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Revert "Staging: android: delete android drivers"

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This reverts commit b0a0ccfad8.
This commit is contained in:
Arve Hjønnevåg 2010-02-12 20:32:37 -08:00 committed by Colin Cross
parent 2c53b436a3
commit 594d1fd552
15 changed files with 5807 additions and 0 deletions
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2
drivers/staging/Kconfig
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@ -70,6 +70,8 @@ source "drivers/staging/rts_pstor/Kconfig"
source "drivers/staging/frontier/Kconfig"
source "drivers/staging/android/Kconfig"
source "drivers/staging/pohmelfs/Kconfig"
source "drivers/staging/phison/Kconfig"

1
drivers/staging/Makefile
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@ -29,6 +29,7 @@ obj-$(CONFIG_R8712U) += rtl8712/
obj-$(CONFIG_RTS_PSTOR) += rts_pstor/
obj-$(CONFIG_SPECTRA) += spectra/
obj-$(CONFIG_TRANZPORT) += frontier/
obj-$(CONFIG_ANDROID) += android/
obj-$(CONFIG_POHMELFS) += pohmelfs/
obj-$(CONFIG_IDE_PHISON) += phison/
obj-$(CONFIG_LINE6_USB) += line6/

96
drivers/staging/android/Kconfig Normal file
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@ -0,0 +1,96 @@
menu "Android"
config ANDROID
bool "Android Drivers"
depends on BROKEN
default N
---help---
Enable support for various drivers needed on the Android platform
if ANDROID
config ANDROID_BINDER_IPC
bool "Android Binder IPC Driver"
default n
config ANDROID_LOGGER
tristate "Android log driver"
default n
config ANDROID_RAM_CONSOLE
bool "Android RAM buffer console"
default n
config ANDROID_RAM_CONSOLE_ENABLE_VERBOSE
bool "Enable verbose console messages on Android RAM console"
default y
depends on ANDROID_RAM_CONSOLE
menuconfig ANDROID_RAM_CONSOLE_ERROR_CORRECTION
bool "Android RAM Console Enable error correction"
default n
depends on ANDROID_RAM_CONSOLE
depends on !ANDROID_RAM_CONSOLE_EARLY_INIT
select REED_SOLOMON
select REED_SOLOMON_ENC8
select REED_SOLOMON_DEC8
if ANDROID_RAM_CONSOLE_ERROR_CORRECTION
config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_DATA_SIZE
int "Android RAM Console Data data size"
default 128
help
Must be a power of 2.
config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_ECC_SIZE
int "Android RAM Console ECC size"
default 16
config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE
int "Android RAM Console Symbol size"
default 8
config ANDROID_RAM_CONSOLE_ERROR_CORRECTION_POLYNOMIAL
hex "Android RAM Console Polynomial"
default 0x19 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 4)
default 0x29 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 5)
default 0x61 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 6)
default 0x89 if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 7)
default 0x11d if (ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE = 8)
endif # ANDROID_RAM_CONSOLE_ERROR_CORRECTION
config ANDROID_RAM_CONSOLE_EARLY_INIT
bool "Start Android RAM console early"
default n
depends on ANDROID_RAM_CONSOLE
config ANDROID_RAM_CONSOLE_EARLY_ADDR
hex "Android RAM console virtual address"
default 0
depends on ANDROID_RAM_CONSOLE_EARLY_INIT
config ANDROID_RAM_CONSOLE_EARLY_SIZE
hex "Android RAM console buffer size"
default 0
depends on ANDROID_RAM_CONSOLE_EARLY_INIT
config ANDROID_TIMED_OUTPUT
bool "Timed output class driver"
default y
config ANDROID_TIMED_GPIO
tristate "Android timed gpio driver"
depends on GENERIC_GPIO && ANDROID_TIMED_OUTPUT
default n
config ANDROID_LOW_MEMORY_KILLER
bool "Android Low Memory Killer"
default N
---help---
Register processes to be killed when memory is low
endif # if ANDROID
endmenu

6
drivers/staging/android/Makefile Normal file
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@ -0,0 +1,6 @@
obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o
obj-$(CONFIG_ANDROID_LOGGER) += logger.o
obj-$(CONFIG_ANDROID_RAM_CONSOLE) += ram_console.o
obj-$(CONFIG_ANDROID_TIMED_OUTPUT) += timed_output.o
obj-$(CONFIG_ANDROID_TIMED_GPIO) += timed_gpio.o
obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER) += lowmemorykiller.o

10
drivers/staging/android/TODO Normal file
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@ -0,0 +1,10 @@
TODO:
- checkpatch.pl cleanups
- sparse fixes
- rename files to be not so "generic"
- make sure things build as modules properly
- add proper arch dependancies as needed
- audit userspace interfaces to make sure they are sane
Please send patches to Greg Kroah-Hartman <greg@kroah.com> and Cc:
Brian Swetland <swetland@google.com>

3767
drivers/staging/android/binder.c Normal file
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File diff suppressed because it is too large Load Diff

