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Subject[PATCH 03/16] wl1251: add sysfs interface for bluetooth coexistence mode configuration
Date
From: David Gnedt <david.gnedt@davizone.at>

Port the bt_coex_mode sysfs interface from wl1251 driver version included
in the Maemo Fremantle kernel to allow bt-coexistence mode configuration.
This enables userspace applications to set one of the modes
WL1251_BT_COEX_OFF, WL1251_BT_COEX_ENABLE and WL1251_BT_COEX_MONOAUDIO.
The default mode is WL1251_BT_COEX_OFF.
It should be noted that this driver always enabled bt-coexistence before
and enabled bt-coexistence directly affects the receiving performance,
rendering it unusable in some low-signal situations. Especially monitor
mode is affected very badly with bt-coexistence enabled.

Signed-off-by: David Gnedt <david.gnedt@davizone.at>
---
drivers/net/wireless/ti/wl1251/acx.c | 43 ++++++++++--
drivers/net/wireless/ti/wl1251/acx.h | 8 ++-
drivers/net/wireless/ti/wl1251/init.c | 6 +-
drivers/net/wireless/ti/wl1251/main.c | 108 +++++++++++++++++++++++++++++++
drivers/net/wireless/ti/wl1251/wl1251.h | 8 +++
5 files changed, 161 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/ti/wl1251/acx.c b/drivers/net/wireless/ti/wl1251/acx.c
index db6430c..cce50e2 100644
--- a/drivers/net/wireless/ti/wl1251/acx.c
+++ b/drivers/net/wireless/ti/wl1251/acx.c
@@ -581,7 +581,7 @@ out:
return ret;
}

-int wl1251_acx_sg_enable(struct wl1251 *wl)
+int wl1251_acx_sg_enable(struct wl1251 *wl, u8 mode)
{
struct acx_bt_wlan_coex *pta;
int ret;
@@ -594,7 +594,7 @@ int wl1251_acx_sg_enable(struct wl1251 *wl)
goto out;
}

- pta->enable = SG_ENABLE;
+ pta->enable = mode;

ret = wl1251_cmd_configure(wl, ACX_SG_ENABLE, pta, sizeof(*pta));
if (ret < 0) {
@@ -607,7 +607,7 @@ out:
return ret;
}

-int wl1251_acx_sg_cfg(struct wl1251 *wl)
+int wl1251_acx_sg_cfg(struct wl1251 *wl, u16 wake_up_beacon)
{
struct acx_bt_wlan_coex_param *param;
int ret;
@@ -632,7 +632,7 @@ int wl1251_acx_sg_cfg(struct wl1251 *wl)
param->wlan_cycle_fast = PTA_CYCLE_TIME_FAST_DEF;
param->bt_anti_starvation_period = PTA_ANTI_STARVE_PERIOD_DEF;
param->next_bt_lp_packet = PTA_TIMEOUT_NEXT_BT_LP_PACKET_DEF;
- param->wake_up_beacon = PTA_TIME_BEFORE_BEACON_DEF;
+ param->wake_up_beacon = wake_up_beacon;
param->hp_dm_max_guard_time = PTA_HPDM_MAX_TIME_DEF;
param->next_wlan_packet = PTA_TIME_OUT_NEXT_WLAN_DEF;
param->antenna_type = PTA_ANTENNA_TYPE_DEF;
@@ -661,6 +661,41 @@ out:
return ret;
}

