| 1 | Kernel driver ltc2978 |
| 2 | ===================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Linear Technology LTC2974 |
| 6 | Prefix: 'ltc2974' |
| 7 | Addresses scanned: - |
| 8 | Datasheet: http://www.linear.com/product/ltc2974 |
| 9 | * Linear Technology LTC2977 |
| 10 | Prefix: 'ltc2977' |
| 11 | Addresses scanned: - |
| 12 | Datasheet: http://www.linear.com/product/ltc2977 |
| 13 | * Linear Technology LTC2978, LTC2978A |
| 14 | Prefix: 'ltc2978' |
| 15 | Addresses scanned: - |
| 16 | Datasheet: http://www.linear.com/product/ltc2978 |
| 17 | http://www.linear.com/product/ltc2978a |
| 18 | * Linear Technology LTC3880 |
| 19 | Prefix: 'ltc3880' |
| 20 | Addresses scanned: - |
| 21 | Datasheet: http://www.linear.com/product/ltc3880 |
| 22 | * Linear Technology LTC3883 |
| 23 | Prefix: 'ltc3883' |
| 24 | Addresses scanned: - |
| 25 | Datasheet: http://www.linear.com/product/ltc3883 |
| 26 | * Linear Technology LTM4676 |
| 27 | Prefix: 'ltm4676' |
| 28 | Addresses scanned: - |
| 29 | Datasheet: http://www.linear.com/product/ltm4676 |
| 30 | |
| 31 | Author: Guenter Roeck <linux@roeck-us.net> |
| 32 | |
| 33 | |
| 34 | Description |
| 35 | ----------- |
| 36 | |
| 37 | LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply |
| 38 | monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual |
| 39 | output poly-phase step-down DC/DC controller. LTC3883 is a single phase |
| 40 | step-down DC/DC controller. LTM4676 is a dual 13A or single 26A uModule |
| 41 | regulator. |
| 42 | |
| 43 | |
| 44 | Usage Notes |
| 45 | ----------- |
| 46 | |
| 47 | This driver does not probe for PMBus devices. You will have to instantiate |
| 48 | devices explicitly. |
| 49 | |
| 50 | Example: the following commands will load the driver for an LTC2978 at address |
| 51 | 0x60 on I2C bus #1: |
| 52 | |
| 53 | # modprobe ltc2978 |
| 54 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device |
| 55 | |
| 56 | |
| 57 | Sysfs attributes |
| 58 | ---------------- |
| 59 | |
| 60 | in1_label "vin" |
| 61 | in1_input Measured input voltage. |
| 62 | in1_min Minimum input voltage. |
| 63 | in1_max Maximum input voltage. |
| 64 | LTC2974, LTC2977, and LTC2978 only. |
| 65 | in1_lcrit Critical minimum input voltage. |
| 66 | LTC2974, LTC2977, and LTC2978 only. |
| 67 | in1_crit Critical maximum input voltage. |
| 68 | in1_min_alarm Input voltage low alarm. |
| 69 | in1_max_alarm Input voltage high alarm. |
| 70 | LTC2974, LTC2977, and LTC2978 only. |
| 71 | in1_lcrit_alarm Input voltage critical low alarm. |
| 72 | LTC2974, LTC2977, and LTC2978 only. |
| 73 | in1_crit_alarm Input voltage critical high alarm. |
| 74 | in1_lowest Lowest input voltage. |
| 75 | LTC2974, LTC2977, and LTC2978 only. |
| 76 | in1_highest Highest input voltage. |
| 77 | in1_reset_history Reset input voltage history. |
| 78 | |
| 79 | in[N]_label "vout[1-8]". |
| 80 | LTC2974: N=2-5 |
| 81 | LTC2977: N=2-9 |
| 82 | LTC2978: N=2-9 |
| 83 | LTC3880, LTM4676: N=2-3 |
| 84 | LTC3883: N=2 |
| 85 | in[N]_input Measured output voltage. |
| 86 | in[N]_min Minimum output voltage. |
| 87 | in[N]_max Maximum output voltage. |
| 88 | in[N]_lcrit Critical minimum output voltage. |
| 89 | in[N]_crit Critical maximum output voltage. |
| 90 | in[N]_min_alarm Output voltage low alarm. |
