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51c266561e
"ret" is an int and "buf" is a u8. sdw_read() returns negative error
codes which are truncated to the u8, 0-255 range before being stored as
an int. It means that "ret" can't be less than zero.
Fixes: b0a9c37b01
("soundwire: Add slave status handling")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
998 lines
22 KiB
C
998 lines
22 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-17 Intel Corporation.
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#include <linux/acpi.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pm_runtime.h>
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#include <linux/soundwire/sdw_registers.h>
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#include <linux/soundwire/sdw.h>
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#include "bus.h"
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/**
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* sdw_add_bus_master() - add a bus Master instance
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* @bus: bus instance
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*
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* Initializes the bus instance, read properties and create child
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* devices.
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*/
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int sdw_add_bus_master(struct sdw_bus *bus)
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{
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int ret;
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if (!bus->dev) {
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pr_err("SoundWire bus has no device");
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return -ENODEV;
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}
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if (!bus->ops) {
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dev_err(bus->dev, "SoundWire Bus ops are not set");
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return -EINVAL;
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}
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mutex_init(&bus->msg_lock);
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mutex_init(&bus->bus_lock);
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INIT_LIST_HEAD(&bus->slaves);
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if (bus->ops->read_prop) {
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ret = bus->ops->read_prop(bus);
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if (ret < 0) {
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dev_err(bus->dev, "Bus read properties failed:%d", ret);
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return ret;
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}
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}
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/*
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* Device numbers in SoundWire are 0 thru 15. Enumeration device
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* number (0), Broadcast device number (15), Group numbers (12 and
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* 13) and Master device number (14) are not used for assignment so
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* mask these and other higher bits.
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*/
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/* Set higher order bits */
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*bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
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/* Set enumuration device number and broadcast device number */
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set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
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set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
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/* Set group device numbers and master device number */
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set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
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set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
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set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
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/*
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* SDW is an enumerable bus, but devices can be powered off. So,
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* they won't be able to report as present.
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*
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* Create Slave devices based on Slaves described in
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* the respective firmware (ACPI/DT)
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*/
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if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
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ret = sdw_acpi_find_slaves(bus);
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else
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ret = -ENOTSUPP; /* No ACPI/DT so error out */
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if (ret) {
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dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL(sdw_add_bus_master);
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static int sdw_delete_slave(struct device *dev, void *data)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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struct sdw_bus *bus = slave->bus;
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mutex_lock(&bus->bus_lock);
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if (slave->dev_num) /* clear dev_num if assigned */
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clear_bit(slave->dev_num, bus->assigned);
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list_del_init(&slave->node);
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mutex_unlock(&bus->bus_lock);
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device_unregister(dev);
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return 0;
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}
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/**
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* sdw_delete_bus_master() - delete the bus master instance
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* @bus: bus to be deleted
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*
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* Remove the instance, delete the child devices.
