# Makefile for nfc devices
#
-obj-$(CONFIG_PN544_HCI_NFC) += pn544_hci.o
+obj-$(CONFIG_PN544_HCI_NFC) += pn544/
obj-$(CONFIG_NFC_PN533) += pn533.o
obj-$(CONFIG_NFC_WILINK) += nfcwilink.o
--- /dev/null
+#
+# Makefile for PN544 HCI based NFC driver
+#
+
+obj-$(CONFIG_PN544_HCI_NFC) += pn544_i2c.o
+
+pn544_i2c-y := pn544.o i2c.o
--- /dev/null
+/*
+ * I2C Link Layer for PN544 HCI based Driver
+ *
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/crc-ccitt.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/miscdevice.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+
+#include <linux/nfc/pn544.h>
+
+#include <net/nfc/hci.h>
+#include <net/nfc/llc.h>
+
+#include "pn544.h"
+
+#define PN544_I2C_FRAME_HEADROOM 1
+#define PN544_I2C_FRAME_TAILROOM 2
+
+/* framing in HCI mode */
+#define PN544_HCI_I2C_LLC_LEN 1
+#define PN544_HCI_I2C_LLC_CRC 2
+#define PN544_HCI_I2C_LLC_LEN_CRC (PN544_HCI_I2C_LLC_LEN + \
+ PN544_HCI_I2C_LLC_CRC)
+#define PN544_HCI_I2C_LLC_MIN_SIZE (1 + PN544_HCI_I2C_LLC_LEN_CRC)
+#define PN544_HCI_I2C_LLC_MAX_PAYLOAD 29
+#define PN544_HCI_I2C_LLC_MAX_SIZE (PN544_HCI_I2C_LLC_LEN_CRC + 1 + \
+ PN544_HCI_I2C_LLC_MAX_PAYLOAD)
+
+static struct i2c_device_id pn544_hci_i2c_id_table[] = {
+ {"pn544", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, pn544_hci_i2c_id_table);
+
+#define PN544_HCI_I2C_DRIVER_NAME "pn544_hci_i2c"
+
+struct pn544_i2c_phy {
+ struct i2c_client *i2c_dev;
+ struct nfc_hci_dev *hdev;
+
+ unsigned int gpio_en;
+ unsigned int gpio_irq;
+ unsigned int gpio_fw;
+ unsigned int en_polarity;
+
+ int powered;
+
+ int hard_fault; /*
+ * < 0 if hardware error occured (e.g. i2c err)
+ * and prevents normal operation.
+ */
+};
+
+#define I2C_DUMP_SKB(info, skb) \
+do { \
+ pr_debug("%s:\n", info); \
+ print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
+ 16, 1, (skb)->data, (skb)->len, 0); \
+} while (0)
+
+static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy)
+{
+ int polarity, retry, ret;
+ char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
+ int count = sizeof(rset_cmd);
+
+ pr_info(DRIVER_DESC ": %s\n", __func__);
+ dev_info(&phy->i2c_dev->dev, "Detecting nfc_en polarity\n");
+
+ /* Disable fw download */
+ gpio_set_value(phy->gpio_fw, 0);
+
+ for (polarity = 0; polarity < 2; polarity++) {
+ phy->en_polarity = polarity;
+ retry = 3;
+ while (retry--) {
+ /* power off */
+ gpio_set_value(phy->gpio_en, !phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ /* power on */
+ gpio_set_value(phy->gpio_en, phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ /* send reset */
+ dev_dbg(&phy->i2c_dev->dev, "Sending reset cmd\n");
+ ret = i2c_master_send(phy->i2c_dev, rset_cmd, count);
+ if (ret == count) {
+ dev_info(&phy->i2c_dev->dev,
+ "nfc_en polarity : active %s\n",
+ (polarity == 0 ? "low" : "high"));
+ goto out;
+ }
+ }
+ }
+
+ dev_err(&phy->i2c_dev->dev,
+ "Could not detect nfc_en polarity, fallback to active high\n");
+
+out:
+ gpio_set_value(phy->gpio_en, !phy->en_polarity);
+}
+
+static int pn544_hci_i2c_enable(void *phy_id)
+{
+ struct pn544_i2c_phy *phy = phy_id;
+
+ pr_info(DRIVER_DESC ": %s\n", __func__);
+
+ gpio_set_value(phy->gpio_fw, 0);
+ gpio_set_value(phy->gpio_en, phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ phy->powered = 1;
+
+ return 0;
+}
+
+static void pn544_hci_i2c_disable(void *phy_id)
+{
+ struct pn544_i2c_phy *phy = phy_id;
+
+ pr_info(DRIVER_DESC ": %s\n", __func__);
+
+ gpio_set_value(phy->gpio_fw, 0);
+ gpio_set_value(phy->gpio_en, !phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ gpio_set_value(phy->gpio_en, phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ gpio_set_value(phy->gpio_en, !phy->en_polarity);