330
drivers/staging/android/binder.h Normal file
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@ -0,0 +1,330 @@
/*
* Copyright (C) 2008 Google, Inc.
*
* Based on, but no longer compatible with, the original
* OpenBinder.org binder driver interface, which is:
*
* Copyright (c) 2005 Palmsource, Inc.
*
* 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_BINDER_H
#define _LINUX_BINDER_H
#include <linux/ioctl.h>
#define B_PACK_CHARS(c1, c2, c3, c4) \
((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
#define B_TYPE_LARGE 0x85
enum {
BINDER_TYPE_BINDER = B_PACK_CHARS('s', 'b', '*', B_TYPE_LARGE),
BINDER_TYPE_WEAK_BINDER = B_PACK_CHARS('w', 'b', '*', B_TYPE_LARGE),
BINDER_TYPE_HANDLE = B_PACK_CHARS('s', 'h', '*', B_TYPE_LARGE),
BINDER_TYPE_WEAK_HANDLE = B_PACK_CHARS('w', 'h', '*', B_TYPE_LARGE),
BINDER_TYPE_FD = B_PACK_CHARS('f', 'd', '*', B_TYPE_LARGE),
};
enum {
FLAT_BINDER_FLAG_PRIORITY_MASK = 0xff,
FLAT_BINDER_FLAG_ACCEPTS_FDS = 0x100,
};
/*
* This is the flattened representation of a Binder object for transfer
* between processes. The 'offsets' supplied as part of a binder transaction
* contains offsets into the data where these structures occur. The Binder
* driver takes care of re-writing the structure type and data as it moves
* between processes.
*/
struct flat_binder_object {
/* 8 bytes for large_flat_header. */
unsigned long type;
unsigned long flags;
/* 8 bytes of data. */
union {
void *binder; /* local object */
signed long handle; /* remote object */
};
/* extra data associated with local object */
void *cookie;
};
/*
* On 64-bit platforms where user code may run in 32-bits the driver must
* translate the buffer (and local binder) addresses apropriately.
*/
struct binder_write_read {
signed long write_size; /* bytes to write */
signed long write_consumed; /* bytes consumed by driver */
unsigned long write_buffer;
signed long read_size; /* bytes to read */
signed long read_consumed; /* bytes consumed by driver */
unsigned long read_buffer;
};
/* Use with BINDER_VERSION, driver fills in fields. */
struct binder_version {
/* driver protocol version -- increment with incompatible change */
signed long protocol_version;
};
/* This is the current protocol version. */
#define BINDER_CURRENT_PROTOCOL_VERSION 7
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, int64_t)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, size_t)
#define BINDER_SET_IDLE_PRIORITY _IOW('b', 6, int)
#define BINDER_SET_CONTEXT_MGR _IOW('b', 7, int)
#define BINDER_THREAD_EXIT _IOW('b', 8, int)
#define BINDER_VERSION _IOWR('b', 9, struct binder_version)
/*
* NOTE: Two special error codes you should check for when calling
* in to the driver are:
*
* EINTR -- The operation has been interupted. This should be
* handled by retrying the ioctl() until a different error code
* is returned.
*
* ECONNREFUSED -- The driver is no longer accepting operations
* from your process. That is, the process is being destroyed.
* You should handle this by exiting from your process. Note
* that once this error code is returned, all further calls to
* the driver from any thread will return this same code.
*/
enum transaction_flags {
TF_ONE_WAY = 0x01, /* this is a one-way call: async, no return */
TF_ROOT_OBJECT = 0x04, /* contents are the component's root object */
TF_STATUS_CODE = 0x08, /* contents are a 32-bit status code */
TF_ACCEPT_FDS = 0x10, /* allow replies with file descriptors */
};
struct binder_transaction_data {
/* The first two are only used for bcTRANSACTION and brTRANSACTION,
* identifying the target and contents of the transaction.
*/
union {
size_t handle; /* target descriptor of command transaction */
void *ptr; /* target descriptor of return transaction */
} target;
void *cookie; /* target object cookie */
unsigned int code; /* transaction command */
/* General information about the transaction. */
unsigned int flags;
pid_t sender_pid;
uid_t sender_euid;
size_t data_size; /* number of bytes of data */
size_t offsets_size; /* number of bytes of offsets */
/* If this transaction is inline, the data immediately
* follows here; otherwise, it ends with a pointer to
* the data buffer.
*/
union {
struct {
/* transaction data */
const void *buffer;
/* offsets from buffer to flat_binder_object structs */
const void *offsets;
} ptr;
uint8_t buf[8];
} data;
};
struct binder_ptr_cookie {
void *ptr;
void *cookie;
};
struct binder_pri_desc {
int priority;
int desc;
};
struct binder_pri_ptr_cookie {
int priority;
void *ptr;
void *cookie;
};
enum BinderDriverReturnProtocol {
BR_ERROR = _IOR('r', 0, int),
/*
* int: error code
*/
BR_OK = _IO('r', 1),
/* No parameters! */
BR_TRANSACTION = _IOR('r', 2, struct binder_transaction_data),
BR_REPLY = _IOR('r', 3, struct binder_transaction_data),
/*
* binder_transaction_data: the received command.
*/
BR_ACQUIRE_RESULT = _IOR('r', 4, int),
/*
* not currently supported
* int: 0 if the last bcATTEMPT_ACQUIRE was not successful.
* Else the remote object has acquired a primary reference.
*/
BR_DEAD_REPLY = _IO('r', 5),
/*
* The target of the last transaction (either a bcTRANSACTION or
* a bcATTEMPT_ACQUIRE) is no longer with us. No parameters.
*/
BR_TRANSACTION_COMPLETE = _IO('r', 6),
/*
* No parameters... always refers to the last transaction requested
* (including replies). Note that this will be sent even for
* asynchronous transactions.
*/
BR_INCREFS = _IOR('r', 7, struct binder_ptr_cookie),
BR_ACQUIRE = _IOR('r', 8, struct binder_ptr_cookie),
BR_RELEASE = _IOR('r', 9, struct binder_ptr_cookie),
BR_DECREFS = _IOR('r', 10, struct binder_ptr_cookie),
/*
* void *: ptr to binder
* void *: cookie for binder
*/
BR_ATTEMPT_ACQUIRE = _IOR('r', 11, struct binder_pri_ptr_cookie),
/*
* not currently supported
* int: priority
* void *: ptr to binder
* void *: cookie for binder
*/
BR_NOOP = _IO('r', 12),
/*
* No parameters. Do nothing and examine the next command. It exists
* primarily so that we can replace it with a BR_SPAWN_LOOPER command.
*/
BR_SPAWN_LOOPER = _IO('r', 13),
/*
* No parameters. The driver has determined that a process has no
* threads waiting to service incomming transactions. When a process
* receives this command, it must spawn a new service thread and
* register it via bcENTER_LOOPER.
*/
BR_FINISHED = _IO('r', 14),
/*
* not currently supported
* stop threadpool thread
*/
BR_DEAD_BINDER = _IOR('r', 15, void *),
/*
* void *: cookie
*/
BR_CLEAR_DEATH_NOTIFICATION_DONE = _IOR('r', 16, void *),
/*
* void *: cookie
*/
BR_FAILED_REPLY = _IO('r', 17),
/*
* The the last transaction (either a bcTRANSACTION or
* a bcATTEMPT_ACQUIRE) failed (e.g. out of memory). No parameters.
*/
};
enum BinderDriverCommandProtocol {
BC_TRANSACTION = _IOW('c', 0, struct binder_transaction_data),
BC_REPLY = _IOW('c', 1, struct binder_transaction_data),
/*
* binder_transaction_data: the sent command.
*/
BC_ACQUIRE_RESULT = _IOW('c', 2, int),
/*
* not currently supported
* int: 0 if the last BR_ATTEMPT_ACQUIRE was not successful.
* Else you have acquired a primary reference on the object.
*/
BC_FREE_BUFFER = _IOW('c', 3, int),
/*
* void *: ptr to transaction data received on a read
*/
BC_INCREFS = _IOW('c', 4, int),
BC_ACQUIRE = _IOW('c', 5, int),
BC_RELEASE = _IOW('c', 6, int),
BC_DECREFS = _IOW('c', 7, int),
/*
* int: descriptor
*/
BC_INCREFS_DONE = _IOW('c', 8, struct binder_ptr_cookie),
BC_ACQUIRE_DONE = _IOW('c', 9, struct binder_ptr_cookie),
/*
* void *: ptr to binder
* void *: cookie for binder
*/
BC_ATTEMPT_ACQUIRE = _IOW('c', 10, struct binder_pri_desc),
/*
* not currently supported
* int: priority
* int: descriptor
*/
BC_REGISTER_LOOPER = _IO('c', 11),
/*
* No parameters.
* Register a spawned looper thread with the device.
*/
BC_ENTER_LOOPER = _IO('c', 12),
BC_EXIT_LOOPER = _IO('c', 13),
/*
* No parameters.
* These two commands are sent as an application-level thread
* enters and exits the binder loop, respectively. They are
* used so the binder can have an accurate count of the number
* of looping threads it has available.
*/
BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14, struct binder_ptr_cookie),
/*
* void *: ptr to binder
* void *: cookie
*/
BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15, struct binder_ptr_cookie),
/*
* void *: ptr to binder
* void *: cookie
*/
BC_DEAD_BINDER_DONE = _IOW('c', 16, void *),
/*
* void *: cookie
*/
};
#endif /* _LINUX_BINDER_H */

