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i2c: acpi: export i2c_acpi_find_adapter_by_handle 

This allows drivers to lookup i2c adapters on ACPI based systems similar to
of_get_i2c_adapter_by_node() with DT based systems.

Signed-off-by: Ruslan Babayev <ruslan@babayev.com>
Cc: xe-linux-external@cisco.com
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ruslan Babayev 2019-05-28 16:02:32 -07:00 committed by David S. Miller
parent 517f4c49aa
commit 1e91a2e5d8
2 changed files with 8 additions and 1 deletions
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3
drivers/i2c/i2c-core-acpi.c
View File

@ -337,7 +337,7 @@ static int i2c_acpi_find_match_device(struct device *dev, void *data)
return ACPI_COMPANION(dev) == data; return ACPI_COMPANION(dev) == data;
} }
static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
{ {
struct device *dev; struct device *dev;
@ -345,6 +345,7 @@ static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
i2c_acpi_find_match_adapter); i2c_acpi_find_match_adapter);
return dev ? i2c_verify_adapter(dev) : NULL; return dev ? i2c_verify_adapter(dev) : NULL;
} }
EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
{ {

6
include/linux/i2c.h
View File

@ -14,6 +14,7 @@
#ifndef _LINUX_I2C_H #ifndef _LINUX_I2C_H
#define _LINUX_I2C_H #define _LINUX_I2C_H
#include <linux/acpi.h> /* for acpi_handle */
#include <linux/mod_devicetable.h> #include <linux/mod_devicetable.h>
#include <linux/device.h> /* for struct device */ #include <linux/device.h> /* for struct device */
#include <linux/sched.h> /* for completion */ #include <linux/sched.h> /* for completion */
@ -981,6 +982,7 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
u32 i2c_acpi_find_bus_speed(struct device *dev); u32 i2c_acpi_find_bus_speed(struct device *dev);
struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
struct i2c_board_info *info); struct i2c_board_info *info);
struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
#else #else
static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
struct acpi_resource_i2c_serialbus **i2c) struct acpi_resource_i2c_serialbus **i2c)
@ -996,6 +998,10 @@ static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
{ {
return NULL; return NULL;
} }
static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
{
return NULL;
}
#endif /* CONFIG_ACPI */ #endif /* CONFIG_ACPI */
#endif /* _LINUX_I2C_H */ #endif /* _LINUX_I2C_H */