189 lines
4.8 KiB
C
189 lines
4.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright(c) 2019-2020 Intel Corporation.
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#include <linux/device.h>
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#include <linux/acpi.h>
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#include <linux/pm_runtime.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_type.h>
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#include "bus.h"
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/*
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* The 3s value for autosuspend will only be used if there are no
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* devices physically attached on a bus segment. In practice enabling
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* the bus operation will result in children devices become active and
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* the master device will only suspend when all its children are no
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* longer active.
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*/
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#define SDW_MASTER_SUSPEND_DELAY_MS 3000
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/*
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* The sysfs for properties reflects the MIPI description as given
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* in the MIPI DisCo spec
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*
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* Base file is:
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* sdw-master-N
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* |---- revision
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* |---- clk_stop_modes
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* |---- max_clk_freq
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* |---- clk_freq
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* |---- clk_gears
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* |---- default_row
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* |---- default_col
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* |---- dynamic_shape
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* |---- err_threshold
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*/
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#define sdw_master_attr(field, format_string) \
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static ssize_t field##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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struct sdw_master_device *md = dev_to_sdw_master_device(dev); \
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return sprintf(buf, format_string, md->bus->prop.field); \
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} \
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static DEVICE_ATTR_RO(field)
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sdw_master_attr(revision, "0x%x\n");
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sdw_master_attr(clk_stop_modes, "0x%x\n");
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sdw_master_attr(max_clk_freq, "%d\n");
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sdw_master_attr(default_row, "%d\n");
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sdw_master_attr(default_col, "%d\n");
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sdw_master_attr(default_frame_rate, "%d\n");
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sdw_master_attr(dynamic_frame, "%d\n");
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sdw_master_attr(err_threshold, "%d\n");
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static ssize_t clock_frequencies_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_master_device *md = dev_to_sdw_master_device(dev);
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ssize_t size = 0;
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int i;
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for (i = 0; i < md->bus->prop.num_clk_freq; i++)
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size += sprintf(buf + size, "%8d ",
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md->bus->prop.clk_freq[i]);
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size += sprintf(buf + size, "\n");
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return size;
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}
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static DEVICE_ATTR_RO(clock_frequencies);
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static ssize_t clock_gears_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_master_device *md = dev_to_sdw_master_device(dev);
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ssize_t size = 0;
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int i;
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for (i = 0; i < md->bus->prop.num_clk_gears; i++)
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size += sprintf(buf + size, "%8d ",
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md->bus->prop.clk_gears[i]);
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size += sprintf(buf + size, "\n");
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return size;
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}
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static DEVICE_ATTR_RO(clock_gears);
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static struct attribute *master_node_attrs[] = {
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&dev_attr_revision.attr,
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&dev_attr_clk_stop_modes.attr,
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&dev_attr_max_clk_freq.attr,
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&dev_attr_default_row.attr,
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&dev_attr_default_col.attr,
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&dev_attr_default_frame_rate.attr,
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&dev_attr_dynamic_frame.attr,
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&dev_attr_err_threshold.attr,
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&dev_attr_clock_frequencies.attr,
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&dev_attr_clock_gears.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(master_node);
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static void sdw_master_device_release(struct device *dev)
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{
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struct sdw_master_device *md = dev_to_sdw_master_device(dev);
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kfree(md);
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}
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static const struct dev_pm_ops master_dev_pm = {
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SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend,
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pm_generic_runtime_resume, NULL)
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};
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struct device_type sdw_master_type = {
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.name = "soundwire_master",
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.release = sdw_master_device_release,
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.pm = &master_dev_pm,
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};
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/**
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* sdw_master_device_add() - create a Linux Master Device representation.
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* @bus: SDW bus instance
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* @parent: parent device
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* @fwnode: firmware node handle
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*/
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int sdw_master_device_add(struct sdw_bus *bus, struct device *parent,
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struct fwnode_handle *fwnode)
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{
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struct sdw_master_device *md;
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int ret;
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if (!parent)
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return -EINVAL;
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md = kzalloc(sizeof(*md), GFP_KERNEL);
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if (!md)
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return -ENOMEM;
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md->dev.bus = &sdw_bus_type;
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md->dev.type = &sdw_master_type;
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md->dev.parent = parent;
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md->dev.groups = master_node_groups;
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md->dev.of_node = parent->of_node;
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md->dev.fwnode = fwnode;
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md->dev.dma_mask = parent->dma_mask;
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dev_set_name(&md->dev, "sdw-master-%d", bus->id);
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ret = device_register(&md->dev);
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if (ret) {
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dev_err(parent, "Failed to add master: ret %d\n", ret);
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/*
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* On err, don't free but drop ref as this will be freed
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* when release method is invoked.
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*/
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put_device(&md->dev);
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goto device_register_err;
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}
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/* add shortcuts to improve code readability/compactness */
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md->bus = bus;
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bus->dev = &md->dev;
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bus->md = md;
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pm_runtime_set_autosuspend_delay(&bus->md->dev, SDW_MASTER_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(&bus->md->dev);
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pm_runtime_mark_last_busy(&bus->md->dev);
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pm_runtime_set_active(&bus->md->dev);
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pm_runtime_enable(&bus->md->dev);
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pm_runtime_idle(&bus->md->dev);
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device_register_err:
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return ret;
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}
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/**
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* sdw_master_device_del() - delete a Linux Master Device representation.
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* @bus: bus handle
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*
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* This function is the dual of sdw_master_device_add()
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*/
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int sdw_master_device_del(struct sdw_bus *bus)
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{
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pm_runtime_disable(&bus->md->dev);
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device_unregister(bus->dev);
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return 0;
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}
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