| 91 | in[N]_max_alarm Output voltage high alarm. |
| 92 | in[N]_lcrit_alarm Output voltage critical low alarm. |
| 93 | in[N]_crit_alarm Output voltage critical high alarm. |
| 94 | in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only. |
| 95 | in[N]_highest Highest output voltage. |
| 96 | in[N]_reset_history Reset output voltage history. |
| 97 | |
| 98 | temp[N]_input Measured temperature. |
| 99 | On LTC2974, temp[1-4] report external temperatures, |
| 100 | and temp5 reports the chip temperature. |
| 101 | On LTC2977 and LTC2978, only one temperature measurement |
| 102 | is supported and reports the chip temperature. |
| 103 | On LTC3880 and LTM4676, temp1 and temp2 report external |
| 104 | temperatures, and temp3 reports the chip temperature. |
| 105 | On LTC3883, temp1 reports an external temperature, |
| 106 | and temp2 reports the chip temperature. |
| 107 | temp[N]_min Mimimum temperature. LTC2974, LCT2977, and LTC2978 only. |
| 108 | temp[N]_max Maximum temperature. |
| 109 | temp[N]_lcrit Critical low temperature. |
| 110 | temp[N]_crit Critical high temperature. |
| 111 | temp[N]_min_alarm Temperature low alarm. |
| 112 | LTC2974, LTC2977, and LTC2978 only. |
| 113 | temp[N]_max_alarm Temperature high alarm. |
| 114 | temp[N]_lcrit_alarm Temperature critical low alarm. |
| 115 | temp[N]_crit_alarm Temperature critical high alarm. |
| 116 | temp[N]_lowest Lowest measured temperature. |
| 117 | LTC2974, LTC2977, and LTC2978 only. |
| 118 | Not supported for chip temperature sensor on LTC2974. |
| 119 | temp[N]_highest Highest measured temperature. Not supported for chip |
| 120 | temperature sensor on LTC2974. |
| 121 | temp[N]_reset_history Reset temperature history. Not supported for chip |
| 122 | temperature sensor on LTC2974. |
| 123 | |
| 124 | power1_label "pin". LTC3883 only. |
| 125 | power1_input Measured input power. |
| 126 | |
| 127 | power[N]_label "pout[1-4]". |
| 128 | LTC2974: N=1-4 |
| 129 | LTC2977: Not supported |
| 130 | LTC2978: Not supported |
| 131 | LTC3880, LTM4676: N=1-2 |
| 132 | LTC3883: N=2 |
| 133 | power[N]_input Measured output power. |
| 134 | |
| 135 | curr1_label "iin". LTC3880, LTC3883, and LTM4676 only. |
| 136 | curr1_input Measured input current. |
| 137 | curr1_max Maximum input current. |
| 138 | curr1_max_alarm Input current high alarm. |
| 139 | curr1_highest Highest input current. LTC3883 only. |
| 140 | curr1_reset_history Reset input current history. LTC3883 only. |
| 141 | |
| 142 | curr[N]_label "iout[1-4]". |
| 143 | LTC2974: N=1-4 |
| 144 | LTC2977: not supported |
| 145 | LTC2978: not supported |
| 146 | LTC3880, LTM4676: N=2-3 |
| 147 | LTC3883: N=2 |
| 148 | curr[N]_input Measured output current. |
| 149 | curr[N]_max Maximum output current. |
| 150 | curr[N]_crit Critical high output current. |
| 151 | curr[N]_lcrit Critical low output current. LTC2974 only. |
| 152 | curr[N]_max_alarm Output current high alarm. |
| 153 | curr[N]_crit_alarm Output current critical high alarm. |
| 154 | curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only. |
| 155 | curr[N]_lowest Lowest output current. LTC2974 only. |
| 156 | curr[N]_highest Highest output current. |
| 157 | curr[N]_reset_history Reset output current history. |