607
drivers/staging/android/logger.c Normal file
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@ -0,0 +1,607 @@
/*
* drivers/misc/logger.c
*
* A Logging Subsystem
*
* Copyright (C) 2007-2008 Google, Inc.
*
* Robert Love <rlove@google.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.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/poll.h>
#include <linux/time.h>
#include "logger.h"
#include <asm/ioctls.h>
/*
* struct logger_log - represents a specific log, such as 'main' or 'radio'
*
* This structure lives from module insertion until module removal, so it does
* not need additional reference counting. The structure is protected by the
* mutex 'mutex'.
*/
struct logger_log {
unsigned char *buffer;/* the ring buffer itself */
struct miscdevice misc; /* misc device representing the log */
wait_queue_head_t wq; /* wait queue for readers */
struct list_head readers; /* this log's readers */
struct mutex mutex; /* mutex protecting buffer */
size_t w_off; /* current write head offset */
size_t head; /* new readers start here */
size_t size; /* size of the log */
};
/*
* struct logger_reader - a logging device open for reading
*
* This object lives from open to release, so we don't need additional
* reference counting. The structure is protected by log->mutex.
*/
struct logger_reader {
struct logger_log *log; /* associated log */
struct list_head list; /* entry in logger_log's list */
size_t r_off; /* current read head offset */
};
/* logger_offset - returns index 'n' into the log via (optimized) modulus */
#define logger_offset(n) ((n) & (log->size - 1))
/*
* file_get_log - Given a file structure, return the associated log
*
* This isn't aesthetic. We have several goals:
*
* 1) Need to quickly obtain the associated log during an I/O operation
* 2) Readers need to maintain state (logger_reader)
* 3) Writers need to be very fast (open() should be a near no-op)
*
* In the reader case, we can trivially go file->logger_reader->logger_log.
* For a writer, we don't want to maintain a logger_reader, so we just go
* file->logger_log. Thus what file->private_data points at depends on whether
* or not the file was opened for reading. This function hides that dirtiness.
*/
static inline struct logger_log *file_get_log(struct file *file)
{
if (file->f_mode & FMODE_READ) {
struct logger_reader *reader = file->private_data;
return reader->log;
} else
return file->private_data;
}
/*
* get_entry_len - Grabs the length of the payload of the next entry starting
* from 'off'.
*
* Caller needs to hold log->mutex.
*/
static __u32 get_entry_len(struct logger_log *log, size_t off)
{
__u16 val;
switch (log->size - off) {
case 1:
memcpy(&val, log->buffer + off, 1);
memcpy(((char *) &val) + 1, log->buffer, 1);
break;
default:
memcpy(&val, log->buffer + off, 2);
}
return sizeof(struct logger_entry) + val;
}
/*
* do_read_log_to_user - reads exactly 'count' bytes from 'log' into the
* user-space buffer 'buf'. Returns 'count' on success.
*
* Caller must hold log->mutex.
*/
static ssize_t do_read_log_to_user(struct logger_log *log,
struct logger_reader *reader,
char __user *buf,
size_t count)
{
size_t len;
/*
* We read from the log in two disjoint operations. First, we read from
* the current read head offset up to 'count' bytes or to the end of
* the log, whichever comes first.
*/
len = min(count, log->size - reader->r_off);
if (copy_to_user(buf, log->buffer + reader->r_off, len))
return -EFAULT;
/*
* Second, we read any remaining bytes, starting back at the head of
* the log.
*/
if (count != len)
if (copy_to_user(buf + len, log->buffer, count - len))
return -EFAULT;
reader->r_off = logger_offset(reader->r_off + count);
return count;
}
/*
* logger_read - our log's read() method
*
* Behavior:
*
* - O_NONBLOCK works
* - If there are no log entries to read, blocks until log is written to
* - Atomically reads exactly one log entry
*
* Optimal read size is LOGGER_ENTRY_MAX_LEN. Will set errno to EINVAL if read
* buffer is insufficient to hold next entry.
*/
static ssize_t logger_read(struct file *file, char __user *buf,
size_t count, loff_t *pos)
{
struct logger_reader *reader = file->private_data;
struct logger_log *log = reader->log;
ssize_t ret;
DEFINE_WAIT(wait);
start:
while (1) {
prepare_to_wait(&log->wq, &wait, TASK_INTERRUPTIBLE);
mutex_lock(&log->mutex);
ret = (log->w_off == reader->r_off);
mutex_unlock(&log->mutex);
if (!ret)
break;
if (file->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
break;
}
if (signal_pending(current)) {
ret = -EINTR;
break;
}
schedule();
}
finish_wait(&log->wq, &wait);
if (ret)
return ret;
mutex_lock(&log->mutex);
/* is there still something to read or did we race? */
if (unlikely(log->w_off == reader->r_off)) {
mutex_unlock(&log->mutex);
goto start;
}
/* get the size of the next entry */
ret = get_entry_len(log, reader->r_off);
if (count < ret) {
ret = -EINVAL;
goto out;
}
/* get exactly one entry from the log */
ret = do_read_log_to_user(log, reader, buf, ret);
out:
mutex_unlock(&log->mutex);
return ret;
}
/*
* get_next_entry - return the offset of the first valid entry at least 'len'
* bytes after 'off'.
*
* Caller must hold log->mutex.
*/
static size_t get_next_entry(struct logger_log *log, size_t off, size_t len)
{
size_t count = 0;
do {
size_t nr = get_entry_len(log, off);
off = logger_offset(off + nr);
count += nr;
} while (count < len);
return off;
}
/*
* clock_interval - is a < c < b in mod-space? Put another way, does the line
* from a to b cross c?
*/
static inline int clock_interval(size_t a, size_t b, size_t c)
{
if (b < a) {
if (a < c || b >= c)
return 1;
} else {
if (a < c && b >= c)
return 1;
}
return 0;
}
/*
* fix_up_readers - walk the list of all readers and "fix up" any who were
* lapped by the writer; also do the same for the default "start head".
* We do this by "pulling forward" the readers and start head to the first
* entry after the new write head.
*
* The caller needs to hold log->mutex.
*/
static void fix_up_readers(struct logger_log *log, size_t len)
{
size_t old = log->w_off;
size_t new = logger_offset(old + len);
struct logger_reader *reader;
if (clock_interval(old, new, log->head))
log->head = get_next_entry(log, log->head, len);
list_for_each_entry(reader, &log->readers, list)
if (clock_interval(old, new, reader->r_off))
reader->r_off = get_next_entry(log, reader->r_off, len);
}
/*
* do_write_log - writes 'len' bytes from 'buf' to 'log'
*
* The caller needs to hold log->mutex.
*/
static void do_write_log(struct logger_log *log, const void *buf, size_t count)
{
size_t len;
len = min(count, log->size - log->w_off);
memcpy(log->buffer + log->w_off, buf, len);
if (count != len)
memcpy(log->buffer, buf + len, count - len);
log->w_off = logger_offset(log->w_off + count);
}
/*
* do_write_log_user - writes 'len' bytes from the user-space buffer 'buf' to
* the log 'log'
*
* The caller needs to hold log->mutex.
*
* Returns 'count' on success, negative error code on failure.
*/
static ssize_t do_write_log_from_user(struct logger_log *log,
const void __user *buf, size_t count)
{
size_t len;
len = min(count, log->size - log->w_off);
if (len && copy_from_user(log->buffer + log->w_off, buf, len))
return -EFAULT;
if (count != len)
if (copy_from_user(log->buffer, buf + len, count - len))
return -EFAULT;
log->w_off = logger_offset(log->w_off + count);
return count;
}
/*
* logger_aio_write - our write method, implementing support for write(),
* writev(), and aio_write(). Writes are our fast path, and we try to optimize
* them above all else.
*/
ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t ppos)
{
struct logger_log *log = file_get_log(iocb->ki_filp);
size_t orig = log->w_off;
struct logger_entry header;
struct timespec now;
ssize_t ret = 0;
now = current_kernel_time();
header.pid = current->tgid;
header.tid = current->pid;
header.sec = now.tv_sec;
header.nsec = now.tv_nsec;
header.len = min_t(size_t, iocb->ki_left, LOGGER_ENTRY_MAX_PAYLOAD);
/* null writes succeed, return zero */
if (unlikely(!header.len))
return 0;
mutex_lock(&log->mutex);
/*
* Fix up any readers, pulling them forward to the first readable
* entry after (what will be) the new write offset. We do this now
* because if we partially fail, we can end up with clobbered log
* entries that encroach on readable buffer.
*/
fix_up_readers(log, sizeof(struct logger_entry) + header.len);
do_write_log(log, &header, sizeof(struct logger_entry));
while (nr_segs-- > 0) {
size_t len;
ssize_t nr;
/* figure out how much of this vector we can keep */
len = min_t(size_t, iov->iov_len, header.len - ret);
/* write out this segment's payload */
nr = do_write_log_from_user(log, iov->iov_base, len);
if (unlikely(nr < 0)) {
log->w_off = orig;
mutex_unlock(&log->mutex);
return nr;
}
iov++;
ret += nr;
}
mutex_unlock(&log->mutex);
/* wake up any blocked readers */
wake_up_interruptible(&log->wq);
return ret;
}
static struct logger_log *get_log_from_minor(int);
/*
* logger_open - the log's open() file operation
*
* Note how near a no-op this is in the write-only case. Keep it that way!
*/
static int logger_open(struct inode *inode, struct file *file)
{
struct logger_log *log;
int ret;
ret = nonseekable_open(inode, file);
if (ret)
return ret;
log = get_log_from_minor(MINOR(inode->i_rdev));
if (!log)
return -ENODEV;
if (file->f_mode & FMODE_READ) {
struct logger_reader *reader;
reader = kmalloc(sizeof(struct logger_reader), GFP_KERNEL);
if (!reader)
return -ENOMEM;
reader->log = log;
INIT_LIST_HEAD(&reader->list);
mutex_lock(&log->mutex);
reader->r_off = log->head;
list_add_tail(&reader->list, &log->readers);
mutex_unlock(&log->mutex);
file->private_data = reader;
} else
file->private_data = log;
return 0;
}
/*
* logger_release - the log's release file operation
*
* Note this is a total no-op in the write-only case. Keep it that way!
*/
static int logger_release(struct inode *ignored, struct file *file)
{
if (file->f_mode & FMODE_READ) {
struct logger_reader *reader = file->private_data;
list_del(&reader->list);
kfree(reader);
}
return 0;
}
/*
* logger_poll - the log's poll file operation, for poll/select/epoll
*
* Note we always return POLLOUT, because you can always write() to the log.
* Note also that, strictly speaking, a return value of POLLIN does not
* guarantee that the log is readable without blocking, as there is a small
* chance that the writer can lap the reader in the interim between poll()
* returning and the read() request.
*/
static unsigned int logger_poll(struct file *file, poll_table *wait)
{
struct logger_reader *reader;
struct logger_log *log;
unsigned int ret = POLLOUT | POLLWRNORM;
if (!(file->f_mode & FMODE_READ))
return ret;
reader = file->private_data;
log = reader->log;
poll_wait(file, &log->wq, wait);
mutex_lock(&log->mutex);
if (log->w_off != reader->r_off)
ret |= POLLIN | POLLRDNORM;
mutex_unlock(&log->mutex);
return ret;
}
static long logger_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct logger_log *log = file_get_log(file);
struct logger_reader *reader;
long ret = -ENOTTY;
mutex_lock(&log->mutex);
switch (cmd) {
case LOGGER_GET_LOG_BUF_SIZE:
ret = log->size;
break;
case LOGGER_GET_LOG_LEN:
if (!(file->f_mode & FMODE_READ)) {
ret = -EBADF;
break;
}
reader = file->private_data;
if (log->w_off >= reader->r_off)
ret = log->w_off - reader->r_off;
else
ret = (log->size - reader->r_off) + log->w_off;
break;
case LOGGER_GET_NEXT_ENTRY_LEN:
if (!(file->f_mode & FMODE_READ)) {
ret = -EBADF;
break;
}
reader = file->private_data;
if (log->w_off != reader->r_off)
ret = get_entry_len(log, reader->r_off);
else
ret = 0;
break;
case LOGGER_FLUSH_LOG:
if (!(file->f_mode & FMODE_WRITE)) {
ret = -EBADF;
break;
}
list_for_each_entry(reader, &log->readers, list)
reader->r_off = log->w_off;
log->head = log->w_off;
ret = 0;
break;
}
mutex_unlock(&log->mutex);
return ret;
}
static const struct file_operations logger_fops = {
.owner = THIS_MODULE,
.read = logger_read,
.aio_write = logger_aio_write,
.poll = logger_poll,
.unlocked_ioctl = logger_ioctl,
.compat_ioctl = logger_ioctl,
.open = logger_open,
.release = logger_release,
};
/*
* Defines a log structure with name 'NAME' and a size of 'SIZE' bytes, which
* must be a power of two, greater than LOGGER_ENTRY_MAX_LEN, and less than
* LONG_MAX minus LOGGER_ENTRY_MAX_LEN.
*/
#define DEFINE_LOGGER_DEVICE(VAR, NAME, SIZE) \
static unsigned char _buf_ ## VAR[SIZE]; \
static struct logger_log VAR = { \
.buffer = _buf_ ## VAR, \
.misc = { \
.minor = MISC_DYNAMIC_MINOR, \
.name = NAME, \
.fops = &logger_fops, \
.parent = NULL, \
}, \
.wq = __WAIT_QUEUE_HEAD_INITIALIZER(VAR .wq), \
.readers = LIST_HEAD_INIT(VAR .readers), \
.mutex = __MUTEX_INITIALIZER(VAR .mutex), \
.w_off = 0, \
.head = 0, \
.size = SIZE, \
};
DEFINE_LOGGER_DEVICE(log_main, LOGGER_LOG_MAIN, 64*1024)
DEFINE_LOGGER_DEVICE(log_events, LOGGER_LOG_EVENTS, 256*1024)
DEFINE_LOGGER_DEVICE(log_radio, LOGGER_LOG_RADIO, 64*1024)
static struct logger_log *get_log_from_minor(int minor)
{
if (log_main.misc.minor == minor)
return &log_main;
if (log_events.misc.minor == minor)
return &log_events;
if (log_radio.misc.minor == minor)
return &log_radio;
return NULL;
}
static int __init init_log(struct logger_log *log)
{
int ret;
ret = misc_register(&log->misc);
if (unlikely(ret)) {
printk(KERN_ERR "logger: failed to register misc "
"device for log '%s'!\n", log->misc.name);
return ret;
}
printk(KERN_INFO "logger: created %luK log '%s'\n",
(unsigned long) log->size >> 10, log->misc.name);
return 0;
}
static int __init logger_init(void)
{
int ret;
ret = init_log(&log_main);
if (unlikely(ret))
goto out;
ret = init_log(&log_events);
if (unlikely(ret))
goto out;
ret = init_log(&log_radio);
if (unlikely(ret))
goto out;
out:
return ret;
}
device_initcall(logger_init);

