package/kernel/mac80211/patches/549-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 ---
  10  ath9k.h |   23 ++++++++++++
  11  gpio.c  |  121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  12  init.c  |    2 +
  13  3 files changed, 146 insertions(+)
  14
  15 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
  16 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
  17 @@ -24,6 +24,7 @@
  18  #include <linux/completion.h>
  19  #include <linux/time.h>
  20  #include <linux/hw_random.h>
  21 +#include <linux/gpio/driver.h>
  22
  23  #include "common.h"
  24  #include "debug.h"
  25 @@ -817,6 +818,13 @@ void ath_fill_led_pin(struct ath_softc *
  26  int ath_create_gpio_led(struct ath_softc *sc, int gpio, const char *name,
  27                          const char *trigger, bool active_low);
  28
  29 +/***************/
  30 +/*  GPIO Chip  */
  31 +/***************/
  32 +
  33 +void ath9k_register_gpio_chip(struct ath_softc *sc);
  34 +void ath9k_unregister_gpio_chip(struct ath_softc *sc);
  35 +
  36  #else
  37  static inline void ath_init_leds(struct ath_softc *sc)
  38  {
  39 @@ -828,6 +836,14 @@ static inline void ath_deinit_leds(struc
  40  static inline void ath_fill_led_pin(struct ath_softc *sc)
  41  {
  42  }
  43 +
  44 +static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
  45 +{
  46 +}
  47 +
  48 +static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
  49 +{
  50 +}
  51  #endif
  52
  53  /************************/
  54 @@ -963,6 +979,12 @@ struct ath_led {
  55         struct led_classdev cdev;
  56  };
  57
  58 +struct ath9k_gpio_chip {
  59 +       struct ath_softc *sc;
  60 +       char label[32];
  61 +       struct gpio_chip gchip;
  62 +};
  63 +
  64  struct ath_softc {
  65         struct ieee80211_hw *hw;
  66         struct device *dev;
  67 @@ -1017,6 +1039,7 @@ struct ath_softc {
  68  #ifdef CPTCFG_MAC80211_LEDS
  69         const char *led_default_trigger;
  70         struct list_head leds;
  71 +       struct ath9k_gpio_chip *gpiochip;
  72  #endif
  73
  74  #ifdef CPTCFG_ATH9K_DEBUGFS
  75 --- a/drivers/net/wireless/ath/ath9k/gpio.c
  76 +++ b/drivers/net/wireless/ath/ath9k/gpio.c
  77 @@ -22,6 +22,9 @@
  78  /********************************/
  79
  80  #ifdef CPTCFG_MAC80211_LEDS
  81 +
  82 +#include <asm-generic/gpio.h>
  83 +
  84  static void ath_led_brightness(struct led_classdev *led_cdev,
  85                                enum led_brightness brightness)
  86  {
  87 @@ -60,6 +63,10 @@ static int ath_add_led(struct ath_softc
  88         else
  89                 ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
  90
  91 +       /* If there is GPIO chip configured, reserve LED pin */
  92 +       if (sc->gpiochip)
  93 +               gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name);
  94 +
  95         return 0;
  96  }
  97
  98 @@ -116,6 +123,9 @@ void ath_deinit_leds(struct ath_softc *s
  99
 100         while (!list_empty(&sc->leds)) {
 101                 led = list_first_entry(&sc->leds, struct ath_led, list);
 102 +               /* If there is GPIO chip configured, free LED pin */
 103 +               if (sc->gpiochip)
 104 +                       gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio);
 105                 list_del(&led->list);
 106                 ath_led_brightness(&led->cdev, LED_OFF);
 107                 led_classdev_unregister(&led->cdev);
 108 @@ -186,6 +196,117 @@ void ath_fill_led_pin(struct ath_softc *
 109         /* LED off, active low */
 110         ath9k_hw_set_gpio(ah, ah->led_pin, (ah->config.led_active_high) ? 0 : 1);
 111  }
 112 +
 113 +/***************/
 114 +/*  GPIO Chip  */
 115 +/***************/
 116 +
 117 +/* gpio_chip handler : set GPIO to input */
 118 +static int ath9k_gpio_pin_cfg_input(struct gpio_chip *chip, unsigned offset)
 119 +{
 120 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 121 +                                                 gchip);
 122 +
 123 +       ath9k_hw_cfg_gpio_input(gc->sc->sc_ah, offset);
 124 +
 125 +       return 0;
 126 +}
 127 +
 128 +/* gpio_chip handler : set GPIO to output */
