564 lines
13 KiB
C
564 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2005 Mike Isely <isely@pobox.com>
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*/
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#include "pvrusb2-ctrl.h"
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#include "pvrusb2-hdw-internal.h"
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mutex.h>
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static int pvr2_ctrl_range_check(struct pvr2_ctrl *cptr,int val)
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{
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if (cptr->info->check_value) {
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if (!cptr->info->check_value(cptr,val)) return -ERANGE;
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} else if (cptr->info->type == pvr2_ctl_enum) {
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if (val < 0) return -ERANGE;
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if (val >= cptr->info->def.type_enum.count) return -ERANGE;
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} else {
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int lim;
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lim = cptr->info->def.type_int.min_value;
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if (cptr->info->get_min_value) {
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cptr->info->get_min_value(cptr,&lim);
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}
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if (val < lim) return -ERANGE;
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lim = cptr->info->def.type_int.max_value;
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if (cptr->info->get_max_value) {
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cptr->info->get_max_value(cptr,&lim);
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}
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if (val > lim) return -ERANGE;
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}
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return 0;
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}
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/* Set the given control. */
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int pvr2_ctrl_set_value(struct pvr2_ctrl *cptr,int val)
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{
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return pvr2_ctrl_set_mask_value(cptr,~0,val);
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}
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/* Set/clear specific bits of the given control. */
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int pvr2_ctrl_set_mask_value(struct pvr2_ctrl *cptr,int mask,int val)
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{
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int ret = 0;
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if (!cptr) return -EINVAL;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->set_value) {
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if (cptr->info->type == pvr2_ctl_bitmask) {
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mask &= cptr->info->def.type_bitmask.valid_bits;
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} else if ((cptr->info->type == pvr2_ctl_int)||
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(cptr->info->type == pvr2_ctl_enum)) {
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ret = pvr2_ctrl_range_check(cptr,val);
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if (ret < 0) break;
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} else if (cptr->info->type != pvr2_ctl_bool) {
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break;
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}
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ret = cptr->info->set_value(cptr,mask,val);
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} else {
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ret = -EPERM;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Get the current value of the given control. */
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int pvr2_ctrl_get_value(struct pvr2_ctrl *cptr,int *valptr)
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{
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int ret = 0;
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if (!cptr) return -EINVAL;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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ret = cptr->info->get_value(cptr,valptr);
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve control's type */
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enum pvr2_ctl_type pvr2_ctrl_get_type(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return pvr2_ctl_int;
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return cptr->info->type;
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}
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/* Retrieve control's maximum value (int type) */
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int pvr2_ctrl_get_max(struct pvr2_ctrl *cptr)
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{
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int ret = 0;
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if (!cptr) return 0;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->get_max_value) {
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cptr->info->get_max_value(cptr,&ret);
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} else if (cptr->info->type == pvr2_ctl_int) {
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ret = cptr->info->def.type_int.max_value;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve control's minimum value (int type) */
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int pvr2_ctrl_get_min(struct pvr2_ctrl *cptr)
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{
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int ret = 0;
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if (!cptr) return 0;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->get_min_value) {
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cptr->info->get_min_value(cptr,&ret);
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} else if (cptr->info->type == pvr2_ctl_int) {
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ret = cptr->info->def.type_int.min_value;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve control's default value (any type) */
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int pvr2_ctrl_get_def(struct pvr2_ctrl *cptr, int *valptr)
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{
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int ret = 0;
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if (!cptr) return -EINVAL;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->get_def_value) {
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ret = cptr->info->get_def_value(cptr, valptr);
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} else {
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*valptr = cptr->info->default_value;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve control's enumeration count (enum only) */
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int pvr2_ctrl_get_cnt(struct pvr2_ctrl *cptr)
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{
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int ret = 0;
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if (!cptr) return 0;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->type == pvr2_ctl_enum) {
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ret = cptr->info->def.type_enum.count;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve control's valid mask bits (bit mask only) */
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int pvr2_ctrl_get_mask(struct pvr2_ctrl *cptr)
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{
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int ret = 0;