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*/
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void sdw_delete_bus_master(struct sdw_bus *bus)
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{
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device_for_each_child(bus->dev, NULL, sdw_delete_slave);
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}
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EXPORT_SYMBOL(sdw_delete_bus_master);
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/*
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* SDW IO Calls
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*/
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static inline int find_response_code(enum sdw_command_response resp)
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{
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switch (resp) {
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case SDW_CMD_OK:
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return 0;
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case SDW_CMD_IGNORED:
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return -ENODATA;
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case SDW_CMD_TIMEOUT:
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return -ETIMEDOUT;
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default:
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return -EIO;
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}
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}
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static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
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{
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int retry = bus->prop.err_threshold;
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enum sdw_command_response resp;
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int ret = 0, i;
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for (i = 0; i <= retry; i++) {
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resp = bus->ops->xfer_msg(bus, msg);
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ret = find_response_code(resp);
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/* if cmd is ok or ignored return */
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if (ret == 0 || ret == -ENODATA)
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return ret;
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}
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return ret;
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}
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static inline int do_transfer_defer(struct sdw_bus *bus,
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struct sdw_msg *msg, struct sdw_defer *defer)
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{
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int retry = bus->prop.err_threshold;
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enum sdw_command_response resp;
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int ret = 0, i;
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defer->msg = msg;
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defer->length = msg->len;
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for (i = 0; i <= retry; i++) {
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resp = bus->ops->xfer_msg_defer(bus, msg, defer);
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ret = find_response_code(resp);
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/* if cmd is ok or ignored return */
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if (ret == 0 || ret == -ENODATA)
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return ret;
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}
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return ret;
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}
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static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
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{
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int retry = bus->prop.err_threshold;
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enum sdw_command_response resp;
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int ret = 0, i;
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for (i = 0; i <= retry; i++) {
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resp = bus->ops->reset_page_addr(bus, dev_num);
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ret = find_response_code(resp);
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/* if cmd is ok or ignored return */
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if (ret == 0 || ret == -ENODATA)
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return ret;
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}
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return ret;
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}
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/**
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* sdw_transfer() - Synchronous transfer message to a SDW Slave device
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* @bus: SDW bus
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* @msg: SDW message to be xfered
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*/
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int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
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{
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int ret;
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mutex_lock(&bus->msg_lock);
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ret = do_transfer(bus, msg);
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if (ret != 0 && ret != -ENODATA)
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dev_err(bus->dev, "trf on Slave %d failed:%d\n",
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msg->dev_num, ret);
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if (msg->page)
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sdw_reset_page(bus, msg->dev_num);
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mutex_unlock(&bus->msg_lock);
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return ret;
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}
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/**
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* sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device
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* @bus: SDW bus
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* @msg: SDW message to be xfered
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* @defer: Defer block for signal completion
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*
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* Caller needs to hold the msg_lock lock while calling this
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*/
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int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
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struct sdw_defer *defer)
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{
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int ret;
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if (!bus->ops->xfer_msg_defer)
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return -ENOTSUPP;
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ret = do_transfer_defer(bus, msg, defer);
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if (ret != 0 && ret != -ENODATA)
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dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
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msg->dev_num, ret);
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if (msg->page)
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sdw_reset_page(bus, msg->dev_num);
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return ret;
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}
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int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
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u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
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{
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memset(msg, 0, sizeof(*msg));
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msg->addr = addr; /* addr is 16 bit and truncated here */
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msg->len = count;
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msg->dev_num = dev_num;
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msg->flags = flags;
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msg->buf = buf;
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msg->ssp_sync = false;
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msg->page = false;
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if (addr < SDW_REG_NO_PAGE) { /* no paging area */
