// SPDX-License-Identifier: GPL-2.0
/*
* SVC Greybus driver.
*
* Copyright 2015 Google Inc.
* Copyright 2015 Linaro Ltd.
*/
#include <linux/debugfs.h>
#include <linux/kstrtox.h>
#include <linux/workqueue.h>
#include <linux/greybus.h>
#define SVC_INTF_EJECT_TIMEOUT 9000
#define SVC_INTF_ACTIVATE_TIMEOUT 6000
#define SVC_INTF_RESUME_TIMEOUT 3000
struct gb_svc_deferred_request {
struct work_struct work;
struct gb_operation *operation;
};
static int gb_svc_queue_deferred_request(struct gb_operation *operation);
static ssize_t endo_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
return sprintf(buf, "0x%04x\n", svc->endo_id);
}
static DEVICE_ATTR_RO(endo_id);
static ssize_t ap_intf_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
return sprintf(buf, "%u\n", svc->ap_intf_id);
}
static DEVICE_ATTR_RO(ap_intf_id);
// FIXME
// This is a hack, we need to do this "right" and clean the interface up
// properly, not just forcibly yank the thing out of the system and hope for the
// best. But for now, people want their modules to come out without having to
// throw the thing to the ground or get out a screwdriver.
static ssize_t intf_eject_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t len)
{
struct gb_svc *svc = to_gb_svc(dev);
unsigned short intf_id;
int ret;
ret = kstrtou16(buf, 10, &intf_id);
if (ret < 0)
return ret;
dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
ret = gb_svc_intf_eject(svc, intf_id);
if (ret < 0)
return ret;
return len;
}
static DEVICE_ATTR_WO(intf_eject);
static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
return sprintf(buf, "%s\n",
gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
}
static ssize_t watchdog_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t len)
{
struct gb_svc *svc = to_gb_svc(dev);
int retval;
bool user_request;
retval = kstrtobool(buf, &user_request);
if (retval)
return retval;
if (user_request)
retval = gb_svc_watchdog_enable(svc);
else
retval = gb_svc_watchdog_disable(svc);
if (retval)
return retval;
return len;
}
static DEVICE_ATTR_RW(watchdog);
static ssize_t watchdog_action_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
return sprintf(buf, "panic\n");
else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
return sprintf(buf, "reset\n");
return -EINVAL;
}
static ssize_t watchdog_action_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct gb_svc *svc = to_gb_svc(dev);
if (sysfs_streq(buf, "panic"))
svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
else if (sysfs_streq(buf, "reset"))
svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
else
return -EINVAL;
return len;
}
static DEVICE_ATTR_RW(watchdog_action);
static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
{
struct gb_svc_pwrmon_rail_count_get_response response;
int ret;
ret = gb_operation_sync(svc->connection,
GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
return ret;
}
*value = response.rail_count;
return 0;
}
static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
struct gb_svc_pwrmon_rail_names_get_response *response,
size_t bufsize)
{
int ret;
ret = gb_operation_sync(svc->connection,
GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
response, bufsize);
if (ret) {
dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
return ret;
}
if (response->status != GB_SVC_OP_SUCCESS) {
dev_err(&svc->dev,
"SVC error while getting rail names: %u\n",
response->status);
return -EREMOTEIO;
}
return 0;
}
static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
u8 measurement_type, u32 *value)
{
struct gb_svc_pwrmon_sample_get_request request;
struct gb_svc_pwrmon_sample_get_response response;
int ret;
request.rail_id = rail_id;
request.measurement_type = measurement_type;
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
return ret;
}
if (response.result) {
dev_err(&svc->dev,
"UniPro error while getting rail power sample (%d %d): %d\n",
rail_id, measurement_type, response.result);
switch (response.result) {
case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
return -EINVAL;
case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
return -ENOMSG;
default:
return -EREMOTEIO;
}
}
*value = le32_to_cpu(response.measurement);
return 0;
}
int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
u8 measurement_type, u32 *value)
{
struct gb_svc_pwrmon_intf_sample_get_request request;
struct gb_svc_pwrmon_intf_sample_get_response response;
int ret;
request.intf_id = intf_id;
request.measurement_type = measurement_type;
ret = gb_operation_sync(svc->connection,
GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
return ret;
}
if (response.result) {
dev_err(&svc->dev,
"UniPro error while getting intf power sample (%d %d): %d\n",
intf_id, measurement_type, response.result);
switch (response.result) {
case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
return -EINVAL;
case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
return -ENOMSG;
default:
return -EREMOTEIO;
}
}
*value = le32_to_cpu(response.measurement);
return 0;
}
static struct attribute *svc_attrs[] = {
&dev_attr_endo_id.attr,
&dev_attr_ap_intf_id.attr,
&dev_attr_intf_eject.attr,
&dev_attr_watchdog.attr,
&dev_attr_watchdog_action.attr,
NULL,
};
ATTRIBUTE_GROUPS(svc);
int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
{
struct gb_svc_intf_device_id_request request;
request.intf_id = intf_id;
request.device_id = device_id;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
&request, sizeof(request), NULL, 0);
}
int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
{
struct gb_svc_intf_eject_request request;
int ret;
request.intf_id = intf_id;
/*
* The pulse width for module release in svc is long so we need to
* increase the timeout so the operation will not return to soon.
