[PATCH v3 3/3] mwifiex: parse host wakeup configuration from device tree

Amitkumar Karwar
2016-02-08T10:15:28Z

From: Xinming Hu <huxm-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>

This patch implement a framework for board specific wakeup.
driver parse irq/gpio number from device tree, corresponding
resources will be allocated, and used for host suspend/resume.
driver private binding file is also updated in the patch.

Signed-off-by: Xinming Hu <huxm-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Amitkumar Karwar <akarwar-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
---
v2: Guarded ".pm = mwifiex_plt_pm_ops" line with CONFIG_PM_SLEEP
---
Documentation/devicetree/bindings/mwifiex.txt | 10 +++
.../net/wireless/marvell/mwifiex/platform_drv.c | 95 ++++++++++++++++++++++
2 files changed, 105 insertions(+)

diff --git a/Documentation/devicetree/bindings/mwifiex.txt b/Documentation/devicetree/bindings/mwifiex.txt
index 367c97e..68919c7 100644
--- a/Documentation/devicetree/bindings/mwifiex.txt
+++ b/Documentation/devicetree/bindings/mwifiex.txt
@@ -14,6 +14,11 @@ Optional properties:
- mwifiex,chip-gpio : Chip's wakeup gpio pin number. This needs to be downloaded
to to firmware. Chip notifies wifi wakeup signal to SOC
through this pin.
+ - interrupt-parent: phandle of the parent interrupt controller
+ - interrupts : interrupt number to the cpu
+ - gpios: specify SOC's wakeup GPIO
+ - pinctrl-names : a pinctrl state named "default" must be defined
+ - pinctrl-0 : pin control group to be used for this controller

Example:

@@ -27,5 +32,10 @@ mwifiex {
mwifiex,caldata_00_txpwrlimit_2g_cfg_set = /bits/ 8 <
0x01 0x00 0x06 0x00 0x08 0x02 0x89 0x01 ...>;
mwifiex,chip-gpio = <3>;
+ interrupt-parent = <&pio>;
+ interrupts = <38 IRQ_TYPE_LEVEL_LOW>;
+ gpios = <&pio 38 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&wake_pins>;
};

diff --git a/drivers/net/wireless/marvell/mwifiex/platform_drv.c b/drivers/net/wireless/marvell/mwifiex/platform_drv.c
index f64a12a..2eb813c 100644
--- a/drivers/net/wireless/marvell/mwifiex/platform_drv.c
+++ b/drivers/net/wireless/marvell/mwifiex/platform_drv.c
@@ -18,9 +18,63 @@

struct platform_device *mwifiex_plt_dev;

+struct mwifiex_wake_dev {
+ struct device *dev;
+ int irq_wifi;
+ bool wake_by_wifi;
+};
+
+static irqreturn_t mwifiex_wake_irq_wifi(int irq, void *priv)
+{
+ struct mwifiex_wake_dev *ctx = priv;
+
+ if (ctx->irq_wifi >= 0) {
+ ctx->wake_by_wifi = true;
+ disable_irq_nosync(ctx->irq_wifi);
+ }
+
+ return IRQ_HANDLED;
+}
+
static int mwifiex_plt_probe(struct platform_device *pdev)
{
+ int ret;
+ struct mwifiex_wake_dev *ctx;
+ int gpio;
+
mwifiex_plt_dev = pdev;
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->dev = &pdev->dev;
+ ctx->irq_wifi = platform_get_irq(pdev, 0);
+ if (ctx->irq_wifi < 0)
+ dev_err(&pdev->dev, "Failed to get irq_wifi\n");
+
+ gpio = of_get_gpio(pdev->dev.of_node, 0);
+ if (gpio_is_valid(gpio))
+ gpio_direction_input(gpio);
+ else
+ dev_err(&pdev->dev, "gpio wifi is invalid\n");
+
+ if (ctx->irq_wifi >= 0) {
+ ret = devm_request_irq(&pdev->dev, ctx->irq_wifi,
+ mwifiex_wake_irq_wifi,
+ IRQF_TRIGGER_LOW,
+ "wifi_wake", ctx);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to request irq_wifi %d (%d)\n",
+ ctx->irq_wifi, ret);
+ return -EINVAL;
+ }
+ disable_irq(ctx->irq_wifi);
+ }
+
+ platform_set_drvdata(pdev, ctx);
+
return 0;
}

@@ -30,6 +84,44 @@ static int mwifiex_plt_remove(struct platform_device *pdev)
return 0;
}

+#ifdef CONFIG_PM_SLEEP
+static int mwifiex_plt_suspend(struct device *dev)
+{
+ struct mwifiex_wake_dev *ctx = dev_get_drvdata(dev);
+ int ret;
+
+ if (ctx->irq_wifi >= 0) {
+ ctx->wake_by_wifi = false;
+ enable_irq(ctx->irq_wifi);
+ ret = enable_irq_wake(ctx->irq_wifi);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mwifiex_plt_resume(struct device *dev)
+{
+ struct mwifiex_wake_dev *ctx = dev_get_drvdata(dev);
+ int ret;
+
+ if (ctx->irq_wifi >= 0) {
+ ret = disable_irq_wake(ctx->irq_wifi);
+ if (!ctx->wake_by_wifi)
+ disable_irq(ctx->irq_wifi);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops mwifiex_plt_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mwifiex_plt_suspend, mwifiex_plt_resume)
+};
+#endif /* CONFIG_PM_SLEEP */
+
static const struct of_device_id mwifiex_dt_match[] = {
{
.compatible = "marvell,mwifiex",
@@ -45,6 +137,9 @@ static struct platform_driver mwifiex_platform_driver = {
.driver = {
.name = "mwifiex_plt",
.of_match_table = mwifiex_dt_match,
+#ifdef CONFIG_PM_SLEEP
+ .pm = &mwifiex_plt_pm_ops,
+#endif
}
};

--
1.8.1.4