sony-laptop: add edge modem support (also called WWAN)

Some SZ Vaios have a gsm built-in modem. Allow powering on/off this device.
Thanks to Joshua Wise for the base code.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 56413435c531..141284dee1a1 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -923,6 +923,7 @@ struct sony_pic_dev {
         int                     model;
         u8                      camera_power;
         u8                      bluetooth_power;
+        u8                      wwan_power;
         struct acpi_device      *acpi_dev;
         struct sony_pic_irq     *cur_irq;
         struct sony_pic_ioport  *cur_ioport;
@@ -1330,6 +1331,44 @@ static ssize_t sony_pic_camerapower_show(struct device *dev,
         return count;
 }
 
+/* gprs/edge modem (SZ460N and SZ210P), thanks to Joshua Wise */
+static void sony_pic_set_wwanpower(u8 state)
+{
+        state = !!state;
+        mutex_lock(&spic_dev.lock);
+        if (spic_dev.wwan_power == state) {
+                mutex_unlock(&spic_dev.lock);
+                return;
+        }
+        sony_pic_call2(0xB0, state);
+        spic_dev.wwan_power = state;
+        mutex_unlock(&spic_dev.lock);
+}
+
+static ssize_t sony_pic_wwanpower_store(struct device *dev,
+                struct device_attribute *attr,
+                const char *buffer, size_t count)
+{
+        unsigned long value;
+        if (count > 31)
+                return -EINVAL;
+
+        value = simple_strtoul(buffer, NULL, 10);
+        sony_pic_set_wwanpower(value);
+
+        return count;
+}
+
+static ssize_t sony_pic_wwanpower_show(struct device *dev,
+                struct device_attribute *attr, char *buffer)
+{
+        ssize_t count;
+        mutex_lock(&spic_dev.lock);
+        count = snprintf(buffer, PAGE_SIZE, "%d\n", spic_dev.wwan_power);
+        mutex_unlock(&spic_dev.lock);
+        return count;
+}
+
 /* bluetooth subsystem power state */
 static void __sony_pic_set_bluetoothpower(u8 state)
 {
@@ -1412,11 +1451,13 @@ struct device_attribute spic_attr_##_name = __ATTR(_name,	\
 
 static SPIC_ATTR(camerapower, 0644);
 static SPIC_ATTR(bluetoothpower, 0644);
+static SPIC_ATTR(wwanpower, 0644);
 static SPIC_ATTR(fanspeed, 0644);
 
 static struct attribute *spic_attributes[] = {
         &spic_attr_camerapower.attr,
         &spic_attr_bluetoothpower.attr,
+        &spic_attr_wwanpower.attr,
         &spic_attr_fanspeed.attr,
         NULL
 };