X-Git-Url: http://git.osdn.net/view?p=android-x86%2Fexternal-wireless-tools.git;a=blobdiff_plain;f=wireless_tools%2Fwireless.h;h=fa3c64f78b32af8172ce9ac270479a3b35be1a4d;hp=0be1d51b9c4338ca884c1bea75a29e326d7721f2;hb=358fbc0574da2a7a460cfec4628e470e7affc236;hpb=b4660795a5c3dc792473889c326a30e7756e1c3b diff --git a/wireless_tools/wireless.h b/wireless_tools/wireless.h index 0be1d51..fa3c64f 100644 --- a/wireless_tools/wireless.h +++ b/wireless_tools/wireless.h @@ -1,9 +1,10 @@ /* * This file define a set of standard wireless extensions * - * Version : 7 23.4.99 + * Version : 13 6.12.01 * - * Authors : Jean Tourrilhes - HPLB - + * Authors : Jean Tourrilhes - HPL - + * Copyright (c) 1997-2001 Jean Tourrilhes, All Rights Reserved. */ #ifndef _LINUX_WIRELESS_H @@ -11,6 +12,8 @@ /************************** DOCUMENTATION **************************/ /* + * Initial APIs (1996 -> onward) : + * ----------------------------- * Basically, the wireless extensions are for now a set of standard ioctl * call + /proc/net/wireless * @@ -27,16 +30,27 @@ * We have the list of command plus a structure descibing the * data exchanged... * Note that to add these ioctl, I was obliged to modify : - * net/core/dev.c (two place + add include) - * net/ipv4/af_inet.c (one place + add include) + * # net/core/dev.c (two place + add include) + * # net/ipv4/af_inet.c (one place + add include) * * /proc/net/wireless is a copy of /proc/net/dev. * We have a structure for data passed from the driver to /proc/net/wireless * Too add this, I've modified : - * net/core/dev.c (two other places) - * include/linux/netdevice.h (one place) - * include/linux/proc_fs.h (one place) + * # net/core/dev.c (two other places) + * # include/linux/netdevice.h (one place) + * # include/linux/proc_fs.h (one place) * + * New driver API (2001 -> onward) : + * ------------------------------- + * This file is only concerned with the user space API and common definitions. + * The new driver API is defined and documented in : + * # include/net/iw_handler.h + * + * Note as well that /proc/net/wireless implementation has now moved in : + * # include/linux/wireless.c + * + * Other comments : + * -------------- * Do not add here things that are redundant with other mechanisms * (drivers init, ifconfig, /proc/net/dev, ...) and with are not * wireless specific. @@ -50,22 +64,18 @@ /***************************** INCLUDES *****************************/ -#if 0 #include /* for "caddr_t" et al */ #include /* for "struct sockaddr" et al */ #include /* for IFNAMSIZ and co... */ -#endif - -/**************************** CONSTANTS ****************************/ -/* --------------------------- VERSION --------------------------- */ +/***************************** VERSION *****************************/ /* * This constant is used to know the availability of the wireless * extensions and to know which version of wireless extensions it is * (there is some stuff that will be added in the future...) * I just plan to increment with each new version. */ -#define WIRELESS_EXT 6 +#define WIRELESS_EXT 13 /* * Changes : @@ -92,51 +102,137 @@ * V6 to V7 * -------- * - define IW_ESSID_MAX_SIZE and IW_MAX_AP + * + * V7 to V8 + * -------- + * - Changed my e-mail address + * - More 802.11 support (nickname, rate, rts, frag) + * - List index in frequencies + * + * V8 to V9 + * -------- + * - Support for 'mode of operation' (ad-hoc, managed...) + * - Support for unicast and multicast power saving + * - Change encoding to support larger tokens (>64 bits) + * - Updated iw_params (disable, flags) and use it for NWID + * - Extracted iw_point from iwreq for clarity + * + * V9 to V10 + * --------- + * - Add PM capability to range structure + * - Add PM modifier : MAX/MIN/RELATIVE + * - Add encoding option : IW_ENCODE_NOKEY + * - Add TxPower ioctls (work like