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linux/drivers/media/dvb/ttpci/av7110_ir.c
Arnd Bergmann 6038f373a3 llseek: automatically add .llseek fop 
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-10-15 15:53:27 +02:00

416 lines
11 KiB
C
Raw Blame History

/*
* Driver for the remote control of SAA7146 based AV7110 cards
*
* Copyright (C) 1999-2003 Holger Waechtler <holger@convergence.de>
* Copyright (C) 2003-2007 Oliver Endriss <o.endriss@gmx.de>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include "av7110.h"
#include "av7110_hw.h"
#define AV_CNT 4
#define IR_RC5 0
#define IR_RCMM 1
#define IR_RC5_EXT 2 /* internal only */
#define IR_ALL 0xffffffff
#define UP_TIMEOUT (HZ*7/25)
/* Note: enable ir debugging by or'ing debug with 16 */
static int ir_protocol[AV_CNT] = { IR_RCMM, IR_RCMM, IR_RCMM, IR_RCMM};
module_param_array(ir_protocol, int, NULL, 0644);
MODULE_PARM_DESC(ir_protocol, "Infrared protocol: 0 RC5, 1 RCMM (default)");
static int ir_inversion[AV_CNT];
module_param_array(ir_inversion, int, NULL, 0644);
MODULE_PARM_DESC(ir_inversion, "Inversion of infrared signal: 0 not inverted (default), 1 inverted");
static uint ir_device_mask[AV_CNT] = { IR_ALL, IR_ALL, IR_ALL, IR_ALL };
module_param_array(ir_device_mask, uint, NULL, 0644);
MODULE_PARM_DESC(ir_device_mask, "Bitmask of infrared devices: bit 0..31 = device 0..31 (default: all)");
static int av_cnt;
static struct av7110 *av_list[AV_CNT];
static u16 default_key_map [256] = {
KEY_0, KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7,
KEY_8, KEY_9, KEY_BACK, 0, KEY_POWER, KEY_MUTE, 0, KEY_INFO,
KEY_VOLUMEUP, KEY_VOLUMEDOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
KEY_CHANNELUP, KEY_CHANNELDOWN, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, KEY_TEXT, 0, 0, KEY_TV, 0, 0, 0, 0, 0, KEY_SETUP, 0, 0,
0, 0, 0, KEY_SUBTITLE, 0, 0, KEY_LANGUAGE, 0,
KEY_RADIO, 0, 0, 0, 0, KEY_EXIT, 0, 0,
KEY_UP, KEY_DOWN, KEY_LEFT, KEY_RIGHT, KEY_OK, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RED, KEY_GREEN, KEY_YELLOW,
KEY_BLUE, 0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_LIST, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, KEY_UP, KEY_UP, KEY_DOWN, KEY_DOWN,
0, 0, 0, 0, KEY_EPG, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_VCR
};
/* key-up timer */
static void av7110_emit_keyup(unsigned long parm)
{
struct infrared *ir = (struct infrared *) parm;
if (!ir || !test_bit(ir->last_key, ir->input_dev->key))
return;
input_report_key(ir->input_dev, ir->last_key, 0);
input_sync(ir->input_dev);
}
/* tasklet */
static void av7110_emit_key(unsigned long parm)
{
struct infrared *ir = (struct infrared *) parm;
u32 ircom = ir->ir_command;
u8 data;
u8 addr;
u16 toggle;
u16 keycode;
/* extract device address and data */
switch (ir->protocol) {
case IR_RC5: /* RC5: 5 bits device address, 6 bits data */
data = ircom & 0x3f;
addr = (ircom >> 6) & 0x1f;
toggle = ircom & 0x0800;
break;
case IR_RCMM: /* RCMM: ? bits device address, ? bits data */
data = ircom & 0xff;
addr = (ircom >> 8) & 0x1f;
toggle = ircom & 0x8000;
break;
case IR_RC5_EXT: /* extended RC5: 5 bits device address, 7 bits data */
data = ircom & 0x3f;
addr = (ircom >> 6) & 0x1f;
/* invert 7th data bit for backward compatibility with RC5 keymaps */
if (!(ircom & 0x1000))
data |= 0x40;
