--- /dev/null
+/**
+ * Marvell NFC-over-I2C driver: I2C interface related functions
+ *
+ * Copyright (C) 2015, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License"). You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
+ * this warranty disclaimer.
+ **/
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/pm_runtime.h>
+#include <linux/nfc.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+#include "nfcmrvl.h"
+
+struct nfcmrvl_i2c_drv_data {
+ unsigned long flags;
+ struct device *dev;
+ struct i2c_client *i2c;
+ struct nfcmrvl_private *priv;
+};
+
+static int nfcmrvl_i2c_read(struct nfcmrvl_i2c_drv_data *drv_data,
+ struct sk_buff **skb)
+{
+ int ret;
+ struct nci_ctrl_hdr nci_hdr;
+
+ /* Read NCI header to know the payload size */
+ ret = i2c_master_recv(drv_data->i2c, (u8 *)&nci_hdr, NCI_CTRL_HDR_SIZE);
+ if (ret != NCI_CTRL_HDR_SIZE) {
+ nfc_err(&drv_data->i2c->dev, "cannot read NCI header\n");
+ return -EBADMSG;
+ }
+
+ if (nci_hdr.plen > NCI_MAX_PAYLOAD_SIZE) {
+ nfc_err(&drv_data->i2c->dev, "invalid packet payload size\n");
+ return -EBADMSG;
+ }
+
+ *skb = nci_skb_alloc(drv_data->priv->ndev,
+ nci_hdr.plen + NCI_CTRL_HDR_SIZE, GFP_KERNEL);
+ if (!*skb)
+ return -ENOMEM;
+
+ /* Copy NCI header into the SKB */
+ memcpy(skb_put(*skb, NCI_CTRL_HDR_SIZE), &nci_hdr, NCI_CTRL_HDR_SIZE);
+
+ if (nci_hdr.plen) {
+ /* Read the NCI payload */
+ ret = i2c_master_recv(drv_data->i2c,
+ skb_put(*skb, nci_hdr.plen),
+ nci_hdr.plen);
+
+ if (ret != nci_hdr.plen) {
+ nfc_err(&drv_data->i2c->dev,
+ "Invalid frame payload length: %u (expected %u)\n",
+ ret, nci_hdr.plen);
+ kfree_skb(*skb);
+ return -EBADMSG;
+ }
+ }
+
+ return 0;
+}
+
+static irqreturn_t nfcmrvl_i2c_int_irq_thread_fn(int irq, void *drv_data_ptr)
+{
+ struct nfcmrvl_i2c_drv_data *drv_data = drv_data_ptr;
+ struct sk_buff *skb = NULL;
+ int ret;
+
+ if (!drv_data->priv)
+ return IRQ_HANDLED;
+
+ if (test_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags))
+ return IRQ_HANDLED;
+
+ ret = nfcmrvl_i2c_read(drv_data, &skb);
+
+ switch (ret) {
+ case -EREMOTEIO:
+ set_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags);
+ break;
+ case -ENOMEM:
+ case -EBADMSG:
+ nfc_err(&drv_data->i2c->dev, "read failed %d\n", ret);
+ break;
+ default:
+ if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
+ nfc_err(&drv_data->i2c->dev, "corrupted RX packet\n");
+ break;
+ }
+ return IRQ_HANDLED;
+}
+
+static int nfcmrvl_i2c_nci_open(struct nfcmrvl_private *priv)
+{
+ struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data;
+
+ if (!drv_data)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int nfcmrvl_i2c_nci_close(struct nfcmrvl_private *priv)
+{
+ return 0;
+}
+
+static int nfcmrvl_i2c_nci_send(struct nfcmrvl_private *priv,
+ struct sk_buff *skb)
+{
+ struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data;
+ int ret;
+
+ if (test_bit(NFCMRVL_PHY_ERROR, &priv->flags))
+ return -EREMOTEIO;
+
+ ret = i2c_master_send(drv_data->i2c, skb->data, skb->len);
+
+ /* Retry if chip was in standby */
+ if (ret == -EREMOTEIO) {
+ nfc_info(drv_data->dev, "chip may sleep, retry\n");
+ usleep_range(6000, 10000);
+ ret = i2c_master_send(drv_data->i2c, skb->data, skb->len);
+ }
+
+ if (ret >= 0) {
+ if (ret != skb->len) {
