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i2c: break out OF support into separate file
Also removes some ifdeffery. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang
parent
22c78d1cce
commit
5bf4fa7dae
4 changed files with 286 additions and 264 deletions
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@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
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obj-$(CONFIG_I2C) += i2c-core.o
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i2c-core-objs := i2c-core-base.o i2c-core-smbus.o
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i2c-core-$(CONFIG_I2C_SLAVE) += i2c-core-slave.o
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i2c-core-$(CONFIG_OF) += i2c-core-of.o
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obj-$(CONFIG_I2C_SMBUS) += i2c-smbus.o
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obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
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@ -16,9 +16,6 @@
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>.
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Mux support by Rodolfo Giometti <giometti@enneenne.com> and
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Michael Lawnick <michael.lawnick.ext@nsn.com>
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OF support is copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
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(based on a previous patch from Jon Smirl <jonsmirl@gmail.com>) and
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(c) 2013 Wolfram Sang <wsa@the-dreams.de>
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I2C ACPI code Copyright (C) 2014 Intel Corp
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Author: Lan Tianyu <tianyu.lan@intel.com>
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*/
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@ -1191,7 +1188,7 @@ static unsigned short i2c_encode_flags_to_addr(struct i2c_client *client)
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/* This is a permissive address validity check, I2C address map constraints
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* are purposely not enforced, except for the general call address. */
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static int i2c_check_addr_validity(unsigned addr, unsigned short flags)
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int i2c_check_addr_validity(unsigned addr, unsigned short flags)
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{
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if (flags & I2C_CLIENT_TEN) {
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/* 10-bit address, all values are valid */
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@ -1760,210 +1757,6 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
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up_read(&__i2c_board_lock);
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}
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/* OF support code */
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#if IS_ENABLED(CONFIG_OF)
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static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
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struct device_node *node)
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{
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struct i2c_client *result;
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struct i2c_board_info info = {};
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struct dev_archdata dev_ad = {};
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const __be32 *addr_be;
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u32 addr;
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int len;
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dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
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if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
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dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
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node->full_name);
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return ERR_PTR(-EINVAL);
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}
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addr_be = of_get_property(node, "reg", &len);
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if (!addr_be || (len < sizeof(*addr_be))) {
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dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
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node->full_name);
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return ERR_PTR(-EINVAL);
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}
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addr = be32_to_cpup(addr_be);
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if (addr & I2C_TEN_BIT_ADDRESS) {
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addr &= ~I2C_TEN_BIT_ADDRESS;
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info.flags |= I2C_CLIENT_TEN;
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}
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if (addr & I2C_OWN_SLAVE_ADDRESS) {
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addr &= ~I2C_OWN_SLAVE_ADDRESS;
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info.flags |= I2C_CLIENT_SLAVE;
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}
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if (i2c_check_addr_validity(addr, info.flags)) {
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dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
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addr, node->full_name);
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return ERR_PTR(-EINVAL);
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}
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info.addr = addr;
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info.of_node = of_node_get(node);
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info.archdata = &dev_ad;
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if (of_property_read_bool(node, "host-notify"))
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info.flags |= I2C_CLIENT_HOST_NOTIFY;
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if (of_get_property(node, "wakeup-source", NULL))
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info.flags |= I2C_CLIENT_WAKE;
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result = i2c_new_device(adap, &info);
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if (result == NULL) {
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dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
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node->full_name);
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of_node_put(node);
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return ERR_PTR(-EINVAL);
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}
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return result;
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}
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static void of_i2c_register_devices(struct i2c_adapter *adap)
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{
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struct device_node *bus, *node;
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struct i2c_client *client;
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/* Only register child devices if the adapter has a node pointer set */
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if (!adap->dev.of_node)
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return;
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dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
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bus = of_get_child_by_name(adap->dev.of_node, "i2c-bus");
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if (!bus)
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bus = of_node_get(adap->dev.of_node);
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for_each_available_child_of_node(bus, node) {
