Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 65b4eae..1361637 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -1,31 +1,16 @@
-/* ------------------------------------------------------------------------- */
-/* */
-/* i2c.h - definitions for the i2c-bus interface */
-/* */
-/* ------------------------------------------------------------------------- */
-/* Copyright (C) 1995-2000 Simon G. Vogl
-
- 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.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- MA 02110-1301 USA. */
-/* ------------------------------------------------------------------------- */
-
-/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
- Frodo Looijaard <frodol@dds.nl> */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * i2c.h - definitions for the Linux i2c bus interface
+ * Copyright (C) 1995-2000 Simon G. Vogl
+ * Copyright (C) 2013-2019 Wolfram Sang <wsa@the-dreams.de>
+ *
+ * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
+ * Frodo Looijaard <frodol@dds.nl>
+ */
#ifndef _LINUX_I2C_H
#define _LINUX_I2C_H
+#include <linux/acpi.h> /* for acpi_handle */
#include <linux/mod_devicetable.h>
#include <linux/device.h> /* for struct device */
#include <linux/sched.h> /* for completion */
@@ -51,7 +36,8 @@
union i2c_smbus_data;
struct i2c_board_info;
enum i2c_slave_event;
-typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *);
+typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
+ enum i2c_slave_event event, u8 *val);
struct module;
struct property_entry;
@@ -268,16 +254,16 @@
unsigned int class;
/* Standard driver model interfaces */
- int (*probe)(struct i2c_client *, const struct i2c_device_id *);
- int (*remove)(struct i2c_client *);
+ int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
+ int (*remove)(struct i2c_client *client);
/* New driver model interface to aid the seamless removal of the
* current probe()'s, more commonly unused than used second parameter.
*/
- int (*probe_new)(struct i2c_client *);
+ int (*probe_new)(struct i2c_client *client);
/* driver model interfaces that don't relate to enumeration */
- void (*shutdown)(struct i2c_client *);
+ void (*shutdown)(struct i2c_client *client);
/* Alert callback, for example for the SMBus alert protocol.
* The format and meaning of the data value depends on the protocol.
@@ -286,7 +272,7 @@
* For the SMBus Host Notify protocol, the data corresponds to the
* 16-bit payload data reported by the slave device acting as master.
*/
- void (*alert)(struct i2c_client *, enum i2c_alert_protocol protocol,
+ void (*alert)(struct i2c_client *client, enum i2c_alert_protocol protocol,
unsigned int data);
/* a ioctl like command that can be used to perform specific functions
@@ -298,7 +284,7 @@
const struct i2c_device_id *id_table;
/* Device detection callback for automatic device creation */
- int (*detect)(struct i2c_client *, struct i2c_board_info *);
+ int (*detect)(struct i2c_client *client, struct i2c_board_info *info);
const unsigned short *address_list;
struct list_head clients;
@@ -308,8 +294,7 @@
/**
* struct i2c_client - represent an I2C slave device
- * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
- * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
+ * @flags: see I2C_CLIENT_* for possible flags
* @addr: Address used on the I2C bus connected to the parent adapter.
* @name: Indicates the type of the device, usually a chip name that's
* generic enough to hide second-sourcing and compatible revisions.
@@ -327,12 +312,22 @@
*/
struct i2c_client {
unsigned short flags; /* div., see below */
+#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
+#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
+ /* Must equal I2C_M_TEN below */
+#define I2C_CLIENT_SLAVE 0x20 /* we are the slave */
+#define I2C_CLIENT_HOST_NOTIFY 0x40 /* We want to use I2C host notify */
+#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
+#define I2C_CLIENT_SCCB 0x9000 /* Use Omnivision SCCB protocol */
+ /* Must match I2C_M_STOP|IGNORE_NAK */
+
unsigned short addr; /* chip address - NOTE: 7bit */
/* addresses are stored in the */
/* _LOWER_ 7 bits */
char name[I2C_NAME_SIZE];
struct i2c_adapter *adapter; /* the adapter we sit on */
struct device dev; /* the device structure */
+ int init_irq; /* irq set at initialization */
int irq; /* irq issued by device */
struct list_head detected;
#if IS_ENABLED(CONFIG_I2C_SLAVE)
@@ -447,6 +442,9 @@
extern struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
+extern struct i2c_client *
+i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
+
/* If you don't know the exact address of an I2C device, use this variant
* instead, which can probe for device presence in a list of possible
* addresses. The "probe" callback function is optional. If it is provided,
@@ -457,10 +455,10 @@
i2c_new_probed_device(struct i2c_adapter *adap,
struct i2c_board_info *info,
unsigned short const *addr_list,
- int (*probe)(struct i2c_adapter *, unsigned short addr));
+ int (*probe)(struct i2c_adapter *adap, unsigned short addr));
/* Common custom probe functions */
-extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
+extern int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr);
/* For devices that use several addresses, use i2c_new_dummy() to make
* client handles for the extra addresses.
