NFC: Add ACPI support for NXP PN544

Currently there is no support for ACPI.
This patch uses the following configuration:
	- Device id: NXP5440
	- Pin mapping:
		- 0 IRQ pin
		- 1 enable pin
		- 2 firmware pin

Signed-off-by: Robert Dolca <robert.dolca@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 109 insertions, 2 deletions

diff --git a/drivers/nfc/pn544/i2c.c b/drivers/nfc/pn544/i2c.c
index d9018cda6c7f..cdde745b96bd 100644
--- a/drivers/nfc/pn544/i2c.c
+++ b/drivers/nfc/pn544/i2c.c
@@ -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,