Based on kernel version 3.3. Page generated on 2012-03-23 21:32 EST.
1 Kernel driver pmbus 2 ==================== 3 4 Supported chips: 5 * Ericsson BMR453, BMR454 6 Prefixes: 'bmr453', 'bmr454' 7 Addresses scanned: - 8 Datasheet: 9 http://archive.ericsson.net/service/internet/picov/get?DocNo=28701-EN/LZT146395 10 * ON Semiconductor ADP4000, NCP4200, NCP4208 11 Prefixes: 'adp4000', 'ncp4200', 'ncp4208' 12 Addresses scanned: - 13 Datasheets: 14 http://www.onsemi.com/pub_link/Collateral/ADP4000-D.PDF 15 http://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF 16 http://www.onsemi.com/pub_link/Collateral/JUNE%202009-%20REV.%200.PDF 17 * Lineage Power 18 Prefixes: 'pdt003', 'pdt006', 'pdt012', 'udt020' 19 Addresses scanned: - 20 Datasheets: 21 http://www.lineagepower.com/oem/pdf/PDT003A0X.pdf 22 http://www.lineagepower.com/oem/pdf/PDT006A0X.pdf 23 http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf 24 http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf 25 * Generic PMBus devices 26 Prefix: 'pmbus' 27 Addresses scanned: - 28 Datasheet: n.a. 29 30 Author: Guenter Roeck <guenter.roeck@ericsson.com> 31 32 33 Description 34 ----------- 35 36 This driver supports hardware montoring for various PMBus compliant devices. 37 It supports voltage, current, power, and temperature sensors as supported 38 by the device. 39 40 Each monitored channel has its own high and low limits, plus a critical 41 limit. 42 43 Fan support will be added in a later version of this driver. 44 45 46 Usage Notes 47 ----------- 48 49 This driver does not probe for PMBus devices, since there is no register 50 which can be safely used to identify the chip (The MFG_ID register is not 51 supported by all chips), and since there is no well defined address range for 52 PMBus devices. You will have to instantiate the devices explicitly. 53 54 Example: the following will load the driver for an LTC2978 at address 0x60 55 on I2C bus #1: 56 $ modprobe pmbus 57 $ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 58 59 60 Platform data support 61 --------------------- 62 63 Support for additional PMBus chips can be added by defining chip parameters in 64 a new chip specific driver file. For example, (untested) code to add support for 65 Emerson DS1200 power modules might look as follows. 66 67 static struct pmbus_driver_info ds1200_info = { 68 .pages = 1, 69 /* Note: All other sensors are in linear mode */ 70 .direct[PSC_VOLTAGE_OUT] = true, 71 .direct[PSC_TEMPERATURE] = true, 72 .direct[PSC_CURRENT_OUT] = true, 73 .m[PSC_VOLTAGE_IN] = 1, 74 .b[PSC_VOLTAGE_IN] = 0, 75 .R[PSC_VOLTAGE_IN] = 3, 76 .m[PSC_VOLTAGE_OUT] = 1, 77 .b[PSC_VOLTAGE_OUT] = 0, 78 .R[PSC_VOLTAGE_OUT] = 3, 79 .m[PSC_TEMPERATURE] = 1, 80 .b[PSC_TEMPERATURE] = 0, 81 .R[PSC_TEMPERATURE] = 3, 82 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 83 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 84 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 85 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 86 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 87 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 88 }; 89 90 static int ds1200_probe(struct i2c_client *client, 91 const struct i2c_device_id *id) 92 { 93 return pmbus_do_probe(client, id, &ds1200_info); 94 } 95 96 static int ds1200_remove(struct i2c_client *client) 97 { 98 return pmbus_do_remove(client); 99 } 100 101 static const struct i2c_device_id ds1200_id[] = { 102 {"ds1200", 0}, 103 {} 104 }; 105 106 MODULE_DEVICE_TABLE(i2c, ds1200_id); 107 108 /* This is the driver that will be inserted */ 109 static struct i2c_driver ds1200_driver = { 110 .driver = { 111 .name = "ds1200", 112 }, 113 .probe = ds1200_probe, 114 .remove = ds1200_remove, 115 .id_table = ds1200_id, 116 }; 117 118 static int __init ds1200_init(void) 119 { 120 return i2c_add_driver(&ds1200_driver); 121 } 122 123 static void __exit ds1200_exit(void) 124 { 125 i2c_del_driver(&ds1200_driver); 126 } 127 128 129 Sysfs entries 130 ------------- 131 132 When probing the chip, the driver identifies which PMBus registers are 133 supported, and determines available sensors from this information. 