48
drivers/staging/android/logger.h Normal file
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/* include/linux/logger.h
*
* Copyright (C) 2007-2008 Google, Inc.
* Author: Robert Love <rlove@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_LOGGER_H
#define _LINUX_LOGGER_H
#include <linux/types.h>
#include <linux/ioctl.h>
struct logger_entry {
__u16 len; /* length of the payload */
__u16 __pad; /* no matter what, we get 2 bytes of padding */
__s32 pid; /* generating process's pid */
__s32 tid; /* generating process's tid */
__s32 sec; /* seconds since Epoch */
__s32 nsec; /* nanoseconds */
char msg[0]; /* the entry's payload */
};
#define LOGGER_LOG_RADIO "log_radio" /* radio-related messages */
#define LOGGER_LOG_EVENTS "log_events" /* system/hardware events */
#define LOGGER_LOG_MAIN "log_main" /* everything else */
#define LOGGER_ENTRY_MAX_LEN (4*1024)
#define LOGGER_ENTRY_MAX_PAYLOAD \
(LOGGER_ENTRY_MAX_LEN - sizeof(struct logger_entry))
#define __LOGGERIO 0xAE
#define LOGGER_GET_LOG_BUF_SIZE _IO(__LOGGERIO, 1) /* size of log */
#define LOGGER_GET_LOG_LEN _IO(__LOGGERIO, 2) /* used log len */
#define LOGGER_GET_NEXT_ENTRY_LEN _IO(__LOGGERIO, 3) /* next entry len */
#define LOGGER_FLUSH_LOG _IO(__LOGGERIO, 4) /* flush log */
#endif /* _LINUX_LOGGER_H */