+ usleep_range(10000, 15000);
+
+ phy->powered = 0;
+}
+
+static void pn544_hci_i2c_add_len_crc(struct sk_buff *skb)
+{
+ u16 crc;
+ int len;
+
+ len = skb->len + 2;
+ *skb_push(skb, 1) = len;
+
+ crc = crc_ccitt(0xffff, skb->data, skb->len);
+ crc = ~crc;
+ *skb_put(skb, 1) = crc & 0xff;
+ *skb_put(skb, 1) = crc >> 8;
+}
+
+static void pn544_hci_i2c_remove_len_crc(struct sk_buff *skb)
+{
+ skb_pull(skb, PN544_I2C_FRAME_HEADROOM);
+ skb_trim(skb, PN544_I2C_FRAME_TAILROOM);
+}
+
+/*
+ * Writing a frame must not return the number of written bytes.
+ * It must return either zero for success, or <0 for error.
+ * In addition, it must not alter the skb
+ */
+static int pn544_hci_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+ int r;
+ struct pn544_i2c_phy *phy = phy_id;
+ struct i2c_client *client = phy->i2c_dev;
+
+ if (phy->hard_fault != 0)
+ return phy->hard_fault;
+
+ usleep_range(3000, 6000);
+
+ pn544_hci_i2c_add_len_crc(skb);
+
+ I2C_DUMP_SKB("i2c frame written", skb);
+
+ r = i2c_master_send(client, skb->data, skb->len);
+
+ if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+ usleep_range(6000, 10000);
+ r = i2c_master_send(client, skb->data, skb->len);
+ }
+
+ if (r >= 0) {
+ if (r != skb->len)
+ r = -EREMOTEIO;
+ else
+ r = 0;
+ }
+
+ pn544_hci_i2c_remove_len_crc(skb);
+
+ return r;
+}
+
+static int check_crc(u8 *buf, int buflen)
+{
+ int len;
+ u16 crc;
+
+ len = buf[0] + 1;
+ crc = crc_ccitt(0xffff, buf, len - 2);
+ crc = ~crc;
+
+ if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
+ pr_err(PN544_HCI_I2C_DRIVER_NAME
+ ": CRC error 0x%x != 0x%x 0x%x\n",
+ crc, buf[len - 1], buf[len - 2]);
+
+ pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
+ print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
+ 16, 2, buf, buflen, false);
+ return -EPERM;
+ }
+ return 0;
+}
+
+/*
+ * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
+ * that i2c bus will be flushed and that next read will start on a new frame.
+ * returned skb contains only LLC header and payload.
+ * returns:
+ * -EREMOTEIO : i2c read error (fatal)
+ * -EBADMSG : frame was incorrect and discarded
+ * -ENOMEM : cannot allocate skb, frame dropped
+ */
+static int pn544_hci_i2c_read(struct pn544_i2c_phy *phy, struct sk_buff **skb)
+{
+ int r;
+ u8 len;
+ u8 tmp[PN544_HCI_I2C_LLC_MAX_SIZE - 1];
+ struct i2c_client *client = phy->i2c_dev;
+
+ r = i2c_master_recv(client, &len, 1);
+ if (r != 1) {
+ dev_err(&client->dev, "cannot read len byte\n");
+ return -EREMOTEIO;
+ }
+
+ if ((len < (PN544_HCI_I2C_LLC_MIN_SIZE - 1)) ||
+ (len > (PN544_HCI_I2C_LLC_MAX_SIZE - 1))) {
+ dev_err(&client->dev, "invalid len byte\n");
+ r = -EBADMSG;
+ goto flush;
+ }
+
+ *skb = alloc_skb(1 + len, GFP_KERNEL);
+ if (*skb == NULL) {
+ r = -ENOMEM;
+ goto flush;
+ }
+
+ *skb_put(*skb, 1) = len;
+
+ r = i2c_master_recv(client, skb_put(*skb, len), len);
+ if (r != len) {
+ kfree_skb(*skb);
+ return -EREMOTEIO;
+ }
+
+ I2C_DUMP_SKB("i2c frame read", *skb);
+
+ r = check_crc((*skb)->data, (*skb)->len);
+ if (r != 0) {
+ kfree_skb(*skb);
+ r = -EBADMSG;
+ goto flush;
+ }
+
+ skb_pull(*skb, 1);
+ skb_trim(*skb, (*skb)->len - 2);
+
+ usleep_range(3000, 6000);
+
+ return 0;
+
+flush:
+ if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
+ r = -EREMOTEIO;
+
+ usleep_range(3000, 6000);
+
+ return r;
+}
+
+/*
+ * Reads an shdlc frame from the chip. This is not as straightforward as it
+ * seems. There are cases where we could loose the frame start synchronization.
