soundwire: master: add sysfs support
Add the master properties as attributes. The description is directly
derived from the MIPI DisCo specification.
Credits: this patch is based on an earlier internal contribution by
Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200518203551.2053-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c
index 5411791..5f0b218 100644
--- a/drivers/soundwire/master.c
+++ b/drivers/soundwire/master.c
@@ -8,6 +8,89 @@
#include <linux/soundwire/sdw_type.h>
#include "bus.h"
+/*
+ * The sysfs for properties reflects the MIPI description as given
+ * in the MIPI DisCo spec
+ *
+ * Base file is:
+ * sdw-master-N
+ * |---- revision
+ * |---- clk_stop_modes
+ * |---- max_clk_freq
+ * |---- clk_freq
+ * |---- clk_gears
+ * |---- default_row
+ * |---- default_col
+ * |---- dynamic_shape
+ * |---- err_threshold
+ */
+
+#define sdw_master_attr(field, format_string) \
+static ssize_t field##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct sdw_master_device *md = dev_to_sdw_master_device(dev); \
+ return sprintf(buf, format_string, md->bus->prop.field); \
+} \
+static DEVICE_ATTR_RO(field)
+
+sdw_master_attr(revision, "0x%x\n");
+sdw_master_attr(clk_stop_modes, "0x%x\n");
+sdw_master_attr(max_clk_freq, "%d\n");
+sdw_master_attr(default_row, "%d\n");
+sdw_master_attr(default_col, "%d\n");
+sdw_master_attr(default_frame_rate, "%d\n");
+sdw_master_attr(dynamic_frame, "%d\n");
+sdw_master_attr(err_threshold, "%d\n");
+
+static ssize_t clock_frequencies_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct sdw_master_device *md = dev_to_sdw_master_device(dev);
+ ssize_t size = 0;
+ int i;
+
+ for (i = 0; i < md->bus->prop.num_clk_freq; i++)
+ size += sprintf(buf + size, "%8d ",
+ md->bus->prop.clk_freq[i]);
+ size += sprintf(buf + size, "\n");
+
+ return size;
+}
+static DEVICE_ATTR_RO(clock_frequencies);
+
+static ssize_t clock_gears_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct sdw_master_device *md = dev_to_sdw_master_device(dev);
+ ssize_t size = 0;
+ int i;
+
+ for (i = 0; i < md->bus->prop.num_clk_gears; i++)
+ size += sprintf(buf + size, "%8d ",
+ md->bus->prop.clk_gears[i]);
+ size += sprintf(buf + size, "\n");
+
+ return size;
+}
+static DEVICE_ATTR_RO(clock_gears);
+
+static struct attribute *master_node_attrs[] = {
+ &dev_attr_revision.attr,
+ &dev_attr_clk_stop_modes.attr,
+ &dev_attr_max_clk_freq.attr,
+ &dev_attr_default_row.attr,
+ &dev_attr_default_col.attr,
+ &dev_attr_default_frame_rate.attr,
+ &dev_attr_dynamic_frame.attr,
+ &dev_attr_err_threshold.attr,
+ &dev_attr_clock_frequencies.attr,
+ &dev_attr_clock_gears.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(master_node);
+
static void sdw_master_device_release(struct device *dev)
{
struct sdw_master_device *md = dev_to_sdw_master_device(dev);
@@ -48,6 +131,7 @@ int sdw_master_device_add(struct sdw_bus *bus, struct device *parent,
md->dev.bus = &sdw_bus_type;
md->dev.type = &sdw_master_type;
md->dev.parent = parent;
+ md->dev.groups = master_node_groups;
md->dev.of_node = parent->of_node;
md->dev.fwnode = fwnode;
md->dev.dma_mask = parent->dma_mask;
