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[PATCH] I2C: Rewrite i2c_probe
i2c_probe was quite complex and slow, so I rewrote it in a more efficient and hopefully clearer way. Note that this slightly changes the way the module parameters are handled. This shouldn't change anything for the most common cases though. For one thing, the function now respects the order of the parameters for address probing. It used to always do lower addresses first. The new approach gives the user more control. For another, ignore addresses don't overrule probe addresses anymore. This could have been restored the way it was at the cost of a few more lines of code, but I don't think it's worth it. Both lists are given as module parameters, so a user would be quite silly to specify the same addresses in both lists. The normal addresses list is the only one that isn't controlled by a module parameter, thus is the only one the user may reasonably want to remove an address from. Another significant change is the fact that i2c_probe() will no more stop when a detection function returns -ENODEV. Just because a driver found a chip it doesn't support isn't a valid reason to stop all probings for this one driver. This closes the long standing lm_sensors ticket #1807. http://www2.lm-sensors.nu/~lm78/readticket.cgi?ticket=1807 I updated the documentation accordingly. In terms of algorithmic complexity, the new code is way better. If I is the ignore address count, P the probe address count, N the normal address count and F the force address count, the old code was doing 128 * (F + I + P + N) iterations max, while the new code does F + P + ((I+1) * N) iterations max. For the most common case where F, I and P are empty, this is down from 128 * N to N. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jean Delvare
Greg Kroah-Hartman
parent
3b6c0634cc
commit
a89ba0bc02
@ -241,9 +241,10 @@ Below, some things are only needed if this is a `sensors' driver. Those
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parts are between /* SENSORS ONLY START */ and /* SENSORS ONLY END */
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markers.
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This function should only return an error (any value != 0) if there is
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some reason why no more detection should be done anymore. If the
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detection just fails for this address, return 0.
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Returning an error different from -ENODEV in a detect function will cause
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the detection to stop: other addresses and adapters won't be scanned.
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This should only be done on fatal or internal errors, such as a memory
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shortage or i2c_attach_client failing.
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For now, you can ignore the `flags' parameter. It is there for future use.
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@ -662,107 +662,120 @@ int i2c_control(struct i2c_client *client,
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* Will not work for 10-bit addresses!
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* ----------------------------------------------------
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*/
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/* Return: kind (>= 0) if force found, -1 if not found */
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static inline int i2c_probe_forces(struct i2c_adapter *adapter, int addr,
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unsigned short **forces)
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static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind,
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int (*found_proc) (struct i2c_adapter *, int, int))
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{
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unsigned short kind;
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int j, adap_id = i2c_adapter_id(adapter);
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int err;
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for (kind = 0; forces[kind]; kind++) {
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for (j = 0; forces[kind][j] != I2C_CLIENT_END; j += 2) {
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if ((forces[kind][j] == adap_id ||
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forces[kind][j] == ANY_I2C_BUS)
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&& forces[kind][j + 1] == addr) {
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dev_dbg(&adapter->dev, "found force parameter, "
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"addr 0x%02x, kind %u\n", addr, kind);
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return kind;
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}
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}
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/* Make sure the address is valid */
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if (addr < 0x03 || addr > 0x77) {
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dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n",
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addr);
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return -EINVAL;
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}
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return -1;
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/* Skip if already in use */
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if (i2c_check_addr(adapter, addr))
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return 0;
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/* Make sure there is something at this address, unless forced */
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if (kind < 0
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&& i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) < 0)
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return 0;
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/* Finally call the custom detection function */
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err = found_proc(adapter, addr, kind);
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/* -ENODEV can be returned if there is a chip at the given address
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but it isn't supported by this chip driver. We catch it here as
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this isn't an error. */
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return (err == -ENODEV) ? 0 : err;
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}
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int i2c_probe(struct i2c_adapter *adapter,
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struct i2c_client_address_data *address_data,
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int (*found_proc) (struct i2c_adapter *, int, int))
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{
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int addr,i,found,err;
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int i, err;
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int adap_id = i2c_adapter_id(adapter);
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/* Forget it if we can't probe using SMBUS_QUICK */
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if (! i2c_check_functionality(adapter,I2C_FUNC_SMBUS_QUICK))
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return -1;
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for (addr = 0x00; addr <= 0x7f; addr++) {
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/* Force entries are done first, and are not affected by ignore
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entries */
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if (address_data->forces) {
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unsigned short **forces = address_data->forces;
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int kind;
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/* Skip if already in use */
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if (i2c_check_addr(adapter,addr))
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continue;
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/* If it is in one of the force entries, we don't do any detection
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at all */
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found = 0;
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if (address_data->forces) {
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int kind = i2c_probe_forces(adapter, addr,
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address_data->forces);
