diff options
Diffstat (limited to 'drivers/nfc/pn544.c')
| -rw-r--r-- | drivers/nfc/pn544.c | 893 |
1 files changed, 0 insertions, 893 deletions
diff --git a/drivers/nfc/pn544.c b/drivers/nfc/pn544.c deleted file mode 100644 index 724f65d8f9e..00000000000 --- a/drivers/nfc/pn544.c +++ /dev/null @@ -1,893 +0,0 @@ -/* - * Driver for the PN544 NFC chip. - * - * Copyright (C) Nokia Corporation - * - * Author: Jari Vanhala <ext-jari.vanhala@nokia.com> - * Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms 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/completion.h> -#include <linux/crc-ccitt.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/nfc/pn544.h> -#include <linux/poll.h> -#include <linux/regulator/consumer.h> -#include <linux/serial_core.h> /* for TCGETS */ -#include <linux/slab.h> - -#define DRIVER_CARD "PN544 NFC" -#define DRIVER_DESC "NFC driver for PN544" - -static struct i2c_device_id pn544_id_table[] = { - { PN544_DRIVER_NAME, 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, pn544_id_table); - -#define HCI_MODE 0 -#define FW_MODE 1 - -enum pn544_state { - PN544_ST_COLD, - PN544_ST_FW_READY, - PN544_ST_READY, -}; - -enum pn544_irq { - PN544_NONE, - PN544_INT, -}; - -struct pn544_info { - struct miscdevice miscdev; - struct i2c_client *i2c_dev; - struct regulator_bulk_data regs[3]; - - enum pn544_state state; - wait_queue_head_t read_wait; - loff_t read_offset; - enum pn544_irq read_irq; - struct mutex read_mutex; /* Serialize read_irq access */ - struct mutex mutex; /* Serialize info struct access */ - u8 *buf; - size_t buflen; -}; - -static const char reg_vdd_io[] = "Vdd_IO"; -static const char reg_vbat[] = "VBat"; -static const char reg_vsim[] = "VSim"; - -/* sysfs interface */ -static ssize_t pn544_test(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pn544_info *info = dev_get_drvdata(dev); - struct i2c_client *client = info->i2c_dev; - struct pn544_nfc_platform_data *pdata = client->dev.platform_data; - - return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test()); -} - -static int pn544_enable(struct pn544_info *info, int mode) -{ - struct pn544_nfc_platform_data *pdata; - struct i2c_client *client = info->i2c_dev; - - int r; - - r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs); - if (r < 0) - return r; - - pdata = client->dev.platform_data; - info->read_irq = PN544_NONE; - if (pdata->enable) - pdata->enable(mode); - - if (mode) { - info->state = PN544_ST_FW_READY; - dev_dbg(&client->dev, "now in FW-mode\n"); - } else { - info->state = PN544_ST_READY; - dev_dbg(&client->dev, "now in HCI-mode\n"); - } - - usleep_range(10000, 15000); - - return 0; -} - -static void pn544_disable(struct pn544_info *info) -{ - struct pn544_nfc_platform_data *pdata; - struct i2c_client *client = info->i2c_dev; - - pdata = client->dev.platform_data; - if (pdata->disable) - pdata->disable(); - - info->state = PN544_ST_COLD; - - dev_dbg(&client->dev, "Now in OFF-mode\n"); - - msleep(PN544_RESETVEN_TIME); - - info->read_irq = PN544_NONE; - regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs); -} - -static int check_crc(u8 *buf, int buflen) -{ - u8 len; - u16 crc; - - len = buf[0] + 1; - if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) { - pr_err(PN544_DRIVER_NAME - ": CRC; corrupt packet len %u (%d)\n", len, buflen); - print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, - 16, 2, buf, buflen, false); - return -EPERM; - } - crc = crc_ccitt(0xffff, buf, len - 2); - crc = ~crc; - - if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) { - pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n", - crc, buf[len-1], buf[len-2]); - - print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, - 16, 2, buf, buflen, false); - return -EPERM; - } - return 