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i2c: i2c-smbus: add of_i2c_setup_smbus_alert 

This commit adds of_i2c_setup_smbus_alert which allows the smbalert
driver to be attached to an i2c adapter via the device tree.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Phil Reid 2017-08-24 17:31:03 +08:00 committed by Wolfram Sang
parent 3c0a60bee1
commit 69d17246ab
4 changed files with 42 additions and 3 deletions
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4
Documentation/devicetree/bindings/i2c/i2c.txt
View File

@ -59,8 +59,8 @@ wants to support one of the below features, it should adapt the bindings below.
interrupts used by the device.
- interrupt-names
"irq" and "wakeup" names are recognized by I2C core, other names are
left to individual drivers.
"irq", "wakeup" and "smbus_alert" names are recognized by I2C core,
other names are left to individual drivers.
- host-notify
device uses SMBus host notify protocol instead of interrupt line.

22
drivers/i2c/i2c-core-smbus.c
View File

@ -625,3 +625,25 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
return i2c_new_device(adapter, &ara_board_info);
}
EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);
#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
int of_i2c_setup_smbus_alert(struct i2c_adapter *adapter)
{
struct i2c_client *client;
int irq;
irq = of_property_match_string(adapter->dev.of_node, "interrupt-names",
"smbus_alert");
if (irq == -EINVAL || irq == -ENODATA)
return 0;
else if (irq < 0)
return irq;
client = i2c_setup_smbus_alert(adapter, NULL);
if (!client)
return -ENODEV;
return 0;
}
EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert);
#endif

8
drivers/i2c/i2c-smbus.c
View File

@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
@ -139,7 +140,14 @@ static int smbalert_probe(struct i2c_client *ara,
if (!alert)
return -ENOMEM;
if (setup) {
irq = setup->irq;
} else {
irq = of_irq_get_byname(adapter->dev.of_node, "smbus_alert");
if (irq <= 0)
return irq;
}
INIT_WORK(&alert->alert, smbalert_work);
alert->ara = ara;

9
include/linux/i2c-smbus.h
View File

@ -49,4 +49,13 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup);
int i2c_handle_smbus_alert(struct i2c_client *ara);
#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
int of_i2c_setup_smbus_alert(struct i2c_adapter *adap);
#else
static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
{
return 0;
}
#endif
#endif /* _LINUX_I2C_SMBUS_H */