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return 0;
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} else if (addr >= SDW_REG_MAX) { /* illegal addr */
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pr_err("SDW: Invalid address %x passed\n", addr);
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return -EINVAL;
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}
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if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */
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if (slave && !slave->prop.paging_support)
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return 0;
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/* no need for else as that will fall thru to paging */
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}
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/* paging mandatory */
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if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
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pr_err("SDW: Invalid device for paging :%d\n", dev_num);
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return -EINVAL;
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}
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if (!slave) {
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pr_err("SDW: No slave for paging addr\n");
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return -EINVAL;
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} else if (!slave->prop.paging_support) {
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dev_err(&slave->dev,
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"address %x needs paging but no support", addr);
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return -EINVAL;
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}
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msg->addr_page1 = (addr >> SDW_REG_SHIFT(SDW_SCP_ADDRPAGE1_MASK));
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msg->addr_page2 = (addr >> SDW_REG_SHIFT(SDW_SCP_ADDRPAGE2_MASK));
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msg->addr |= BIT(15);
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msg->page = true;
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return 0;
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}
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/**
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* sdw_nread() - Read "n" contiguous SDW Slave registers
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* @slave: SDW Slave
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* @addr: Register address
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* @count: length
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* @val: Buffer for values to be read
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*/
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int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
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{
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struct sdw_msg msg;
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int ret;
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ret = sdw_fill_msg(&msg, slave, addr, count,
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slave->dev_num, SDW_MSG_FLAG_READ, val);
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if (ret < 0)
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return ret;
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ret = pm_runtime_get_sync(slave->bus->dev);
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if (ret < 0)
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return ret;
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ret = sdw_transfer(slave->bus, &msg);
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pm_runtime_put(slave->bus->dev);
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return ret;
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}
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EXPORT_SYMBOL(sdw_nread);
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/**
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* sdw_nwrite() - Write "n" contiguous SDW Slave registers
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* @slave: SDW Slave
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* @addr: Register address
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* @count: length
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* @val: Buffer for values to be read
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*/
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int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
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{
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struct sdw_msg msg;
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int ret;
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ret = sdw_fill_msg(&msg, slave, addr, count,
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slave->dev_num, SDW_MSG_FLAG_WRITE, val);
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if (ret < 0)
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return ret;
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ret = pm_runtime_get_sync(slave->bus->dev);
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if (ret < 0)
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return ret;
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ret = sdw_transfer(slave->bus, &msg);
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pm_runtime_put(slave->bus->dev);
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return ret;
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}
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EXPORT_SYMBOL(sdw_nwrite);
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/**
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* sdw_read() - Read a SDW Slave register
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* @slave: SDW Slave
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* @addr: Register address
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*/
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int sdw_read(struct sdw_slave *slave, u32 addr)
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{
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u8 buf;
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int ret;
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ret = sdw_nread(slave, addr, 1, &buf);
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if (ret < 0)
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return ret;
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else
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return buf;
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}
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EXPORT_SYMBOL(sdw_read);
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/**
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* sdw_write() - Write a SDW Slave register
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* @slave: SDW Slave
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* @addr: Register address
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* @value: Register value
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*/
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int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
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{
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return sdw_nwrite(slave, addr, 1, &value);
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}
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EXPORT_SYMBOL(sdw_write);
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/*
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* SDW alert handling
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*/
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/* called with bus_lock held */
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static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
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{
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struct sdw_slave *slave = NULL;
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list_for_each_entry(slave, &bus->slaves, node) {
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if (slave->dev_num == i)
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return slave;
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}
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return NULL;
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}
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static int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
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{
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if ((slave->id.unique_id != id.unique_id) ||
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(slave->id.mfg_id != id.mfg_id) ||
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(slave->id.part_id != id.part_id) ||
