RK3288 linux下ov摄像头驱动问题
各位大神们好！我最近在做rk3288平台上ov426+ov6946的方案。驱动在读取摄像头ID这里遇到了问题。
驱动的读i2c代码
static int ov6946_read_reg(struct i2c_client *client, u16 reg,
unsigned int len, u32 *val)
{
struct i2c_msg msg;
u8 buf= { reg >> 8, reg & 0xff };
int ret;
msg.addr = client->addr;
msg.flags = client->flags;
msg.buf = buf;
msg.len = sizeof(buf);
msg.addr = client->addr;
msg.flags = client->flags | I2C_M_RD;
msg.buf = buf;
msg.len = 1;
ret = i2c_transfer(client->adapter, msg, 2);
if (ret >= 0) {
*val = buf;
return 0;
}
dev_err(&client->dev,
"read reg:0x%x result:0x%x failed!\n", reg,buf);
return ret;
}
打印log出来是这样的
# dmesg | grep ov6946
[ 3.168255] ov6946 3-0036: driver version: 00.01.02
[ 3.168276] ov6946 3-0036: GPIO lookup for consumer reset
[ 3.168279] ov6946 3-0036: using device tree for GPIO lookup
[ 3.168299] of_get_named_gpiod_flags: parsed 'reset-gpios' property of node '/i2c@ff150000/ov6946@36' - status (0)
[ 3.168323] ov6946 3-0036: GPIO lookup for consumer pwdn
[ 3.168327] ov6946 3-0036: using device tree for GPIO lookup
[ 3.168344] of_get_named_gpiod_flags: parsed 'pwdn-gpios' property of node '/i2c@ff150000/ov6946@36' - status (0)
[ 3.168512] ov6946 3-0036: could not get default pinstate
[ 3.168517] ov6946 3-0036: could not get sleep pinstate
[ 3.168535] ov6946 3-0036: ERROR init controls(0)
[ 3.168543] ov6946 3-0036: ERROR init controls(0)
[ 3.170337] ov6946 3-0036: read reg:0x300a result:0x30 failed!
[ 3.170341] ov6946 3-0036: Unexpected sensor id(000000), ret(-6)
但奇怪的是在用户空间里可以正常读写
# i2cdetect -y 3
0123456789abcdef
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- 36 -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
# i2ctransfer -y 3 w2@0x36 0x30 0x0a r1
0x69
麻烦大神们帮忙看一下！ 顶一顶，有大神看看吗
页:
[1]