diff options
Diffstat (limited to 'drivers/nfc/st21nfca')
| -rw-r--r-- | drivers/nfc/st21nfca/Kconfig | 23 | ||||
| -rw-r--r-- | drivers/nfc/st21nfca/Makefile | 8 | ||||
| -rw-r--r-- | drivers/nfc/st21nfca/i2c.c | 724 | ||||
| -rw-r--r-- | drivers/nfc/st21nfca/st21nfca.c | 698 | ||||
| -rw-r--r-- | drivers/nfc/st21nfca/st21nfca.h | 87 |
5 files changed, 1540 insertions, 0 deletions
diff --git a/drivers/nfc/st21nfca/Kconfig b/drivers/nfc/st21nfca/Kconfig new file mode 100644 index 000000000000..ee459f066ade --- /dev/null +++ b/drivers/nfc/st21nfca/Kconfig @@ -0,0 +1,23 @@ +config NFC_ST21NFCA + tristate "STMicroelectronics ST21NFCA NFC driver" + depends on NFC_HCI + select CRC_CCITT + default n + ---help--- + STMicroelectronics ST21NFCA core driver. It implements the chipset + HCI logic and hooks into the NFC kernel APIs. Physical layers will + register against it. + + To compile this driver as a module, choose m here. The module will + be called st21nfca. + Say N if unsure. + +config NFC_ST21NFCA_I2C + tristate "NFC ST21NFCA i2c support" + depends on NFC_ST21NFCA && I2C && NFC_SHDLC + ---help--- + This module adds support for the STMicroelectronics st21nfca i2c interface. + Select this if your platform is using the i2c bus. + + If you choose to build a module, it'll be called st21nfca_i2c. + Say N if unsure. diff --git a/drivers/nfc/st21nfca/Makefile b/drivers/nfc/st21nfca/Makefile new file mode 100644 index 000000000000..038ed093a119 --- /dev/null +++ b/drivers/nfc/st21nfca/Makefile @@ -0,0 +1,8 @@ +# +# Makefile for ST21NFCA HCI based NFC driver +# + +st21nfca_i2c-objs = i2c.o + +obj-$(CONFIG_NFC_ST21NFCA) += st21nfca.o +obj-$(CONFIG_NFC_ST21NFCA_I2C) += st21nfca_i2c.o diff --git a/drivers/nfc/st21nfca/i2c.c b/drivers/nfc/st21nfca/i2c.c new file mode 100644 index 000000000000..3f954ed86d98 --- /dev/null +++ b/drivers/nfc/st21nfca/i2c.c @@ -0,0 +1,724 @@ +/* + * I2C Link Layer for ST21NFCA HCI based Driver + * Copyright (C) 2014 STMicroelectronics SAS. 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, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/crc-ccitt.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/miscdevice.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/nfc.h> +#include <linux/firmware.h> +#include <linux/unaligned/access_ok.h> +#include <linux/platform_data/st21nfca.h> + +#include <net/nfc/hci.h> +#include <net/nfc/llc.h> +#include <net/nfc/nfc.h> + +#include "st21nfca.h" + +/* + * Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF. + * Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism + * called byte stuffing has been introduced. + * + * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING + * - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) + * - xor byte with ST21NFCA_BYTE_STUFFING_MASK + */ +#define ST21NFCA_SOF_EOF 0x7e +#define ST21NFCA_BYTE_STUFFING_MASK 0x20 +#define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d + +/* SOF + 00 */ +#define ST21NFCA_FRAME_HEADROOM 2 + +/* 2 bytes crc + EOF */ +#define ST21NFCA_FRAME_TAILROOM 3 +#define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \ + buf[1] == 0) + +#define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c" + +static struct i2c_device_id st21nfca_hci_i2c_id_table[] = { + {ST21NFCA_HCI_DRIVER_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table); + +struct st21nfca_i2c_phy { + struct i2c_client *i2c_dev; + struct nfc_hci_dev *hdev; + + unsigned int gpio_ena; + unsigned int gpio_irq; + unsigned int irq_polarity; + + struct sk_buff *pending_skb; + int current_read_len; + /* + * crc might have fail because i2c macro + * is disable due to other interface activity + */ + int crc_trials; + + int powered; + int run_mode; + + /* + * < 0 if hardware error occured (e.g. i2c err) + * and prevents normal operation. + */ + int hard_fault; + struct mutex phy_lock; +}; +static u8 len_seq[] = { 13, 24, 15, 29 }; +static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40}; + +#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) + +/* + * In order to get the CLF in a known state we generate an internal reboot + * using a proprietary command. + * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF + * fill buffer. + */ +static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy) +{ + u16 wait_reboot[] = { 50, 300, 1000 }; + char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E }; + u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE]; + int i, r = -1; + + for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { + r = i2c_master_send(phy->i2c_dev, reboot_cmd, + sizeof(reboot_cmd)); + if (r < 0) + msleep(wait_reboot[i]); + } + if (r < 0) + return r; + + /* CLF is spending about 20ms to do an internal reboot */ + msleep(20); + r = -1; + for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) { + r = i2c_master_recv(phy->i2c_dev, tmp, + ST21NFCA_HCI_LLC_MAX_SIZE); + if (r < 0) + msleep(wait_reboot[i]); + } + if (r < 0) + return r; + + for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE && + tmp[i] == ST21NFCA_SOF_EOF; i++) + ; + + if (r != ST21NFCA_HCI_LLC_MAX_SIZE) + return -ENODEV; + + usleep_range(1000, 1500); + return 0; +} + +static int st21nfca_hci_i2c_enable(void *phy_id) +{ + struct st21nfca_i2c_phy *phy = phy_id; + + gpio_set_value(phy->gpio_ena, 1); + phy->powered = 1; + phy->run_mode = ST21NFCA_HCI_MODE; + + usleep_range(10000, 15000); + + return 0; +} + +static void st21nfca_hci_i2c_disable(void *phy_id) +{ + struct st21nfca_i2c_phy *phy = phy_id; + + pr_info("\n"); + gpio_set_value(phy->gpio_ena, 0); + + phy->powered = 0; +} + +static void st21nfca_hci_add_len_crc(struct sk_buff *skb) +{ + u16 crc; + u8 tmp; + + *skb_push(skb, 1) = 0; + + crc = crc_ccitt(0xffff, skb->data, skb->len); + crc = ~crc; + + tmp = crc & 0x00ff; + *skb_put(skb, 1) = tmp; + + tmp = (crc >> 8) & 0x00ff; + *skb_put(skb, 1) = tmp; +} + +static void st21nfca_hci_remove_len_crc(struct sk_buff *skb) +{ + skb_pull(skb, ST21NFCA_FRAME_HEADROOM); + skb_trim(skb, skb->len - ST21NFCA_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 st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb) +{ + int r = -1, i, j; + struct st21nfca_i2c_phy *phy = phy_id; + struct i2c_client *client = phy->i2c_dev; + u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2]; + + I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb); + + + if (phy->hard_fault != 0) + return phy->hard_fault; + + /* + * Compute CRC before byte stuffing computation on frame + * Note st21nfca_hci_add_len_crc is doing a byte stuffing + * on its own value + */ + st21nfca_hci_add_len_crc(skb); + + /* add ST21NFCA_SOF_EOF on tail */ + *skb_put(skb, 1) = ST21NFCA_SOF_EOF; + /* add ST21NFCA_SOF_EOF on head */ + *skb_push(skb, 1) = ST21NFCA_SOF_EOF; + + /* + * Compute byte stuffing + * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING + * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte) + * xor byte with ST21NFCA_BYTE_STUFFING_MASK + */ + tmp[0] = skb->data[0]; + for (i = 1, j = 1; i < skb->len - 1; i++, j++) { + if (skb->data[i] == ST21NFCA_SOF_EOF + || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) { + tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING; + j++; + tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK; + } else { + tmp[j] = skb->data[i]; + } + } + tmp[j] = skb->data[i]; + j++; + + /* + * Manage sleep mode + * Try 3 times to send data with delay between each + */ + mutex_lock(&phy->phy_lock); + for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) { + r = i2c_master_send(client, tmp, j); + if (r < 0) + msleep(wait_tab[i]); + } + mutex_unlock(&phy->phy_lock); + + if (r >= 0) { + if (r != j) + r = -EREMOTEIO; + else + r = 0; + } + + st21nfca_hci_remove_len_crc(skb); + + return r; +} + +static int get_frame_size(u8 *buf, int buflen) +{ + int len = 0; + if (buf[len + 1] == ST21NFCA_SOF_EOF) + return 0; + + for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++) + ; + + return len; +} + +static int check_crc(u8 *buf, int buflen) +{ + u16 crc; + + crc = crc_ccitt(0xffff, buf, buflen - 2); + crc = ~crc; + + if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) { + pr_err(ST21NFCA_HCI_DRIVER_NAME + ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1], + buf[buflen - 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; +} + +/* + * Prepare received data for upper layer. + * Received data include byte stuffing, crc and sof/eof + * which is not usable by hci part. + * returns: + * frame size without sof/eof, header and byte stuffing + * -EBADMSG : frame was incorrect and discarded + */ +static int st21nfca_hci_i2c_repack(struct sk_buff *skb) +{ + int i, j, r, size; + if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0)) + return -EBADMSG; + + size = get_frame_size(skb->data, skb->len); + if (size > 0) { + skb_trim(skb, size); + /* remove ST21NFCA byte stuffing for upper layer */ + for (i = 1, j = 0; i < skb->len; i++) { + if (skb->data[i + j] == + (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) { + skb->data[i] = skb->data[i + j + 1] + | ST21NFCA_BYTE_STUFFING_MASK; + i++; + j++; + } + skb->data[i] = skb->data[i + j]; + } + /* remove byte stuffing useless byte */ + skb_trim(skb, i - j); + /* remove ST21NFCA_SOF_EOF from head */ + skb_pull(skb, 1); + + r = check_crc(skb->data, skb->len); + if (r != 0) { + i = 0; + return -EBADMSG; + } + + /* remove headbyte */ + skb_pull(skb, 1); + /* remove crc. Byte Stuffing is already removed here */ + skb_trim(skb, skb->len - 2); + return skb->len; + } + 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: + * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at + * end of read) + * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF + * at end of read) + * -EREMOTEIO : i2c read error (fatal) + * -EBADMSG : frame was incorrect and discarded + * (value returned from st21nfca_hci_i2c_repack) + * -EIO : if no ST21NFCA_SOF_EOF is found after reaching + * the read length end sequence + */ +static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy, + struct sk_buff *skb) +{ + int r, i; + u8 len; + u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD]; + struct i2c_client *client = phy->i2c_dev; + + if (phy->current_read_len < ARRAY_SIZE(len_seq)) { + len = len_seq[phy->current_read_len]; + + /* + * Add retry mecanism + * Operation on I2C interface may fail in case of operation on + * RF or SWP interface + */ + r = 0; + mutex_lock(&phy->phy_lock); + for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) { + r = i2c_master_recv(client, buf, len); + if (r < 0) + msleep(wait_tab[i]); + } + mutex_unlock(&phy->phy_lock); + + if (r != len) { + phy->current_read_len = 0; + return -EREMOTEIO; + } + + /* + * The first read sequence does not start with SOF. + * Data is corrupeted so we drop it. + */ + if (!phy->current_read_len && buf[0] != ST21NFCA_SOF_EOF) { + skb_trim(skb, 0); + phy->current_read_len = 0; + return -EIO; + } else if (phy->current_read_len && + IS_START_OF_FRAME(buf)) { + /* + * Previous frame transmission was interrupted and + * the frame got repeated. + * Received frame start with ST21NFCA_SOF_EOF + 00. + */ + skb_trim(skb, 0); + phy->current_read_len = 0; + } + + memcpy(skb_put(skb, len), buf, len); + + if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) { + phy->current_read_len = 0; + return st21nfca_hci_i2c_repack(skb); + } + phy->current_read_len++; + return -EAGAIN; + } + return -EIO; +} + +/* + * Reads an shdlc frame from the chip. This is not as straightforward as it + * seems. The frame format is data-crc, and corruption can occur anywhere + * while transiting on i2c bus, such that we could read an invalid data. + * The tricky case is when we read a corrupted data or crc. We must detect + * this here in order to determine that data can be transmitted to the hci + * core. This is the reason why we check the crc here. + * The CLF will repeat a frame until we send a RR on that frame. + * + * On ST21NFCA, IRQ goes in idle when read starts. As no size information are + * available in the incoming data, other IRQ might come. Every IRQ will trigger + * a read sequence with different length and will fill the current frame. + * The reception is complete once we reach a ST21NFCA_SOF_EOF. + */ +static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id) +{ + struct st21nfca_i2c_phy *phy = phy_id; + struct i2c_client *client; + + 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 = st21nfca_hci_i2c_read(phy, phy->pending_skb); + if (r == -EREMOTEIO) { + phy->hard_fault = r; + + nfc_hci_recv_frame(phy->hdev, NULL); + + return IRQ_HANDLED; + } else if (r == -EAGAIN || r == -EIO) { + return IRQ_HANDLED; + } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) { + /* + * With ST21NFCA, only one interface (I2C, RF or SWP) + * may be active at a time. + * Having incorrect crc is usually due to i2c macrocell + * deactivation in the middle of a transmission. + * It may generate corrupted data on i2c. + * We give sometime to get i2c back. + * The complete frame will be repeated. + */ + msleep(wait_tab[phy->crc_trials]); + phy->crc_trials++; + phy->current_read_len = 0; + kfree_skb(phy->pending_skb); + } else if (r > 0) { + /* + * We succeeded to read data from the CLF and + * data is valid. + * Reset counter. + */ + nfc_hci_recv_frame(phy->hdev, phy->pending_skb); + phy->crc_trials = 0; + } + + phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); + if (phy->pending_skb == NULL) { + phy->hard_fault = -ENOMEM; + nfc_hci_recv_frame(phy->hdev, NULL); + } + + return IRQ_HANDLED; +} + +static struct nfc_phy_ops i2c_phy_ops = { + .write = st21nfca_hci_i2c_write, + .enable = st21nfca_hci_i2c_enable, + .disable = st21nfca_hci_i2c_disable, +}; + +#ifdef CONFIG_OF +static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client) +{ + struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); + struct device_node *pp; + int gpio; + int r; + + pp = client->dev.of_node; + if (!pp) + return -ENODEV; + + /* Get GPIO from device tree */ + gpio = of_get_named_gpio(pp, "enable-gpios", 0); + if (gpio < 0) { + nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n"); + return gpio; + } + + /* GPIO request and configuration */ + r = devm_gpio_request(&client->dev, gpio, "clf_enable"); + if (r) { + nfc_err(&client->dev, "Failed to request enable pin\n"); + return -ENODEV; + } + + r = gpio_direction_output(gpio, 1); + if (r) { + nfc_err(&client->dev, "Failed to set enable pin direction as output\n"); + return -ENODEV; + } + phy->gpio_ena = gpio; + + /* IRQ */ + r = irq_of_parse_and_map(pp, 0); + if (r < 0) { + nfc_err(&client->dev, + "Unable to get irq, error: %d\n", r); + return r; + } + + phy->irq_polarity = irq_get_trigger_type(r); + client->irq = r; + + return 0; +} +#else +static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client) +{ + return -ENODEV; +} +#endif + +static int st21nfca_hci_i2c_request_resources(struct i2c_client *client) +{ + struct st21nfca_nfc_platform_data *pdata; + struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); + int r; + int irq; + + pdata = client->dev.platform_data; + if (pdata == NULL) { + nfc_err(&client->dev, "No platform data\n"); + return -EINVAL; + } + + /* store for later use */ + phy->gpio_irq = pdata->gpio_irq; + phy->gpio_ena = pdata->gpio_ena; + phy->irq_polarity = pdata->irq_polarity; + + r = devm_gpio_request(&client->dev, phy->gpio_irq, "wake_up"); + if (r) { + pr_err("%s : gpio_request failed\n", __FILE__); + return -ENODEV; + } + + r = gpio_direction_input(phy->gpio_irq); + if (r) { + pr_err("%s : gpio_direction_input failed\n", __FILE__); + return -ENODEV; + } + + if (phy->gpio_ena > 0) { + r = devm_gpio_request(&client->dev, + phy->gpio_ena, "clf_enable"); + if (r) { + pr_err("%s : ena gpio_request failed\n", __FILE__); + return -ENODEV; + } + r = gpio_direction_output(phy->gpio_ena, 1); + + if (r) { + pr_err("%s : ena gpio_direction_output failed\n", + __FILE__); + return -ENODEV; + } + } + + /* IRQ */ + irq = gpio_to_irq(phy->gpio_irq); + if (irq < 0) { + nfc_err(&client->dev, + "Unable to get irq number for GPIO %d error %d\n", + phy->gpio_irq, r); + return -ENODEV; + } + client->irq = irq; + + return 0; +} + +static int st21nfca_hci_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct st21nfca_i2c_phy *phy; + struct st21nfca_nfc_platform_data *pdata; + int r; + + 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)) { + nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); + return -ENODEV; + } + + phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy), + GFP_KERNEL); + if (!phy) { + nfc_err(&client->dev, + "Cannot allocate memory for st21nfca i2c phy.\n"); + return -ENOMEM; + } + + phy->i2c_dev = client; + phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL); + if (phy->pending_skb == NULL) + return -ENOMEM; + + phy->current_read_len = 0; + phy->crc_trials = 0; + mutex_init(&phy->phy_lock); + i2c_set_clientdata(client, phy); + + pdata = client->dev.platform_data; + if (!pdata && client->dev.of_node) { + r = st21nfca_hci_i2c_of_request_resources(client); + if (r) { + nfc_err(&client->dev, "No platform data\n"); + return r; + } + } else if (pdata) { + r = st21nfca_hci_i2c_request_resources(client); + if (r) { + nfc_err(&client->dev, "Cannot get platform resources\n"); + return r; + } + } else { + nfc_err(&client->dev, "st21nfca platform resources not available\n"); + return -ENODEV; + } + + r = st21nfca_hci_platform_init(phy); + if (r < 0) { + nfc_err(&client->dev, "Unable to reboot st21nfca\n"); + return -ENODEV; + } + + r = devm_request_threaded_irq(&client->dev, client->irq, NULL, + st21nfca_hci_irq_thread_fn, + phy->irq_polarity | IRQF_ONESHOT, + ST21NFCA_HCI_DRIVER_NAME, phy); + if (r < 0) { + nfc_err(&client->dev, "Unable to register IRQ handler\n"); + return r; + } + + return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME, + ST21NFCA_FRAME_HEADROOM, ST21NFCA_FRAME_TAILROOM, + ST21NFCA_HCI_LLC_MAX_PAYLOAD, &phy->hdev); +} + +static int st21nfca_hci_i2c_remove(struct i2c_client *client) +{ + struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "%s\n", __func__); + + st21nfca_hci_remove(phy->hdev); + + if (phy->powered) + st21nfca_hci_i2c_disable(phy); + + return 0; +} + +static const struct of_device_id of_st21nfca_i2c_match[] = { + { .compatible = "st,st21nfca_i2c", }, + {} +}; + +static struct i2c_driver st21nfca_hci_i2c_driver = { + .driver = { + .owner = THIS_MODULE, + .name = ST21NFCA_HCI_I2C_DRIVER_NAME, + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(of_st21nfca_i2c_match), + }, + .probe = st21nfca_hci_i2c_probe, + .id_table = st21nfca_hci_i2c_id_table, + .remove = st21nfca_hci_i2c_remove, +}; + +module_i2c_driver(st21nfca_hci_i2c_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRIVER_DESC); diff --git a/drivers/nfc/st21nfca/st21nfca.c b/drivers/nfc/st21nfca/st21nfca.c new file mode 100644 index 000000000000..51e0f00b3a4f --- /dev/null +++ b/drivers/nfc/st21nfca/st21nfca.c @@ -0,0 +1,698 @@ +/* + * HCI based Driver for STMicroelectronics NFC Chip + * + * Copyright (C) 2014 STMicroelectronics SAS. 