diff options
author | Anita Kar <akar@nvidia.com> | 2012-12-12 14:04:58 +0530 |
---|---|---|
committer | Dan Willemsen <dwillemsen@nvidia.com> | 2013-09-14 01:32:55 -0700 |
commit | 4c8cb0a5b1cac45ac1eac334b1cb2b67512d228f (patch) | |
tree | 9817603727bdf8127417649756de3f4c14152eef /drivers/nfc | |
parent | aa5a7b3728f2aa5b096eb5607ff4d1d60c02529b (diff) |
nfc: add support for brcm2079x driver
we have received this driver from BRCM support
website. Pushing driver in original.
Bug 1190304
Reviewed-on: http://git-master/r/172565
(cherry picked from commit 13def7b53c52f4c68f9d64c296ab0ac3810dc972)
Change-Id: I56f7a3e1391a78db73ed91527e21f717d0f599b3
Signed-off-by: Anita Kar <akar@nvidia.com>
Reviewed-on: http://git-master/r/187411
Reviewed-by: Rakesh Goyal <rgoyal@nvidia.com>
Tested-by: Rakesh Goyal <rgoyal@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'drivers/nfc')
-rwxr-xr-x[-rw-r--r--] | drivers/nfc/Kconfig | 12 | ||||
-rw-r--r-- | drivers/nfc/Makefile | 1 | ||||
-rwxr-xr-x | drivers/nfc/bcm2079x-i2c.c | 520 |
3 files changed, 533 insertions, 0 deletions
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig index 74a852e4e41f..10b176173a64 100644..100755 --- a/drivers/nfc/Kconfig +++ b/drivers/nfc/Kconfig @@ -5,6 +5,17 @@ menu "Near Field Communication (NFC) devices" depends on NFC +config BCM2079X_NFC + tristate "BCM2079X NFC driver" + depends on I2C + select CRC_CCITT + default n + ---help--- + Say yes if you want BCM2079X Near Field Communication driver. + This is for i2c connected version. If unsure, say N here. + To compile this driver as a module, choose m here. The module will + be called bcm2079x. + config NFC_PN533 tristate "NXP PN533 USB driver" depends on USB @@ -18,6 +29,7 @@ config NFC_PN533 config NFC_WILINK tristate "Texas Instruments NFC WiLink driver" depends on TI_ST && NFC_NCI + default n help This enables the NFC driver for Texas Instrument's BT/FM/GPS/NFC combo devices. This makes use of shared transport line discipline diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile index aa6bd657ef40..f71db78f9758 100644 --- a/drivers/nfc/Makefile +++ b/drivers/nfc/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_NFC_PN544) += pn544/ obj-$(CONFIG_NFC_MICROREAD) += microread/ +obj-$(CONFIG_BCM2079X_NFC) += bcm2079x-i2c.o obj-$(CONFIG_NFC_PN533) += pn533.o obj-$(CONFIG_NFC_WILINK) += nfcwilink.o obj-$(CONFIG_NFC_MEI_PHY) += mei_phy.o diff --git a/drivers/nfc/bcm2079x-i2c.c b/drivers/nfc/bcm2079x-i2c.c new file mode 100755 index 000000000000..bf516d4348ee --- /dev/null +++ b/drivers/nfc/bcm2079x-i2c.c @@ -0,0 +1,520 @@ +/* + * Copyright (C) 2012 Broadcom Corporation. + * + * 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/poll.h> +#include <linux/version.h> + +#include <linux/nfc/bcm2079x.h> + +#define TRUE 1 +#define FALSE 0 +#define STATE_HIGH 1 +#define STATE_LOW 0 + +/* end of compile options */ + +/* do not change below */ +#define MAX_BUFFER_SIZE 780 + + /* Read data */ +#define PACKET_HEADER_SIZE_NCI (4) +#define PACKET_HEADER_SIZE_HCI (3) +#define PACKET_TYPE_NCI (16) +#define PACKET_TYPE_HCIEV (4) +#define MAX_PACKET_SIZE (PACKET_HEADER_SIZE_NCI + 255) + +struct