tempX_input Measured temperature. 245 From READ_TEMPERATURE_X register. 246tempX_min Mimimum temperature. From UT_WARN_LIMIT register. 247tempX_max Maximum temperature. From OT_WARN_LIMIT register. 248tempX_lcrit Critical low temperature. 249 From UT_FAULT_LIMIT register. 250tempX_crit Critical high temperature. 251 From OT_FAULT_LIMIT register. 252tempX_min_alarm Chip temperature low alarm. Set by comparing 253 READ_TEMPERATURE_X with UT_WARN_LIMIT if 254 TEMP_UT_WARNING status is set. 255tempX_max_alarm Chip temperature high alarm. Set by comparing 256 READ_TEMPERATURE_X with OT_WARN_LIMIT if 257 TEMP_OT_WARNING status is set. 258tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 259 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 260 TEMP_UT_FAULT status is set. 261tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 262 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 263 TEMP_OT_FAULT status is set. 264======================= ======================================================== 265