drivers/usb/misc/brcmstb-usb-pinmap.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2020, Broadcom */

 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/kernel.h>
 #include <linux/kdebug.h>
 #include <linux/gpio/consumer.h>

 struct out_pin {
 	u32 enable_mask;
 	u32 value_mask;
 	u32 changed_mask;
 	u32 clr_changed_mask;
 	struct gpio_desc *gpiod;
 	const char *name;
 };

 struct in_pin {
 	u32 enable_mask;
 	u32 value_mask;
 	struct gpio_desc *gpiod;
 	const char *name;
 	struct brcmstb_usb_pinmap_data *pdata;
 };

 struct brcmstb_usb_pinmap_data {
 	void __iomem *regs;
 	int in_count;
 	struct in_pin *in_pins;
 	int out_count;
 	struct out_pin *out_pins;
 };


 static void pinmap_set(void __iomem *reg, u32 mask)
 {
 	u32 val;

 	val = readl(reg);
 	val |= mask;
 	writel(val, reg);
 }

 static void pinmap_unset(void __iomem *reg, u32 mask)
 {
 	u32 val;

 	val = readl(reg);
 	val &= ~mask;
 	writel(val, reg);
 }

 static void sync_in_pin(struct in_pin *pin)
 {
 	u32 val;

 	val = gpiod_get_value(pin->gpiod);
 	if (val)
 		pinmap_set(pin->pdata->regs, pin->value_mask);
 	else
 		pinmap_unset(pin->pdata->regs, pin->value_mask);
 }

 /*
  * Interrupt from override register, propagate from override bit
  * to GPIO.
  */
 static irqreturn_t brcmstb_usb_pinmap_ovr_isr(int irq, void *dev_id)
 {
 	struct brcmstb_usb_pinmap_data *pdata = dev_id;
 	struct out_pin *pout;
 	u32 val;
 	u32 bit;
 	int x;

 	pr_debug("%s: reg: 0x%x\n", __func__, readl(pdata->regs));
 	pout = pdata->out_pins;
 	for (x = 0; x < pdata->out_count; x++) {
 		val = readl(pdata->regs);
 		if (val & pout->changed_mask) {
 			pinmap_set(pdata->regs, pout->clr_changed_mask);
 			pinmap_unset(pdata->regs, pout->clr_changed_mask);
 			bit = val & pout->value_mask;
 			gpiod_set_value(pout->gpiod, bit ? 1 : 0);
 			pr_debug("%s: %s bit changed state to %d\n",
 				 __func__, pout->name, bit ? 1 : 0);
 		}
 	}
 	return IRQ_HANDLED;
 }

 /*
  * Interrupt from GPIO, propagate from GPIO to override bit.
  */
 static irqreturn_t brcmstb_usb_pinmap_gpio_isr(int irq, void *dev_id)
 {
 	struct in_pin *pin = dev_id;

 	pr_debug("%s: %s pin changed state\n", __func__, pin->name);
 	sync_in_pin(pin);
 	return IRQ_HANDLED;
 }


 static void get_pin_counts(struct device_node *dn, int *in_count,
 			   int *out_count)
 {
 	int in;
 	int out;

 	*in_count = 0;
 	*out_count = 0;
 	in = of_property_count_strings(dn, "brcm,in-functions");
 	if (in < 0)
 		return;
 	out = of_property_count_strings(dn, "brcm,out-functions");
 	if (out < 0)
 		return;
 	*in_count = in;
 	*out_count = out;
 }

 static int parse_pins(struct device *dev, struct device_node *dn,
 		      struct brcmstb_usb_pinmap_data *pdata)
 {
 	struct out_pin *pout;
 	struct in_pin *pin;
 	int index;
 	int res;
 	int x;

 	pin = pdata->in_pins;
 	for (x = 0, index = 0; x < pdata->in_count; x++) {
 		pin->gpiod = devm_gpiod_get_index(dev, "in", x, GPIOD_IN);
 		if (IS_ERR(pin->gpiod)) {
 			dev_err(dev, "Error getting gpio %s\n", pin->name);
 			return PTR_ERR(pin->gpiod);