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/nfc.h> +#include <net/nfc/hci.h> +#include <net/nfc/llc.h> + +#include "st21nfca.h" + +#define DRIVER_DESC "HCI NFC driver for ST21NFCA" + +#define FULL_VERSION_LEN 3 + +/* Proprietary gates, events, commands and registers */ + +/* Commands that apply to all RF readers */ +#define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK 0x30 + +#define ST21NFCA_RF_READER_ISO15693_GATE 0x12 +#define ST21NFCA_RF_READER_ISO15693_INVENTORY 0x01 + +/* + * Reader gate for communication with contact-less cards using Type A + * protocol ISO14443-3 but not compliant with ISO14443-4 + */ +#define ST21NFCA_RF_READER_14443_3_A_GATE 0x15 +#define ST21NFCA_RF_READER_14443_3_A_UID 0x02 +#define ST21NFCA_RF_READER_14443_3_A_ATQA 0x03 +#define ST21NFCA_RF_READER_14443_3_A_SAK 0x04 + +#define ST21NFCA_DEVICE_MGNT_GATE 0x01 +#define ST21NFCA_DEVICE_MGNT_PIPE 0x02 + +#define ST21NFCA_DM_GETINFO 0x13 +#define ST21NFCA_DM_GETINFO_PIPE_LIST 0x02 +#define ST21NFCA_DM_GETINFO_PIPE_INFO 0x01 +#define ST21NFCA_DM_PIPE_CREATED 0x02 +#define ST21NFCA_DM_PIPE_OPEN 0x04 +#define ST21NFCA_DM_RF_ACTIVE 0x80 + +#define ST21NFCA_DM_IS_PIPE_OPEN(p) \ + ((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN)) + +#define ST21NFCA_NFC_MODE 0x03 /* NFC_MODE parameter*/ + +static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES); + +static struct nfc_hci_gate st21nfca_gates[] = { + {NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE}, + {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE}, + {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE}, + {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE}, + {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE}, + {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE}, + {ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE}, + {ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE}, + {ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE}, + {ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE}, +}; + +struct st21nfca_pipe_info { + u8 pipe_state; + u8 src_host_id; + u8 src_gate_id; + u8 dst_host_id; + u8 dst_gate_id; +} __packed; + +/* Largest headroom needed for outgoing custom commands */ +#define ST21NFCA_CMDS_HEADROOM 7 + +static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev) +{ + int i, j, r; + struct sk_buff *skb_pipe_list, *skb_pipe_info; + struct st21nfca_pipe_info *info; + + u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST, + NFC_HCI_TERMINAL_HOST_ID + }; + u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO, + NFC_HCI_TERMINAL_HOST_ID, 0 + }; + + skb_pipe_list = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL); + if (!skb_pipe_list) { + r = -ENOMEM; + goto free_list; + } + + skb_pipe_info = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL); + if (!skb_pipe_info) { + r = -ENOMEM; + goto free_info; + } + + /* On ST21NFCA device pipes number are dynamics + * A maximum of 16 pipes can be created at the same time + * If pipes are already created, hci_dev_up will fail. + * Doing a clear all pipe is a bad idea because: + * - It does useless EEPROM cycling + * - It might cause issue for secure elements support + * (such as removing connectivity or APDU reader pipe) + * A better approach on ST21NFCA is to: + * - get a pipe list for each host. + * (eg: NFC_HCI_HOST_CONTROLLER_ID for now). + * (TODO Later on UICC HOST and eSE HOST) + * - get pipe information + * - match retrieved pipe list in st21nfca_gates + * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate + * with ST21NFCA_DEVICE_MGNT_PIPE. + * Pipe can be closed and need to be open. + */ + r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, + ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE); + if (r < 0) + goto free_info; + + /* Get pipe list */ + r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE, + ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list), + &skb_pipe_list); + if (r < 0) + goto free_info; + + /* Complete the existing gate_pipe table */ + for (i = 0; i < skb_pipe_list->len; i++) { + pipe_info[2] = skb_pipe_list->data[i]; + r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE, + ST21NFCA_DM_GETINFO, pipe_info, + sizeof(pipe_info), &skb_pipe_info); + + if (r) + continue; + + /* + * Match pipe ID and gate ID + * Output format from ST21NFC_DM_GETINFO is: + * - pipe state (1byte) + * - source hid (1byte) + * - source gid (1byte) + * - destination hid (1byte) + * - destination gid (1byte) + */ + info = (struct st21nfca_pipe_info *) skb_pipe_info->data; + for (j = 0; (j < ARRAY_SIZE(st21nfca_gates)) && + (st21nfca_gates[j].gate != info->dst_gate_id); + j++) + ; + + if (j < ARRAY_SIZE(st21nfca_gates) && + st21nfca_gates[j].gate == info->dst_gate_id && + ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) { + st21nfca_gates[j].pipe = pipe_info[2]; + hdev->gate2pipe[st21nfca_gates[j].gate] = + st21nfca_gates[j].pipe; + } + } + + /* + * 3 gates have a well known pipe ID. + * They will never appear in the pipe list + */ + if (skb_pipe_list->len + 3 < ARRAY_SIZE(st21nfca_gates)) { + for (i = skb_pipe_list->len + 3; + i < ARRAY_SIZE(st21nfca_gates); i++) { + r = nfc_hci_connect_gate(hdev, + NFC_HCI_HOST_CONTROLLER_ID, + st21nfca_gates[i].gate, + st21nfca_gates[i].pipe); + if (r < 0) + goto free_info; + } + } + + memcpy(hdev->init_data.gates, st21nfca_gates, sizeof(st21nfca_gates)); +free_info: + kfree_skb(skb_pipe_info); +free_list: + kfree_skb(skb_pipe_list); + return r; +} + +static int st21nfca_hci_open(struct nfc_hci_dev *hdev) +{ + struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); + int r; + + mutex_lock(&info->info_lock); + + if (info->state != ST21NFCA_ST_COLD) { + r = -EBUSY; + goto out; + } + + r = info->phy_ops->enable(info->phy_id); + + if (r == 0) + info->state = ST21NFCA_ST_READY; + +out: + mutex_unlock(&info->info_lock); + return r; +} + +static void st21nfca_hci_close(struct nfc_hci_dev *hdev) +{ + struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); + + mutex_lock(&info->info_lock); + + if (info->state == ST21NFCA_ST_COLD) + goto out; + + info->phy_ops->disable(info->phy_id); + info->state = ST21NFCA_ST_COLD; + +out: + mutex_unlock(&info->info_lock); +} + +static int st21nfca_hci_ready(struct nfc_hci_dev *hdev) +{ + struct sk_buff *skb; + + u8 param; + int r; + + param = NFC_HCI_UICC_HOST_ID; + r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, + NFC_HCI_ADMIN_WHITELIST, ¶m, 1); + if (r < 0) + return r; + + /* Set NFC_MODE in device management gate to enable */ + r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE, + ST21NFCA_NFC_MODE, &skb); + if (r < 0) + return r; + + if (skb->data[0] == 0) { + kfree_skb(skb); + param = 1; + + r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE, + ST21NFCA_NFC_MODE, ¶m, 1); + if (r < 0) + return r; + } + + r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, + NFC_HCI_EVT_END_OPERATION, NULL, 0); + if (r < 0) + return r; + + r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, + NFC_HCI_ID_MGMT_VERSION_SW, &skb); + if (r < 0) + return r; + + if (skb->len != FULL_VERSION_LEN) { + kfree_skb(skb); + return -EINVAL; + } + + print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ", + DUMP_PREFIX_NONE, 16, 1, + skb->data, FULL_VERSION_LEN, false); + + kfree_skb(skb); + + return 0; +} + +static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb) +{ + struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); + + return info->phy_ops->write(info->phy_id, skb); +} + +static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev, + u32 im_protocols, u32 tm_protocols) +{ + int r; + + pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n", + __func__, im_protocols, tm_protocols); + + r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, + NFC_HCI_EVT_END_OPERATION, NULL, 0); + if (r < 0) + return r; + if (im_protocols) { + /* + * enable polling according to im_protocols & tm_protocols + * - CLOSE pipe according to im_protocols & tm_protocols + */ + if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) { + r = nfc_hci_disconnect_gate(hdev, + NFC_HCI_RF_READER_B_GATE); + if (r < 0) + return r; + } + + if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) { + r = nfc_hci_disconnect_gate(hdev, + NFC_HCI_RF_READER_A_GATE); + if (r < 0) + return r; + } + + if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) { + r = nfc_hci_disconnect_gate(hdev, + ST21NFCA_RF_READER_F_GATE); + if (r < 0) + return r; + } + + if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) { + r = nfc_hci_disconnect_gate(hdev, + ST21NFCA_RF_READER_14443_3_A_GATE); + if (r < 0) + return r; + } + + if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) { + r = nfc_hci_disconnect_gate(hdev, + ST21NFCA_RF_READER_ISO15693_GATE); + if (r < 0) + return r; + } + + r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, + NFC_HCI_EVT_READER_REQUESTED, NULL, 0); + if (r < 0) + nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, + NFC_HCI_EVT_END_OPERATION, NULL, 0); + } + return r; +} + +static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa) +{ + int r; + struct sk_buff *atqa_skb = NULL; + + r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, + ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb); + if (r < 0) + goto exit; + + if (atqa_skb->len != 2) { + r = -EPROTO; + goto exit; + } + + *atqa = be16_to_cpu(*(__be16 *) atqa_skb->data); + +exit: + kfree_skb(atqa_skb); + return r; +} + +static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak) +{ + int r; + struct sk_buff *sak_skb = NULL; + + r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, + ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb); + if (r < 0) + goto exit; + + if (sak_skb->len != 1) { + r = -EPROTO; + goto exit; + } + + *sak = sak_skb->data[0]; + +exit: + kfree_skb(sak_skb); + return r; +} + +static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *gate, + int *len) +{ + int r; + struct sk_buff *uid_skb = NULL; + + r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, + ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb); + if (r < 0) + goto exit; + + if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { + r = -EPROTO; + goto exit; + } + + gate = uid_skb->data; + *len = uid_skb->len; +exit: + kfree_skb(uid_skb); + return r; +} + +static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev, + struct nfc_target *target) +{ + int r; + struct sk_buff *inventory_skb = NULL; + + r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE, + ST21NFCA_RF_READER_ISO15693_INVENTORY, + &inventory_skb); + if (r < 0) + goto exit; + + skb_pull(inventory_skb, 2); + + if (inventory_skb->len == 0 || + inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) { + r = -EPROTO; + goto exit; + } + + memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len); + target->iso15693_dsfid = inventory_skb->data[1]; + target->is_iso15693 = 1; +exit: + kfree_skb(inventory_skb); + return r; +} + +static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate, + struct nfc_target *target) +{ + int r, len; + u16 atqa; + u8 sak; + u8 uid[NFC_NFCID1_MAXSIZE]; + + switch (gate) { + case ST21NFCA_RF_READER_F_GATE: + target->supported_protocols = NFC_PROTO_FELICA_MASK; + break; + case ST21NFCA_RF_READER_14443_3_A_GATE: + /* ISO14443-3 type 1 or 2 tags */ + r = st21nfca_get_iso14443_3_atqa(hdev, &atqa); + if (r < 0) + return r; + if (atqa == 0x000c) { + target->supported_protocols = NFC_PROTO_JEWEL_MASK; + target->sens_res = 0x0c00; + } else { + r = st21nfca_get_iso14443_3_sak(hdev, &sak); + if (r < 0) + return r; + + r = st21nfca_get_iso14443_3_uid(hdev, uid, &len); + if (r < 0) + return r; + + target->supported_protocols = + nfc_hci_sak_to_protocol(sak); + if (target->supported_protocols == 0xffffffff) + return -EPROTO; + + target->sens_res = atqa; + target->sel_res = sak; + memcpy(target->nfcid1, uid, len); + target->nfcid1_len = len; + } + + break; + case ST21NFCA_RF_READER_ISO15693_GATE: + target->supported_protocols = NFC_PROTO_ISO15693_MASK; + r = st21nfca_get_iso15693_inventory(hdev, target); + if (r < 0) + return r; + break; + default: + return -EPROTO; + } + + return 0; +} + +#define ST21NFCA_CB_TYPE_READER_ISO15693 1 +static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb, + int err) +{ + struct st21nfca_hci_info *info = context; + + switch (info->async_cb_type) { + case ST21NFCA_CB_TYPE_READER_ISO15693: + if (err == 0) + skb_trim(skb, skb->len - 1); + info->async_cb(info->async_cb_context, skb, err); + break; + default: + if (err == 0) + kfree_skb(skb); + break; + } +} + +/* + * Returns: + * <= 0: driver handled the data exchange + * 1: driver doesn't especially handle, please do standard processing + */ +static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev, + struct nfc_target *target, + struct sk_buff *skb, + data_exchange_cb_t cb, void *cb_context) +{ + struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); + + pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__, + target->hci_reader_gate, skb->len); + + switch (target->hci_reader_gate) { + case ST21NFCA_RF_READER_F_GATE: + *skb_push(skb, 1) = 0x1a; + return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, + ST21NFCA_WR_XCHG_DATA, skb->data, + skb->len, cb, cb_context); + case ST21NFCA_RF_READER_14443_3_A_GATE: + *skb_push(skb, 1) = 0x1a; /* CTR, see spec:10.2.2.1 */ + + return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, + ST21NFCA_WR_XCHG_DATA, skb->data, + skb->len, cb, cb_context); + case ST21NFCA_RF_READER_ISO15693_GATE: + info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693; + info->async_cb = cb; + info->async_cb_context = cb_context; + + *skb_push(skb, 1) = 0x17; + + return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, + ST21NFCA_WR_XCHG_DATA, skb->data, + skb->len, + st21nfca_hci_data_exchange_cb, + info); + break; + default: + return 1; + } +} + +static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev, + struct nfc_target *target) +{ + u8 fwi = 0x11; + switch (target->hci_reader_gate) { + case NFC_HCI_RF_READER_A_GATE: + case NFC_HCI_RF_READER_B_GATE: + /* + * PRESENCE_CHECK on those gates is available + * However, the answer to this command is taking 3 * fwi + * if the card is no present. + * Instead, we send an empty I-Frame with a very short + * configurable fwi ~604µs. + */ + return