mac80211: ath9k: enable GPIO buttons

Enable platform-defined GPIO button support for ath9k device.
Key poller is activated for attached platform buttons.
Requires ath9k GPIO chip access.

Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>

SVN-Revision: 48921

4 files changed, 194 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/550-ath9k_enable_gpio_buttons.patch b/package/kernel/mac80211/patches/550-ath9k_enable_gpio_buttons.patch
new file mode 100644
index 0000000000..e3a8cece94
--- /dev/null
+++ b/package/kernel/mac80211/patches/550-ath9k_enable_gpio_buttons.patch
@@ -0,0 +1,169 @@
+From: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
+Subject: [PATCH v5 5/8] mac80211: ath9k: enable GPIO buttons
+
+Enable platform-defined GPIO button support for ath9k device.
+Key poller is activated for attached platform buttons.
+Requires ath9k GPIO chip access.
+
+Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
+---
+ drivers/net/wireless/ath/ath9k/ath9k.h |   16 ++++++
+ drivers/net/wireless/ath/ath9k/gpio.c  |   77 +++++++++++++++++++++++++++++++++
+ drivers/net/wireless/ath/ath9k/init.c  |    2 
+ include/linux/ath9k_platform.h         |    4 +
+ 4 files changed, 99 insertions(+)
+
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -825,6 +825,13 @@ int ath_create_gpio_led(struct ath_softc
+ void ath9k_register_gpio_chip(struct ath_softc *sc);
+ void ath9k_unregister_gpio_chip(struct ath_softc *sc);
+ 
++/******************/
++/*  GPIO Buttons  */
++/******************/
++
++void ath9k_init_buttons(struct ath_softc *sc);
++void ath9k_deinit_buttons(struct ath_softc *sc);
++
+ #else
+ static inline void ath_init_leds(struct ath_softc *sc)
+ {
+@@ -844,6 +851,14 @@ static inline void ath9k_register_gpio_c
+ static inline void ath9k_unregister_gpio_chip(struct ath_softc *sc)
+ {
+ }
++
++static inline void ath9k_init_buttons(struct ath_softc *sc)
++{
++}
++
++static inline void ath9k_deinit_buttons(struct ath_softc *sc)
++{
++}
+ #endif
+ 
+ /************************/
+@@ -1040,6 +1055,7 @@ struct ath_softc {
+ 	const char *led_default_trigger;
+ 	struct list_head leds;
+ 	struct ath9k_gpio_chip *gpiochip;
++	struct platform_device *btnpdev;	/* gpio-keys-polled */
+ #endif
+ 
+ #ifdef CPTCFG_ATH9K_DEBUGFS
+--- a/drivers/net/wireless/ath/ath9k/gpio.c
++++ b/drivers/net/wireless/ath/ath9k/gpio.c
+@@ -24,6 +24,8 @@
+ #ifdef CPTCFG_MAC80211_LEDS
+ 
+ #include <asm-generic/gpio.h>
++#include <linux/platform_device.h>
++#include <linux/gpio_keys.h>
+ 
+ static void ath_led_brightness(struct led_classdev *led_cdev,
+ 			       enum led_brightness brightness)
+@@ -159,7 +161,7 @@ void ath_init_leds(struct ath_softc *sc)
+ 	ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger,
+ 			    !sc->sc_ah->config.led_active_high);
+ 
+-	if (!pdata)
++	if (!pdata || !pdata->leds || !pdata->num_leds)
+ 		return;
+ 
+ 	for (i = 0; i < pdata->num_leds; i++)
+@@ -307,6 +309,63 @@ void ath9k_unregister_gpio_chip(struct a
+ 	sc->gpiochip = NULL;
+ }
+ 
++/******************/
++/*  GPIO Buttons  */
++/******************/
++
++/* add GPIO buttons */
++void ath9k_init_buttons(struct ath_softc *sc)
++{
++	struct ath9k_platform_data *pdata = sc->dev->platform_data;
++	struct platform_device *pdev;
++	struct gpio_keys_platform_data gkpdata;
++	struct gpio_keys_button *bt;
++	int i;
++
++	if (!sc->gpiochip)
++		return;
++
++	if (!pdata || !pdata->btns || !pdata->num_btns)
++		return;
++
++	bt = devm_kmemdup(sc->dev, pdata->btns,
++			  pdata->num_btns * sizeof(struct gpio_keys_button),
++			  GFP_KERNEL);
++	if (!bt)
++		return;
++
++	for (i = 0; i < pdata->num_btns; i++) {
++		ath9k_hw_cfg_gpio_input(sc->sc_ah, pdata->btns[i].gpio);
++		bt[i].gpio = sc->gpiochip->gchip.base + pdata->btns[i].gpio;
++	}
++
++	memset(&gkpdata, 0, sizeof(struct gpio_keys_platform_data));
++	gkpdata.buttons = bt;
++	gkpdata.nbuttons = pdata->num_btns;
++	gkpdata.poll_interval = pdata->btn_poll_interval;
++
++	pdev = platform_device_register_data(sc->dev, "gpio-keys-polled",
++					     PLATFORM_DEVID_AUTO, &gkpdata,
++					     sizeof(gkpdata));
++	if (!IS_ERR_OR_NULL(pdev))
++		sc->btnpdev = pdev;
++	else {
++		sc->btnpdev = NULL;
++		devm_kfree(sc->dev, bt);
++	}
++}
++
++/* remove GPIO buttons */
++void ath9k_deinit_buttons(struct ath_softc *sc)
++{
++	if (!sc->gpiochip || !sc->btnpdev)
++		return;
++
++	platform_device_unregister(sc->btnpdev);
++
++	sc->btnpdev = NULL;
++}
++
+ #endif
+ 
+ /*******************/
+--- a/drivers/net/wireless/ath/ath9k/init.c
++++ b/drivers/net/wireless/ath/ath9k/init.c
+@@ -977,6 +977,7 @@ int ath9k_init_device(u16 devid, struct
+ 
+ 	ath9k_register_gpio_chip(sc);
+ 	ath_init_leds(sc);
++	ath9k_init_buttons(sc);
+ 	ath_start_rfkill_poll(sc);
+ 
+ 	return 0;
+@@ -1022,6 +1023,7 @@ void ath9k_deinit_device(struct ath_soft
+ 	ath9k_ps_wakeup(sc);
+ 
+ 	wiphy_rfkill_stop_polling(sc->hw->wiphy);
++	ath9k_deinit_buttons(sc);
+ 	ath_deinit_leds(sc);
+ 	ath9k_unregister_gpio_chip(sc);
+ 
+--- a/include/linux/ath9k_platform.h
++++ b/include/linux/ath9k_platform.h
+@@ -46,6 +46,10 @@ struct ath9k_platform_data {
+ 	int num_leds;
+ 	const struct gpio_led *leds;
+ 	const char *led_name;
++
++	unsigned num_btns;
++	const struct gpio_keys_button *btns;
++	unsigned btn_poll_interval;
+ };
+ 
+ #endif /* _LINUX_ATH9K_PLATFORM_H */
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.c b/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.c
index bf80d4d030..20bb06e486 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.c
@@ -93,6 +93,20 @@ __init void ap9x_pci_setup_wmac_leds(unsigned wmac, struct gpio_led *leds,
 	}
 }
 
