NFC: Add ACPI support for NXP PN544 (0a5942c8) · Commits · 戴 / test

drivers/nfc/pn544/i2c.c

+109 −2

Original line number	Diff line number	Diff line
		@@ -24,11 +24,13 @@
		#include <linux/gpio.h>
		#include <linux/of_gpio.h>
		#include <linux/of_irq.h>
		#include <linux/acpi.h>
		#include <linux/miscdevice.h>
		#include <linux/interrupt.h>
		#include <linux/delay.h>
		#include <linux/nfc.h>
		#include <linux/firmware.h>
		#include <linux/gpio/consumer.h>
		#include <linux/platform_data/pn544.h>
		#include <asm/unaligned.h>

		@@ -41,6 +43,11 @@
		#define PN544_I2C_FRAME_HEADROOM 1
		#define PN544_I2C_FRAME_TAILROOM 2

		/* GPIO names */
		#define PN544_GPIO_NAME_IRQ "pn544_irq"
		#define PN544_GPIO_NAME_FW "pn544_fw"
		#define PN544_GPIO_NAME_EN "pn544_en"

		/* framing in HCI mode */
		#define PN544_HCI_I2C_LLC_LEN 1
		#define PN544_HCI_I2C_LLC_CRC 2
		@@ -58,6 +65,13 @@ static struct i2c_device_id pn544_hci_i2c_id_table[] = {

		MODULE_DEVICE_TABLE(i2c, pn544_hci_i2c_id_table);

		static const struct acpi_device_id pn544_hci_i2c_acpi_match[] = {
		{"NXP5440", 0},
		{}
		};

		MODULE_DEVICE_TABLE(acpi, pn544_hci_i2c_acpi_match);

		#define PN544_HCI_I2C_DRIVER_NAME "pn544_hci_i2c"

		/*
		@@ -861,6 +875,90 @@ exit_state_wait_secure_write_answer:
		}
		}

		static int pn544_hci_i2c_acpi_request_resources(struct i2c_client *client)
		{
		struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
		const struct acpi_device_id *id;
		struct gpio_desc gpiod_en, gpiod_irq, *gpiod_fw;
		struct device *dev;
		int ret;

		if (!client)
		return -EINVAL;

		dev = &client->dev;

		/* Match the struct device against a given list of ACPI IDs */
		id = acpi_match_device(dev->driver->acpi_match_table, dev);

		if (!id)
		return -ENODEV;

		/* Get EN GPIO from ACPI */
		gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1);
		if (IS_ERR(gpiod_en)) {
		nfc_err(dev,
		"Unable to get EN GPIO\n");
		return -ENODEV;
		}

		phy->gpio_en = desc_to_gpio(gpiod_en);

		/* Configuration EN GPIO */
		ret = gpiod_direction_output(gpiod_en, 0);
		if (ret) {
		nfc_err(dev, "Fail EN pin direction\n");
		return ret;
		}

		/* Get FW GPIO from ACPI */
		gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2);
		if (IS_ERR(gpiod_fw)) {
		nfc_err(dev,
		"Unable to get FW GPIO\n");
		return -ENODEV;
		}

		phy->gpio_fw = desc_to_gpio(gpiod_fw);

		/* Configuration FW GPIO */
		ret = gpiod_direction_output(gpiod_fw, 0);
		if (ret) {
		nfc_err(dev, "Fail FW pin direction\n");
		return ret;
		}

		/* Get IRQ GPIO */
		gpiod_irq = devm_gpiod_get_index(dev, PN544_GPIO_NAME_IRQ, 0);
		if (IS_ERR(gpiod_irq)) {
		nfc_err(dev,
		"Unable to get IRQ GPIO\n");
		return -ENODEV;
		}

		phy->gpio_irq = desc_to_gpio(gpiod_irq);

		/* Configure IRQ GPIO */
		ret = gpiod_direction_input(gpiod_irq);
		if (ret) {
		nfc_err(dev, "Fail IRQ pin direction\n");
		return ret;
		}

		/* Map the pin to an IRQ */
		ret = gpiod_to_irq(gpiod_irq);
		if (ret < 0) {
		nfc_err(dev, "Fail pin IRQ mapping\n");
		return ret;
		}

		nfc_info(dev, "GPIO resource, no:%d irq:%d\n",
		desc_to_gpio(gpiod_irq), ret);
		client->irq = ret;

		return 0;
		}

		#ifdef CONFIG_OF

		static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
		@@ -886,7 +984,7 @@ static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
		phy->gpio_en = ret;

		/* Configuration of EN GPIO */
		ret = gpio_request(phy->gpio_en, "pn544_en");
		ret = gpio_request(phy->gpio_en, PN544_GPIO_NAME_EN);
		if (ret) {
		nfc_err(&client->dev, "Fail EN pin\n");
		goto err_dt;
		@@ -908,7 +1006,7 @@ static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
		phy->gpio_fw = ret;

		/* Configuration of FW GPIO */
		ret = gpio_request(phy->gpio_fw, "pn544_fw");
		ret = gpio_request(phy->gpio_fw, PN544_GPIO_NAME_FW);
		if (ret) {
		nfc_err(&client->dev, "Fail FW pin\n");
		goto err_gpio_en;
		@@ -1003,6 +1101,14 @@ static int pn544_hci_i2c_probe(struct i2c_client *client,
		phy->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
		phy->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
		phy->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
		/* Using ACPI */
		} else if (ACPI_HANDLE(&client->dev)) {
		r = pn544_hci_i2c_acpi_request_resources(client);
		if (r) {
		nfc_err(&client->dev,
		"Cannot get ACPI data\n");
		return r;
		}
		} else {
		nfc_err(&client->dev, "No platform data\n");
		return -EINVAL;
		@@ -1082,6 +1188,7 @@ static struct i2c_driver pn544_hci_i2c_driver = {
		.name = PN544_HCI_I2C_DRIVER_NAME,
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(of_pn544_i2c_match),
		.acpi_match_table = ACPI_PTR(pn544_hci_i2c_acpi_match),
		},
		.probe = pn544_hci_i2c_probe,
		.id_table = pn544_hci_i2c_id_table,

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