@@ -469,11 +467,17 @@
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
extern struct i2c_client *
-i2c_new_secondary_device(struct i2c_client *client,
+i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address);
+
+extern struct i2c_client *
+devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address);
+
+extern struct i2c_client *
+i2c_new_ancillary_device(struct i2c_client *client,
const char *name,
u16 default_addr);
-extern void i2c_unregister_device(struct i2c_client *);
+extern void i2c_unregister_device(struct i2c_client *client);
#endif /* I2C */
/* Mainboard arch_initcall() code should register all its I2C devices.
@@ -498,9 +502,13 @@
* @master_xfer: Issue a set of i2c transactions to the given I2C adapter
* defined by the msgs array, with num messages available to transfer via
* the adapter specified by adap.
+ * @master_xfer_atomic: same as @master_xfer. Yet, only using atomic context
+ * so e.g. PMICs can be accessed very late before shutdown. Optional.
* @smbus_xfer: Issue smbus transactions to the given I2C adapter. If this
* is not present, then the bus layer will try and convert the SMBus calls
* into I2C transfers instead.
+ * @smbus_xfer_atomic: same as @smbus_xfer. Yet, only using atomic context
+ * so e.g. PMICs can be accessed very late before shutdown. Optional.
* @functionality: Return the flags that this algorithm/adapter pair supports
* from the I2C_FUNC_* flags.
* @reg_slave: Register given client to I2C slave mode of this adapter
@@ -511,25 +519,33 @@
* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
* to name two of the most common.
*
- * The return codes from the @master_xfer field should indicate the type of
- * error code that occurred during the transfer, as documented in the kernel
- * Documentation file Documentation/i2c/fault-codes.
+ * The return codes from the @master_xfer{_atomic} fields should indicate the
+ * type of error code that occurred during the transfer, as documented in the
+ * Kernel Documentation file Documentation/i2c/fault-codes.rst.
*/
struct i2c_algorithm {
- /* If an adapter algorithm can't do I2C-level access, set master_xfer
- to NULL. If an adapter algorithm can do SMBus access, set
- smbus_xfer. If set to NULL, the SMBus protocol is simulated
- using common I2C messages */
- /* master_xfer should return the number of messages successfully
- processed, or a negative value on error */
+ /*
+ * If an adapter algorithm can't do I2C-level access, set master_xfer
+ * to NULL. If an adapter algorithm can do SMBus access, set
+ * smbus_xfer. If set to NULL, the SMBus protocol is simulated
+ * using common I2C messages.
+ *
+ * master_xfer should return the number of messages successfully
+ * processed, or a negative value on error
+ */
int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
int num);
- int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size, union i2c_smbus_data *data);
+ int (*master_xfer_atomic)(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num);
+ int (*smbus_xfer)(struct i2c_adapter *adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data *data);
+ int (*smbus_xfer_atomic)(struct i2c_adapter *adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data *data);
/* To determine what the adapter supports */
- u32 (*functionality) (struct i2c_adapter *);
+ u32 (*functionality)(struct i2c_adapter *adap);
#if IS_ENABLED(CONFIG_I2C_SLAVE)
int (*reg_slave)(struct i2c_client *client);
@@ -546,9 +562,9 @@
* The main operations are wrapped by i2c_lock_bus and i2c_unlock_bus.