bcm2079x_dev { + wait_queue_head_t read_wq; + struct mutex read_mutex; + struct i2c_client *client; + struct miscdevice bcm2079x_device; + unsigned int wake_gpio; + unsigned int en_gpio; + unsigned int irq_gpio; + bool irq_enabled; + spinlock_t irq_enabled_lock; + unsigned int error_write; + unsigned int error_read; + unsigned int count_read; + unsigned int count_irq; + int original_address; +}; + +static void bcm2079x_init_stat(struct bcm2079x_dev *bcm2079x_dev) +{ + bcm2079x_dev->error_write = 0; + bcm2079x_dev->error_read = 0; + bcm2079x_dev->count_read = 0; + bcm2079x_dev->count_irq = 0; +} + +static void bcm2079x_disable_irq(struct bcm2079x_dev *bcm2079x_dev) +{ + unsigned long flags; + spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags); + if (bcm2079x_dev->irq_enabled) { + disable_irq_nosync(bcm2079x_dev->client->irq); + bcm2079x_dev->irq_enabled = false; + } + spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags); +} + +static void bcm2079x_enable_irq(struct bcm2079x_dev *bcm2079x_dev) +{ + unsigned long flags; + spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags); + if (!bcm2079x_dev->irq_enabled) { + bcm2079x_dev->irq_enabled = true; + enable_irq(bcm2079x_dev->client->irq); + } + spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags); +} + +/* + The alias address 0x79, when sent as a 7-bit address from the host processor + will match the first byte (highest 2 bits) of the default client address + (0x1FA) that is programmed in bcm20791. + When used together with the first byte (0xFA) of the byte sequence below, + it can be used to address the bcm20791 in a system that does not support + 10-bit address and change the default address to 0x38. + the new address can be changed by changing the CLIENT_ADDRESS below if 0x38 + conflicts with other device on the same i2c bus. + */ +#define ALIAS_ADDRESS 0x79 + +static void set_client_addr(struct bcm2079x_dev *bcm2079x_dev, int addr) +{ + struct i2c_client *client = bcm2079x_dev->client; + client->addr = addr; + if (addr > 0x7F) + client->flags |= I2C_CLIENT_TEN; + else + client->flags &= ~I2C_CLIENT_TEN; + + dev_info(&client->dev, + "set_client_addr changed to (0x%04X) flag = %04x\n", + client->addr, client->flags); +} + +static void change_client_addr(struct bcm2079x_dev *bcm2079x_dev, int addr) +{ + struct i2c_client *client; + int ret; + int i; + int offset = 1; + char addr_data[] = { + 0xEE, 0xF2, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x00 + }; + + client = bcm2079x_dev->client; + if ((client->flags & I2C_CLIENT_TEN) == I2C_CLIENT_TEN) { + client->addr = ALIAS_ADDRESS; + client->flags &= ~I2C_CLIENT_TEN; + offset = 0; + } + + addr_data[5] = addr & 0xFF; + ret = 0; + for (i = 1; i < sizeof(addr_data) - 1; ++i) + ret += addr_data[i]; + addr_data[sizeof(addr_data) - 1] = (ret & 0xFF); + dev_info(&client->dev, + "change_client_addr from (0x%04X) flag = "\ + "%04x, addr_data[%d] = %02x\n", + client->addr, client->flags, sizeof(addr_data) - 1, + addr_data[sizeof(addr_data) - 1]); + ret = i2c_master_send(client, addr_data+offset, sizeof(addr_data)-offset); + client->addr = addr_data[5]; + dev_info(&client->dev, + "change_client_addr