[I2C] pxa: provide late suspend and early resume hooks

[linux-2.6-omap-h63xx.git] / drivers / i2c / busses / i2c-pxa.c

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 57fbffd1ccc0def139b687621815fcc214fdfe08..518b57c795c819cb41a0bb9b012de3011eb2c50e 100644 (file)
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -909,12 +909,6 @@ static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num
        struct pxa_i2c *i2c = adap->algo_data;
        int ret, i;
 
-       /* If the I2C controller is disabled we need to reset it (probably due
-          to a suspend/resume destroying state). We do this here as we can then
-          avoid worrying about resuming the controller before its users. */
-       if (!(readl(_ICR(i2c)) & ICR_IUE))
-               i2c_pxa_reset(i2c);
-
        for (i = adap->retries; i >= 0; i--) {
                ret = i2c_pxa_do_xfer(i2c, msgs, num);
                if (ret != I2C_RETRY)
@@ -1085,9 +1079,33 @@ static int __exit i2c_pxa_remove(struct platform_device *dev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int i2c_pxa_suspend_late(struct platform_device *dev, pm_message_t state)
+{
+       struct pxa_i2c *i2c = platform_get_drvdata(dev);
+       clk_disable(i2c->clk);
+       return 0;
+}
+
+static int i2c_pxa_resume_early(struct platform_device *dev)
+{
+       struct pxa_i2c *i2c = platform_get_drvdata(dev);
+
+       clk_enable(i2c->clk);
+       i2c_pxa_reset(i2c);
+
+       return 0;
+}
+#else
+#define i2c_pxa_suspend_late NULL
+#define i2c_pxa_resume_early NULL
+#endif
+
 static struct platform_driver i2c_pxa_driver = {
        .probe          = i2c_pxa_probe,
        .remove         = __exit_p(i2c_pxa_remove),
+       .suspend_late   = i2c_pxa_suspend_late,
+       .resume_early   = i2c_pxa_resume_early,
        .driver         = {
                .name   = "pxa2xx-i2c",
                .owner  = THIS_MODULE,