*/
ret = gb_operation_sync_timeout(svc->connection,
GB_SVC_TYPE_INTF_EJECT, &request,
sizeof(request), NULL, 0,
SVC_INTF_EJECT_TIMEOUT);
if (ret) {
dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
return ret;
}
return 0;
}
int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
{
struct gb_svc_intf_vsys_request request;
struct gb_svc_intf_vsys_response response;
int type, ret;
request.intf_id = intf_id;
if (enable)
type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
else
type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
ret = gb_operation_sync(svc->connection, type,
&request, sizeof(request),
&response, sizeof(response));
if (ret < 0)
return ret;
if (response.result_code != GB_SVC_INTF_VSYS_OK)
return -EREMOTEIO;
return 0;
}
int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
{
struct gb_svc_intf_refclk_request request;
struct gb_svc_intf_refclk_response response;
int type, ret;
request.intf_id = intf_id;
if (enable)
type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
else
type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
ret = gb_operation_sync(svc->connection, type,
&request, sizeof(request),
&response, sizeof(response));
if (ret < 0)
return ret;
if (response.result_code != GB_SVC_INTF_REFCLK_OK)
return -EREMOTEIO;
return 0;
}
int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
{
struct gb_svc_intf_unipro_request request;
struct gb_svc_intf_unipro_response response;
int type, ret;
request.intf_id = intf_id;
if (enable)
type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
else
type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
ret = gb_operation_sync(svc->connection, type,
&request, sizeof(request),
&response, sizeof(response));
if (ret < 0)
return ret;
if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
return -EREMOTEIO;
return 0;
}
int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
{
struct gb_svc_intf_activate_request request;
struct gb_svc_intf_activate_response response;
int ret;
request.intf_id = intf_id;
ret = gb_operation_sync_timeout(svc->connection,
GB_SVC_TYPE_INTF_ACTIVATE,
&request, sizeof(request),
&response, sizeof(response),
SVC_INTF_ACTIVATE_TIMEOUT);
if (ret < 0)
return ret;
if (response.status != GB_SVC_OP_SUCCESS) {
dev_err(&svc->dev, "failed to activate interface %u: %u\n",
intf_id, response.status);
return -EREMOTEIO;
}
*intf_type = response.intf_type;
return 0;
}
int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
{
struct gb_svc_intf_resume_request request;
struct gb_svc_intf_resume_response response;
int ret;
request.intf_id = intf_id;
ret = gb_operation_sync_timeout(svc->connection,
GB_SVC_TYPE_INTF_RESUME,
&request, sizeof(request),
&response, sizeof(response),
SVC_INTF_RESUME_TIMEOUT);
if (ret < 0) {
dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
intf_id, ret);
return ret;
}
if (response.status != GB_SVC_OP_SUCCESS) {
dev_err(&svc->dev, "failed to resume interface %u: %u\n",
intf_id, response.status);
return -EREMOTEIO;
}
return 0;
}
int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
u32 *value)
{
struct gb_svc_dme_peer_get_request request;
struct gb_svc_dme_peer_get_response response;
u16 result;
int ret;
request.intf_id = intf_id;
request.attr = cpu_to_le16(attr);
request.selector = cpu_to_le16(selector);
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
intf_id, attr, selector, ret);
return ret;
}
result = le16_to_cpu(response.result_code);
if (result) {
dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
intf_id, attr, selector, result);
return -EREMOTEIO;
}
if (value)
*value = le32_to_cpu(response.attr_value);
return 0;
}
int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
