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 @@ -959,6 +960,14 @@ 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 @@ -1013,6 +1022,9 @@ 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 +16,138 @@
  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 +       u16 ng;
 121 +
 122 +       /* for now only AR9285 and AR9287 are recognized */
 123 +       if (AR_SREV_9287(sc->sc_ah))
 124 +               ng = AR9287_NUM_GPIO;
 125 +       else if (AR_SREV_9285(sc->sc_ah))
 126 +               ng = AR9285_NUM_GPIO;
 127 +       else
 128 +               return;
 129 +
 130 +       gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL);
 131 +       if (!gc)
 132 +               return;
 133 +
 134 +       snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
 135 +                wiphy_name(sc->hw->wiphy));
 136 +       gc->gchip.label = gc->label;
 137 +       gc->gchip.base = -1;    /* determine base automatically */
 138 +       gc->gchip.ngpio = ng;
 139 +       gc->gchip.direction_input = ath9k_gpio_pin_cfg_input;
 140 +       gc->gchip.direction_output = ath9k_gpio_pin_cfg_output;
 141 +       gc->gchip.get_direction = ath9k_gpio_pin_get_dir;
 142 +       gc->gchip.get = ath9k_gpio_pin_get;
 143 +       gc->gchip.set = ath9k_gpio_pin_set;
 144 +       gc->gchip.owner = THIS_MODULE;
 145 +
 146 +       if (gpiochip_add(&gc->gchip)) {
 147 +               kfree(gc);
 148 +               return;
 149 +       }
 150 +
 151 +       sc->gpiochip = gc;
 152 +       gc->sc = sc;
 153 +}
 154 +
 155 +/* remove GPIO chip */
 156 +static void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 157 +{
 158 +       struct ath9k_gpio_chip *gc = sc->gpiochip;
 159 +
 160 +       if (!gc)
 161 +               return;
 162 +
 163 +       gpiochip_remove(&gc->gchip);
 164 +       kfree(gc);
 165 +       sc->gpiochip = NULL;
 166 +}
 167 +
 168 +#else /* CONFIG_GPIOLIB */
 169 +
 170 +static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
 171 +{
 172 +}
 173 +
 174 +static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 175 +{
 176 +}
 177 +
 178 +#endif /* CONFIG_GPIOLIB */
 179
 180  /********************************/
 181  /*      LED functions          */
 182  /********************************/
 183
 184 -#ifdef CPTCFG_MAC80211_LEDS
 185 -
 186  static void ath_fill_led_pin(struct ath_softc *sc)
 187  {
 188         struct ath_hw *ah = sc->sc_ah;
 189 @@ -80,6 +205,12 @@ static int ath_add_led(struct ath_softc
 190         else
 191                 ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
 192
 193 +#ifdef CONFIG_GPIOLIB
 194 +       /* If there is GPIO chip configured, reserve LED pin */
 195 +       if (sc->gpiochip)
 196 +               gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name);
 197 +#endif
 198 +
 199         return 0;
 200  }
 201
 202 @@ -136,12 +267,18 @@ void ath_deinit_leds(struct ath_softc *s
 203
 204         while (!list_empty(&sc->leds)) {
 205                 led = list_first_entry(&sc->leds, struct ath_led, list);
 206 +#ifdef CONFIG_GPIOLIB
 207 +               /* If there is GPIO chip configured, free LED pin */
 208 +               if (sc->gpiochip)
 209 +                       gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio);
 210 +#endif
 211                 list_del(&led->list);
 212                 ath_led_brightness(&led->cdev, LED_OFF);
 213                 led_classdev_unregister(&led->cdev);
 214                 ath9k_hw_gpio_free(sc->sc_ah, led->gpio->gpio);
 215                 kfree(led);
 216         }
 217 +       ath9k_unregister_gpio_chip(sc);
 218  }
 219
 220  void ath_init_leds(struct ath_softc *sc)
 221 @@ -158,6 +295,8 @@ void ath_init_leds(struct ath_softc *sc)
 222
 223         ath_fill_led_pin(sc);
 224
 225 +       ath9k_register_gpio_chip(sc);
 226 +
 227         if (pdata && pdata->led_name)
 228                 strncpy(led_name, pdata->led_name, sizeof(led_name));
 229         else
 230 @@ -178,6 +317,7 @@ void ath_init_leds(struct ath_softc *sc)
 231         for (i = 0; i < pdata->num_leds; i++)
 232                 ath_create_platform_led(sc, &pdata->leds[i]);
 233  }
 234 +
 235  #endif
 236
 237  /*******************/