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300 lines
6.8 KiB
300 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* I2C Link Layer for ST NCI NFC controller familly based Driver |
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* Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/acpi.h> |
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#include <linux/interrupt.h> |
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#include <linux/delay.h> |
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#include <linux/nfc.h> |
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#include <linux/of.h> |
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#include "st-nci.h" |
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#define DRIVER_DESC "NCI NFC driver for ST_NCI" |
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/* ndlc header */ |
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#define ST_NCI_FRAME_HEADROOM 1 |
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#define ST_NCI_FRAME_TAILROOM 0 |
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#define ST_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */ |
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#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */ |
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#define ST_NCI_DRIVER_NAME "st_nci" |
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#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c" |
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struct st_nci_i2c_phy { |
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struct i2c_client *i2c_dev; |
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struct llt_ndlc *ndlc; |
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bool irq_active; |
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struct gpio_desc *gpiod_reset; |
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struct st_nci_se_status se_status; |
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}; |
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static int st_nci_i2c_enable(void *phy_id) |
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{ |
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struct st_nci_i2c_phy *phy = phy_id; |
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gpiod_set_value(phy->gpiod_reset, 0); |
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usleep_range(10000, 15000); |
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gpiod_set_value(phy->gpiod_reset, 1); |
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usleep_range(80000, 85000); |
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if (phy->ndlc->powered == 0 && phy->irq_active == 0) { |
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enable_irq(phy->i2c_dev->irq); |
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phy->irq_active = true; |
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} |
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return 0; |
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} |
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static void st_nci_i2c_disable(void *phy_id) |
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{ |
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struct st_nci_i2c_phy *phy = phy_id; |
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disable_irq_nosync(phy->i2c_dev->irq); |
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phy->irq_active = false; |
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} |
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/* |
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* Writing a frame must not return the number of written bytes. |
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* It must return either zero for success, or <0 for error. |
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* In addition, it must not alter the skb |
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*/ |
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static int st_nci_i2c_write(void *phy_id, struct sk_buff *skb) |
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{ |
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int r; |
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struct st_nci_i2c_phy *phy = phy_id; |
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struct i2c_client *client = phy->i2c_dev; |
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if (phy->ndlc->hard_fault != 0) |
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return phy->ndlc->hard_fault; |
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r = i2c_master_send(client, skb->data, skb->len); |
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if (r < 0) { /* Retry, chip was in standby */ |
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usleep_range(1000, 4000); |
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r = i2c_master_send(client, skb->data, skb->len); |
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} |
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if (r >= 0) { |
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if (r != skb->len) |
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r = -EREMOTEIO; |
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else |
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r = 0; |
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} |
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return r; |
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} |
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/* |
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* Reads an ndlc frame and returns it in a newly allocated sk_buff. |
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* returns: |
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* 0 : if received frame is complete |
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* -EREMOTEIO : i2c read error (fatal) |
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* -EBADMSG : frame was incorrect and discarded |
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* -ENOMEM : cannot allocate skb, frame dropped |
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*/ |
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static int st_nci_i2c_read(struct st_nci_i2c_phy *phy, |
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struct sk_buff **skb) |
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{ |
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int r; |
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u8 len; |
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u8 buf[ST_NCI_I2C_MAX_SIZE]; |
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struct i2c_client *client = phy->i2c_dev; |
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r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE); |
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if (r < 0) { /* Retry, chip was in standby */ |
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usleep_range(1000, 4000); |
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r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE); |
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} |
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if (r != ST_NCI_I2C_MIN_SIZE) |
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return -EREMOTEIO; |
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len = be16_to_cpu(*(__be16 *) (buf + 2)); |
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if (len > ST_NCI_I2C_MAX_SIZE) { |
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nfc_err(&client->dev, "invalid frame len\n"); |
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return -EBADMSG; |
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} |
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*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL); |
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if (*skb == NULL) |
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return -ENOMEM; |
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skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE); |
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skb_put(*skb, ST_NCI_I2C_MIN_SIZE); |
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memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE); |
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if (!len) |
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return 0; |
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r = i2c_master_recv(client, buf, len); |
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if (r != len) { |
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kfree_skb(*skb); |
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return -EREMOTEIO; |
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} |
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skb_put(*skb, len); |
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memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len); |