173
drivers/staging/android/lowmemorykiller.c Normal file
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/* drivers/misc/lowmemorykiller.c
*
* The lowmemorykiller driver lets user-space specify a set of memory thresholds
* where processes with a range of oom_adj values will get killed. Specify the
* minimum oom_adj values in /sys/module/lowmemorykiller/parameters/adj and the
* number of free pages in /sys/module/lowmemorykiller/parameters/minfree. Both
* files take a comma separated list of numbers in ascending order.
*
* For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and
* "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill processes
* with a oom_adj value of 8 or higher when the free memory drops below 4096 pages
* and kill processes with a oom_adj value of 0 or higher when the free memory
* drops below 1024 pages.
*
* The driver considers memory used for caches to be free, but if a large
* percentage of the cached memory is locked this can be very inaccurate
* and processes may not get killed until the normal oom killer is triggered.
*
* Copyright (C) 2007-2008 Google, Inc.
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/oom.h>
#include <linux/sched.h>
static uint32_t lowmem_debug_level = 2;
static int lowmem_adj[6] = {
0,
1,
6,
12,
};
static int lowmem_adj_size = 4;
static size_t lowmem_minfree[6] = {
3 * 512, /* 6MB */
2 * 1024, /* 8MB */
4 * 1024, /* 16MB */
16 * 1024, /* 64MB */
};
static int lowmem_minfree_size = 4;
#define lowmem_print(level, x...) \
do { \
if (lowmem_debug_level >= (level)) \
printk(x); \
} while (0)
static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask)
{
struct task_struct *p;
struct task_struct *selected = NULL;
int rem = 0;
int tasksize;
int i;
int min_adj = OOM_ADJUST_MAX + 1;
int selected_tasksize = 0;
int selected_oom_adj;
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free = global_page_state(NR_FREE_PAGES);
int other_file = global_page_state(NR_FILE_PAGES);
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
for (i = 0; i < array_size; i++) {
if (other_free < lowmem_minfree[i] &&
other_file < lowmem_minfree[i]) {
min_adj = lowmem_adj[i];
break;
}
}
if (nr_to_scan > 0)
lowmem_print(3, "lowmem_shrink %d, %x, ofree %d %d, ma %d\n",
nr_to_scan, gfp_mask, other_free, other_file,
min_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
global_page_state(NR_ACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_INACTIVE_FILE);
if (nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) {
lowmem_print(5, "lowmem_shrink %d, %x, return %d\n",
nr_to_scan, gfp_mask, rem);
return rem;
}
selected_oom_adj = min_adj;
read_lock(&tasklist_lock);
for_each_process(p) {
struct mm_struct *mm;
int oom_adj;
task_lock(p);
mm = p->mm;
if (!mm) {
task_unlock(p);
continue;
}
oom_adj = mm->oom_adj;
if (oom_adj < min_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(mm);
task_unlock(p);
if (tasksize <= 0)
continue;
if (selected) {
if (oom_adj < selected_oom_adj)
continue;
if (oom_adj == selected_oom_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_adj = oom_adj;
lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_adj, tasksize);
}
if (selected) {
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
selected->pid, selected->comm,
selected_oom_adj, selected_tasksize);
force_sig(SIGKILL, selected);
rem -= selected_tasksize;
}
lowmem_print(4, "lowmem_shrink %d, %x, return %d\n",
nr_to_scan, gfp_mask, rem);
read_unlock(&tasklist_lock);
return rem;
}
static struct shrinker lowmem_shrinker = {
.shrink = lowmem_shrink,
.seeks = DEFAULT_SEEKS * 16
};
static int __init lowmem_init(void)
{
register_shrinker(&lowmem_shrinker);
return 0;
}
static void __exit lowmem_exit(void)
{
unregister_shrinker(&lowmem_shrinker);
}
module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR);
module_param_array_named(adj, lowmem_adj, int, &lowmem_adj_size,
S_IRUGO | S_IWUSR);
module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size,
S_IRUGO | S_IWUSR);
module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR);
module_init(lowmem_init);
module_exit(lowmem_exit);
MODULE_LICENSE("GPL");