 129 +static int ath9k_gpio_pin_cfg_output(struct gpio_chip *chip, unsigned offset,
 130 +                                    int value)
 131 +{
 132 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 133 +                                                 gchip);
 134 +
 135 +       ath9k_hw_cfg_output(gc->sc->sc_ah, offset,
 136 +                           AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 137 +       ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
 138 +
 139 +       return 0;
 140 +}
 141 +
 142 +/* gpio_chip handler : query GPIO direction (0=out, 1=in) */
 143 +static int ath9k_gpio_pin_get_dir(struct gpio_chip *chip, unsigned offset)
 144 +{
 145 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 146 +                                                 gchip);
 147 +       struct ath_hw *ah = gc->sc->sc_ah;
 148 +
 149 +       return !((REG_READ(ah, AR_GPIO_OE_OUT) >> (offset * 2)) & 3);
 150 +}
 151 +
 152 +/* gpio_chip handler : get GPIO pin value */
 153 +static int ath9k_gpio_pin_get(struct gpio_chip *chip, unsigned offset)
 154 +{
 155 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 156 +                                                 gchip);
 157 +
 158 +       return ath9k_hw_gpio_get(gc->sc->sc_ah, offset);
 159 +}
 160 +
 161 +/* gpio_chip handler : set GPIO pin to value */
 162 +static void ath9k_gpio_pin_set(struct gpio_chip *chip, unsigned offset,
 163 +                              int value)
 164 +{
 165 +       struct ath9k_gpio_chip *gc = container_of(chip, struct ath9k_gpio_chip,
 166 +                                                 gchip);
 167 +
 168 +       ath9k_hw_set_gpio(gc->sc->sc_ah, offset, value);
 169 +}
 170 +
 171 +/* register GPIO chip */
 172 +void ath9k_register_gpio_chip(struct ath_softc *sc)
 173 +{
 174 +       struct ath9k_gpio_chip *gc;
 175 +       u16 ng;
 176 +
 177 +       /* for now only AR9285 and AR9287 are recognized */
 178 +       if (AR_SREV_9287(sc->sc_ah))
 179 +               ng = AR9287_NUM_GPIO;
 180 +       else if (AR_SREV_9285(sc->sc_ah))
 181 +               ng = AR9285_NUM_GPIO;
 182 +       else
 183 +               return;
 184 +
 185 +       gc = kzalloc(sizeof(struct ath9k_gpio_chip), GFP_KERNEL);
 186 +       if (!gc)
 187 +               return;
 188 +
 189 +       snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
 190 +                wiphy_name(sc->hw->wiphy));
 191 +       gc->gchip.label = gc->label;
 192 +       gc->gchip.base = -1;    /* determine base automatically */
 193 +       gc->gchip.ngpio = ng;
 194 +       gc->gchip.direction_input = ath9k_gpio_pin_cfg_input;
 195 +       gc->gchip.direction_output = ath9k_gpio_pin_cfg_output;
 196 +       gc->gchip.get_direction = ath9k_gpio_pin_get_dir;
 197 +       gc->gchip.get = ath9k_gpio_pin_get;
 198 +       gc->gchip.set = ath9k_gpio_pin_set;
 199 +       gc->gchip.owner = THIS_MODULE;
 200 +
 201 +       if (gpiochip_add(&gc->gchip)) {
 202 +               kfree(gc);
 203 +               return;
 204 +       }
 205 +
 206 +       sc->gpiochip = gc;
 207 +       gc->sc = sc;
 208 +}
 209 +
 210 +/* remove GPIO chip */
 211 +void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 212 +{
 213 +       struct ath9k_gpio_chip *gc = sc->gpiochip;
 214 +
 215 +       if (!gc)
 216 +               return;
 217 +
 218 +       gpiochip_remove(&gc->gchip);
 219 +       kfree(gc);
 220 +       sc->gpiochip = NULL;
 221 +}
 222 +
 223  #endif
 224
 225  /*******************/
 226 --- a/drivers/net/wireless/ath/ath9k/init.c
 227 +++ b/drivers/net/wireless/ath/ath9k/init.c
 228 @@ -979,6 +979,7 @@ int ath9k_init_device(u16 devid, struct
 229                         goto debug_cleanup;
 230         }
 231
 232 +       ath9k_register_gpio_chip(sc);
 233         ath_init_leds(sc);
 234         ath_start_rfkill_poll(sc);
 235
 236 @@ -1026,6 +1027,7 @@ void ath9k_deinit_device(struct ath_soft
 237
 238         wiphy_rfkill_stop_polling(sc->hw->wiphy);
 239         ath_deinit_leds(sc);
 240 +       ath9k_unregister_gpio_chip(sc);
 241
 242         ath9k_ps_restore(sc);
 243