mirror of https://gitee.com/openkylin/linux.git
173 lines
3.9 KiB
C
173 lines
3.9 KiB
C
/*
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*
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* $Id$
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*
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* Copyright (C) 2005 Mike Isely <isely@pobox.com>
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* Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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This source file is specifically designed to interface with the
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wm8775.
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*/
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#include "pvrusb2-wm8775.h"
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#include "pvrusb2-i2c-cmd-v4l2.h"
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#include "pvrusb2-hdw-internal.h"
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#include "pvrusb2-debug.h"
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#include <linux/videodev2.h>
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#include <media/v4l2-common.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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struct pvr2_v4l_wm8775 {
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struct pvr2_i2c_handler handler;
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struct pvr2_i2c_client *client;
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struct pvr2_hdw *hdw;
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unsigned long stale_mask;
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};
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static void set_input(struct pvr2_v4l_wm8775 *ctxt)
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{
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struct v4l2_routing route;
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struct pvr2_hdw *hdw = ctxt->hdw;
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memset(&route,0,sizeof(route));
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switch(hdw->input_val) {
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case PVR2_CVAL_INPUT_RADIO:
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route.input = 1;
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break;
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default:
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/* All other cases just use the second input */
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route.input = 2;
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break;
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}
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pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d route=0x%x)",
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hdw->input_val,route.input);
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pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
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}
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static int check_input(struct pvr2_v4l_wm8775 *ctxt)
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{
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struct pvr2_hdw *hdw = ctxt->hdw;
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return hdw->input_dirty != 0;
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}
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struct pvr2_v4l_wm8775_ops {
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void (*update)(struct pvr2_v4l_wm8775 *);
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int (*check)(struct pvr2_v4l_wm8775 *);
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};
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static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
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{ .update = set_input, .check = check_input},
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};
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static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
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char *buf,unsigned int cnt)
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{
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return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
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}
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static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
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{
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ctxt->client->handler = NULL;
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kfree(ctxt);
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}
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static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
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{
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unsigned long msk;
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unsigned int idx;
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for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
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msk = 1 << idx;
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if (ctxt->stale_mask & msk) continue;
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if (wm8775_ops[idx].check(ctxt)) {
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ctxt->stale_mask |= msk;
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}
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}
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return ctxt->stale_mask != 0;
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}
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static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
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{
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unsigned long msk;
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unsigned int idx;
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for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
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msk = 1 << idx;
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if (!(ctxt->stale_mask & msk)) continue;
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ctxt->stale_mask &= ~msk;
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wm8775_ops[idx].update(ctxt);
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}
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}
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static const struct pvr2_i2c_handler_functions hfuncs = {
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.detach = (void (*)(void *))wm8775_detach,
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.check = (int (*)(void *))wm8775_check,
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.update = (void (*)(void *))wm8775_update,
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.describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
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};
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int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
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{
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struct pvr2_v4l_wm8775 *ctxt;
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if (cp->handler) return 0;
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ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
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if (!ctxt) return 0;
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ctxt->handler.func_data = ctxt;
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ctxt->handler.func_table = &hfuncs;
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ctxt->client = cp;
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ctxt->hdw = hdw;
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ctxt->stale_mask = (1 << ARRAY_SIZE(wm8775_ops)) - 1;
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cp->handler = &ctxt->handler;
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pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
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cp->client->addr);
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return !0;
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}
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/*
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Stuff for Emacs to see, in order to encourage consistent editing style:
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*** Local Variables: ***
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*** mode: c ***
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*** fill-column: 70 ***
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*** tab-width: 8 ***
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*** c-basic-offset: 8 ***
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*** End: ***
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*/
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