+int wl1251_acx_sg_configure(struct wl1251 *wl, bool force)
+{
+ int ret;
+
+ if (wl->state == WL1251_STATE_OFF && !force)
+ return 0;
+
+ switch (wl->bt_coex_mode) {
+ case WL1251_BT_COEX_OFF:
+ ret = wl1251_acx_sg_enable(wl, SG_DISABLE);
+ if (ret)
+ break;
+ ret = wl1251_acx_sg_cfg(wl, 0);
+ break;
+ case WL1251_BT_COEX_ENABLE:
+ ret = wl1251_acx_sg_enable(wl, SG_ENABLE);
+ if (ret)
+ break;
+ ret = wl1251_acx_sg_cfg(wl, PTA_TIME_BEFORE_BEACON_DEF);
+ break;
+ case WL1251_BT_COEX_MONOAUDIO:
+ ret = wl1251_acx_sg_enable(wl, SG_ENABLE);
+ if (ret)
+ break;
+ ret = wl1251_acx_sg_cfg(wl, PTA_TIME_BEFORE_BEACON_MONO_AUDIO);
+ break;
+ default:
+ wl1251_error("Invalid BT co-ex mode!");
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
int wl1251_acx_cca_threshold(struct wl1251 *wl)
{
struct acx_energy_detection *detection;
diff --git a/drivers/net/wireless/ti/wl1251/acx.h b/drivers/net/wireless/ti/wl1251/acx.h
index c2ba100..99ea80e 100644
--- a/drivers/net/wireless/ti/wl1251/acx.h
+++ b/drivers/net/wireless/ti/wl1251/acx.h
@@ -558,7 +558,8 @@ struct acx_bt_wlan_coex {
#define PTA_ANTI_STARVE_PERIOD_DEF (500)
#define PTA_ANTI_STARVE_NUM_CYCLE_DEF (4)
#define PTA_ALLOW_PA_SD_DEF (1)
-#define PTA_TIME_BEFORE_BEACON_DEF (6300)
+#define PTA_TIME_BEFORE_BEACON_DEF (500)
+#define PTA_TIME_BEFORE_BEACON_MONO_AUDIO (6300)
#define PTA_HPDM_MAX_TIME_DEF (1600)
#define PTA_TIME_OUT_NEXT_WLAN_DEF (2550)
#define PTA_AUTO_MODE_NO_CTS_DEF (0)
@@ -1455,8 +1456,9 @@ int wl1251_acx_rts_threshold(struct wl1251 *wl, u16 rts_threshold);
int wl1251_acx_beacon_filter_opt(struct wl1251 *wl, bool enable_filter);
int wl1251_acx_beacon_filter_table(struct wl1251 *wl);
int wl1251_acx_conn_monit_params(struct wl1251 *wl);
-int wl1251_acx_sg_enable(struct wl1251 *wl);
-int wl1251_acx_sg_cfg(struct wl1251 *wl);
+int wl1251_acx_sg_enable(struct wl1251 *wl, u8 mode);
+int wl1251_acx_sg_cfg(struct wl1251 *wl, u16 wake_up_beacon);
+int wl1251_acx_sg_configure(struct wl1251 *wl, bool force);
int wl1251_acx_cca_threshold(struct wl1251 *wl);
int wl1251_acx_bcn_dtim_options(struct wl1251 *wl);
int wl1251_acx_aid(struct wl1251 *wl, u16 aid);
diff --git a/drivers/net/wireless/ti/wl1251/init.c b/drivers/net/wireless/ti/wl1251/init.c
index 89b43d3..a6ad223 100644
--- a/drivers/net/wireless/ti/wl1251/init.c
+++ b/drivers/net/wireless/ti/wl1251/init.c
@@ -162,11 +162,7 @@ int wl1251_hw_init_pta(struct wl1251 *wl)
{
int ret;

- ret = wl1251_acx_sg_enable(wl);
- if (ret < 0)
- return ret;
-
- ret = wl1251_acx_sg_cfg(wl);
+ ret = wl1251_acx_sg_configure(wl, true);
if (ret < 0)
return ret;

diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index 4d89ac8..ad2fd18 100644
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/drivers/net/wireless/ti/wl1251/main.c
@@ -27,6 +27,7 @@
#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/vmalloc.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>

#include "wl1251.h"
@@ -1256,6 +1257,94 @@ static const struct ieee80211_ops wl1251_ops = {
.get_survey = wl1251_op_get_survey,
};

