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/*
* Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/****************\
GPIO Functions
\****************/
#include "ath5k.h"
#include "reg.h"
#include "debug.h"
/**
* DOC: GPIO/LED functions
*
* Here we control the 6 bidirectional GPIO pins provided by the hw.
* We can set a GPIO pin to be an input or an output pin on GPIO control
* register and then read or set its status from GPIO data input/output
* registers.
*
* We also control the two LED pins provided by the hw, LED_0 is our
* "power" LED and LED_1 is our "network activity" LED but many scenarios
* are available from hw. Vendors might also provide LEDs connected to the
* GPIO pins, we handle them through the LED subsystem on led.c
*/
/**
* ath5k_hw_set_ledstate() - Set led state
* @ah: The &struct ath5k_hw
* @state: One of AR5K_LED_*
*
* Used to set the LED blinking state. This only
* works for the LED connected to the LED_0, LED_1 pins,
* not the GPIO based.
*/
void
ath5k_hw_set_ledstate(struct ath5k_hw *ah, unsigned int state)
{
u32 led;
/*5210 has different led mode handling*/
u32 led_5210;
/*Reset led status*/
if (ah->ah_version != AR5K_AR5210)
AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG,
AR5K_PCICFG_LEDMODE | AR5K_PCICFG_LED);
else
AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_LED);
/*
* Some blinking values, define at your wish
*/
switch (state) {
case AR5K_LED_SCAN:
case AR5K_LED_AUTH:
led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_PEND;
led_5210 = AR5K_PCICFG_LED_PEND | AR5K_PCICFG_LED_BCTL;
break;
case AR5K_LED_INIT:
led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_NONE;
led_5210 = AR5K_PCICFG_LED_PEND;
break;
case AR5K_LED_ASSOC:
case AR5K_LED_RUN:
led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_ASSOC;
led_5210 = AR5K_PCICFG_LED_ASSOC;
break;
default:
led = AR5K_PCICFG_LEDMODE_PROM | AR5K_PCICFG_LED_NONE;
led_5210 = AR5K_PCICFG_LED_PEND;
break;
}
/*Write new status to the register*/
if (ah->ah_version != AR5K_AR5210)
AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led);
else
AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led_5210);
}
/**
* ath5k_hw_set_gpio_input() - Set GPIO inputs
* @ah: The &struct ath5k_hw
* @gpio: GPIO pin to set as input
*/
int
ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
{
if (gpio >= AR5K_NUM_GPIO)
return -EINVAL;
ath5k_hw_reg_write(ah,
(ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
| AR5K_GPIOCR_IN(gpio), AR5K_GPIOCR);
return 0;
}
/**
* ath5k_hw_set_gpio_output() - Set GPIO outputs
* @ah: The &struct ath5k_hw
* @gpio: The GPIO pin to set as output
*/
int
ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
{
if (gpio >= AR5K_NUM_GPIO)
return -EINVAL;
ath5k_hw_reg_write(ah,
(ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
| AR5K_GPIOCR_OUT(gpio), AR5K_GPIOCR);
return 0;
}
/**
* ath5k_hw_get_gpio() - Get GPIO state
* @ah: The &struct ath5k_hw
* @gpio: The GPIO pin to read
*/
u32
ath5k_hw_get_gpio(struct ath5k_hw *ah, u32 gpio)
{
if (gpio >= AR5K_NUM_GPIO)
return 0xffffffff;
/* GPIO input magic */
return ((ath5k_hw_reg_read(ah, AR5K_GPIODI) & AR5K_GPIODI_M) >> gpio) &
0x1;
}
/**
* ath5k_hw_set_gpio() - Set GPIO state
* @ah: The &struct ath5k_hw
* @gpio: The GPIO pin to set
* @val: Value to set (boolean)
*/
int
ath5k_hw_set_gpio(struct ath5k_hw *ah, u32 gpio, u32 val)
{
u32 data;
if (gpio >= AR5K_NUM_GPIO)
return -EINVAL;
/* GPIO output magic */
data = ath5k_hw_reg_read(ah, AR5K_GPIODO);
data &= ~(1 << gpio);
data |= (val & 1) << gpio;
ath5k_hw_reg_write(ah, data, AR5K_GPIODO);
return 0;
}
/**
* ath5k_hw_set_gpio_intr() - Initialize the GPIO interrupt (RFKill switch)
* @ah: The &struct ath5k_hw
* @gpio: The GPIO pin to use
* @interrupt_level: True to generate interrupt on active pin (high)
*
* This function is used to set up the GPIO interrupt for the hw RFKill switch.
* That switch is connected to a GPIO pin and it's number is stored on EEPROM.
* It can either open or close the circuit to indicate that we should disable
* RF/Wireless to save power (we also get that from EEPROM).
*/
void
ath5k_hw_set_gpio_intr(struct ath5k_hw *ah, unsigned int gpio,
u32 interrupt_level)
{
u32 data;
if (gpio >= AR5K_NUM_GPIO)
return;
/*
* Set the GPIO interrupt
*/
data = (ath5k_hw_reg_read(ah, AR5K_GPIOCR) &
~(AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_SELH |
AR5K_GPIOCR_INT_ENA | AR5K_GPIOCR_OUT(gpio))) |
(AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_ENA);
ath5k_hw_reg_write(ah, interrupt_level ? data :
(data | AR5K_GPIOCR_INT_SELH), AR5K_GPIOCR);
ah->ah_imr |= AR5K_IMR_GPIO;
/* Enable GPIO interrupts */
AR5K_REG_ENABLE_BITS(ah, AR5K_PIMR, AR5K_IMR_GPIO);
}
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