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return 0; |
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} |
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/* |
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* Reads an ndlc frame from the chip. |
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* |
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* On ST_NCI, IRQ goes in idle state when read starts. |
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*/ |
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static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id) |
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{ |
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struct st_nci_i2c_phy *phy = phy_id; |
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struct i2c_client *client; |
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struct sk_buff *skb = NULL; |
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int r; |
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if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) { |
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WARN_ON_ONCE(1); |
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return IRQ_NONE; |
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} |
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client = phy->i2c_dev; |
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dev_dbg(&client->dev, "IRQ\n"); |
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if (phy->ndlc->hard_fault) |
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return IRQ_HANDLED; |
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if (!phy->ndlc->powered) { |
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st_nci_i2c_disable(phy); |
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return IRQ_HANDLED; |
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} |
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r = st_nci_i2c_read(phy, &skb); |
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if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG) |
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return IRQ_HANDLED; |
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ndlc_recv(phy->ndlc, skb); |
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return IRQ_HANDLED; |
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} |
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static const struct nfc_phy_ops i2c_phy_ops = { |
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.write = st_nci_i2c_write, |
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.enable = st_nci_i2c_enable, |
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.disable = st_nci_i2c_disable, |
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}; |
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static const struct acpi_gpio_params reset_gpios = { 1, 0, false }; |
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static const struct acpi_gpio_mapping acpi_st_nci_gpios[] = { |
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{ "reset-gpios", &reset_gpios, 1 }, |
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{}, |
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}; |
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static int st_nci_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 device *dev = &client->dev; |
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struct st_nci_i2c_phy *phy; |
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int r; |
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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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phy = devm_kzalloc(dev, sizeof(struct st_nci_i2c_phy), GFP_KERNEL); |
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if (!phy) |
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return -ENOMEM; |
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phy->i2c_dev = client; |
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i2c_set_clientdata(client, phy); |
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r = devm_acpi_dev_add_driver_gpios(dev, acpi_st_nci_gpios); |
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if (r) |
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dev_dbg(dev, "Unable to add GPIO mapping table\n"); |
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/* Get RESET GPIO */ |
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phy->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); |
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if (IS_ERR(phy->gpiod_reset)) { |
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nfc_err(dev, "Unable to get RESET GPIO\n"); |
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return -ENODEV; |
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} |
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phy->se_status.is_ese_present = |
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device_property_read_bool(dev, "ese-present"); |
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phy->se_status.is_uicc_present = |
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device_property_read_bool(dev, "uicc-present"); |
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r = ndlc_probe(phy, &i2c_phy_ops, &client->dev, |
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ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM, |
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&phy->ndlc, &phy->se_status); |
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if (r < 0) { |
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nfc_err(&client->dev, "Unable to register ndlc layer\n"); |
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return r; |
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} |
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phy->irq_active = true; |
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r = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
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st_nci_irq_thread_fn, |
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IRQF_ONESHOT, |
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ST_NCI_DRIVER_NAME, phy); |
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if (r < 0) |
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nfc_err(&client->dev, "Unable to register IRQ handler\n"); |
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return r; |
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} |
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static int st_nci_i2c_remove(struct i2c_client *client) |
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{ |
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struct st_nci_i2c_phy *phy = i2c_get_clientdata(client); |
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ndlc_remove(phy->ndlc); |
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return 0; |
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} |
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static const struct i2c_device_id st_nci_i2c_id_table[] = { |
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{ST_NCI_DRIVER_NAME, 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table); |
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static const struct acpi_device_id st_nci_i2c_acpi_match[] __maybe_unused = { |
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{"SMO2101"}, |
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{"SMO2102"}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(acpi, st_nci_i2c_acpi_match); |
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static const struct of_device_id of_st_nci_i2c_match[] __maybe_unused = { |
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{ .compatible = "st,st21nfcb-i2c", }, |
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{ .compatible = "st,st21nfcb_i2c", }, |
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{ .compatible = "st,st21nfcc-i2c", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match); |
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static struct i2c_driver st_nci_i2c_driver = { |
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.driver = { |
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.name = ST_NCI_I2C_DRIVER_NAME, |
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.of_match_table = of_match_ptr(of_st_nci_i2c_match), |
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.acpi_match_table = ACPI_PTR(st_nci_i2c_acpi_match), |
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}, |
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.probe = st_nci_i2c_probe, |
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.id_table = st_nci_i2c_id_table, |
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.remove = st_nci_i2c_remove, |
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}; |
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module_i2c_driver(st_nci_i2c_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION(DRIVER_DESC);
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