linux/drivers/media/video/tlv320aic23b.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from  to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

208 lines
5.5 KiB
C

/*
* tlv320aic23b - driver version 0.0.1
*
* Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
*
* Based on wm8775 driver
*
* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-i2c-drv.h>
MODULE_DESCRIPTION("tlv320aic23b driver");
MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");
/* ----------------------------------------------------------------------- */
struct tlv320aic23b_state {
struct v4l2_subdev sd;
u8 muted;
};
static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct tlv320aic23b_state, sd);
}
static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int i;
if ((reg < 0 || reg > 9) && (reg != 15)) {
v4l2_err(sd, "Invalid register R%d\n", reg);
return -1;
}
for (i = 0; i < 3; i++)
if (i2c_smbus_write_byte_data(client,
(reg << 1) | (val >> 8), val & 0xff) == 0)
return 0;
v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
return -1;
}
static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
{
switch (freq) {
case 32000: /* set sample rate to 32 kHz */
tlv320aic23b_write(sd, 8, 0x018);
break;
case 44100: /* set sample rate to 44.1 kHz */
tlv320aic23b_write(sd, 8, 0x022);
break;
case 48000: /* set sample rate to 48 kHz */
tlv320aic23b_write(sd, 8, 0x000);
break;
default:
return -EINVAL;
}
return 0;
}
static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct tlv320aic23b_state *state = to_state(sd);
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
ctrl->value = state->muted;
return 0;
}
static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct tlv320aic23b_state *state = to_state(sd);
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
state->muted = ctrl->value;
tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
/* set gain on both channels to +3.0 dB */
if (!state->muted)
tlv320aic23b_write(sd, 0, 0x119);
return 0;
}
static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
{
struct tlv320aic23b_state *state = to_state(sd);
v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
.log_status = tlv320aic23b_log_status,
.g_ctrl = tlv320aic23b_g_ctrl,
.s_ctrl = tlv320aic23b_s_ctrl,
};
static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
.s_clock_freq = tlv320aic23b_s_clock_freq,
};
static const struct v4l2_subdev_ops tlv320aic23b_ops = {
.core = &tlv320aic23b_core_ops,
.audio = &tlv320aic23b_audio_ops,
};
/* ----------------------------------------------------------------------- */
/* i2c implementation */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static int tlv320aic23b_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tlv320aic23b_state *state;
struct v4l2_subdev *sd;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
state->muted = 0;
/* Initialize tlv320aic23b */
/* RESET */
tlv320aic23b_write(sd, 15, 0x000);
/* turn off DAC & mic input */
tlv320aic23b_write(sd, 6, 0x00A);
/* left-justified, 24-bit, master mode */
tlv320aic23b_write(sd, 7, 0x049);
/* set gain on both channels to +3.0 dB */
tlv320aic23b_write(sd, 0, 0x119);
/* set sample rate to 48 kHz */
tlv320aic23b_write(sd, 8, 0x000);
/* activate digital interface */
tlv320aic23b_write(sd, 9, 0x001);
return 0;
}
static int tlv320aic23b_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(to_state(sd));
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct i2c_device_id tlv320aic23b_id[] = {
{ "tlv320aic23b", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "tlv320aic23b",
.probe = tlv320aic23b_probe,
.remove = tlv320aic23b_remove,
.id_table = tlv320aic23b_id,
};