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(slave->id.class_id != id.class_id))
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return -ENODEV;
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return 0;
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}
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/* called with bus_lock held */
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static int sdw_get_device_num(struct sdw_slave *slave)
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{
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int bit;
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bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
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if (bit == SDW_MAX_DEVICES) {
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bit = -ENODEV;
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goto err;
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}
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/*
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* Do not update dev_num in Slave data structure here,
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* Update once program dev_num is successful
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*/
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set_bit(bit, slave->bus->assigned);
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err:
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return bit;
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}
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static int sdw_assign_device_num(struct sdw_slave *slave)
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{
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int ret, dev_num;
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/* check first if device number is assigned, if so reuse that */
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if (!slave->dev_num) {
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mutex_lock(&slave->bus->bus_lock);
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dev_num = sdw_get_device_num(slave);
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mutex_unlock(&slave->bus->bus_lock);
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if (dev_num < 0) {
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dev_err(slave->bus->dev, "Get dev_num failed: %d",
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dev_num);
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return dev_num;
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}
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} else {
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dev_info(slave->bus->dev,
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"Slave already registered dev_num:%d",
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slave->dev_num);
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/* Clear the slave->dev_num to transfer message on device 0 */
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dev_num = slave->dev_num;
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slave->dev_num = 0;
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}
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ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
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if (ret < 0) {
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dev_err(&slave->dev, "Program device_num failed: %d", ret);
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return ret;
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}
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/* After xfer of msg, restore dev_num */
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slave->dev_num = dev_num;
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return 0;
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}
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void sdw_extract_slave_id(struct sdw_bus *bus,
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u64 addr, struct sdw_slave_id *id)
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{
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dev_dbg(bus->dev, "SDW Slave Addr: %llx", addr);
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/*
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* Spec definition
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* Register Bit Contents
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* DevId_0 [7:4] 47:44 sdw_version
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* DevId_0 [3:0] 43:40 unique_id
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* DevId_1 39:32 mfg_id [15:8]
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* DevId_2 31:24 mfg_id [7:0]
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* DevId_3 23:16 part_id [15:8]
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* DevId_4 15:08 part_id [7:0]
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* DevId_5 07:00 class_id
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*/
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id->sdw_version = (addr >> 44) & GENMASK(3, 0);
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id->unique_id = (addr >> 40) & GENMASK(3, 0);
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id->mfg_id = (addr >> 24) & GENMASK(15, 0);
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id->part_id = (addr >> 8) & GENMASK(15, 0);
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id->class_id = addr & GENMASK(7, 0);
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dev_dbg(bus->dev,
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"SDW Slave class_id %x, part_id %x, mfg_id %x, unique_id %x, version %x",
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id->class_id, id->part_id, id->mfg_id,
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id->unique_id, id->sdw_version);
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}
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static int sdw_program_device_num(struct sdw_bus *bus)
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{
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u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
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struct sdw_slave *slave, *_s;
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struct sdw_slave_id id;
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struct sdw_msg msg;
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bool found = false;
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int count = 0, ret;
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u64 addr;
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/* No Slave, so use raw xfer api */
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ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
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SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
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if (ret < 0)
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return ret;
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do {
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ret = sdw_transfer(bus, &msg);
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if (ret == -ENODATA) { /* end of device id reads */
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ret = 0;
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break;
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}
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if (ret < 0) {
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dev_err(bus->dev, "DEVID read fail:%d\n", ret);
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break;
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}
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/*
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* Construct the addr and extract. Cast the higher shift
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* bits to avoid truncation due to size limit.
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*/
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addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
|
|
((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
|
|
((u64)buf[0] << 40);
|
|
|
|
sdw_extract_slave_id(bus, addr, &id);
|
|
|
|
/* Now compare with entries */
|
|
list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
|
|
if (sdw_compare_devid(slave, id) == 0) {
|
|
found = true;
|
|
|
|
/*
|
|
* Assign a new dev_num to this Slave and
|
|
* not mark it present. It will be marked
|
|
* present after it reports ATTACHED on new
|
|
* dev_num
|
|
*/
|
|
ret = sdw_assign_device_num(slave);
|
|
if (ret) {
|
|
dev_err(slave->bus->dev,
|
|
"Assign dev_num failed:%d",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found == false) {
|
|
/* TODO: Park this device in Group 13 */
|
|
dev_err(bus->dev, "Slave Entry not found");
|
|
}
|
|
|
|
count++;
|
|
|
|
/*
|
|
* Check till error out or retry (count) exhausts.
|
|
* Device can drop off and rejoin during enumeration
|
|
* so count till twice the bound.
