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| author | Manuel Lauss <mano@roarinelk.homelinux.net> | 2008-07-14 22:38:33 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@mahadeva.delvare> | 2008-07-14 22:38:33 +0200 |
| commit | 2373c1801afd06d3a206376902b39a98458c9cfb (patch) | |
| tree | 1ff3b59acd452891aa00cc0cfcc4015fe2a88378 /drivers/i2c | |
| parent | 392a0408fdc4c9069c32a9a02b0088eae76c4618 (diff) | |
| download | lwn-2373c1801afd06d3a206376902b39a98458c9cfb.tar.gz lwn-2373c1801afd06d3a206376902b39a98458c9cfb.zip | |
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.c | 42 |
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", }, |