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path: root/drivers/nfc/st21nfcb/i2c.c
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Diffstat (limited to 'drivers/nfc/st21nfcb/i2c.c')
-rw-r--r--drivers/nfc/st21nfcb/i2c.c388
1 files changed, 0 insertions, 388 deletions
diff --git a/drivers/nfc/st21nfcb/i2c.c b/drivers/nfc/st21nfcb/i2c.c
deleted file mode 100644
index c44f8cf53..000000000
--- a/drivers/nfc/st21nfcb/i2c.c
+++ /dev/null
@@ -1,388 +0,0 @@
-/*
- * I2C Link Layer for ST21NFCB NCI 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/module.h>
-#include <linux/i2c.h>
-#include <linux/gpio.h>
-#include <linux/of_irq.h>
-#include <linux/of_gpio.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/nfc.h>
-#include <linux/platform_data/st21nfcb.h>
-
-#include "ndlc.h"
-
-#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
-
-/* ndlc header */
-#define ST21NFCB_FRAME_HEADROOM 1
-#define ST21NFCB_FRAME_TAILROOM 0
-
-#define ST21NFCB_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
-#define ST21NFCB_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
-
-#define ST21NFCB_NCI_I2C_DRIVER_NAME "st21nfcb_nci_i2c"
-
-static struct i2c_device_id st21nfcb_nci_i2c_id_table[] = {
- {ST21NFCB_NCI_DRIVER_NAME, 0},
- {}
-};
-MODULE_DEVICE_TABLE(i2c, st21nfcb_nci_i2c_id_table);
-
-struct st21nfcb_i2c_phy {
- struct i2c_client *i2c_dev;
- struct llt_ndlc *ndlc;
-
- unsigned int gpio_reset;
- unsigned int irq_polarity;
-
- int powered;
-};
-
-#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 int st21nfcb_nci_i2c_enable(void *phy_id)
-{
- struct st21nfcb_i2c_phy *phy = phy_id;
-
- gpio_set_value(phy->gpio_reset, 0);
- usleep_range(10000, 15000);
- gpio_set_value(phy->gpio_reset, 1);
- phy->powered = 1;
- usleep_range(80000, 85000);
-
- return 0;
-}
-
-static void st21nfcb_nci_i2c_disable(void *phy_id)
-{
- struct st21nfcb_i2c_phy *phy = phy_id;
-
- phy->powered = 0;
- /* reset chip in order to flush clf */
- gpio_set_value(phy->gpio_reset, 0);
- usleep_range(10000, 15000);
- gpio_set_value(phy->gpio_reset, 1);
-}
-
-/*
- * 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 st21nfcb_nci_i2c_write(void *phy_id, struct sk_buff *skb)
-{
- int r = -1;
- struct st21nfcb_i2c_phy *phy = phy_id;
- struct i2c_client *client = phy->i2c_dev;
-
- I2C_DUMP_SKB("st21nfcb_nci_i2c_write", skb);
-
- if (phy->ndlc->hard_fault != 0)
- return phy->ndlc->hard_fault;
-
- r = i2c_master_send(client, skb->data, skb->len);
- if (r < 0) { /* Retry, chip was in standby */
- usleep_range(1000, 4000);
- r = i2c_master_send(client, skb->data, skb->len);
- }
-
- if (r >= 0) {
- if (r != skb->len)
- r = -EREMOTEIO;
- else
- r = 0;
- }
-
- return r;
-}
-
-/*
- * Reads an ndlc frame and returns it in a newly allocated sk_buff.
- * returns:
- * frame size : if received frame is complete (find ST21NFCB_SOF_EOF at
- * end of read)
- * -EAGAIN : if received frame is incomplete (not find ST21NFCB_SOF_EOF
- * at end of read)
- * -EREMOTEIO : i2c read error (fatal)
- * -EBADMSG : frame was incorrect and discarded
- * (value returned from st21nfcb_nci_i2c_repack)
- * -EIO : if no ST21NFCB_SOF_EOF is found after reaching
- * the read length end sequence
- */
-static int st21nfcb_nci_i2c_read(struct st21nfcb_i2c_phy *phy,
- struct sk_buff **skb)
-{
- int r;
- u8 len;
- u8 buf[ST21NFCB_NCI_I2C_MAX_SIZE];
- struct i2c_client *client = phy->i2c_dev;
-
- r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE);
- if (r < 0) { /* Retry, chip was in standby */
- usleep_range(1000, 4000);
- r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE);
- }
-
- if (r != ST21NFCB_NCI_I2C_MIN_SIZE)
- return -EREMOTEIO;
-
- len = be16_to_cpu(*(__be16 *) (buf + 2));
- if (len > ST21NFCB_NCI_I2C_MAX_SIZE) {
- nfc_err(&client->dev, "invalid frame len\n");
- return -EBADMSG;
- }
-
- *skb = alloc_skb(ST21NFCB_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
- if (*skb == NULL)
- return -ENOMEM;
-
- skb_reserve(*skb, ST21NFCB_NCI_I2C_MIN_SIZE);
- skb_put(*skb, ST21NFCB_NCI_I2C_MIN_SIZE);
- memcpy((*skb)->data, buf, ST21NFCB_NCI_I2C_MIN_SIZE);
-
- if (!len)
- return 0;
-
- r = i2c_master_recv(client, buf, len);
- if (r != len) {
- kfree_skb(*skb);
- return -EREMOTEIO;
- }
-
- skb_put(*skb, len);
- memcpy((*skb)->data + ST21NFCB_NCI_I2C_MIN_SIZE, buf, len);
-
- I2C_DUMP_SKB("i2c frame read", *skb);
-
- return 0;
-}
-
-/*
- * Reads an ndlc frame from the chip.