|
|
*/
|
|
|
|
} while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sdw_modify_slave_status(struct sdw_slave *slave,
|
|
enum sdw_slave_status status)
|
|
{
|
|
mutex_lock(&slave->bus->bus_lock);
|
|
slave->status = status;
|
|
mutex_unlock(&slave->bus->bus_lock);
|
|
}
|
|
|
|
static int sdw_initialize_slave(struct sdw_slave *slave)
|
|
{
|
|
struct sdw_slave_prop *prop = &slave->prop;
|
|
int ret;
|
|
u8 val;
|
|
|
|
/*
|
|
* Set bus clash, parity and SCP implementation
|
|
* defined interrupt mask
|
|
* TODO: Read implementation defined interrupt mask
|
|
* from Slave property
|
|
*/
|
|
val = SDW_SCP_INT1_IMPL_DEF | SDW_SCP_INT1_BUS_CLASH |
|
|
SDW_SCP_INT1_PARITY;
|
|
|
|
/* Enable SCP interrupts */
|
|
ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INTMASK1 write failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* No need to continue if DP0 is not present */
|
|
if (!slave->prop.dp0_prop)
|
|
return 0;
|
|
|
|
/* Enable DP0 interrupts */
|
|
val = prop->dp0_prop->device_interrupts;
|
|
val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
|
|
|
|
ret = sdw_update(slave, SDW_DP0_INTMASK, val, val);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DP0_INTMASK read failed:%d", ret);
|
|
return val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
|
|
{
|
|
u8 clear = 0, impl_int_mask;
|
|
int status, status2, ret, count = 0;
|
|
|
|
status = sdw_read(slave, SDW_DP0_INT);
|
|
if (status < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DP0_INT read failed:%d", status);
|
|
return status;
|
|
}
|
|
|
|
do {
|
|
|
|
if (status & SDW_DP0_INT_TEST_FAIL) {
|
|
dev_err(&slave->dev, "Test fail for port 0");
|
|
clear |= SDW_DP0_INT_TEST_FAIL;
|
|
}
|
|
|
|
/*
|
|
* Assumption: PORT_READY interrupt will be received only for
|
|
* ports implementing Channel Prepare state machine (CP_SM)
|
|
*/
|
|
|
|
if (status & SDW_DP0_INT_PORT_READY) {
|
|
complete(&slave->port_ready[0]);
|
|
clear |= SDW_DP0_INT_PORT_READY;
|
|
}
|
|
|
|
if (status & SDW_DP0_INT_BRA_FAILURE) {
|
|
dev_err(&slave->dev, "BRA failed");
|
|
clear |= SDW_DP0_INT_BRA_FAILURE;
|
|
}
|
|
|
|
impl_int_mask = SDW_DP0_INT_IMPDEF1 |
|
|
SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
|
|
|
|
if (status & impl_int_mask) {
|
|
clear |= impl_int_mask;
|
|
*slave_status = clear;
|
|
}
|
|
|
|
/* clear the interrupt */
|
|
ret = sdw_write(slave, SDW_DP0_INT, clear);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DP0_INT write failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Read DP0 interrupt again */
|
|
status2 = sdw_read(slave, SDW_DP0_INT);
|
|
if (status2 < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DP0_INT read failed:%d", status2);
|
|
return status2;
|
|
}
|
|
status &= status2;
|
|
|
|
count++;
|
|
|
|
/* we can get alerts while processing so keep retrying */
|
|
} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
|
|
|
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
|
dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdw_handle_port_interrupt(struct sdw_slave *slave,
|
|
int port, u8 *slave_status)
|
|
{
|
|
u8 clear = 0, impl_int_mask;
|
|
int status, status2, ret, count = 0;
|
|
u32 addr;
|
|
|
|
if (port == 0)
|
|
return sdw_handle_dp0_interrupt(slave, slave_status);
|
|
|
|
addr = SDW_DPN_INT(port);
|
|
status = sdw_read(slave, addr);
|
|
if (status < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DPN_INT read failed:%d", status);
|
|
|
|
return status;
|
|
}
|
|
|
|
do {
|
|
|
|
if (status & SDW_DPN_INT_TEST_FAIL) {
|
|
dev_err(&slave->dev, "Test fail for port:%d", port);
|
|
clear |= SDW_DPN_INT_TEST_FAIL;
|
|
}
|
|
|
|
/*
|
|
* Assumption: PORT_READY interrupt will be received only
|
|
* for ports implementing CP_SM.