TxRate) + * + * V10 to V11 + * ---------- + * - Add WE version in range (help backward/forward compatibility) + * - Add retry ioctls (work like PM) + * + * V11 to V12 + * ---------- + * - Add SIOCSIWSTATS to get /proc/net/wireless programatically + * - Add DEV PRIVATE IOCTL to avoid collisions in SIOCDEVPRIVATE space + * - Add new statistics (frag, retry, beacon) + * - Add average quality (for user space calibration) + * + * V12 to V13 + * ---------- + * - Document creation of new driver API. + * - Extract union iwreq_data from struct iwreq (for new driver API). + * - Rename SIOCSIWNAME as SIOCSIWCOMMIT */ +/**************************** CONSTANTS ****************************/ + /* -------------------------- IOCTL LIST -------------------------- */ /* Basic operations */ -#define SIOCSIWNAME 0x8B00 /* Unused ??? */ -#define SIOCGIWNAME 0x8B01 /* get name */ -#define SIOCSIWNWID 0x8B02 /* set network id */ +#define SIOCSIWCOMMIT 0x8B00 /* Commit pending changes to driver */ +#define SIOCGIWNAME 0x8B01 /* get name == wireless protocol */ +#define SIOCSIWNWID 0x8B02 /* set network id (the cell) */ #define SIOCGIWNWID 0x8B03 /* get network id */ -#define SIOCSIWFREQ 0x8B04 /* set channel/frequency */ -#define SIOCGIWFREQ 0x8B05 /* get channel/frequency */ -#define SIOCSIWENCODE 0x8B06 /* set encoding info */ -#define SIOCGIWENCODE 0x8B07 /* get encoding info */ -#define SIOCSIWSENS 0x8B08 /* set sensitivity */ -#define SIOCGIWSENS 0x8B09 /* get sensitivity */ +#define SIOCSIWFREQ 0x8B04 /* set channel/frequency (Hz) */ +#define SIOCGIWFREQ 0x8B05 /* get channel/frequency (Hz) */ +#define SIOCSIWMODE 0x8B06 /* set operation mode */ +#define SIOCGIWMODE 0x8B07 /* get operation mode */ +#define SIOCSIWSENS 0x8B08 /* set sensitivity (dBm) */ +#define SIOCGIWSENS 0x8B09 /* get sensitivity (dBm) */ /* Informative stuff */ -#define SIOCSIWRANGE 0x8B0A /* Unused ??? */ +#define SIOCSIWRANGE 0x8B0A /* Unused */ #define SIOCGIWRANGE 0x8B0B /* Get range of parameters */ -#define SIOCSIWPRIV 0x8B0C /* Unused ??? */ +#define SIOCSIWPRIV 0x8B0C /* Unused */ #define SIOCGIWPRIV 0x8B0D /* get private ioctl interface info */ +#define SIOCSIWSTATS 0x8B0E /* Unused */ +#define SIOCGIWSTATS 0x8B0F /* Get /proc/net/wireless stats */ /* Mobile IP support */ #define SIOCSIWSPY 0x8B10 /* set spy addresses */ #define SIOCGIWSPY 0x8B11 /* get spy info (quality of link) */ /* Access Point manipulation */ -#define SIOCSIWAP 0x8B14 /* set access point hardware addresses */ -#define SIOCGIWAP 0x8B15 /* get access point hardware addresses */ +#define SIOCSIWAP 0x8B14 /* set access point MAC addresses */ +#define SIOCGIWAP 0x8B15 /* get access point MAC addresses */ #define SIOCGIWAPLIST 0x8B17 /* get list of access point in range */ /* 802.11 specific support */ #define SIOCSIWESSID 0x8B1A /* set ESSID (network name) */ #define SIOCGIWESSID 0x8B1B /* get ESSID */ -/* As the ESSID is a string up to 32 bytes long, it doesn't fit within the - * 'iwreq' structure, so we need to use the 'data' member to point to a - * string in user space, like it is done for RANGE... - * The "flags" member indicate if the ESSID is active or not. +#define SIOCSIWNICKN 0x8B1C /* set node name/nickname */ +#define SIOCGIWNICKN 0x8B1D /* get node name/nickname */ +/* As the ESSID and NICKN are strings up to 32 bytes long, it doesn't fit + * within the 'iwreq' structure, so we need to use the 'data' member to + * point to a string in user space, like it is done for RANGE... + * The "flags" member indicate if the ESSID is active or not (promiscuous). + */ + +/* Other parameters useful in 802.11 and some other devices */ +#define SIOCSIWRATE 0x8B20 /* set default bit rate (bps) */ +#define SIOCGIWRATE 0x8B21 /* get default bit rate (bps) */ +#define SIOCSIWRTS 0x8B22 /* set RTS/CTS threshold (bytes) */ +#define SIOCGIWRTS 