wl1251: make irq handling interface specific

In SDIO, the host driver requests the IRQ and invokes a callback to the
card driver.  This differs from SPI, so the relevant code needs to be
interface-specific.  This patch pushes the irq code down into _spi.c
and _sdio.c, and adds enable/disable callbacks.

This fixes the following warning:

[  566.343887] ------------[ cut here ]------------
[  566.349105] WARNING: at kernel/irq/manage.c:222 __enable_irq+0x3c/0x6c()
[  566.356735] Unbalanced enable for IRQ 0
[  566.361099] Modules linked in: msm_wifi wl12xx_sdio wl12xx mac80211 cfg80211 rfkill_backport lib80211_crypt_ccmp lib80211_crypt_wep lib80211_crypt_tkip lib80211
[  566.381240] [<c025acec>] (dump_stack+0x0/0x14) from [<c004b610>] (warn_slowpath+0x70/0x8c)
[  566.391860] [<c004b5a0>] (warn_slowpath+0x0/0x8c) from [<c0077c10>] (__enable_irq+0x3c/0x6c)
[  566.402572]  r3:00000000 r2:c02cad13
[  566.407516]  r7:00001002 r6:00000000 r5:c0310be4 r4:c0310be4
[  566.415786] [<c0077bd4>] (__enable_irq+0x0/0x6c) from [<c0077fd0>] (enable_irq+0x38/0x64)
[  566.425826]  r5:c0310be4 r4:a0000013
[  566.430709] [<c0077f98>] (enable_irq+0x0/0x64) from [<bf0dfa78>] (wl12xx_boot_run_firmware+0xfc/0x170 [wl12xx])
[  566.442947]  r7:00001002 r6:c440a9fc r5:00000072 r4:c440a9e0
[  566.450851] [<bf0df97c>] (wl12xx_boot_run_firmware+0x0/0x170 [wl12xx]) from [<bf0e05f0>] (wl1251_boot+0xd4/0x108 [wl12xx])
[  566.464492]  r5:00000000 r4:c440a9e0
[  566.469466] [<bf0e051c>] (wl1251_boot+0x0/0x108 [wl12xx]) from [<bf0dd27c>] (wl12xx_op_start+0x54/0xb8 [wl12xx])
[  566.482162]  r5:00000000 r4:c440a9e0
[  566.487472] [<bf0dd228>] (wl12xx_op_start+0x0/0xb8 [wl12xx]) from [<bf0b96dc>] (ieee80211_open+0x2dc/0x720 [mac80211])
[  566.500594]  r7:00001002 r6:c4950800 r5:c440a220 r4:00000000
[  566.508865] [<bf0b9400>] (ieee80211_open+0x0/0x720 [mac80211]) from [<c01f1edc>] (dev_open+0x9c/0xfc)
[  566.520705] [<c01f1e40>] (dev_open+0x0/0xfc) from [<c01f17dc>] (dev_change_flags+0x98/0x170)
[  566.531417]  r5:00000041 r4:c4950800
[  566.536330] [<c01f1744>] (dev_change_flags+0x0/0x170) from [<c023041c>] (devinet_ioctl+0x3a8/0x784)
[  566.547683]  r7:c128e380 r6:00000001 r5:00008914 r4:00000000
[  566.555587] [<c0230074>] (devinet_ioctl+0x0/0x784) from [<c02318cc>] (inet_ioctl+0xdc/0x114)
[  566.566299] [<c02317f0>] (inet_ioctl+0x0/0x114) from [<c01e1a60>] (sock_ioctl+0x1f0/0x248)
[  566.576827]  r5:00008914 r4:c572c1a0
[  566.581771] [<c01e1870>] (sock_ioctl+0x0/0x248) from [<c00b23a0>] (vfs_ioctl+0x34/0x94)
[  566.592086]  r7:c572c1a0 r6:bee497e8 r5:00008914 r4:c572c1a0
[  566.599990] [<c00b236c>] (vfs_ioctl+0x0/0x94) from [<c00b2a28>] (do_vfs_ioctl+0x52c/0x584)
[  566.610549]  r7:c572c1a0 r6:00008914 r5:c572c1a0 r4:c3201228
[  566.618453] [<c00b24fc>] (do_vfs_ioctl+0x0/0x584) from [<c00b2ac0>] (sys_ioctl+0x40/0x64)
[  566.628890] [<c00b2a80>] (sys_ioctl+0x0/0x64) from [<c0021da0>] (ret_fast_syscall+0x0/0x2c)
[  566.639541]  r7:00000036 r6:00000000 r5:00000004 r4:001a11f3
[  566.647445] ---[ end trace 15c26ef7dd5e7b03 ]---