 		}
 		res = of_property_read_string_index(dn, "brcm,in-functions", x,
 						    &pin->name);
 		if (res < 0) {
 			dev_err(dev, "Error getting brcm,in-functions for %s\n",
 				pin->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
 						 &pin->enable_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 1st brcm,in-masks for %s\n",
 				pin->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
 						 &pin->value_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 2nd brcm,in-masks for %s\n",
 				pin->name);
 			return res;
 		}
 		pin->pdata = pdata;
 		pin++;
 	}
 	pout = pdata->out_pins;
 	for (x = 0, index = 0; x < pdata->out_count; x++) {
 		pout->gpiod = devm_gpiod_get_index(dev, "out", x,
 						   GPIOD_OUT_HIGH);
 		if (IS_ERR(pout->gpiod)) {
 			dev_err(dev, "Error getting gpio %s\n", pin->name);
 			return PTR_ERR(pout->gpiod);
 		}
 		res = of_property_read_string_index(dn, "brcm,out-functions", x,
 						    &pout->name);
 		if (res < 0) {
 			dev_err(dev, "Error getting brcm,out-functions for %s\n",
 				pout->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
 						 &pout->enable_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 1st brcm,out-masks for %s\n",
 				pout->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
 						 &pout->value_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 2nd brcm,out-masks for %s\n",
 				pout->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
 						 &pout->changed_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 3rd brcm,out-masks for %s\n",
 				pout->name);
 			return res;
 		}
 		res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
 						 &pout->clr_changed_mask);
 		if (res < 0) {
 			dev_err(dev, "Error getting 4th out-masks for %s\n",
 				pout->name);
 			return res;
 		}
 		pout++;
 	}
 	return 0;
 }

 static void sync_all_pins(struct brcmstb_usb_pinmap_data *pdata)
 {
 	struct out_pin *pout;
 	struct in_pin *pin;
 	int val;
 	int x;

 	/*
 	 * Enable the override, clear any changed condition and
 	 * propagate the state to the GPIO for all out pins.
 	 */
 	pout = pdata->out_pins;
 	for (x = 0; x < pdata->out_count; x++) {
 		pinmap_set(pdata->regs, pout->enable_mask);
 		pinmap_set(pdata->regs, pout->clr_changed_mask);
 		pinmap_unset(pdata->regs, pout->clr_changed_mask);
 		val = readl(pdata->regs) & pout->value_mask;
 		gpiod_set_value(pout->gpiod, val ? 1 : 0);
 		pout++;
 	}

 	/* sync and enable all in pins. */
 	pin = pdata->in_pins;
 	for (x = 0; x < pdata->in_count; x++) {
 		sync_in_pin(pin);
 		pinmap_set(pdata->regs, pin->enable_mask);
 		pin++;
 	}
 }

 static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev)
 {
 	struct device_node *dn = pdev->dev.of_node;
 	struct brcmstb_usb_pinmap_data *pdata;
 	struct in_pin *pin;
 	struct resource *r;
 	int out_count;
 	int in_count;
 	int err;
 	int irq;
 	int x;

 	get_pin_counts(dn, &in_count, &out_count);
 	if ((in_count + out_count) == 0)
 		return -EINVAL;

 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r)
 		return -EINVAL;

 	pdata = devm_kzalloc(&pdev->dev,
 			     sizeof(*pdata) +
 			     (sizeof(struct in_pin) * in_count) +
 			     (sizeof(struct out_pin) * out_count), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	pdata->in_count = in_count;
 	pdata->out_count = out_count;
 	pdata->in_pins = (struct in_pin *)(pdata + 1);
 	pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count);

 	pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (!pdata->regs)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, pdata);

 	err = parse_pins(&pdev->dev, dn, pdata);
 	if (err)
 		return err;

 	sync_all_pins(pdata);

