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// SPDX-License-Identifier: GPL-2.0-only
/*
* Device probe and register.
*
* Copyright (c) 2017-2019, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
* Copyright (c) 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
* Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
* Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
* Copyright (c) 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/mmc/sdio_func.h>
#include <linux/spi/spi.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include "main.h"
#include "wfx.h"
#include "fwio.h"
#include "hwio.h"
#include "bus.h"
#include "bh.h"
#include "sta.h"
#include "debug.h"
#include "secure_link.h"
#include "hif_tx_mib.h"
#include "hif_api_cmd.h"
#include "wfx_version.h"
#define WFX_PDS_MAX_SIZE 1500
MODULE_DESCRIPTION("Silicon Labs 802.11 Wireless LAN driver for WFx");
MODULE_AUTHOR("Jérôme Pouiller <jerome.pouiller@silabs.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(WFX_LABEL);
static int gpio_wakeup = -2;
module_param(gpio_wakeup, int, 0644);
MODULE_PARM_DESC(gpio_wakeup, "gpio number for wakeup. -1 for none.");
static char *slk_key;
module_param(slk_key, charp, 0600);
MODULE_PARM_DESC(slk_key, "secret key for secure link (expect 64 hexdecimal digits).");
static const struct ieee80211_ops wfx_ops = {
.start = wfx_start,
.stop = wfx_stop,
.add_interface = wfx_add_interface,
.remove_interface = wfx_remove_interface,
};
bool wfx_api_older_than(struct wfx_dev *wdev, int major, int minor)
{
if (wdev->hw_caps.api_version_major < major)
return true;
if (wdev->hw_caps.api_version_major > major)
return false;
if (wdev->hw_caps.api_version_minor < minor)
return true;
return false;
}
struct gpio_desc *wfx_get_gpio(struct device *dev, int override, const char *label)
{
struct gpio_desc *ret;
char label_buf[256];
if (override >= 0) {
snprintf(label_buf, sizeof(label_buf), "wfx_%s", label);
ret = ERR_PTR(devm_gpio_request_one(dev, override, GPIOF_OUT_INIT_LOW, label_buf));
if (!ret)
ret = gpio_to_desc(override);
} else if (override == -1) {
ret = NULL;
} else {
ret = devm_gpiod_get(dev, label, GPIOD_OUT_LOW);
}
if (IS_ERR(ret) || !ret) {
if (!ret || PTR_ERR(ret) == -ENOENT)
dev_warn(dev, "gpio %s is not defined\n", label);
else
dev_warn(dev, "error while requesting gpio %s\n", label);
ret = NULL;
} else {
dev_dbg(dev, "using gpio %d for %s\n", desc_to_gpio(ret), label);
}
return ret;
}
static void wfx_fill_sl_key(struct device *dev, struct wfx_platform_data *pdata)
{
const char *ascii_key = NULL;
int ret = 0;
if (slk_key)
ascii_key = slk_key;
if (!ascii_key)
ret = of_property_read_string(dev->of_node, "slk_key", &ascii_key);
if (ret == -EILSEQ || ret == -ENODATA)
dev_err(dev, "ignoring malformatted key from DT\n");
if (!ascii_key)
return;
ret = hex2bin(pdata->slk_key, ascii_key, sizeof(pdata->slk_key));
if (ret) {
dev_err(dev, "ignoring malformatted key: %s\n", ascii_key);
