1/*
2 * Copyright (c) 2010-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include "htc.h"
18
19/******************/
20/*     BTCOEX     */
21/******************/
22
23#define ATH_HTC_BTCOEX_PRODUCT_ID "wb193"
24
25#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
26
27/*
28 * Detects if there is any priority bt traffic
29 */
30static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
31{
32	struct ath_btcoex *btcoex = &priv->btcoex;
33	struct ath_hw *ah = priv->ah;
34
35	if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
36		btcoex->bt_priority_cnt++;
37
38	if (time_after(jiffies, btcoex->bt_priority_time +
39			msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
40		clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
41		clear_bit(OP_BT_SCAN, &priv->op_flags);
42		/* Detect if colocated bt started scanning */
43		if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
44			ath_dbg(ath9k_hw_common(ah), BTCOEX,
45				"BT scan detected\n");
46			set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
47			set_bit(OP_BT_SCAN, &priv->op_flags);
48		} else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
49			ath_dbg(ath9k_hw_common(ah), BTCOEX,
50				"BT priority traffic detected\n");
51			set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
52		}
53
54		btcoex->bt_priority_cnt = 0;
55		btcoex->bt_priority_time = jiffies;
56	}
57}
58
59/*
60 * This is the master bt coex work which runs for every
61 * 45ms, bt traffic will be given priority during 55% of this
62 * period while wlan gets remaining 45%
63 */
64static void ath_btcoex_period_work(struct work_struct *work)
65{
66	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
67						   coex_period_work.work);
68	struct ath_btcoex *btcoex = &priv->btcoex;
69	struct ath_common *common = ath9k_hw_common(priv->ah);
70	u32 timer_period;
71	int ret;
72
73	ath_detect_bt_priority(priv);
74
75	ret = ath9k_htc_update_cap_target(priv,
76			  test_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags));
77	if (ret) {
78		ath_err(common, "Unable to set BTCOEX parameters\n");
79		return;
80	}
81
82	ath9k_hw_btcoex_bt_stomp(priv->ah, test_bit(OP_BT_SCAN, &priv->op_flags) ?
83				 ATH_BTCOEX_STOMP_ALL : btcoex->bt_stomp_type);
84
85	ath9k_hw_btcoex_enable(priv->ah);
86	timer_period = test_bit(OP_BT_SCAN, &priv->op_flags) ?
87		btcoex->btscan_no_stomp : btcoex->btcoex_no_stomp;
88	ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
89				     msecs_to_jiffies(timer_period));
90	ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
91				     msecs_to_jiffies(btcoex->btcoex_period));
92}
93
94/*
95 * Work to time slice between wlan and bt traffic and
96 * configure weight registers
97 */
98static void ath_btcoex_duty_cycle_work(struct work_struct *work)
99{
100	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
101						   duty_cycle_work.work);
102	struct ath_hw *ah = priv->ah;
103	struct ath_btcoex *btcoex = &priv->btcoex;
104	struct ath_common *common = ath9k_hw_common(ah);
105
106	ath_dbg(common, BTCOEX, "time slice work for bt and wlan\n");
107
108	if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
109	    test_bit(OP_BT_SCAN, &priv->op_flags))
110		ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
111	else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
112		ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
113
114	ath9k_hw_btcoex_enable(priv->ah);
115}
116
117static void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
118{
119	struct ath_btcoex *btcoex = &priv->btcoex;
120
121	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
122	btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
123		btcoex->btcoex_period / 100;
124	btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
125				   btcoex->btcoex_period / 100;
126	INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
127	INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
128}
129
130/*
131 * (Re)start btcoex work
132 */
133
134static void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
135{
136	struct ath_btcoex *btcoex = &priv->btcoex;
137	struct ath_hw *ah = priv->ah;
138
139	ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex work\n");
140
141	btcoex->bt_priority_cnt = 0;
142	btcoex->bt_priority_time = jiffies;
143	clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
144	clear_bit(OP_BT_SCAN, &priv->op_flags);
145	ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
146}
147
148
149/*
150 * Cancel btcoex and bt duty cycle work.
151 */
152static void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
153{
154	cancel_delayed_work_sync(&priv->coex_period_work);
155	cancel_delayed_work_sync(&priv->duty_cycle_work);
156}
157
158void ath9k_htc_start_btcoex(struct ath9k_htc_priv *priv)
159{
160	struct ath_hw *ah = priv->ah;
161
162	if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE) {
163		ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
164					   AR_STOMP_LOW_WLAN_WGHT, 0);
165		ath9k_hw_btcoex_enable(ah);
166		ath_htc_resume_btcoex_work(priv);
167	}
168}
169
170void ath9k_htc_stop_btcoex(struct ath9k_htc_priv *priv)
171{
172	struct ath_hw *ah = priv->ah;
173
174	if (ah->btcoex_hw.enabled &&
175	    ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
176		if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
177			ath_htc_cancel_btcoex_work(priv);
178		ath9k_hw_btcoex_disable(ah);
179	}
180}
181
182void ath9k_htc_init_btcoex(struct ath9k_htc_priv *priv, char *product)
183{
184	struct ath_hw *ah = priv->ah;
185	struct ath_common *common = ath9k_hw_common(ah);
186	int qnum;
187
188	/*
189	 * Check if BTCOEX is globally disabled.
