[patch 1/4] SM501: add power control callback

Ben Dooks
2008-06-22T21:14:59Z

[-- Attachment #1: simtec/simtec-drivers-mfd-sm501-power-callback.patch --]
[-- Type: text/plain, Size: 2527 bytes --]

Add callback to get or set the power control if
the device has the sleep connected to some form
of GPIO.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

Index: linux-2.6.26-rc4-quilt3/include/linux/sm501.h
===================================================================
--- linux-2.6.26-rc4-quilt3.orig/include/linux/sm501.h 2008-05-29 10:54:40.000000000 +0100
+++ linux-2.6.26-rc4-quilt3/include/linux/sm501.h 2008-05-29 10:54:55.000000000 +0100
@@ -157,6 +157,8 @@ struct sm501_init_gpio {
struct sm501_reg_init gpio_ddr_high;
};

+#define SM501_FLAG_SUSPEND_OFF (1<<4)
+
/* sm501_platdata
*
* This is passed with the platform device to allow the board
@@ -170,6 +172,11 @@ struct sm501_platdata {
struct sm501_init_gpio *init_gpiop;
struct sm501_platdata_fb *fb;

+ int flags;
+
+ int (*get_power)(struct device *dev);
+ int (*set_power)(struct device *dev, unsigned int on);
+
struct sm501_platdata_gpio_i2c *gpio_i2c;
unsigned int gpio_i2c_nr;
};
Index: linux-2.6.26-rc4-quilt3/drivers/mfd/sm501.c
===================================================================
--- linux-2.6.26-rc4-quilt3.orig/drivers/mfd/sm501.c 2008-05-29 10:54:40.000000000 +0100
+++ linux-2.6.26-rc4-quilt3/drivers/mfd/sm501.c 2008-05-29 10:54:55.000000000 +0100
@@ -1138,8 +1138,31 @@ static int sm501_plat_probe(struct platf
}

#ifdef CONFIG_PM
+
/* power management support */

+static void sm501_set_power(struct sm501_devdata *sm, int on)
+{
+ struct sm501_platdata *pd = sm->platdata;
+
+ if (pd == NULL)
+ return;
+
+ if (pd->get_power) {
+ if (pd->get_power(sm->dev) == on) {
+ dev_dbg(sm->dev, "is already %d\n", on);
+ return;
+ }
+ }
+
+ if (pd->set_power) {
+ dev_dbg(sm->dev, "setting power to %d\n", on);
+
+ pd->set_power(sm->dev, on);
+ sm501_mdelay(sm, 10);
+ }
+}
+
static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
{
struct sm501_devdata *sm = platform_get_drvdata(pdev);
@@ -1148,6 +1171,12 @@ static int sm501_plat_suspend(struct pla
sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);

sm501_dump_regs(sm);
+
+ if (sm->platdata) {
+ if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
+ sm501_set_power(sm, 0);
+ }
+
return 0;
}

@@ -1155,6 +1184,8 @@ static int sm501_plat_resume(struct plat
{
struct sm501_devdata *sm = platform_get_drvdata(pdev);

+ sm501_set_power(sm, 1);
+
sm501_dump_regs(sm);
sm501_dump_gate(sm);
sm501_dump_clk(sm);