1Kernel driver pmbus 2==================== 3 4Supported 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: 'mdt040', '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 http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf 26 * Texas Instruments TPS40400, TPS544B20, TPS544B25, TPS544C20, TPS544C25 27 Prefixes: 'tps40400', 'tps544b20', 'tps544b25', 'tps544c20', 'tps544c25' 28 Addresses scanned: - 29 Datasheets: 30 http://www.ti.com/lit/gpn/tps40400 31 http://www.ti.com/lit/gpn/tps544b20 32 http://www.ti.com/lit/gpn/tps544b25 33 http://www.ti.com/lit/gpn/tps544c20 34 http://www.ti.com/lit/gpn/tps544c25 35 * Generic PMBus devices 36 Prefix: 'pmbus' 37 Addresses scanned: - 38 Datasheet: n.a. 39 40Author: Guenter Roeck <linux@roeck-us.net> 41 42 43Description 44----------- 45 46This driver supports hardware monitoring for various PMBus compliant devices. 47It supports voltage, current, power, and temperature sensors as supported 48by the device. 49 50Each monitored channel has its own high and low limits, plus a critical 51limit. 52 53Fan support will be added in a later version of this driver. 54 55 56Usage Notes 57----------- 58 59This driver does not probe for PMBus devices, since there is no register 60which can be safely used to identify the chip (The MFG_ID register is not 61supported by all chips), and since there is no well defined address range for 62PMBus devices. You will have to instantiate the devices explicitly. 63 64Example: the following will load the driver for an LTC2978 at address 0x60 65on I2C bus #1: 66$ modprobe pmbus 67$ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 68 69 70Platform data support 71--------------------- 72 73Support for additional PMBus chips can be added by defining chip parameters in 74a new chip specific driver file. For example, (untested) code to add support for 75Emerson DS1200 power modules might look as follows. 76 77static struct pmbus_driver_info ds1200_info = { 78 .pages = 1, 79 /* Note: All other sensors are in linear mode */ 80 .direct[PSC_VOLTAGE_OUT] = true, 81 .direct[PSC_TEMPERATURE] = true, 82 .direct[PSC_CURRENT_OUT] = true, 83 .m[PSC_VOLTAGE_IN] = 1, 84 .b[PSC_VOLTAGE_IN] = 0, 85 .R[PSC_VOLTAGE_IN] = 3, 86 .m[PSC_VOLTAGE_OUT] = 1, 87 .b[PSC_VOLTAGE_OUT] = 0, 88 .R[PSC_VOLTAGE_OUT] = 3, 89 .m[PSC_TEMPERATURE] = 1, 90 .b[PSC_TEMPERATURE] = 0, 91 .R[PSC_TEMPERATURE] = 3, 92 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 93 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 94 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 95 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 96 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 97 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 98}; 99 100static int ds1200_probe(struct i2c_client *client, 101 const struct i2c_device_id *id) 102{ 103 return pmbus_do_probe(client, id, &ds1200_info); 104} 105 106static int ds1200_remove(struct i2c_client *client) 107{ 108 return pmbus_do_remove(client); 109} 110 111static const struct i2c_device_id ds1200_id[] = { 112 {"ds1200", 0}, 113 {} 114}; 115 116MODULE_DEVICE_TABLE(i2c, ds1200_id); 117 118/* This is the driver that will be inserted */ 119static struct i2c_driver ds1200_driver = { 120 .driver = { 121 .name = "ds1200", 122 }, 123 .probe = ds1200_probe, 124 .remove = ds1200_remove, 125 .id_table = ds1200_id, 126}; 127 128static int __init ds1200_init(void) 129{ 130 return i2c_add_driver(&ds1200_driver); 131} 132 133static void __exit ds1200_exit(void) 134{ 135 i2c_del_driver(&ds1200_driver); 136} 137 138 139Sysfs entries 140------------- 141 142When probing the chip, the driver identifies which PMBus registers are 143supported, and determines available sensors from this information. 144Attribute files only exist if respective sensors are supported by the chip. 145Labels are provided to inform the user about the sensor associated with 146a given sysfs entry. 147 148The following attributes are supported. Limits are read-write; all other 149attributes are read-only. 150 151inX_input Measured voltage. From READ_VIN or READ_VOUT register. 152inX_min Minimum Voltage. 153 From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. 154inX_max Maximum voltage. 155 From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. 156inX_lcrit Critical minimum Voltage. 157 From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. 158inX_crit Critical maximum voltage. 159 From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. 160inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. 161inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. 162inX_lcrit_alarm Voltage critical low alarm. 163 From VOLTAGE_UV_FAULT status. 164inX_crit_alarm Voltage critical high alarm. 165 From VOLTAGE_OV_FAULT status. 166inX_label "vin", "vcap", or "voutY" 167 168currX_input Measured current. From READ_IIN or READ_IOUT register. 169currX_max Maximum current. 170 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. 171currX_lcrit Critical minimum output current. 172 From IOUT_UC_FAULT_LIMIT register. 173currX_crit Critical maximum current. 174 From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. 175currX_alarm Current high alarm. 176 From IIN_OC_WARNING or IOUT_OC_WARNING status. 177currX_max_alarm Current high alarm. 178 From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. 179currX_lcrit_alarm Output current critical low alarm. 180 From IOUT_UC_FAULT status. 181currX_crit_alarm Current critical high alarm. 182 From IIN_OC_FAULT or IOUT_OC_FAULT status. 183currX_label "iin" or "ioutY" 184 185powerX_input Measured power. From READ_PIN or READ_POUT register. 186powerX_cap Output power cap. From POUT_MAX register. 187powerX_max Power limit. From PIN_OP_WARN_LIMIT or 188 POUT_OP_WARN_LIMIT register. 189powerX_crit Critical output power limit. 190 From POUT_OP_FAULT_LIMIT register. 191powerX_alarm Power high alarm. 192 From PIN_OP_WARNING or POUT_OP_WARNING status. 193powerX_crit_alarm Output power critical high alarm. 194 From POUT_OP_FAULT status. 195powerX_label "pin" or "poutY" 196 197tempX_input Measured temperature. 198 From READ_TEMPERATURE_X register. 199tempX_min Mimimum temperature. From UT_WARN_LIMIT register. 200tempX_max Maximum temperature. From OT_WARN_LIMIT register. 201tempX_lcrit Critical low temperature. 202 From UT_FAULT_LIMIT register. 203tempX_crit Critical high temperature. 204 From OT_FAULT_LIMIT register. 205tempX_min_alarm Chip temperature low alarm. Set by comparing 206 READ_TEMPERATURE_X with UT_WARN_LIMIT if 207 TEMP_UT_WARNING status is set. 208tempX_max_alarm Chip temperature high alarm. Set by comparing 209 READ_TEMPERATURE_X with OT_WARN_LIMIT if 210 TEMP_OT_WARNING status is set. 211tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing 212 READ_TEMPERATURE_X with UT_FAULT_LIMIT if 213 TEMP_UT_FAULT status is set. 214tempX_crit_alarm Chip temperature critical high alarm. Set by comparing 215 READ_TEMPERATURE_X with OT_FAULT_LIMIT if 216 TEMP_OT_FAULT status is set. 217
