sm501: add power control callback

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>
Cc: Arnaud Patard <apatard@mandriva.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 38 insertions, 0 deletions

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index e2530df4d85c..9296b2673b52 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1138,8 +1138,31 @@ static int sm501_plat_probe(struct platform_device *dev)
 }
 
 #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 platform_device *pdev, pm_message_t state)
         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 platform_device *pdev)
 {
         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);
diff --git a/include/linux/sm501.h b/include/linux/sm501.h
index b530fa6a1d34..145405bf9efa 100644
--- a/include/linux/sm501.h
+++ b/include/linux/sm501.h
@@ -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;
 };