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if (of_node_test_and_set_flag(node, OF_POPULATED))
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continue;
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client = of_i2c_register_device(adap, node);
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if (IS_ERR(client)) {
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dev_warn(&adap->dev,
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"Failed to create I2C device for %s\n",
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node->full_name);
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of_node_clear_flag(node, OF_POPULATED);
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}
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}
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of_node_put(bus);
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}
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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/* must call put_device() when done with returned i2c_client device */
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struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
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{
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struct device *dev;
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struct i2c_client *client;
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dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
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if (!dev)
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return NULL;
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client = i2c_verify_client(dev);
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if (!client)
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put_device(dev);
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return client;
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}
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EXPORT_SYMBOL(of_find_i2c_device_by_node);
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/* must call put_device() when done with returned i2c_adapter device */
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struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
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{
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struct device *dev;
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struct i2c_adapter *adapter;
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dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
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if (!dev)
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return NULL;
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adapter = i2c_verify_adapter(dev);
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if (!adapter)
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put_device(dev);
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return adapter;
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}
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EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
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/* must call i2c_put_adapter() when done with returned i2c_adapter device */
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struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
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{
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struct i2c_adapter *adapter;
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adapter = of_find_i2c_adapter_by_node(node);
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if (!adapter)
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return NULL;
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if (!try_module_get(adapter->owner)) {
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put_device(&adapter->dev);
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adapter = NULL;
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}
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return adapter;
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}
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EXPORT_SYMBOL(of_get_i2c_adapter_by_node);
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static const struct of_device_id*
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i2c_of_match_device_sysfs(const struct of_device_id *matches,
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struct i2c_client *client)
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{
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const char *name;
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for (; matches->compatible[0]; matches++) {
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/*
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* Adding devices through the i2c sysfs interface provides us
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* a string to match which may be compatible with the device
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* tree compatible strings, however with no actual of_node the
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* of_match_device() will not match
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*/
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if (sysfs_streq(client->name, matches->compatible))
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return matches;
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name = strchr(matches->compatible, ',');
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if (!name)
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name = matches->compatible;
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else
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name++;
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if (sysfs_streq(client->name, name))
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return matches;
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}
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return NULL;
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}
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const struct of_device_id
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*i2c_of_match_device(const struct of_device_id *matches,
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struct i2c_client *client)
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{
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const struct of_device_id *match;
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if (!(client && matches))
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return NULL;
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match = of_match_device(matches, &client->dev);
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if (match)
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return match;
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return i2c_of_match_device_sysfs(matches, client);
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}
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EXPORT_SYMBOL_GPL(i2c_of_match_device);
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#else
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static void of_i2c_register_devices(struct i2c_adapter *adap) { }
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#endif /* CONFIG_OF */
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static int i2c_do_add_adapter(struct i2c_driver *driver,
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struct i2c_adapter *adap)
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{
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@ -2558,62 +2351,6 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
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}
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EXPORT_SYMBOL(i2c_clients_command);
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#if IS_ENABLED(CONFIG_OF_DYNAMIC)
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static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
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void *arg)
