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path: root/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
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Diffstat (limited to 'drivers/media/usb/pvrusb2/pvrusb2-ctrl.c')
-rw-r--r--drivers/media/usb/pvrusb2/pvrusb2-ctrl.c563
1 files changed, 563 insertions, 0 deletions
diff --git a/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c b/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
new file mode 100644
index 0000000000..8ae3ad80cc
--- /dev/null
+++ b/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
@@ -0,0 +1,563 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Copyright (C) 2005 Mike Isely <isely@pobox.com>
+ */
+
+#include "pvrusb2-ctrl.h"
+#include "pvrusb2-hdw-internal.h"
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+
+
+static int pvr2_ctrl_range_check(struct pvr2_ctrl *cptr,int val)
+{
+ if (cptr->info->check_value) {
+ if (!cptr->info->check_value(cptr,val)) return -ERANGE;
+ } else if (cptr->info->type == pvr2_ctl_enum) {
+ if (val < 0) return -ERANGE;
+ if (val >= cptr->info->def.type_enum.count) return -ERANGE;
+ } else {
+ int lim;
+ lim = cptr->info->def.type_int.min_value;
+ if (cptr->info->get_min_value) {
+ cptr->info->get_min_value(cptr,&lim);
+ }
+ if (val < lim) return -ERANGE;
+ lim = cptr->info->def.type_int.max_value;
+ if (cptr->info->get_max_value) {
+ cptr->info->get_max_value(cptr,&lim);
+ }
+ if (val > lim) return -ERANGE;
+ }
+ return 0;
+}
+
+
+/* Set the given control. */
+int pvr2_ctrl_set_value(struct pvr2_ctrl *cptr,int val)
+{
+ return pvr2_ctrl_set_mask_value(cptr,~0,val);
+}
+
+
+/* Set/clear specific bits of the given control. */
+int pvr2_ctrl_set_mask_value(struct pvr2_ctrl *cptr,int mask,int val)
+{
+ int ret = 0;
+ if (!cptr) return -EINVAL;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->set_value) {
+ if (cptr->info->type == pvr2_ctl_bitmask) {
+ mask &= cptr->info->def.type_bitmask.valid_bits;
+ } else if ((cptr->info->type == pvr2_ctl_int)||
+ (cptr->info->type == pvr2_ctl_enum)) {
+ ret = pvr2_ctrl_range_check(cptr,val);
+ if (ret < 0) break;
+ } else if (cptr->info->type != pvr2_ctl_bool) {
+ break;
+ }
+ ret = cptr->info->set_value(cptr,mask,val);
+ } else {
+ ret = -EPERM;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Get the current value of the given control. */
+int pvr2_ctrl_get_value(struct pvr2_ctrl *cptr,int *valptr)
+{
+ int ret = 0;
+ if (!cptr) return -EINVAL;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ ret = cptr->info->get_value(cptr,valptr);
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve control's type */
+enum pvr2_ctl_type pvr2_ctrl_get_type(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return pvr2_ctl_int;
+ return cptr->info->type;
+}
+
+
+/* Retrieve control's maximum value (int type) */
+int pvr2_ctrl_get_max(struct pvr2_ctrl *cptr)
+{
+ int ret = 0;
+ if (!cptr) return 0;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->get_max_value) {
+ cptr->info->get_max_value(cptr,&ret);
+ } else if (cptr->info->type == pvr2_ctl_int) {
