// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of wlcore
 *
 * Copyright (C) 2013 Texas Instruments Inc.
 */

#include <linux/pm_runtime.h>

#include "acx.h"
#include "wlcore.h"
#include "debug.h"
#include "sysfs.h"

static ssize_t bt_coex_state_show(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
{
        struct wl1271 *wl = dev_get_drvdata(dev);
        ssize_t len;

        mutex_lock(&wl->mutex);
        len = sysfs_emit(buf, "%d\n\n0 - off\n1 - on\n", wl->sg_enabled);
        mutex_unlock(&wl->mutex);

        return len;

}

static ssize_t bt_coex_state_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
{
        struct wl1271 *wl = dev_get_drvdata(dev);
        unsigned long res;
        int ret;

        ret = kstrtoul(buf, 10, &res);
        if (ret < 0) {
                wl1271_warning("incorrect value written to bt_coex_mode");
                return count;
        }

        mutex_lock(&wl->mutex);

        res = !!res;

        if (res == wl->sg_enabled)
                goto out;

        wl->sg_enabled = res;

        if (unlikely(wl->state != WLCORE_STATE_ON))
                goto out;

        ret = pm_runtime_resume_and_get(wl->dev);
        if (ret < 0)
                goto out;

        wl1271_acx_sg_enable(wl, wl->sg_enabled);
        pm_runtime_put_autosuspend(wl->dev);

 out:
        mutex_unlock(&wl->mutex);
        return count;
}

static DEVICE_ATTR_RW(bt_coex_state);

static ssize_t hw_pg_ver_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        struct wl1271 *wl = dev_get_drvdata(dev);
        ssize_t len;

        mutex_lock(&wl->mutex);
        if (wl->hw_pg_ver >= 0)
                len = sysfs_emit(buf, "%d\n", wl->hw_pg_ver);
        else
                len = sysfs_emit(buf, "n/a\n");
        mutex_unlock(&wl->mutex);

        return len;
}

static DEVICE_ATTR_RO(hw_pg_ver);

static ssize_t wl1271_sysfs_read_fwlog(struct file *filp, struct kobject *kobj,
                                       const struct bin_attribute *bin_attr,
                                       char *buffer, loff_t pos, size_t count)
{
        struct device *dev = kobj_to_dev(kobj);
        struct wl1271 *wl = dev_get_drvdata(dev);
        ssize_t len;
        int ret;

        ret = mutex_lock_interruptible(&wl->mutex);
        if (ret < 0)
                return -ERESTARTSYS;

        /* Check if the fwlog is still valid */
        if (wl->fwlog_size < 0) {
                mutex_unlock(&wl->mutex);
                return 0;
        }

        /* Seeking is not supported - old logs are not kept. Disregard pos. */
        len = min_t(size_t, count, wl->fwlog_size);
        wl->fwlog_size -= len;
        memcpy(buffer, wl->fwlog, len);

        /* Make room for new messages */
        memmove(wl->fwlog, wl->fwlog + len, wl->fwlog_size);

        mutex_unlock(&wl->mutex);

        return len;
}

static const struct bin_attribute fwlog_attr = {
        .attr = { .name = "fwlog", .mode = 0400 },
        .read = wl1271_sysfs_read_fwlog,
};

int wlcore_sysfs_init(struct wl1271 *wl)
{
        int ret;

        /* Create sysfs file to control bt coex state */
        ret = device_create_file(wl->dev, &dev_attr_bt_coex_state);
        if (ret < 0) {
                wl1271_error("failed to create sysfs file bt_coex_state");
                goto out;
        }

        /* Create sysfs file to get HW PG version */
        ret = device_create_file(wl->dev, &dev_attr_hw_pg_ver);
        if (ret < 0) {
                wl1271_error("failed to create sysfs file hw_pg_ver");
                goto out_bt_coex_state;
        }

        /* Create sysfs file for the FW log */
        ret = device_create_bin_file(wl->dev, &fwlog_attr);
        if (ret < 0) {
                wl1271_error("failed to create sysfs file fwlog");
                goto out_hw_pg_ver;
        }

        goto out;

out_hw_pg_ver:
        device_remove_file(wl->dev, &dev_attr_hw_pg_ver);

out_bt_coex_state:
        device_remove_file(wl->dev, &dev_attr_bt_coex_state);

out:
        return ret;
}

void wlcore_sysfs_free(struct wl1271 *wl)
{
        device_remove_bin_file(wl->dev, &fwlog_attr);

        device_remove_file(wl->dev, &dev_attr_hw_pg_ver);

        device_remove_file(wl->dev, &dev_attr_bt_coex_state);
}