 	if (out_count) {

 		/* Enable interrupt for out pins */
 		irq = platform_get_irq(pdev, 0);
 		if (irq < 0)
 			return irq;
 		err = devm_request_irq(&pdev->dev, irq,
 				       brcmstb_usb_pinmap_ovr_isr,
 				       IRQF_TRIGGER_RISING,
 				       pdev->name, pdata);
 		if (err < 0) {
 			dev_err(&pdev->dev, "Error requesting IRQ\n");
 			return err;
 		}
 	}

 	for (x = 0, pin = pdata->in_pins; x < pdata->in_count; x++, pin++) {
 		irq = gpiod_to_irq(pin->gpiod);
 		if (irq < 0) {
 			dev_err(&pdev->dev, "Error getting IRQ for %s pin\n",
 				pin->name);
 			return irq;
 		}
 		err = devm_request_irq(&pdev->dev, irq,
 				       brcmstb_usb_pinmap_gpio_isr,
 				       IRQF_SHARED | IRQF_TRIGGER_RISING |
 				       IRQF_TRIGGER_FALLING,
 				       pdev->name, pin);
 		if (err < 0) {
 			dev_err(&pdev->dev, "Error requesting IRQ for %s pin\n",
 				pin->name);
 			return err;
 		}
 	}

 	dev_dbg(&pdev->dev, "Driver probe succeeded\n");
 	dev_dbg(&pdev->dev, "In pin count: %d, out pin count: %d\n",
 		pdata->in_count, pdata->out_count);
 	return 0;
 }


 static const struct of_device_id brcmstb_usb_pinmap_of_match[] = {
 	{ .compatible = "brcm,usb-pinmap" },
 	{ },
 };

 static struct platform_driver brcmstb_usb_pinmap_driver = {
 	.driver = {
 		.name	= "brcm-usb-pinmap",
 		.of_match_table = brcmstb_usb_pinmap_of_match,
 	},
 };

 static int __init brcmstb_usb_pinmap_init(void)
 {
 	return platform_driver_probe(&brcmstb_usb_pinmap_driver,
 				     brcmstb_usb_pinmap_probe);
 }

 module_init(brcmstb_usb_pinmap_init);
 MODULE_AUTHOR("Al Cooper <alcooperx@gmail.com>");
 MODULE_DESCRIPTION("Broadcom USB Pinmap Driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/* Copyright (c) 2020, Broadcom */

	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/device.h>
	#include <linux/of.h>
	#include <linux/kernel.h>
	#include <linux/kdebug.h>
	#include <linux/gpio/consumer.h>

	struct out_pin {
	u32 enable_mask;
	u32 value_mask;
	u32 changed_mask;
	u32 clr_changed_mask;
	struct gpio_desc *gpiod;
	const char *name;
	};

	struct in_pin {
	u32 enable_mask;
	u32 value_mask;
	struct gpio_desc *gpiod;
	const char *name;
	struct brcmstb_usb_pinmap_data *pdata;
	};

	struct brcmstb_usb_pinmap_data {
	void __iomem *regs;
	int in_count;
	struct in_pin *in_pins;
	int out_count;
	struct out_pin *out_pins;
	};


	static void pinmap_set(void __iomem *reg, u32 mask)
	{
	u32 val;

	val = readl(reg);
	val \|= mask;
	writel(val, reg);
	}

	static void pinmap_unset(void __iomem *reg, u32 mask)
	{
	u32 val;

	val = readl(reg);
	val &= ~mask;
	writel(val, reg);
	}

	static void sync_in_pin(struct in_pin *pin)
	{
	u32 val;

	val = gpiod_get_value(pin->gpiod);
	if (val)
	pinmap_set(pin->pdata->regs, pin->value_mask);
	else
	pinmap_unset(pin->pdata->regs, pin->value_mask);
	}