to (0x%04X) flag = %04x, ret = %d\n", + client->addr, client->flags, ret); +} + +static irqreturn_t bcm2079x_dev_irq_handler(int irq, void *dev_id) +{ + struct bcm2079x_dev *bcm2079x_dev = dev_id; + unsigned long flags; + + spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags); + bcm2079x_dev->count_irq++; + spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags); + wake_up(&bcm2079x_dev->read_wq); + + return IRQ_HANDLED; +} + +static unsigned int bcm2079x_dev_poll(struct file *filp, poll_table *wait) +{ + struct bcm2079x_dev *bcm2079x_dev = filp->private_data; + unsigned int mask = 0; + unsigned long flags; + + poll_wait(filp, &bcm2079x_dev->read_wq, wait); + + spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags); + if (bcm2079x_dev->count_irq > 0) + mask |= POLLIN | POLLRDNORM; + spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags); + + return mask; +} + +static ssize_t bcm2079x_dev_read(struct file *filp, char __user *buf, + size_t count, loff_t *offset) +{ + struct bcm2079x_dev *bcm2079x_dev = filp->private_data; + unsigned char tmp[MAX_BUFFER_SIZE]; + int total, len, ret; + + total = 0; + len = 0; + if (bcm2079x_dev->count_irq > 0) + bcm2079x_dev->count_irq--; + + bcm2079x_dev->count_read++; + if (count > MAX_BUFFER_SIZE) + count = MAX_BUFFER_SIZE; + + mutex_lock(&bcm2079x_dev->read_mutex); + + /** Read the first 4 bytes to include the length of the NCI or HCI packet. + **/ + ret = i2c_master_recv(bcm2079x_dev->client, tmp, 4); + if (ret == 4) { + total = ret; + /** First byte is the packet type + **/ + switch(tmp[0]) { + case PACKET_TYPE_NCI: + len = tmp[PACKET_HEADER_SIZE_NCI-1]; + break; + + case PACKET_TYPE_HCIEV: + len = tmp[PACKET_HEADER_SIZE_HCI-1]; + if (len == 0) + total--; /*Since payload is 0, decrement total size (from 4 to 3) */ + else + len--; /*First byte of payload is in tmp[3] already */ + break; + + default: + len = 0; /*Unknown packet byte */ + break; + } /* switch*/ + + /** make sure full packet fits in the buffer + **/ + if (len > 0 && (len + total) <= count) { + /** read the remainder of the packet. + **/ + ret = i2c_master_recv(bcm2079x_dev->client, tmp+total, len); + if (ret == len) + total += len; + } /* if */ + } /* if */ + + mutex_unlock(&bcm2079x_dev->read_mutex); + + if (total > count || copy_to_user(buf, tmp, total)) { + dev_err(&bcm2079x_dev->client->dev, + "failed to copy to user space, total = %d\n", total); + total = -EFAULT; + bcm2079x_dev->error_read++; + } + + return total; +} + +static ssize_t bcm2079x_dev_write(struct file *filp, const char __user *buf, + size_t count, loff_t *offset) +{ + struct bcm2079x_dev *bcm2079x_dev = filp->private_data; + char tmp[MAX_BUFFER_SIZE]; + int ret; + + if (count > MAX_BUFFER_SIZE) { + dev_err(&bcm2079x_dev->client->dev, "out of memory\n"); + return -ENOMEM; + } + + if (copy_from_user(tmp, buf, count)) { + dev_err(&bcm2079x_dev->client->dev, + "failed to copy from user space\n"); + return -EFAULT; + } + + mutex_lock(&bcm2079x_dev->read_mutex); + /* Write data */ + + ret = i2c_master_send(bcm2079x_dev->client, tmp, count); + if (ret != count) { + dev_err(&bcm2079x_dev->client->dev, + "failed