+ ret = cptr->info->def.type_int.max_value;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve control's minimum value (int type) */
+int pvr2_ctrl_get_min(struct pvr2_ctrl *cptr)
+{
+ int ret = 0;
+ if (!cptr) return 0;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->get_min_value) {
+ cptr->info->get_min_value(cptr,&ret);
+ } else if (cptr->info->type == pvr2_ctl_int) {
+ ret = cptr->info->def.type_int.min_value;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve control's default value (any type) */
+int pvr2_ctrl_get_def(struct pvr2_ctrl *cptr, int *valptr)
+{
+ int ret = 0;
+ if (!cptr) return -EINVAL;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->get_def_value) {
+ ret = cptr->info->get_def_value(cptr, valptr);
+ } else {
+ *valptr = cptr->info->default_value;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve control's enumeration count (enum only) */
+int pvr2_ctrl_get_cnt(struct pvr2_ctrl *cptr)
+{
+ int ret = 0;
+ if (!cptr) return 0;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->type == pvr2_ctl_enum) {
+ ret = cptr->info->def.type_enum.count;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve control's valid mask bits (bit mask only) */
+int pvr2_ctrl_get_mask(struct pvr2_ctrl *cptr)
+{
+ int ret = 0;
+ if (!cptr) return 0;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->type == pvr2_ctl_bitmask) {
+ ret = cptr->info->def.type_bitmask.valid_bits;
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Retrieve the control's name */
+const char *pvr2_ctrl_get_name(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return NULL;
+ return cptr->info->name;
+}
+
+
+/* Retrieve the control's desc */
+const char *pvr2_ctrl_get_desc(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return NULL;
+ return cptr->info->desc;
+}
+
+
+/* Retrieve a control enumeration or bit mask value */
+int pvr2_ctrl_get_valname(struct pvr2_ctrl *cptr,int val,
+ char *bptr,unsigned int bmax,
+ unsigned int *blen)
+{
+ int ret = -EINVAL;
+ if (!cptr) return 0;
+ *blen = 0;
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->type == pvr2_ctl_enum) {
+ const char * const *names;
+ names = cptr->info->def.type_enum.value_names;
+ if (pvr2_ctrl_range_check(cptr,val) == 0) {
+ if (names[val]) {
+ *blen = scnprintf(
+ bptr,bmax,"%s",
+ names[val]);
+ } else {
+ *blen = 0;
+ }
+ ret = 0;
+ }
+ } else if (cptr->info->type == pvr2_ctl_bitmask) {
+ const char **names;
+ unsigned int idx;
+ int msk;
+ names = cptr->info->def.type_bitmask.bit_names;
+ val &= cptr->info->def.type_bitmask.valid_bits;
+ for (idx = 0, msk = 1; val; idx++, msk <<= 1) {
+ if (val & msk) {
+ *blen = scnprintf(bptr,bmax,"%s",
+ names[idx]);
+ ret = 0;
+ break;
+ }
+ }
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Return V4L ID for this control or zero if none */
+int pvr2_ctrl_get_v4lid(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return 0;
+ return cptr->info->v4l_id;
+}
+
+
+unsigned int pvr2_ctrl_get_v4lflags(struct pvr2_ctrl *cptr)
+{
+ unsigned int flags = 0;
+
+ if (cptr->info->get_v4lflags) {