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if (kind >= 0) { /* force found */
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if ((err = found_proc(adapter, addr, kind)))
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return err;
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continue;
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for (kind = 0; forces[kind]; kind++) {
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for (i = 0; forces[kind][i] != I2C_CLIENT_END;
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i += 2) {
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if (forces[kind][i] == adap_id
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|| forces[kind][i] == ANY_I2C_BUS) {
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dev_dbg(&adapter->dev, "found force "
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"parameter for adapter %d, "
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"addr 0x%02x, kind %d\n",
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adap_id, forces[kind][i + 1],
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kind);
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err = i2c_probe_address(adapter,
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forces[kind][i + 1],
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kind, found_proc);
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if (err)
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return err;
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}
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}
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}
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/* If this address is in one of the ignores, we can forget about
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it right now */
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for (i = 0;
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!found && (address_data->ignore[i] != I2C_CLIENT_END);
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i += 2) {
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if (((adap_id == address_data->ignore[i]) ||
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((address_data->ignore[i] == ANY_I2C_BUS))) &&
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(addr == address_data->ignore[i+1])) {
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dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, "
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"addr %04x\n", adap_id ,addr);
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found = 1;
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}
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}
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if (found)
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continue;
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/* Now, we will do a detection, but only if it is in the normal or
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probe entries */
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for (i = 0;
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!found && (address_data->normal_i2c[i] != I2C_CLIENT_END);
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i += 1) {
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if (addr == address_data->normal_i2c[i]) {
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found = 1;
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dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, "
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"addr %02x\n", adap_id, addr);
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}
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}
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for (i = 0;
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!found && (address_data->probe[i] != I2C_CLIENT_END);
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i += 2) {
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if (((adap_id == address_data->probe[i]) ||
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((address_data->probe[i] == ANY_I2C_BUS))) &&
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(addr == address_data->probe[i+1])) {
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found = 1;
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dev_dbg(&adapter->dev, "found probe parameter for adapter %d, "
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"addr %04x\n", adap_id,addr);
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}
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}
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if (!found)
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continue;
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/* OK, so we really should examine this address. First check
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whether there is some client here at all! */
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if (i2c_smbus_xfer(adapter,addr,0,0,0,I2C_SMBUS_QUICK,NULL) >= 0)
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if ((err = found_proc(adapter,addr,-1)))
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return err;
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}
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/* Probe entries are done second, and are not affected by ignore
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entries either */
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for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) {
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if (address_data->probe[i] == adap_id
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|| address_data->probe[i] == ANY_I2C_BUS) {
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dev_dbg(&adapter->dev, "found probe parameter for "
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"adapter %d, addr 0x%02x\n", adap_id,
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address_data->probe[i + 1]);
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err = i2c_probe_address(adapter,
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address_data->probe[i + 1],
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-1, found_proc);
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if (err)
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return err;
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}
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}
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/* Normal entries are done last, unless shadowed by an ignore entry */
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for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) {
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int j, ignore;
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ignore = 0;
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for (j = 0; address_data->ignore[j] != I2C_CLIENT_END;
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j += 2) {
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if ((address_data->ignore[j] == adap_id ||
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address_data->ignore[j] == ANY_I2C_BUS)
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&& address_data->ignore[j + 1]
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== address_data->normal_i2c[i]) {
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dev_dbg(&adapter->dev, "found ignore "
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"parameter for adapter %d, "
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"addr 0x%02x\n", adap_id,
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address_data->ignore[j + 1]);
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}
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ignore = 1;
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break;
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}
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if (ignore)
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continue;
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dev_dbg(&adapter->dev, "found normal entry for adapter %d, "
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"addr 0x%02x\n", adap_id,
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address_data->normal_i2c[i]);
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err = i2c_probe_address(adapter, address_data->normal_i2c[i],
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-1, found_proc);
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if (err)
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return err;
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}
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return 0;
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}
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