to write %d\n", ret); + ret = -EIO; + bcm2079x_dev->error_write++; + } + mutex_unlock(&bcm2079x_dev->read_mutex); + + return ret; +} + +static int bcm2079x_dev_open(struct inode *inode, struct file *filp) +{ + int ret = 0; + + struct bcm2079x_dev *bcm2079x_dev = container_of(filp->private_data, + struct bcm2079x_dev, + bcm2079x_device); + filp->private_data = bcm2079x_dev; + bcm2079x_init_stat(bcm2079x_dev); + bcm2079x_enable_irq(bcm2079x_dev); + dev_info(&bcm2079x_dev->client->dev, + "device node major=%d, minor=%d\n", imajor(inode), iminor(inode)); + + return ret; +} + +static long bcm2079x_dev_unlocked_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +{ + struct bcm2079x_dev *bcm2079x_dev = filp->private_data; + + switch (cmd) { + case BCMNFC_READ_FULL_PACKET: + break; + case BCMNFC_READ_MULTI_PACKETS: + break; + case BCMNFC_CHANGE_ADDR: + dev_info(&bcm2079x_dev->client->dev, + "%s, BCMNFC_CHANGE_ADDR (%x, %lx):\n", __func__, cmd, + arg); + change_client_addr(bcm2079x_dev, arg); + break; + case BCMNFC_POWER_CTL: + dev_info(&bcm2079x_dev->client->dev, + "%s, BCMNFC_POWER_CTL (%x, %lx):\n", __func__, cmd, + arg); + if (arg == 1) set_client_addr(bcm2079x_dev, bcm2079x_dev->original_address); + gpio_set_value(bcm2079x_dev->en_gpio, arg); + break; + case BCMNFC_WAKE_CTL: + dev_info(&bcm2079x_dev->client->dev, + "%s, BCMNFC_WAKE_CTL (%x, %lx):\n", __func__, cmd, + arg); + gpio_set_value(bcm2079x_dev->wake_gpio, arg); + break; + default: + dev_err(&bcm2079x_dev->client->dev, + "%s, unknown cmd (%x, %lx)\n", __func__, cmd, arg); + return 0; + } + + return 0; +} + +static const struct file_operations bcm2079x_dev_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .poll = bcm2079x_dev_poll, + .read = bcm2079x_dev_read, + .write = bcm2079x_dev_write, + .open = bcm2079x_dev_open, + .unlocked_ioctl = bcm2079x_dev_unlocked_ioctl +}; + +static int bcm2079x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct bcm2079x_platform_data *platform_data; + struct bcm2079x_dev *bcm2079x_dev; + + platform_data = client->dev.platform_data; + + dev_info(&client->dev, "%s, probing bcm2079x driver flags = %x\n", __func__, client->flags); + if (platform_data == NULL) { + dev_err(&client->dev, "nfc probe fail\n"); + return -ENODEV; + } + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "need I2C_FUNC_I2C\n"); + return -ENODEV; + } + + ret = gpio_request(platform_data->irq_gpio, "I2C_REQ"); + if (ret) + return -ENODEV; + ret = gpio_request(platform_data->en_gpio, "REG_PU"); + if (ret) + goto err_en; + ret = gpio_request(platform_data->wake_gpio, "NFC_WAKE"); + if (ret) + goto err_firm; + + bcm2079x_dev = kzalloc(sizeof(*bcm2079x_dev), GFP_KERNEL); + if (bcm2079x_dev == NULL) { + dev_err(&client->dev, + "failed to allocate memory for module data\n"); + ret = -ENOMEM; + goto err_exit; + } + + bcm2079x_dev->wake_gpio = platform_data->wake_gpio; + bcm2079x_dev->irq_gpio = platform_data->irq_gpio; + bcm2079x_dev->en_gpio = platform_data->en_gpio; + bcm2079x_dev->client = client; + + ret = gpio_direction_input(bcm2079x_dev->irq_gpio); + if (ret < 0) { + pr_err("%s : not able to set I2C_REQ as input\n", __func__); + goto