0x8B23 /* get RTS/CTS threshold (bytes) */ +#define SIOCSIWFRAG 0x8B24 /* set fragmentation thr (bytes) */ +#define SIOCGIWFRAG 0x8B25 /* get fragmentation thr (bytes) */ +#define SIOCSIWTXPOW 0x8B26 /* set transmit power (dBm) */ +#define SIOCGIWTXPOW 0x8B27 /* get transmit power (dBm) */ +#define SIOCSIWRETRY 0x8B28 /* set retry limits and lifetime */ +#define SIOCGIWRETRY 0x8B29 /* get retry limits and lifetime */ + +/* Encoding stuff (scrambling, hardware security, WEP...) */ +#define SIOCSIWENCODE 0x8B2A /* set encoding token & mode */ +#define SIOCGIWENCODE 0x8B2B /* get encoding token & mode */ +/* Power saving stuff (power management, unicast and multicast) */ +#define SIOCSIWPOWER 0x8B2C /* set Power Management settings */ +#define SIOCGIWPOWER 0x8B2D /* get Power Management settings */ + +/* -------------------- DEV PRIVATE IOCTL LIST -------------------- */ + +/* These 16 ioctl are wireless device private. + * Each driver is free to use them for whatever purpose it chooses, + * however the driver *must* export the description of those ioctls + * with SIOCGIWPRIV and *must* use arguments as defined below. + * If you don't follow those rules, DaveM is going to hate you (reason : + * it make mixed 32/64bit operation impossible). + */ +#define SIOCIWFIRSTPRIV 0x8BE0 +#define SIOCIWLASTPRIV 0x8BFF +/* Previously, we were using SIOCDEVPRIVATE, but we now have our + * separate range because of collisions with other tools such as + * 'mii-tool'. + * We now have 32 commands, so a bit more space ;-). + * Also, all 'odd' commands are only usable by root and don't return the + * content of ifr/iwr to user (but you are not obliged to use the set/get + * convention, just use every other two command). + * And I repeat : you are not obliged to use them with iwspy, but you + * must be compliant with it. */ /* ------------------------- IOCTL STUFF ------------------------- */ /* The first and the last (range) */ #define SIOCIWFIRST 0x8B00 -#define SIOCIWLAST 0x8B1B +#define SIOCIWLAST SIOCIWLASTPRIV /* 0x8BFF */ /* Even : get (world access), odd : set (root access) */ #define IW_IS_SET(cmd) (!((cmd) & 0x1)) @@ -146,7 +242,7 @@ /* * The following is used with SIOCGIWPRIV. It allow a driver to define * the interface (name, type of data) for its private ioctl. - * Privates ioctl are SIOCDEVPRIVATE -> SIOCDEVPRIVATE + 0xF + * Privates ioctl are SIOCIWFIRSTPRIV -> SIOCIWLASTPRIV */ #define IW_PRIV_TYPE_MASK 0x7000 /* Type of arguments */ @@ -173,6 +269,12 @@ * don't increase this constant and don't fill the frequency list. * The user will be able to set by channel anyway... */ +/* Maximum bit rates in the range struct */ +#define IW_MAX_BITRATES 8 + +/* Maximum tx powers in the range struct */ +#define IW_MAX_TXPOWER 8 + /* Maximum of address that you may set with SPY */ #define IW_MAX_SPY 8 @@ -180,23 +282,102 @@ list of access points in range */ #define IW_MAX_AP 8 -/* Maximum size of the ESSID string */ +/* Maximum size of the ESSID and NICKN strings */ #define IW_ESSID_MAX_SIZE 32 +/* Modes of operation */ +#define IW_MODE_AUTO 0 /* Let the driver decides */ +#define IW_MODE_ADHOC 1 /* Single cell network */ +#define IW_MODE_INFRA 2 /* Multi cell network, roaming, ... */ +#define IW_MODE_MASTER 3 /* Synchronisation master or Access Point */ +#define IW_MODE_REPEAT 4 /* Wireless Repeater (forwarder) */ +#define IW_MODE_SECOND 5 /* Secondary master/repeater (backup) */ + +/* Maximum number of size of encoding token available + * they are listed in the range structure */ +#define IW_MAX_ENCODING_SIZES 8 + +/* Maximum size of the encoding token in bytes */ +#define IW_ENCODING_TOKEN_MAX 32 /* 256 bits (for now) */ + +/* Flags for encoding (along with the token) */ +#define IW_ENCODE_INDEX 0x00FF /* Token index (if needed) */ +#define IW_ENCODE_FLAGS 0xFF00 /* Flags defined below */ +#define IW_ENCODE_MODE 0xF000 /* Modes defined below */ +#define IW_ENCODE_DISABLED 0x8000 /* Encoding disabled */ +#define IW_ENCODE_ENABLED 0x0000 /* Encoding enabled */ +#define IW_ENCODE_RESTRICTED 0x4000 /* Refuse non-encoded packets */ +#define IW_ENCODE_OPEN 0x2000 /* Accept non-encoded packets */ +#define IW_ENCODE_NOKEY 0x0800 /* Key is write only, so not present */ + +/* Power management flags available (along with the value, if any) */ +#define IW_POWER_ON 0x0000 /* No details... */ +#define IW_POWER_TYPE 0xF000 /* Type of parameter */ +#define IW_POWER_PERIOD 0x1000 /* Value is a period/duration of */ +#define IW_POWER_TIMEOUT 0x2000 /* Value is a timeout (to go asleep) */ +#define IW_POWER_MODE 0x0F00 /* Power Management mode */ +#define IW_POWER_UNICAST_R 0x0100 /* Receive only unicast messages */ +#define IW_POWER_MULTICAST_R 0x0200 /* Receive only multicast messages */ +#define IW_POWER_ALL_R 0x0300 /* Receive all messages though PM */ +#define IW_POWER_FORCE_S 0x0400 /* Force PM procedure for sending unicast */ +#define IW_POWER_REPEATER 0x0800 /* Repeat broadcast messages in PM period */ +#define IW_POWER_MODIFIER 0x000F /* Modify a parameter */ +#define IW_POWER_MIN 0x0001 /* Value is a minimum */ +#define IW_POWER_MAX 0x0002 /* Value is a maximum */ +#define IW_POWER_RELATIVE 0x0004 /* Value is not in seconds/ms/us */ + +/* Transmit Power flags available */ +#define IW_TXPOW_DBM 0x0000 /* Value is in dBm */ +#define IW_TXPOW_MWATT 0x0001 /* Value is in mW */ + +/* Retry limits and lifetime flags available */ +#define IW_RETRY_ON 0x0000 /* No details... */ +#define IW_RETRY_TYPE 0xF000 /* Type of parameter */ +#define IW_RETRY_LIMIT 0x1000 /* Maximum number of retries*/ +#define IW_RETRY_LIFETIME 0x2000 /* Maximum duration of retries in us */ +#define IW_RETRY_MODIFIER 0x000F /* Modify a parameter */ +#define IW_RETRY_MIN 0x0001 /* Value is a minimum */ +#define IW_RETRY_MAX 0x0002 /* Value is a maximum */ +#define IW_RETRY_RELATIVE 0x0004 /* Value is not in seconds/ms/us */ + /****************************** TYPES ******************************/ /* --------------------------- SUBTYPES --------------------------- */ /* + * Generic format for most parameters that fit in an int + */ +struct iw_param +{ + __s32 value; /* The value of the parameter itself */ + __u8 fixed; /* Hardware should not use auto select */ + __u8 disabled; /* Disable the feature */ + __u16 flags; /* Various specifc flags (if any) */ +}; + +/* + * For all data larger than 16 octets, we need to use a + * pointer to memory allocated in user space. + */ +struct iw_point +{ + caddr_t pointer; /* Pointer to the data (in user space) */ + __u16 length; /* number of fields or size in bytes */ + __u16 flags; /* Optional params */ +}; + +/* * A frequency - * For numbers lower than 10^9, we encode the number in 'mant' and - * set 'exp' to 0 - * For number greater than 10^9, we divide it by a power of 10. - * The power of 10 is in 'exp', the result is in 'mant'. + * For numbers lower than 10^9, we encode the number in 'm' and + * set 'e' to 0 + * For number greater than 10^9, we divide it by the lowest power + * of 10 to get 'm' lower than 10^9, with 'm'= f / (10^'e')... + * The power of 10 is in 'e', the result of the division is in 'm'. */ struct iw_freq { __u32 m; /* Mantissa */ __u16 e; /* Exponent */ + __u8 i; /* List index (when in range struct) */ }; /* @@ -204,97 +385,108 @@ struct iw_freq */ struct iw_quality { - __u8 qual; /* link quality (SNR or better...) */ - __u8 level; /* signal level */ - __u8 noise; /* noise level */ + __u8 qual; /* link quality (%retries, SNR, + %missed beacons or better...) */ + __u8 level; /* signal level (dBm) */ + __u8 noise; /* noise level (dBm) */ __u8 updated; /* Flags to know if updated */ }; /* * Packet discarded