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i2c-ocores: basic PM support

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Basic PM support: reinit the core on resume, disable it on suspend.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Manuel Lauss 2008-07-14 22:38:33 +02:00 committed by Jean Delvare
parent 392a0408fd
commit 2373c1801a
1 changed files with 35 additions and 7 deletions
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36
drivers/i2c/busses/i2c-ocores.c
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@ -29,6 +29,7 @@ struct ocores_i2c {
int pos; int pos;
int nmsgs; int nmsgs;
int state; /* see STATE_ */ int state; /* see STATE_ */
int clock_khz;
}; };
/* registers */ /* registers */
@ -173,8 +174,7 @@ static int ocores_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
return -ETIMEDOUT; return -ETIMEDOUT;
} }
static void ocores_init(struct ocores_i2c *i2c, static void ocores_init(struct ocores_i2c *i2c)
struct ocores_i2c_platform_data *pdata)
{ {
int prescale; int prescale;
u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL);
@ -182,7 +182,7 @@ static void ocores_init(struct ocores_i2c *i2c,
/* make sure the device is disabled */ /* make sure the device is disabled */
oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN));
prescale = (pdata->clock_khz / (5*100)) - 1; prescale = (i2c->clock_khz / (5*100)) - 1;
oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff); oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff);
oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8); oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8);
@ -248,7 +248,8 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
} }
i2c->regstep = pdata->regstep; i2c->regstep = pdata->regstep;
ocores_init(i2c, pdata); i2c->clock_khz = pdata->clock_khz;
ocores_init(i2c);
init_waitqueue_head(&i2c->wait); init_waitqueue_head(&i2c->wait);
ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c); ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c);
@ -312,12 +313,39 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev)
return 0; return 0;
} }
#ifdef CONFIG_PM
static int ocores_i2c_suspend(struct platform_device *pdev, pm_message_t state)
{
struct ocores_i2c *i2c = platform_get_drvdata(pdev);
u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL);
/* make sure the device is disabled */
oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN));
return 0;
}
static int ocores_i2c_resume(struct platform_device *pdev)
{
struct ocores_i2c *i2c = platform_get_drvdata(pdev);
ocores_init(i2c);
return 0;
}
#else
#define ocores_i2c_suspend NULL
#define ocores_i2c_resume NULL
#endif
/* work with hotplug and coldplug */ /* work with hotplug and coldplug */
MODULE_ALIAS("platform:ocores-i2c"); MODULE_ALIAS("platform:ocores-i2c");
static struct platform_driver ocores_i2c_driver = { static struct platform_driver ocores_i2c_driver = {
.probe = ocores_i2c_probe, .probe = ocores_i2c_probe,
.remove = __devexit_p(ocores_i2c_remove), .remove = __devexit_p(ocores_i2c_remove),
.suspend = ocores_i2c_suspend,
.resume = ocores_i2c_resume,
.driver = { .driver = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.name = "ocores-i2c", .name = "ocores-i2c",