410
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/* drivers/android/ram_console.c
*
* Copyright (C) 2007-2008 Google, Inc.
*
* 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.
*
*/
#include <linux/console.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
#include <linux/rslib.h>
#endif
struct ram_console_buffer {
uint32_t sig;
uint32_t start;
uint32_t size;
uint8_t data[0];
};
#define RAM_CONSOLE_SIG (0x43474244) /* DBGC */
#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
static char __initdata
ram_console_old_log_init_buffer[CONFIG_ANDROID_RAM_CONSOLE_EARLY_SIZE];
#endif
static char *ram_console_old_log;
static size_t ram_console_old_log_size;
static struct ram_console_buffer *ram_console_buffer;
static size_t ram_console_buffer_size;
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
static char *ram_console_par_buffer;
static struct rs_control *ram_console_rs_decoder;
static int ram_console_corrected_bytes;
static int ram_console_bad_blocks;
#define ECC_BLOCK_SIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_DATA_SIZE
#define ECC_SIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_ECC_SIZE
#define ECC_SYMSIZE CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_SYMBOL_SIZE
#define ECC_POLY CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION_POLYNOMIAL
#endif
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
static void ram_console_encode_rs8(uint8_t *data, size_t len, uint8_t *ecc)
{
int i;
uint16_t par[ECC_SIZE];
/* Initialize the parity buffer */
memset(par, 0, sizeof(par));
encode_rs8(ram_console_rs_decoder, data, len, par, 0);
for (i = 0; i < ECC_SIZE; i++)
ecc[i] = par[i];
}
static int ram_console_decode_rs8(void *data, size_t len, uint8_t *ecc)
{
int i;
uint16_t par[ECC_SIZE];
for (i = 0; i < ECC_SIZE; i++)
par[i] = ecc[i];
return decode_rs8(ram_console_rs_decoder, data, par, len,
NULL, 0, NULL, 0, NULL);
}
#endif
static void ram_console_update(const char *s, unsigned int count)
{
struct ram_console_buffer *buffer = ram_console_buffer;
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
uint8_t *buffer_end = buffer->data + ram_console_buffer_size;
uint8_t *block;
uint8_t *par;
int size = ECC_BLOCK_SIZE;
#endif
memcpy(buffer->data + buffer->start, s, count);
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
block = buffer->data + (buffer->start & ~(ECC_BLOCK_SIZE - 1));
par = ram_console_par_buffer +
(buffer->start / ECC_BLOCK_SIZE) * ECC_SIZE;
do {
if (block + ECC_BLOCK_SIZE > buffer_end)
size = buffer_end - block;
ram_console_encode_rs8(block, size, par);
block += ECC_BLOCK_SIZE;
par += ECC_SIZE;
} while (block < buffer->data + buffer->start + count);
#endif
}
static void ram_console_update_header(void)
{
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
struct ram_console_buffer *buffer = ram_console_buffer;
uint8_t *par;
par = ram_console_par_buffer +
DIV_ROUND_UP(ram_console_buffer_size, ECC_BLOCK_SIZE) * ECC_SIZE;
ram_console_encode_rs8((uint8_t *)buffer, sizeof(*buffer), par);
#endif
}
static void
ram_console_write(struct console *console, const char *s, unsigned int count)
{
int rem;
struct ram_console_buffer *buffer = ram_console_buffer;
if (count > ram_console_buffer_size) {
s += count - ram_console_buffer_size;
count = ram_console_buffer_size;
}
rem = ram_console_buffer_size - buffer->start;
if (rem < count) {
ram_console_update(s, rem);
s += rem;
count -= rem;
buffer->start = 0;
buffer->size = ram_console_buffer_size;
}
ram_console_update(s, count);
buffer->start += count;
if (buffer->size < ram_console_buffer_size)
buffer->size += count;
ram_console_update_header();
}
static struct console ram_console = {
.name = "ram",
.write = ram_console_write,
.flags = CON_PRINTBUFFER | CON_ENABLED,
.index = -1,
};
static void __init
ram_console_save_old(struct ram_console_buffer *buffer, char *dest)
{
size_t old_log_size = buffer->size;
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
uint8_t *block;
uint8_t *par;
char strbuf[80];
int strbuf_len;
block = buffer->data;
par = ram_console_par_buffer;
while (block < buffer->data + buffer->size) {
int numerr;
int size = ECC_BLOCK_SIZE;
if (block + size > buffer->data + ram_console_buffer_size)
size = buffer->data + ram_console_buffer_size - block;
numerr = ram_console_decode_rs8(block, size, par);
if (numerr > 0) {
#if 0
printk(KERN_INFO "ram_console: error in block %p, %d\n",
block, numerr);
#endif
ram_console_corrected_bytes += numerr;
} else if (numerr < 0) {
#if 0
printk(KERN_INFO "ram_console: uncorrectable error in "
"block %p\n", block);
#endif
ram_console_bad_blocks++;
}
block += ECC_BLOCK_SIZE;
par += ECC_SIZE;
}
if (ram_console_corrected_bytes || ram_console_bad_blocks)
strbuf_len = snprintf(strbuf, sizeof(strbuf),
"\n%d Corrected bytes, %d unrecoverable blocks\n",
ram_console_corrected_bytes, ram_console_bad_blocks);
else
strbuf_len = snprintf(strbuf, sizeof(strbuf),
"\nNo errors detected\n");
if (strbuf_len >= sizeof(strbuf))
strbuf_len = sizeof(strbuf) - 1;
old_log_size += strbuf_len;
#endif
if (dest == NULL) {
dest = kmalloc(old_log_size, GFP_KERNEL);
if (dest == NULL) {
printk(KERN_ERR
"ram_console: failed to allocate buffer\n");
return;
}
}
ram_console_old_log = dest;
ram_console_old_log_size = old_log_size;
memcpy(ram_console_old_log,
&buffer->data[buffer->start], buffer->size - buffer->start);
memcpy(ram_console_old_log + buffer->size - buffer->start,
&buffer->data[0], buffer->start);
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
memcpy(ram_console_old_log + old_log_size - strbuf_len,
strbuf, strbuf_len);
#endif
}
static int __init ram_console_init(struct ram_console_buffer *buffer,
size_t buffer_size, char *old_buf)
{
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
int numerr;
uint8_t *par;
#endif
ram_console_buffer = buffer;
ram_console_buffer_size =
buffer_size - sizeof(struct ram_console_buffer);
if (ram_console_buffer_size > buffer_size) {
pr_err("ram_console: buffer %p, invalid size %zu, "
"datasize %zu\n", buffer, buffer_size,
ram_console_buffer_size);
return 0;
}
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
ram_console_buffer_size -= (DIV_ROUND_UP(ram_console_buffer_size,
ECC_BLOCK_SIZE) + 1) * ECC_SIZE;
if (ram_console_buffer_size > buffer_size) {
pr_err("ram_console: buffer %p, invalid size %zu, "
"non-ecc datasize %zu\n",
buffer, buffer_size, ram_console_buffer_size);
return 0;
}
ram_console_par_buffer = buffer->data + ram_console_buffer_size;
/* first consecutive root is 0
* primitive element to generate roots = 1
*/
ram_console_rs_decoder = init_rs(ECC_SYMSIZE, ECC_POLY, 0, 1, ECC_SIZE);
if (ram_console_rs_decoder == NULL) {
printk(KERN_INFO "ram_console: init_rs failed\n");
return 0;
}
ram_console_corrected_bytes = 0;
ram_console_bad_blocks = 0;
par = ram_console_par_buffer +
DIV_ROUND_UP(ram_console_buffer_size, ECC_BLOCK_SIZE) * ECC_SIZE;
numerr = ram_console_decode_rs8(buffer, sizeof(*buffer), par);
if (numerr > 0) {
printk(KERN_INFO "ram_console: error in header, %d\n", numerr);
ram_console_corrected_bytes += numerr;
} else if (numerr < 0) {
printk(KERN_INFO
"ram_console: uncorrectable error in header\n");
ram_console_bad_blocks++;
}
#endif
if (buffer->sig == RAM_CONSOLE_SIG) {
if (buffer->size > ram_console_buffer_size
|| buffer->start > buffer->size)
printk(KERN_INFO "ram_console: found existing invalid "
"buffer, size %d, start %d\n",
buffer->size, buffer->start);
else {
printk(KERN_INFO "ram_console: found existing buffer, "
"size %d, start %d\n",
buffer->size, buffer->start);
ram_console_save_old(buffer, old_buf);
}
} else {
printk(KERN_INFO "ram_console: no valid data in buffer "
"(sig = 0x%08x)\n", buffer->sig);
}
buffer->sig = RAM_CONSOLE_SIG;
buffer->start = 0;
buffer->size = 0;
register_console(&ram_console);
#ifdef CONFIG_ANDROID_RAM_CONSOLE_ENABLE_VERBOSE
console_verbose();
#endif
return 0;
}
#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
static int __init ram_console_early_init(void)
{
return ram_console_init((struct ram_console_buffer *)
CONFIG_ANDROID_RAM_CONSOLE_EARLY_ADDR,
CONFIG_ANDROID_RAM_CONSOLE_EARLY_SIZE,
ram_console_old_log_init_buffer);
}
#else
static int ram_console_driver_probe(struct platform_device *pdev)
{
struct resource *res = pdev->resource;
size_t start;
size_t buffer_size;
void *buffer;
if (res == NULL || pdev->num_resources != 1 ||
!(res->flags & IORESOURCE_MEM)) {
printk(KERN_ERR "ram_console: invalid resource, %p %d flags "
"%lx\n", res, pdev->num_resources, res ? res->flags : 0);
return -ENXIO;
}
buffer_size = res->end - res->start + 1;
start = res->start;
printk(KERN_INFO "ram_console: got buffer at %zx, size %zx\n",
start, buffer_size);
buffer = ioremap(res->start, buffer_size);
if (buffer == NULL) {
printk(KERN_ERR "ram_console: failed to map memory\n");
return -ENOMEM;
}
return ram_console_init(buffer, buffer_size, NULL/* allocate */);
}
static struct platform_driver ram_console_driver = {
.probe = ram_console_driver_probe,
.driver = {
.name = "ram_console",
},
};
static int __init ram_console_module_init(void)
{
int err;
err = platform_driver_register(&ram_console_driver);
return err;
}
#endif
static ssize_t ram_console_read_old(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
loff_t pos = *offset;
ssize_t count;
if (pos >= ram_console_old_log_size)
return 0;
count = min(len, (size_t)(ram_console_old_log_size - pos));
if (copy_to_user(buf, ram_console_old_log + pos, count))
return -EFAULT;
*offset += count;
return count;
}
static const struct file_operations ram_console_file_ops = {
.owner = THIS_MODULE,
.read = ram_console_read_old,
};
static int __init ram_console_late_init(void)
{
struct proc_dir_entry *entry;
if (ram_console_old_log == NULL)
return 0;
#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
ram_console_old_log = kmalloc(ram_console_old_log_size, GFP_KERNEL);
if (ram_console_old_log == NULL) {
printk(KERN_ERR
"ram_console: failed to allocate buffer for old log\n");
ram_console_old_log_size = 0;
return 0;
}
memcpy(ram_console_old_log,
ram_console_old_log_init_buffer, ram_console_old_log_size);
#endif
entry = create_proc_entry("last_kmsg", S_IFREG | S_IRUGO, NULL);
if (!entry) {
printk(KERN_ERR "ram_console: failed to create proc entry\n");
kfree(ram_console_old_log);
ram_console_old_log = NULL;
return 0;
}
entry->proc_fops = &ram_console_file_ops;
entry->size = ram_console_old_log_size;
return 0;
}
#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT
console_initcall(ram_console_early_init);
#else
module_init(ram_console_module_init);
#endif
late_initcall(ram_console_late_init);

