package/kernel/mac80211/patches/548-ath9k_enable_gpio_chip.patch

   1 From: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
   2 Date: Sun, 31 Jan 2016 21:01:31 +0100
   3 Subject: [PATCH v4 4/8] mac80211: ath9k: enable access to GPIO
   4
   5 Enable access to GPIO chip and its pins for Atheros AR92xx
   6 wireless devices. For now AR9285 and AR9287 are supported.
   7
   8 Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
  12 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
  13 @@ -24,6 +24,7 @@
  14  #include <linux/completion.h>
  15  #include <linux/time.h>
  16  #include <linux/hw_random.h>
  17 +#include <linux/gpio/driver.h>
  18
  19  #include "common.h"
  20  #include "debug.h"
  21 @@ -962,6 +963,14 @@ struct ath_led {
  22         struct led_classdev cdev;
  23  };
  24
  25 +#ifdef CONFIG_GPIOLIB
  26 +struct ath9k_gpio_chip {
  27 +       struct ath_softc *sc;
  28 +       char label[32];
  29 +       struct gpio_chip gchip;
  30 +};
  31 +#endif
  32 +
  33  struct ath_softc {
  34         struct ieee80211_hw *hw;
  35         struct device *dev;
  36 @@ -1016,6 +1025,9 @@ struct ath_softc {
  37  #ifdef CPTCFG_MAC80211_LEDS
  38         const char *led_default_trigger;
  39         struct list_head leds;
  40 +#ifdef CONFIG_GPIOLIB
  41 +       struct ath9k_gpio_chip *gpiochip;
  42 +#endif
  43  #endif
  44
  45  #ifdef CPTCFG_ATH9K_DEBUGFS
  46 --- a/drivers/net/wireless/ath/ath9k/gpio.c
  47 +++ b/drivers/net/wireless/ath/ath9k/gpio.c
  48 @@ -16,13 +16,134 @@
  49
  50  #include "ath9k.h"
  51  #include <linux/ath9k_platform.h>
  52 +#include <linux/gpio.h>
  53 +
  54 +#ifdef CPTCFG_MAC80211_LEDS
  55 +
  56 +#ifdef CONFIG_GPIOLIB
  57 +
  58 +/***************/
  59 +/*  GPIO Chip  */
  60 +/***************/
  61 +
  62 +/* gpio_chip handler : set GPIO to input */
  63 +static int ath9k_gpio_pin_cfg_input(struct gpio_chip *chip, unsigned offset)
  64 +{
  65 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
  66 +                                                 gchip);
  67 +
  68 +       ath9k_hw_gpio_request_in(gc->sc->sc_ah, offset, "ath9k-gpio");
  69 +
  70 +       return 0;
  71 +}
  72 +
  73 +/* gpio_chip handler : set GPIO to output */
  74 +static int ath9k_gpio_pin_cfg_output(struct gpio_chip *chip, unsigned offset,
  75 +                                    int value)
  76 +{
  77 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
  78 +                                                 gchip);
  79 +
  80 +       ath9k_hw_gpio_request_out(gc->sc->sc_ah, offset, "ath9k-gpio",
  81 +                                 AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  82 +       ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
  83 +
  84 +       return 0;
  85 +}
  86 +
  87 +/* gpio_chip handler : query GPIO direction (0=out, 1=in) */
  88 +static int ath9k_gpio_pin_get_dir(struct gpio_chip *chip, unsigned offset)
  89 +{
  90 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
  91 +                                                 gchip);
  92 +       struct ath_hw *ah = gc->sc->sc_ah;
  93 +
  94 +       return !((REG_READ(ah, AR_GPIO_OE_OUT) >> (offset * 2)) & 3);
  95 +}
  96 +
  97 +/* gpio_chip handler : get GPIO pin value */
  98 +static int ath9k_gpio_pin_get(struct gpio_chip *chip, unsigned offset)
  99 +{
 100 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 101 +                                                 gchip);
 102 +
 103 +       return ath9k_hw_gpio_get(gc->sc->sc_ah, offset);
 104 +}
 105 +
 106 +/* gpio_chip handler : set GPIO pin to value */
 107 +static void ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset,
 108 +                              int value)
 109 +{
 110 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 111 +                                                 gchip);
 112 +
 113 +       ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
 114 +}
 115 +