+ * The frame format is len-data-crc, and corruption can occur anywhere while
+ * transiting on i2c bus, such that we could read an invalid len.
+ * In order to recover synchronization with the next frame, we must be sure
+ * to read the real amount of data without using the len byte. We do this by
+ * assuming the following:
+ * - the chip will always present only one single complete frame on the bus
+ * before triggering the interrupt
+ * - the chip will not present a new frame until we have completely read
+ * the previous one (or until we have handled the interrupt).
+ * The tricky case is when we read a corrupted len that is less than the real
+ * len. We must detect this here in order to determine that we need to flush
+ * the bus. This is the reason why we check the crc here.
+ */
+static irqreturn_t pn544_hci_i2c_irq_thread_fn(int irq, void *phy_id)
+{
+ struct pn544_i2c_phy *phy = phy_id;
+ struct i2c_client *client;
+ struct sk_buff *skb = NULL;
+ int r;
+
+ if (!phy || irq != phy->i2c_dev->irq) {
+ WARN_ON_ONCE(1);
+ return IRQ_NONE;
+ }
+
+ client = phy->i2c_dev;
+ dev_dbg(&client->dev, "IRQ\n");
+
+ if (phy->hard_fault != 0)
+ return IRQ_HANDLED;
+
+ r = pn544_hci_i2c_read(phy, &skb);
+ if (r == -EREMOTEIO) {
+ phy->hard_fault = r;
+
+ nfc_hci_recv_frame(phy->hdev, NULL);
+
+ return IRQ_HANDLED;
+ } else if ((r == -ENOMEM) || (r == -EBADMSG)) {
+ return IRQ_HANDLED;
+ }
+
+ nfc_hci_recv_frame(phy->hdev, skb);
+
+ return IRQ_HANDLED;
+}
+
+static struct nfc_phy_ops i2c_phy_ops = {
+ .write = pn544_hci_i2c_write,
+ .enable = pn544_hci_i2c_enable,
+ .disable = pn544_hci_i2c_disable,
+};
+
+static int __devinit pn544_hci_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pn544_i2c_phy *phy;
+ struct pn544_nfc_platform_data *pdata;
+ int r = 0;
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+ dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
+ return -ENODEV;
+ }
+
+ phy = kzalloc(sizeof(struct pn544_i2c_phy), GFP_KERNEL);
+ if (!phy) {
+ dev_err(&client->dev,
+ "Cannot allocate memory for pn544 i2c phy.\n");
+ r = -ENOMEM;
+ goto err_phy_alloc;
+ }
+
+ phy->i2c_dev = client;
+ i2c_set_clientdata(client, phy);
+
+ pdata = client->dev.platform_data;
+ if (pdata == NULL) {
+ dev_err(&client->dev, "No platform data\n");
+ r = -EINVAL;
+ goto err_pdata;
+ }
+
+ if (pdata->request_resources == NULL) {
+ dev_err(&client->dev, "request_resources() missing\n");
+ r = -EINVAL;
+ goto err_pdata;
+ }
+
+ r = pdata->request_resources(client);
+ if (r) {
+ dev_err(&client->dev, "Cannot get platform resources\n");
+ goto err_pdata;
+ }
+
+ 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);
+
+ pn544_hci_i2c_platform_init(phy);
+
+ r = request_threaded_irq(client->irq, NULL, pn544_hci_i2c_irq_thread_fn,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ PN544_HCI_I2C_DRIVER_NAME, phy);
+ if (r < 0) {
+ dev_err(&client->dev, "Unable to register IRQ handler\n");
+ goto err_rti;
+ }
+
+ r = pn544_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