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/* drivers/misc/timed_gpio.c
*
* Copyright (C) 2008 Google, Inc.
* Author: Mike Lockwood <lockwood@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.
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/hrtimer.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include "timed_output.h"
#include "timed_gpio.h"
struct timed_gpio_data {
struct timed_output_dev dev;
struct hrtimer timer;
spinlock_t lock;
unsigned gpio;
int max_timeout;
u8 active_low;
};
static enum hrtimer_restart gpio_timer_func(struct hrtimer *timer)
{
struct timed_gpio_data *data =
container_of(timer, struct timed_gpio_data, timer);
gpio_direction_output(data->gpio, data->active_low ? 1 : 0);
return HRTIMER_NORESTART;
}
static int gpio_get_time(struct timed_output_dev *dev)
{
struct timed_gpio_data *data =
container_of(dev, struct timed_gpio_data, dev);
if (hrtimer_active(&data->timer)) {
ktime_t r = hrtimer_get_remaining(&data->timer);
struct timeval t = ktime_to_timeval(r);
return t.tv_sec * 1000 + t.tv_usec / 1000;
} else
return 0;
}
static void gpio_enable(struct timed_output_dev *dev, int value)
{
struct timed_gpio_data *data =
container_of(dev, struct timed_gpio_data, dev);
unsigned long flags;
spin_lock_irqsave(&data->lock, flags);
/* cancel previous timer and set GPIO according to value */
hrtimer_cancel(&data->timer);
gpio_direction_output(data->gpio, data->active_low ? !value : !!value);
if (value > 0) {
if (value > data->max_timeout)
value = data->max_timeout;
hrtimer_start(&data->timer,
ktime_set(value / 1000, (value % 1000) * 1000000),
HRTIMER_MODE_REL);
}
spin_unlock_irqrestore(&data->lock, flags);
}
static int timed_gpio_probe(struct platform_device *pdev)
{
struct timed_gpio_platform_data *pdata = pdev->dev.platform_data;
struct timed_gpio *cur_gpio;
struct timed_gpio_data *gpio_data, *gpio_dat;
int i, j, ret = 0;
if (!pdata)
return -EBUSY;
gpio_data = kzalloc(sizeof(struct timed_gpio_data) * pdata->num_gpios,
GFP_KERNEL);
if (!gpio_data)
return -ENOMEM;
for (i = 0; i < pdata->num_gpios; i++) {
cur_gpio = &pdata->gpios[i];
gpio_dat = &gpio_data[i];
hrtimer_init(&gpio_dat->timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
gpio_dat->timer.function = gpio_timer_func;
spin_lock_init(&gpio_dat->lock);
gpio_dat->dev.name = cur_gpio->name;
gpio_dat->dev.get_time = gpio_get_time;
gpio_dat->dev.enable = gpio_enable;
ret = timed_output_dev_register(&gpio_dat->dev);
if (ret < 0) {
for (j = 0; j < i; j++)
timed_output_dev_unregister(&gpio_data[i].dev);
kfree(gpio_data);
return ret;
}
gpio_dat->gpio = cur_gpio->gpio;
gpio_dat->max_timeout = cur_gpio->max_timeout;
gpio_dat->active_low = cur_gpio->active_low;
gpio_direction_output(gpio_dat->gpio, gpio_dat->active_low);
}
platform_set_drvdata(pdev, gpio_data);
return 0;
}
static int timed_gpio_remove(struct platform_device *pdev)
{
struct timed_gpio_platform_data *pdata = pdev->dev.platform_data;
struct timed_gpio_data *gpio_data = platform_get_drvdata(pdev);
int i;
for (i = 0; i < pdata->num_gpios; i++)
timed_output_dev_unregister(&gpio_data[i].dev);
kfree(gpio_data);
return 0;
}
static struct platform_driver timed_gpio_driver = {
.probe = timed_gpio_probe,
.remove = timed_gpio_remove,
.driver = {
.name = TIMED_GPIO_NAME,
.owner = THIS_MODULE,
},
};
static int __init timed_gpio_init(void)
{
return platform_driver_register(&timed_gpio_driver);
}
static void __exit timed_gpio_exit(void)
{
platform_driver_unregister(&timed_gpio_driver);
}
module_init(timed_gpio_init);
module_exit(timed_gpio_exit);
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
MODULE_DESCRIPTION("timed gpio driver");
MODULE_LICENSE("GPL");

