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9#include <linux/i2c.h>
10#include <linux/gpio.h>
11#include <linux/delay.h>
12#include <linux/of_gpio.h>
13#include <linux/of_irq.h>
14#include <linux/module.h>
15
16#include <net/nfc/nfc.h>
17
18#include "phy_common.h"
19
20#define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
21
22struct s3fwrn5_i2c_phy {
23 struct phy_common common;
24 struct i2c_client *i2c_dev;
25
26 unsigned int irq_skip:1;
27};
28
29static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
30{
31 struct s3fwrn5_i2c_phy *phy = phy_id;
32
33 mutex_lock(&phy->common.mutex);
34
35 if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
36 goto out;
37
38 phy->irq_skip = true;
39
40out:
41 mutex_unlock(&phy->common.mutex);
42}
43
44static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
45{
46 struct s3fwrn5_i2c_phy *phy = phy_id;
47 int ret;
48
49 mutex_lock(&phy->common.mutex);
50
51 phy->irq_skip = false;
52
53 ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
54 if (ret == -EREMOTEIO) {
55
56 usleep_range(110000, 120000);
57 ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
58 }
59
60 mutex_unlock(&phy->common.mutex);
61
62 if (ret < 0)
63 return ret;
64
65 if (ret != skb->len)
66 return -EREMOTEIO;
67
68 return 0;
69}
70
71static const struct s3fwrn5_phy_ops i2c_phy_ops = {
72 .set_wake = s3fwrn5_phy_set_wake,
73 .set_mode = s3fwrn5_i2c_set_mode,
74 .get_mode = s3fwrn5_phy_get_mode,
75 .write = s3fwrn5_i2c_write,
76};
77
78static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
79{
80 struct sk_buff *skb;
81 size_t hdr_size;
82 size_t data_len;
83 char hdr[4];
84 int ret;
85
86 hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
87 NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
88 ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
89 if (ret < 0)
90 return ret;
91
92 if (ret < hdr_size)
93 return -EBADMSG;
94
95 data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
96 ((struct nci_ctrl_hdr *)hdr)->plen :
97 ((struct s3fwrn5_fw_header *)hdr)->len;
98
99 skb = alloc_skb(hdr_size + data_len, GFP_KERNEL);
100 if (!skb)
101 return -ENOMEM;
102
103 skb_put_data(skb, hdr, hdr_size);
104
105 if (data_len == 0)
106 goto out;
107
108 ret = i2c_master_recv(phy->i2c_dev, skb_put(skb, data_len), data_len);
109 if (ret != data_len) {
110 kfree_skb(skb);
111 return -EBADMSG;
112 }
113
114out:
115 return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
116}
117
118static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
119{
120 struct s3fwrn5_i2c_phy *phy = phy_id;
121
122 if (!phy || !phy->common.ndev) {
123 WARN_ON_ONCE(1);
124 return IRQ_NONE;
125 }
126
127 mutex_lock(&phy->common.mutex);
128
129 if (phy->irq_skip)
130 goto out;
131
132 switch (phy->common.mode) {
133 case S3FWRN5_MODE_NCI:
134 case S3FWRN5_MODE_FW:
135 s3fwrn5_i2c_read(phy);
136 break;
137 case S3FWRN5_MODE_COLD:
138 break;
139 }
140
141out:
142 mutex_unlock(&phy->common.mutex);
143
144 return IRQ_HANDLED;
145}
146
147static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
148{
149 struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
150 struct device_node *np = client->dev.of_node;
151
152 if (!np)
153 return -ENODEV;
154
155 phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
156 if (!gpio_is_valid(phy->common.gpio_en)) {
157
158 phy->common.gpio_en = of_get_named_gpio(np,
159 "s3fwrn5,en-gpios",
160 0);
161 if (!gpio_is_valid(phy->common.gpio_en))
162 return -ENODEV;
163 }
164
165 phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
166 if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
167
168 phy->common.gpio_fw_wake = of_get_named_gpio(np,
169 "s3fwrn5,fw-gpios",
170 0);
171 if (!gpio_is_valid(phy->common.gpio_fw_wake))
172 return -ENODEV;
173 }
174
175 return 0;
176}
177
178static int s3fwrn5_i2c_probe(struct i2c_client *client,
179 const struct i2c_device_id *id)
180{
181 struct s3fwrn5_i2c_phy *phy;
182 int ret;
183
184 phy = devm_kzalloc(&client->dev, sizeof(*phy), GFP_KERNEL);
185 if (!phy)
186 return -ENOMEM;
187
188 mutex_init(&phy->common.mutex);
189 phy->common.mode = S3FWRN5_MODE_COLD;
190 phy->irq_skip = true;
191
192 phy->i2c_dev = client;
193 i2c_set_clientdata(client, phy);
194
195 ret = s3fwrn5_i2c_parse_dt(client);
196 if (ret < 0)
197 return ret;
198
199 ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
200 GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
201 if (ret < 0)
202 return ret;
203
204 ret = devm_gpio_request_one(&phy->i2c_dev->dev,
205 phy->common.gpio_fw_wake,
206 GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
207 if (ret < 0)
208 return ret;
209
210 ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev,
211 &i2c_phy_ops);
212 if (ret < 0)
213 return ret;
214
215 ret = devm_request_threaded_irq(&client->dev, phy->i2c_dev->irq, NULL,
216 s3fwrn5_i2c_irq_thread_fn, IRQF_ONESHOT,
217 S3FWRN5_I2C_DRIVER_NAME, phy);
218 if (ret)
219 s3fwrn5_remove(phy->common.ndev);
220
221 return ret;
222}
223
224static int s3fwrn5_i2c_remove(struct i2c_client *client)
225{
226 struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
227
228 s3fwrn5_remove(phy->common.ndev);
229
230 return 0;
231}
232
233static const struct i2c_device_id s3fwrn5_i2c_id_table[] = {
234 {S3FWRN5_I2C_DRIVER_NAME, 0},
235 {}
236};
237MODULE_DEVICE_TABLE(i2c, s3fwrn5_i2c_id_table);
238
239static const struct of_device_id of_s3fwrn5_i2c_match[] = {
240 { .compatible = "samsung,s3fwrn5-i2c", },
241 {}
242};
243MODULE_DEVICE_TABLE(of, of_s3fwrn5_i2c_match);
244
245static struct i2c_driver s3fwrn5_i2c_driver = {
246 .driver = {
247 .name = S3FWRN5_I2C_DRIVER_NAME,
248 .of_match_table = of_match_ptr(of_s3fwrn5_i2c_match),
249 },
250 .probe = s3fwrn5_i2c_probe,
251 .remove = s3fwrn5_i2c_remove,
252 .id_table = s3fwrn5_i2c_id_table,
253};
254
255module_i2c_driver(s3fwrn5_i2c_driver);
256
257MODULE_LICENSE("GPL");
258MODULE_DESCRIPTION("I2C driver for Samsung S3FWRN5");
259MODULE_AUTHOR("Robert Baldyga <r.baldyga@samsung.com>");
260
