NFC: nxp-nci_i2c: Add support for enumerating through ACPI

[firefly-linux-kernel-4.4.55.git] / drivers / nfc / nxp-nci / i2c.c

diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c
index 17bd67dbebf05c27d2265752d200af9ff6deb932..2c58bd32c9912d36c4df44fd96d05e00253fcec7 100644 (file)
--- a/drivers/nfc/nxp-nci/i2c.c
+++ b/drivers/nfc/nxp-nci/i2c.c
@@ -2,8 +2,10 @@
  * I2C link layer for the NXP NCI driver
  *
  * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
+ * Copyright (C) 2012-2015  Intel Corporation. All rights reserved.
  *
  * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
+ * Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
  *
  * Derived from PN544 device driver:
  * Copyright (C) 2012  Intel Corporation. All rights reserved.
@@ -23,6 +25,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
@@ -48,6 +51,7 @@ struct nxp_nci_i2c_phy {
 
        unsigned int gpio_en;
        unsigned int gpio_fw;
+       unsigned int gpio_irq;
 
        int hard_fault; /*
                         * < 0 if hardware error occurred (e.g. i2c err)
@@ -308,6 +312,37 @@ static int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
 
 #endif
 
+static int nxp_nci_i2c_acpi_config(struct nxp_nci_i2c_phy *phy)
+{
+       struct i2c_client *client = phy->i2c_dev;
+       struct gpio_desc *gpiod_en, *gpiod_fw, *gpiod_irq;
+
+       gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2);
+       gpiod_fw = devm_gpiod_get_index(&client->dev, NULL, 1);
+       gpiod_irq = devm_gpiod_get_index(&client->dev, NULL, 0);
+
+       if (IS_ERR(gpiod_en) || IS_ERR(gpiod_fw) || IS_ERR(gpiod_irq)) {
+               nfc_err(&client->dev, "No GPIOs\n");
+               return -EINVAL;
+       }
+
+       gpiod_direction_output(gpiod_en, 0);
+       gpiod_direction_output(gpiod_fw, 0);
+       gpiod_direction_input(gpiod_irq);
+
+       client->irq = gpiod_to_irq(gpiod_irq);
+       if (client->irq < 0) {
+               nfc_err(&client->dev, "No IRQ\n");
+               return -EINVAL;
+       }
+
+       phy->gpio_en = desc_to_gpio(gpiod_en);
+       phy->gpio_fw = desc_to_gpio(gpiod_fw);
+       phy->gpio_irq = desc_to_gpio(gpiod_irq);
+
+       return 0;
+}
+
 static int nxp_nci_i2c_probe(struct i2c_client *client,
                            const struct i2c_device_id *id)
 {
@@ -343,6 +378,11 @@ static int nxp_nci_i2c_probe(struct i2c_client *client,
                phy->gpio_en = pdata->gpio_en;
                phy->gpio_fw = pdata->gpio_fw;
                client->irq = pdata->irq;
+       } else if (ACPI_HANDLE(&client->dev)) {
+               r = nxp_nci_i2c_acpi_config(phy);
+               if (r < 0)
+                       goto probe_exit;
+               goto nci_probe;
        } else {
                nfc_err(&client->dev, "No platform data\n");
                r = -EINVAL;
@@ -359,6 +399,7 @@ static int nxp_nci_i2c_probe(struct i2c_client *client,
        if (r < 0)
                goto probe_exit;
 
+nci_probe:
        r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
                          NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
        if (r < 0)
@@ -397,10 +438,19 @@ static const struct of_device_id of_nxp_nci_i2c_match[] = {
 };
 MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
 
+#ifdef CONFIG_ACPI
+static struct acpi_device_id acpi_id[] = {
+       { "NXP7471" },
+       { },
+};
+MODULE_DEVICE_TABLE(acpi, acpi_id);
+#endif
+
 static struct i2c_driver nxp_nci_i2c_driver = {
        .driver = {
                   .name = NXP_NCI_I2C_DRIVER_NAME,
                   .owner  = THIS_MODULE,
+                  .acpi_match_table = ACPI_PTR(acpi_id),
                   .of_match_table = of_match_ptr(of_nxp_nci_i2c_match),
                  },
        .probe = nxp_nci_i2c_probe,
@@ -413,3 +463,4 @@ module_i2c_driver(nxp_nci_i2c_driver);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
+MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");