1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * This file is part of wlcore
  4 *
  5 * Copyright (C) 2013 Texas Instruments Inc.
  6 */
  7
  8#include <linux/pm_runtime.h>
  9
 10#include "acx.h"
 11#include "wlcore.h"
 12#include "debug.h"
 13#include "sysfs.h"
 14
 15static ssize_t bt_coex_state_show(struct device *dev,
 16				  struct device_attribute *attr,
 17				  char *buf)
 18{
 19	struct wl1271 *wl = dev_get_drvdata(dev);
 20	ssize_t len;
 21
 22	len = PAGE_SIZE;
 23
 24	mutex_lock(&wl->mutex);
 25	len = snprintf(buf, len, "%d\n\n0 - off\n1 - on\n",
 26		       wl->sg_enabled);
 27	mutex_unlock(&wl->mutex);
 28
 29	return len;
 30
 31}
 32
 33static ssize_t bt_coex_state_store(struct device *dev,
 34				   struct device_attribute *attr,
 35				   const char *buf, size_t count)
 36{
 37	struct wl1271 *wl = dev_get_drvdata(dev);
 38	unsigned long res;
 39	int ret;
 40
 41	ret = kstrtoul(buf, 10, &res);
 42	if (ret < 0) {
 43		wl1271_warning("incorrect value written to bt_coex_mode");
 44		return count;
 45	}
 46
 47	mutex_lock(&wl->mutex);
 48
 49	res = !!res;
 50
 51	if (res == wl->sg_enabled)
 52		goto out;
 53
 54	wl->sg_enabled = res;
 55
 56	if (unlikely(wl->state != WLCORE_STATE_ON))
 57		goto out;
 58
 59	ret = pm_runtime_resume_and_get(wl->dev);
 60	if (ret < 0)
 61		goto out;
 62
 63	wl1271_acx_sg_enable(wl, wl->sg_enabled);
 64	pm_runtime_mark_last_busy(wl->dev);
 65	pm_runtime_put_autosuspend(wl->dev);
 66
 67 out:
 68	mutex_unlock(&wl->mutex);
 69	return count;
 70}
 71
 72static DEVICE_ATTR_RW(bt_coex_state);
 73
 74static ssize_t hw_pg_ver_show(struct device *dev,
 75			      struct device_attribute *attr,
 76			      char *buf)
 77{
 78	struct wl1271 *wl = dev_get_drvdata(dev);
 79	ssize_t len;
 80
 81	len = PAGE_SIZE;
 82
 83	mutex_lock(&wl->mutex);
 84	if (wl->hw_pg_ver >= 0)
 85		len = snprintf(buf, len, "%d\n", wl->hw_pg_ver);
 86	else
 87		len = snprintf(buf, len, "n/a\n");
 88	mutex_unlock(&wl->mutex);
 89
 90	return len;
 91}
 92
 93static DEVICE_ATTR_RO(hw_pg_ver);
 94
 95static ssize_t wl1271_sysfs_read_fwlog(struct file *filp, struct kobject *kobj,
 96				       struct bin_attribute *bin_attr,
 97				       char *buffer, loff_t pos, size_t count)
 98{
 99	struct device *dev = kobj_to_dev(kobj);
100	struct wl1271 *wl = dev_get_drvdata(dev);
101	ssize_t len;
102	int ret;
103
104	ret = mutex_lock_interruptible(&wl->mutex);
105	if (ret < 0)
106		return -ERESTARTSYS;
107
108	/* Check if the fwlog is still valid */
109	if (wl->fwlog_size < 0) {
110		mutex_unlock(&wl->mutex);
111		return 0;
112	}
113
114	/* Seeking is not supported - old logs are not kept. Disregard pos. */
115	len = min_t(size_t, count, wl->fwlog_size);
116	wl->fwlog_size -= len;
117	memcpy(buffer, wl->fwlog, len);
118
119	/* Make room for new messages */
120	memmove(wl->fwlog, wl->fwlog + len, wl->fwlog_size);
121
122	mutex_unlock(&wl->mutex);
123
124	return len;
125}
126
127static const struct bin_attribute fwlog_attr = {
128	.attr = { .name = "fwlog", .mode = 0400 },
129	.read = wl1271_sysfs_read_fwlog,
130};
131
132int wlcore_sysfs_init(struct wl1271 *wl)
133{
134	int ret;
135
136	/* Create sysfs file to control bt coex state */
137	ret = device_create_file(wl->dev, &dev_attr_bt_coex_state);
138	if (ret < 0) {
139		wl1271_error("failed to create sysfs file bt_coex_state");
140		goto out;
141	}
142
143	/* Create sysfs file to get HW PG version */
144	ret = device_create_file(wl->dev, &dev_attr_hw_pg_ver);
145	if (ret < 0) {
146		wl1271_error("failed to create sysfs file hw_pg_ver");
147		goto out_bt_coex_state;
148	}
149
150	/* Create sysfs file for the FW log */
151	ret = device_create_bin_file(wl->dev, &fwlog_attr);
152	if (ret < 0) {
153		wl1271_error("failed to create sysfs file fwlog");
154		goto out_hw_pg_ver;
155	}
156
157	goto out;
158
159out_hw_pg_ver:
160	device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
161
162out_bt_coex_state:
163	device_remove_file(wl->dev, &dev_attr_bt_coex_state);
164
165out:
166	return ret;
167}
168
169void wlcore_sysfs_free(struct wl1271 *wl)
170{
171	device_remove_bin_file(wl->dev, &fwlog_attr);
172
173	device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
174
175	device_remove_file(wl->dev, &dev_attr_bt_coex_state);
176}