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289 lines
6.9 KiB
289 lines
6.9 KiB
/** |
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* Marvell NFC-over-I2C driver: I2C interface related functions |
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* |
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* Copyright (C) 2015, Marvell International Ltd. |
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* |
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* This software file (the "File") is distributed by Marvell International |
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* Ltd. under the terms of the GNU General Public License Version 2, June 1991 |
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* (the "License"). You may use, redistribute and/or modify this File in |
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* accordance with the terms and conditions of the License, a copy of which |
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* is available on the worldwide web at |
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. |
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* |
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE |
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about |
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* this warranty disclaimer. |
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**/ |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/i2c.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/nfc.h> |
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#include <linux/gpio.h> |
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#include <linux/delay.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_gpio.h> |
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#include <net/nfc/nci.h> |
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#include <net/nfc/nci_core.h> |
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#include "nfcmrvl.h" |
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struct nfcmrvl_i2c_drv_data { |
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unsigned long flags; |
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struct device *dev; |
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struct i2c_client *i2c; |
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struct nfcmrvl_private *priv; |
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}; |
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static int nfcmrvl_i2c_read(struct nfcmrvl_i2c_drv_data *drv_data, |
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struct sk_buff **skb) |
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{ |
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int ret; |
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struct nci_ctrl_hdr nci_hdr; |
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/* Read NCI header to know the payload size */ |
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ret = i2c_master_recv(drv_data->i2c, (u8 *)&nci_hdr, NCI_CTRL_HDR_SIZE); |
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if (ret != NCI_CTRL_HDR_SIZE) { |
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nfc_err(&drv_data->i2c->dev, "cannot read NCI header\n"); |
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return -EBADMSG; |
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} |
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if (nci_hdr.plen > NCI_MAX_PAYLOAD_SIZE) { |
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nfc_err(&drv_data->i2c->dev, "invalid packet payload size\n"); |
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return -EBADMSG; |
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} |
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*skb = nci_skb_alloc(drv_data->priv->ndev, |
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nci_hdr.plen + NCI_CTRL_HDR_SIZE, GFP_KERNEL); |
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if (!*skb) |
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return -ENOMEM; |
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/* Copy NCI header into the SKB */ |
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skb_put_data(*skb, &nci_hdr, NCI_CTRL_HDR_SIZE); |
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if (nci_hdr.plen) { |
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/* Read the NCI payload */ |
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ret = i2c_master_recv(drv_data->i2c, |
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skb_put(*skb, nci_hdr.plen), |
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nci_hdr.plen); |
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if (ret != nci_hdr.plen) { |
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nfc_err(&drv_data->i2c->dev, |
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"Invalid frame payload length: %u (expected %u)\n", |
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ret, nci_hdr.plen); |
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kfree_skb(*skb); |
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return -EBADMSG; |
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} |
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} |
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return 0; |
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} |
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static irqreturn_t nfcmrvl_i2c_int_irq_thread_fn(int irq, void *drv_data_ptr) |
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{ |
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struct nfcmrvl_i2c_drv_data *drv_data = drv_data_ptr; |
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struct sk_buff *skb = NULL; |
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int ret; |
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if (!drv_data->priv) |
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return IRQ_HANDLED; |
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if (test_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags)) |
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return IRQ_HANDLED; |
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ret = nfcmrvl_i2c_read(drv_data, &skb); |
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switch (ret) { |
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case -EREMOTEIO: |
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set_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags); |
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break; |
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case -ENOMEM: |
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case -EBADMSG: |
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nfc_err(&drv_data->i2c->dev, "read failed %d\n", ret); |
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break; |
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default: |
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if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0) |
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nfc_err(&drv_data->i2c->dev, "corrupted RX packet\n"); |
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break; |
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} |
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return IRQ_HANDLED; |
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} |
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static int nfcmrvl_i2c_nci_open(struct nfcmrvl_private *priv) |
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{ |
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struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data; |
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if (!drv_data) |
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return -ENODEV; |
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return 0; |
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} |
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static int nfcmrvl_i2c_nci_close(struct nfcmrvl_private *priv) |
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{ |
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return 0; |
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} |
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static int nfcmrvl_i2c_nci_send(struct nfcmrvl_private *priv, |
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struct sk_buff *skb) |
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{ |
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struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data; |
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int ret; |
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if (test_bit(NFCMRVL_PHY_ERROR, &priv->flags)) |
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return -EREMOTEIO; |
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ret = i2c_master_send(drv_data->i2c, skb->data, skb->len); |
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/* Retry if chip was in standby */ |