	/*
	* Interrupt from override register, propagate from override bit
	* to GPIO.
	*/
	static irqreturn_t brcmstb_usb_pinmap_ovr_isr(int irq, void *dev_id)
	{
	struct brcmstb_usb_pinmap_data *pdata = dev_id;
	struct out_pin *pout;
	u32 val;
	u32 bit;
	int x;

	pr_debug("%s: reg: 0x%x\n", __func__, readl(pdata->regs));
	pout = pdata->out_pins;
	for (x = 0; x < pdata->out_count; x++) {
	val = readl(pdata->regs);
	if (val & pout->changed_mask) {
	pinmap_set(pdata->regs, pout->clr_changed_mask);
	pinmap_unset(pdata->regs, pout->clr_changed_mask);
	bit = val & pout->value_mask;
	gpiod_set_value(pout->gpiod, bit ? 1 : 0);
	pr_debug("%s: %s bit changed state to %d\n",
	__func__, pout->name, bit ? 1 : 0);
	}
	}
	return IRQ_HANDLED;
	}

	/*
	* Interrupt from GPIO, propagate from GPIO to override bit.
	*/
	static irqreturn_t brcmstb_usb_pinmap_gpio_isr(int irq, void *dev_id)
	{
	struct in_pin *pin = dev_id;

	pr_debug("%s: %s pin changed state\n", __func__, pin->name);
	sync_in_pin(pin);
	return IRQ_HANDLED;
	}


	static void get_pin_counts(struct device_node dn, int in_count,
	int *out_count)
	{
	int in;
	int out;

	*in_count = 0;
	*out_count = 0;
	in = of_property_count_strings(dn, "brcm,in-functions");
	if (in < 0)
	return;
	out = of_property_count_strings(dn, "brcm,out-functions");
	if (out < 0)
	return;
	*in_count = in;
	*out_count = out;
	}

	static int parse_pins(struct device dev, struct device_node dn,
	struct brcmstb_usb_pinmap_data *pdata)
	{
	struct out_pin *pout;
	struct in_pin *pin;
	int index;
	int res;
	int x;

	pin = pdata->in_pins;
	for (x = 0, index = 0; x < pdata->in_count; x++) {
	pin->gpiod = devm_gpiod_get_index(dev, "in", x, GPIOD_IN);
	if (IS_ERR(pin->gpiod)) {
	dev_err(dev, "Error getting gpio %s\n", pin->name);
	return PTR_ERR(pin->gpiod);

	}
	res = of_property_read_string_index(dn, "brcm,in-functions", x,
	&pin->name);
	if (res < 0) {
	dev_err(dev, "Error getting brcm,in-functions for %s\n",
	pin->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
	&pin->enable_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 1st brcm,in-masks for %s\n",
	pin->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
	&pin->value_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 2nd brcm,in-masks for %s\n",
	pin->name);
	return res;
	}
	pin->pdata = pdata;
	pin++;
	}
	pout = pdata->out_pins;
	for (x = 0, index = 0; x < pdata->out_count; x++) {
	pout->gpiod = devm_gpiod_get_index(dev, "out", x,
	GPIOD_OUT_HIGH);
	if (IS_ERR(pout->gpiod)) {
	dev_err(dev, "Error getting gpio %s\n", pin->name);
	return PTR_ERR(pout->gpiod);
	}
	res = of_property_read_string_index(dn, "brcm,out-functions", x,
	&pout->name);
	if (res < 0) {
	dev_err(dev, "Error getting brcm,out-functions for %s\n",
	pout->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
	&pout->enable_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 1st brcm,out-masks for %s\n",
	pout->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
	&pout->value_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 2nd brcm,out-masks for %s\n",
	pout->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
	&pout->changed_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 3rd brcm,out-masks for %s\n",
	pout->name);
	return res;
	}
	res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
	&pout->clr_changed_mask);
	if (res < 0) {
	dev_err(dev, "Error getting 4th out-masks for %s\n",
	pout->name);
	return res;
	}
	pout++;
	}
	return 0;
	}

	static void sync_all_pins(struct brcmstb_usb_pinmap_data *pdata)
	{
	struct out_pin *pout;
	struct in_pin *pin;
	int val;
	int x;

