1/*
  2 * Common code for mac80211 Prism54 drivers
  3 *
  4 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
  5 * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
  6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  7 *
  8 * Based on:
  9 * - the islsm (softmac prism54) driver, which is:
 10 *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
 11 * - stlc45xx driver
 12 *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 13 *
 14 * This program is free software; you can redistribute it and/or modify
 15 * it under the terms of the GNU General Public License version 2 as
 16 * published by the Free Software Foundation.
 17 */
 18
 19#include <linux/firmware.h>
 20#include <linux/etherdevice.h>
 21
 22#include <net/mac80211.h>
 23#ifdef CONFIG_P54_LEDS
 24#include <linux/leds.h>
 25#endif /* CONFIG_P54_LEDS */
 26
 27#include "p54.h"
 28#include "lmac.h"
 29
 30static void p54_update_leds(struct work_struct *work)
 31{
 32	struct p54_common *priv = container_of(work, struct p54_common,
 33					       led_work.work);
 34	int err, i, tmp, blink_delay = 400;
 35	bool rerun = false;
 36
 37	/* Don't toggle the LED, when the device is down. */
 38	if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
 39		return ;
 40
 41	for (i = 0; i < ARRAY_SIZE(priv->leds); i++)
 42		if (priv->leds[i].toggled) {
 43			priv->softled_state |= BIT(i);
 44
 45			tmp = 70 + 200 / (priv->leds[i].toggled);
 46			if (tmp < blink_delay)
 47				blink_delay = tmp;
 48
 49			if (priv->leds[i].led_dev.brightness == LED_OFF)
 50				rerun = true;
 51
 52			priv->leds[i].toggled =
 53				!!priv->leds[i].led_dev.brightness;
 54		} else
 55			priv->softled_state &= ~BIT(i);
 56
 57	err = p54_set_leds(priv);
 58	if (err && net_ratelimit())
 59		wiphy_err(priv->hw->wiphy,
 60			  "failed to update LEDs (%d).\n", err);
 61
 62	if (rerun)
 63		ieee80211_queue_delayed_work(priv->hw, &priv->led_work,
 64			msecs_to_jiffies(blink_delay));
 65}
 66
 67static void p54_led_brightness_set(struct led_classdev *led_dev,
 68				   enum led_brightness brightness)
 69{
 70	struct p54_led_dev *led = container_of(led_dev, struct p54_led_dev,
 71					       led_dev);
 72	struct ieee80211_hw *dev = led->hw_dev;
 73	struct p54_common *priv = dev->priv;
 74
 75	if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
 76		return ;
 77
 78	if ((brightness) && (led->registered)) {
 79		led->toggled++;
 80		ieee80211_queue_delayed_work(priv->hw, &priv->led_work, HZ/10);
 81	}
 82}
 83
 84static int p54_register_led(struct p54_common *priv,
 85			    unsigned int led_index,
 86			    char *name, char *trigger)
 87{
 88	struct p54_led_dev *led = &priv->leds[led_index];
 89	int err;
 90
 91	if (led->registered)
 92		return -EEXIST;
 93
 94	snprintf(led->name, sizeof(led->name), "p54-%s::%s",
 95		 wiphy_name(priv->hw->wiphy), name);
 96	led->hw_dev = priv->hw;
 97	led->index = led_index;
 98	led->led_dev.name = led->name;
 99	led->led_dev.default_trigger = trigger;
100	led->led_dev.brightness_set = p54_led_brightness_set;
101
102	err = led_classdev_register(wiphy_dev(priv->hw->wiphy), &led->led_dev);
103	if (err)
104		wiphy_err(priv->hw->wiphy,
105			  "Failed to register %s LED.\n", name);
106	else
107		led->registered = 1;
108
109	return err;
110}
111
112int p54_init_leds(struct p54_common *priv)
113{
114	int err;
115
116	/*
117	 * TODO:
118	 * Figure out if the EEPROM contains some hints about the number
119	 * of available/programmable LEDs of the device.
120	 */
121
122	INIT_DELAYED_WORK(&priv->led_work, p54_update_leds);
123
124	err = p54_register_led(priv, 0, "assoc",
125			       ieee80211_get_assoc_led_name(priv->hw));
126	if (err)
127		return err;
128
129	err = p54_register_led(priv, 1, "tx",
130			       ieee80211_get_tx_led_name(priv->hw));
131	if (err)
132		return err;
133
134	err = p54_register_led(priv, 2, "rx",
135			       ieee80211_get_rx_led_name(priv->hw));
136	if (err)
137		return err;
138
139	err = p54_register_led(priv, 3, "radio",
140			       ieee80211_get_radio_led_name(priv->hw));
141	if (err)
142		return err;
143
144	err = p54_set_leds(priv);
145	return err;
146}
147
148void p54_unregister_leds(struct p54_common *priv)
149{
150	int i;
151
152	for (i = 0; i < ARRAY_SIZE(priv->leds); i++) {
153		if (priv->leds[i].registered) {
154			priv->leds[i].registered = false;
155			priv->leds[i].toggled = 0;
156			led_classdev_unregister(&priv->leds[i].led_dev);
157		}
158	}
159
160	cancel_delayed_work_sync(&priv->led_work);
161}