134 Attribute files only exist if respective sensors are suported by the chip. 135 Labels are provided to inform the user about the sensor associated with 136 a given sysfs entry. 137 138 The following attributes are supported. Limits are read-write; all other 139 attributes are read-only. 140 141 inX_input Measured voltage. From READ_VIN or READ_VOUT register. 142 inX_min Minimum Voltage. 143 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 144 inX_max Maximum voltage. 145 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 146 inX_lcrit Critical minimum Voltage. 147 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 148 inX_crit Critical maximum voltage. 149 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 150 inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 151 inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 152 inX_lcrit_alarm Voltage critical low alarm. 153 From VOLTAGE_UV_FAULT status. 154 inX_crit_alarm Voltage critical high alarm. 155 From VOLTAGE_OV_FAULT status. 156 inX_label "vin", "vcap", or "voutY" 157 158 currX_input Measured current. From READ_IIN or READ_IOUT register. 159 currX_max Maximum current. 160 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 161 currX_lcrit Critical minimum output current. 162 From IOUT_UC_FAULT_LIMIT register. 163 currX_crit Critical maximum current. 164 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 165 currX_alarm Current high alarm. 166 From IIN_OC_WARNING or IOUT_OC_WARNING status. 167 currX_max_alarm Current high alarm. 168 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 169 currX_lcrit_alarm Output current critical low alarm. 170 From IOUT_UC_FAULT status. 171 currX_crit_alarm Current critical high alarm. 172 From IIN_OC_FAULT or IOUT_OC_FAULT status. 173 currX_label "iin" or "ioutY" 174 175 powerX_input Measured power. From READ_PIN or READ_POUT register. 176 powerX_cap Output power cap. From POUT_MAX register. 177 powerX_max Power limit. From PIN_OP_WARN_LIMIT or 178 POUT_OP_WARN_LIMIT register. 179 powerX_crit Critical output power limit. 180 From POUT_OP_FAULT_LIMIT register. 181 powerX_alarm Power high alarm. 182 From PIN_OP_WARNING or POUT_OP_WARNING status. 183 powerX_crit_alarm Output power critical high alarm. 184 From POUT_OP_FAULT status. 185 powerX_label "pin" or "poutY" 186 187 tempX_input Measured temperature. 188 From READ_TEMPERATURE_X register. 189 tempX_min Mimimum temperature. From UT_WARN_LIMIT register. 190 tempX_max Maximum temperature. From OT_WARN_LIMIT register. 191 tempX_lcrit Critical low temperature. 192 From UT_FAULT_LIMIT register. 193 tempX_crit Critical high temperature. 194 From OT_FAULT_LIMIT register. 195 tempX_min_alarm Chip temperature low alarm. Set by comparing 196 READ_TEMPERATURE_X with UT_WARN_LIMIT if 197 TEMP_UT_WARNING status is set. 198 tempX_max_alarm Chip temperature high alarm. Set by comparing 199 READ_TEMPERATURE_X with OT_WARN_LIMIT if 200 TEMP_OT_WARNING status is set. 201 tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 202 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 203 TEMP_UT_FAULT status is set. 204 tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 205 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 206 TEMP_OT_FAULT status is set.