@@ -497,6 +497,8 @@ void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream);
int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
unsigned int dai_fmt);
+int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour);
+
/* Utility functions to get clock rates from various things */
int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params);
@@ -1094,6 +1096,8 @@ struct snd_soc_card {
const char *name;
const char *long_name;
const char *driver_name;
+ char dmi_longname[80];
+
struct device *dev;
struct snd_card *snd_card;
struct module *owner;
@@ -34,6 +34,7 @@
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/dmi.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
@@ -1886,6 +1887,139 @@ int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);
+
+/* Trim special characters, and replace '-' with '_' since '-' is used to
+ * separate different DMI fields in the card long name. Only number and
+ * alphabet characters and a few separator characters are kept.
+ */
+static void cleanup_dmi_name(char *name)
+{
+ int i, j = 0;
+
+ for (i = 0; name[i]; i++) {
+ if (isalnum(name[i]) || (name[i] == '.')
+ || (name[i] == '_'))
+ name[j++] = name[i];
+ else if (name[i] == '-')
+ name[j++] = '_';
+ }
+
+ name[j] = '\0';
+}
+
+/**
+ * snd_soc_set_dmi_name() - Register DMI names to card
+ * @card: The card to register DMI names
+ * @flavour: The flavour "differentiator" for the card amongst its peers.
+ *
+ * An Intel machine driver may be used by many different devices but are
+ * difficult for userspace to differentiate, since machine drivers ususally
+ * use their own name as the card short name and leave the card long name
+ * blank. To differentiate such devices and fix bugs due to lack of
+ * device-specific configurations, this function allows DMI info to be used
+ * as the sound card long name, in the format of
+ * "vendor-product-version-board"
+ * (Character '-' is used to separate different DMI fields here).
+ * This will help the user space to load the device-specific Use Case Manager
+ * (UCM) configurations for the card.
+ *
+ * Possible card long names may be:
+ * DellInc.-XPS139343-01-0310JH
+ * ASUSTeKCOMPUTERINC.-T100TA-1.0-T100TA
+ * Circuitco-MinnowboardMaxD0PLATFORM-D0-MinnowBoardMAX
+ *
+ * This function also supports flavoring the card longname to provide
+ * the extra differentiation, like "vendor-product-version-board-flavor".
+ *
+ * We only keep number and alphabet characters and a few separator characters
+ * in the card long name since UCM in the user space uses the card long names
+ * as card configuration directory names and AudoConf cannot support special
+ * charactors like SPACE.
+ *
+ * Returns 0 on success, otherwise a negative error code.
+ */
+int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour)
+{
+ const char *vendor, *product, *product_version, *board;
+ size_t longname_buf_size = sizeof(card->snd_card->longname);
+ size_t len;
+
+ if (card->long_name)
+ return 0; /* long name already set by driver or from DMI */
+
+ /* make up dmi long name as: vendor.product.version.board */
+ vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
+ if (!vendor) {
+ dev_warn(card->dev, "ASoC: no DMI vendor name!\n");
+ return 0;
+ }
+
+ snprintf(card->dmi_longname, sizeof(card->snd_card->longname),
+ "%s", vendor);
+ cleanup_dmi_name(card->dmi_longname);
+
+ product = dmi_get_system_info(DMI_PRODUCT_NAME);
+ if (product) {
+ len = strlen(card->dmi_longname);
+ snprintf(card->dmi_longname + len,
+ longname_buf_size - len,
+ "-%s", product);
+
+ len++; /* skip the separator "-" */
+ if (len < longname_buf_size)
+ cleanup_dmi_name(card->dmi_longname + len);
+
+ /* some vendors like Lenovo may only put a self-explanatory
+ * name in the product version field
+ */
+ product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
+ if (product_version) {
+ len = strlen(card->dmi_longname);
+ snprintf(card->dmi_longname + len,
+ longname_buf_size - len,
+ "-%s", product_version);
+
+ len++;
+ if (len < longname_buf_size)
+ cleanup_dmi_name(card->dmi_longname + len);
+ }
+ }
+
+ board = dmi_get_system_info(DMI_BOARD_NAME);
+ if (board) {
+ len = strlen(card->dmi_longname);
+ snprintf(card->dmi_longname + len,
+ longname_buf_size - len,
+ "-%s", board);
+
+ len++;
+ if (len < longname_buf_size)
+ cleanup_dmi_name(card->dmi_longname + len);
+ } else if (!product) {
+ /* fall back to using legacy name */
+ dev_warn(card->dev, "ASoC: no DMI board/product name!\n");
+ return 0;
+ }
+
+ /* Add flavour to dmi long name */
+ if (flavour) {
+ len = strlen(card->dmi_longname);
+ snprintf(card->dmi_longname + len,
+ longname_buf_size - len,
+ "-%s", flavour);
+
+ len++;
+ if (len < longname_buf_size)
+ cleanup_dmi_name(card->dmi_longname + len);
+ }
+
+ /* set the card long name */
+ card->long_name = card->dmi_longname;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_dmi_name);
+
static int snd_soc_instantiate_card(struct snd_soc_card *card)
{
struct snd_soc_codec *codec;