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18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/module.h>
21#include <linux/i2c.h>
22#include <linux/gpio.h>
23#include <linux/gpio/consumer.h>
24#include <linux/of_irq.h>
25#include <linux/of_gpio.h>
26#include <linux/acpi.h>
27#include <linux/interrupt.h>
28#include <linux/delay.h>
29#include <linux/nfc.h>
30#include <linux/platform_data/st-nci.h>
31
32#include "st-nci.h"
33
34#define DRIVER_DESC "NCI NFC driver for ST_NCI"
35
36
37#define ST_NCI_FRAME_HEADROOM 1
38#define ST_NCI_FRAME_TAILROOM 0
39
40#define ST_NCI_I2C_MIN_SIZE 4
41#define ST_NCI_I2C_MAX_SIZE 250
42
43#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"
44
45#define ST_NCI_GPIO_NAME_RESET "reset"
46
47struct st_nci_i2c_phy {
48 struct i2c_client *i2c_dev;
49 struct llt_ndlc *ndlc;
50
51 bool irq_active;
52
53 unsigned int gpio_reset;
54 unsigned int irq_polarity;
55
56 struct st_nci_se_status se_status;
57};
58
59static int st_nci_i2c_enable(void *phy_id)
60{
61 struct st_nci_i2c_phy *phy = phy_id;
62
63 gpio_set_value(phy->gpio_reset, 0);
64 usleep_range(10000, 15000);
65 gpio_set_value(phy->gpio_reset, 1);
66 usleep_range(80000, 85000);
67
68 if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
69 enable_irq(phy->i2c_dev->irq);
70 phy->irq_active = true;
71 }
72
73 return 0;
74}
75
76static void st_nci_i2c_disable(void *phy_id)
77{
78 struct st_nci_i2c_phy *phy = phy_id;
79
80 disable_irq_nosync(phy->i2c_dev->irq);
81 phy->irq_active = false;
82}
83
84
85
86
87
88
89static int st_nci_i2c_write(void *phy_id, struct sk_buff *skb)
90{
91 int r = -1;
92 struct st_nci_i2c_phy *phy = phy_id;
93 struct i2c_client *client = phy->i2c_dev;
94
95 if (phy->ndlc->hard_fault != 0)
96 return phy->ndlc->hard_fault;
97
98 r = i2c_master_send(client, skb->data, skb->len);
99 if (r < 0) {
100 usleep_range(1000, 4000);
101 r = i2c_master_send(client, skb->data, skb->len);
102 }
103
104 if (r >= 0) {
105 if (r != skb->len)
106 r = -EREMOTEIO;
107 else
108 r = 0;
109 }
110
111 return r;
112}
113
114
115
116
117
118
119
120
121
122static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
123 struct sk_buff **skb)
124{
125 int r;
126 u8 len;
127 u8 buf[ST_NCI_I2C_MAX_SIZE];
128 struct i2c_client *client = phy->i2c_dev;
129
130 r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
131 if (r < 0) {
132 usleep_range(1000, 4000);
133 r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
134 }
135
136 if (r != ST_NCI_I2C_MIN_SIZE)
137 return -EREMOTEIO;
138
139 len = be16_to_cpu(*(__be16 *) (buf + 2));
140 if (len > ST_NCI_I2C_MAX_SIZE) {
141 nfc_err(&client->dev, "invalid frame len\n");
142 return -EBADMSG;
143 }
144
145 *skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
146 if (*skb == NULL)
147 return -ENOMEM;
148
149 skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
150 skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
151 memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
152
153 if (!len)
154 return 0;
155
156 r = i2c_master_recv(client, buf, len);
157 if (r != len) {
158 kfree_skb(*skb);
159 return -EREMOTEIO;
160 }
161
162 skb_put(*skb, len);
163 memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
164
165 return 0;
166}
167
168
169
170
171
172
173static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
174{
