diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2020-05-19 04:35:50 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-05-20 17:22:36 +0530 |
| commit | c5778ca49a19420c67dbeff0744a3b3b75ef4e1a (patch) | |
| tree | 2ebe09043b3f5f8ba75ea4364f03c6d6bf6e12f2 /drivers/soundwire | |
| parent | 6bf393c577c4a6e324ab103425fbf71126e5385b (diff) | |
| download | linux-c5778ca49a19420c67dbeff0744a3b3b75ef4e1a.tar.bz2 | |
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>
Diffstat (limited to 'drivers/soundwire')
| -rw-r--r-- | drivers/soundwire/master.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c index 5411791e6aff..5f0b2189defe 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; |