u32 value)
{
struct gb_svc_dme_peer_set_request request;
struct gb_svc_dme_peer_set_response response;
u16 result;
int ret;
request.intf_id = intf_id;
request.attr = cpu_to_le16(attr);
request.selector = cpu_to_le16(selector);
request.value = cpu_to_le32(value);
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
intf_id, attr, selector, value, ret);
return ret;
}
result = le16_to_cpu(response.result_code);
if (result) {
dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
intf_id, attr, selector, value, result);
return -EREMOTEIO;
}
return 0;
}
int gb_svc_connection_create(struct gb_svc *svc,
u8 intf1_id, u16 cport1_id,
u8 intf2_id, u16 cport2_id,
u8 cport_flags)
{
struct gb_svc_conn_create_request request;
request.intf1_id = intf1_id;
request.cport1_id = cpu_to_le16(cport1_id);
request.intf2_id = intf2_id;
request.cport2_id = cpu_to_le16(cport2_id);
request.tc = 0; /* TC0 */
request.flags = cport_flags;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
&request, sizeof(request), NULL, 0);
}
void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
u8 intf2_id, u16 cport2_id)
{
struct gb_svc_conn_destroy_request request;
struct gb_connection *connection = svc->connection;
int ret;
request.intf1_id = intf1_id;
request.cport1_id = cpu_to_le16(cport1_id);
request.intf2_id = intf2_id;
request.cport2_id = cpu_to_le16(cport2_id);
ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
&request, sizeof(request), NULL, 0);
if (ret) {
dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
intf1_id, cport1_id, intf2_id, cport2_id, ret);
}
}
/* Creates bi-directional routes between the devices */
int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
u8 intf2_id, u8 dev2_id)
{
struct gb_svc_route_create_request request;
request.intf1_id = intf1_id;
request.dev1_id = dev1_id;
request.intf2_id = intf2_id;
request.dev2_id = dev2_id;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
&request, sizeof(request), NULL, 0);
}
/* Destroys bi-directional routes between the devices */
void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
{
struct gb_svc_route_destroy_request request;
int ret;
request.intf1_id = intf1_id;
request.intf2_id = intf2_id;
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
&request, sizeof(request), NULL, 0);
if (ret) {
dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
intf1_id, intf2_id, ret);
}
}
int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
u8 tx_amplitude, u8 tx_hs_equalizer,
u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
u8 flags, u32 quirks,
struct gb_svc_l2_timer_cfg *local,
struct gb_svc_l2_timer_cfg *remote)
{
struct gb_svc_intf_set_pwrm_request request;
struct gb_svc_intf_set_pwrm_response response;
int ret;
u16 result_code;
memset(&request, 0, sizeof(request));
request.intf_id = intf_id;
request.hs_series = hs_series;
request.tx_mode = tx_mode;
request.tx_gear = tx_gear;
request.tx_nlanes = tx_nlanes;
request.tx_amplitude = tx_amplitude;
request.tx_hs_equalizer = tx_hs_equalizer;
request.rx_mode = rx_mode;
request.rx_gear = rx_gear;
request.rx_nlanes = rx_nlanes;
request.flags = flags;
request.quirks = cpu_to_le32(quirks);
if (local)
request.local_l2timerdata = *local;
if (remote)
request.remote_l2timerdata = *remote;
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
&request, sizeof(request),
&response, sizeof(response));
if (ret < 0)
return ret;
result_code = response.result_code;
if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
dev_err(&svc->dev, "set power mode = %d\n", result_code);
return -EIO;
}
return 0;
}
EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
{
struct gb_svc_intf_set_pwrm_request request;
