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9#include <linux/err.h>
10#include <linux/i2c.h>
11#include <linux/interrupt.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/regmap.h>
15#include <linux/slab.h>
16#include <linux/extcon-provider.h>
17#include <linux/gpio/consumer.h>
18
19
20enum ptn5150_reg {
21 PTN5150_REG_DEVICE_ID = 0x01,
22 PTN5150_REG_CONTROL,
23 PTN5150_REG_INT_STATUS,
24 PTN5150_REG_CC_STATUS,
25 PTN5150_REG_CON_DET = 0x09,
26 PTN5150_REG_VCONN_STATUS,
27 PTN5150_REG_RESET,
28 PTN5150_REG_INT_MASK = 0x18,
29 PTN5150_REG_INT_REG_STATUS,
30 PTN5150_REG_END,
31};
32
33#define PTN5150_DFP_ATTACHED 0x1
34#define PTN5150_UFP_ATTACHED 0x2
35
36
37#define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT 0
38#define PTN5150_REG_DEVICE_ID_VENDOR_MASK \
39 (0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)
40
41#define PTN5150_REG_DEVICE_ID_VERSION_SHIFT 3
42#define PTN5150_REG_DEVICE_ID_VERSION_MASK \
43 (0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)
44
45#define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT 2
46#define PTN5150_REG_CC_PORT_ATTACHMENT_MASK \
47 (0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)
48
49#define PTN5150_REG_CC_VBUS_DETECTION_SHIFT 7
50#define PTN5150_REG_CC_VBUS_DETECTION_MASK \
51 (0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)
52
53#define PTN5150_REG_INT_CABLE_ATTACH_SHIFT 0
54#define PTN5150_REG_INT_CABLE_ATTACH_MASK \
55 (0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)
56
57#define PTN5150_REG_INT_CABLE_DETACH_SHIFT 1
58#define PTN5150_REG_INT_CABLE_DETACH_MASK \
59 (0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)
60
61struct ptn5150_info {
62 struct device *dev;
63 struct extcon_dev *edev;
64 struct i2c_client *i2c;
65 struct regmap *regmap;
66 struct gpio_desc *int_gpiod;
67 struct gpio_desc *vbus_gpiod;
68 int irq;
69 struct work_struct irq_work;
70 struct mutex mutex;
71};
72
73
74static const unsigned int ptn5150_extcon_cable[] = {
75 EXTCON_USB,
76 EXTCON_USB_HOST,
77 EXTCON_NONE,
78};
79
80static const struct regmap_config ptn5150_regmap_config = {
81 .reg_bits = 8,
82 .val_bits = 8,
83 .max_register = PTN5150_REG_END,
84};
85
86static void ptn5150_irq_work(struct work_struct *work)
87{
88 struct ptn5150_info *info = container_of(work,
89 struct ptn5150_info, irq_work);
90 int ret = 0;
91 unsigned int reg_data;
92 unsigned int int_status;
93
94 if (!info->edev)
95 return;
96
97 mutex_lock(&info->mutex);
98
99 ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, ®_data);
100 if (ret) {
101 dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
102 mutex_unlock(&info->mutex);
103 return;
104 }
105
106
107 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
108 if (ret) {
109 dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
110 mutex_unlock(&info->mutex);
111 return;
112 }
113
114 if (int_status) {
115 unsigned int cable_attach;
116
117 cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
118 if (cable_attach) {
119 unsigned int port_status;
120 unsigned int vbus;
121
122 port_status = ((reg_data &
123 PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
124 PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);
125
126 switch (port_status) {
127 case PTN5150_DFP_ATTACHED:
128 extcon_set_state_sync(info->edev,
129 EXTCON_USB_HOST, false);
130 gpiod_set_value(info->vbus_gpiod, 0);
131 extcon_set_state_sync(info->edev, EXTCON_USB,
132 true);
133 break;
134 case PTN5150_UFP_ATTACHED:
135 extcon_set_state_sync(info->edev, EXTCON_USB,
136 false);
137 vbus = ((reg_data &
138 PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
139 PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
140 if (vbus)
141 gpiod_set_value(info->vbus_gpiod, 0);
142 else
143 gpiod_set_value(info->vbus_gpiod, 1);
