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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-27 14:45:55 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2009-09-17 09:46:58 +0200
commit63aed85e3535b4603798184cc941e49de386d354 (patch)
tree9fadb2c68ec7702327b725043c2e214e0263a154
parent7e9f9fd4b8285c52c0950a1929864346de5caa6d (diff)
downloadblackbird-op-linux-63aed85e3535b4603798184cc941e49de386d354.tar.gz
blackbird-op-linux-63aed85e3535b4603798184cc941e49de386d354.zip
mfd: Conditionally add WM831x backlight subdevice
The WM831x backlight driver requires at least the specification of the current sink to use and a maximum current to allow them to function and will actively interfere with other users of the regulators it uses if misconfigured so only register the subdevice for it if this platform data has been supplied. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/mfd/wm831x-core.c15
-rw-r--r--include/linux/mfd/wm831x/pdata.h6
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 42bef1dd2ca1..bc40ea315cc0 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -1172,6 +1172,12 @@ static struct mfd_cell wm8312_devs[] = {
},
};
+static struct mfd_cell backlight_devs[] = {
+ {
+ .name = "wm831x-backlight",
+ },
+};
+
/*
* Instantiate the generic non-control parts of the device.
*/
@@ -1325,6 +1331,15 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
goto err_irq;
}
+ if (pdata && pdata->backlight) {
+ /* Treat errors as non-critical */
+ ret = mfd_add_devices(wm831x->dev, -1, backlight_devs,
+ ARRAY_SIZE(backlight_devs), NULL, 0);
+ if (ret < 0)
+ dev_err(wm831x->dev, "Failed to add backlight: %d\n",
+ ret);
+ }
+
if (pdata && pdata->post_init) {
ret = pdata->post_init(wm831x);
if (ret != 0) {
diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index 571e60136264..90d820260aad 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -18,6 +18,11 @@
struct wm831x;
struct regulator_init_data;
+struct wm831x_backlight_pdata {
+ int isink; /** ISINK to use, 1 or 2 */
+ int max_uA; /** Maximum current to allow */
+};
+
struct wm831x_backup_pdata {
int charger_enable;
int no_constant_voltage; /** Disable constant voltage charging */
@@ -87,6 +92,7 @@ struct wm831x_pdata {
int (*post_init)(struct wm831x *wm831x);
int gpio_base;
+ struct wm831x_backlight_pdata *backlight;
struct wm831x_backup_pdata *backup;
struct wm831x_battery_pdata *battery;
struct wm831x_touch_pdata *touch;
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