0; -} - -static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len) -{ - int r; - - if (len < 4 || len != (buf[0] + 1)) { - dev_err(&client->dev, "%s: Illegal message length: %d\n", - __func__, len); - return -EINVAL; - } - - if (check_crc(buf, len)) - return -EINVAL; - - usleep_range(3000, 6000); - - r = i2c_master_send(client, buf, len); - dev_dbg(&client->dev, "send: %d\n", r); - - if (r == -EREMOTEIO) { /* Retry, chip was in standby */ - usleep_range(6000, 10000); - r = i2c_master_send(client, buf, len); - dev_dbg(&client->dev, "send2: %d\n", r); - } - - if (r != len) - return -EREMOTEIO; - - return r; -} - -static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen) -{ - int r; - u8 len; - - /* - * You could read a packet in one go, but then you'd need to read - * max size and rest would be 0xff fill, so we do split reads. - */ - r = i2c_master_recv(client, &len, 1); - dev_dbg(&client->dev, "recv1: %d\n", r); - - if (r != 1) - return -EREMOTEIO; - - if (len < PN544_LLC_HCI_OVERHEAD) - len = PN544_LLC_HCI_OVERHEAD; - else if (len > (PN544_MSG_MAX_SIZE - 1)) - len = PN544_MSG_MAX_SIZE - 1; - - if (1 + len > buflen) /* len+(data+crc16) */ - return -EMSGSIZE; - - buf[0] = len; - - r = i2c_master_recv(client, buf + 1, len); - dev_dbg(&client->dev, "recv2: %d\n", r); - - if (r != len) - return -EREMOTEIO; - - usleep_range(3000, 6000); - - return r + 1; -} - -static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len) -{ - int r; - - dev_dbg(&client->dev, "%s\n", __func__); - - if (len < PN544_FW_HEADER_SIZE || - (PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len) - return -EINVAL; - - r = i2c_master_send(client, buf, len); - dev_dbg(&client->dev, "fw send: %d\n", r); - - if (r == -EREMOTEIO) { /* Retry, chip was in standby */ - usleep_range(6000, 10000); - r = i2c_master_send(client, buf, len); - dev_dbg(&client->dev, "fw send2: %d\n", r); - } - - if (r != len) - return -EREMOTEIO; - - return r; -} - -static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen) -{ - int r, len; - - if (buflen < PN544_FW_HEADER_SIZE) - return -EINVAL; - - r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE); - dev_dbg(&client->dev, "FW recv1: %d\n", r); - - if (r < 0) - return r; - - if (r < PN544_FW_HEADER_SIZE) - return -EINVAL; - - len = (buf[1] << 8) + buf[2]; - if (len == 0) /* just header, no additional data */ - return r; - - if (len > buflen - PN544_FW_HEADER_SIZE) - return -EMSGSIZE; - - r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len); - dev_dbg(&client->dev, "fw recv2: %d\n", r); - - if (r != len) - return -EINVAL; - - return r + PN544_FW_HEADER_SIZE; -} - -static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id) -{ - struct pn544_info *info = dev_id; - struct i2c_client *client = info->i2c_dev; - - BUG_ON(!info); - BUG_ON(irq != info->i2c_dev->irq); - - dev_dbg(&client->dev, "IRQ\n"); - - mutex_lock(&info->read_mutex); - info->read_irq = PN544_INT; - mutex_unlock(&info->read_mutex); - - wake_up_interruptible(&info->read_wait); - - return IRQ_HANDLED; -} - -static enum pn544_irq pn544_irq_state(struct pn544_info *info) -{ - enum pn544_irq irq; - - mutex_lock(&info->read_mutex); - irq = info->read_irq; - mutex_unlock(&info->read_mutex); - /* - * XXX: should we check GPIO-line status directly? - * return pdata->irq_status() ? PN544_INT : PN544_NONE; - */ - - return irq; -} - -static ssize_t pn544_read(struct file *file, char __user *buf, - size_t count, loff_t *offset) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - enum pn544_irq irq; - size_t len; - int r = 0; - - dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__, - info, count); - - mutex_lock(&info->mutex); - - if (info->state == PN544_ST_COLD) { - r = -ENODEV; - goto out; - } - - irq = pn544_irq_state(info); - if (irq == PN544_NONE) { - if (file->f_flags & O_NONBLOCK) { - r = -EAGAIN; - goto out; - } - - if (wait_event_interruptible(info->read_wait, - (info->read_irq == PN544_INT))) { - r = -ERESTARTSYS; - goto out; - } - } - - if (info->state == PN544_ST_FW_READY) { - len = min(count, info->buflen); - - mutex_lock(&info->read_mutex); - r = pn544_fw_read(info->i2c_dev, info->buf, len); - info->read_irq = PN544_NONE; - mutex_unlock(&info->read_mutex); - - if (r < 0) { - dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r); - goto out; - } - - print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE, - 16, 2, info->buf, r, false); - - *offset += r; - if (copy_to_user(buf, info->buf, r)) { - r = -EFAULT; - goto out; - } - } else { - len = min(count, info->buflen); - - mutex_lock(&info->read_mutex); - r = pn544_i2c_read(info->i2c_dev, info->buf, len); - info->read_irq = PN544_NONE; - mutex_unlock(&info->read_mutex); - - if (r < 0) { - dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r); - goto out; - } - print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE, - 16, 2, info->buf, r, false); - - *offset += r; - if (copy_to_user(buf, info->buf, r)) { - r = -EFAULT; - goto out; - } - } - -out: - mutex_unlock(&info->mutex); - - return r; -} - -static unsigned int pn544_poll(struct file *file, poll_table *wait) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - int r = 0; - - dev_dbg(&client->dev, "%s: info: %p\n", __func__, info); - - mutex_lock(&info->mutex); - - if (info->state == PN544_ST_COLD) { - r = -ENODEV; - goto out; - } - - poll_wait(file, &info->read_wait, wait); - - if (pn544_irq_state(info) == PN544_INT) { - r = POLLIN | POLLRDNORM; - goto out; - } -out: - mutex_unlock(&info->mutex); - - return r; -} - -static ssize_t pn544_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - ssize_t len; - int r; - - dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__, - info, count); - - mutex_lock(&info->mutex); - - if (info->state == PN544_ST_COLD) { - r = -ENODEV; - goto out; - } - - /* - * XXX: should we detect rset-writes and clean possible - * read_irq state - */ - if (info->state == PN544_ST_FW_READY) { - size_t fw_len; - - if (count < PN544_FW_HEADER_SIZE) { - r = -EINVAL; - goto out; - } - - len = min(count, info->buflen); - if (copy_from_user(info->buf, buf, len)) { - r = -EFAULT; - goto out; - } - - print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE, - 16, 2, info->buf, len, false); - - fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) + - info->buf[2]; - - if (len > fw_len) /* 1 msg at a time */ - len = fw_len; - - r = pn544_fw_write(info->i2c_dev, info->buf, len); - } else { - if (count < PN544_LLC_MIN_SIZE) { - r = -EINVAL; - goto out; - } - - len = min(count, info->buflen); - if (copy_from_user(info->buf, buf, len)) { - r = -EFAULT; - goto out; - } - - print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE, - 16, 2, info->buf, len, false); - - if (len > (info->buf[0] + 1)) /* 1 msg at a time */ - len = info->buf[0] + 1; - - r = pn544_i2c_write(info->i2c_dev, info->buf, len); - } -out: - mutex_unlock(&info->mutex); - - return r; - -} - -static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - struct pn544_nfc_platform_data *pdata; - unsigned int val; - int r = 0; - - dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd); - - mutex_lock(&info->mutex); - - if (info->state == PN544_ST_COLD) { - r = -ENODEV; - goto out; - } - - pdata = info->i2c_dev->dev.platform_data; - switch (cmd) { - case PN544_GET_FW_MODE: - dev_dbg(&client->dev, "%s: PN544_GET_FW_MODE\n", __func__); - - val = (info->state == PN544_ST_FW_READY); - if (copy_to_user((void __user *)arg, &val, sizeof(val))) { - r = -EFAULT; - goto out; - } - - break; - - case PN544_SET_FW_MODE: - dev_dbg(&client->dev, "%s: PN544_SET_FW_MODE\n", __func__); - - if (copy_from_user(&val, (void __user *)arg, sizeof(val))) { - r = -EFAULT; - goto out; - } - - if (val) { - if (info->state == PN544_ST_FW_READY) - break; - - pn544_disable(info); - r = pn544_enable(info, FW_MODE); - if (r < 0) - goto out; - } else { - if (info->state == PN544_ST_READY) - break; - pn544_disable(info); - r = pn544_enable(info, HCI_MODE); - if (r < 0) - goto out; - } - file->f_pos = info->read_offset; - break; - - case TCGETS: - dev_dbg(&client->dev, "%s: TCGETS\n", __func__); - - r = -ENOIOCTLCMD; - break; - - default: - dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd); - r = -ENOIOCTLCMD; - break; - } - -out: - mutex_unlock(&info->mutex); - - return r; -} - -static int pn544_open(struct inode *inode, struct file *file) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - int r = 0; - - dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__, - info, info->i2c_dev); - - mutex_lock(&info->mutex); - - /* - * Only 1 at a time. - * XXX: maybe user (counter) would work better - */ - if (info->state != PN544_ST_COLD) { - r = -EBUSY; - goto out; - } - - file->f_pos = info->read_offset; - r = pn544_enable(info, HCI_MODE); - -out: - mutex_unlock(&info->mutex); - return r; -} - -static int pn544_close(struct inode *inode, struct file *file) -{ - struct pn544_info *info = container_of(file->private_data, - struct pn544_info, miscdev); - struct i2c_client *client = info->i2c_dev; - - dev_dbg(&client->dev, "%s: info: %p, client %p\n", - __func__, info, info->i2c_dev); - - mutex_lock(&info->mutex); - pn544_disable(info); - mutex_unlock(&info->mutex); - - return 0; -} - -static const struct file_operations pn544_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = pn544_read, - .write = pn544_write, - .poll = pn544_poll, - .open = pn544_open, - .release = pn544_close, - .unlocked_ioctl = pn544_ioctl, -}; - -#ifdef CONFIG_PM -static int pn544_suspend(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - struct pn544_info *info; - int r = 0; - - dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client); - - info = i2c_get_clientdata(client); - dev_info(&client->dev, "%s: info: %p, client %p\n", __func__, - info, client); - - mutex_lock(&info->mutex); - - switch (info->state) { - case PN544_ST_FW_READY: - /* Do not suspend while upgrading FW, please! */ - r = -EPERM; - break; - - case PN544_ST_READY: - /* - * CHECK: Device should be in standby-mode. No way to check? - * Allowing low power mode for the regulator is potentially - * dangerous if pn544 does not go to suspension. - */ - break; - - case PN544_ST_COLD: - break; - }; - - mutex_unlock(&info->mutex); - return r; -} - -static int pn544_resume(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - struct pn544_info *info = i2c_get_clientdata(client); - int r = 0; - - dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__, - info, client); - - mutex_lock(&info->mutex); - - switch (info->state) { - case PN544_ST_READY: - /* - * CHECK: If regulator low power mode is allowed in - * pn544_suspend, we should go back to normal mode - * here. - */ - break; - - case PN544_ST_COLD: - break; - - case PN544_ST_FW_READY: - break; - }; - - mutex_unlock(&info->mutex); - - return r; -} - -static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume); -#endif - -static struct device_attribute pn544_attr = - __ATTR(nfc_test, S_IRUGO, pn544_test, NULL); - -static int __devinit pn544_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct pn544_info *info; - 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); - - /* private data allocation */ - info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL); - if (!info) { - dev_err(&client->dev, - "Cannot allocate memory for pn544_info.