*/
struct i2c_lock_operations {
- void (*lock_bus)(struct i2c_adapter *, unsigned int flags);
- int (*trylock_bus)(struct i2c_adapter *, unsigned int flags);
- void (*unlock_bus)(struct i2c_adapter *, unsigned int flags);
+ void (*lock_bus)(struct i2c_adapter *adapter, unsigned int flags);
+ int (*trylock_bus)(struct i2c_adapter *adapter, unsigned int flags);
+ void (*unlock_bus)(struct i2c_adapter *adapter, unsigned int flags);
};
/**
@@ -680,6 +696,9 @@
int timeout; /* in jiffies */
int retries;
struct device dev; /* the adapter device */
+ unsigned long locked_flags; /* owned by the I2C core */
+#define I2C_ALF_IS_SUSPENDED 0
+#define I2C_ALF_SUSPEND_REPORTED 1
int nr;
char name[48];
@@ -695,14 +714,14 @@
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
-static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
+static inline void *i2c_get_adapdata(const struct i2c_adapter *adap)
{
- return dev_get_drvdata(&dev->dev);
+ return dev_get_drvdata(&adap->dev);
}
-static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
+static inline void i2c_set_adapdata(struct i2c_adapter *adap, void *data)
{
- dev_set_drvdata(&dev->dev, data);
+ dev_set_drvdata(&adap->dev, data);
}
static inline struct i2c_adapter *
@@ -718,7 +737,7 @@
return NULL;
}
-int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
+int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data));
/* Adapter locking functions, exported for shared pin cases */
#define I2C_LOCK_ROOT_ADAPTER BIT(0)
@@ -762,15 +781,37 @@
adapter->lock_ops->unlock_bus(adapter, flags);
}
-/*flags for the client struct: */
-#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
-#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
- /* Must equal I2C_M_TEN below */
-#define I2C_CLIENT_SLAVE 0x20 /* we are the slave */
-#define I2C_CLIENT_HOST_NOTIFY 0x40 /* We want to use I2C host notify */
-#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
-#define I2C_CLIENT_SCCB 0x9000 /* Use Omnivision SCCB protocol */
- /* Must match I2C_M_STOP|IGNORE_NAK */
+/**
+ * i2c_mark_adapter_suspended - Report suspended state of the adapter to the core
+ * @adap: Adapter to mark as suspended
+ *
+ * When using this helper to mark an adapter as suspended, the core will reject
+ * further transfers to this adapter. The usage of this helper is optional but
+ * recommended for devices having distinct handlers for system suspend and
+ * runtime suspend. More complex devices are free to implement custom solutions
+ * to reject transfers when suspended.
+ */
+static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap)
+{
+ i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+ set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
+ i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+}
+
+/**
+ * i2c_mark_adapter_resumed - Report resumed state of the adapter to the core
+ * @adap: Adapter to mark as resumed
+ *
+ * When using this helper to mark an adapter as resumed, the core will allow
+ * further transfers to this adapter. See also further notes to
+ * @i2c_mark_adapter_suspended().
+ */
+static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap)
+{
+ i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+ clear_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
+ i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+}
/* i2c adapter classes (bitmask) */
#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
@@ -792,12 +833,12 @@
/* administration...
*/
#if IS_ENABLED(CONFIG_I2C)
-extern int i2c_add_adapter(struct i2c_adapter *);
-extern void i2c_del_adapter(struct i2c_adapter *);
-extern int i2c_add_numbered_adapter(struct i2c_adapter *);
+extern int i2c_add_adapter(struct i2c_adapter *adap);
+extern void i2c_del_adapter(struct i2c_adapter *adap);
+extern int i2c_add_numbered_adapter(struct i2c_adapter *adap);
-extern int i2c_register_driver(struct module *, struct i2c_driver *);
-extern void i2c_del_driver(struct i2c_driver *);
+extern int i2c_register_driver(struct module *owner, struct i2c_driver *driver);
+extern void i2c_del_driver(struct i2c_driver *driver);
/* use a define to avoid include chaining to get THIS_MODULE */
#define i2c_add_driver(driver) \
@@ -933,11 +974,22 @@
#endif /* CONFIG_OF */
+struct acpi_resource;
+struct acpi_resource_i2c_serialbus;
+
#if IS_ENABLED(CONFIG_ACPI)
+bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+ struct acpi_resource_i2c_serialbus **i2c);
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);
+struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
#else
+static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+ struct acpi_resource_i2c_serialbus **i2c)
+{
+ return false;
+}
static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
{
return 0;
@@ -947,6 +999,10 @@
{
return NULL;
}
+static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
+{
+ return NULL;
+}
#endif /* CONFIG_ACPI */
#endif /* _LINUX_I2C_H */