Flags for param debug as printed by modinfo are wrong. I call your
attention to the groups (dma, ioctl, file) and (i2c, irq).
>From cx18-driver.h:
#define CX18_DBGFLG_WARN (1 << 0)
#define CX18_DBGFLG_INFO (1 << 1)
#define CX18_DBGFLG_API (1 << 2)
#define CX18_DBGFLG_DMA (1 << 3)
#define CX18_DBGFLG_IOCTL (1 << 4)
#define CX18_DBGFLG_FILE (1 << 5)
#define CX18_DBGFLG_I2C (1 << 6)
#define CX18_DBGFLG_IRQ (1 << 7)
/* Flag to turn on high volume debugging */
#define CX18_DBGFLG_HIGHVOL (1 << 8)
>From cx18-driver.c:
MODULE_PARM_DESC(debug,
"Debug level (bitmask). Default: 0\n"
"\t\t\t 1/0x0001: warning\n"
"\t\t\t 2/0x0002: info\n"
"\t\t\t 4/0x0004: mailbox\n"
"\t\t\t 8/0x0008: ioctl\n"
"\t\t\t 16/0x0010: file\n"
"\t\t\t 32/0x0020: dma\n"
"\t\t\t 64/0x0040: irq\n"
"\t\t\t128/0x0080: i2c\n"
"\t\t\t256/0x0100: high volume\n");
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