msm_fb: HDMI: Enable SPD InfoFrame transmission
Sinks use the information in the SPD InfoFrame to get
the vendor name and the product information of the source
device. This change adds the ability to specify this
information and transmit the data as part of the SPD
InfoFrame.
Change-Id: Iff3db2e21cc30cdcc18787de5fd83c6a0790794e
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
diff --git a/drivers/video/msm/external_common.c b/drivers/video/msm/external_common.c
index 061e69c..29d500a 100644
--- a/drivers/video/msm/external_common.c
+++ b/drivers/video/msm/external_common.c
@@ -343,6 +343,86 @@
return ret;
}
+static ssize_t hdmi_common_wta_vendor_name(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ uint8 *s = (uint8 *) buf;
+ uint8 *d = external_common_state->spd_vendor_name;
+ ssize_t ret = strnlen(buf, PAGE_SIZE);
+ ret = (ret > 8) ? 8 : ret;
+
+ memset(external_common_state->spd_vendor_name, 0, 8);
+ while (*s) {
+ if (*s & 0x60 && *s ^ 0x7f) {
+ *d = *s;
+ } else {
+ /* stop copying if control character found */
+ break;
+ }
+
+ if (++s > (uint8 *) (buf + ret))
+ break;
+
+ d++;
+ }
+
+ DEV_DBG("%s: '%s'\n", __func__,
+ external_common_state->spd_vendor_name);
+
+ return ret;
+}
+
+static ssize_t hdmi_common_rda_vendor_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ ssize_t ret = snprintf(buf, PAGE_SIZE, "%s\n",
+ external_common_state->spd_vendor_name);
+ DEV_DBG("%s: '%s'\n", __func__,
+ external_common_state->spd_vendor_name);
+
+ return ret;
+}
+
+static ssize_t hdmi_common_wta_product_description(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ uint8 *s = (uint8 *) buf;
+ uint8 *d = external_common_state->spd_product_description;
+ ssize_t ret = strnlen(buf, PAGE_SIZE);
+ ret = (ret > 16) ? 16 : ret;
+
+ memset(external_common_state->spd_product_description, 0, 16);
+ while (*s) {
+ if (*s & 0x60 && *s ^ 0x7f) {
+ *d = *s;
+ } else {
+ /* stop copying if control character found */
+ break;
+ }
+
+ if (++s > (uint8 *) (buf + ret))
+ break;
+
+ d++;
+ }
+
+ DEV_DBG("%s: '%s'\n", __func__,
+ external_common_state->spd_product_description);
+
+ return ret;
+}
+
+static ssize_t hdmi_common_rda_product_description(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ ssize_t ret = snprintf(buf, PAGE_SIZE, "%s\n",
+ external_common_state->spd_product_description);
+ DEV_DBG("%s: '%s'\n", __func__,
+ external_common_state->spd_product_description);
+
+ return ret;
+}
+
static ssize_t hdmi_common_rda_hdcp(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -711,6 +791,11 @@
hdmi_common_rda_edid_physical_address, NULL);
static DEVICE_ATTR(scan_info, S_IRUGO,
hdmi_common_rda_edid_scan_info, NULL);
+static DEVICE_ATTR(vendor_name, S_IRUGO | S_IWUSR, hdmi_common_rda_vendor_name,
+ hdmi_common_wta_vendor_name);
+static DEVICE_ATTR(product_description, S_IRUGO | S_IWUSR,
+ hdmi_common_rda_product_description,
+ hdmi_common_wta_product_description);
static DEVICE_ATTR(3d_present, S_IRUGO, hdmi_common_rda_3d_present, NULL);
static DEVICE_ATTR(hdcp_present, S_IRUGO, hdmi_common_rda_hdcp_present, NULL);
#endif
@@ -731,6 +816,8 @@
&dev_attr_hpd.attr,
&dev_attr_pa.attr,
&dev_attr_scan_info.attr,
+ &dev_attr_vendor_name.attr,
+ &dev_attr_product_description.attr,
&dev_attr_3d_present.attr,
&dev_attr_hdcp_present.attr,
#endif