+ flags = cptr->info->get_v4lflags(cptr);
+ }
+
+ if (cptr->info->set_value) {
+ flags &= ~V4L2_CTRL_FLAG_READ_ONLY;
+ } else {
+ flags |= V4L2_CTRL_FLAG_READ_ONLY;
+ }
+
+ return flags;
+}
+
+
+/* Return true if control is writable */
+int pvr2_ctrl_is_writable(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return 0;
+ return cptr->info->set_value != NULL;
+}
+
+
+/* Return true if control has custom symbolic representation */
+int pvr2_ctrl_has_custom_symbols(struct pvr2_ctrl *cptr)
+{
+ if (!cptr) return 0;
+ if (!cptr->info->val_to_sym) return 0;
+ if (!cptr->info->sym_to_val) return 0;
+ return !0;
+}
+
+
+/* Convert a given mask/val to a custom symbolic value */
+int pvr2_ctrl_custom_value_to_sym(struct pvr2_ctrl *cptr,
+ int mask,int val,
+ char *buf,unsigned int maxlen,
+ unsigned int *len)
+{
+ if (!cptr) return -EINVAL;
+ if (!cptr->info->val_to_sym) return -EINVAL;
+ return cptr->info->val_to_sym(cptr,mask,val,buf,maxlen,len);
+}
+
+
+/* Convert a symbolic value to a mask/value pair */
+int pvr2_ctrl_custom_sym_to_value(struct pvr2_ctrl *cptr,
+ const char *buf,unsigned int len,
+ int *maskptr,int *valptr)
+{
+ if (!cptr) return -EINVAL;
+ if (!cptr->info->sym_to_val) return -EINVAL;
+ return cptr->info->sym_to_val(cptr,buf,len,maskptr,valptr);
+}
+
+
+static unsigned int gen_bitmask_string(int msk,int val,int msk_only,
+ const char **names,
+ char *ptr,unsigned int len)
+{
+ unsigned int idx;
+ long sm,um;
+ int spcFl;
+ unsigned int uc,cnt;
+ const char *idStr;
+
+ spcFl = 0;
+ uc = 0;
+ um = 0;
+ for (idx = 0, sm = 1; msk; idx++, sm <<= 1) {
+ if (sm & msk) {
+ msk &= ~sm;
+ idStr = names[idx];
+ if (idStr) {
+ cnt = scnprintf(ptr,len,"%s%s%s",
+ (spcFl ? " " : ""),
+ (msk_only ? "" :
+ ((val & sm) ? "+" : "-")),
+ idStr);
+ ptr += cnt; len -= cnt; uc += cnt;
+ spcFl = !0;
+ } else {
+ um |= sm;
+ }
+ }
+ }
+ if (um) {
+ if (msk_only) {
+ cnt = scnprintf(ptr,len,"%s0x%lx",
+ (spcFl ? " " : ""),
+ um);
+ ptr += cnt; len -= cnt; uc += cnt;
+ spcFl = !0;
+ } else if (um & val) {
+ cnt = scnprintf(ptr,len,"%s+0x%lx",
+ (spcFl ? " " : ""),
+ um & val);
+ ptr += cnt; len -= cnt; uc += cnt;
+ spcFl = !0;
+ } else if (um & ~val) {
+ cnt = scnprintf(ptr,len,"%s+0x%lx",
+ (spcFl ? " " : ""),
+ um & ~val);
+ ptr += cnt; len -= cnt; uc += cnt;
+ spcFl = !0;
+ }
+ }
+ return uc;
+}
+
+
+static const char *boolNames[] = {
+ "false",
+ "true",
+ "no",
+ "yes",
+};
+
+
+static int parse_token(const char *ptr,unsigned int len,
+ int *valptr,
+ const char * const *names, unsigned int namecnt)
+{
+ unsigned int slen;
+ unsigned int idx;
+ *valptr = 0;
+ if (!names) namecnt = 0;
+ for (idx = 0; idx < namecnt; idx++) {
+ if (!names[idx]) continue;
+ slen = strlen(names[idx]);
+ if (slen != len) continue;
+ if (memcmp(names[idx],ptr,slen)) continue;
+ *valptr = idx;
+ return 0;
+ }
+ return kstrtoint(ptr, 0, valptr) ? -EINVAL : 1;
+}
+
+
+static int parse_mtoken(const char *ptr,unsigned int len,
+ int *valptr,
+ const char **names,int valid_bits)
+{
+ unsigned int slen;
+ unsigned int idx;
+ int msk;
