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i2c: break out slave 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>
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Wolfram Sang
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May 31, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * Linux I2C core slave support code | ||
| * | ||
| * Copyright (C) 2014 by Wolfram Sang <wsa@sang-engineering.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License as published by the Free | ||
| * Software Foundation; either version 2 of the License, or (at your option) | ||
| * any later version. | ||
| */ | ||
|
|
||
| #include <dt-bindings/i2c/i2c.h> | ||
| #include <linux/acpi.h> | ||
| #include <linux/device.h> | ||
| #include <linux/err.h> | ||
| #include <linux/i2c.h> | ||
| #include <linux/of.h> | ||
|
|
||
| #include "i2c-core.h" | ||
|
|
||
| int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb) | ||
| { | ||
| int ret; | ||
|
|
||
| if (!client || !slave_cb) { | ||
| WARN(1, "insufficient data\n"); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| if (!(client->flags & I2C_CLIENT_SLAVE)) | ||
| dev_warn(&client->dev, "%s: client slave flag not set. You might see address collisions\n", | ||
| __func__); | ||
|
|
||
| if (!(client->flags & I2C_CLIENT_TEN)) { | ||
| /* Enforce stricter address checking */ | ||
| ret = i2c_check_7bit_addr_validity_strict(client->addr); | ||
| if (ret) { | ||
| dev_err(&client->dev, "%s: invalid address\n", __func__); | ||
| return ret; | ||
| } | ||
| } | ||
|
|
||
| if (!client->adapter->algo->reg_slave) { | ||
| dev_err(&client->dev, "%s: not supported by adapter\n", __func__); | ||
| return -EOPNOTSUPP; | ||
| } | ||
|
|
||
| client->slave_cb = slave_cb; | ||
|
|
||
| i2c_lock_adapter(client->adapter); | ||
| ret = client->adapter->algo->reg_slave(client); | ||
| i2c_unlock_adapter(client->adapter); | ||
|
|
||
| if (ret) { | ||
| client->slave_cb = NULL; | ||
| dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); | ||
| } | ||
|
|
||
| return ret; | ||
| } | ||
| EXPORT_SYMBOL_GPL(i2c_slave_register); | ||
|
|
||
| int i2c_slave_unregister(struct i2c_client *client) | ||
| { | ||
| int ret; | ||
|
|
||
| if (!client->adapter->algo->unreg_slave) { | ||
| dev_err(&client->dev, "%s: not supported by adapter\n", __func__); | ||
| return -EOPNOTSUPP; | ||
| } | ||
|
|
||
| i2c_lock_adapter(client->adapter); | ||
| ret = client->adapter->algo->unreg_slave(client); | ||
| i2c_unlock_adapter(client->adapter); | ||
|
|
||
| if (ret == 0) | ||
| client->slave_cb = NULL; | ||
| else | ||
| dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); | ||
|
|
||
| return ret; | ||
| } | ||
| EXPORT_SYMBOL_GPL(i2c_slave_unregister); | ||
|
|
||
| /** | ||
| * i2c_detect_slave_mode - detect operation mode | ||
| * @dev: The device owning the bus | ||
| * | ||
| * This checks the device nodes for an I2C slave by checking the address | ||
| * used in the reg property. If the address match the I2C_OWN_SLAVE_ADDRESS | ||
| * flag this means the device is configured to act as a I2C slave and it will | ||
| * be listening at that address. | ||
| * | ||
| * Returns true if an I2C own slave address is detected, otherwise returns | ||
| * false. | ||
| */ | ||
| bool i2c_detect_slave_mode(struct device *dev) | ||
| { | ||
| if (IS_BUILTIN(CONFIG_OF) && dev->of_node) { | ||
| struct device_node *child; | ||
| u32 reg; | ||
|
|
||
| for_each_child_of_node(dev->of_node, child) { | ||
| of_property_read_u32(child, "reg", ®); | ||
| if (reg & I2C_OWN_SLAVE_ADDRESS) { | ||
| of_node_put(child); | ||
| return true; | ||
| } | ||
| } | ||
| } else if (IS_BUILTIN(CONFIG_ACPI) && ACPI_HANDLE(dev)) { | ||
| dev_dbg(dev, "ACPI slave is not supported yet\n"); | ||
| } | ||
| return false; | ||
| } | ||
| EXPORT_SYMBOL_GPL(i2c_detect_slave_mode); |
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