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{
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struct of_reconfig_data *rd = arg;
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struct i2c_adapter *adap;
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struct i2c_client *client;
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switch (of_reconfig_get_state_change(action, rd)) {
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case OF_RECONFIG_CHANGE_ADD:
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adap = of_find_i2c_adapter_by_node(rd->dn->parent);
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if (adap == NULL)
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return NOTIFY_OK; /* not for us */
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if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) {
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put_device(&adap->dev);
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return NOTIFY_OK;
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}
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client = of_i2c_register_device(adap, rd->dn);
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put_device(&adap->dev);
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if (IS_ERR(client)) {
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dev_err(&adap->dev, "failed to create client for '%s'\n",
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rd->dn->full_name);
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of_node_clear_flag(rd->dn, OF_POPULATED);
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return notifier_from_errno(PTR_ERR(client));
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}
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break;
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case OF_RECONFIG_CHANGE_REMOVE:
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/* already depopulated? */
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if (!of_node_check_flag(rd->dn, OF_POPULATED))
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return NOTIFY_OK;
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/* find our device by node */
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client = of_find_i2c_device_by_node(rd->dn);
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if (client == NULL)
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return NOTIFY_OK; /* no? not meant for us */
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/* unregister takes one ref away */
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i2c_unregister_device(client);
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/* and put the reference of the find */
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put_device(&client->dev);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block i2c_of_notifier = {
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.notifier_call = of_i2c_notify,
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};
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#else
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extern struct notifier_block i2c_of_notifier;
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#endif /* CONFIG_OF_DYNAMIC */
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static int __init i2c_init(void)
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{
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int retval;
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276
drivers/i2c/i2c-core-of.c
Normal file
276
drivers/i2c/i2c-core-of.c
Normal file
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@ -0,0 +1,276 @@
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/*
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* Linux I2C core OF support code
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*
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* Copyright (C) 2008 Jochen Friedrich <jochen@scram.de>
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* based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
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*
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* Copyright (C) 2013 Wolfram Sang <wsa@the-dreams.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <dt-bindings/i2c/i2c.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "i2c-core.h"
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static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
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struct device_node *node)
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{
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struct i2c_client *result;
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struct i2c_board_info info = {};
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struct dev_archdata dev_ad = {};
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const __be32 *addr_be;
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u32 addr;
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int len;
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dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
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if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
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dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
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node->full_name);
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return ERR_PTR(-EINVAL);
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}
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addr_be = of_get_property(node, "reg", &len);
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if (!addr_be || (len < sizeof(*addr_be))) {
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dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
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node->full_name);
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return ERR_PTR(-EINVAL);
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}
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addr = be32_to_cpup(addr_be);
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if (addr & I2C_TEN_BIT_ADDRESS) {
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addr &= ~I2C_TEN_BIT_ADDRESS;
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info.flags |= I2C_CLIENT_TEN;
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}
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if (addr & I2C_OWN_SLAVE_ADDRESS) {
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addr &= ~I2C_OWN_SLAVE_ADDRESS;
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info.flags |= I2C_CLIENT_SLAVE;
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}
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if (i2c_check_addr_validity(addr, info.flags)) {
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dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
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addr, node->full_name);
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return ERR_PTR(-EINVAL);
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}
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info.addr = addr;
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info.of_node = of_node_get(node);
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info.archdata = &dev_ad;
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if (of_property_read_bool(node, "host-notify"))
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info.flags |= I2C_CLIENT_HOST_NOTIFY;
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if (of_get_property(node, "wakeup-source", NULL))
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info.flags |= I2C_CLIENT_WAKE;
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result = i2c_new_device(adap, &info);
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if (result == NULL) {
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dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
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node->full_name);
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of_node_put(node);