struct gb_svc_intf_set_pwrm_response response;
int ret;
u16 result_code;
memset(&request, 0, sizeof(request));
request.intf_id = intf_id;
request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
&request, sizeof(request),
&response, sizeof(response));
if (ret < 0) {
dev_err(&svc->dev,
"failed to send set power mode operation to interface %u: %d\n",
intf_id, ret);
return ret;
}
result_code = response.result_code;
if (result_code != GB_SVC_SETPWRM_PWR_OK) {
dev_err(&svc->dev,
"failed to hibernate the link for interface %u: %u\n",
intf_id, result_code);
return -EIO;
}
return 0;
}
int gb_svc_ping(struct gb_svc *svc)
{
return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
NULL, 0, NULL, 0,
GB_OPERATION_TIMEOUT_DEFAULT * 2);
}
static int gb_svc_version_request(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_svc_version_request *request;
struct gb_svc_version_response *response;
if (op->request->payload_size < sizeof(*request)) {
dev_err(&svc->dev, "short version request (%zu < %zu)\n",
op->request->payload_size,
sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
if (request->major > GB_SVC_VERSION_MAJOR) {
dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
request->major, GB_SVC_VERSION_MAJOR);
return -ENOTSUPP;
}
svc->protocol_major = request->major;
svc->protocol_minor = request->minor;
if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
return -ENOMEM;
response = op->response->payload;
response->major = svc->protocol_major;
response->minor = svc->protocol_minor;
return 0;
}
static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
struct svc_debugfs_pwrmon_rail *pwrmon_rails =
file_inode(file)->i_private;
struct gb_svc *svc = pwrmon_rails->svc;
int ret, desc;
u32 value;
char buff[16];
ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
GB_SVC_PWRMON_TYPE_VOL, &value);
if (ret) {
dev_err(&svc->dev,
"failed to get voltage sample %u: %d\n",
pwrmon_rails->id, ret);
return ret;
}
desc = scnprintf(buff, sizeof(buff), "%u\n", value);
return simple_read_from_buffer(buf, len, offset, buff, desc);
}
static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
struct svc_debugfs_pwrmon_rail *pwrmon_rails =
file_inode(file)->i_private;
struct gb_svc *svc = pwrmon_rails->svc;
int ret, desc;
u32 value;
char buff[16];
ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
GB_SVC_PWRMON_TYPE_CURR, &value);
if (ret) {
dev_err(&svc->dev,
"failed to get current sample %u: %d\n",
pwrmon_rails->id, ret);
return ret;
}
desc = scnprintf(buff, sizeof(buff), "%u\n", value);
return simple_read_from_buffer(buf, len, offset, buff, desc);
}
static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
struct svc_debugfs_pwrmon_rail *pwrmon_rails =
file_inode(file)->i_private;
struct gb_svc *svc = pwrmon_rails->svc;
int ret, desc;
u32 value;
char buff[16];
ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
GB_SVC_PWRMON_TYPE_PWR, &value);
if (ret) {
dev_err(&svc->dev, "failed to get power sample %u: %d\n",
pwrmon_rails->id, ret);
return ret;
}
desc = scnprintf(buff, sizeof(buff), "%u\n", value);
return simple_read_from_buffer(buf, len, offset, buff, desc);
}
static const struct file_operations pwrmon_debugfs_voltage_fops = {
.read = pwr_debugfs_voltage_read,
};
static const struct file_operations pwrmon_debugfs_current_fops = {
.read = pwr_debugfs_current_read,
};
static const struct file_operations pwrmon_debugfs_power_fops = {
.read = pwr_debugfs_power_read,
};
static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
{
int i;
size_t bufsize;
struct dentry *dent;
struct gb_svc_pwrmon_rail_names_get_response *rail_names;
u8 rail_count;
dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
