cs4281pm-24.c

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/*******************************************************************************
*
*      "cs4281pm.c" --  Cirrus Logic-Crystal CS4281 linux audio driver.
*
*      Copyright (C) 2000,2001  Cirrus Logic Corp.  
*            -- tom woller ([e-mail]) or
*               ([e-mail]).
*
*      This program is free software; you can redistribute it and/or modify
*      it under the terms of the GNU General Public License as published by
*      the Free Software Foundation; either version 2 of the License, or
*      (at your option) any later version.
*
*      This program is distributed in the hope that it will be useful,
*      but WITHOUT ANY WARRANTY; without even the implied warranty of
*      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*      GNU General Public License for more details.
*
*      You should have received a copy of the GNU General Public License
*      along with this program; if not, write to the Free Software
*      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* 12/22/00 trw - new file. 
*
*******************************************************************************/

#ifndef NOT_CS4281_PM
#include <linux/pm.h>

#define cs_pm_register(a, b, c) pm_register((a), (b), (c));
#define cs_pm_unregister_all(a) pm_unregister_all((a));

static int cs4281_suspend(struct cs4281_state *s);
static int cs4281_resume(struct cs4281_state *s);
/* 
* for now (12/22/00) only enable the pm_register PM support.
* allow these table entries to be null.
#define CS4281_SUSPEND_TBL cs4281_suspend_tbl
#define CS4281_RESUME_TBL cs4281_resume_tbl
*/
#define CS4281_SUSPEND_TBL cs4281_suspend_null
#define CS4281_RESUME_TBL cs4281_resume_null

static int cs4281_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
{
	struct cs4281_state *state;

	CS_DBGOUT(CS_PM, 2, printk(KERN_INFO 
		"cs4281: cs4281_pm_callback dev=%p rqst=0x%x state=%p\n",
			dev,(unsigned)rqst,data));
	state = (struct cs4281_state *) dev->data;
	if (state) {
		switch(rqst) {
			case PM_SUSPEND:
				CS_DBGOUT(CS_PM, 2, printk(KERN_INFO
					"cs4281: PM suspend request\n"));
				if(cs4281_suspend(state))
				{
				    CS_DBGOUT(CS_ERROR, 2, printk(KERN_INFO
					"cs4281: PM suspend request refused\n"));
					return 1; 
				}
				break;
			case PM_RESUME:
				CS_DBGOUT(CS_PM, 2, printk(KERN_INFO
					"cs4281: PM resume request\n"));
				if(cs4281_resume(state))
				{
				    CS_DBGOUT(CS_ERROR, 2, printk(KERN_INFO
					"cs4281: PM resume request refused\n"));
					return 1;
				}
				break;
		}
	}

	return 0;
}

#else /* CS4281_PM */
#define CS4281_SUSPEND_TBL cs4281_suspend_null
#define CS4281_RESUME_TBL cs4281_resume_null
#endif /* CS4281_PM */