toggle = ircom & 0x0800;
break;
default:
printk("%s invalid protocol %x\n", __func__, ir->protocol);
return;
}
input_event(ir->input_dev, EV_MSC, MSC_RAW, (addr << 16) | data);
input_event(ir->input_dev, EV_MSC, MSC_SCAN, data);
keycode = ir->key_map[data];
dprintk(16, "%s: code %08x -> addr %i data 0x%02x -> keycode %i\n",
__func__, ircom, addr, data, keycode);
/* check device address */
if (!(ir->device_mask & (1 << addr)))
return;
if (!keycode) {
printk ("%s: code %08x -> addr %i data 0x%02x -> unknown key!\n",
__func__, ircom, addr, data);
return;
}
if (timer_pending(&ir->keyup_timer)) {
del_timer(&ir->keyup_timer);
if (ir->last_key != keycode || toggle != ir->last_toggle) {
ir->delay_timer_finished = 0;
input_event(ir->input_dev, EV_KEY, ir->last_key, 0);
input_event(ir->input_dev, EV_KEY, keycode, 1);
input_sync(ir->input_dev);
} else if (ir->delay_timer_finished) {
input_event(ir->input_dev, EV_KEY, keycode, 2);
input_sync(ir->input_dev);
}
} else {
ir->delay_timer_finished = 0;
input_event(ir->input_dev, EV_KEY, keycode, 1);
input_sync(ir->input_dev);
}
ir->last_key = keycode;
ir->last_toggle = toggle;
ir->keyup_timer.expires = jiffies + UP_TIMEOUT;
add_timer(&ir->keyup_timer);
}
/* register with input layer */
static void input_register_keys(struct infrared *ir)
{
int i;
set_bit(EV_KEY, ir->input_dev->evbit);
set_bit(EV_REP, ir->input_dev->evbit);
set_bit(EV_MSC, ir->input_dev->evbit);
set_bit(MSC_RAW, ir->input_dev->mscbit);
set_bit(MSC_SCAN, ir->input_dev->mscbit);
memset(ir->input_dev->keybit, 0, sizeof(ir->input_dev->keybit));
for (i = 0; i < ARRAY_SIZE(ir->key_map); i++) {
if (ir->key_map[i] > KEY_MAX)
ir->key_map[i] = 0;
else if (ir->key_map[i] > KEY_RESERVED)
set_bit(ir->key_map[i], ir->input_dev->keybit);
}
ir->input_dev->keycode = ir->key_map;
ir->input_dev->keycodesize = sizeof(ir->key_map[0]);
ir->input_dev->keycodemax = ARRAY_SIZE(ir->key_map);
}
/* called by the input driver after rep[REP_DELAY] ms */
static void input_repeat_key(unsigned long parm)
{
struct infrared *ir = (struct infrared *) parm;
ir->delay_timer_finished = 1;
}
/* check for configuration changes */
int av7110_check_ir_config(struct av7110 *av7110, int force)
{
int i;
int modified = force;
int ret = -ENODEV;
for (i = 0; i < av_cnt; i++)
if (av7110 == av_list[i])
break;
if (i < av_cnt && av7110) {
if ((av7110->ir.protocol & 1) != ir_protocol[i] ||
av7110->ir.inversion != ir_inversion[i])
modified = true;
if (modified) {
/* protocol */
if (ir_protocol[i]) {
ir_protocol[i] = 1;
av7110->ir.protocol = IR_RCMM;
av7110->ir.ir_config = 0x0001;
} else if (FW_VERSION(av7110->arm_app) >= 0x2620) {
av7110->ir.protocol = IR_RC5_EXT;
av7110->ir.ir_config = 0x0002;
} else {
av7110->ir.protocol = IR_RC5;
av7110->ir.ir_config = 0x0000;
}
/* inversion */
if (ir_inversion[i]) {
ir_inversion[i] = 1;
av7110->ir.ir_config |= 0x8000;
}
av7110->ir.inversion = ir_inversion[i];
/* update ARM */
ret = av7110_fw_cmd(av7110, COMTYPE_PIDFILTER, SetIR, 1,
av7110->ir.ir_config);
} else
ret = 0;
/* address */
if (av7110->ir.device_mask != ir_device_mask[i])
av7110->ir.device_mask = ir_device_mask[i];
}
return ret;
}
/* /proc/av7110_ir interface */
static ssize_t av7110_ir_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *pos)
{
char *page;
u32 ir_config;
int size = sizeof ir_config + sizeof av_list[0]->ir.key_map;