+ PN544_I2C_FRAME_HEADROOM, PN544_I2C_FRAME_TAILROOM,
+ PN544_HCI_I2C_LLC_MAX_PAYLOAD, &phy->hdev);
+ if (r < 0)
+ goto err_hci;
+
+ return 0;
+
+err_hci:
+ free_irq(client->irq, phy);
+
+err_rti:
+ if (pdata->free_resources != NULL)
+ pdata->free_resources();
+
+err_pdata:
+ kfree(phy);
+
+err_phy_alloc:
+ return r;
+}
+
+static __devexit int pn544_hci_i2c_remove(struct i2c_client *client)
+{
+ struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
+ struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ pn544_hci_remove(phy->hdev);
+
+ if (phy->powered)
+ pn544_hci_i2c_disable(phy);
+
+ free_irq(client->irq, phy);
+ if (pdata->free_resources)
+ pdata->free_resources();
+
+ kfree(phy);
+
+ return 0;
+}
+
+static struct i2c_driver pn544_hci_i2c_driver = {
+ .driver = {
+ .name = PN544_HCI_I2C_DRIVER_NAME,
+ },
+ .probe = pn544_hci_i2c_probe,
+ .id_table = pn544_hci_i2c_id_table,
+ .remove = __devexit_p(pn544_hci_i2c_remove),
+};
+
+static int __init pn544_hci_i2c_init(void)
+{
+ int r;
+
+ pr_debug(DRIVER_DESC ": %s\n", __func__);
+
+ r = i2c_add_driver(&pn544_hci_i2c_driver);
+ if (r) {
+ pr_err(PN544_HCI_I2C_DRIVER_NAME
+ ": driver registration failed\n");
+ return r;
+ }
+
+ return 0;
+}
+
+static void __exit pn544_hci_i2c_exit(void)
+{
+ i2c_del_driver(&pn544_hci_i2c_driver);
+}
+
+module_init(pn544_hci_i2c_init);
+module_exit(pn544_hci_i2c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <linux/crc-ccitt.h>
-#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
-#include <linux/miscdevice.h>
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-#include <linux/i2c.h>
#include <linux/nfc.h>
#include <net/nfc/hci.h>
#include <net/nfc/llc.h>
-#include <linux/nfc/pn544.h>
-
-#define DRIVER_DESC "HCI NFC driver for PN544"
-
-#define PN544_HCI_DRIVER_NAME "pn544_hci"
+#include "pn544.h"
/* Timing restrictions (ms) */
#define PN544_HCI_RESETVEN_TIME 30
-static struct i2c_device_id pn544_hci_id_table[] = {
- {"pn544", 0},
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, pn544_hci_id_table);
-
#define HCI_MODE 0
#define FW_MODE 1
-/* framing in HCI mode */
-#define PN544_HCI_LLC_LEN 1
-#define PN544_HCI_LLC_CRC 2
-#define PN544_HCI_LLC_LEN_CRC (PN544_HCI_LLC_LEN + PN544_HCI_LLC_CRC)
-#define PN544_HCI_LLC_MIN_SIZE (1 + PN544_HCI_LLC_LEN_CRC)
-#define PN544_HCI_LLC_MAX_PAYLOAD 29
-#define PN544_HCI_LLC_MAX_SIZE (PN544_HCI_LLC_LEN_CRC + 1 + \
- PN544_HCI_LLC_MAX_PAYLOAD)
-
enum pn544_state {
PN544_ST_COLD,
PN544_ST_FW_READY,
/* Largest headroom needed for outgoing custom commands */
#define PN544_CMDS_HEADROOM 2
-#define PN544_FRAME_HEADROOM 1
-#define PN544_FRAME_TAILROOM 2
struct pn544_hci_info {
- struct i2c_client *i2c_dev;
+ struct nfc_phy_ops *phy_ops;
+ void *phy_id;
+
struct nfc_hci_dev *hdev;
enum pn544_state state;
struct mutex info_lock;
- unsigned int gpio_en;
- unsigned int gpio_irq;
- unsigned int gpio_fw;
- unsigned int en_polarity;
-
- int hard_fault; /*
- * < 0 if hardware error occured (e.g. i2c err)
- * and prevents normal operation.
