80845a3316
Some v4l drivers currently don't initialize their struct v4l2_subdev
with zeros, and this is a problem since some of the v4l2 code expects
this. One example is the addition of internal_ops in commit 45f6f84,
after that we are at risk of random oopses with these drivers when code
in v4l2_device_register_subdev tries to dereference sd->internal_ops->*,
as can be shown by the report at http://bugs.launchpad.net/bugs/745213
and analysis of its crash at https://lkml.org/lkml/2011/4/1/168
Use kzalloc within problematic drivers to ensure we have a zeroed struct
v4l2_subdev.
BugLink: http://bugs.launchpad.net/bugs/745213
Cc: <stable@kernel.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
227 lines
6 KiB
C
227 lines
6 KiB
C
/*
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* m52790 i2c ivtv driver.
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* Copyright (C) 2007 Hans Verkuil
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*
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* A/V source switching Mitsubishi M52790SP/FP
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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/videodev2.h>
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#include <media/m52790.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-chip-ident.h>
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MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_LICENSE("GPL");
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struct m52790_state {
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struct v4l2_subdev sd;
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u16 input;
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u16 output;
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};
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static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct m52790_state, sd);
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}
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/* ----------------------------------------------------------------------- */
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static int m52790_write(struct v4l2_subdev *sd)
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{
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struct m52790_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 sw1 = (state->input | state->output) & 0xff;
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u8 sw2 = (state->input | state->output) >> 8;
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return i2c_smbus_write_byte_data(client, sw1, sw2);
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}
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/* Note: audio and video are linked and cannot be switched separately.
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So audio and video routing commands are identical for this chip.
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In theory the video amplifier and audio modes could be handled
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separately for the output, but that seems to be overkill right now.
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The same holds for implementing an audio mute control, this is now
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part of the audio output routing. The normal case is that another
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chip takes care of the actual muting so making it part of the
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output routing seems to be the right thing to do for now. */
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static int m52790_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 m52790_state *state = to_state(sd);
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state->input = input;
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state->output = output;
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m52790_write(sd);
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return 0;
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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struct m52790_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (!v4l2_chip_match_i2c_client(client, ®->match))
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (reg->reg != 0)
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return -EINVAL;
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reg->size = 1;
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reg->val = state->input | state->output;
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return 0;
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}
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static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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struct m52790_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (!v4l2_chip_match_i2c_client(client, ®->match))
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (reg->reg != 0)
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return -EINVAL;
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state->input = reg->val & 0x0303;
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state->output = reg->val & ~0x0303;
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m52790_write(sd);
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return 0;
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}
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#endif
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static int m52790_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_M52790, 0);
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}
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static int m52790_log_status(struct v4l2_subdev *sd)
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{
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struct m52790_state *state = to_state(sd);
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v4l2_info(sd, "Switch 1: %02x\n",
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(state->input | state->output) & 0xff);
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v4l2_info(sd, "Switch 2: %02x\n",
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(state->input | state->output) >> 8);
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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 m52790_core_ops = {
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.log_status = m52790_log_status,
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.g_chip_ident = m52790_g_chip_ident,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = m52790_g_register,
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.s_register = m52790_s_register,
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#endif
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};
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static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
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.s_routing = m52790_s_routing,
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};
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static const struct v4l2_subdev_video_ops m52790_video_ops = {
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.s_routing = m52790_s_routing,
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};
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static const struct v4l2_subdev_ops m52790_ops = {
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.core = &m52790_core_ops,
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.audio = &m52790_audio_ops,
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.video = &m52790_video_ops,
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};
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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static int m52790_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct m52790_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%x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = kzalloc(sizeof(struct m52790_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, &m52790_ops);
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state->input = M52790_IN_TUNER;
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state->output = M52790_OUT_STEREO;
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m52790_write(sd);
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return 0;
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}
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static int m52790_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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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id m52790_id[] = {
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{ "m52790", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, m52790_id);
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static struct i2c_driver m52790_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "m52790",
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},
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.probe = m52790_probe,
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.remove = m52790_remove,
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.id_table = m52790_id,
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};
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static __init int init_m52790(void)
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{
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return i2c_add_driver(&m52790_driver);
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}
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static __exit void exit_m52790(void)
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{
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i2c_del_driver(&m52790_driver);
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}
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module_init(init_m52790);
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module_exit(exit_m52790);
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