err_en; + } + ret = gpio_direction_output(bcm2079x_dev->en_gpio, 0); + if (ret < 0) { + pr_err("%s : not able to set REG_PU as output\n", __func__); + goto err_firm; + } + ret = gpio_direction_output(bcm2079x_dev->wake_gpio, 0); + if (ret < 0) { + pr_err("%s : not able to set NFC_WAKE as output\n", __func__); + goto err_exit; + } + + gpio_set_value(platform_data->en_gpio, 0); + gpio_set_value(platform_data->wake_gpio, 0); + + /* init mutex and queues */ + init_waitqueue_head(&bcm2079x_dev->read_wq); + mutex_init(&bcm2079x_dev->read_mutex); + spin_lock_init(&bcm2079x_dev->irq_enabled_lock); + + bcm2079x_dev->bcm2079x_device.minor = MISC_DYNAMIC_MINOR; + bcm2079x_dev->bcm2079x_device.name = "bcm2079x"; + bcm2079x_dev->bcm2079x_device.fops = &bcm2079x_dev_fops; + + ret = misc_register(&bcm2079x_dev->bcm2079x_device); + if (ret) { + dev_err(&client->dev, "misc_register failed\n"); + goto err_misc_register; + } + dev_info(&client->dev, + "%s, saving address 0x%02x\n", + __func__, client->addr); + bcm2079x_dev->original_address = client->addr; + + /* request irq. the irq is set whenever the chip has data available + * for reading. it is cleared when all data has been read. + */ + dev_info(&client->dev, "requesting IRQ %d with IRQF_NO_SUSPEND\n", client->irq); + bcm2079x_dev->irq_enabled = true; + ret = request_irq(client->irq, bcm2079x_dev_irq_handler, + IRQF_TRIGGER_RISING|IRQF_NO_SUSPEND, client->name, bcm2079x_dev); + if (ret) { + dev_err(&client->dev, "request_irq failed\n"); + goto err_request_irq_failed; + } + bcm2079x_disable_irq(bcm2079x_dev); + i2c_set_clientdata(client, bcm2079x_dev); + dev_info(&client->dev, + "%s, probing bcm2079x driver exited successfully\n", + __func__); + return 0; + +err_request_irq_failed: + misc_deregister(&bcm2079x_dev->bcm2079x_device); +err_misc_register: + mutex_destroy(&bcm2079x_dev->read_mutex); + kfree(bcm2079x_dev); +err_exit: + gpio_free(platform_data->wake_gpio); +err_firm: + gpio_free(platform_data->en_gpio); +err_en: + gpio_free(platform_data->irq_gpio); + return ret; +} + +static int bcm2079x_remove(struct i2c_client *client) +{ + struct bcm2079x_dev *bcm2079x_dev; + + bcm2079x_dev = i2c_get_clientdata(client); + free_irq(client->irq, bcm2079x_dev); + misc_deregister(&bcm2079x_dev->bcm2079x_device); + mutex_destroy(&bcm2079x_dev->read_mutex); + gpio_free(bcm2079x_dev->irq_gpio); + gpio_free(bcm2079x_dev->en_gpio); + gpio_free(bcm2079x_dev->wake_gpio); + kfree(bcm2079x_dev); + + return 0; +} + +static const struct i2c_device_id bcm2079x_id[] = { + {"bcm2079x-i2c", 0}, + {} +}; + +static struct i2c_driver bcm2079x_driver = { + .id_table = bcm2079x_id, + .probe = bcm2079x_probe, + .remove = bcm2079x_remove, + .driver = { + .owner = THIS_MODULE, + .name = "bcm2079x-i2c", + }, +}; + +/* + * module load/unload record keeping + */ + +static int __init bcm2079x_dev_init(void) +{ + return i2c_add_driver(&bcm2079x_driver); +} +module_init(bcm2079x_dev_init); + +static void __exit bcm2079x_dev_exit(void) +{ + i2c_del_driver(&bcm2079x_driver); +} +module_exit(bcm2079x_dev_exit); + +MODULE_AUTHOR("Broadcom"); +MODULE_DESCRIPTION("NFC bcm2079x driver"); +MODULE_LICENSE("GPL"); |