- */
int async_cb_type;
data_exchange_cb_t async_cb;
void *async_cb_context;
};
-static void pn544_hci_platform_init(struct pn544_hci_info *info)
-{
- int polarity, retry, ret;
- char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
- int count = sizeof(rset_cmd);
-
- pr_info(DRIVER_DESC ": %s\n", __func__);
- dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
-
- /* Disable fw download */
- gpio_set_value(info->gpio_fw, 0);
-
- for (polarity = 0; polarity < 2; polarity++) {
- info->en_polarity = polarity;
- retry = 3;
- while (retry--) {
- /* power off */
- gpio_set_value(info->gpio_en, !info->en_polarity);
- usleep_range(10000, 15000);
-
- /* power on */
- gpio_set_value(info->gpio_en, info->en_polarity);
- usleep_range(10000, 15000);
-
- /* send reset */
- dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
- ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
- if (ret == count) {
- dev_info(&info->i2c_dev->dev,
- "nfc_en polarity : active %s\n",
- (polarity == 0 ? "low" : "high"));
- goto out;
- }
- }
- }
-
- dev_err(&info->i2c_dev->dev,
- "Could not detect nfc_en polarity, fallback to active high\n");
-
-out:
- gpio_set_value(info->gpio_en, !info->en_polarity);
-}
-
-static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
-{
- pr_info(DRIVER_DESC ": %s\n", __func__);
-
- gpio_set_value(info->gpio_fw, 0);
- gpio_set_value(info->gpio_en, info->en_polarity);
- usleep_range(10000, 15000);
-
- return 0;
-}
-
-static void pn544_hci_disable(struct pn544_hci_info *info)
-{
- pr_info(DRIVER_DESC ": %s\n", __func__);
-
- gpio_set_value(info->gpio_fw, 0);
- gpio_set_value(info->gpio_en, !info->en_polarity);
- usleep_range(10000, 15000);
-
- gpio_set_value(info->gpio_en, info->en_polarity);
- usleep_range(10000, 15000);
-
- gpio_set_value(info->gpio_en, !info->en_polarity);
- usleep_range(10000, 15000);
-}
-
-static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
-{
- int r;
-
- usleep_range(3000, 6000);
-
- r = i2c_master_send(client, buf, len);
-
- if (r == -EREMOTEIO) { /* Retry, chip was in standby */
- usleep_range(6000, 10000);
- r = i2c_master_send(client, buf, len);
- }
-
- if (r >= 0) {
- if (r != len)
- return -EREMOTEIO;
- else
- return 0;
- }
-
- return r;
-}
-
-static int check_crc(u8 *buf, int buflen)
-{
- int len;
- u16 crc;
-
- len = buf[0] + 1;
- crc = crc_ccitt(0xffff, buf, len - 2);
- crc = ~crc;
-
- if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
- pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
- crc, buf[len - 1], buf[len - 2]);
-
- pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
- print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
- 16, 2, buf, buflen, false);
- return -EPERM;
- }
- return 0;
-}
-
-/*
- * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
- * that i2c bus will be flushed and that next read will start on a new frame.
- * returned skb contains only LLC header and payload.
- * returns:
- * -EREMOTEIO : i2c read error (fatal)
- * -EBADMSG : frame was incorrect and discarded
- * -ENOMEM : cannot allocate skb, frame dropped
- */
-static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
-{
- int r;
- u8 len;
- u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
-
- r = i2c_master_recv(client, &len, 1);
- if (r != 1) {
- dev_err(&client->dev, "cannot read len byte\n");
- return -EREMOTEIO;
- }
-
- if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
- (len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
- dev_err(&client->dev, "invalid len byte\n");
- r = -EBADMSG;
- goto flush;
- }
-
- *skb = alloc_skb(1 + len, GFP_KERNEL);
- if (*skb == NULL) {
- r = -ENOMEM;
- goto flush;
- }
-
- *skb_put(*skb, 1) = len;
-
- r = i2c_master_recv(client, skb_put(*skb, len), len);
- if (r != len) {
- kfree_skb(*skb);
- return -EREMOTEIO;
- }
-
- r = check_crc((*skb)->data, (*skb)->len);
- if (r != 0) {
- kfree_skb(*skb);
- r = -EBADMSG;
- goto flush;
- }
-
- skb_pull(*skb, 1);
- skb_trim(*skb, (*skb)->len - 2);
-
- usleep_range(3000, 6000);
-
- return 0;
-
-flush:
- if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
- r = -EREMOTEIO;
-
- usleep_range(3000, 6000);
-
- return r;
-}
-
-/*
- * Reads an shdlc frame from the chip. This is not as straightforward as it
- * seems. There are cases where we could loose the frame start synchronization.
