drivers/net/wireless/ti/wlcore/sysfs.c

   1 /*
   2  * This file is part of wlcore
   3  *
   4  * Copyright (C) 2013 Texas Instruments Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include <linux/pm_runtime.h>
  23
  24 #include "acx.h"
  25 #include "wlcore.h"
  26 #include "debug.h"
  27 #include "sysfs.h"
  28
  29 static ssize_t wl1271_sysfs_show_bt_coex_state(struct device *dev,
  30                                                struct device_attribute *attr,
  31                                                char *buf)
  32 {
  33         struct wl1271 *wl = dev_get_drvdata(dev);
  34         ssize_t len;
  35
  36         len = PAGE_SIZE;
  37
  38         mutex_lock(&wl->mutex);
  39         len = snprintf(buf, len, "%d\n\n0 - off\n1 - on\n",
  40                        wl->sg_enabled);
  41         mutex_unlock(&wl->mutex);
  42
  43         return len;
  44
  45 }
  46
  47 static ssize_t wl1271_sysfs_store_bt_coex_state(struct device *dev,
  48                                                 struct device_attribute *attr,
  49                                                 const char *buf, size_t count)
  50 {
  51         struct wl1271 *wl = dev_get_drvdata(dev);
  52         unsigned long res;
  53         int ret;
  54
  55         ret = kstrtoul(buf, 10, &res);
  56         if (ret < 0) {
  57                 wl1271_warning("incorrect value written to bt_coex_mode");
  58                 return count;
  59         }
  60
  61         mutex_lock(&wl->mutex);
  62
  63         res = !!res;
  64
  65         if (res == wl->sg_enabled)
  66                 goto out;
  67
  68         wl->sg_enabled = res;
  69
  70         if (unlikely(wl->state != WLCORE_STATE_ON))
  71                 goto out;
  72
  73         ret = pm_runtime_get_sync(wl->dev);
  74         if (ret < 0) {
  75                 pm_runtime_put_noidle(wl->dev);
  76                 goto out;
  77         }
  78
  79         wl1271_acx_sg_enable(wl, wl->sg_enabled);
  80         pm_runtime_mark_last_busy(wl->dev);
  81         pm_runtime_put_autosuspend(wl->dev);
  82
  83  out:
  84         mutex_unlock(&wl->mutex);
  85         return count;
  86 }
  87
  88 static DEVICE_ATTR(bt_coex_state, 0644,
  89                    wl1271_sysfs_show_bt_coex_state,
  90                    wl1271_sysfs_store_bt_coex_state);
  91
  92 static ssize_t wl1271_sysfs_show_hw_pg_ver(struct device *dev,
  93                                            struct device_attribute *attr,
  94                                            char *buf)
  95 {
  96         struct wl1271 *wl = dev_get_drvdata(dev);
  97         ssize_t len;
  98
  99         len = PAGE_SIZE;
 100
 101         mutex_lock(&wl->mutex);
 102         if (wl->hw_pg_ver >= 0)
 103                 len = snprintf(buf, len, "%d\n", wl->hw_pg_ver);
 104         else
 105                 len = snprintf(buf, len, "n/a\n");
 106         mutex_unlock(&wl->mutex);
 107
 108         return len;
 109 }
 110
 111 static DEVICE_ATTR(hw_pg_ver, 0444, wl1271_sysfs_show_hw_pg_ver, NULL);
 112
 113 static ssize_t wl1271_sysfs_read_fwlog(struct file *filp, struct kobject *kobj,
 114                                        struct bin_attribute *bin_attr,
 115                                        char *buffer, loff_t pos, size_t count)
 116 {
 117         struct device *dev = container_of(kobj, struct device, kobj);
 118         struct wl1271 *wl = dev_get_drvdata(dev);
 119         ssize_t len;
 120         int ret;
 121
 122         ret = mutex_lock_interruptible(&wl->mutex);
 123         if (ret < 0)
 124                 return -ERESTARTSYS;
 125
 126         /* Check if the fwlog is still valid */
 127         if (wl->fwlog_size < 0) {
 128                 mutex_unlock(&wl->mutex);
 129                 return 0;
 130         }
 131
 132         /* Seeking is not supported - old logs are not kept. Disregard pos. */
 133         len = min_t(size_t, count, wl->fwlog_size);
 134         wl->fwlog_size -= len;
 135         memcpy(buffer, wl->fwlog, len);
 136
 137         /* Make room for new messages */
 138         memmove(wl->fwlog, wl->fwlog + len, wl->fwlog_size);
 139
 140         mutex_unlock(&wl->mutex);
 141
 142         return len;
 143 }
 144
 145 static const struct bin_attribute fwlog_attr = {
 146         .attr = { .name = "fwlog", .mode = 0400 },
 147         .read = wl1271_sysfs_read_fwlog,
 148 };
 149
 150 int wlcore_sysfs_init(struct wl1271 *wl)
 151 {
 152         int ret;
 153
 154         /* Create sysfs file to control bt coex state */
 155         ret = device_create_file(wl->dev, &dev_attr_bt_coex_state);
 156         if (ret < 0) {
 157                 wl1271_error("failed to create sysfs file bt_coex_state");
 158                 goto out;
 159         }
 160
 161         /* Create sysfs file to get HW PG version */
 162         ret = device_create_file(wl->dev, &dev_attr_hw_pg_ver);
 163         if (ret < 0) {
 164                 wl1271_error("failed to create sysfs file hw_pg_ver");
 165                 goto out_bt_coex_state;
 166         }
 167
 168         /* Create sysfs file for the FW log */
 169         ret = device_create_bin_file(wl->dev, &fwlog_attr);
 170         if (ret < 0) {
 171                 wl1271_error("failed to create sysfs file fwlog");
 172                 goto out_hw_pg_ver;
 173         }
 174
 175         goto out;
 176
 177 out_hw_pg_ver:
 178         device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
 179
 180 out_bt_coex_state:
 181         device_remove_file(wl->dev, &dev_attr_bt_coex_state);
 182
 183 out:
 184         return ret;
 185 }
 186
 187 void wlcore_sysfs_free(struct wl1271 *wl)
 188 {
 189         device_remove_bin_file(wl->dev, &fwlog_attr);
 190
 191         device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
 192
 193         device_remove_file(wl->dev, &dev_attr_bt_coex_state);
 194 }