if (IS_ERR_OR_NULL(dent))
return;
if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
goto err_pwrmon_debugfs;
if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
goto err_pwrmon_debugfs;
bufsize = sizeof(*rail_names) +
GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
rail_names = kzalloc(bufsize, GFP_KERNEL);
if (!rail_names)
goto err_pwrmon_debugfs;
svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
GFP_KERNEL);
if (!svc->pwrmon_rails)
goto err_pwrmon_debugfs_free;
if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
goto err_pwrmon_debugfs_free;
for (i = 0; i < rail_count; i++) {
struct dentry *dir;
struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
snprintf(fname, sizeof(fname), "%s",
(char *)&rail_names->name[i]);
rail->id = i;
rail->svc = svc;
dir = debugfs_create_dir(fname, dent);
debugfs_create_file("voltage_now", 0444, dir, rail,
&pwrmon_debugfs_voltage_fops);
debugfs_create_file("current_now", 0444, dir, rail,
&pwrmon_debugfs_current_fops);
debugfs_create_file("power_now", 0444, dir, rail,
&pwrmon_debugfs_power_fops);
}
kfree(rail_names);
return;
err_pwrmon_debugfs_free:
kfree(rail_names);
kfree(svc->pwrmon_rails);
svc->pwrmon_rails = NULL;
err_pwrmon_debugfs:
debugfs_remove(dent);
}
static void gb_svc_debugfs_init(struct gb_svc *svc)
{
svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
gb_debugfs_get());
gb_svc_pwrmon_debugfs_init(svc);
}
static void gb_svc_debugfs_exit(struct gb_svc *svc)
{
debugfs_remove_recursive(svc->debugfs_dentry);
kfree(svc->pwrmon_rails);
svc->pwrmon_rails = NULL;
}
static int gb_svc_hello(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_svc_hello_request *hello_request;
int ret;
if (op->request->payload_size < sizeof(*hello_request)) {
dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
op->request->payload_size,
sizeof(*hello_request));
return -EINVAL;
}
hello_request = op->request->payload;
svc->endo_id = le16_to_cpu(hello_request->endo_id);
svc->ap_intf_id = hello_request->interface_id;
ret = device_add(&svc->dev);
if (ret) {
dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
return ret;
}
ret = gb_svc_watchdog_create(svc);
if (ret) {
dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
goto err_deregister_svc;
}
/*
* FIXME: This is a temporary hack to reconfigure the link at HELLO
* (which abuses the deferred request processing mechanism).
*/
ret = gb_svc_queue_deferred_request(op);
if (ret)
goto err_destroy_watchdog;
gb_svc_debugfs_init(svc);
return 0;
err_destroy_watchdog:
gb_svc_watchdog_destroy(svc);
err_deregister_svc:
device_del(&svc->dev);
return ret;
}
static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
u8 intf_id)
{
struct gb_host_device *hd = svc->hd;
struct gb_module *module;
size_t num_interfaces;
u8 module_id;
list_for_each_entry(module, &hd->modules, hd_node) {
module_id = module->module_id;
num_interfaces = module->num_interfaces;
if (intf_id >= module_id &&
intf_id < module_id + num_interfaces) {
return module->interfaces[intf_id - module_id];
}
}
return NULL;
}
static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
{
struct gb_host_device *hd = svc->hd;
struct gb_module *module;
list_for_each_entry(module, &hd->modules, hd_node) {
if (module->module_id == module_id)
return module;
}
return NULL;
}
static void gb_svc_process_hello_deferred(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
int ret;
/*
* XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
* link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
* bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
* module.
*
* The code should be removed once SW-2217, Heuristic for UniPro
* Power Mode Changes is resolved.
