[PATCH v4 3/8] wireless: wl1271: add platform driver to get board data

[Ohad Ben-Cohen]

Dynamically create and register a platform driver, that will
be used to to receive board-specific information like irq and
reference clock numbers.

The driver is created dynamically in order to avoid the 1-device
limitation of a fixed platform driver name.

Signed-off-by: Ohad Ben-Cohen <ohad at wizery.com>
---
 drivers/net/wireless/wl12xx/wl1271.h      |   12 ++++
 drivers/net/wireless/wl12xx/wl1271_sdio.c |  103 +++++++++++++++++++++++++++--
 2 files changed, 108 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h
index faa5925..013eabb 100644
--- a/drivers/net/wireless/wl12xx/wl1271.h
+++ b/drivers/net/wireless/wl12xx/wl1271.h
@@ -31,6 +31,7 @@
 #include <linux/list.h>
 #include <linux/bitops.h>
 #include <net/mac80211.h>
+#include <linux/platform_device.h>
 
 #include "wl1271_conf.h"
 #include "wl1271_ini.h"
@@ -319,8 +320,19 @@ struct wl1271_if_operations {
 	void (*disable_irq)(struct wl1271 *wl);
 };
 
+/* exact size needed for "wl1271_plat.x" */
+#define WL12XX_PLAT_NAME_LEN 14
+
+struct wl12xx_plat_instance {
+	struct platform_driver pdriver;
+	char name[WL12XX_PLAT_NAME_LEN];
+	struct wl12xx_platform_data *pdata;
+	struct completion data_ready;
+};
+
 struct wl1271 {
 	struct platform_device *plat_dev;
+	struct wl12xx_plat_instance *pinstance;
 	struct ieee80211_hw *hw;
 	bool mac80211_registered;
 
diff --git a/drivers/net/wireless/wl12xx/wl1271_sdio.c b/drivers/net/wireless/wl12xx/wl1271_sdio.c
index c41293a..68b512b 100644
--- a/drivers/net/wireless/wl12xx/wl1271_sdio.c
+++ b/drivers/net/wireless/wl12xx/wl1271_sdio.c
@@ -28,7 +28,11 @@
 #include <linux/mmc/sdio_func.h>
 #include <linux/mmc/sdio_ids.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/wl12xx.h>
 #include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/completion.h>
 
 #include "wl1271.h"
 #include "wl12xx_80211.h"
@@ -182,10 +186,84 @@ static struct wl1271_if_operations sdio_ops = {
 	.disable_irq	= wl1271_sdio_disable_interrupts
 };
 
+static int wl1271_plat_probe(struct platform_device *pdev)
+{
+	struct wl12xx_platform_data *pdata;
+	struct platform_driver *pdriver;
+	struct wl12xx_plat_instance *pinstance;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		wl1271_error("no platform data");
+		return -ENODEV;
+	}
+
+	pdriver = container_of(pdev->dev.driver, struct platform_driver,
+								driver);
+	pinstance = container_of(pdriver, struct wl12xx_plat_instance, pdriver);
+
+	pinstance->pdata = pdata;
+
+	complete(&pinstance->data_ready);
+
+	return 0;
+}
+
+static struct wl12xx_platform_data *wl1271_get_data(struct wl1271 *wl, int id)
+{
+	int ret;
+	struct wl12xx_plat_instance *pinstance;
+
+	#define WL1271_PLAT_NAME "wl1271_plat.%d"
+
+	pinstance = kzalloc(sizeof(*pinstance), GFP_KERNEL);
+	if (!pinstance)
+		return ERR_PTR(-ENOMEM);
+
+	init_completion(&pinstance->data_ready);
+
+	pinstance->pdriver.probe = wl1271_plat_probe;
+
+	ret = snprintf(pinstance->name, sizeof(pinstance->name),
+						WL1271_PLAT_NAME, id);
+	if (ret >= WL12XX_PLAT_NAME_LEN) {
+		wl1271_error("truncated plat drv name\n");
+		goto out_free;
+	}
+
+	pinstance->pdriver.driver.name = pinstance->name;
+	pinstance->pdriver.driver.owner = THIS_MODULE;
+
+	ret = platform_driver_register(&pinstance->pdriver);
+	if (ret < 0) {
+		wl1271_error("failed to register plat driver: %d", ret);
+		goto out_free;
+	}
+
+	ret = wait_for_completion_interruptible_timeout(&pinstance->data_ready,
+						msecs_to_jiffies(15000));
+	if (ret <= 0) {
+		wl1271_error("can't get platform device (%d)", ret);
+		ret = (ret == 0 ? -EAGAIN : ret);
+		goto unreg;
+	}
+
+	wl->pinstance = pinstance;
+
+	return pinstance->pdata;
+
+unreg:
+	platform_driver_unregister(&pinstance->pdriver);
+out_free:
+	kfree(pinstance);
+	return ERR_PTR(ret);
+}
+
 static int __devinit wl1271_probe(struct sdio_func *func,
 				  const struct sdio_device_id *id)
 {
 	struct ieee80211_hw *hw;
+	struct wl12xx_platform_data *wlan_data;
 	struct wl1271 *wl;
 	int ret;
 
@@ -205,17 +283,24 @@ static int __devinit wl1271_probe(struct sdio_func *func,
 	/* Grab access to FN0 for ELP reg. */
 	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 
+	wlan_data = wl1271_get_data(wl, func->card->host->index);
+	if (IS_ERR(wlan_data)) {
+		ret = PTR_ERR(wlan_data);
+		wl1271_error("missing wlan data (needed for irq/ref_clk)!");
+		goto out_free;
+	}
+
 	wl->irq = gpio_to_irq(RX71_WL1271_IRQ_GPIO);
 	if (wl->irq < 0) {
 		ret = wl->irq;
 		wl1271_error("could not get irq!");
-		goto out_free;
+		goto put_data;
 	}
 
 	ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
 	if (ret < 0) {
 		wl1271_error("request_irq() failed: %d", ret);
-		goto out_free;
+		goto put_data;
 	}
 
 	set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
@@ -236,13 +321,13 @@ static int __devinit wl1271_probe(struct sdio_func *func,
 
 	return 0;
 
- out_irq:
+out_irq:
 	free_irq(wl->irq, wl);
-
-
- out_free:
+put_data:
+	platform_driver_unregister(&wl->pinstance->pdriver);
+	kfree(wl->pinstance);
+out_free:
 	wl1271_free_hw(wl);
-
 	return ret;
 }
 
@@ -253,6 +338,10 @@ static void __devexit wl1271_remove(struct sdio_func *func)
 	free_irq(wl->irq, wl);
 
 	wl1271_unregister_hw(wl);
+
+	platform_driver_unregister(&wl->pinstance->pdriver);
+	kfree(wl->pinstance);
+
 	wl1271_free_hw(wl);
 }
 
-- 
1.7.0.4