in the wireless adapter due to * "wireless" specific problems... + * Note : the list of counter and statistics in net_device_stats + * is already pretty exhaustive, and you should use that first. + * This is only additional stats... */ struct iw_discarded { - __u32 nwid; /* Wrong nwid */ - __u32 code; /* Unable to code/decode */ + __u32 nwid; /* Rx : Wrong nwid/essid */ + __u32 code; /* Rx : Unable to code/decode (WEP) */ + __u32 fragment; /* Rx : Can't perform MAC reassembly */ + __u32 retries; /* Tx : Max MAC retries num reached */ __u32 misc; /* Others cases */ }; /* - * Encoding information (setting and so on) - * Encoding might be hardware encryption, scrambing or others + * Packet/Time period missed in the wireless adapter due to + * "wireless" specific problems... */ -struct iw_encoding +struct iw_missed { - __u8 method; /* Algorithm number / key used */ - __u64 code; /* Data/key used for algorithm */ + __u32 beacon; /* Missed beacons/superframe */ }; - /* ------------------------ WIRELESS STATS ------------------------ */ /* * Wireless statistics (used for /proc/net/wireless) */ struct iw_statistics { - __u8 status; /* Status + __u16 status; /* Status * - device dependent for now */ struct iw_quality qual; /* Quality of the link * (instant/mean/max) */ struct iw_discarded discard; /* Packet discarded counts */ + struct iw_missed miss; /* Packet missed counts */ }; /* ------------------------ IOCTL REQUEST ------------------------ */ /* - * The structure to exchange data for ioctl. - * This structure is the same as 'struct ifreq', but (re)defined for - * convenience... + * This structure defines the payload of an ioctl, and is used + * below. * - * Note that it should fit on the same memory footprint ! - * You should check this when increasing the above structures (16 octets) + * Note that this structure should fit on the memory footprint + * of iwreq (which is the same as ifreq), which mean a max size of * 16 octets = 128 bits. Warning, pointers might be 64 bits wide... + * You should check this when increasing the structures defined + * above in this file... */ -struct iwreq +union iwreq_data { - union - { - char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */ - } ifr_ifrn; - - /* Data part */ - union - { - /* Config - generic */ - char name[IFNAMSIZ]; - /* Name : used to verify the presence of wireless extensions. - * Name of the protocol/provider... */ - - struct /* network id (or domain) : used to to */ - { /* create logical channels on the air */ - __u32 nwid; /* value */ - __u8 on; /* active/unactive nwid */ - } nwid; - - struct iw_freq freq; /* frequency or channel : + /* Config - generic */ + char name[IFNAMSIZ]; + /* Name : used to verify the presence of wireless extensions. + * Name of the protocol/provider... */ + + struct iw_point essid; /* Extended network name */ + struct iw_param nwid; /* network id (or domain - the cell) */ + struct iw_freq freq; /* frequency or channel : * 0-1000 = channel * > 1000 = frequency in Hz */ - struct iw_encoding encoding; /* Encoding stuff */ + struct iw_param sens; /* signal level threshold */ + struct iw_param bitrate; /* default bit rate */ + struct iw_param txpower; /* default transmit power */ + struct iw_param rts; /* RTS threshold threshold */ + struct iw_param frag; /* Fragmentation threshold */ + __u32 mode; /* Operation mode */ + struct iw_param retry; /* Retry limits & lifetime */ - __u32 sensitivity; /* signal level threshold */ + struct iw_point encoding; /* Encoding stuff : tokens */ + struct iw_param power; /* PM duration/timeout */ - struct sockaddr ap_addr; /* Access point address */ + struct sockaddr ap_addr; /* Access point address */ - struct /* For all data bigger than 16 octets */ - { - caddr_t pointer; /* Pointer to the data - * (in user space) */ - __u16 length; /* fields