33
drivers/staging/android/timed_gpio.h Normal file
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/* include/linux/timed_gpio.h
*
* Copyright (C) 2008 Google, Inc.
*
* 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_TIMED_GPIO_H
#define _LINUX_TIMED_GPIO_H
#define TIMED_GPIO_NAME "timed-gpio"
struct timed_gpio {
const char *name;
unsigned gpio;
int max_timeout;
u8 active_low;
};
struct timed_gpio_platform_data {
int num_gpios;
struct timed_gpio *gpios;
};
#endif

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drivers/staging/android/timed_output.c Normal file
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/* drivers/misc/timed_output.c
*
* Copyright (C) 2009 Google, Inc.
* Author: Mike Lockwood <lockwood@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.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/err.h>
#include "timed_output.h"
static struct class *timed_output_class;
static atomic_t device_count;
static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct timed_output_dev *tdev = dev_get_drvdata(dev);
int remaining = tdev->get_time(tdev);
return sprintf(buf, "%d\n", remaining);
}
static ssize_t enable_store(
struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
struct timed_output_dev *tdev = dev_get_drvdata(dev);
int value;
sscanf(buf, "%d", &value);
tdev->enable(tdev, value);
return size;
}
static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
static int create_timed_output_class(void)
{
if (!timed_output_class) {
timed_output_class = class_create(THIS_MODULE, "timed_output");
if (IS_ERR(timed_output_class))
return PTR_ERR(timed_output_class);
atomic_set(&device_count, 0);
}
return 0;
}
int timed_output_dev_register(struct timed_output_dev *tdev)
{
int ret;
if (!tdev || !tdev->name || !tdev->enable || !tdev->get_time)
return -EINVAL;
ret = create_timed_output_class();
if (ret < 0)
return ret;
tdev->index = atomic_inc_return(&device_count);
tdev->dev = device_create(timed_output_class, NULL,
MKDEV(0, tdev->index), NULL, tdev->name);
if (IS_ERR(tdev->dev))
return PTR_ERR(tdev->dev);
ret = device_create_file(tdev->dev, &dev_attr_enable);
if (ret < 0)
goto err_create_file;
dev_set_drvdata(tdev->dev, tdev);
tdev->state = 0;
return 0;
err_create_file:
device_destroy(timed_output_class, MKDEV(0, tdev->index));
printk(KERN_ERR "timed_output: Failed to register driver %s\n",
tdev->name);
return ret;
}
EXPORT_SYMBOL_GPL(timed_output_dev_register);
void timed_output_dev_unregister(struct timed_output_dev *tdev)
{
device_remove_file(tdev->dev, &dev_attr_enable);
device_destroy(timed_output_class, MKDEV(0, tdev->index));
dev_set_drvdata(tdev->dev, NULL);
}
EXPORT_SYMBOL_GPL(timed_output_dev_unregister);
static int __init timed_output_init(void)
{
return create_timed_output_class();
}
static void __exit timed_output_exit(void)
{
class_destroy(timed_output_class);
}
module_init(timed_output_init);
module_exit(timed_output_exit);
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
MODULE_DESCRIPTION("timed output class driver");
MODULE_LICENSE("GPL");

37
drivers/staging/android/timed_output.h Normal file
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/* include/linux/timed_output.h
*
* Copyright (C) 2008 Google, Inc.
*
* 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_TIMED_OUTPUT_H
#define _LINUX_TIMED_OUTPUT_H
struct timed_output_dev {
const char *name;
/* enable the output and set the timer */
void (*enable)(struct timed_output_dev *sdev, int timeout);
/* returns the current number of milliseconds remaining on the timer */
int (*get_time)(struct timed_output_dev *sdev);
/* private data */
struct device *dev;
int index;
int state;
};
extern int timed_output_dev_register(struct timed_output_dev *dev);
extern void timed_output_dev_unregister(struct timed_output_dev *dev);
#endif