286 строки
6.3 KiB
C
286 строки
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* I2C Link Layer for Samsung S3FWRN5 NCI based Driver
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*
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* Copyright (C) 2015 Samsung Electrnoics
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* Robert Baldyga <r.baldyga@samsung.com>
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*/
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#include <linux/clk.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/module.h>
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#include <net/nfc/nfc.h>
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#include "phy_common.h"
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#define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
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struct s3fwrn5_i2c_phy {
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struct phy_common common;
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struct i2c_client *i2c_dev;
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struct clk *clk;
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unsigned int irq_skip:1;
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};
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static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
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{
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struct s3fwrn5_i2c_phy *phy = phy_id;
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mutex_lock(&phy->common.mutex);
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if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
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goto out;
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phy->irq_skip = true;
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out:
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mutex_unlock(&phy->common.mutex);
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}
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static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
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{
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struct s3fwrn5_i2c_phy *phy = phy_id;
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int ret;
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mutex_lock(&phy->common.mutex);
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phy->irq_skip = false;
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ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
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if (ret == -EREMOTEIO) {
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/* Retry, chip was in standby */
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usleep_range(110000, 120000);
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ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
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}
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mutex_unlock(&phy->common.mutex);
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if (ret < 0)
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return ret;
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if (ret != skb->len)
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return -EREMOTEIO;
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return 0;
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}
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static const struct s3fwrn5_phy_ops i2c_phy_ops = {
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.set_wake = s3fwrn5_phy_set_wake,
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.set_mode = s3fwrn5_i2c_set_mode,
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.get_mode = s3fwrn5_phy_get_mode,
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.write = s3fwrn5_i2c_write,
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};
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static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
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{
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struct sk_buff *skb;
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size_t hdr_size;
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size_t data_len;
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char hdr[4];
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int ret;
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hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
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NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
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ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
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if (ret < 0)
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return ret;
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if (ret < hdr_size)
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return -EBADMSG;
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data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
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((struct nci_ctrl_hdr *)hdr)->plen :
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((struct s3fwrn5_fw_header *)hdr)->len;
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skb = alloc_skb(hdr_size + data_len, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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skb_put_data(skb, hdr, hdr_size);
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if (data_len == 0)
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goto out;
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ret = i2c_master_recv(phy->i2c_dev, skb_put(skb, data_len), data_len);
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if (ret != data_len) {
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kfree_skb(skb);
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return -EBADMSG;
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}
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out:
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return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
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}
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static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
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{
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struct s3fwrn5_i2c_phy *phy = phy_id;
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if (!phy || !phy->common.ndev) {
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WARN_ON_ONCE(1);
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return IRQ_NONE;
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}
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mutex_lock(&phy->common.mutex);
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if (phy->irq_skip)
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goto out;
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switch (phy->common.mode) {
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case S3FWRN5_MODE_NCI:
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case S3FWRN5_MODE_FW:
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s3fwrn5_i2c_read(phy);
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break;
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case S3FWRN5_MODE_COLD:
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break;
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}
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out:
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mutex_unlock(&phy->common.mutex);
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return IRQ_HANDLED;
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}
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static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
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{
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struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
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struct device_node *np = client->dev.of_node;
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if (!np)
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return -ENODEV;
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phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
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if (!gpio_is_valid(phy->common.gpio_en)) {
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/* Support also deprecated property */
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phy->common.gpio_en = of_get_named_gpio(np,
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"s3fwrn5,en-gpios",
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0);
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if (!gpio_is_valid(phy->common.gpio_en))
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return -ENODEV;
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}
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phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
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if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
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/* Support also deprecated property */
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phy->common.gpio_fw_wake = of_get_named_gpio(np,
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"s3fwrn5,fw-gpios",
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0);
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if (!gpio_is_valid(phy->common.gpio_fw_wake))
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return -ENODEV;
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}
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return 0;
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}
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static int s3fwrn5_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 s3fwrn5_i2c_phy *phy;
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int ret;
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phy = devm_kzalloc(&client->dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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mutex_init(&phy->common.mutex);
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phy->common.mode = S3FWRN5_MODE_COLD;
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phy->irq_skip = true;
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phy->i2c_dev = client;
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i2c_set_clientdata(client, phy);
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ret = s3fwrn5_i2c_parse_dt(client);
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if (ret < 0)
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return ret;
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ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
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GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
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if (ret < 0)
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return ret;
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ret = devm_gpio_request_one(&phy->i2c_dev->dev,
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phy->common.gpio_fw_wake,
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GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
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if (ret < 0)
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return ret;
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phy->clk = devm_clk_get_optional(&client->dev, NULL);
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if (IS_ERR(phy->clk))
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return dev_err_probe(&client->dev, PTR_ERR(phy->clk),
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"failed to get clock\n");
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/*
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* S3FWRN5 depends on a clock input ("XI" pin) to function properly.
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* Depending on the hardware configuration this could be an always-on
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* oscillator or some external clock that must be explicitly enabled.
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* Make sure the clock is running before starting S3FWRN5.
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*/
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ret = clk_prepare_enable(phy->clk);
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if (ret < 0) {
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dev_err(&client->dev, "failed to enable clock: %d\n", ret);
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return ret;
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}
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ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev,
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&i2c_phy_ops);
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if (ret < 0)
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goto disable_clk;
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ret = devm_request_threaded_irq(&client->dev, phy->i2c_dev->irq, NULL,
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s3fwrn5_i2c_irq_thread_fn, IRQF_ONESHOT,
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S3FWRN5_I2C_DRIVER_NAME, phy);
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if (ret)
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goto s3fwrn5_remove;
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return 0;
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s3fwrn5_remove:
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s3fwrn5_remove(phy->common.ndev);
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disable_clk:
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clk_disable_unprepare(phy->clk);
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return ret;
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}
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static int s3fwrn5_i2c_remove(struct i2c_client *client)
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{
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struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
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s3fwrn5_remove(phy->common.ndev);
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clk_disable_unprepare(phy->clk);
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return 0;
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}
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static const struct i2c_device_id s3fwrn5_i2c_id_table[] = {
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{S3FWRN5_I2C_DRIVER_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, s3fwrn5_i2c_id_table);
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static const struct of_device_id of_s3fwrn5_i2c_match[] __maybe_unused = {
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{ .compatible = "samsung,s3fwrn5-i2c", },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_s3fwrn5_i2c_match);
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static struct i2c_driver s3fwrn5_i2c_driver = {
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.driver = {
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.name = S3FWRN5_I2C_DRIVER_NAME,
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.of_match_table = of_match_ptr(of_s3fwrn5_i2c_match),
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},
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.probe = s3fwrn5_i2c_probe,
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.remove = s3fwrn5_i2c_remove,
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.id_table = s3fwrn5_i2c_id_table,
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};
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module_i2c_driver(s3fwrn5_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("I2C driver for Samsung S3FWRN5");
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MODULE_AUTHOR("Robert Baldyga <r.baldyga@samsung.com>");
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