- *
- * On ST21NFCB, IRQ goes in idle state when read starts.
- */
-static irqreturn_t st21nfcb_nci_irq_thread_fn(int irq, void *phy_id)
-{
- struct st21nfcb_i2c_phy *phy = phy_id;
- struct i2c_client *client;
- struct sk_buff *skb = NULL;
- int r;
-
- if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {
- WARN_ON_ONCE(1);
- return IRQ_NONE;
- }
-
- client = phy->i2c_dev;
- dev_dbg(&client->dev, "IRQ\n");
-
- if (phy->ndlc->hard_fault)
- return IRQ_HANDLED;
-
- if (!phy->powered) {
- st21nfcb_nci_i2c_disable(phy);
- return IRQ_HANDLED;
- }
-
- r = st21nfcb_nci_i2c_read(phy, &skb);
- if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
- return IRQ_HANDLED;
-
- ndlc_recv(phy->ndlc, skb);
-
- return IRQ_HANDLED;
-}
-
-static struct nfc_phy_ops i2c_phy_ops = {
- .write = st21nfcb_nci_i2c_write,
- .enable = st21nfcb_nci_i2c_enable,
- .disable = st21nfcb_nci_i2c_disable,
-};
-
-#ifdef CONFIG_OF
-static int st21nfcb_nci_i2c_of_request_resources(struct i2c_client *client)
-{
- struct st21nfcb_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, "reset-gpios", 0);
- if (gpio < 0) {
- nfc_err(&client->dev,
- "Failed to retrieve reset-gpios from device tree\n");
- return gpio;
- }
-
- /* GPIO request and configuration */
- r = devm_gpio_request_one(&client->dev, gpio,
- GPIOF_OUT_INIT_HIGH, "clf_reset");
- if (r) {
- nfc_err(&client->dev, "Failed to request reset pin\n");
- return r;
- }
- phy->gpio_reset = gpio;
-
- phy->irq_polarity = irq_get_trigger_type(client->irq);
-
- return 0;
-}
-#else
-static int st21nfcb_nci_i2c_of_request_resources(struct i2c_client *client)
-{
- return -ENODEV;
-}
-#endif
-
-static int st21nfcb_nci_i2c_request_resources(struct i2c_client *client)
-{
- struct st21nfcb_nfc_platform_data *pdata;
- struct st21nfcb_i2c_phy *phy = i2c_get_clientdata(client);
- int r;
-
- pdata = client->dev.platform_data;
- if (pdata == NULL) {
- nfc_err(&client->dev, "No platform data\n");
- return -EINVAL;
- }
-
- /* store for later use */
- phy->gpio_reset = pdata->gpio_reset;
- phy->irq_polarity = pdata->irq_polarity;
-
- r = devm_gpio_request_one(&client->dev,
- phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
- if (r) {
- pr_err("%s : reset gpio_request failed\n", __FILE__);
- return r;
- }
-
- return 0;
-}
-
-static int st21nfcb_nci_i2c_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct st21nfcb_i2c_phy *phy;
- struct st21nfcb_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 st21nfcb_i2c_phy),
- GFP_KERNEL);
- if (!phy)
- return -ENOMEM;
-
- phy->i2c_dev = client;
-
- i2c_set_clientdata(client, phy);
-
- pdata = client->dev.platform_data;
- if (!pdata && client->dev.of_node) {
- r = st21nfcb_nci_i2c_of_request_resources(client);
- if (r) {
- nfc_err(&client->dev, "No platform data\n");
- return r;
- }
- } else if (pdata) {
- r = st21nfcb_nci_i2c_request_resources(client);
- if (r) {
- nfc_err(&client->dev,
- "Cannot get platform resources\n");
- return r;
- }
- } else {
- nfc_err(&client->dev,
- "st21nfcb platform resources not available\n");
- return -ENODEV;
- }
-
- r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
- ST21NFCB_FRAME_HEADROOM, ST21NFCB_FRAME_TAILROOM,
- &phy->ndlc);
- if (r < 0) {
- nfc_err(&client->dev, "Unable to register ndlc layer\n");
- return r;
- }
-
- r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
- st21nfcb_nci_irq_thread_fn,
- phy->irq_polarity | IRQF_ONESHOT,
- ST21NFCB_NCI_DRIVER_NAME, phy);
- if (r < 0)
- nfc_err(&client->dev, "Unable to register IRQ handler\n");
-
- return r;
-}
-
-static int st21nfcb_nci_i2c_remove(struct i2c_client *client)
-{
- struct st21nfcb_i2c_phy *phy = i2c_get_clientdata(client);
-
- dev_dbg(&client->dev, "%s\n", __func__);
-
- ndlc_remove(phy->ndlc);
-
- return 0;
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id of_st21nfcb_i2c_match[] = {
- { .compatible = "st,st21nfcb-i2c", },
- { .compatible = "st,st21nfcb_i2c", },
- {}
-};
-MODULE_DEVICE_TABLE(of, of_st21nfcb_i2c_match);
-#endif
-
-static struct i2c_driver st21nfcb_nci_i2c_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = ST21NFCB_NCI_I2C_DRIVER_NAME,
- .of_match_table = of_match_ptr(of_st21nfcb_i2c_match),
- },
- .probe = st21nfcb_nci_i2c_probe,
- .id_table = st21nfcb_nci_i2c_id_table,
- .remove = st21nfcb_nci_i2c_remove,
-};
-
-module_i2c_driver(st21nfcb_nci_i2c_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION(DRIVER_DESC);
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