memset(pdata->slk_key, 0, sizeof(pdata->slk_key));
return;
}
dev_err(dev, "secure link is not supported by this driver, ignoring provided key\n");
}
/* NOTE: wfx_send_pds() destroy buf */
int wfx_send_pds(struct wfx_dev *wdev, unsigned char *buf, size_t len)
{
int ret;
int start, brace_level, i;
start = 0;
brace_level = 0;
if (buf[0] != '{') {
dev_err(wdev->dev, "valid PDS start with '{'. Did you forget to compress it?\n");
return -EINVAL;
}
for (i = 1; i < len - 1; i++) {
if (buf[i] == '{')
brace_level++;
if (buf[i] == '}')
brace_level--;
if (buf[i] == '}' && !brace_level) {
i++;
if (i - start + 1 > WFX_PDS_MAX_SIZE)
return -EFBIG;
buf[start] = '{';
buf[i] = 0;
dev_dbg(wdev->dev, "send PDS '%s}'\n", buf + start);
buf[i] = '}';
ret = hif_configuration(wdev, buf + start, i - start + 1);
if (ret == HIF_STATUS_FAILURE) {
dev_err(wdev->dev, "PDS bytes %d to %d: invalid data (unsupported options?)\n", start, i);
return -EINVAL;
}
if (ret == -ETIMEDOUT) {
dev_err(wdev->dev, "PDS bytes %d to %d: chip didn't reply (corrupted file?)\n", start, i);
return ret;
}
if (ret) {
dev_err(wdev->dev, "PDS bytes %d to %d: chip returned an unknown error\n", start, i);
return -EIO;
}
buf[i] = ',';
start = i;
}
}
return 0;
}
static int wfx_send_pdata_pds(struct wfx_dev *wdev)
{
int ret = 0;
const struct firmware *pds;
unsigned char *tmp_buf;
ret = request_firmware(&pds, wdev->pdata.file_pds, wdev->dev);
if (ret) {
dev_err(wdev->dev, "can't load PDS file %s\n", wdev->pdata.file_pds);
return ret;
}
tmp_buf = kmemdup(pds->data, pds->size, GFP_KERNEL);
ret = wfx_send_pds(wdev, tmp_buf, pds->size);
kfree(tmp_buf);
release_firmware(pds);
return ret;
}
struct wfx_dev *wfx_init_common(struct device *dev,
const struct wfx_platform_data *pdata,
const struct hwbus_ops *hwbus_ops,
void *hwbus_priv)
{
struct ieee80211_hw *hw;
struct wfx_dev *wdev;
hw = ieee80211_alloc_hw(sizeof(struct wfx_dev), &wfx_ops);
if (!hw)
return NULL;
SET_IEEE80211_DEV(hw, dev);
hw->vif_data_size = sizeof(struct wfx_vif);
hw->sta_data_size = sizeof(struct wfx_sta_priv);
hw->queues = 4;
hw->max_rates = 8;
hw->max_rate_tries = 15;
hw->extra_tx_headroom = sizeof(struct hif_sl_msg_hdr) + sizeof(struct hif_msg)
+ sizeof(struct hif_req_tx)
+ 4 /* alignment */ + 8 /* TKIP IV */;
wdev = hw->priv;
wdev->hw = hw;
wdev->dev = dev;
wdev->hwbus_ops = hwbus_ops;
wdev->hwbus_priv = hwbus_priv;
memcpy(&wdev->pdata, pdata, sizeof(*pdata));
of_property_read_string(dev->of_node, "config-file", &wdev->pdata.file_pds);
wdev->pdata.gpio_wakeup = wfx_get_gpio(dev, gpio_wakeup, "wakeup");
wfx_fill_sl_key(dev, &wdev->pdata);
init_completion(&wdev->firmware_ready);
wfx_init_hif_cmd(&wdev->hif_cmd);
return wdev;
}
void wfx_free_common(struct wfx_dev *wdev)
{
ieee80211_free_hw(wdev->hw);
}
int wfx_probe(struct wfx_dev *wdev)
{
int i;
int err;
const void *macaddr;
struct gpio_desc *gpio_saved;
// During first part of boot, gpio_wakeup cannot yet been used. So
// prevent bh() to touch it.