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251.h

@@ -285,6 +285,8 @@ struct wl1251_if_operations {
 	void (*read)(struct wl1251 *wl, int addr, void *buf, size_t len);
 	void (*write)(struct wl1251 *wl, int addr, void *buf, size_t len);
 	void (*reset)(struct wl1251 *wl);
+	void (*enable_irq)(struct wl1251 *wl);
+	void (*disable_irq)(struct wl1251 *wl);
 };
 
 struct wl1251 {
@@ -404,10 +406,11 @@ struct wl1251 {
 int wl1251_plt_start(struct wl1251 *wl);
 int wl1251_plt_stop(struct wl1251 *wl);
 
-irqreturn_t wl1251_irq(int irq, void *cookie);
 struct ieee80211_hw *wl1251_alloc_hw(void);
 int wl1251_free_hw(struct wl1251 *wl);
 int wl1251_init_ieee80211(struct wl1251 *wl);
+void wl1251_enable_interrupts(struct wl1251 *wl);
+void wl1251_disable_interrupts(struct wl1251 *wl);
 
 #define DEFAULT_HW_GEN_MODULATION_TYPE    CCK_LONG /* Long Preamble */
 #define DEFAULT_HW_GEN_TX_RATE          RATE_2MBPS

drivers/net/wireless/wl12xx/wl1251_boot.c

@@ -29,11 +29,6 @@
 #include "wl1251_spi.h"
 #include "wl1251_event.h"
 
-static void wl1251_boot_enable_interrupts(struct wl1251 *wl)
-{
-	enable_irq(wl->irq);
-}
-
 void wl1251_boot_target_enable_interrupts(struct wl1251 *wl)
 {
 	wl1251_reg_write32(wl, ACX_REG_INTERRUPT_MASK, ~(wl->intr_mask));
@@ -278,7 +273,7 @@ int wl1251_boot_run_firmware(struct wl1251 *wl)
 	 */
 
 	/* enable gpio interrupts */
-	wl1251_boot_enable_interrupts(wl);
+	wl1251_enable_interrupts(wl);
 
 	wl->chip.op_target_enable_interrupts(wl);
 

drivers/net/wireless/wl12xx/wl1251_main.c

@@ -42,9 +42,14 @@
 #include "wl1251_init.h"
 #include "wl1251_debugfs.h"
 
-static void wl1251_disable_interrupts(struct wl1251 *wl)
+void wl1251_enable_interrupts(struct wl1251 *wl)
 {
-	disable_irq(wl->irq);
+	wl->if_ops->enable_irq(wl);
+}
+
+void wl1251_disable_interrupts(struct wl1251 *wl)
+{
+	wl->if_ops->disable_irq(wl);
 }
 
 static void wl1251_power_off(struct wl1251 *wl)
@@ -57,20 +62,6 @@ static void wl1251_power_on(struct wl1251 *wl)
 	wl->set_power(true);
 }
 
-irqreturn_t wl1251_irq(int irq, void *cookie)
-{
-	struct wl1251 *wl;
-
-	wl1251_debug(DEBUG_IRQ, "IRQ");
-
-	wl = cookie;
-
-	schedule_work(&wl->irq_work);
-
-	return IRQ_HANDLED;
-}
-EXPORT_SYMBOL_GPL(wl1251_irq);
-
 static int wl1251_fetch_firmware(struct wl1251 *wl)
 {
 	const struct firmware *fw;
@@ -1280,7 +1271,6 @@ int wl1251_free_hw(struct wl1251 *wl)
 
 	wl1251_debugfs_exit(wl);
 
-	free_irq(wl->irq, wl);
 	kfree(wl->target_mem_map);
 	kfree(wl->data_path);
 	kfree(wl->fw);

drivers/net/wireless/wl12xx/wl1251_sdio.c

@@ -50,7 +50,12 @@ static struct sdio_func *wl_to_func(struct wl1251 *wl)
 
 static void wl1251_sdio_interrupt(struct sdio_func *func)
 {
-	wl1251_irq(0, sdio_get_drvdata(func));
+	struct wl1251 *wl = sdio_get_drvdata(func);
+
+	wl1251_debug(DEBUG_IRQ, "IRQ");
+
+	/* FIXME should be synchronous for sdio */
+	schedule_work(&wl->irq_work);
 }
 
 static const struct sdio_device_id wl1251_devices[] = {
@@ -88,6 +93,24 @@ void wl1251_sdio_reset(struct wl1251 *wl)
 {
 }
 
+static void wl1251_sdio_enable_irq(struct wl1251 *wl)
+{
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	sdio_claim_irq(func, wl1251_sdio_interrupt);
+	sdio_release_host(func);
+}
+
+static void wl1251_sdio_disable_irq(struct wl1251 *wl)
+{
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	sdio_release_irq(func);
+	sdio_release_host(func);
+}
+
 void wl1251_sdio_set_power(bool enable)
 {
 }
@@ -96,6 +119,8 @@ struct wl1251_if_operations wl1251_sdio_ops = {
 	.read = wl1251_sdio_read,
 	.write = wl1251_sdio_write,
 	.reset = wl1251_sdio_reset,
+	.enable_irq = wl1251_sdio_enable_irq,
+	.disable_irq = wl1251_sdio_disable_irq,
 };
 
 int wl1251_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
@@ -124,21 +149,14 @@ int wl1251_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
 
 	sdio_release_host(func);
 	ret = wl1251_init_ieee80211(wl);
-	sdio_claim_host(func);
 	if (ret)
 		goto disable;
 
-	ret = sdio_claim_irq(func, wl1251_sdio_interrupt);
-	if (ret)
-		goto no_irq;
-
-	sdio_release_host(func);
 	sdio_set_drvdata(func, wl);
 	return ret;
 
-no_irq:
-	wl1251_free_hw(wl);
 disable:
+	sdio_claim_host(func);
 	sdio_disable_func(func);
 release:
 	sdio_release_host(func);

drivers/net/wireless/wl12xx/wl1251_spi.c

@@ -31,6 +31,19 @@
 #include "reg.h"
 #include "wl1251_spi.h"
 
+static irqreturn_t wl1251_irq(int irq, void *cookie)
+{
+	struct wl1251 *wl;
+
+	wl1251_debug(DEBUG_IRQ, "IRQ");
+
+	wl = cookie;
+
+	schedule_work(&wl->irq_work);
+
+	return IRQ_HANDLED;
+}
+
 static struct spi_device *wl_to_spi(struct wl1251 *wl)
 {
 	return wl->if_priv;
@@ -193,10 +206,22 @@ static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
 	wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
 }
 
+static void wl1251_spi_enable_irq(struct wl1251 *wl)
+{
+	return enable_irq(wl->irq);
+}
+
+static void wl1251_spi_disable_irq(struct wl1251 *wl)
+{
+	return disable_irq(wl->irq);
+}
+
 static const struct wl1251_if_operations wl1251_spi_ops = {
 	.read = wl1251_spi_read,
 	.write = wl1251_spi_write,
 	.reset = wl1251_spi_reset_wake,
+	.enable_irq = wl1251_spi_enable_irq,
+	.disable_irq = wl1251_spi_disable_irq,
 };
 
 static int __devinit wl1251_spi_probe(struct spi_device *spi)
@@ -274,6 +299,7 @@ static int __devexit wl1251_spi_remove(struct spi_device *spi)
 {
 	struct wl1251 *wl = dev_get_drvdata(&spi->dev);
 
+	free_irq(wl->irq, wl);
 	wl1251_free_hw(wl);
 
 	return 0;