\n"); - r = -ENOMEM; - goto err_info_alloc; - } - - info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER); - info->buf = kzalloc(info->buflen, GFP_KERNEL); - if (!info->buf) { - dev_err(&client->dev, - "Cannot allocate memory for pn544_info->buf.\n"); - r = -ENOMEM; - goto err_buf_alloc; - } - - info->regs[0].supply = reg_vdd_io; - info->regs[1].supply = reg_vbat; - info->regs[2].supply = reg_vsim; - r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs), - info->regs); - if (r < 0) - goto err_kmalloc; - - info->i2c_dev = client; - info->state = PN544_ST_COLD; - info->read_irq = PN544_NONE; - mutex_init(&info->read_mutex); - mutex_init(&info->mutex); - init_waitqueue_head(&info->read_wait); - i2c_set_clientdata(client, info); - pdata = client->dev.platform_data; - if (!pdata) { - dev_err(&client->dev, "No platform data\n"); - r = -EINVAL; - goto err_reg; - } - - if (!pdata->request_resources) { - dev_err(&client->dev, "request_resources() missing\n"); - r = -EINVAL; - goto err_reg; - } - - r = pdata->request_resources(client); - if (r) { - dev_err(&client->dev, "Cannot get platform resources\n"); - goto err_reg; - } - - r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn, - IRQF_TRIGGER_RISING, PN544_DRIVER_NAME, - info); - if (r < 0) { - dev_err(&client->dev, "Unable to register IRQ handler\n"); - goto err_res; - } - - /* If we don't have the test we don't need the sysfs file */ - if (pdata->test) { - r = device_create_file(&client->dev, &pn544_attr); - if (r) { - dev_err(&client->dev, - "sysfs registration failed, error %d\n", r); - goto err_irq; - } - } - - info->miscdev.minor = MISC_DYNAMIC_MINOR; - info->miscdev.name = PN544_DRIVER_NAME; - info->miscdev.fops = &pn544_fops; - info->miscdev.parent = &client->dev; - r = misc_register(&info->miscdev); - if (r < 0) { - dev_err(&client->dev, "Device registration failed\n"); - goto err_sysfs; - } - - dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n", - __func__, info, pdata, client); - - return 0; - -err_sysfs: - if (pdata->test) - device_remove_file(&client->dev, &pn544_attr); -err_irq: - free_irq(client->irq, info); -err_res: - if (pdata->free_resources) - pdata->free_resources(); -err_reg: - regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs); -err_kmalloc: - kfree(info->buf); -err_buf_alloc: - kfree(info); -err_info_alloc: - return r; -} - -static __devexit int pn544_remove(struct i2c_client *client) -{ - struct pn544_info *info = i2c_get_clientdata(client); - struct pn544_nfc_platform_data *pdata = client->dev.platform_data; - - dev_dbg(&client->dev, "%s\n", __func__); - - misc_deregister(&info->miscdev); - if (pdata->test) - device_remove_file(&client->dev, &pn544_attr); - - if (info->state != PN544_ST_COLD) { - if (pdata->disable) - pdata->disable(); - - info->read_irq = PN544_NONE; - } - - free_irq(client->irq, info); - if (pdata->free_resources) - pdata->free_resources(); - - regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs); - kfree(info->buf); - kfree(info); - - return 0; -} - -static struct i2c_driver pn544_driver = { - .driver = { - .name = PN544_DRIVER_NAME, -#ifdef CONFIG_PM - .pm = &pn544_pm_ops, -#endif - }, - .probe = pn544_probe, - .id_table = pn544_id_table, - .remove = __devexit_p(pn544_remove), -}; - -static int __init pn544_init(void) -{ - int r; - - pr_debug(DRIVER_DESC ": %s\n", __func__); - - r = i2c_add_driver(&pn544_driver); - if (r) { - pr_err(PN544_DRIVER_NAME ": driver registration failed\n"); - return r; - } - - return 0; -} - -static void __exit pn544_exit(void) -{ - i2c_del_driver(&pn544_driver); - pr_info(DRIVER_DESC ", Exiting.\n"); -} - -module_init(pn544_init); -module_exit(pn544_exit); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION(DRIVER_DESC); |