text: /******************************************************************************
   *
   * Copyright(c) 2003 - 2013 Intel Corporation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
   *
   * The full GNU General Public License is included in this distribution in the
   * file called LICENSE.
   *
   * Contact Information:
   *  Intel Linux Wireless <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *
   *****************************************************************************/
  
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/skbuff.h>
  #include <linux/netdevice.h>
  #include <net/mac80211.h>
  #include <linux/etherdevice.h>
  #include <asm/unaligned.h>
  #include "iwl-io.h"
  #include "iwl-trans.h"
  #include "iwl-modparams.h"
  #include "dev.h"
  #include "agn.h"
  
  /* Throughput		OFF time(ms)	ON time (ms)
   *	>300			25		25
   *	>200 to 300		40		40
   *	>100 to 200		55		55
   *	>70 to 100		65		65
   *	>50 to 70		75		75
   *	>20 to 50		85		85
   *	>10 to 20		95		95
   *	>5 to 10		110		110
   *	>1 to 5			130		130
   *	>0 to 1			167		167
   *	<=0					SOLID ON
   */
  static const struct ieee80211_tpt_blink iwl_blink[] = {
  	{ .throughput = 0, .blink_time = 334 },
  	{ .throughput = 1 * 1024 - 1, .blink_time = 260 },
  	{ .throughput = 5 * 1024 - 1, .blink_time = 220 },
  	{ .throughput = 10 * 1024 - 1, .blink_time = 190 },
  	{ .throughput = 20 * 1024 - 1, .blink_time = 170 },
  	{ .throughput = 50 * 1024 - 1, .blink_time = 150 },
  	{ .throughput = 70 * 1024 - 1, .blink_time = 130 },
  	{ .throughput = 100 * 1024 - 1, .blink_time = 110 },
  	{ .throughput = 200 * 1024 - 1, .blink_time = 80 },
  	{ .throughput = 300 * 1024 - 1, .blink_time = 50 },
  };
  
  /* Set led register off */
  void iwlagn_led_enable(struct iwl_priv *priv)
  {
  	iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
  }
  
  /*
   * Adjust led blink rate to compensate on a MAC Clock difference on every HW
   * Led blink rate analysis showed an average deviation of 20% on 5000 series
   * and up.
   * Need to compensate on the led on/off time per HW according to the deviation
   * to achieve the desired led frequency
   * The calculation is: (100-averageDeviation)/100 * blinkTime
   * For code efficiency the calculation will be:
   *     compensation = (100 - averageDeviation) * 64 / 100
   *     NewBlinkTime = (compensation * BlinkTime) / 64
   */
  static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
  				    u8 time, u16 compensation)
  {
  	if (!compensation) {
  		IWL_ERR(priv, "undefined blink compensation: "
  			"use pre-defined blinking time\n");
  		return time;
  	}
  
  	return (u8)((time * compensation) >> 6);
  }
  
  static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  {
  	struct iwl_host_cmd cmd = {
  		.id = REPLY_LEDS_CMD,
  		.len = { sizeof(struct iwl_led_cmd), },
  		.data = { led_cmd, },
  		.flags = CMD_ASYNC,
  	};
  	u32 reg;
  
  	reg = iwl_read32(priv->trans, CSR_LED_REG);
  	if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
  		iwl_write32(priv->trans, CSR_LED_REG,
  			    reg & CSR_LED_BSM_CTRL_MSK);
  
  	return iwl_dvm_send_cmd(priv, &cmd);
  }
  
  /* Set led pattern command */
  static int iwl_led_cmd(struct iwl_priv *priv,
  		       unsigned long on,
  		       unsigned long off)
  {
  	struct iwl_led_cmd led_cmd = {
  		.id = IWL_LED_LINK,
  		.interval = IWL_DEF_LED_INTRVL
  	};
  	int ret;
  
  	if (!test_bit(STATUS_READY, &priv->status))
  		return -EBUSY;
  
  	if (priv->blink_on == on && priv->blink_off == off)
  		return 0;
  
  	if (off == 0) {
  		/* led is SOLID_ON */
  		on = IWL_LED_SOLID;
  	}
  
  	IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
  			priv->cfg->base_params->led_compensation);
  	led_cmd.on = iwl_blink_compensation(priv, on,
  				priv->cfg->base_params->led_compensation);
  	led_cmd.off = iwl_blink_compensation(priv, off,
  				priv->cfg->base_params->led_compensation);
  
  	ret = iwl_send_led_cmd(priv, &led_cmd);
  	if (!ret) {
  		priv->blink_on = on;
  		priv->blink_off = off;
  	}
  	return ret;
  }
  
  static void iwl_led_brightness_set(struct led_classdev *led_cdev,
  				   enum led_brightness brightness)
  {
  	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
  	unsigned long on = 0;
  
  	if (brightness > 0)
  		on = IWL_LED_SOLID;
  
  	iwl_led_cmd(priv, on, 0);
  }
  
  static int iwl_led_blink_set(struct led_classdev *led_cdev,
  			     unsigned long *delay_on,
  			     unsigned long *delay_off)
  {
  	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
  
  	return iwl_led_cmd(priv, *delay_on, *delay_off);
  }
  
  void iwl_leds_init(struct iwl_priv *priv)
  {
  	int mode = iwlwifi_mod_params.led_mode;
  	int ret;
  
  	if (mode == IWL_LED_DISABLE) {
  		IWL_INFO(priv, "Led disabled\n");
  		return;
  	}
  	if (mode == IWL_LED_DEFAULT)
  		mode = priv->cfg->led_mode;
  
  	priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
  				   wiphy_name(priv->hw->wiphy));
  	priv->led.brightness_set = iwl_led_brightness_set;
  	priv->led.blink_set = iwl_led_blink_set;
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30)
  	priv->led.max_brightness = 1;
  #endif
  
  	switch (mode) {
  	case IWL_LED_DEFAULT:
  		WARN_ON(1);
  		break;
  	case IWL_LED_BLINK:
  		priv->led.default_trigger =
  			ieee80211_create_tpt_led_trigger(priv->hw,
  					IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
  					iwl_blink, ARRAY_SIZE(iwl_blink));
  		break;
  	case IWL_LED_RF_STATE:
  		priv->led.default_trigger =
  			ieee80211_get_radio_led_name(priv->hw);
  		break;
  	}
  
  	ret = led_classdev_register(priv->trans->dev, &priv->led);
  	if (ret) {
  		kfree(priv->led.name);
  		return;
  	}
  
  	priv->led_registered = true;
  }
  
  void iwl_leds_exit(struct iwl_priv *priv)
  {
  	if (!priv->led_registered)
  		return;
  
  	led_classdev_unregister(&priv->led);
  	kfree(priv->led.name);
  }
  