gpio_saved = wdev->pdata.gpio_wakeup;
wdev->pdata.gpio_wakeup = NULL;
wfx_bh_register(wdev);
err = wfx_init_device(wdev);
if (err)
goto err1;
err = wait_for_completion_interruptible_timeout(&wdev->firmware_ready, 10 * HZ);
if (err <= 0) {
if (err == 0) {
dev_err(wdev->dev, "timeout while waiting for startup indication. IRQ configuration error?\n");
err = -ETIMEDOUT;
} else if (err == -ERESTARTSYS) {
dev_info(wdev->dev, "probe interrupted by user\n");
}
goto err1;
}
// FIXME: fill wiphy::hw_version
dev_info(wdev->dev, "started firmware %d.%d.%d \"%s\" (API: %d.%d, keyset: %02X, caps: 0x%.8X)\n",
wdev->hw_caps.firmware_major, wdev->hw_caps.firmware_minor,
wdev->hw_caps.firmware_build, wdev->hw_caps.firmware_label,
wdev->hw_caps.api_version_major, wdev->hw_caps.api_version_minor,
wdev->keyset, *((u32 *) &wdev->hw_caps.capabilities));
snprintf(wdev->hw->wiphy->fw_version, sizeof(wdev->hw->wiphy->fw_version),
"%d.%d.%d",
wdev->hw_caps.firmware_major,
wdev->hw_caps.firmware_minor,
wdev->hw_caps.firmware_build);
if (wfx_api_older_than(wdev, 1, 0)) {
dev_err(wdev->dev, "unsupported firmware API version (expect 1 while firmware returns %d)\n",
wdev->hw_caps.api_version_major);
err = -ENOTSUPP;
goto err1;
}
err = wfx_sl_init(wdev);
if (err && wdev->hw_caps.capabilities.link_mode == SEC_LINK_ENFORCED) {
dev_err(wdev->dev, "chip require secure_link, but can't negociate it\n");
goto err1;
}
dev_dbg(wdev->dev, "sending configuration file %s\n", wdev->pdata.file_pds);
err = wfx_send_pdata_pds(wdev);
if (err < 0)
goto err1;
wdev->pdata.gpio_wakeup = gpio_saved;
if (wdev->pdata.gpio_wakeup) {
dev_dbg(wdev->dev, "enable 'quiescent' power mode with gpio %d and PDS file %s\n",
desc_to_gpio(wdev->pdata.gpio_wakeup), wdev->pdata.file_pds);
gpiod_set_value(wdev->pdata.gpio_wakeup, 1);
control_reg_write(wdev, 0);
hif_set_operational_mode(wdev, HIF_OP_POWER_MODE_QUIESCENT);
} else {
hif_set_operational_mode(wdev, HIF_OP_POWER_MODE_DOZE);
}
hif_use_multi_tx_conf(wdev, true);
for (i = 0; i < ARRAY_SIZE(wdev->addresses); i++) {
eth_zero_addr(wdev->addresses[i].addr);
macaddr = of_get_mac_address(wdev->dev->of_node);
if (macaddr) {
ether_addr_copy(wdev->addresses[i].addr, macaddr);
wdev->addresses[i].addr[ETH_ALEN - 1] += i;
}
ether_addr_copy(wdev->addresses[i].addr, wdev->hw_caps.mac_addr[i]);
if (!is_valid_ether_addr(wdev->addresses[i].addr)) {
dev_warn(wdev->dev, "using random MAC address\n");
eth_random_addr(wdev->addresses[i].addr);
}
dev_info(wdev->dev, "MAC address %d: %pM\n", i, wdev->addresses[i].addr);
}
err = wfx_debug_init(wdev);
if (err)
goto err2;
return 0;
err2:
ieee80211_free_hw(wdev->hw);
err1:
wfx_bh_unregister(wdev);
return err;
}
void wfx_release(struct wfx_dev *wdev)
{
hif_shutdown(wdev);
wfx_bh_unregister(wdev);
wfx_sl_deinit(wdev);
}
static int __init wfx_core_init(void)
{
int ret = 0;
pr_info("wfx: Silicon Labs " WFX_LABEL "\n");
if (IS_ENABLED(CONFIG_SPI))
ret = spi_register_driver(&wfx_spi_driver);
if (IS_ENABLED(CONFIG_MMC) && !ret)
ret = sdio_register_driver(&wfx_sdio_driver);
return ret;
}
module_init(wfx_core_init);
static void __exit wfx_core_exit(void)
{
if (IS_ENABLED(CONFIG_MMC))
sdio_unregister_driver(&wfx_sdio_driver);
if (IS_ENABLED(CONFIG_SPI))
spi_unregister_driver(&wfx_spi_driver);
}
module_exit(wfx_core_exit);
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