|
|
*/
|
|
if (status & SDW_DPN_INT_PORT_READY) {
|
|
complete(&slave->port_ready[port]);
|
|
clear |= SDW_DPN_INT_PORT_READY;
|
|
}
|
|
|
|
impl_int_mask = SDW_DPN_INT_IMPDEF1 |
|
|
SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
|
|
|
|
|
|
if (status & impl_int_mask) {
|
|
clear |= impl_int_mask;
|
|
*slave_status = clear;
|
|
}
|
|
|
|
/* clear the interrupt */
|
|
ret = sdw_write(slave, addr, clear);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DPN_INT write failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Read DPN interrupt again */
|
|
status2 = sdw_read(slave, addr);
|
|
if (status2 < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_DPN_INT read failed:%d", status2);
|
|
return status2;
|
|
}
|
|
status &= status2;
|
|
|
|
count++;
|
|
|
|
/* we can get alerts while processing so keep retrying */
|
|
} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
|
|
|
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
|
dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdw_handle_slave_alerts(struct sdw_slave *slave)
|
|
{
|
|
struct sdw_slave_intr_status slave_intr;
|
|
u8 clear = 0, bit, port_status[15];
|
|
int port_num, stat, ret, count = 0;
|
|
unsigned long port;
|
|
bool slave_notify = false;
|
|
u8 buf, buf2[2], _buf, _buf2[2];
|
|
|
|
sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
|
|
|
|
/* Read Instat 1, Instat 2 and Instat 3 registers */
|
|
buf = ret = sdw_read(slave, SDW_SCP_INT1);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INT1 read failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INT2/3 read failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
do {
|
|
/*
|
|
* Check parity, bus clash and Slave (impl defined)
|
|
* interrupt
|
|
*/
|
|
if (buf & SDW_SCP_INT1_PARITY) {
|
|
dev_err(&slave->dev, "Parity error detected");
|
|
clear |= SDW_SCP_INT1_PARITY;
|
|
}
|
|
|
|
if (buf & SDW_SCP_INT1_BUS_CLASH) {
|
|
dev_err(&slave->dev, "Bus clash error detected");
|
|
clear |= SDW_SCP_INT1_BUS_CLASH;
|
|
}
|
|
|
|
/*
|
|
* When bus clash or parity errors are detected, such errors
|
|
* are unlikely to be recoverable errors.
|
|
* TODO: In such scenario, reset bus. Make this configurable
|
|
* via sysfs property with bus reset being the default.
|
|
*/
|
|
|
|
if (buf & SDW_SCP_INT1_IMPL_DEF) {
|
|
dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
|
|
clear |= SDW_SCP_INT1_IMPL_DEF;
|
|
slave_notify = true;
|
|
}
|
|
|
|
/* Check port 0 - 3 interrupts */
|
|
port = buf & SDW_SCP_INT1_PORT0_3;
|
|
|
|
/* To get port number corresponding to bits, shift it */
|
|
port = port >> SDW_REG_SHIFT(SDW_SCP_INT1_PORT0_3);
|
|
for_each_set_bit(bit, &port, 8) {
|
|
sdw_handle_port_interrupt(slave, bit,
|
|
&port_status[bit]);
|
|
|
|
}
|
|
|
|
/* Check if cascade 2 interrupt is present */
|
|
if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
|
|
port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
|
|
for_each_set_bit(bit, &port, 8) {
|
|
/* scp2 ports start from 4 */
|
|
port_num = bit + 3;
|
|
sdw_handle_port_interrupt(slave,
|
|
port_num,
|
|
&port_status[port_num]);
|
|
}
|
|
}
|
|
|
|
/* now check last cascade */
|
|
if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
|
|
port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
|
|
for_each_set_bit(bit, &port, 8) {
|
|
/* scp3 ports start from 11 */
|
|
port_num = bit + 10;
|
|
sdw_handle_port_interrupt(slave,
|
|
port_num,
|
|
&port_status[port_num]);
|
|
}
|
|
}
|
|
|
|
/* Update the Slave driver */
|
|
if (slave_notify && (slave->ops) &&
|
|
(slave->ops->interrupt_callback)) {
|
|
slave_intr.control_port = clear;
|
|
memcpy(slave_intr.port, &port_status,
|
|
sizeof(slave_intr.port));
|
|
|
|
slave->ops->interrupt_callback(slave, &slave_intr);
|
|
}
|
|
|
|
/* Ack interrupt */
|
|
ret = sdw_write(slave, SDW_SCP_INT1, clear);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INT1 write failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read status again to ensure no new interrupts arrived
|
|
* while servicing interrupts.
