From: Wolfram Sang <[email protected]> Not for upstream yet.
Signed-off-by: Wolfram Sang <[email protected]> --- drivers/i2c/i2c-core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/linux/i2c-slave.h | 28 ++++++++++++++++++++++++++++ include/linux/i2c.h | 5 +++++ 3 files changed, 75 insertions(+) create mode 100644 include/linux/i2c-slave.h diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 632057a44615..63ea70e5c274 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -2536,6 +2536,48 @@ trace: } EXPORT_SYMBOL(i2c_smbus_xfer); +int i2c_slave_register(struct i2c_client *client, + int (*slave_cb)(struct i2c_client *, enum i2c_slave_event, u8 *)) +{ + u16 addr = client->addr; + int ret; + + if (!slave_cb) + return -EINVAL; + + ret = i2c_check_addr_validity(addr); + if (ret) + return ret; + + if (!client->adapter->algo->reg_slave) + return -EOPNOTSUPP; + + client->slave_cb = slave_cb; + + ret = client->adapter->algo->reg_slave(client); + if (ret) + client->slave_cb = NULL; + + return ret; +} +EXPORT_SYMBOL_GPL(i2c_slave_register); + +int i2c_slave_unregister(struct i2c_client *client) +{ + int ret; + + if (!client->adapter->algo->unreg_slave) + return -EOPNOTSUPP; + + ret = client->adapter->algo->unreg_slave(client); + + if (ret == 0) + client->slave_cb = NULL; + + return ret; +} +EXPORT_SYMBOL_GPL(i2c_slave_unregister); + MODULE_AUTHOR("Simon G. Vogl <[email protected]>"); MODULE_DESCRIPTION("I2C-Bus main module"); MODULE_LICENSE("GPL"); diff --git a/include/linux/i2c-slave.h b/include/linux/i2c-slave.h new file mode 100644 index 000000000000..ddc9493cb5e7 --- /dev/null +++ b/include/linux/i2c-slave.h @@ -0,0 +1,28 @@ +/* + * i2c-slave.h - Linux I2C slave support + * + * Copyright (C) 2014 by Wolfram Sang + * + * 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; version 2 of the License. + */ + +#include <linux/i2c.h> + +#ifndef _LINUX_I2C_SLAVE_H +#define _LINUX_I2C_SLAVE_H + +enum i2c_slave_event { + I2C_SLAVE_REQ_READ, + I2C_SLAVE_REQ_WRITE, + I2C_SLAVE_STOP, +}; + +extern int i2c_slave_register(struct i2c_client *client, int (*slave_cb)(struct i2c_client *, enum i2c_slave_event, u8 *)); +extern int i2c_slave_unregister(struct i2c_client *client); + +#define i2c_slave_event(__client, __event, __value) \ + client->slave_cb(__client, __event, __value) + +#endif diff --git a/include/linux/i2c.h b/include/linux/i2c.h index a95efeb53a8b..8541aa6b0178 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -46,6 +46,7 @@ struct i2c_client; struct i2c_driver; union i2c_smbus_data; struct i2c_board_info; +enum i2c_slave_event; struct module; @@ -224,6 +225,7 @@ struct i2c_client { struct device dev; /* the device structure */ int irq; /* irq issued by device */ struct list_head detected; + int (*slave_cb)(struct i2c_client *, enum i2c_slave_event, u8 *); }; #define to_i2c_client(d) container_of(d, struct i2c_client, dev) @@ -377,6 +379,9 @@ struct i2c_algorithm { /* To determine what the adapter supports */ u32 (*functionality) (struct i2c_adapter *); + + int (*reg_slave)(struct i2c_client *client); + int (*unreg_slave)(struct i2c_client *client); }; /** -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
