Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
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 LTC2975 10 Prefix: 'ltc2975' 11 Addresses scanned: - 12 Datasheet: http://www.linear.com/product/ltc2975 13 * Linear Technology LTC2977 14 Prefix: 'ltc2977' 15 Addresses scanned: - 16 Datasheet: http://www.linear.com/product/ltc2977 17 * Linear Technology LTC2978, LTC2978A 18 Prefix: 'ltc2978' 19 Addresses scanned: - 20 Datasheet: http://www.linear.com/product/ltc2978 21 http://www.linear.com/product/ltc2978a 22 * Linear Technology LTC2980 23 Prefix: 'ltc2980' 24 Addresses scanned: - 25 Datasheet: http://www.linear.com/product/ltc2980 26 * Linear Technology LTC3880 27 Prefix: 'ltc3880' 28 Addresses scanned: - 29 Datasheet: http://www.linear.com/product/ltc3880 30 * Linear Technology LTC3882 31 Prefix: 'ltc3882' 32 Addresses scanned: - 33 Datasheet: http://www.linear.com/product/ltc3882 34 * Linear Technology LTC3883 35 Prefix: 'ltc3883' 36 Addresses scanned: - 37 Datasheet: http://www.linear.com/product/ltc3883 38 * Linear Technology LTC3886 39 Prefix: 'ltc3886' 40 Addresses scanned: - 41 Datasheet: http://www.linear.com/product/ltc3886 42 * Linear Technology LTC3887 43 Prefix: 'ltc3887' 44 Addresses scanned: - 45 Datasheet: http://www.linear.com/product/ltc3887 46 * Linear Technology LTM2987 47 Prefix: 'ltm2987' 48 Addresses scanned: - 49 Datasheet: http://www.linear.com/product/ltm2987 50 * Linear Technology LTM4675 51 Prefix: 'ltm4675' 52 Addresses scanned: - 53 Datasheet: http://www.linear.com/product/ltm4675 54 * Linear Technology LTM4676 55 Prefix: 'ltm4676' 56 Addresses scanned: - 57 Datasheet: http://www.linear.com/product/ltm4676 58 59 Author: Guenter Roeck <linux@roeck-us.net> 60 61 62 Description 63 ----------- 64 65 LTC2974 and LTC2975 are quad digital power supply managers. 66 LTC2978 is an octal power supply monitor. 67 LTC2977 is a pin compatible replacement for LTC2978. 68 LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977 69 in a single die. The chip is instantiated and reported as two separate chips 70 on two different I2C bus addresses. 71 LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down 72 DC/DC controllers. 73 LTC3883 is a single phase step-down DC/DC controller. 74 LTM2987 is a 16-channel Power System Manager with two LTC2977 plus 75 additional components on a single die. The chip is instantiated and reported 76 as two separate chips on two different I2C bus addresses. 77 LTM4675 is a dual 9A or single 18A μModule regulator 78 LTM4676 is a dual 13A or single 26A uModule regulator. 79 80 81 Usage Notes 82 ----------- 83 84 This driver does not probe for PMBus devices. You will have to instantiate 85 devices explicitly. 86 87 Example: the following commands will load the driver for an LTC2978 at address 88 0x60 on I2C bus #1: 89 90 # modprobe ltc2978 91 # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device 92 93 94 Sysfs attributes 95 ---------------- 96 97 in1_label "vin" 98 in1_input Measured input voltage. 99 in1_min Minimum input voltage. 100 in1_max Maximum input voltage. 101 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and 102 LTM2987 only. 103 in1_lcrit Critical minimum input voltage. 104 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and 105 LTM2987 only. 106 in1_crit Critical maximum input voltage. 107 in1_min_alarm Input voltage low alarm. 108 in1_max_alarm Input voltage high alarm. 109 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and 110 LTM2987 only. 111 in1_lcrit_alarm Input voltage critical low alarm. 112 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and 113 LTM2987 only. 114 in1_crit_alarm Input voltage critical high alarm. 115 in1_lowest Lowest input voltage. 116 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and 117 LTM2987 only. 118 in1_highest Highest input voltage. 