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