+__init void ap9x_pci_setup_wmac_btns(unsigned wmac,
+				     struct gpio_keys_button *btns,
+				     unsigned num_btns, unsigned poll_interval)
+{
+	struct ath9k_platform_data *ap9x_wmac_data;
+
+	if (!(ap9x_wmac_data = ap9x_pci_get_wmac_data(wmac)))
+		return;
+
+	ap9x_wmac_data->btns = btns;
+	ap9x_wmac_data->num_btns = num_btns;
+	ap9x_wmac_data->btn_poll_interval = poll_interval;
+}
+
 static int ap91_pci_plat_dev_init(struct pci_dev *dev)
 {
 	switch (PCI_SLOT(dev->devfn)) {
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.h b/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.h
index dcfe541a1d..d7c018565e 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.h
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-ap9x-pci.h
@@ -12,6 +12,7 @@
 #define _ATH79_DEV_AP9X_PCI_H
 
 struct gpio_led;
+struct gpio_keys_button;
 struct ath9k_platform_data;
 
 #if defined(CONFIG_ATH79_DEV_AP9X_PCI)
@@ -20,6 +21,8 @@ void ap9x_pci_setup_wmac_gpio(unsigned wmac, u32 mask, u32 val);
 void ap9x_pci_setup_wmac_leds(unsigned wmac, struct gpio_led *leds,
 			      int num_leds);
 void ap9x_pci_setup_wmac_led_name(unsigned wmac, const char *led_name);
+void ap9x_pci_setup_wmac_btns(unsigned wmac, struct gpio_keys_button *btns,
+			      unsigned num_btns, unsigned poll_interval);
 struct ath9k_platform_data *ap9x_pci_get_wmac_data(unsigned wmac);
 
 void ap91_pci_init(u8 *cal_data, u8 *mac_addr);
@@ -36,6 +39,10 @@ static inline void ap9x_pci_setup_wmac_leds(unsigned wmac,
 					    int num_leds) {}
 static inline void ap9x_pci_setup_wmac_led_name(unsigned wmac,
 						const char *led_name) {}
+static inline void ap9x_pci_setup_wmac_btns(unsigned wmac,
+					    struct gpio_keys_button *btns,
+					    unsigned num_btns,
+					    unsigned poll_interval) {}
 static inline struct ath9k_platform_data *ap9x_pci_get_wmac_data(unsigned wmac)
 {
 	return NULL;
diff --git a/target/linux/generic/files/include/linux/ath9k_platform.h b/target/linux/generic/files/include/linux/ath9k_platform.h
index 823e5acf46..e543a64060 100644
--- a/target/linux/generic/files/include/linux/ath9k_platform.h
+++ b/target/linux/generic/files/include/linux/ath9k_platform.h
@@ -46,6 +46,10 @@ struct ath9k_platform_data {
 	int num_leds;
 	const struct gpio_led *leds;
 	const char *led_name;
+
+	unsigned num_btns;
+	const struct gpio_keys_button *btns;
+	unsigned btn_poll_interval;
 };
 
 #endif /* _LINUX_ATH9K_PLATFORM_H */