*/
ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
GB_SVC_UNIPRO_HS_SERIES_A,
GB_SVC_UNIPRO_SLOW_AUTO_MODE,
2, 1,
GB_SVC_SMALL_AMPLITUDE,
GB_SVC_NO_DE_EMPHASIS,
GB_SVC_UNIPRO_SLOW_AUTO_MODE,
2, 1,
0, 0,
NULL, NULL);
if (ret)
dev_warn(&svc->dev,
"power mode change failed on AP to switch link: %d\n",
ret);
}
static void gb_svc_process_module_inserted(struct gb_operation *operation)
{
struct gb_svc_module_inserted_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_host_device *hd = svc->hd;
struct gb_module *module;
size_t num_interfaces;
u8 module_id;
u16 flags;
int ret;
/* The request message size has already been verified. */
request = operation->request->payload;
module_id = request->primary_intf_id;
num_interfaces = request->intf_count;
flags = le16_to_cpu(request->flags);
dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
__func__, module_id, num_interfaces, flags);
if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
dev_warn(&svc->dev, "no primary interface detected on module %u\n",
module_id);
}
module = gb_svc_module_lookup(svc, module_id);
if (module) {
dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
module_id);
return;
}
module = gb_module_create(hd, module_id, num_interfaces);
if (!module) {
dev_err(&svc->dev, "failed to create module\n");
return;
}
ret = gb_module_add(module);
if (ret) {
gb_module_put(module);
return;
}
list_add(&module->hd_node, &hd->modules);
}
static void gb_svc_process_module_removed(struct gb_operation *operation)
{
struct gb_svc_module_removed_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_module *module;
u8 module_id;
/* The request message size has already been verified. */
request = operation->request->payload;
module_id = request->primary_intf_id;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
module = gb_svc_module_lookup(svc, module_id);
if (!module) {
dev_warn(&svc->dev, "unexpected module-removed event %u\n",
module_id);
return;
}
module->disconnected = true;
gb_module_del(module);
list_del(&module->hd_node);
gb_module_put(module);
}
static void gb_svc_process_intf_oops(struct gb_operation *operation)
{
struct gb_svc_intf_oops_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_interface *intf;
u8 intf_id;
u8 reason;
/* The request message size has already been verified. */
request = operation->request->payload;
intf_id = request->intf_id;
reason = request->reason;
intf = gb_svc_interface_lookup(svc, intf_id);
if (!intf) {
dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
intf_id);
return;
}
dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
intf_id, reason);
mutex_lock(&intf->mutex);
intf->disconnected = true;
gb_interface_disable(intf);
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
}
static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
{
struct gb_svc_intf_mailbox_event_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_interface *intf;
u8 intf_id;
u16 result_code;
u32 mailbox;
/* The request message size has already been verified. */
request = operation->request->payload;
intf_id = request->intf_id;
result_code = le16_to_cpu(request->result_code);
mailbox = le32_to_cpu(request->mailbox);
dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
__func__, intf_id, result_code, mailbox);
intf = gb_svc_interface_lookup(svc, intf_id);
if (!intf) {
dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
return;
}
gb_interface_mailbox_event(intf, result_code, mailbox);
}
static void gb_svc_process_deferred_request(struct work_struct *work)
{
struct gb_svc_deferred_request *dr;
struct gb_operation *operation;
struct gb_svc *svc;
u8 type;
dr = container_of(work, struct gb_svc_deferred_request, work);
operation = dr->operation;
svc = gb_connection_get_data(operation->connection);
type = operation->request->header->type;
switch (type) {
case GB_SVC_TYPE_SVC_HELLO:
gb_svc_process_hello_deferred(operation);
break;
case GB_SVC_TYPE_MODULE_INSERTED:
gb_svc_process_module_inserted(operation);
break;
case GB_SVC_TYPE_MODULE_REMOVED:
gb_svc_process_module_removed(operation);
break;
case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
gb_svc_process_intf_mailbox_event(operation);
break;
case GB_SVC_TYPE_INTF_OOPS:
gb_svc_process_intf_oops(operation);
break;
default:
dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
}
gb_operation_put(operation);
kfree(dr);
}
static int gb_svc_queue_deferred_request(struct gb_operation *operation)
{
struct gb_svc *svc = gb_connection_get_data(operation->connection);
struct gb_svc_deferred_request *dr;
dr = kmalloc(sizeof(*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
gb_operation_get(operation);
dr->operation = operation;
INIT_WORK(&dr->work, gb_svc_process_deferred_request);
queue_work(svc->wq, &dr->work);
return 0;
}
static int gb_svc_intf_reset_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_message *request = op->request;
struct gb_svc_intf_reset_request *reset;
if (request->payload_size < sizeof(*reset)) {
dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
request->payload_size, sizeof(*reset));
return -EINVAL;
}
reset = request->payload;
/* FIXME Reset the interface here */
return 0;
}
static int gb_svc_module_inserted_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_svc_module_inserted_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
request->primary_intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_module_removed_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_svc_module_removed_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
request->primary_intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_intf_oops_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_svc_intf_oops_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_svc_intf_mailbox_event_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_request_handler(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
u8 type = op->type;
int ret = 0;
/*
* SVC requests need to follow a specific order (at least initially) and
* below code takes care of enforcing that. The expected order is:
* - PROTOCOL_VERSION
* - SVC_HELLO
* - Any other request, but the earlier two.