119 in1_reset_history Reset input voltage history. 120 121 in[N]_label "vout[1-8]". 122 LTC2974, LTC2975: N=2-5 123 LTC2977, LTC2980, LTM2987: N=2-9 124 LTC2978: N=2-9 125 LTC3880, LTC3882, LTC23886 LTC3887, LTM4675, LTM4676: 126 N=2-3 127 LTC3883: N=2 128 in[N]_input Measured output voltage. 129 in[N]_min Minimum output voltage. 130 in[N]_max Maximum output voltage. 131 in[N]_lcrit Critical minimum output voltage. 132 in[N]_crit Critical maximum output voltage. 133 in[N]_min_alarm Output voltage low alarm. 134 in[N]_max_alarm Output voltage high alarm. 135 in[N]_lcrit_alarm Output voltage critical low alarm. 136 in[N]_crit_alarm Output voltage critical high alarm. 137 in[N]_lowest Lowest output voltage. LTC2974, LTC2975, 138 and LTC2978 only. 139 in[N]_highest Highest output voltage. 140 in[N]_reset_history Reset output voltage history. 141 142 temp[N]_input Measured temperature. 143 On LTC2974 and LTC2975, temp[1-4] report external 144 temperatures, and temp5 reports the chip temperature. 145 On LTC2977, LTC2980, LTC2978, and LTM2987, only one 146 temperature measurement is supported and reports 147 the chip temperature. 148 On LTC3880, LTC3882, LTC3887, LTM4675, and LTM4676, 149 temp1 and temp2 report external temperatures, and temp3 150 reports the chip temperature. 151 On LTC3883, temp1 reports an external temperature, 152 and temp2 reports the chip temperature. 153 temp[N]_min Mimimum temperature. LTC2974, LCT2977, LTM2980, LTC2978, 154 and LTM2987 only. 155 temp[N]_max Maximum temperature. 156 temp[N]_lcrit Critical low temperature. 157 temp[N]_crit Critical high temperature. 158 temp[N]_min_alarm Temperature low alarm. 159 LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and 160 LTM2987 only. 161 temp[N]_max_alarm Temperature high alarm. 162 temp[N]_lcrit_alarm Temperature critical low alarm. 163 temp[N]_crit_alarm Temperature critical high alarm. 164 temp[N]_lowest Lowest measured temperature. 165 LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and 166 LTM2987 only. 167 Not supported for chip temperature sensor on LTC2974 and 168 LTC2975. 169 temp[N]_highest Highest measured temperature. Not supported for chip 170 temperature sensor on LTC2974 and LTC2975. 171 temp[N]_reset_history Reset temperature history. Not supported for chip 172 temperature sensor on LTC2974 and LTC2975. 173 174 power1_label "pin". LTC3883 and LTC3886 only. 175 power1_input Measured input power. 176 177 power[N]_label "pout[1-4]". 178 LTC2974, LTC2975: N=1-4 179 LTC2977, LTC2980, LTM2987: Not supported 180 LTC2978: Not supported 181 LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, LTM4676: 182 N=1-2 183 LTC3883: N=2 184 power[N]_input Measured output power. 185 186 curr1_label "iin". LTC3880, LTC3883, LTC3886, LTC3887, LTM4675, 187 and LTM4676 only. 188 curr1_input Measured input current. 189 curr1_max Maximum input current. 190 curr1_max_alarm Input current high alarm. 191 curr1_highest Highest input current. LTC3883 and LTC3886 only. 192 curr1_reset_history Reset input current history. LTC3883 and LTC3886 only. 193 194 curr[N]_label "iout[1-4]". 195 LTC2974, LTC2975: N=1-4 196 LTC2977, LTC2980, LTM2987: not supported 197 LTC2978: not supported 198 LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, LTM4676: 199 N=2-3 200 LTC3883: N=2 201 curr[N]_input Measured output current. 202 curr[N]_max Maximum output current. 203 curr[N]_crit Critical high output current. 204 curr[N]_lcrit Critical low output current. LTC2974 and LTC2975 only. 205 curr[N]_max_alarm Output current high alarm. 206 curr[N]_crit_alarm Output current critical high alarm. 207 curr[N]_lcrit_alarm Output current critical low alarm. 208 LTC2974 and LTC2975 only. 209 curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only. 210 curr[N]_highest Highest output current. 211 curr[N]_reset_history Reset output current history.