- * The frame format is len-data-crc, and corruption can occur anywhere while
- * transiting on i2c bus, such that we could read an invalid len.
- * In order to recover synchronization with the next frame, we must be sure
- * to read the real amount of data without using the len byte. We do this by
- * assuming the following:
- * - the chip will always present only one single complete frame on the bus
- * before triggering the interrupt
- * - the chip will not present a new frame until we have completely read
- * the previous one (or until we have handled the interrupt).
- * The tricky case is when we read a corrupted len that is less than the real
- * len. We must detect this here in order to determine that we need to flush
- * the bus. This is the reason why we check the crc here.
- */
-static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
-{
- struct pn544_hci_info *info = dev_id;
- struct i2c_client *client;
- struct sk_buff *skb = NULL;
- int r;
-
- if (!info || irq != info->i2c_dev->irq) {
- WARN_ON_ONCE(1);
- return IRQ_NONE;
- }
-
- client = info->i2c_dev;
- dev_dbg(&client->dev, "IRQ\n");
-
- if (info->hard_fault != 0)
- return IRQ_HANDLED;
-
- r = pn544_hci_i2c_read(client, &skb);
- if (r == -EREMOTEIO) {
- info->hard_fault = r;
-
- nfc_hci_recv_frame(info->hdev, NULL);
-
- return IRQ_HANDLED;
- } else if ((r == -ENOMEM) || (r == -EBADMSG)) {
- return IRQ_HANDLED;
- }
-
- nfc_hci_recv_frame(info->hdev, skb);
-
- return IRQ_HANDLED;
-}
-
static int pn544_hci_open(struct nfc_hci_dev *hdev)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
goto out;
}
- r = pn544_hci_enable(info, HCI_MODE);
+ r = info->phy_ops->enable(info->phy_id);
if (r == 0)
info->state = PN544_ST_READY;
if (info->state == PN544_ST_COLD)
goto out;
- pn544_hci_disable(info);
+ info->phy_ops->disable(info->phy_id);
info->state = PN544_ST_COLD;
return 0;
}
-static void pn544_hci_add_len_crc(struct sk_buff *skb)
-{
- u16 crc;
- int len;
-
- len = skb->len + 2;
- *skb_push(skb, 1) = len;
-
- crc = crc_ccitt(0xffff, skb->data, skb->len);
- crc = ~crc;
- *skb_put(skb, 1) = crc & 0xff;
- *skb_put(skb, 1) = crc >> 8;
-}
-
-static void pn544_hci_remove_len_crc(struct sk_buff *skb)
-{
- skb_pull(skb, PN544_FRAME_HEADROOM);
- skb_trim(skb, PN544_FRAME_TAILROOM);
-}
-
static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
- struct i2c_client *client = info->i2c_dev;
- int r;
-
- if (info->hard_fault != 0)
- return info->hard_fault;
-
- pn544_hci_add_len_crc(skb);
- r = pn544_hci_i2c_write(client, skb->data, skb->len);
- pn544_hci_remove_len_crc(skb);
- return r;
+ return info->phy_ops->write(info->phy_id, skb);
}
static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
.event_received = pn544_hci_event_received,
};
-static int __devinit pn544_hci_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+int pn544_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
+ int phy_headroom, int phy_tailroom, int phy_payload,
+ struct nfc_hci_dev **hdev)
{
struct pn544_hci_info *info;
- struct pn544_nfc_platform_data *pdata;
- int r = 0;
u32 protocols;
struct nfc_hci_init_data init_data;
-
- dev_dbg(&client->dev, "%s\n", __func__);
- dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
-
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
- dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
- return -ENODEV;
- }
+ int r;
info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
if (!info) {
- dev_err(&client->dev,
- "Cannot allocate memory for pn544_hci_info.\n");
+ pr_err("Cannot allocate memory for pn544_hci_info.\n");
r = -ENOMEM;
goto err_info_alloc;
}
- info->i2c_dev = client;
+ info->phy_ops = phy_ops;
+ info->phy_id = phy_id;
info->state = PN544_ST_COLD;
mutex_init(&info->info_lock);
