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Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Browse source 
Pull i2c changes from Wolfram Sang:

 - an arbitration driver.  While the driver is quite simple, it caused
   discussion if we need additional arbitration on top of the one
   specified in the I2C standard.  Conclusion is that I accept a few
   generic mechanisms, but not very specific ones.

 - the core lost the detach_adapter() call.  It has no users anymore and
   was in the way for other cleanups.  attach_adapter() is sadly still
   there since there are users waiting to be converted.

 - the core gained a bus recovery infrastructure.  I2C defines a way to
   recover if the data line is stalled.  This mechanism is now in the
   core and drivers can now pass some data to make use of it.

 - bigger driver cleanups for designware, s3c2410

 - removing superfluous refcounting from drivers

 - removing Ben Dooks as second maintainer due to inactivity.  Thanks
   for all your work so far, Ben!

 - bugfixes, feature additions, devicetree fixups, simplifications...

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (38 commits)
  i2c: xiic: must always write 16-bit words to TX_FIFO
  i2c: octeon: use HZ in timeout value
  i2c: octeon: Fix i2c fail problem when a process is terminated by a signal
  i2c: designware-pci: drop superfluous {get|put}_device
  i2c: designware-plat: drop superfluous {get|put}_device
  i2c: davinci: drop superfluous {get|put}_device
  MAINTAINERS: Ben Dooks is inactive regarding I2C
  i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver
  i2c: at91: convert to dma_request_slave_channel_compat()
  i2c: mxs: do error checking and handling in PIO mode
  i2c: mxs: remove races in PIO code
  i2c-designware: switch to use runtime PM autosuspend
  i2c-designware: use usleep_range() in the busy-loop
  i2c-designware: enable/disable the controller properly
  i2c-designware: use dynamic adapter numbering on Lynxpoint
  i2c-designware-pci: use managed functions pcim_* and devm_*
  i2c-designware-pci: use dev_err() instead of printk()
  i2c-designware: move to managed functions (devm_*)
  i2c: remove CONFIG_HOTPLUG ifdefs
  i2c: s3c2410: Add SMBus emulation for block read
  ...
This commit is contained in:
Linus Torvalds 2013-05-02 14:38:53 -07:00
commit 99bece775f
42 changed files with 960 additions and 497 deletions
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2
include/linux/i2c-mux.h
View file

@ -42,7 +42,7 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
int (*deselect) (struct i2c_adapter *,
void *mux_dev, u32 chan_id));
int i2c_del_mux_adapter(struct i2c_adapter *adap);
void i2c_del_mux_adapter(struct i2c_adapter *adap);
#endif /* __KERNEL__ */

25
include/linux/i2c-tegra.h
View file

@ -1,25 +0,0 @@
/*
* drivers/i2c/busses/i2c-tegra.c
*
* Copyright (C) 2010 Google, Inc.
* Author: Colin Cross <ccross@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#ifndef _LINUX_I2C_TEGRA_H
#define _LINUX_I2C_TEGRA_H
struct tegra_i2c_platform_data {
unsigned long bus_clk_rate;
};
#endif /* _LINUX_I2C_TEGRA_H */

50
include/linux/i2c.h
View file

@ -125,7 +125,6 @@ extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
* struct i2c_driver - represent an I2C device driver
* @class: What kind of i2c device we instantiate (for detect)
* @attach_adapter: Callback for bus addition (deprecated)
* @detach_adapter: Callback for bus removal (deprecated)
* @probe: Callback for device binding
* @remove: Callback for device unbinding
* @shutdown: Callback for device shutdown
@ -162,12 +161,10 @@ extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
struct i2c_driver {
unsigned int class;
/* Notifies the driver that a new bus has appeared or is about to be
* removed. You should avoid using this, it will be removed in a
* near future.
/* Notifies the driver that a new bus has appeared. You should avoid
* using this, it will be removed in a near future.
*/
int (*attach_adapter)(struct i2c_adapter *) __deprecated;
int (*detach_adapter)(struct i2c_adapter *) __deprecated;
/* Standard driver model interfaces */
int (*probe)(struct i2c_client *, const struct i2c_device_id *);
@ -370,6 +367,45 @@ struct i2c_algorithm {
u32 (*functionality) (struct i2c_adapter *);
};
/**
* struct i2c_bus_recovery_info - I2C bus recovery information
* @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
* i2c_generic_scl_recovery() or i2c_generic_gpio_recovery().
* @get_scl: This gets current value of SCL line. Mandatory for generic SCL
* recovery. Used internally for generic GPIO recovery.
* @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used
* internally for generic GPIO recovery.
* @get_sda: This gets current value of SDA line. Optional for generic SCL
* recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO
* recovery.
* @prepare_recovery: This will be called before starting recovery. Platform may
* configure padmux here for SDA/SCL line or something else they want.
* @unprepare_recovery: This will be called after completing recovery. Platform
* may configure padmux here for SDA/SCL line or something else they want.
* @scl_gpio: gpio number of the SCL line. Only required for GPIO recovery.
* @sda_gpio: gpio number of the SDA line. Only required for GPIO recovery.
*/
struct i2c_bus_recovery_info {
int (*recover_bus)(struct i2c_adapter *);
int (*get_scl)(struct i2c_adapter *);
void (*set_scl)(struct i2c_adapter *, int val);
int (*get_sda)(struct i2c_adapter *);
void (*prepare_recovery)(struct i2c_bus_recovery_info *bri);
void (*unprepare_recovery)(struct i2c_bus_recovery_info *bri);
/* gpio recovery */
int scl_gpio;
int sda_gpio;
};
int i2c_recover_bus(struct i2c_adapter *adap);
/* Generic recovery routines */
int i2c_generic_gpio_recovery(struct i2c_adapter *adap);
int i2c_generic_scl_recovery(struct i2c_adapter *adap);
/*
* i2c_adapter is the structure used to identify a physical i2c bus along
* with the access algorithms necessary to access it.
@ -393,6 +429,8 @@ struct i2c_adapter {
struct mutex userspace_clients_lock;
struct list_head userspace_clients;
struct i2c_bus_recovery_info *bus_recovery_info;
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
@ -450,7 +488,7 @@ void i2c_unlock_adapter(struct i2c_adapter *);
*/
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
extern int i2c_add_adapter(struct i2c_adapter *);
extern int i2c_del_adapter(struct i2c_adapter *);
extern void i2c_del_adapter(struct i2c_adapter *);
extern int i2c_add_numbered_adapter(struct i2c_adapter *);
extern int i2c_register_driver(struct module *, struct i2c_driver *);