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 @@ -1001,6 +1002,14 @@ 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 @@ -1058,6 +1067,9 @@ 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 +16,130 @@
  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 +       gc->sc = sc;
 127 +       snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
 128 +                wiphy_name(sc->hw->wiphy));
 129 +
 130 +       gc->gchip.label = gc->label;
 131 +       gc->gchip.base = -1;    /* determine base automatically */
 132 +       gc->gchip.ngpio = ah->caps.num_gpio_pins;
 133 +       gc->gchip.direction_input = ath9k_gpio_pin_cfg_input;
 134 +       gc->gchip.direction_output = ath9k_gpio_pin_cfg_output;
 135 +       gc->gchip.get_direction = ath9k_gpio_pin_get_dir;
 136 +       gc->gchip.get = ath9k_gpio_pin_get;
 137 +       gc->gchip.set = ath9k_gpio_pin_set;
 138 +
 139 +       if (gpiochip_add(&gc->gchip)) {
 140 +               kfree(gc);
 141 +               return;
 142 +       }
 143 +
 144 +       sc->gpiochip = gc;
 145 +}
 146 +
 147 +/* remove GPIO chip */
 148 +static void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 149 +{
 150 +       struct ath9k_gpio_chip *gc = sc->gpiochip;
 151 +
 152 +       if (!gc)
 153 +               return;
 154 +
 155 +       gpiochip_remove(&gc->gchip);
 156 +       kfree(gc);
 157 +       sc->gpiochip = NULL;
 158 +}
 159 +
 160 +#else /* CONFIG_GPIOLIB */
 161 +
 162 +static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
 163 +{
 164 +}
 165 +
 166 +static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
 167 +{
 168 +}
 169 +
 170 +#endif /* CONFIG_GPIOLIB */
 171
 172  /********************************/
 173  /*      LED functions          */
 174  /********************************/
 175
 176 -#ifdef CPTCFG_MAC80211_LEDS
 177 -
 178  static void ath_fill_led_pin(struct ath_softc *sc)
 179  {
 180         struct ath_hw *ah = sc->sc_ah;
 181 @@ -80,6 +197,12 @@ static int ath_add_led(struct ath_softc
 182         else
 183                 ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
 184
 185 +#ifdef CONFIG_GPIOLIB
 186 +       /* If there is GPIO chip configured, reserve LED pin */
 187 +       if (sc->gpiochip)
 188 +               gpio_request(sc->gpiochip->gchip.base + gpio->gpio, gpio->name);
 189 +#endif
 190 +
 191         return 0;
 192  }
 193
 194 @@ -136,17 +259,24 @@ void ath_deinit_leds(struct ath_softc *s
 195
 196         while (!list_empty(&sc->leds)) {
 197                 led = list_first_entry(&sc->leds, struct ath_led, list);
 198 +#ifdef CONFIG_GPIOLIB
 199 +               /* If there is GPIO chip configured, free LED pin */
 200 +               if (sc->gpiochip)
 201 +                       gpio_free(sc->gpiochip->gchip.base + led->gpio->gpio);
 202 +#endif
 203                 list_del(&led->list);
 204                 ath_led_brightness(&led->cdev, LED_OFF);
 205                 led_classdev_unregister(&led->cdev);
 206                 ath9k_hw_gpio_free(sc->sc_ah, led->gpio->gpio);
 207                 kfree(led);
 208         }
 209 +       ath9k_unregister_gpio_chip(sc);
 210  }
 211
 212  void ath_init_leds(struct ath_softc *sc)
 213  {
 214         struct ath9k_platform_data *pdata = sc->dev->platform_data;
 215 +       struct device_node *np = sc->dev->of_node;
 216         char led_name[32];
 217         const char *trigger;
 218         int i;
 219 @@ -156,6 +286,15 @@ void ath_init_leds(struct ath_softc *sc)
 220         if (AR_SREV_9100(sc->sc_ah))
 221                 return;
 222
 223 +       if (!np)
 224 +               ath9k_register_gpio_chip(sc);
 225 +
 226 +       /* setup gpio controller only if requested and skip the led_pin setup */
 227 +       if (of_property_read_bool(np, "gpio-controller")) {
 228 +               ath9k_register_gpio_chip(sc);
 229 +               return;
 230 +       }
 231 +
 232         ath_fill_led_pin(sc);
 233
 234         if (pdata && pdata->leds && pdata->num_leds)
 235 @@ -180,6 +319,7 @@ void ath_init_leds(struct ath_softc *sc)
 236         ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger,
 237                            !sc->sc_ah->config.led_active_high);
 238  }
 239 +
 240  #endif
 241
 242  /*******************/