	/*
	* Enable the override, clear any changed condition and
	* propagate the state to the GPIO for all out pins.
	*/
	pout = pdata->out_pins;
	for (x = 0; x < pdata->out_count; x++) {
	pinmap_set(pdata->regs, pout->enable_mask);
	pinmap_set(pdata->regs, pout->clr_changed_mask);
	pinmap_unset(pdata->regs, pout->clr_changed_mask);
	val = readl(pdata->regs) & pout->value_mask;
	gpiod_set_value(pout->gpiod, val ? 1 : 0);
	pout++;
	}

	/* sync and enable all in pins. */
	pin = pdata->in_pins;
	for (x = 0; x < pdata->in_count; x++) {
	sync_in_pin(pin);
	pinmap_set(pdata->regs, pin->enable_mask);
	pin++;
	}
	}

	static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev)
	{
	struct device_node *dn = pdev->dev.of_node;
	struct brcmstb_usb_pinmap_data *pdata;
	struct in_pin *pin;
	struct resource *r;
	int out_count;
	int in_count;
	int err;
	int irq;
	int x;

	get_pin_counts(dn, &in_count, &out_count);
	if ((in_count + out_count) == 0)
	return -EINVAL;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r)
	return -EINVAL;

	pdata = devm_kzalloc(&pdev->dev,
	sizeof(*pdata) +
	(sizeof(struct in_pin) * in_count) +
	(sizeof(struct out_pin) * out_count), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	pdata->in_count = in_count;
	pdata->out_count = out_count;
	pdata->in_pins = (struct in_pin *)(pdata + 1);
	pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count);

	pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (!pdata->regs)
	return -ENOMEM;
	platform_set_drvdata(pdev, pdata);

	err = parse_pins(&pdev->dev, dn, pdata);
	if (err)
	return err;

	sync_all_pins(pdata);

	if (out_count) {

	/* Enable interrupt for out pins */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;
	err = devm_request_irq(&pdev->dev, irq,
	brcmstb_usb_pinmap_ovr_isr,
	IRQF_TRIGGER_RISING,
	pdev->name, pdata);
	if (err < 0) {
	dev_err(&pdev->dev, "Error requesting IRQ\n");
	return err;
	}
	}

	for (x = 0, pin = pdata->in_pins; x < pdata->in_count; x++, pin++) {
	irq = gpiod_to_irq(pin->gpiod);
	if (irq < 0) {
	dev_err(&pdev->dev, "Error getting IRQ for %s pin\n",
	pin->name);
	return irq;
	}
	err = devm_request_irq(&pdev->dev, irq,
	brcmstb_usb_pinmap_gpio_isr,
	IRQF_SHARED \| IRQF_TRIGGER_RISING \|
	IRQF_TRIGGER_FALLING,
	pdev->name, pin);
	if (err < 0) {
	dev_err(&pdev->dev, "Error requesting IRQ for %s pin\n",
	pin->name);
	return err;
	}
	}

	dev_dbg(&pdev->dev, "Driver probe succeeded\n");
	dev_dbg(&pdev->dev, "In pin count: %d, out pin count: %d\n",
	pdata->in_count, pdata->out_count);
	return 0;
	}


	static const struct of_device_id brcmstb_usb_pinmap_of_match[] = {
	{ .compatible = "brcm,usb-pinmap" },
	{ },
	};

	static struct platform_driver brcmstb_usb_pinmap_driver = {
	.driver = {
	.name = "brcm-usb-pinmap",
	.of_match_table = brcmstb_usb_pinmap_of_match,
	},
	};

	static int __init brcmstb_usb_pinmap_init(void)
	{
	return platform_driver_probe(&brcmstb_usb_pinmap_driver,
	brcmstb_usb_pinmap_probe);
	}

	module_init(brcmstb_usb_pinmap_init);
	MODULE_AUTHOR("Al Cooper <alcooperx@gmail.com>");
	MODULE_DESCRIPTION("Broadcom USB Pinmap Driver");
	MODULE_LICENSE("GPL");