175 struct st_nci_i2c_phy *phy = phy_id;
176 struct i2c_client *client;
177 struct sk_buff *skb = NULL;
178 int r;
179
180 if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {
181 WARN_ON_ONCE(1);
182 return IRQ_NONE;
183 }
184
185 client = phy->i2c_dev;
186 dev_dbg(&client->dev, "IRQ\n");
187
188 if (phy->ndlc->hard_fault)
189 return IRQ_HANDLED;
190
191 if (!phy->ndlc->powered) {
192 st_nci_i2c_disable(phy);
193 return IRQ_HANDLED;
194 }
195
196 r = st_nci_i2c_read(phy, &skb);
197 if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
198 return IRQ_HANDLED;
199
200 ndlc_recv(phy->ndlc, skb);
201
202 return IRQ_HANDLED;
203}
204
205static struct nfc_phy_ops i2c_phy_ops = {
206 .write = st_nci_i2c_write,
207 .enable = st_nci_i2c_enable,
208 .disable = st_nci_i2c_disable,
209};
210
211static int st_nci_i2c_acpi_request_resources(struct i2c_client *client)
212{
213 struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
214 struct gpio_desc *gpiod_reset;
215 struct device *dev = &client->dev;
216 u8 tmp;
217
218
219 gpiod_reset = devm_gpiod_get_index(dev, ST_NCI_GPIO_NAME_RESET, 1,
220 GPIOD_OUT_HIGH);
221 if (IS_ERR(gpiod_reset)) {
222 nfc_err(dev, "Unable to get RESET GPIO\n");
223 return -ENODEV;
224 }
225
226 phy->gpio_reset = desc_to_gpio(gpiod_reset);
227
228 phy->irq_polarity = irq_get_trigger_type(client->irq);
229
230 phy->se_status.is_ese_present = false;
231 phy->se_status.is_uicc_present = false;
232
233 if (device_property_present(dev, "ese-present")) {
234 device_property_read_u8(dev, "ese-present", &tmp);
235 phy->se_status.is_ese_present = tmp;
236 }
237
238 if (device_property_present(dev, "uicc-present")) {
239 device_property_read_u8(dev, "uicc-present", &tmp);
240 phy->se_status.is_uicc_present = tmp;
241 }
242
243 return 0;
244}
245
246static int st_nci_i2c_of_request_resources(struct i2c_client *client)
247{
248 struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
249 struct device_node *pp;
250 int gpio;
251 int r;
252
253 pp = client->dev.of_node;
254 if (!pp)
255 return -ENODEV;
256
257
258 gpio = of_get_named_gpio(pp, "reset-gpios", 0);
259 if (gpio < 0) {
260 nfc_err(&client->dev,
261 "Failed to retrieve reset-gpios from device tree\n");
262 return gpio;
263 }
264
265
266 r = devm_gpio_request_one(&client->dev, gpio,
267 GPIOF_OUT_INIT_HIGH, ST_NCI_GPIO_NAME_RESET);
268 if (r) {
269 nfc_err(&client->dev, "Failed to request reset pin\n");
270 return r;
271 }
272 phy->gpio_reset = gpio;
273
274 phy->irq_polarity = irq_get_trigger_type(client->irq);
275
276 phy->se_status.is_ese_present =
277 of_property_read_bool(pp, "ese-present");
278 phy->se_status.is_uicc_present =
279 of_property_read_bool(pp, "uicc-present");
280
281 return 0;
282}
283
284static int st_nci_i2c_request_resources(struct i2c_client *client)
285{
286 struct st_nci_nfc_platform_data *pdata;
287 struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
288 int r;
289
290 pdata = client->dev.platform_data;
291 if (pdata == NULL) {
292 nfc_err(&client->dev, "No platform data\n");
293 return -EINVAL;
294 }
295
296
297 phy->gpio_reset = pdata->gpio_reset;
298 phy->irq_polarity = pdata->irq_polarity;
299
300 r = devm_gpio_request_one(&client->dev,
301 phy->gpio_reset, GPIOF_OUT_INIT_HIGH,
302 ST_NCI_GPIO_NAME_RESET);
303 if (r) {
304 pr_err("%s : reset gpio_request failed\n", __FILE__);