int i;
if (count < size)
return -EINVAL;
page = vmalloc(size);
if (!page)
return -ENOMEM;
if (copy_from_user(page, buffer, size)) {
vfree(page);
return -EFAULT;
}
memcpy(&ir_config, page, sizeof ir_config);
for (i = 0; i < av_cnt; i++) {
/* keymap */
memcpy(av_list[i]->ir.key_map, page + sizeof ir_config,
sizeof(av_list[i]->ir.key_map));
/* protocol, inversion, address */
ir_protocol[i] = ir_config & 0x0001;
ir_inversion[i] = ir_config & 0x8000 ? 1 : 0;
if (ir_config & 0x4000)
ir_device_mask[i] = 1 << ((ir_config >> 16) & 0x1f);
else
ir_device_mask[i] = IR_ALL;
/* update configuration */
av7110_check_ir_config(av_list[i], false);
input_register_keys(&av_list[i]->ir);
}
vfree(page);
return count;
}
static const struct file_operations av7110_ir_proc_fops = {
.owner = THIS_MODULE,
.write = av7110_ir_proc_write,
.llseek = noop_llseek,
};
/* interrupt handler */
static void ir_handler(struct av7110 *av7110, u32 ircom)
{
dprintk(4, "ir command = %08x\n", ircom);
av7110->ir.ir_command = ircom;
tasklet_schedule(&av7110->ir.ir_tasklet);
}
int __devinit av7110_ir_init(struct av7110 *av7110)
{
struct input_dev *input_dev;
static struct proc_dir_entry *e;
int err;
if (av_cnt >= ARRAY_SIZE(av_list))
return -ENOSPC;
av_list[av_cnt++] = av7110;
av7110_check_ir_config(av7110, true);
init_timer(&av7110->ir.keyup_timer);
av7110->ir.keyup_timer.function = av7110_emit_keyup;
av7110->ir.keyup_timer.data = (unsigned long) &av7110->ir;
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
av7110->ir.input_dev = input_dev;
snprintf(av7110->ir.input_phys, sizeof(av7110->ir.input_phys),
"pci-%s/ir0", pci_name(av7110->dev->pci));
input_dev->name = "DVB on-card IR receiver";
input_dev->phys = av7110->ir.input_phys;
input_dev->id.bustype = BUS_PCI;
input_dev->id.version = 2;
if (av7110->dev->pci->subsystem_vendor) {
input_dev->id.vendor = av7110->dev->pci->subsystem_vendor;
input_dev->id.product = av7110->dev->pci->subsystem_device;
} else {
input_dev->id.vendor = av7110->dev->pci->vendor;
input_dev->id.product = av7110->dev->pci->device;
}
input_dev->dev.parent = &av7110->dev->pci->dev;
/* initial keymap */
memcpy(av7110->ir.key_map, default_key_map, sizeof av7110->ir.key_map);
input_register_keys(&av7110->ir);
err = input_register_device(input_dev);
if (err) {
input_free_device(input_dev);
return err;
}
input_dev->timer.function = input_repeat_key;
input_dev->timer.data = (unsigned long) &av7110->ir;
if (av_cnt == 1) {
e = proc_create("av7110_ir", S_IWUSR, NULL, &av7110_ir_proc_fops);
if (e)
e->size = 4 + 256 * sizeof(u16);
}
tasklet_init(&av7110->ir.ir_tasklet, av7110_emit_key, (unsigned long) &av7110->ir);
av7110->ir.ir_handler = ir_handler;
return 0;
}
void __devexit av7110_ir_exit(struct av7110 *av7110)
{
int i;
if (av_cnt == 0)
return;
del_timer_sync(&av7110->ir.keyup_timer);
av7110->ir.ir_handler = NULL;
tasklet_kill(&av7110->ir.ir_tasklet);
for (i = 0; i < av_cnt; i++)
if (av_list[i] == av7110) {
av_list[i] = av_list[av_cnt-1];
av_list[av_cnt-1] = NULL;
break;
}
if (av_cnt == 1)
remove_proc_entry("av7110_ir", NULL);
input_unregister_device(av7110->ir.input_dev);
av_cnt--;
}
//MODULE_AUTHOR("Holger Waechtler <holger@convergence.de>, Oliver Endriss <o.endriss@gmx.de>");
//MODULE_LICENSE("GPL");
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