![Tejun Heo](/assets/img/avatar_default.png)
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 #2 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>
269 lines
7.1 KiB
C
269 lines
7.1 KiB
C
/*
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* wm8775 - driver version 0.0.1
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*
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* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
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*
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* Based on saa7115 driver
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*
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* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
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* - Cleanup
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* - V4L2 API update
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* - sound fixes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/ioctl.h>
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#include <asm/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/i2c-id.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-chip-ident.h>
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#include <media/v4l2-i2c-drv.h>
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MODULE_DESCRIPTION("wm8775 driver");
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MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
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MODULE_LICENSE("GPL");
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/* ----------------------------------------------------------------------- */
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enum {
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R7 = 7, R11 = 11,
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R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
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TOT_REGS
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};
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struct wm8775_state {
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struct v4l2_subdev sd;
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u8 input; /* Last selected input (0-0xf) */
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u8 muted;
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};
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static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct wm8775_state, sd);
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}
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static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int i;
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if (reg < 0 || reg >= TOT_REGS) {
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v4l2_err(sd, "Invalid register R%d\n", reg);
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return -1;
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}
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for (i = 0; i < 3; i++)
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if (i2c_smbus_write_byte_data(client,
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(reg << 1) | (val >> 8), val & 0xff) == 0)
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return 0;
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v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
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return -1;
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}
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static int wm8775_s_routing(struct v4l2_subdev *sd,
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u32 input, u32 output, u32 config)
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{
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struct wm8775_state *state = to_state(sd);
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/* There are 4 inputs and one output. Zero or more inputs
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are multiplexed together to the output. Hence there are
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16 combinations.
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If only one input is active (the normal case) then the
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input values 1, 2, 4 or 8 should be used. */
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if (input > 15) {
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v4l2_err(sd, "Invalid input %d.\n", input);
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return -EINVAL;
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}
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state->input = input;
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if (state->muted)
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return 0;
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wm8775_write(sd, R21, 0x0c0);
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wm8775_write(sd, R14, 0x1d4);
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wm8775_write(sd, R15, 0x1d4);
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wm8775_write(sd, R21, 0x100 + state->input);
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return 0;
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}
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static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
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{
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struct wm8775_state *state = to_state(sd);
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if (ctrl->id != V4L2_CID_AUDIO_MUTE)
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return -EINVAL;
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ctrl->value = state->muted;
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return 0;
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}
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static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
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{
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struct wm8775_state *state = to_state(sd);
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if (ctrl->id != V4L2_CID_AUDIO_MUTE)
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return -EINVAL;
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state->muted = ctrl->value;
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wm8775_write(sd, R21, 0x0c0);
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wm8775_write(sd, R14, 0x1d4);
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wm8775_write(sd, R15, 0x1d4);
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if (!state->muted)
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wm8775_write(sd, R21, 0x100 + state->input);
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return 0;
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}
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static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
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}
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static int wm8775_log_status(struct v4l2_subdev *sd)
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{
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struct wm8775_state *state = to_state(sd);
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v4l2_info(sd, "Input: %d%s\n", state->input,
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state->muted ? " (muted)" : "");
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return 0;
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}
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static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
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{
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struct wm8775_state *state = to_state(sd);
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/* If I remove this, then it can happen that I have no
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sound the first time I tune from static to a valid channel.
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It's difficult to reproduce and is almost certainly related
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to the zero cross detect circuit. */
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wm8775_write(sd, R21, 0x0c0);
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wm8775_write(sd, R14, 0x1d4);
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wm8775_write(sd, R15, 0x1d4);
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wm8775_write(sd, R21, 0x100 + state->input);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops wm8775_core_ops = {
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.log_status = wm8775_log_status,
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.g_chip_ident = wm8775_g_chip_ident,
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.g_ctrl = wm8775_g_ctrl,
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.s_ctrl = wm8775_s_ctrl,
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};
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static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
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.s_frequency = wm8775_s_frequency,
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};
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static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
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.s_routing = wm8775_s_routing,
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};
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static const struct v4l2_subdev_ops wm8775_ops = {
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.core = &wm8775_core_ops,
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.tuner = &wm8775_tuner_ops,
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.audio = &wm8775_audio_ops,
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};
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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/*
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* Generic i2c probe
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* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
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*/
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static int wm8775_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct wm8775_state *state;
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struct v4l2_subdev *sd;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
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state->input = 2;
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state->muted = 0;
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/* Initialize wm8775 */
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/* RESET */
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wm8775_write(sd, R23, 0x000);
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/* Disable zero cross detect timeout */
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wm8775_write(sd, R7, 0x000);
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/* Left justified, 24-bit mode */
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wm8775_write(sd, R11, 0x021);
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/* Master mode, clock ratio 256fs */
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wm8775_write(sd, R12, 0x102);
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/* Powered up */
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wm8775_write(sd, R13, 0x000);
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/* ADC gain +2.5dB, enable zero cross */
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wm8775_write(sd, R14, 0x1d4);
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/* ADC gain +2.5dB, enable zero cross */
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wm8775_write(sd, R15, 0x1d4);
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/* ALC Stereo, ALC target level -1dB FS max gain +8dB */
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wm8775_write(sd, R16, 0x1bf);
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/* Enable gain control, use zero cross detection,
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ALC hold time 42.6 ms */
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wm8775_write(sd, R17, 0x185);
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/* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
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wm8775_write(sd, R18, 0x0a2);
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/* Enable noise gate, threshold -72dBfs */
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wm8775_write(sd, R19, 0x005);
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/* Transient window 4ms, lower PGA gain limit -1dB */
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wm8775_write(sd, R20, 0x07a);
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/* LRBOTH = 1, use input 2. */
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wm8775_write(sd, R21, 0x102);
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return 0;
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}
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static int wm8775_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(to_state(sd));
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return 0;
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}
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static const struct i2c_device_id wm8775_id[] = {
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{ "wm8775", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm8775_id);
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static struct v4l2_i2c_driver_data v4l2_i2c_data = {
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.name = "wm8775",
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.probe = wm8775_probe,
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.remove = wm8775_remove,
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.id_table = wm8775_id,
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};
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