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return ERR_PTR(-EINVAL);
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}
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return result;
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}
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void of_i2c_register_devices(struct i2c_adapter *adap)
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{
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struct device_node *bus, *node;
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struct i2c_client *client;
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/* Only register child devices if the adapter has a node pointer set */
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if (!adap->dev.of_node)
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return;
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dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
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bus = of_get_child_by_name(adap->dev.of_node, "i2c-bus");
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if (!bus)
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bus = of_node_get(adap->dev.of_node);
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for_each_available_child_of_node(bus, node) {
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if (of_node_test_and_set_flag(node, OF_POPULATED))
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continue;
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client = of_i2c_register_device(adap, node);
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if (IS_ERR(client)) {
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dev_warn(&adap->dev,
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"Failed to create I2C device for %s\n",
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node->full_name);
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of_node_clear_flag(node, OF_POPULATED);
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}
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}
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of_node_put(bus);
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}
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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/* must call put_device() when done with returned i2c_client device */
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struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
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{
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struct device *dev;
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struct i2c_client *client;
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dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
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if (!dev)
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return NULL;
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client = i2c_verify_client(dev);
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if (!client)
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put_device(dev);
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return client;
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}
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EXPORT_SYMBOL(of_find_i2c_device_by_node);
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/* must call put_device() when done with returned i2c_adapter device */
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struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
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{
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struct device *dev;
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struct i2c_adapter *adapter;
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|
||||
dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
|
||||
if (!dev)
|
||||
return NULL;
|
||||
|
||||
adapter = i2c_verify_adapter(dev);
|
||||
if (!adapter)
|
||||
put_device(dev);
|
||||
|
||||
return adapter;
|
||||
}
|
||||
EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
|
||||
|
||||
/* must call i2c_put_adapter() when done with returned i2c_adapter device */
|
||||
struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
|
||||
{
|
||||
struct i2c_adapter *adapter;
|
||||
|
||||
adapter = of_find_i2c_adapter_by_node(node);
|
||||
if (!adapter)
|
||||
return NULL;
|
||||
|
||||
if (!try_module_get(adapter->owner)) {
|
||||
put_device(&adapter->dev);
|
||||
adapter = NULL;
|
||||
}
|
||||
|
||||
return adapter;
|
||||
}
|
||||
EXPORT_SYMBOL(of_get_i2c_adapter_by_node);
|
||||
|
||||
static const struct of_device_id*
|
||||
i2c_of_match_device_sysfs(const struct of_device_id *matches,
|
||||
struct i2c_client *client)
|
||||
{
|
||||
const char *name;
|
||||
|
||||
for (; matches->compatible[0]; matches++) {
|
||||
/*
|
||||
* Adding devices through the i2c sysfs interface provides us
|
||||
* a string to match which may be compatible with the device
|
||||
* tree compatible strings, however with no actual of_node the
|
||||
* of_match_device() will not match
|
||||
*/
|
||||
if (sysfs_streq(client->name, matches->compatible))
|
||||
return matches;
|
||||
|
||||
name = strchr(matches->compatible, ',');
|
||||
if (!name)
|
||||
name = matches->compatible;
|
||||
else
|
||||
name++;
|
||||
|
||||
if (sysfs_streq(client->name, name))
|
||||
return matches;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
const struct of_device_id
|
||||
*i2c_of_match_device(const struct of_device_id *matches,
|
||||
struct i2c_client *client)
|
||||
{
|
||||
const struct of_device_id *match;
|
||||
|
||||
if (!(client && matches))
|
||||
return NULL;
|
||||
|
||||
match = of_match_device(matches, &client->dev);
|
||||
if (match)
|
||||
return match;
|
||||
|
||||
return i2c_of_match_device_sysfs(matches, client);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(i2c_of_match_device);
|
||||
|
||||
#if IS_ENABLED(CONFIG_OF_DYNAMIC)
|
||||
static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
|
||||
void *arg)
|
||||
{
|
||||
struct of_reconfig_data *rd = arg;
|
||||
struct i2c_adapter *adap;
|
||||
struct i2c_client *client;
|
||||
|
||||
switch (of_reconfig_get_state_change(action, rd)) {
|
||||
case OF_RECONFIG_CHANGE_ADD:
|
||||
adap = of_find_i2c_adapter_by_node(rd->dn->parent);
|
||||
if (adap == NULL)
|
||||
return NOTIFY_OK; /* not for us */
|
||||
|
||||
if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) {
|
||||
put_device(&adap->dev);
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
client = of_i2c_register_device(adap, rd->dn);
|
||||
put_device(&adap->dev);
|
||||
|
||||
if (IS_ERR(client)) {
|
||||
dev_err(&adap->dev, "failed to create client for '%s'\n",
|
||||
rd->dn->full_name);
|
||||
of_node_clear_flag(rd->dn, OF_POPULATED);
|
||||
return notifier_from_errno(PTR_ERR(client));
|
||||
}
|
||||
break;
|
||||
case OF_RECONFIG_CHANGE_REMOVE:
|
||||
/* already depopulated? */
|
||||
if (!of_node_check_flag(rd->dn, OF_POPULATED))
|
||||
return NOTIFY_OK;
|
||||
|
||||
/* find our device by node */
|
||||
client = of_find_i2c_device_by_node(rd->dn);
|
||||
if (client == NULL)
|
||||
return NOTIFY_OK; /* no? not meant for us */
|
||||
|
||||
/* unregister takes one ref away */
|
||||
i2c_unregister_device(client);
|
||||
|
||||
/* and put the reference of the find */
|
||||
put_device(&client->dev);
|
||||
break;
|
||||
}
|
||||
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
struct notifier_block i2c_of_notifier = {
|
||||
.notifier_call = of_i2c_notify,
|
||||
};
|
||||
#endif /* CONFIG_OF_DYNAMIC */
|
||||
|
|
@ -27,4 +27,12 @@ extern struct rw_semaphore __i2c_board_lock;
|
|||
extern struct list_head __i2c_board_list;
|
||||
extern int __i2c_first_dynamic_bus_num;
|
||||
|
||||
int i2c_check_addr_validity(unsigned addr, unsigned short flags);
|
||||
int i2c_check_7bit_addr_validity_strict(unsigned short addr);
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
void of_i2c_register_devices(struct i2c_adapter *adap);
|
||||
#else
|
||||
static inline void of_i2c_register_devices(struct i2c_adapter *adap) { }
|
||||
#endif
|
||||
extern struct notifier_block i2c_of_notifier;
|
||||
|
|
|
|||
Loading…
Reference in a new issue