305 return r;
306 }
307
308 phy->se_status.is_ese_present = pdata->is_ese_present;
309 phy->se_status.is_uicc_present = pdata->is_uicc_present;
310
311 return 0;
312}
313
314static int st_nci_i2c_probe(struct i2c_client *client,
315 const struct i2c_device_id *id)
316{
317 struct st_nci_i2c_phy *phy;
318 struct st_nci_nfc_platform_data *pdata;
319 int r;
320
321 dev_dbg(&client->dev, "%s\n", __func__);
322 dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
323
324 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
325 nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
326 return -ENODEV;
327 }
328
329 phy = devm_kzalloc(&client->dev, sizeof(struct st_nci_i2c_phy),
330 GFP_KERNEL);
331 if (!phy)
332 return -ENOMEM;
333
334 phy->i2c_dev = client;
335
336 i2c_set_clientdata(client, phy);
337
338 pdata = client->dev.platform_data;
339 if (!pdata && client->dev.of_node) {
340 r = st_nci_i2c_of_request_resources(client);
341 if (r) {
342 nfc_err(&client->dev, "No platform data\n");
343 return r;
344 }
345 } else if (pdata) {
346 r = st_nci_i2c_request_resources(client);
347 if (r) {
348 nfc_err(&client->dev,
349 "Cannot get platform resources\n");
350 return r;
351 }
352 } else if (ACPI_HANDLE(&client->dev)) {
353 r = st_nci_i2c_acpi_request_resources(client);
354 if (r) {
355 nfc_err(&client->dev, "Cannot get ACPI data\n");
356 return r;
357 }
358 } else {
359 nfc_err(&client->dev,
360 "st_nci platform resources not available\n");
361 return -ENODEV;
362 }
363
364 r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
365 ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
366 &phy->ndlc, &phy->se_status);
367 if (r < 0) {
368 nfc_err(&client->dev, "Unable to register ndlc layer\n");
369 return r;
370 }
371
372 phy->irq_active = true;
373 r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
374 st_nci_irq_thread_fn,
375 phy->irq_polarity | IRQF_ONESHOT,
376 ST_NCI_DRIVER_NAME, phy);
377 if (r < 0)
378 nfc_err(&client->dev, "Unable to register IRQ handler\n");
379
380 return r;
381}
382
383static int st_nci_i2c_remove(struct i2c_client *client)
384{
385 struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
386
387 dev_dbg(&client->dev, "%s\n", __func__);
388
389 ndlc_remove(phy->ndlc);
390
391 return 0;
392}
393
394static struct i2c_device_id st_nci_i2c_id_table[] = {
395 {ST_NCI_DRIVER_NAME, 0},
396 {}
397};
398MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);
399
400static const struct acpi_device_id st_nci_i2c_acpi_match[] = {
401 {"SMO2101"},
402 {"SMO2102"},
403 {}
404};
405MODULE_DEVICE_TABLE(acpi, st_nci_i2c_acpi_match);
406
407static const struct of_device_id of_st_nci_i2c_match[] = {
408 { .compatible = "st,st21nfcb-i2c", },
409 { .compatible = "st,st21nfcb_i2c", },
410 { .compatible = "st,st21nfcc-i2c", },
411 {}
412};
413MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
414
415static struct i2c_driver st_nci_i2c_driver = {
416 .driver = {
417 .name = ST_NCI_I2C_DRIVER_NAME,
418 .of_match_table = of_match_ptr(of_st_nci_i2c_match),
419 .acpi_match_table = ACPI_PTR(st_nci_i2c_acpi_match),
420 },
421 .probe = st_nci_i2c_probe,
422 .id_table = st_nci_i2c_id_table,
423 .remove = st_nci_i2c_remove,
424};
425module_i2c_driver(st_nci_i2c_driver);
426
427MODULE_LICENSE("GPL");
428MODULE_DESCRIPTION(DRIVER_DESC);
429