190	 */
191	if (!common->btcoex_enabled) {
192		ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_NONE;
193		return;
194	}
195
196	if (product && strncmp(product, ATH_HTC_BTCOEX_PRODUCT_ID, 5) == 0) {
197		ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_3WIRE;
198	}
199
200	switch (ath9k_hw_get_btcoex_scheme(priv->ah)) {
201	case ATH_BTCOEX_CFG_NONE:
202		break;
203	case ATH_BTCOEX_CFG_3WIRE:
204		priv->ah->btcoex_hw.btactive_gpio = 7;
205		priv->ah->btcoex_hw.btpriority_gpio = 6;
206		priv->ah->btcoex_hw.wlanactive_gpio = 8;
207		priv->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
208		ath9k_hw_btcoex_init_3wire(priv->ah);
209		ath_htc_init_btcoex_work(priv);
210		qnum = priv->hwq_map[IEEE80211_AC_BE];
211		ath9k_hw_init_btcoex_hw(priv->ah, qnum);
212		break;
213	default:
214		WARN_ON(1);
215		break;
216	}
217}
218
219#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */
220
221/*******/
222/* LED */
223/*******/
224
225#ifdef CONFIG_MAC80211_LEDS
226void ath9k_led_work(struct work_struct *work)
227{
228	struct ath9k_htc_priv *priv = container_of(work,
229						   struct ath9k_htc_priv,
230						   led_work);
231
232	ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
233			  (priv->brightness == LED_OFF));
234}
235
236static void ath9k_led_brightness(struct led_classdev *led_cdev,
237				 enum led_brightness brightness)
238{
239	struct ath9k_htc_priv *priv = container_of(led_cdev,
240						   struct ath9k_htc_priv,
241						   led_cdev);
242
243	/* Not locked, but it's just a tiny green light..*/
244	priv->brightness = brightness;
245	ieee80211_queue_work(priv->hw, &priv->led_work);
246}
247
248void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
249{
250	if (!priv->led_registered)
251		return;
252
253	ath9k_led_brightness(&priv->led_cdev, LED_OFF);
254	led_classdev_unregister(&priv->led_cdev);
255	cancel_work_sync(&priv->led_work);
256
257	ath9k_hw_gpio_free(priv->ah, priv->ah->led_pin);
258}
259
260
261void ath9k_configure_leds(struct ath9k_htc_priv *priv)
262{
263	/* Configure gpio 1 for output */
264	ath9k_hw_gpio_request_out(priv->ah, priv->ah->led_pin,
265				  "ath9k-led",
266				  AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
267	/* LED off, active low */
268	ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);
269}
270
271void ath9k_init_leds(struct ath9k_htc_priv *priv)
272{
273	int ret;
274
275	if (AR_SREV_9287(priv->ah))
276		priv->ah->led_pin = ATH_LED_PIN_9287;
277	else if (AR_SREV_9271(priv->ah))
278		priv->ah->led_pin = ATH_LED_PIN_9271;
279	else if (AR_DEVID_7010(priv->ah))
280		priv->ah->led_pin = ATH_LED_PIN_7010;
281	else
282		priv->ah->led_pin = ATH_LED_PIN_DEF;
283
284	if (!ath9k_htc_led_blink)
285		priv->led_cdev.default_trigger =
286			ieee80211_get_radio_led_name(priv->hw);
287
288	ath9k_configure_leds(priv);
289
290	snprintf(priv->led_name, sizeof(priv->led_name),
291		"ath9k_htc-%s", wiphy_name(priv->hw->wiphy));
292	priv->led_cdev.name = priv->led_name;
293	priv->led_cdev.brightness_set = ath9k_led_brightness;
294
295	ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &priv->led_cdev);
296	if (ret < 0)
297		return;
298
299	INIT_WORK(&priv->led_work, ath9k_led_work);
300	priv->led_registered = true;
301
302	return;
303}
304#endif
305
306/*******************/
307/*	Rfkill	   */
308/*******************/
309
310static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
311{
312	bool is_blocked;
313
314	ath9k_htc_ps_wakeup(priv);
315	is_blocked = ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
316						 priv->ah->rfkill_polarity;
317	ath9k_htc_ps_restore(priv);
318
319	return is_blocked;
320}
321
322void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
323{
324	struct ath9k_htc_priv *priv = hw->priv;
325	bool blocked = !!ath_is_rfkill_set(priv);
326
327	wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
328}
329
330void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
331{
332	if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
333		wiphy_rfkill_start_polling(priv->hw->wiphy);
334}
335