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authorManuel Lauss <mano@roarinelk.homelinux.net>2008-07-15 00:38:33 +0400
committerJean Delvare <khali@mahadeva.delvare>2008-07-15 00:38:33 +0400
commit2373c1801afd06d3a206376902b39a98458c9cfb (patch)
tree1ff3b59acd452891aa00cc0cfcc4015fe2a88378 /drivers/i2c
parent392a0408fdc4c9069c32a9a02b0088eae76c4618 (diff)
downloadlinux-2373c1801afd06d3a206376902b39a98458c9cfb.tar.xz
i2c-ocores: basic PM support
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-ocores.c42
1 files changed, 35 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index 51ca79bf6480..e5193bf75483 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -29,6 +29,7 @@ struct ocores_i2c {
int pos;
int nmsgs;
int state; /* see STATE_ */
+ int clock_khz;
};
/* registers */
@@ -173,8 +174,7 @@ static int ocores_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
return -ETIMEDOUT;
}
-static void ocores_init(struct ocores_i2c *i2c,
- struct ocores_i2c_platform_data *pdata)
+static void ocores_init(struct ocores_i2c *i2c)
{
int prescale;
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 */
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_PREHIGH, prescale >> 8);
@@ -248,7 +248,8 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
}
i2c->regstep = pdata->regstep;
- ocores_init(i2c, pdata);
+ i2c->clock_khz = pdata->clock_khz;
+ ocores_init(i2c);
init_waitqueue_head(&i2c->wait);
ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c);
@@ -312,13 +313,40 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev)
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 */
MODULE_ALIAS("platform:ocores-i2c");
static struct platform_driver ocores_i2c_driver = {
- .probe = ocores_i2c_probe,
- .remove = __devexit_p(ocores_i2c_remove),
- .driver = {
+ .probe = ocores_i2c_probe,
+ .remove = __devexit_p(ocores_i2c_remove),
+ .suspend = ocores_i2c_suspend,
+ .resume = ocores_i2c_resume,
+ .driver = {
.owner = THIS_MODULE,
.name = "ocores-i2c",
},