+ nfc_err(drv_data->dev,
+ "Invalid length sent: %u (expected %u)\n",
+ ret, skb->len);
+ ret = -EREMOTEIO;
+ } else
+ ret = 0;
+ kfree_skb(skb);
+ }
+
+ return ret;
+}
+
+static void nfcmrvl_i2c_nci_update_config(struct nfcmrvl_private *priv,
+ const void *param)
+{
+}
+
+static struct nfcmrvl_if_ops i2c_ops = {
+ .nci_open = nfcmrvl_i2c_nci_open,
+ .nci_close = nfcmrvl_i2c_nci_close,
+ .nci_send = nfcmrvl_i2c_nci_send,
+ .nci_update_config = nfcmrvl_i2c_nci_update_config,
+};
+
+static int nfcmrvl_i2c_parse_dt(struct device_node *node,
+ struct nfcmrvl_platform_data *pdata)
+{
+ int ret;
+
+ ret = nfcmrvl_parse_dt(node, pdata);
+ if (ret < 0) {
+ pr_err("Failed to get generic entries\n");
+ return ret;
+ }
+
+ if (of_find_property(node, "i2c-int-falling", NULL))
+ pdata->irq_polarity = IRQF_TRIGGER_FALLING;
+ else
+ pdata->irq_polarity = IRQF_TRIGGER_RISING;
+
+ ret = irq_of_parse_and_map(node, 0);
+ if (ret < 0) {
+ pr_err("Unable to get irq, error: %d\n", ret);
+ return ret;
+ }
+ pdata->irq = ret;
+
+ return 0;
+}
+
+static int nfcmrvl_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct nfcmrvl_i2c_drv_data *drv_data;
+ struct nfcmrvl_platform_data *pdata;
+ struct nfcmrvl_platform_data config;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
+ return -ENODEV;
+ }
+
+ drv_data = devm_kzalloc(&client->dev, sizeof(*drv_data), GFP_KERNEL);
+ if (!drv_data)
+ return -ENOMEM;
+
+ drv_data->i2c = client;
+ drv_data->dev = &client->dev;
+ drv_data->priv = NULL;
+
+ i2c_set_clientdata(client, drv_data);
+
+ pdata = client->dev.platform_data;
+
+ if (!pdata && client->dev.of_node)
+ if (nfcmrvl_i2c_parse_dt(client->dev.of_node, &config) == 0)
+ pdata = &config;
+
+ if (!pdata)
+ return -EINVAL;
+
+ /* Request the read IRQ */
+ ret = devm_request_threaded_irq(&drv_data->i2c->dev, pdata->irq,
+ NULL, nfcmrvl_i2c_int_irq_thread_fn,
+ pdata->irq_polarity | IRQF_ONESHOT,
+ "nfcmrvl_i2c_int", drv_data);
+ if (ret < 0) {
+ nfc_err(&drv_data->i2c->dev,
+ "Unable to register IRQ handler\n");
+ return ret;
+ }
+
+ drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_I2C,
+ drv_data, &i2c_ops,
+ &drv_data->i2c->dev, pdata);
+
+ if (IS_ERR(drv_data->priv))
+ return PTR_ERR(drv_data->priv);
+
+ drv_data->priv->support_fw_dnld = true;
+
+ return 0;
+}
+
+static int nfcmrvl_i2c_remove(struct i2c_client *client)
+{
+ struct nfcmrvl_i2c_drv_data *drv_data = i2c_get_clientdata(client);
+
+ nfcmrvl_nci_unregister_dev(drv_data->priv);
+
+ return 0;
+}
+
+
+static const struct of_device_id of_nfcmrvl_i2c_match[] = {
+ { .compatible = "mrvl,nfc-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_nfcmrvl_i2c_match);
+
+static struct i2c_device_id nfcmrvl_i2c_id_table[] = {
+ { "nfcmrvl_i2c", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, nfcmrvl_i2c_id_table);
+
+static struct i2c_driver nfcmrvl_i2c_driver = {
+ .probe = nfcmrvl_i2c_probe,
+ .id_table = nfcmrvl_i2c_id_table,
+ .remove = nfcmrvl_i2c_remove,
+ .driver = {
+ .name = "nfcmrvl_i2c",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(of_nfcmrvl_i2c_match),
+ },
+};
+
+module_i2c_driver(nfcmrvl_i2c_driver);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION("Marvell NFC-over-I2C driver");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff