diff options
| -rwxr-xr-x[-rw-r--r--] | drivers/misc/Makefile | 0 | ||||
| -rwxr-xr-x | drivers/misc/pn544.c | 353 | ||||
| -rwxr-xr-x | include/linux/pn544.h | 33 |
3 files changed, 386 insertions, 0 deletions
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 03afd77..03afd77 100644..100755 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile diff --git a/drivers/misc/pn544.c b/drivers/misc/pn544.c new file mode 100755 index 0000000..dee6c4b --- /dev/null +++ b/drivers/misc/pn544.c @@ -0,0 +1,353 @@ +/* + * Copyright (C) 2010 Trusted Logic S.A. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/i2c.h> +#include <linux/irq.h> +#include <linux/jiffies.h> +#include <linux/uaccess.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/miscdevice.h> +#include <linux/spinlock.h> +#include <linux/pn544.h> + +#define MAX_BUFFER_SIZE 256 + +struct pn544_dev { + wait_queue_head_t read_wq; + struct mutex read_mutex; + struct i2c_client *client; + struct miscdevice pn544_device; + unsigned int ven_gpio; + unsigned int firm_gpio; + unsigned int irq_gpio; + bool irq_enabled; + spinlock_t irq_enabled_lock; +}; + +static void pn544_disable_irq(struct pn544_dev *pn544_dev) +{ + unsigned long flags; + + spin_lock_irqsave(&pn544_dev->irq_enabled_lock, flags); + if (pn544_dev->irq_enabled) { + disable_irq_nosync(pn544_dev->client->irq); + pn544_dev->irq_enabled = false; + } + spin_unlock_irqrestore(&pn544_dev->irq_enabled_lock, flags); +} + +static irqreturn_t pn544_dev_irq_handler(int irq, void *dev_id) +{ + struct pn544_dev *pn544_dev = dev_id; + + pn544_disable_irq(pn544_dev); + + /* Wake up waiting readers */ + wake_up(&pn544_dev->read_wq); + + return IRQ_HANDLED; +} + +static ssize_t pn544_dev_read(struct file *filp, char __user *buf, + size_t count, loff_t *offset) +{ + struct pn544_dev *pn544_dev = filp->private_data; + char tmp[MAX_BUFFER_SIZE]; + int ret; + + if (count > MAX_BUFFER_SIZE) + count = MAX_BUFFER_SIZE; + + pr_debug("%s : reading %zu bytes.\n", __func__, count); + + mutex_lock(&pn544_dev->read_mutex); + + if (!gpio_get_value(pn544_dev->irq_gpio)) { + if (filp->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + goto fail; + } + + pn544_dev->irq_enabled = true; + enable_irq(pn544_dev->client->irq); + ret = wait_event_interruptible(pn544_dev->read_wq, + gpio_get_value(pn544_dev->irq_gpio)); + + pn544_disable_irq(pn544_dev); + + if (ret) + goto fail; + + } + + /* Read data */ + ret = i2c_master_recv(pn544_dev->client, tmp, count); + mutex_unlock(&pn544_dev->read_mutex); + + if (ret < 0) { + pr_err("%s: i2c_master_recv returned %d\n", __func__, ret); + return ret; + } + if (ret > count) { + pr_err("%s: received too many bytes from i2c (%d)\n", + __func__, ret); + return -EIO; + } + if (copy_to_user(buf, tmp, ret)) { + pr_warning("%s : failed to copy to user space\n", __func__); + return -EFAULT; + } + return ret; + +fail: + mutex_unlock(&pn544_dev->read_mutex); + return ret; +} + +static ssize_t pn544_dev_write(struct file *filp, const char __user *buf, + size_t count, loff_t *offset) +{ + struct pn544_dev *pn544_dev; + char tmp[MAX_BUFFER_SIZE]; + int ret; + + pn544_dev = filp->private_data; + + if (count > MAX_BUFFER_SIZE) + count = MAX_BUFFER_SIZE; + + if (copy_from_user(tmp, buf, count)) { + pr_err("%s : failed to copy from user space\n", __func__); + return -EFAULT; + } + + pr_debug("%s : writing %zu bytes.\n", __func__, count); + /* Write data */ + ret = i2c_master_send(pn544_dev->client, tmp, count); + if (ret != count) { + pr_err("%s : i2c_master_send returned %d\n", __func__, ret); + ret = -EIO; + } + + return ret; +} + +static int pn544_dev_open(struct inode *inode, struct file *filp) +{ + struct pn544_dev *pn544_dev = container_of(filp->private_data, + struct pn544_dev, + pn544_device); + + filp->private_data = pn544_dev; + + pr_debug("%s : %d,%d\n", __func__, imajor(inode), iminor(inode)); + + return 0; +} + +static long pn544_dev_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +{ + struct pn544_dev *pn544_dev = filp->private_data; + + switch (cmd) { + case PN544_SET_PWR: + if (arg > 1) { /* enable with firmware download */ + pr_info("%s power on with firmware\n", __func__); + gpio_set_value(pn544_dev->firm_gpio, 1); + gpio_set_value(pn544_dev->ven_gpio, 1); + msleep(3); + } else if (arg == 1) { /* enable */ + pr_info("%s power on\n", __func__); + gpio_set_value(pn544_dev->firm_gpio, 0); + gpio_set_value(pn544_dev->ven_gpio, 1); + msleep(3); + } else { + pr_info("%s power off\n", __func__); + gpio_set_value(pn544_dev->firm_gpio, 0); + gpio_set_value(pn544_dev->ven_gpio, 0); + msleep(7); + } + break; + default: + pr_err("%s bad ioctl %u\n", __func__, cmd); + return -EINVAL; + } + + return 0; +} + +static const struct file_operations pn544_dev_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = pn544_dev_read, + .write = pn544_dev_write, + .open = pn544_dev_open, + .unlocked_ioctl = pn544_dev_ioctl, +}; + +static int pn544_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct pn544_i2c_platform_data *platform_data; + struct pn544_dev *pn544_dev; + + platform_data = client->dev.platform_data; + + if (platform_data == NULL) { + pr_err("%s : nfc probe fail\n", __func__); + return -ENODEV; + } + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + pr_err("%s : need I2C_FUNC_I2C\n", __func__); + return -ENODEV; + } + + ret = gpio_request(platform_data->irq_gpio, "nfc_int"); + if (ret) + return -ENODEV; + ret = gpio_request(platform_data->ven_gpio, "nfc_ven"); + if (ret) + goto err_ven; + ret = gpio_request(platform_data->firm_gpio, "nfc_firm"); + if (ret) + goto err_firm; + + pn544_dev = kzalloc(sizeof(*pn544_dev), GFP_KERNEL); + if (pn544_dev == NULL) { + dev_err(&client->dev, + "failed to allocate memory for module data\n"); + ret = -ENOMEM; + goto err_exit; + } + + pn544_dev->irq_gpio = platform_data->irq_gpio; + pn544_dev->ven_gpio = platform_data->ven_gpio; + pn544_dev->firm_gpio = platform_data->firm_gpio; + pn544_dev->client = client; + + /* init mutex and queues */ + init_waitqueue_head(&pn544_dev->read_wq); + mutex_init(&pn544_dev->read_mutex); + spin_lock_init(&pn544_dev->irq_enabled_lock); + + pn544_dev->pn544_device.minor = MISC_DYNAMIC_MINOR; + pn544_dev->pn544_device.name = "pn544"; + pn544_dev->pn544_device.fops = &pn544_dev_fops; + + ret = misc_register(&pn544_dev->pn544_device); + if (ret) { + pr_err("%s : misc_register failed\n", __FILE__); + goto err_misc_register; + } + + /* request irq. the irq is set whenever the chip has data available + * for reading. it is cleared when all data has been read. + */ + pr_info("%s : requesting IRQ %d\n", __func__, client->irq); + pn544_dev->irq_enabled = true; + ret = request_irq(client->irq, pn544_dev_irq_handler, + IRQF_TRIGGER_HIGH, client->name, pn544_dev); + if (ret) { + dev_err(&client->dev, "request_irq failed\n"); + goto err_request_irq_failed; + } + pn544_disable_irq(pn544_dev); + i2c_set_clientdata(client, pn544_dev); + + return 0; + +err_request_irq_failed: + misc_deregister(&pn544_dev->pn544_device); +err_misc_register: + mutex_destroy(&pn544_dev->read_mutex); + kfree(pn544_dev); +err_exit: + gpio_free(platform_data->firm_gpio); +err_firm: + gpio_free(platform_data->ven_gpio); +err_ven: + gpio_free(platform_data->irq_gpio); + return ret; +} + +static int pn544_remove(struct i2c_client *client) +{ + struct pn544_dev *pn544_dev; + + pn544_dev = i2c_get_clientdata(client); + free_irq(client->irq, pn544_dev); + misc_deregister(&pn544_dev->pn544_device); + mutex_destroy(&pn544_dev->read_mutex); + gpio_free(pn544_dev->irq_gpio); + gpio_free(pn544_dev->ven_gpio); + gpio_free(pn544_dev->firm_gpio); + kfree(pn544_dev); + + return 0; +} + +static const struct i2c_device_id pn544_id[] = { + { "pn544", 0 }, + { } +}; + +static struct i2c_driver pn544_driver = { + .id_table = pn544_id, + .probe = pn544_probe, + .remove = pn544_remove, + .driver = { + .owner = THIS_MODULE, + .name = "pn544", + }, +}; + +/* + * module load/unload record keeping + */ + +static int __init pn544_dev_init(void) +{ + pr_info("Loading pn544 driver\n"); + return i2c_add_driver(&pn544_driver); +} +module_init(pn544_dev_init); + +static void __exit pn544_dev_exit(void) +{ + pr_info("Unloading pn544 driver\n"); + i2c_del_driver(&pn544_driver); +} +module_exit(pn544_dev_exit); + +MODULE_AUTHOR("Sylvain Fonteneau"); +MODULE_DESCRIPTION("NFC PN544 driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/pn544.h b/include/linux/pn544.h new file mode 100755 index 0000000..44ed70f --- /dev/null +++ b/include/linux/pn544.h @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2010 Trusted Logic S.A. + * + * 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 + */ + +#define PN544_MAGIC 0xE9 + +/* + * PN544 power control via ioctl + * PN544_SET_PWR(0): power off + * PN544_SET_PWR(1): power on + * PN544_SET_PWR(>1): power on with firmware download enabled + */ +#define PN544_SET_PWR _IOW(PN544_MAGIC, 0x01, unsigned int) + +struct pn544_i2c_platform_data { + unsigned int irq_gpio; + unsigned int ven_gpio; + unsigned int firm_gpio; +}; |