 116 +/* register GPIO chip */
 117 +static void ath9k_register_gpio_chip(struct ath_softc *sc)
 118 +{
 119 +       struct ath9k_gpio_chip *gc;
 120 +       struct ath_hw *ah = sc->sc_ah;
 121 +
 122 +       gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL);
 123 +       if (!gc)
 124 +               return;
 125 +
 126 +       snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
 127 +                wiphy_name(sc->hw->wiphy));
 128 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
 129 +       gc->gchip.parent = sc->dev;
 130 +#else
 131 +       gc->gchip.dev = sc->dev;
 132 +#endif
 133 +       gc->gchip.label = gc->label;
 134 +       gc->gchip.base = -1;    /* determine base automatically */
 135 +       gc->gchip.ngpio = ah->caps.num_gpio_pins;
 136 +       gc->gchip.direction_input = ath9k_gpio_pin_cfg_input;
 137 +       gc->gchip.direction_output = ath9k_gpio_pin_cfg_output;
 138 +       gc->gchip.get_direction = ath9k_gpio_pin_get_dir;
 139 +       gc->gchip.get = ath9k_gpio_pin_get;
 140 +       gc->gchip.set = ath9k_gpio_pin_set;
 141 +
 142 +       if (gpiochip_add(&gc->gchip)) {
 143 +               kfree(gc);
 144 +               return;
 145 +       }
 146 +
 147 +       sc->gpiochip = gc;
 148 +       gc->sc = sc;
 149 +}
 150 +
 151 +/* remove GPIO chip */
 152 +static void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 153 +{
 154 +       struct ath9k_gpio_chip *gc = sc->gpiochip;
 155 +
 156 +       if (!gc)
 157 +               return;
 158 +
 159 +       gpiochip_remove(&gc->gchip);
 160 +       kfree(gc);
 161 +       sc->gpiochip = NULL;
 162 +}
 163 +
 164 +#else /* CONFIG_GPIOLIB */
 165 +
 166 +static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
 167 +{
 168 +}
 169 +
 170 +static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 171 +{
 172 +}
 173 +
 174 +#endif /* CONFIG_GPIOLIB */
 175
 176  /********************************/
 177  /*      LED functions          */
 178  /********************************/
 179
 180 -#ifdef CPTCFG_MAC80211_LEDS
 181 -
 182  static void ath_fill_led_pin(struct ath_softc *sc)
 183  {
 184         struct ath_hw *ah = sc->sc_ah;
 185 @@ -80,6 +201,12 @@ static int ath_add_led(struct ath_softc
 186         else
 187                 ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
 188
 189 +#ifdef CONFIG_GPIOLIB
 190 +       /* If there is GPIO chip configured, reserve LED pin */
 191 +       if (sc->gpiochip)
 192 +               gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name);
 193 +#endif
 194 +
 195         return 0;
 196  }
 197
 198 @@ -136,12 +263,18 @@ void ath_deinit_leds(struct ath_softc *s
 199
 200         while (!list_empty(&sc->leds)) {
 201                 led = list_first_entry(&sc->leds, struct ath_led, list);
 202 +#ifdef CONFIG_GPIOLIB
 203 +               /* If there is GPIO chip configured, free LED pin */
 204 +               if (sc->gpiochip)
 205 +                       gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio);
 206 +#endif
 207                 list_del(&led->list);
 208                 ath_led_brightness(&led->cdev, LED_OFF);
 209                 led_classdev_unregister(&led->cdev);
 210                 ath9k_hw_gpio_free(sc->sc_ah, led->gpio->gpio);
 211                 kfree(led);
 212         }
 213 +       ath9k_unregister_gpio_chip(sc);
 214  }
 215
 216  void ath_init_leds(struct ath_softc *sc)
 217 @@ -158,6 +291,8 @@ void ath_init_leds(struct ath_softc *sc)
 218
 219         ath_fill_led_pin(sc);
 220
 221 +       ath9k_register_gpio_chip(sc);
 222 +
 223         if (pdata && pdata->led_name)
 224                 strncpy(led_name, pdata->led_name, sizeof(led_name));
 225         else
 226 @@ -178,6 +313,7 @@ void ath_init_leds(struct ath_softc *sc)
 227         for (i = 0; i < pdata->num_leds; i++)
 228                 ath_create_platform_led(sc, &pdata->leds[i]);
 229  }
 230 +
 231  #endif
 232
 233  /*******************/