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/pci.h>
 32#include <linux/dma-mapping.h>
 33#include <linux/delay.h>
 34#include <linux/skbuff.h>
 35#include <linux/netdevice.h>
 36#include <linux/wireless.h>
 37#include <net/mac80211.h>
 38#include <linux/etherdevice.h>
 39#include <asm/unaligned.h>
 40
 41#include "iwl-dev.h"
 42#include "iwl-core.h"
 43#include "iwl-io.h"
 44
 45/* default: IWL_LED_BLINK(0) using blinking index table */
 46static int led_mode;
 47module_param(led_mode, int, S_IRUGO);
 48MODULE_PARM_DESC(led_mode, "0=system default, "
 49		"1=On(RF On)/Off(RF Off), 2=blinking");
 50
 51/* Throughput		OFF time(ms)	ON time (ms)
 52 *	>300			25		25
 53 *	>200 to 300		40		40
 54 *	>100 to 200		55		55
 55 *	>70 to 100		65		65
 56 *	>50 to 70		75		75
 57 *	>20 to 50		85		85
 58 *	>10 to 20		95		95
 59 *	>5 to 10		110		110
 60 *	>1 to 5			130		130
 61 *	>0 to 1			167		167
 62 *	<=0					SOLID ON
 63 */
 64static const struct ieee80211_tpt_blink iwl_blink[] = {
 65	{ .throughput = 0, .blink_time = 334 },
 66	{ .throughput = 1 * 1024 - 1, .blink_time = 260 },
 67	{ .throughput = 5 * 1024 - 1, .blink_time = 220 },
 68	{ .throughput = 10 * 1024 - 1, .blink_time = 190 },
 69	{ .throughput = 20 * 1024 - 1, .blink_time = 170 },
 70	{ .throughput = 50 * 1024 - 1, .blink_time = 150 },
 71	{ .throughput = 70 * 1024 - 1, .blink_time = 130 },
 72	{ .throughput = 100 * 1024 - 1, .blink_time = 110 },
 73	{ .throughput = 200 * 1024 - 1, .blink_time = 80 },
 74	{ .throughput = 300 * 1024 - 1, .blink_time = 50 },
 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 0% on 3945,
 80 * 5% on 4965 HW.
 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_legacy_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
100/* Set led pattern command */
101static int iwl_legacy_led_cmd(struct iwl_priv *priv,
102		       unsigned long on,
103		       unsigned long off)
104{
105	struct iwl_led_cmd led_cmd = {
106		.id = IWL_LED_LINK,
107		.interval = IWL_DEF_LED_INTRVL
108	};
109	int ret;
110
111	if (!test_bit(STATUS_READY, &priv->status))
112		return -EBUSY;
113
114	if (priv->blink_on == on && priv->blink_off == off)
115		return 0;
116
117	if (off == 0) {
118		/* led is SOLID_ON */
119		on = IWL_LED_SOLID;
120	}
121
122	IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
123			priv->cfg->base_params->led_compensation);
124	led_cmd.on = iwl_legacy_blink_compensation(priv, on,
125				priv->cfg->base_params->led_compensation);
126	led_cmd.off = iwl_legacy_blink_compensation(priv, off,
127				priv->cfg->base_params->led_compensation);
128
129	ret = priv->cfg->ops->led->cmd(priv, &led_cmd);
130	if (!ret) {
131		priv->blink_on = on;
132		priv->blink_off = off;
133	}
134	return ret;
135}
136
137static void iwl_legacy_led_brightness_set(struct led_classdev *led_cdev,
138				   enum led_brightness brightness)
139{
140	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
141	unsigned long on = 0;
142
143	if (brightness > 0)
144		on = IWL_LED_SOLID;
145
146	iwl_legacy_led_cmd(priv, on, 0);
147}
148
149static int iwl_legacy_led_blink_set(struct led_classdev *led_cdev,
150			     unsigned long *delay_on,
151			     unsigned long *delay_off)
152{
153	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
154
155	return iwl_legacy_led_cmd(priv, *delay_on, *delay_off);
156}
157
158void iwl_legacy_leds_init(struct iwl_priv *priv)
159{
160	int mode = led_mode;
161	int ret;
162
163	if (mode == IWL_LED_DEFAULT)
164		mode = priv->cfg->led_mode;
165
166	priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
167				   wiphy_name(priv->hw->wiphy));
168	priv->led.brightness_set = iwl_legacy_led_brightness_set;
169	priv->led.blink_set = iwl_legacy_led_blink_set;
170	priv->led.max_brightness = 1;
171
172	switch (mode) {
173	case IWL_LED_DEFAULT:
174		WARN_ON(1);
175		break;
176	case IWL_LED_BLINK:
177		priv->led.default_trigger =
178			ieee80211_create_tpt_led_trigger(priv->hw,
179					IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
180					iwl_blink, ARRAY_SIZE(iwl_blink));
181		break;
182	case IWL_LED_RF_STATE:
183		priv->led.default_trigger =
184			ieee80211_get_radio_led_name(priv->hw);
185		break;
186	}
187
188	ret = led_classdev_register(&priv->pci_dev->dev, &priv->led);
189	if (ret) {
190		kfree(priv->led.name);
191		return;
192	}
193
194	priv->led_registered = true;
195}
196EXPORT_SYMBOL(iwl_legacy_leds_init);
197
198void iwl_legacy_leds_exit(struct iwl_priv *priv)
199{
200	if (!priv->led_registered)
201		return;
202
203	led_classdev_unregister(&priv->led);
204	kfree(priv->led.name);
205}
206EXPORT_SYMBOL(iwl_legacy_leds_exit);