1// SPDX-License-Identifier: GPL-2.0
  2
  3/* Copyright (C) 2021-2022 Linaro Ltd. */
  4
  5#include <linux/kernel.h>
  6#include <linux/types.h>
  7#include <linux/device.h>
  8#include <linux/sysfs.h>
  9
 10#include "ipa.h"
 11#include "ipa_version.h"
 12#include "ipa_sysfs.h"
 13
 14static const char *ipa_version_string(struct ipa *ipa)
 15{
 16	switch (ipa->version) {
 17	case IPA_VERSION_3_0:
 18		return "3.0";
 19	case IPA_VERSION_3_1:
 20		return "3.1";
 21	case IPA_VERSION_3_5:
 22		return "3.5";
 23	case IPA_VERSION_3_5_1:
 24		return "3.5.1";
 25	case IPA_VERSION_4_0:
 26		return "4.0";
 27	case IPA_VERSION_4_1:
 28		return "4.1";
 29	case IPA_VERSION_4_2:
 30		return "4.2";
 31	case IPA_VERSION_4_5:
 32		return "4.5";
 33	case IPA_VERSION_4_7:
 34		return "4.7";
 35	case IPA_VERSION_4_9:
 36		return "4.9";
 37	case IPA_VERSION_4_11:
 38		return "4.11";
 39	case IPA_VERSION_5_0:
 40		return "5.0";
 41	default:
 42		return "0.0";	/* Won't happen (checked at probe time) */
 43	}
 44}
 45
 46static ssize_t
 47version_show(struct device *dev, struct device_attribute *attr, char *buf)
 48{
 49	struct ipa *ipa = dev_get_drvdata(dev);
 50
 51	return sysfs_emit(buf, "%s\n", ipa_version_string(ipa));
 52}
 53
 54static DEVICE_ATTR_RO(version);
 55
 56static struct attribute *ipa_attrs[] = {
 57	&dev_attr_version.attr,
 58	NULL
 59};
 60
 61const struct attribute_group ipa_attribute_group = {
 62	.attrs		= ipa_attrs,
 63};
 64
 65static const char *ipa_offload_string(struct ipa *ipa)
 66{
 67	return ipa->version < IPA_VERSION_4_5 ? "MAPv4" : "MAPv5";
 68}
 69
 70static ssize_t rx_offload_show(struct device *dev,
 71			       struct device_attribute *attr, char *buf)
 72{
 73	struct ipa *ipa = dev_get_drvdata(dev);
 74
 75	return sysfs_emit(buf, "%s\n", ipa_offload_string(ipa));
 76}
 77
 78static DEVICE_ATTR_RO(rx_offload);
 79
 80static ssize_t tx_offload_show(struct device *dev,
 81			       struct device_attribute *attr, char *buf)
 82{
 83	struct ipa *ipa = dev_get_drvdata(dev);
 84
 85	return sysfs_emit(buf, "%s\n", ipa_offload_string(ipa));
 86}
 87
 88static DEVICE_ATTR_RO(tx_offload);
 89
 90static struct attribute *ipa_feature_attrs[] = {
 91	&dev_attr_rx_offload.attr,
 92	&dev_attr_tx_offload.attr,
 93	NULL
 94};
 95
 96const struct attribute_group ipa_feature_attribute_group = {
 97	.name		= "feature",
 98	.attrs		= ipa_feature_attrs,
 99};
100
101static umode_t ipa_endpoint_id_is_visible(struct kobject *kobj,
102					  struct attribute *attr, int n)
103{
104	struct ipa *ipa = dev_get_drvdata(kobj_to_dev(kobj));
105	struct device_attribute *dev_attr;
106	struct dev_ext_attribute *ea;
107	bool visible;
108
109	/* An endpoint id attribute is only visible if it's defined */
110	dev_attr = container_of(attr, struct device_attribute, attr);
111	ea = container_of(dev_attr, struct dev_ext_attribute, attr);
112
113	visible = !!ipa->name_map[(enum ipa_endpoint_name)(uintptr_t)ea->var];
114
115	return visible ? attr->mode : 0;
116}
117
118static ssize_t endpoint_id_attr_show(struct device *dev,
119				     struct device_attribute *attr, char *buf)
120{
121	struct ipa *ipa = dev_get_drvdata(dev);
122	struct ipa_endpoint *endpoint;
123	struct dev_ext_attribute *ea;
124
125	ea = container_of(attr, struct dev_ext_attribute, attr);
126	endpoint = ipa->name_map[(enum ipa_endpoint_name)(uintptr_t)ea->var];
127
128	return sysfs_emit(buf, "%u\n", endpoint->endpoint_id);
129}
130
131#define ENDPOINT_ID_ATTR(_n, _endpoint_name)				    \
132	static struct dev_ext_attribute dev_attr_endpoint_id_ ## _n = {	    \
133		.attr	= __ATTR(_n, 0444, endpoint_id_attr_show, NULL),    \
134		.var	= (void *)(_endpoint_name),			    \
135	}
136
137ENDPOINT_ID_ATTR(modem_rx, IPA_ENDPOINT_AP_MODEM_RX);
138ENDPOINT_ID_ATTR(modem_tx, IPA_ENDPOINT_AP_MODEM_TX);
139
140static struct attribute *ipa_endpoint_id_attrs[] = {
141	&dev_attr_endpoint_id_modem_rx.attr.attr,
142	&dev_attr_endpoint_id_modem_tx.attr.attr,
143	NULL
144};
145
146const struct attribute_group ipa_endpoint_id_attribute_group = {
147	.name		= "endpoint_id",
148	.is_visible	= ipa_endpoint_id_is_visible,
149	.attrs		= ipa_endpoint_id_attrs,
150};
151
152/* Reuse endpoint ID attributes for the legacy modem endpoint IDs */
153#define MODEM_ATTR(_n, _endpoint_name)					    \
154	static struct dev_ext_attribute dev_attr_modem_ ## _n = {	    \
155		.attr	= __ATTR(_n, 0444, endpoint_id_attr_show, NULL),    \
156		.var	= (void *)(_endpoint_name),			    \
157	}
158
159MODEM_ATTR(rx_endpoint_id, IPA_ENDPOINT_AP_MODEM_RX);
160MODEM_ATTR(tx_endpoint_id, IPA_ENDPOINT_AP_MODEM_TX);
161
162static struct attribute *ipa_modem_attrs[] = {
163	&dev_attr_modem_rx_endpoint_id.attr.attr,
164	&dev_attr_modem_tx_endpoint_id.attr.attr,
165	NULL,
166};
167
168const struct attribute_group ipa_modem_attribute_group = {
169	.name		= "modem",
170	.attrs		= ipa_modem_attrs,
171};