*
* Incoming requests are guaranteed to be serialized and so we don't
* need to protect 'state' for any races.
*/
switch (type) {
case GB_SVC_TYPE_PROTOCOL_VERSION:
if (svc->state != GB_SVC_STATE_RESET)
ret = -EINVAL;
break;
case GB_SVC_TYPE_SVC_HELLO:
if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
ret = -EINVAL;
break;
default:
if (svc->state != GB_SVC_STATE_SVC_HELLO)
ret = -EINVAL;
break;
}
if (ret) {
dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
type, svc->state);
return ret;
}
switch (type) {
case GB_SVC_TYPE_PROTOCOL_VERSION:
ret = gb_svc_version_request(op);
if (!ret)
svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
return ret;
case GB_SVC_TYPE_SVC_HELLO:
ret = gb_svc_hello(op);
if (!ret)
svc->state = GB_SVC_STATE_SVC_HELLO;
return ret;
case GB_SVC_TYPE_INTF_RESET:
return gb_svc_intf_reset_recv(op);
case GB_SVC_TYPE_MODULE_INSERTED:
return gb_svc_module_inserted_recv(op);
case GB_SVC_TYPE_MODULE_REMOVED:
return gb_svc_module_removed_recv(op);
case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
return gb_svc_intf_mailbox_event_recv(op);
case GB_SVC_TYPE_INTF_OOPS:
return gb_svc_intf_oops_recv(op);
default:
dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
return -EINVAL;
}
}
static void gb_svc_release(struct device *dev)
{
struct gb_svc *svc = to_gb_svc(dev);
if (svc->connection)
gb_connection_destroy(svc->connection);
ida_destroy(&svc->device_id_map);
destroy_workqueue(svc->wq);
kfree(svc);
}
const struct device_type greybus_svc_type = {
.name = "greybus_svc",
.release = gb_svc_release,
};
struct gb_svc *gb_svc_create(struct gb_host_device *hd)
{
struct gb_svc *svc;
svc = kzalloc(sizeof(*svc), GFP_KERNEL);
if (!svc)
return NULL;
svc->wq = alloc_ordered_workqueue("%s:svc", 0, dev_name(&hd->dev));
if (!svc->wq) {
kfree(svc);
return NULL;
}
svc->dev.parent = &hd->dev;
svc->dev.bus = &greybus_bus_type;
svc->dev.type = &greybus_svc_type;
svc->dev.groups = svc_groups;
svc->dev.dma_mask = svc->dev.parent->dma_mask;
device_initialize(&svc->dev);
dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
ida_init(&svc->device_id_map);
svc->state = GB_SVC_STATE_RESET;
svc->hd = hd;
svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
gb_svc_request_handler);
if (IS_ERR(svc->connection)) {
dev_err(&svc->dev, "failed to create connection: %ld\n",
PTR_ERR(svc->connection));
goto err_put_device;
}
gb_connection_set_data(svc->connection, svc);
return svc;
err_put_device:
put_device(&svc->dev);
return NULL;
}
int gb_svc_add(struct gb_svc *svc)
{
int ret;
/*
* The SVC protocol is currently driven by the SVC, so the SVC device
* is added from the connection request handler when enough
* information has been received.
*/
ret = gb_connection_enable(svc->connection);
if (ret)
return ret;
return 0;
}
static void gb_svc_remove_modules(struct gb_svc *svc)
{
struct gb_host_device *hd = svc->hd;
struct gb_module *module, *tmp;
list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
gb_module_del(module);
list_del(&module->hd_node);
gb_module_put(module);
}
}
void gb_svc_del(struct gb_svc *svc)
{
gb_connection_disable_rx(svc->connection);
/*
* The SVC device may have been registered from the request handler.
*/
if (device_is_registered(&svc->dev)) {
gb_svc_debugfs_exit(svc);
gb_svc_watchdog_destroy(svc);
device_del(&svc->dev);
}
flush_workqueue(svc->wq);
gb_svc_remove_modules(svc);
gb_connection_disable(svc->connection);
}
void gb_svc_put(struct gb_svc *svc)
{
put_device(&svc->dev);
}
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