nfc_hci_send_cmd(hdev, target->hci_reader_gate, + ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL); + case ST21NFCA_RF_READER_14443_3_A_GATE: + return nfc_hci_send_cmd(hdev, target->hci_reader_gate, + ST21NFCA_RF_READER_CMD_PRESENCE_CHECK, + NULL, 0, NULL); + default: + return -EOPNOTSUPP; + } +} + +static struct nfc_hci_ops st21nfca_hci_ops = { + .open = st21nfca_hci_open, + .close = st21nfca_hci_close, + .load_session = st21nfca_hci_load_session, + .hci_ready = st21nfca_hci_ready, + .xmit = st21nfca_hci_xmit, + .start_poll = st21nfca_hci_start_poll, + .target_from_gate = st21nfca_hci_target_from_gate, + .im_transceive = st21nfca_hci_im_transceive, + .check_presence = st21nfca_hci_check_presence, +}; + +int st21nfca_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 st21nfca_hci_info *info; + int r = 0; + int dev_num; + u32 protocols; + struct nfc_hci_init_data init_data; + unsigned long quirks = 0; + + info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL); + if (!info) { + r = -ENOMEM; + goto err_alloc_hdev; + } + + info->phy_ops = phy_ops; + info->phy_id = phy_id; + info->state = ST21NFCA_ST_COLD; + mutex_init(&info->info_lock); + + init_data.gate_count = ARRAY_SIZE(st21nfca_gates); + + memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates)); + + /* + * Session id must include the driver name + i2c bus addr + * persistent info to discriminate 2 identical chips + */ + dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES); + if (dev_num >= ST21NFCA_NUM_DEVICES) + goto err_alloc_hdev; + + scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x", + "ST21AH", dev_num); + + protocols = NFC_PROTO_JEWEL_MASK | + NFC_PROTO_MIFARE_MASK | + NFC_PROTO_FELICA_MASK | + NFC_PROTO_ISO14443_MASK | + NFC_PROTO_ISO14443_B_MASK | + NFC_PROTO_ISO15693_MASK; + + set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks); + + info->hdev = + nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks, + protocols, llc_name, + phy_headroom + ST21NFCA_CMDS_HEADROOM, + phy_tailroom, phy_payload); + + if (!info->hdev) { + pr_err("Cannot allocate nfc hdev.\n"); + r = -ENOMEM; + goto err_alloc_hdev; + } + + nfc_hci_set_clientdata(info->hdev, info); + + r = nfc_hci_register_device(info->hdev); + if (r) + goto err_regdev; + + *hdev = info->hdev; + + return 0; + +err_regdev: + nfc_hci_free_device(info->hdev); + +err_alloc_hdev: + kfree(info); + + return r; +} +EXPORT_SYMBOL(st21nfca_hci_probe); + +void st21nfca_hci_remove(struct nfc_hci_dev *hdev) +{ + struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); + + nfc_hci_unregister_device(hdev); + nfc_hci_free_device(hdev); + kfree(info); +} +EXPORT_SYMBOL(st21nfca_hci_remove); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRIVER_DESC); diff --git a/drivers/nfc/st21nfca/st21nfca.h b/drivers/nfc/st21nfca/st21nfca.h new file mode 100644 index 000000000000..334cd90bcc8c --- /dev/null +++ b/drivers/nfc/st21nfca/st21nfca.h @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2014 STMicroelectronics SAS. 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, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __LOCAL_ST21NFCA_H_ +#define __LOCAL_ST21NFCA_H_ + +#include <net/nfc/hci.h> + +#define HCI_MODE 0 + +/* framing in HCI mode */ +#define ST21NFCA_SOF_EOF_LEN 2 + +/* Almost every time value is 0 */ +#define ST21NFCA_HCI_LLC_LEN 1 + +/* Size in worst case : + * In normal case CRC len = 2 but byte stuffing + * may appear in case one CRC byte = ST21NFCA_SOF_EOF + */ +#define ST21NFCA_HCI_LLC_CRC 4 + +#define ST21NFCA_HCI_LLC_LEN_CRC (ST21NFCA_SOF_EOF_LEN + \ + ST21NFCA_HCI_LLC_LEN + \ + ST21NFCA_HCI_LLC_CRC) +#define ST21NFCA_HCI_LLC_MIN_SIZE (1 + ST21NFCA_HCI_LLC_LEN_CRC) + +/* Worst case when adding byte stuffing between each byte */ +#define ST21NFCA_HCI_LLC_MAX_PAYLOAD 29 +#define ST21NFCA_HCI_LLC_MAX_SIZE (ST21NFCA_HCI_LLC_LEN_CRC + 1 + \ + ST21NFCA_HCI_LLC_MAX_PAYLOAD) + +#define DRIVER_DESC "HCI NFC driver for ST21NFCA" + +#define ST21NFCA_HCI_MODE 0 + +#define ST21NFCA_NUM_DEVICES 256 + +int st21nfca_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 st21nfca_hci_remove(struct nfc_hci_dev *hdev); + +enum st21nfca_state { + ST21NFCA_ST_COLD, + ST21NFCA_ST_READY, +}; + +struct st21nfca_hci_info { + struct nfc_phy_ops *phy_ops; + void *phy_id; + + struct nfc_hci_dev *hdev; + + enum st21nfca_state state; + + struct mutex info_lock; + + int async_cb_type; + data_exchange_cb_t async_cb; + void *async_cb_context; + +} __packed; + +/* Reader RF commands */ +#define ST21NFCA_WR_XCHG_DATA 0x10 + +#define ST21NFCA_RF_READER_F_GATE 0x14 +#define ST21NFCA_RF_READER_F_DATARATE 0x01 +#define ST21NFCA_RF_READER_F_DATARATE_106 0x01 +#define ST21NFCA_RF_READER_F_DATARATE_212 0x02 +#define ST21NFCA_RF_READER_F_DATARATE_424 0x04 + +#endif /* __LOCAL_ST21NFCA_H_ */ |