128 lines
3.8 KiB
Bash
Executable File
128 lines
3.8 KiB
Bash
Executable File
# Perform an i2c device configuration : instantiate / delete.
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# Input is of the form:
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# "echo [driver] <i2c-address> > <i2c-bus/operation>"
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# where operation = "new_device" or "delete_device"
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i2c_config() {
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local count=0
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local MAX_BUS_RETRY=20
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local MAX_I2C_OP_RETRY=10
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i2c_bus_op=`echo "$@" | cut -d'>' -f 2`
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i2c_bus=$(dirname $i2c_bus_op)
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# check if bus exists
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while [[ "$count" -lt "$MAX_BUS_RETRY" ]]; do
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[[ -e $i2c_bus ]] && break || sleep .1
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count=$((count+1))
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done
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if [[ "$count" -eq "$MAX_BUS_RETRY" ]]; then
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echo "dell_i2c_utils : ERROR: $@ : i2c bus not created"
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return
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fi
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# perform the add/delete
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count=0
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while [[ "$count" -lt "$MAX_I2C_OP_RETRY" ]]; do
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eval "$@" > /dev/null 2>&1
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[[ $? == 0 ]] && break || sleep .2
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count=$((count+1))
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done
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if [[ "$count" -eq "$MAX_I2C_OP_RETRY" ]]; then
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echo "dell_i2c_utils : ERROR: $@ : i2c operation failed"
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return
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fi
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}
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# Check if a i2c bus exists. Poll for upto 2 seconds since mux creation may take time..
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# Input: bus to check for existence
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i2c_poll_bus_exists() {
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local count=0
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local MAX_BUS_RETRY=20
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local i2c_bus
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i2c_bus=$1
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# check if bus exists
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while [[ "$count" -lt "$MAX_BUS_RETRY" ]]; do
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[[ -e $i2c_bus ]] && break || sleep .1
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count=$((count+1))
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done
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if [[ "$count" -eq "$MAX_BUS_RETRY" ]]; then
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echo "dell_i2c_utils : ERROR: $@ : i2c bus not created"
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return 1
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else
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return 0
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fi
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}
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# Perform an i2c mux device create
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# Input is of the form:
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# i2c_mux_create mux_driver i2c_addr i2c_bus_num i2c_child_bus_num_start
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# where i2c_bus_num is the bus number in which the mux is to be created and
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# i2c_child_bus_num_start is the first of the 8 bus channels that this mux should create
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i2c_mux_create() {
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local MAX_MUX_CHANNEL_RETRY=3
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local MAX_MUX_CHANNELS=8
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local count=0
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local i
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local mux_driver=$1
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local i2c_addr=$2
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local i2c_bus_num=$3
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local i2c_child_bus_num_start=$4
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# Construct the i2c bus, the first and last bus channels that will be created under the MUX
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i2c_bus=/sys/bus/i2c/devices/i2c-$i2c_bus_num
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i2c_mux_channel_first=$i2c_bus/i2c-$i2c_child_bus_num_start
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i2c_mux_channel_last=$i2c_bus/i2c-$(expr $i2c_child_bus_num_start + $MAX_MUX_CHANNELS - 1)
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if i2c_poll_bus_exists $i2c_bus; then
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while [[ "$count" -lt "$MAX_MUX_CHANNEL_RETRY" ]]; do
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eval "echo $mux_driver $i2c_addr > /sys/bus/i2c/devices/i2c-$i2c_bus_num/new_device" > /dev/null 2>&1
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ret=$?
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# Give more time for the mux channels to get created based on retries
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i=0
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while [[ "$i" -lt "$count" ]]; do
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sleep 1
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i=$((i+1))
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done
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# Check if the (first and last) mux channels got created
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if [[ $ret -eq "0" && -e $i2c_mux_channel_first && -e $i2c_mux_channel_last ]]; then
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break;
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else
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# If the channel did not get created, remove the mux, reset the mux tree and retry
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echo "dell_i2c_utils : ERROR: i2c mux channel not created for $mux_driver,$i2c_addr,$i2c_bus_num"
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i2c_mux_delete $i2c_addr $i2c_bus_num
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reset_muxes
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fi
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count=$((count+1))
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done
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fi
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if [[ "$count" -eq "$MAX_MUX_CHANNEL_RETRY" ]]; then
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echo "dell_i2c_utils : ERROR: $1,$2 : i2c mux channel not created"
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return
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fi
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return
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}
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# Perform an i2c mux device delete
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# Input is of the form:
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# i2c_mux_delete i2c_addr i2c_bus_num
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i2c_mux_delete() {
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local i2c_addr
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local i2c_bus_num
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i2c_addr=$1
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i2c_bus_num=$2
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i2c_config "echo $i2c_addr > /sys/bus/i2c/devices/i2c-$i2c_bus_num/delete_device"
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}
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