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leds: add driver for Mellanox systems LEDs
This makes it possible to create a set of LEDs for Mellanox systems: "msx6710", "msx6720", "msb7700", "msn2700", "msx1410", "msn2410", "msb7800", "msn2740", "msn2100". Driver obtains LED devices according to system configuration, provided through system DMI data, like mlxcpld:fan1:green, mlxcpld:fan1:red and creates devices in form: "devicename:colour:function". LED setting is controlled through on board CPLD Lattice device. For setting particular LED off, solid, blink: echo 0 > /sys/class/leds/mlxcpld\:status\:green/brightness echo 1 > /sys/class/leds/mlxcpld\:status\:green/brightness echo timer > /sys/class/leds/mlxcpld\:status\:green/trigger On module probing all LEDs are set green, on removing - off. Last setting overwrites previous, f.e. sequence for changing LED from green - red - green: echo 1 > /sys/class/leds/mlxcpld\:psu\:green/brightness echo 1 > /sys/class/leds/mlxcpld\:psu\:red/brightness echo 1 > /sys/class/leds/mlxcpld\:psu\:green/brightness Note: LEDs cannot be turned on/off simultaneously. The Kconfig currently controlling compilation of this code is: drivers/leds/Kconfig:config LEDS_MLXCPLD Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
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Kernel driver for Mellanox systems LEDs | ||
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Provide system LED support for the nex Mellanox systems: | ||
"msx6710", "msx6720", "msb7700", "msn2700", "msx1410", | ||
"msn2410", "msb7800", "msn2740", "msn2100". | ||
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Description | ||
----------- | ||
Driver provides the following LEDs for the systems "msx6710", "msx6720", | ||
"msb7700", "msn2700", "msx1410", "msn2410", "msb7800", "msn2740": | ||
mlxcpld:fan1:green | ||
mlxcpld:fan1:red | ||
mlxcpld:fan2:green | ||
mlxcpld:fan2:red | ||
mlxcpld:fan3:green | ||
mlxcpld:fan3:red | ||
mlxcpld:fan4:green | ||
mlxcpld:fan4:red | ||
mlxcpld:psu:green | ||
mlxcpld:psu:red | ||
mlxcpld:status:green | ||
mlxcpld:status:red | ||
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"status" | ||
CPLD reg offset: 0x20 | ||
Bits [3:0] | ||
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"psu" | ||
CPLD reg offset: 0x20 | ||
Bits [7:4] | ||
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"fan1" | ||
CPLD reg offset: 0x21 | ||
Bits [3:0] | ||
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"fan2" | ||
CPLD reg offset: 0x21 | ||
Bits [7:4] | ||
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"fan3" | ||
CPLD reg offset: 0x22 | ||
Bits [3:0] | ||
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"fan4" | ||
CPLD reg offset: 0x22 | ||
Bits [7:4] | ||
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Color mask for all the above LEDs: | ||
[bit3,bit2,bit1,bit0] or | ||
[bit7,bit6,bit5,bit4]: | ||
[0,0,0,0] = LED OFF | ||
[0,1,0,1] = Red static ON | ||
[1,1,0,1] = Green static ON | ||
[0,1,1,0] = Red blink 3Hz | ||
[1,1,1,0] = Green blink 3Hz | ||
[0,1,1,1] = Red blink 6Hz | ||
[1,1,1,1] = Green blink 6Hz | ||
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Driver provides the following LEDs for the system "msn2100": | ||
mlxcpld:fan:green | ||
mlxcpld:fan:red | ||
mlxcpld:psu1:green | ||
mlxcpld:psu1:red | ||
mlxcpld:psu2:green | ||
mlxcpld:psu2:red | ||
mlxcpld:status:green | ||
mlxcpld:status:red | ||
mlxcpld:uid:blue | ||
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"status" | ||
CPLD reg offset: 0x20 | ||
Bits [3:0] | ||
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"fan" | ||
CPLD reg offset: 0x21 | ||
Bits [3:0] | ||
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"psu1" | ||
CPLD reg offset: 0x23 | ||
Bits [3:0] | ||
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"psu2" | ||
CPLD reg offset: 0x23 | ||
Bits [7:4] | ||
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"uid" | ||
CPLD reg offset: 0x24 | ||
Bits [3:0] | ||
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Color mask for all the above LEDs, excepted uid: | ||
[bit3,bit2,bit1,bit0] or | ||
[bit7,bit6,bit5,bit4]: | ||
[0,0,0,0] = LED OFF | ||
[0,1,0,1] = Red static ON | ||
[1,1,0,1] = Green static ON | ||
[0,1,1,0] = Red blink 3Hz | ||
[1,1,1,0] = Green blink 3Hz | ||
[0,1,1,1] = Red blink 6Hz | ||
[1,1,1,1] = Green blink 6Hz | ||
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Color mask for uid LED: | ||
[bit3,bit2,bit1,bit0]: | ||
[0,0,0,0] = LED OFF | ||
[1,1,0,1] = Blue static ON | ||
[1,1,1,0] = Blue blink 3Hz | ||
[1,1,1,1] = Blue blink 6Hz | ||
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Driver supports HW blinking at 3Hz and 6Hz frequency (50% duty cycle). | ||
For 3Hz duty cylce is about 167 msec, for 6Hz is about 83 msec. |
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