1/******************************************************************************
  2 *
  3 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or modify it
  6 * under the terms of version 2 of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful, but WITHOUT
 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12 * more details.
 13 *
 14 * You should have received a copy of the GNU General Public License along with
 15 * this program; if not, write to the Free Software Foundation, Inc.,
 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 17 *
 18 * The full GNU General Public License is included in this distribution in the
 19 * file called LICENSE.
 20 *
 21 * Contact Information:
 22 *  Intel Linux Wireless <ilw@linux.intel.com>
 23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 24 *
 25 *****************************************************************************/
 26
 27
 28#include <linux/kernel.h>
 29#include <linux/module.h>
 30#include <linux/init.h>
 31#include <linux/delay.h>
 32#include <linux/skbuff.h>
 33#include <linux/netdevice.h>
 34#include <linux/wireless.h>
 35#include <net/mac80211.h>
 36#include <linux/etherdevice.h>
 37#include <asm/unaligned.h>
 38
 39#include "iwl-dev.h"
 40#include "iwl-core.h"
 41#include "iwl-agn.h"
 42#include "iwl-io.h"
 43#include "iwl-trans.h"
 44
 45/* Throughput		OFF time(ms)	ON time (ms)
 46 *	>300			25		25
 47 *	>200 to 300		40		40
 48 *	>100 to 200		55		55
 49 *	>70 to 100		65		65
 50 *	>50 to 70		75		75
 51 *	>20 to 50		85		85
 52 *	>10 to 20		95		95
 53 *	>5 to 10		110		110
 54 *	>1 to 5			130		130
 55 *	>0 to 1			167		167
 56 *	<=0					SOLID ON
 57 */
 58static const struct ieee80211_tpt_blink iwl_blink[] = {
 59	{ .throughput = 0, .blink_time = 334 },
 60	{ .throughput = 1 * 1024 - 1, .blink_time = 260 },
 61	{ .throughput = 5 * 1024 - 1, .blink_time = 220 },
 62	{ .throughput = 10 * 1024 - 1, .blink_time = 190 },
 63	{ .throughput = 20 * 1024 - 1, .blink_time = 170 },
 64	{ .throughput = 50 * 1024 - 1, .blink_time = 150 },
 65	{ .throughput = 70 * 1024 - 1, .blink_time = 130 },
 66	{ .throughput = 100 * 1024 - 1, .blink_time = 110 },
 67	{ .throughput = 200 * 1024 - 1, .blink_time = 80 },
 68	{ .throughput = 300 * 1024 - 1, .blink_time = 50 },
 69};
 70
 71/* Set led register off */
 72void iwlagn_led_enable(struct iwl_priv *priv)
 73{
 74	iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 75}
 76
 77/*
 78 * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 79 * Led blink rate analysis showed an average deviation of 20% on 5000 series
 80 * and up.
 81 * Need to compensate on the led on/off time per HW according to the deviation
 82 * to achieve the desired led frequency
 83 * The calculation is: (100-averageDeviation)/100 * blinkTime
 84 * For code efficiency the calculation will be:
 85 *     compensation = (100 - averageDeviation) * 64 / 100
 86 *     NewBlinkTime = (compensation * BlinkTime) / 64
 87 */
 88static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
 89				    u8 time, u16 compensation)
 90{
 91	if (!compensation) {
 92		IWL_ERR(priv, "undefined blink compensation: "
 93			"use pre-defined blinking time\n");
 94		return time;
 95	}
 96
 97	return (u8)((time * compensation) >> 6);
 98}
 99
100static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
101{
102	struct iwl_host_cmd cmd = {
103		.id = REPLY_LEDS_CMD,
104		.len = { sizeof(struct iwl_led_cmd), },
105		.data = { led_cmd, },
106		.flags = CMD_ASYNC,
107		.callback = NULL,
108	};
109	u32 reg;
110
111	reg = iwl_read32(priv, CSR_LED_REG);
112	if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
113		iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
114
115	return trans_send_cmd(&priv->trans, &cmd);
116}
117
118/* Set led pattern command */
119static int iwl_led_cmd(struct iwl_priv *priv,
120		       unsigned long on,
121		       unsigned long off)
122{
123	struct iwl_led_cmd led_cmd = {
124		.id = IWL_LED_LINK,
125		.interval = IWL_DEF_LED_INTRVL
126	};
127	int ret;
128
129	if (!test_bit(STATUS_READY, &priv->status))
130		return -EBUSY;
131
132	if (priv->blink_on == on && priv->blink_off == off)
133		return 0;
134
135	if (off == 0) {
136		/* led is SOLID_ON */
137		on = IWL_LED_SOLID;
138	}
139
140	IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
141			priv->cfg->base_params->led_compensation);
142	led_cmd.on = iwl_blink_compensation(priv, on,
143				priv->cfg->base_params->led_compensation);
144	led_cmd.off = iwl_blink_compensation(priv, off,
145				priv->cfg->base_params->led_compensation);
146
147	ret = iwl_send_led_cmd(priv, &led_cmd);
148	if (!ret) {
149		priv->blink_on = on;
150		priv->blink_off = off;
151	}
152	return ret;
153}
154
155static void iwl_led_brightness_set(struct led_classdev *led_cdev,
156				   enum led_brightness brightness)
157{
158	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
159	unsigned long on = 0;
160
161	if (brightness > 0)
162		on = IWL_LED_SOLID;
163
164	iwl_led_cmd(priv, on, 0);
165}
166
167static int iwl_led_blink_set(struct led_classdev *led_cdev,
168			     unsigned long *delay_on,
169			     unsigned long *delay_off)
170{
171	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
172
173	return iwl_led_cmd(priv, *delay_on, *delay_off);
174}
175
176void iwl_leds_init(struct iwl_priv *priv)
177{
178	int mode = iwlagn_mod_params.led_mode;
179	int ret;
180
181	if (mode == IWL_LED_DEFAULT)
182		mode = priv->cfg->led_mode;
183
184	priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
185				   wiphy_name(priv->hw->wiphy));
186	priv->led.brightness_set = iwl_led_brightness_set;
187	priv->led.blink_set = iwl_led_blink_set;
188	priv->led.max_brightness = 1;
189
190	switch (mode) {
191	case IWL_LED_DEFAULT:
192		WARN_ON(1);
193		break;
194	case IWL_LED_BLINK:
195		priv->led.default_trigger =
196			ieee80211_create_tpt_led_trigger(priv->hw,
197					IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
198					iwl_blink, ARRAY_SIZE(iwl_blink));
199		break;
200	case IWL_LED_RF_STATE:
201		priv->led.default_trigger =
202			ieee80211_get_radio_led_name(priv->hw);
203		break;
204	}
205
206	ret = led_classdev_register(priv->bus->dev,
207				    &priv->led);
208	if (ret) {
209		kfree(priv->led.name);
210		return;
211	}
212
213	priv->led_registered = true;
214}
215
216void iwl_leds_exit(struct iwl_priv *priv)
217{
218	if (!priv->led_registered)
219		return;
220
221	led_classdev_unregister(&priv->led);
222	kfree(priv->led.name);
223}