NFC: Separate pn544 hci driver in HW dependant and independant parts
authorEric Lapuyade <eric.lapuyade@linux.intel.com>
Tue, 2 Oct 2012 16:44:06 +0000 (18:44 +0200)
committerSamuel Ortiz <sameo@linux.intel.com>
Fri, 26 Oct 2012 16:26:46 +0000 (18:26 +0200)
The driver now has all HCI stuff isolated in one file, and all the
hardware link specifics in another. Writing a pn544 driver on top of
another hardware link is now just a matter of adding a new file for that
new hardware specifics.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
drivers/nfc/Makefile
drivers/nfc/pn544/Makefile [new file with mode: 0644]
drivers/nfc/pn544/i2c.c [new file with mode: 0644]
drivers/nfc/pn544/pn544.c [moved from drivers/nfc/pn544_hci.c with 67% similarity]
drivers/nfc/pn544/pn544.h [new file with mode: 0644]
include/net/nfc/hci.h

index bf05831..36c3590 100644 (file)
@@ -2,7 +2,7 @@
 # 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
 
diff --git a/drivers/nfc/pn544/Makefile b/drivers/nfc/pn544/Makefile
new file mode 100644 (file)
index 0000000..7257338
--- /dev/null
@@ -0,0 +1,7 @@
+#
+# Makefile for PN544 HCI based NFC driver
+#
+
+obj-$(CONFIG_PN544_HCI_NFC)    += pn544_i2c.o
+
+pn544_i2c-y            := pn544.o i2c.o
diff --git a/drivers/nfc/pn544/i2c.c b/drivers/nfc/pn544/i2c.c
new file mode 100644 (file)
index 0000000..fb430d8
--- /dev/null
@@ -0,0 +1,500 @@
+/*
+ * 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);
similarity index 67%
rename from drivers/nfc/pn544_hci.c
rename to drivers/nfc/pn544/pn544.c
index 70858b5..cf34445 100644 (file)
  * 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,
@@ -141,259 +115,22 @@ static struct nfc_hci_gate pn544_gates[] = {
 
 /* 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);
@@ -406,7 +143,7 @@ static int pn544_hci_open(struct nfc_hci_dev *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;
@@ -425,7 +162,7 @@ static void pn544_hci_close(struct nfc_hci_dev *hdev)
        if (info->state == PN544_ST_COLD)
                goto out;
 
-       pn544_hci_disable(info);
+       info->phy_ops->disable(info->phy_id);
 
        info->state = PN544_ST_COLD;
 
@@ -600,40 +337,11 @@ static int pn544_hci_ready(struct nfc_hci_dev *hdev)
        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,
@@ -1076,68 +784,26 @@ static struct nfc_hci_ops pn544_hci_ops = {
        .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);
 
@@ -1157,13 +823,11 @@ static int __devinit pn544_hci_probe(struct i2c_client *client,
                    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;
        }
@@ -1174,79 +838,25 @@ static int __devinit pn544_hci_probe(struct i2c_client *client,
        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);
diff --git a/drivers/nfc/pn544/pn544.h b/drivers/nfc/pn544/pn544.h
new file mode 100644 (file)
index 0000000..f47c645
--- /dev/null
@@ -0,0 +1,32 @@
+/*
+ * 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_ */
index bc87b8f..639f50a 100644 (file)
 
 #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 {