or byte size */ - __u16 flags; /* Optional params */ - } data; - } u; + struct iw_point data; /* Other large parameters */ +}; + +/* + * The structure to exchange data for ioctl. + * This structure is the same as 'struct ifreq', but (re)defined for + * convenience... + * Do I need to remind you about structure size (32 octets) ? + */ +struct iwreq +{ + union + { + char ifrn_name[IFNAMSIZ]; /* if name, e.g. "eth0" */ + } ifr_ifrn; + + /* Data part (defined just above) */ + union iwreq_data u; }; /* -------------------------- IOCTL DATA -------------------------- */ @@ -311,6 +503,12 @@ struct iw_range { /* Informative stuff (to choose between different interface) */ __u32 throughput; /* To give an idea... */ + /* In theory this value should be the maximum benchmarked + * TCP/IP throughput, because with most of these devices the + * bit rate is meaningless (overhead an co) to estimate how + * fast the connection will go and pick the fastest one. + * I suggest people to play with Netperf or any benchmark... + */ /* NWID (or domain id) */ __u32 min_nwid; /* Minimal NWID we are able to set */ @@ -323,13 +521,67 @@ struct iw_range /* Note : this frequency list doesn't need to fit channel numbers */ /* signal level threshold range */ - __u32 sensitivity; + __s32 sensitivity; /* Quality of link & SNR stuff */ struct iw_quality max_qual; /* Quality of the link */ + /* Rates */ + __u8 num_bitrates; /* Number of entries in the list */ + __s32 bitrate[IW_MAX_BITRATES]; /* list, in bps */ + + /* RTS threshold */ + __s32 min_rts; /* Minimal RTS threshold */ + __s32 max_rts; /* Maximal RTS threshold */ + + /* Frag threshold */ + __s32 min_frag; /* Minimal frag threshold */ + __s32 max_frag; /* Maximal frag threshold */ + + /* Power Management duration & timeout */ + __s32 min_pmp; /* Minimal PM period */ + __s32 max_pmp; /* Maximal PM period */ + __s32 min_pmt; /* Minimal PM timeout */ + __s32 max_pmt; /* Maximal PM timeout */ + __u16 pmp_flags; /* How to decode max/min PM period */ + __u16 pmt_flags; /* How to decode max/min PM timeout */ + __u16 pm_capa; /* What PM options are supported */ + /* Encoder stuff */ - struct iw_encoding max_encoding; /* Encoding max range */ + __u16 encoding_size[IW_MAX_ENCODING_SIZES]; /* Different token sizes */ + __u8 num_encoding_sizes; /* Number of entry in the list */ + __u8 max_encoding_tokens; /* Max number of tokens */ + + /* Transmit power */ + __u16 txpower_capa; /* What options are supported */ + __u8 num_txpower; /* Number of entries in the list */ + __s32 txpower[IW_MAX_TXPOWER]; /* list, in bps */ + + /* Wireless Extension version info */ + __u8 we_version_compiled; /* Must be WIRELESS_EXT */ + __u8 we_version_source; /* Last update of source */ + + /* Retry limits and lifetime */ + __u16 retry_capa; /* What retry options are supported */ + __u16 retry_flags; /* How to decode max/min retry limit */ + __u16 r_time_flags; /* How to decode max/min retry life */ + __s32 min_retry; /* Minimal number of retries */ + __s32 max_retry; /* Maximal number of retries */ + __s32 min_r_time; /* Minimal retry lifetime */ + __s32 max_r_time; /* Maximal retry lifetime */ + + /* Average quality of link & SNR */ + struct iw_quality avg_qual; /* Quality of the link */ + /* This should contain the average/typical values of the quality + * indicator. This should be the threshold between a "good" and + * a "bad" link (example : monitor going from green to orange). + * Currently, user space apps like quality monitors don't have any + * way to calibrate the measurement. With this, they can split + * the range between 0 and max_qual in different quality level + * (using a geometric subdivision centered on the average). + * I expect that people doing the user space apps will feedback + * us on which value we need to put in each driver... + */ }; /*