63 lines
1.5 KiB
Bash
Executable File
63 lines
1.5 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 "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 "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 "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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