Commit 6da86df3 authored by Vaibhav Hiremath's avatar Vaibhav Hiremath Committed by Greg Kroah-Hartman
Browse files

greybus: arche-platform: Export gpio (reset & sys_boot) to user 



In order to allow user to flash the firmware to,

SVC:
user need to assert the reset first, set sysboot pin and
deassert reset. And then issue a flashing command.

And APB:
User need to assert the reset first, and then issue flashing
command.

So this patch exports the gpio's to user.

Signed-off-by: default avatarVaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 1f67ee5c

drivers/staging/greybus/arche-apb-ctrl.c

+14 −0
Original line number Diff line number Diff line
@@ -71,6 +71,17 @@ static inline void deassert_gpio(unsigned int gpio) 
	gpio_set_value(gpio, 0);

}



/* Export gpio's to user space */

static void export_gpios(struct arche_apb_ctrl_drvdata *apb)

{

	gpio_export(apb->resetn_gpio, false);

}



static void unexport_gpios(struct arche_apb_ctrl_drvdata *apb)

{

	gpio_unexport(apb->resetn_gpio);

}



static irqreturn_t apb_ctrl_wake_detect_irq(int irq, void *devid)

{

	struct arche_apb_ctrl_drvdata *apb = devid;
@@ -328,6 +339,8 @@ int arche_apb_ctrl_probe(struct platform_device *pdev) 


	assert_gpio(apb->resetn_gpio);



	export_gpios(apb);



	dev_info(&pdev->dev, "Device registered successfully\n");

	return 0;
@@ -344,6 +357,7 @@ int arche_apb_ctrl_remove(struct platform_device *pdev) 
		apb_ctrl_cleanup(apb);



	platform_set_drvdata(pdev, NULL);

	unexport_gpios(apb);



	return 0;

}

drivers/staging/greybus/arche-platform.c

+16 −0
Original line number Diff line number Diff line
@@ -45,6 +45,19 @@ static inline void svc_reset_onoff(unsigned int gpio, bool onoff) 
	gpio_set_value(gpio, onoff);

}



/* Export gpio's to user space */

static void export_gpios(struct arche_platform_drvdata *arche_pdata)

{

	gpio_export(arche_pdata->svc_reset_gpio, false);

	gpio_export(arche_pdata->svc_sysboot_gpio, false);

}



static void unexport_gpios(struct arche_platform_drvdata *arche_pdata)

{

	gpio_unexport(arche_pdata->svc_reset_gpio);

	gpio_unexport(arche_pdata->svc_sysboot_gpio);

}



static void arche_platform_cleanup(struct arche_platform_drvdata *arche_pdata)

{

	/* As part of exit, put APB back in reset state */
@@ -141,6 +154,8 @@ static int arche_platform_probe(struct platform_device *pdev) 
	arche_pdata->num_apbs = of_get_child_count(np);

	dev_dbg(dev, "Number of APB's available - %d\n", arche_pdata->num_apbs);



	export_gpios(arche_pdata);



	/* probe all childs here */

	ret = of_platform_populate(np, NULL, NULL, dev);

	if (ret)
@@ -169,6 +184,7 @@ static int arche_platform_remove(struct platform_device *pdev) 
		arche_platform_cleanup(arche_pdata);



	platform_set_drvdata(pdev, NULL);

	unexport_gpios(arche_pdata);



	return 0;

}

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