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if (!cptr) return 0;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->type == pvr2_ctl_bitmask) {
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ret = cptr->info->def.type_bitmask.valid_bits;
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Retrieve the control's name */
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const char *pvr2_ctrl_get_name(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return NULL;
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return cptr->info->name;
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}
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/* Retrieve the control's desc */
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const char *pvr2_ctrl_get_desc(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return NULL;
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return cptr->info->desc;
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}
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/* Retrieve a control enumeration or bit mask value */
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int pvr2_ctrl_get_valname(struct pvr2_ctrl *cptr,int val,
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char *bptr,unsigned int bmax,
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unsigned int *blen)
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{
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int ret = -EINVAL;
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if (!cptr) return 0;
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*blen = 0;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->type == pvr2_ctl_enum) {
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const char * const *names;
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names = cptr->info->def.type_enum.value_names;
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if (pvr2_ctrl_range_check(cptr,val) == 0) {
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if (names[val]) {
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*blen = scnprintf(
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bptr,bmax,"%s",
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names[val]);
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} else {
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*blen = 0;
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}
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ret = 0;
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}
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} else if (cptr->info->type == pvr2_ctl_bitmask) {
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const char **names;
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unsigned int idx;
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int msk;
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names = cptr->info->def.type_bitmask.bit_names;
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val &= cptr->info->def.type_bitmask.valid_bits;
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for (idx = 0, msk = 1; val; idx++, msk <<= 1) {
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if (val & msk) {
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*blen = scnprintf(bptr,bmax,"%s",
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names[idx]);
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ret = 0;
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break;
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}
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}
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Return V4L ID for this control or zero if none */
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int pvr2_ctrl_get_v4lid(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return 0;
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return cptr->info->v4l_id;
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}
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unsigned int pvr2_ctrl_get_v4lflags(struct pvr2_ctrl *cptr)
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{
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unsigned int flags = 0;
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if (cptr->info->get_v4lflags) {
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flags = cptr->info->get_v4lflags(cptr);
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}
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if (cptr->info->set_value) {
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flags &= ~V4L2_CTRL_FLAG_READ_ONLY;
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} else {
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flags |= V4L2_CTRL_FLAG_READ_ONLY;
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}
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return flags;
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}
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/* Return true if control is writable */
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int pvr2_ctrl_is_writable(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return 0;
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return cptr->info->set_value != NULL;
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}
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/* Return true if control has custom symbolic representation */
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int pvr2_ctrl_has_custom_symbols(struct pvr2_ctrl *cptr)
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{
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if (!cptr) return 0;
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if (!cptr->info->val_to_sym) return 0;
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if (!cptr->info->sym_to_val) return 0;
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return !0;
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}
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/* Convert a given mask/val to a custom symbolic value */
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int pvr2_ctrl_custom_value_to_sym(struct pvr2_ctrl *cptr,
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int mask,int val,
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char *buf,unsigned int maxlen,
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unsigned int *len)
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{
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if (!cptr) return -EINVAL;
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if (!cptr->info->val_to_sym) return -EINVAL;
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return cptr->info->val_to_sym(cptr,mask,val,buf,maxlen,len);
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}
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/* Convert a symbolic value to a mask/value pair */
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int pvr2_ctrl_custom_sym_to_value(struct pvr2_ctrl *cptr,
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const char *buf,unsigned int len,
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int *maskptr,int *valptr)
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{
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if (!cptr) return -EINVAL;
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if (!cptr->info->sym_to_val) return -EINVAL;
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return cptr->info->sym_to_val(cptr,buf,len,maskptr,valptr);
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}
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static unsigned int gen_bitmask_string(int msk,int val,int msk_only,
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const char **names,
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char *ptr,unsigned int len)
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{
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unsigned int idx;
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long sm,um;