+static ssize_t wl1251_sysfs_show_bt_coex_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct wl1251 *wl = dev_get_drvdata(dev);
+ ssize_t len;
+
+ /* FIXME: what's the maximum length of buf? page size?*/
+ len = 500;
+
+ mutex_lock(&wl->mutex);
+ len = snprintf(buf, len, "%d\n\n%d - off\n%d - on\n%d - monoaudio\n",
+ wl->bt_coex_mode,
+ WL1251_BT_COEX_OFF,
+ WL1251_BT_COEX_ENABLE,
+ WL1251_BT_COEX_MONOAUDIO);
+ mutex_unlock(&wl->mutex);
+
+ return len;
+
+}
+
+static ssize_t wl1251_sysfs_store_bt_coex_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct wl1251 *wl = dev_get_drvdata(dev);
+ unsigned long res;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &res);
+
+ if (ret < 0) {
+ wl1251_warning("incorrect value written to bt_coex_mode");
+ return count;
+ }
+
+ mutex_lock(&wl->mutex);
+
+ if (res == wl->bt_coex_mode)
+ goto out;
+
+ switch (res) {
+ case WL1251_BT_COEX_OFF:
+ case WL1251_BT_COEX_ENABLE:
+ case WL1251_BT_COEX_MONOAUDIO:
+ wl->bt_coex_mode = res;
+ break;
+ default:
+ wl1251_warning("incorrect value written to bt_coex_mode");
+ goto out;
+ }
+
+ if (wl->state == WL1251_STATE_OFF)
+ goto out;
+
+ ret = wl1251_ps_elp_wakeup(wl);
+ if (ret < 0)
+ goto out;
+
+ wl1251_acx_sg_configure(wl, false);
+ wl1251_ps_elp_sleep(wl);
+
+out:
+ mutex_unlock(&wl->mutex);
+ return count;
+}
+
+static DEVICE_ATTR(bt_coex_mode, S_IRUGO | S_IWUSR,
+ wl1251_sysfs_show_bt_coex_mode,
+ wl1251_sysfs_store_bt_coex_mode);
+
+static void wl1251_device_release(struct device *dev)
+{
+
+}
+
+static struct platform_device wl1251_device = {
+ /* FIXME: use wl12xx name to not break the user space */
+ .name = "wl12xx",
+ .id = -1,
+
+ /* device model insists to have a release function */
+ .dev = {
+ .release = wl1251_device_release,
+ },
+};
+
static int wl1251_read_eeprom_byte(struct wl1251 *wl, off_t offset, u8 *data)
{
unsigned long timeout;
@@ -1368,6 +1457,22 @@ int wl1251_init_ieee80211(struct wl1251 *wl)
if (ret)
goto out;

+ /* Register platform device */
+ ret = platform_device_register(&wl1251_device);
+ if (ret) {
+ wl1251_error("couldn't register platform device");
+ goto out;
+ }
+ dev_set_drvdata(&wl1251_device.dev, wl);
+
+
+ /* Create sysfs file to control bt coex state */
+ ret = device_create_file(&wl1251_device.dev, &dev_attr_bt_coex_mode);
+ if (ret < 0) {
+ wl1251_error("failed to create sysfs file bt_coex_mode");
+ goto out;
+ }
+
wl1251_debugfs_init(wl);
wl1251_notice("initialized");

@@ -1420,6 +1525,7 @@ struct ieee80211_hw *wl1251_alloc_hw(void)
wl->beacon_int = WL1251_DEFAULT_BEACON_INT;
wl->dtim_period = WL1251_DEFAULT_DTIM_PERIOD;
wl->vif = NULL;
+ wl->bt_coex_mode = WL1251_BT_COEX_OFF;

for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
wl->tx_frames[i] = NULL;
@@ -1459,6 +1565,8 @@ int wl1251_free_hw(struct wl1251 *wl)

wl1251_debugfs_exit(wl);

+ platform_device_unregister(&wl1251_device);
+
kfree(wl->target_mem_map);
kfree(wl->data_path);
vfree(wl->fw);
diff --git a/drivers/net/wireless/ti/wl1251/wl1251.h b/drivers/net/wireless/ti/wl1251/wl1251.h
index fd02060..724c9f9 100644
--- a/drivers/net/wireless/ti/wl1251/wl1251.h
+++ b/drivers/net/wireless/ti/wl1251/wl1251.h
@@ -257,6 +257,12 @@ struct wl1251_debugfs {
struct dentry *excessive_retries;
};

+enum wl1251_bt_coex_mode {
+ WL1251_BT_COEX_OFF,
+ WL1251_BT_COEX_ENABLE,
+ WL1251_BT_COEX_MONOAUDIO
+};
+
struct wl1251_if_operations {
void (*read)(struct wl1251 *wl, int addr, void *buf, size_t len);
void (*write)(struct wl1251 *wl, int addr, void *buf, size_t len);
@@ -386,6 +392,8 @@ struct wl1251 {

struct ieee80211_vif *vif;

+ enum wl1251_bt_coex_mode bt_coex_mode;
+
u32 chip_id;
char fw_ver[21];

--
1.7.10.4


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