1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * I2C Link Layer for Samsung S3FWRN5 NCI based Driver
9 #include <linux/i2c.h>
18 #include "s3fwrn5.h"
42 	mutex_lock(&phy->mutex);  in s3fwrn5_i2c_set_wake()
43 	gpio_set_value(phy->gpio_fw_wake, wake);  in s3fwrn5_i2c_set_wake()
45 	mutex_unlock(&phy->mutex);  in s3fwrn5_i2c_set_wake()
52 	mutex_lock(&phy->mutex);  in s3fwrn5_i2c_set_mode()
54 	if (phy->mode == mode)  in s3fwrn5_i2c_set_mode()
57 	phy->mode = mode;  in s3fwrn5_i2c_set_mode()
59 	gpio_set_value(phy->gpio_en, 1);  in s3fwrn5_i2c_set_mode()
60 	gpio_set_value(phy->gpio_fw_wake, 0);  in s3fwrn5_i2c_set_mode()
62 		gpio_set_value(phy->gpio_fw_wake, 1);  in s3fwrn5_i2c_set_mode()
66 		gpio_set_value(phy->gpio_en, 0);  in s3fwrn5_i2c_set_mode()
70 	phy->irq_skip = true;  in s3fwrn5_i2c_set_mode()
73 	mutex_unlock(&phy->mutex);  in s3fwrn5_i2c_set_mode()
81 	mutex_lock(&phy->mutex);  in s3fwrn5_i2c_get_mode()
83 	mode = phy->mode;  in s3fwrn5_i2c_get_mode()
85 	mutex_unlock(&phy->mutex);  in s3fwrn5_i2c_get_mode()
95 	mutex_lock(&phy->mutex);  in s3fwrn5_i2c_write()
97 	phy->irq_skip = false;  in s3fwrn5_i2c_write()
99 	ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);  in s3fwrn5_i2c_write()
100 	if (ret == -EREMOTEIO) {  in s3fwrn5_i2c_write()
103 		ret  = i2c_master_send(phy->i2c_dev, skb->data, skb->len);  in s3fwrn5_i2c_write()
106 	mutex_unlock(&phy->mutex);  in s3fwrn5_i2c_write()
111 	if (ret != skb->len)  in s3fwrn5_i2c_write()
112 		return -EREMOTEIO;  in s3fwrn5_i2c_write()
132 	hdr_size = (phy->mode == S3FWRN5_MODE_NCI) ?  in s3fwrn5_i2c_read()
134 	ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);  in s3fwrn5_i2c_read()
139 		return -EBADMSG;  in s3fwrn5_i2c_read()
141 	data_len = (phy->mode == S3FWRN5_MODE_NCI) ?  in s3fwrn5_i2c_read()
142 		((struct nci_ctrl_hdr *)hdr)->plen :  in s3fwrn5_i2c_read()
143 		((struct s3fwrn5_fw_header *)hdr)->len;  in s3fwrn5_i2c_read()
147 		return -ENOMEM;  in s3fwrn5_i2c_read()
154 	ret = i2c_master_recv(phy->i2c_dev, skb_put(skb, data_len), data_len);  in s3fwrn5_i2c_read()
157 		return -EBADMSG;  in s3fwrn5_i2c_read()
161 	return s3fwrn5_recv_frame(phy->ndev, skb, phy->mode);  in s3fwrn5_i2c_read()
168 	if (!phy || !phy->ndev) {  in s3fwrn5_i2c_irq_thread_fn()
173 	mutex_lock(&phy->mutex);  in s3fwrn5_i2c_irq_thread_fn()
175 	if (phy->irq_skip)  in s3fwrn5_i2c_irq_thread_fn()
178 	switch (phy->mode) {  in s3fwrn5_i2c_irq_thread_fn()
188 	mutex_unlock(&phy->mutex);  in s3fwrn5_i2c_irq_thread_fn()
196 	struct device_node *np = client->dev.of_node;  in s3fwrn5_i2c_parse_dt()
199 		return -ENODEV;  in s3fwrn5_i2c_parse_dt()
201 	phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);  in s3fwrn5_i2c_parse_dt()
202 	if (!gpio_is_valid(phy->gpio_en)) {  in s3fwrn5_i2c_parse_dt()
204 		phy->gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);  in s3fwrn5_i2c_parse_dt()
205 		if (!gpio_is_valid(phy->gpio_en))  in s3fwrn5_i2c_parse_dt()
206 			return -ENODEV;  in s3fwrn5_i2c_parse_dt()
209 	phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);  in s3fwrn5_i2c_parse_dt()
210 	if (!gpio_is_valid(phy->gpio_fw_wake)) {  in s3fwrn5_i2c_parse_dt()
212 		phy->gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);  in s3fwrn5_i2c_parse_dt()
213 		if (!gpio_is_valid(phy->gpio_fw_wake))  in s3fwrn5_i2c_parse_dt()
214 			return -ENODEV;  in s3fwrn5_i2c_parse_dt()
226 	phy = devm_kzalloc(&client->dev, sizeof(*phy), GFP_KERNEL);  in s3fwrn5_i2c_probe()
228 		return -ENOMEM;  in s3fwrn5_i2c_probe()
230 	mutex_init(&phy->mutex);  in s3fwrn5_i2c_probe()
231 	phy->mode = S3FWRN5_MODE_COLD;  in s3fwrn5_i2c_probe()
232 	phy->irq_skip = true;  in s3fwrn5_i2c_probe()
234 	phy->i2c_dev = client;  in s3fwrn5_i2c_probe()
241 	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,  in s3fwrn5_i2c_probe()
246 	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw_wake,  in s3fwrn5_i2c_probe()
251 	ret = s3fwrn5_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops,  in s3fwrn5_i2c_probe()
256 	ret = devm_request_threaded_irq(&client->dev, phy->i2c_dev->irq, NULL,  in s3fwrn5_i2c_probe()
260 		s3fwrn5_remove(phy->ndev);  in s3fwrn5_i2c_probe()
269 	s3fwrn5_remove(phy->ndev);  in s3fwrn5_i2c_remove()
278 MODULE_DEVICE_TABLE(i2c, s3fwrn5_i2c_id_table);
281 	{ .compatible = "samsung,s3fwrn5-i2c", },
299 MODULE_DESCRIPTION("I2C driver for Samsung S3FWRN5");