|
|
*/
|
|
_buf = ret = sdw_read(slave, SDW_SCP_INT1);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INT1 read failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2);
|
|
if (ret < 0) {
|
|
dev_err(slave->bus->dev,
|
|
"SDW_SCP_INT2/3 read failed:%d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Make sure no interrupts are pending */
|
|
buf &= _buf;
|
|
buf2[0] &= _buf2[0];
|
|
buf2[1] &= _buf2[1];
|
|
stat = buf || buf2[0] || buf2[1];
|
|
|
|
/*
|
|
* Exit loop if Slave is continuously in ALERT state even
|
|
* after servicing the interrupt multiple times.
|
|
*/
|
|
count++;
|
|
|
|
/* we can get alerts while processing so keep retrying */
|
|
} while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
|
|
|
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
|
dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdw_update_slave_status(struct sdw_slave *slave,
|
|
enum sdw_slave_status status)
|
|
{
|
|
if ((slave->ops) && (slave->ops->update_status))
|
|
return slave->ops->update_status(slave, status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sdw_handle_slave_status() - Handle Slave status
|
|
* @bus: SDW bus instance
|
|
* @status: Status for all Slave(s)
|
|
*/
|
|
int sdw_handle_slave_status(struct sdw_bus *bus,
|
|
enum sdw_slave_status status[])
|
|
{
|
|
enum sdw_slave_status prev_status;
|
|
struct sdw_slave *slave;
|
|
int i, ret = 0;
|
|
|
|
if (status[0] == SDW_SLAVE_ATTACHED) {
|
|
ret = sdw_program_device_num(bus);
|
|
if (ret)
|
|
dev_err(bus->dev, "Slave attach failed: %d", ret);
|
|
}
|
|
|
|
/* Continue to check other slave statuses */
|
|
for (i = 1; i <= SDW_MAX_DEVICES; i++) {
|
|
mutex_lock(&bus->bus_lock);
|
|
if (test_bit(i, bus->assigned) == false) {
|
|
mutex_unlock(&bus->bus_lock);
|
|
continue;
|
|
}
|
|
mutex_unlock(&bus->bus_lock);
|
|
|
|
slave = sdw_get_slave(bus, i);
|
|
if (!slave)
|
|
continue;
|
|
|
|
switch (status[i]) {
|
|
case SDW_SLAVE_UNATTACHED:
|
|
if (slave->status == SDW_SLAVE_UNATTACHED)
|
|
break;
|
|
|
|
sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
|
|
break;
|
|
|
|
case SDW_SLAVE_ALERT:
|
|
ret = sdw_handle_slave_alerts(slave);
|
|
if (ret)
|
|
dev_err(bus->dev,
|
|
"Slave %d alert handling failed: %d",
|
|
i, ret);
|
|
break;
|
|
|
|
case SDW_SLAVE_ATTACHED:
|
|
if (slave->status == SDW_SLAVE_ATTACHED)
|
|
break;
|
|
|
|
prev_status = slave->status;
|
|
sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
|
|
|
|
if (prev_status == SDW_SLAVE_ALERT)
|
|
break;
|
|
|
|
ret = sdw_initialize_slave(slave);
|
|
if (ret)
|
|
dev_err(bus->dev,
|
|
"Slave %d initialization failed: %d",
|
|
i, ret);
|
|
|
|
break;
|
|
|
|
default:
|
|
dev_err(bus->dev, "Invalid slave %d status:%d",
|
|
i, status[i]);
|
|
break;
|
|
}
|
|
|
|
ret = sdw_update_slave_status(slave, status[i]);
|
|
if (ret)
|
|
dev_err(slave->bus->dev,
|
|
"Update Slave status failed:%d", ret);
|
|
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(sdw_handle_slave_status);
|