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int spcFl;
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unsigned int uc,cnt;
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const char *idStr;
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spcFl = 0;
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uc = 0;
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um = 0;
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for (idx = 0, sm = 1; msk; idx++, sm <<= 1) {
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if (sm & msk) {
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msk &= ~sm;
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idStr = names[idx];
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if (idStr) {
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cnt = scnprintf(ptr,len,"%s%s%s",
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(spcFl ? " " : ""),
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(msk_only ? "" :
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((val & sm) ? "+" : "-")),
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idStr);
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ptr += cnt; len -= cnt; uc += cnt;
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spcFl = !0;
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} else {
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um |= sm;
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}
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}
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}
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if (um) {
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if (msk_only) {
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cnt = scnprintf(ptr,len,"%s0x%lx",
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(spcFl ? " " : ""),
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um);
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ptr += cnt; len -= cnt; uc += cnt;
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spcFl = !0;
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} else if (um & val) {
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cnt = scnprintf(ptr,len,"%s+0x%lx",
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(spcFl ? " " : ""),
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um & val);
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ptr += cnt; len -= cnt; uc += cnt;
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spcFl = !0;
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} else if (um & ~val) {
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cnt = scnprintf(ptr,len,"%s+0x%lx",
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(spcFl ? " " : ""),
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um & ~val);
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ptr += cnt; len -= cnt; uc += cnt;
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spcFl = !0;
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}
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}
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return uc;
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}
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static const char *boolNames[] = {
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"false",
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"true",
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"no",
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"yes",
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};
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static int parse_token(const char *ptr,unsigned int len,
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int *valptr,
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const char * const *names, unsigned int namecnt)
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{
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unsigned int slen;
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unsigned int idx;
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*valptr = 0;
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if (!names) namecnt = 0;
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for (idx = 0; idx < namecnt; idx++) {
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if (!names[idx]) continue;
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slen = strlen(names[idx]);
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if (slen != len) continue;
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if (memcmp(names[idx],ptr,slen)) continue;
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*valptr = idx;
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return 0;
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}
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return kstrtoint(ptr, 0, valptr) ? -EINVAL : 1;
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}
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static int parse_mtoken(const char *ptr,unsigned int len,
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int *valptr,
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const char **names,int valid_bits)
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{
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unsigned int slen;
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unsigned int idx;
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int msk;
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*valptr = 0;
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for (idx = 0, msk = 1; valid_bits; idx++, msk <<= 1) {
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if (!(msk & valid_bits)) continue;
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valid_bits &= ~msk;
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if (!names[idx]) continue;
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slen = strlen(names[idx]);
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if (slen != len) continue;
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if (memcmp(names[idx],ptr,slen)) continue;
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*valptr = msk;
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return 0;
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}
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return kstrtoint(ptr, 0, valptr);
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}
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static int parse_tlist(const char *ptr,unsigned int len,
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int *maskptr,int *valptr,
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const char **names,int valid_bits)
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{
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unsigned int cnt;
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int mask,val,kv,mode,ret;
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mask = 0;
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val = 0;
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ret = 0;
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while (len) {
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cnt = 0;
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while ((cnt < len) &&
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((ptr[cnt] <= 32) ||
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(ptr[cnt] >= 127))) cnt++;
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ptr += cnt;
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len -= cnt;
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mode = 0;
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if ((*ptr == '-') || (*ptr == '+')) {
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mode = (*ptr == '-') ? -1 : 1;
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ptr++;
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len--;
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}