- i2c_set_clientdata(client, info);
-
- pdata = client->dev.platform_data;
- if (pdata == NULL) {
- dev_err(&client->dev, "No platform data\n");
- r = -EINVAL;
- goto err_pdata;
- }
-
- if (pdata->request_resources == NULL) {
- dev_err(&client->dev, "request_resources() missing\n");
- r = -EINVAL;
- goto err_pdata;
- }
-
- r = pdata->request_resources(client);
- if (r) {
- dev_err(&client->dev, "Cannot get platform resources\n");
- goto err_pdata;
- }
-
- info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
- info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
- info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
-
- pn544_hci_platform_init(info);
-
- r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
- IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- PN544_HCI_DRIVER_NAME, info);
- if (r < 0) {
- dev_err(&client->dev, "Unable to register IRQ handler\n");
- goto err_rti;
- }
init_data.gate_count = ARRAY_SIZE(pn544_gates);
NFC_PROTO_NFC_DEP_MASK;
info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data,
- protocols, LLC_SHDLC_NAME,
- PN544_FRAME_HEADROOM +
- PN544_CMDS_HEADROOM,
- PN544_FRAME_TAILROOM,
- PN544_HCI_LLC_MAX_PAYLOAD);
+ protocols, llc_name,
+ phy_headroom + PN544_CMDS_HEADROOM,
+ phy_tailroom, phy_payload);
if (!info->hdev) {
- dev_err(&client->dev, "Cannot allocate nfc hdev.\n");
+ pr_err("Cannot allocate nfc hdev.\n");
r = -ENOMEM;
goto err_alloc_hdev;
}
if (r)
goto err_regdev;
+ *hdev = info->hdev;
+
return 0;
err_regdev:
nfc_hci_free_device(info->hdev);
err_alloc_hdev:
- free_irq(client->irq, info);
-
-err_rti:
- if (pdata->free_resources != NULL)
- pdata->free_resources();
-
-err_pdata:
kfree(info);
err_info_alloc:
return r;
}
-static __devexit int pn544_hci_remove(struct i2c_client *client)
+void pn544_hci_remove(struct nfc_hci_dev *hdev)
{
- struct pn544_hci_info *info = i2c_get_clientdata(client);
- struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
-
- dev_dbg(&client->dev, "%s\n", __func__);
-
- nfc_hci_free_device(info->hdev);
-
- if (info->state != PN544_ST_COLD) {
- if (pdata->disable)
- pdata->disable();
- }
-
- free_irq(client->irq, info);
- if (pdata->free_resources)
- pdata->free_resources();
+ struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
+ nfc_hci_unregister_device(hdev);
+ nfc_hci_free_device(hdev);
kfree(info);
-
- return 0;
-}
-
-static struct i2c_driver pn544_hci_driver = {
- .driver = {
- .name = PN544_HCI_DRIVER_NAME,
- },
- .probe = pn544_hci_probe,
- .id_table = pn544_hci_id_table,
- .remove = __devexit_p(pn544_hci_remove),
-};
-
-static int __init pn544_hci_init(void)
-{
- int r;
-
- pr_debug(DRIVER_DESC ": %s\n", __func__);
-
- r = i2c_add_driver(&pn544_hci_driver);
- if (r) {
- pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
- return r;
- }
-
- return 0;
}
-
-static void __exit pn544_hci_exit(void)
-{
- i2c_del_driver(&pn544_hci_driver);
-}
-
-module_init(pn544_hci_init);
-module_exit(pn544_hci_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION(DRIVER_DESC);
--- /dev/null
+/*
+ * Copyright (C) 2011 - 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __LOCAL_PN544_H_
+#define __LOCAL_PN544_H_
+
+#include <net/nfc/hci.h>
+
+#define DRIVER_DESC "HCI NFC driver for PN544"
+
+int pn544_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
+ int phy_headroom, int phy_tailroom, int phy_payload,
+ struct nfc_hci_dev **hdev);
+void pn544_hci_remove(struct nfc_hci_dev *hdev);
+
+#endif /* __LOCAL_PN544_H_ */
#include <net/nfc/nfc.h>
+struct nfc_phy_ops {
+ int (*write)(void *dev_id, struct sk_buff *skb);
+ int (*enable)(void *dev_id);
+ void (*disable)(void *dev_id);
+};
+
struct nfc_hci_dev;
struct nfc_hci_ops {
projects / karo-tx-linux.git / commitdiff