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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/*
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* upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
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*
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* 2003 by T.Adachi (tadachi@tadachi-net.com)
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* 2003 by Takeru KOMORIYA <komoriya@paken.org>
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* 2006 by Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <linux/slab.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/upd64083.h>
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MODULE_DESCRIPTION("uPD64083 driver");
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MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, bool, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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enum {
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R00 = 0, R01, R02, R03, R04,
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R05, R06, R07, R08, R09,
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R0A, R0B, R0C, R0D, R0E, R0F,
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R10, R11, R12, R13, R14,
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R15, R16,
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TOT_REGS
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};
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struct upd64083_state {
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struct v4l2_subdev sd;
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u8 mode;
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u8 ext_y_adc;
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u8 regs[TOT_REGS];
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};
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static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct upd64083_state, sd);
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}
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/* Initial values when used in combination with the
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NEC upd64031a ghost reduction chip. */
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static u8 upd64083_init[] = {
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0x1f, 0x01, 0xa0, 0x2d, 0x29, /* we use EXCSS=0 */
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0x36, 0xdd, 0x05, 0x56, 0x48,
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0x00, 0x3a, 0xa0, 0x05, 0x08,
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0x44, 0x60, 0x08, 0x52, 0xf8,
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0x53, 0x60, 0x10
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};
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/* ------------------------------------------------------------------------ */
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static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 buf[2];
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buf[0] = reg;
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buf[1] = val;
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v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
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if (i2c_master_send(client, buf, 2) != 2)
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v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
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}
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/* ------------------------------------------------------------------------ */
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 buf[7];
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if (reg >= sizeof(buf))
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return 0xff;
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i2c_master_recv(client, buf, sizeof(buf));
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return buf[reg];
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}
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#endif
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/* ------------------------------------------------------------------------ */
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static int upd64083_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 upd64083_state *state = to_state(sd);
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u8 r00, r02;
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if (input > 7 || (input & 6) == 6)
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return -EINVAL;
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state->mode = (input & 3) << 6;
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state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
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r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
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r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
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upd64083_write(sd, R00, r00);
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upd64083_write(sd, R02, r02);
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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 upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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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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reg->val = upd64083_read(sd, reg->reg & 0xff);
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reg->size = 1;
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return 0;
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}
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static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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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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upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
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return 0;
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}
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#endif
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static int upd64083_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_UPD64083, 0);
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}
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static int upd64083_log_status(struct v4l2_subdev *sd)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 buf[7];
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i2c_master_recv(client, buf, 7);
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v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
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"SA04=%02x SA05=%02x SA06=%02x\n",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
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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 upd64083_core_ops = {
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.log_status = upd64083_log_status,
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.g_chip_ident = upd64083_g_chip_ident,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = upd64083_g_register,
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.s_register = upd64083_s_register,
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#endif
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};
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static const struct v4l2_subdev_video_ops upd64083_video_ops = {
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.s_routing = upd64083_s_routing,
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};
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static const struct v4l2_subdev_ops upd64083_ops = {
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.core = &upd64083_core_ops,
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.video = &upd64083_video_ops,
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};
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/* ------------------------------------------------------------------------ */
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/* i2c implementation */
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static int upd64083_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct upd64083_state *state;
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struct v4l2_subdev *sd;
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int i;
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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 upd64083_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, &upd64083_ops);
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/* Initially assume that a ghost reduction chip is present */
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state->mode = 0; /* YCS mode */
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state->ext_y_adc = (1 << 5);
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memcpy(state->regs, upd64083_init, TOT_REGS);
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for (i = 0; i < TOT_REGS; i++)
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upd64083_write(sd, i, state->regs[i]);
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return 0;
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}
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static int upd64083_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 upd64083_id[] = {
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{ "upd64083", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, upd64083_id);
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static struct i2c_driver upd64083_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "upd64083",
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},
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.probe = upd64083_probe,
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.remove = upd64083_remove,
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.id_table = upd64083_id,
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};
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static __init int init_upd64083(void)
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{
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return i2c_add_driver(&upd64083_driver);
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}
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static __exit void exit_upd64083(void)
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{
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i2c_del_driver(&upd64083_driver);
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}
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module_init(init_upd64083);
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module_exit(exit_upd64083);
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