summaryrefslogtreecommitdiff
path: root/include/linux/i2c.h
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2017-04-05 00:03:33 +0200
committerWolfram Sang <wsa@the-dreams.de>2017-04-16 22:02:02 +0200
commit605f8fc2244236f8d6bf15bcc0586644af3a32e7 (patch)
tree5f4bae0c80dc3415026484aff190a8a74ad05d32 /include/linux/i2c.h
parent417f784379c2b582d96bde2b438dc1ecb0abd7c3 (diff)
i2c: core: Add new i2c_acpi_new_device helper function
By default the i2c subsys creates an i2c-client for the first I2cSerialBus resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus resources and we may want to instantiate i2c-clients for the others. This commit adds a new i2c_acpi_new_device function which can be used to create an i2c-client for any I2cSerialBus resource of an acpi_device. Note that the other resources may even be on a different i2c bus, so just retrieving the client address is not enough. Here is an example DSDT excerpt from such a device: Device (WIDR) { Name (_HID, "INT33FE" /* XPOWER Battery Device */) Name (_CID, "INT33FE" /* XPOWER Battery Device */) Name (_DDN, "WC PMIC Battery Device") <snip> Name (RBUF, ResourceTemplate () { I2cSerialBusV2 (0x005E, ControllerInitiated, 0x000186A0, AddressingMode7Bit, "\\_SB.PCI0.I2C7", 0x00, ResourceConsumer, , Exclusive, ) I2cSerialBusV2 (0x0036, ControllerInitiated, 0x000186A0, AddressingMode7Bit, "\\_SB.PCI0.I2C1", 0x00, ResourceConsumer, , Exclusive, ) I2cSerialBusV2 (0x0022, ControllerInitiated, 0x00061A80, AddressingMode7Bit, "\\_SB.PCI0.I2C1", 0x00, ResourceConsumer, , Exclusive, ) I2cSerialBusV2 (0x0054, ControllerInitiated, 0x00061A80, AddressingMode7Bit, "\\_SB.PCI0.I2C1", 0x00, ResourceConsumer, , Exclusive, ) GpioInt (Level, ActiveLow, Exclusive, PullNone, 0x0000, "\\_SB.PCI0.I2C7.PMI5", 0x00, ResourceConsumer, , ) { // Pin list 0x0012 } GpioInt (Edge, ActiveLow, ExclusiveAndWake, PullNone, 0x0000, "\\_SB.GPO1", 0x00, ResourceConsumer, , ) { // Pin list 0x0005 } GpioInt (Level, ActiveLow, Exclusive, PullNone, 0x0000, "\\_SB.PCI0.I2C7.PMI5", 0x00, ResourceConsumer, , ) { // Pin list 0x0013 } }) Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings { Return (RBUF) /* \_SB_.PCI0.I2C7.WIDR.RBUF */ } <snip> } Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 6b183521c616..53fa50fc63fb 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -824,11 +824,18 @@ static inline const struct of_device_id
#if IS_ENABLED(CONFIG_ACPI)
u32 i2c_acpi_find_bus_speed(struct device *dev);
+struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
+ struct i2c_board_info *info);
#else
static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
{
return 0;
}
+static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
+ int index, struct i2c_board_info *info)
+{
+ return NULL;
+}
#endif /* CONFIG_ACPI */
#endif /* _LINUX_I2C_H */