+ *valptr = 0;
+ for (idx = 0, msk = 1; valid_bits; idx++, msk <<= 1) {
+ if (!(msk & valid_bits)) continue;
+ valid_bits &= ~msk;
+ if (!names[idx]) continue;
+ slen = strlen(names[idx]);
+ if (slen != len) continue;
+ if (memcmp(names[idx],ptr,slen)) continue;
+ *valptr = msk;
+ return 0;
+ }
+ return kstrtoint(ptr, 0, valptr);
+}
+
+
+static int parse_tlist(const char *ptr,unsigned int len,
+ int *maskptr,int *valptr,
+ const char **names,int valid_bits)
+{
+ unsigned int cnt;
+ int mask,val,kv,mode,ret;
+ mask = 0;
+ val = 0;
+ ret = 0;
+ while (len) {
+ cnt = 0;
+ while ((cnt < len) &&
+ ((ptr[cnt] <= 32) ||
+ (ptr[cnt] >= 127))) cnt++;
+ ptr += cnt;
+ len -= cnt;
+ mode = 0;
+ if ((*ptr == '-') || (*ptr == '+')) {
+ mode = (*ptr == '-') ? -1 : 1;
+ ptr++;
+ len--;
+ }
+ cnt = 0;
+ while (cnt < len) {
+ if (ptr[cnt] <= 32) break;
+ if (ptr[cnt] >= 127) break;
+ cnt++;
+ }
+ if (!cnt) break;
+ if (parse_mtoken(ptr,cnt,&kv,names,valid_bits)) {
+ ret = -EINVAL;
+ break;
+ }
+ ptr += cnt;
+ len -= cnt;
+ switch (mode) {
+ case 0:
+ mask = valid_bits;
+ val |= kv;
+ break;
+ case -1:
+ mask |= kv;
+ val &= ~kv;
+ break;
+ case 1:
+ mask |= kv;
+ val |= kv;
+ break;
+ default:
+ break;
+ }
+ }
+ *maskptr = mask;
+ *valptr = val;
+ return ret;
+}
+
+
+/* Convert a symbolic value to a mask/value pair */
+int pvr2_ctrl_sym_to_value(struct pvr2_ctrl *cptr,
+ const char *ptr,unsigned int len,
+ int *maskptr,int *valptr)
+{
+ int ret = -EINVAL;
+ unsigned int cnt;
+
+ *maskptr = 0;
+ *valptr = 0;
+
+ cnt = 0;
+ while ((cnt < len) && ((ptr[cnt] <= 32) || (ptr[cnt] >= 127))) cnt++;
+ len -= cnt; ptr += cnt;
+ cnt = 0;
+ while ((cnt < len) && ((ptr[len-(cnt+1)] <= 32) ||
+ (ptr[len-(cnt+1)] >= 127))) cnt++;
+ len -= cnt;
+
+ if (!len) return -EINVAL;
+
+ LOCK_TAKE(cptr->hdw->big_lock); do {
+ if (cptr->info->type == pvr2_ctl_int) {
+ ret = parse_token(ptr,len,valptr,NULL,0);
+ if (ret >= 0) {
+ ret = pvr2_ctrl_range_check(cptr,*valptr);
+ }
+ *maskptr = ~0;
+ } else if (cptr->info->type == pvr2_ctl_bool) {
+ ret = parse_token(ptr,len,valptr,boolNames,
+ ARRAY_SIZE(boolNames));
+ if (ret == 1) {
+ *valptr = *valptr ? !0 : 0;
+ } else if (ret == 0) {
+ *valptr = (*valptr & 1) ? !0 : 0;
+ }
+ *maskptr = 1;
+ } else if (cptr->info->type == pvr2_ctl_enum) {
+ ret = parse_token(
+ ptr,len,valptr,
+ cptr->info->def.type_enum.value_names,
+ cptr->info->def.type_enum.count);
+ if (ret >= 0) {
+ ret = pvr2_ctrl_range_check(cptr,*valptr);
+ }
+ *maskptr = ~0;
+ } else if (cptr->info->type == pvr2_ctl_bitmask) {
+ ret = parse_tlist(
+ ptr,len,maskptr,valptr,
+ cptr->info->def.type_bitmask.bit_names,
+ cptr->info->def.type_bitmask.valid_bits);
+ }
+ } while(0); LOCK_GIVE(cptr->hdw->big_lock);
+ return ret;
+}
+
+
+/* Convert a given mask/val to a symbolic value */
+int pvr2_ctrl_value_to_sym_internal(struct pvr2_ctrl *cptr,
+ int mask,int val,
+ char *buf,unsigned int maxlen,
+ unsigned int *len)
+{
+ int ret = -EINVAL;
+
+ *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;
+}
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