[PATCH 6/9] add write support to mute

[Kenneth Chan]

Add write support to the mute platform device


Signed-off-by: Kenneth Chan <kenneth.t.c...@gmail.com>
---
 drivers/platform/x86/panasonic-laptop.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/panasonic-laptop.c 
b/drivers/platform/x86/panasonic-laptop.c
index c77292588a8a..3b0294ee9d3e 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -13,6 +13,7 @@
  *
  * ChangeLog:
  *     Aug.18, 2020    Kenneth Chan <kenneth.t.c...@gmail.com>
+ *                     add write support to mute
  *                     fix sticky_key init bug
  *                     fix naming of platform files for consistency with other
  *                     modules
@@ -220,6 +221,7 @@ struct pcc_acpi {
        acpi_handle             handle;
        unsigned long           num_sifr;
        int                     sticky_key;
+       int                     mute;
        u32                     *sinf;
        struct acpi_device      *device;
        struct input_dev        *input_dev;
@@ -483,6 +485,24 @@ static ssize_t mute_show(struct device *dev, struct 
device_attribute *attr,
        return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
 }
 
+static ssize_t mute_store(struct device *dev, struct device_attribute *attr,
+                         const char *buf, size_t count)
+{
+       struct acpi_device *acpi = to_acpi_device(dev);
+       struct pcc_acpi *pcc = acpi_driver_data(acpi);
+       int err, val;
+
+       err = kstrtoint(buf, 0, &val);
+       if (err)
+               return err;
+       if (val == 0 || val == 1) {
+               acpi_pcc_write_sset(pcc, SINF_MUTE, val);
+               pcc->mute = val;
+       }
+
+       return count;
+}
+
 static ssize_t sticky_key_show(struct device *dev, struct device_attribute 
*attr,
                           char *buf)
 {
@@ -533,7 +553,7 @@ static ssize_t cdpower_store(struct device *dev, struct 
device_attribute *attr,
 
 static DEVICE_ATTR_RO(numbatt);
 static DEVICE_ATTR_RO(lcdtype);
-static DEVICE_ATTR_RO(mute);
+static DEVICE_ATTR_RW(mute);
 static DEVICE_ATTR_RW(sticky_key);
 static DEVICE_ATTR_RW(cdpower);
 
@@ -690,6 +710,7 @@ static int acpi_pcc_hotkey_resume(struct device *dev)
        if (!pcc)
                return -EINVAL;
 
+       acpi_pcc_write_sset(pcc, SINF_MUTE, pcc->mute);
        acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_key);
 
        return 0;
@@ -760,6 +781,8 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
        acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, 0);
        pcc->sticky_key = 0;
 
+       pcc->mute = pcc->sinf[SINF_MUTE];
+
        /* add sysfs attributes */
        result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
        if (result)
-- 
2.17.5