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if (ret == -EREMOTEIO) { |
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nfc_info(drv_data->dev, "chip may sleep, retry\n"); |
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usleep_range(6000, 10000); |
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ret = i2c_master_send(drv_data->i2c, skb->data, skb->len); |
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} |
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if (ret >= 0) { |
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if (ret != skb->len) { |
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nfc_err(drv_data->dev, |
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"Invalid length sent: %u (expected %u)\n", |
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ret, skb->len); |
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ret = -EREMOTEIO; |
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} else |
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ret = 0; |
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kfree_skb(skb); |
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} |
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return ret; |
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} |
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static void nfcmrvl_i2c_nci_update_config(struct nfcmrvl_private *priv, |
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const void *param) |
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{ |
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} |
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static struct nfcmrvl_if_ops i2c_ops = { |
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.nci_open = nfcmrvl_i2c_nci_open, |
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.nci_close = nfcmrvl_i2c_nci_close, |
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.nci_send = nfcmrvl_i2c_nci_send, |
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.nci_update_config = nfcmrvl_i2c_nci_update_config, |
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}; |
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static int nfcmrvl_i2c_parse_dt(struct device_node *node, |
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struct nfcmrvl_platform_data *pdata) |
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{ |
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int ret; |
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ret = nfcmrvl_parse_dt(node, pdata); |
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if (ret < 0) { |
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pr_err("Failed to get generic entries\n"); |
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return ret; |
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} |
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if (of_find_property(node, "i2c-int-falling", NULL)) |
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pdata->irq_polarity = IRQF_TRIGGER_FALLING; |
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else |
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pdata->irq_polarity = IRQF_TRIGGER_RISING; |
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ret = irq_of_parse_and_map(node, 0); |
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if (ret < 0) { |
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pr_err("Unable to get irq, error: %d\n", ret); |
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return ret; |
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} |
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pdata->irq = ret; |
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return 0; |
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} |
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static int nfcmrvl_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct nfcmrvl_i2c_drv_data *drv_data; |
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struct nfcmrvl_platform_data *pdata; |
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struct nfcmrvl_platform_data config; |
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int ret; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); |
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return -ENODEV; |
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} |
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drv_data = devm_kzalloc(&client->dev, sizeof(*drv_data), GFP_KERNEL); |
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if (!drv_data) |
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return -ENOMEM; |
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drv_data->i2c = client; |
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drv_data->dev = &client->dev; |
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drv_data->priv = NULL; |
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i2c_set_clientdata(client, drv_data); |
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pdata = client->dev.platform_data; |
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if (!pdata && client->dev.of_node) |
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if (nfcmrvl_i2c_parse_dt(client->dev.of_node, &config) == 0) |
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pdata = &config; |
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if (!pdata) |
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return -EINVAL; |
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/* Request the read IRQ */ |
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ret = devm_request_threaded_irq(&drv_data->i2c->dev, pdata->irq, |
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NULL, nfcmrvl_i2c_int_irq_thread_fn, |
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pdata->irq_polarity | IRQF_ONESHOT, |
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"nfcmrvl_i2c_int", drv_data); |
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if (ret < 0) { |
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nfc_err(&drv_data->i2c->dev, |
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"Unable to register IRQ handler\n"); |
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return ret; |
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} |
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drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_I2C, |
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drv_data, &i2c_ops, |
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&drv_data->i2c->dev, pdata); |
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if (IS_ERR(drv_data->priv)) |
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return PTR_ERR(drv_data->priv); |
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drv_data->priv->support_fw_dnld = true; |
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return 0; |
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} |
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static int nfcmrvl_i2c_remove(struct i2c_client *client) |
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{ |
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struct nfcmrvl_i2c_drv_data *drv_data = i2c_get_clientdata(client); |
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nfcmrvl_nci_unregister_dev(drv_data->priv); |
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return 0; |
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} |
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static const struct of_device_id of_nfcmrvl_i2c_match[] = { |
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{ .compatible = "marvell,nfc-i2c", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, of_nfcmrvl_i2c_match); |
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static const struct i2c_device_id nfcmrvl_i2c_id_table[] = { |
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{ "nfcmrvl_i2c", 0 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, nfcmrvl_i2c_id_table); |
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static struct i2c_driver nfcmrvl_i2c_driver = { |
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.probe = nfcmrvl_i2c_probe, |
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.id_table = nfcmrvl_i2c_id_table, |
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.remove = nfcmrvl_i2c_remove, |
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.driver = { |
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.name = "nfcmrvl_i2c", |
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.of_match_table = of_match_ptr(of_nfcmrvl_i2c_match), |
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}, |
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}; |
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module_i2c_driver(nfcmrvl_i2c_driver); |
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MODULE_AUTHOR("Marvell International Ltd."); |
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MODULE_DESCRIPTION("Marvell NFC-over-I2C driver"); |
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MODULE_LICENSE("GPL v2");
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