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cnt = 0;
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while (cnt < len) {
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if (ptr[cnt] <= 32) break;
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if (ptr[cnt] >= 127) break;
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cnt++;
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}
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if (!cnt) break;
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if (parse_mtoken(ptr,cnt,&kv,names,valid_bits)) {
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ret = -EINVAL;
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break;
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}
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ptr += cnt;
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len -= cnt;
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switch (mode) {
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case 0:
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mask = valid_bits;
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val |= kv;
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break;
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case -1:
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mask |= kv;
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val &= ~kv;
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break;
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case 1:
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mask |= kv;
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val |= kv;
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break;
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default:
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break;
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}
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}
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*maskptr = mask;
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*valptr = val;
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return ret;
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}
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/* Convert a symbolic value to a mask/value pair */
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int pvr2_ctrl_sym_to_value(struct pvr2_ctrl *cptr,
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const char *ptr,unsigned int len,
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int *maskptr,int *valptr)
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{
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int ret = -EINVAL;
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unsigned int cnt;
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*maskptr = 0;
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*valptr = 0;
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cnt = 0;
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while ((cnt < len) && ((ptr[cnt] <= 32) || (ptr[cnt] >= 127))) cnt++;
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len -= cnt; ptr += cnt;
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cnt = 0;
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while ((cnt < len) && ((ptr[len-(cnt+1)] <= 32) ||
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(ptr[len-(cnt+1)] >= 127))) cnt++;
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len -= cnt;
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if (!len) return -EINVAL;
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LOCK_TAKE(cptr->hdw->big_lock); do {
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if (cptr->info->type == pvr2_ctl_int) {
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ret = parse_token(ptr,len,valptr,NULL,0);
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if (ret >= 0) {
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ret = pvr2_ctrl_range_check(cptr,*valptr);
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}
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*maskptr = ~0;
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} else if (cptr->info->type == pvr2_ctl_bool) {
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ret = parse_token(ptr,len,valptr,boolNames,
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ARRAY_SIZE(boolNames));
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if (ret == 1) {
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*valptr = *valptr ? !0 : 0;
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} else if (ret == 0) {
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*valptr = (*valptr & 1) ? !0 : 0;
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}
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*maskptr = 1;
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} else if (cptr->info->type == pvr2_ctl_enum) {
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ret = parse_token(
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ptr,len,valptr,
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cptr->info->def.type_enum.value_names,
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cptr->info->def.type_enum.count);
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if (ret >= 0) {
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ret = pvr2_ctrl_range_check(cptr,*valptr);
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}
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*maskptr = ~0;
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} else if (cptr->info->type == pvr2_ctl_bitmask) {
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ret = parse_tlist(
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ptr,len,maskptr,valptr,
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cptr->info->def.type_bitmask.bit_names,
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cptr->info->def.type_bitmask.valid_bits);
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}
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} while(0); LOCK_GIVE(cptr->hdw->big_lock);
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return ret;
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}
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/* Convert a given mask/val to a symbolic value */
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int pvr2_ctrl_value_to_sym_internal(struct pvr2_ctrl *cptr,
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int mask,int val,
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char *buf,unsigned int maxlen,
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unsigned int *len)
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{
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int ret = -EINVAL;
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*len = 0;
|
|
if (cptr->info->type == pvr2_ctl_int) {
|
|
*len = scnprintf(buf,maxlen,"%d",val);
|
|
ret = 0;
|
|
} else if (cptr->info->type == pvr2_ctl_bool) {
|
|
*len = scnprintf(buf,maxlen,"%s",val ? "true" : "false");
|
|
ret = 0;
|
|
} else if (cptr->info->type == pvr2_ctl_enum) {
|
|
const char * const *names;
|
|
names = cptr->info->def.type_enum.value_names;
|
|
if ((val >= 0) &&
|
|
(val < cptr->info->def.type_enum.count)) {
|
|
if (names[val]) {
|
|
*len = scnprintf(
|
|
buf,maxlen,"%s",
|
|
names[val]);
|
|
} else {
|
|
*len = 0;
|
|
}
|
|
ret = 0;
|
|
}
|
|
} else if (cptr->info->type == pvr2_ctl_bitmask) {
|
|
*len = gen_bitmask_string(
|
|
val & mask & cptr->info->def.type_bitmask.valid_bits,
|
|
~0,!0,
|
|
cptr->info->def.type_bitmask.bit_names,
|
|
buf,maxlen);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Convert a given mask/val to a symbolic value */
|
|
int pvr2_ctrl_value_to_sym(struct pvr2_ctrl *cptr,
|
|
int mask,int val,
|
|
char *buf,unsigned int maxlen,
|
|
unsigned int *len)
|
|
{
|
|
int ret;
|
|
LOCK_TAKE(cptr->hdw->big_lock); do {
|
|
ret = pvr2_ctrl_value_to_sym_internal(cptr,mask,val,
|
|
buf,maxlen,len);
|
|
} while(0); LOCK_GIVE(cptr->hdw->big_lock);
|
|
return ret;
|
|
}
|