144
145 extcon_set_state_sync(info->edev,
146 EXTCON_USB_HOST, true);
147 break;
148 default:
149 dev_err(info->dev,
150 "Unknown Port status : %x\n",
151 port_status);
152 break;
153 }
154 } else {
155 extcon_set_state_sync(info->edev,
156 EXTCON_USB_HOST, false);
157 extcon_set_state_sync(info->edev,
158 EXTCON_USB, false);
159 gpiod_set_value(info->vbus_gpiod, 0);
160 }
161 }
162
163
164 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
165 &int_status);
166 if (ret) {
167 dev_err(info->dev,
168 "failed to read INT REG STATUS %d\n", ret);
169 mutex_unlock(&info->mutex);
170 return;
171 }
172
173 mutex_unlock(&info->mutex);
174}
175
176
177static irqreturn_t ptn5150_irq_handler(int irq, void *data)
178{
179 struct ptn5150_info *info = data;
180
181 schedule_work(&info->irq_work);
182
183 return IRQ_HANDLED;
184}
185
186static int ptn5150_init_dev_type(struct ptn5150_info *info)
187{
188 unsigned int reg_data, vendor_id, version_id;
189 int ret;
190
191 ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, ®_data);
192 if (ret) {
193 dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
194 return -EINVAL;
195 }
196
197 vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
198 PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
199 version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
200 PTN5150_REG_DEVICE_ID_VERSION_SHIFT);
201
202 dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
203 version_id, vendor_id);
204
205
206 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, ®_data);
207 if (ret) {
208 dev_err(info->dev,
209 "failed to read PTN5150_REG_INT_STATUS %d\n",
210 ret);
211 return -EINVAL;
212 }
213
214 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, ®_data);
215 if (ret) {
216 dev_err(info->dev,
217 "failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
218 return -EINVAL;
219 }
220
221 return 0;
222}
223
224static int ptn5150_i2c_probe(struct i2c_client *i2c,
225 const struct i2c_device_id *id)
226{
227 struct device *dev = &i2c->dev;
228 struct device_node *np = i2c->dev.of_node;
229 struct ptn5150_info *info;
230 int ret;
231
232 if (!np)
233 return -EINVAL;
234
235 info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
236 if (!info)
237 return -ENOMEM;
238 i2c_set_clientdata(i2c, info);
239
240 info->dev = &i2c->dev;
241 info->i2c = i2c;
242 info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
243 if (IS_ERR(info->int_gpiod)) {
244 dev_err(dev, "failed to get INT GPIO\n");
245 return PTR_ERR(info->int_gpiod);
246 }
247 info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
248 if (IS_ERR(info->vbus_gpiod)) {
249 dev_err(dev, "failed to get VBUS GPIO\n");
250 return PTR_ERR(info->vbus_gpiod);
251 }
252 ret = gpiod_direction_output(info->vbus_gpiod, 0);
253 if (ret) {
254 dev_err(dev, "failed to set VBUS GPIO direction\n");
255 return -EINVAL;
256 }
257
258 mutex_init(&info->mutex);
259
260 INIT_WORK(&info->irq_work, ptn5150_irq_work);
261
262 info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
263 if (IS_ERR(info->regmap)) {
264 ret = PTR_ERR(info->regmap);
265 dev_err(info->dev, "failed to allocate register map: %d\n",
266 ret);
267 return ret;
268 }
269
270 if (info->int_gpiod) {
271 info->irq = gpiod_to_irq(info->int_gpiod);
272 if (info->irq < 0) {
273 dev_err(dev, "failed to get INTB IRQ\n");
274 return info->irq;
275 }
276
277 ret = devm_request_threaded_irq(dev, info->irq, NULL,
278 ptn5150_irq_handler,
279 IRQF_TRIGGER_FALLING |
280 IRQF_ONESHOT,
281 i2c->name, info);
282 if (ret < 0) {
283 dev_err(dev, "failed to request handler for INTB IRQ\n");
284 return ret;
285 }
286 }
287
288
289 info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
290 if (IS_ERR(info->edev)) {
291 dev_err(info->dev, "failed to allocate memory for extcon\n");
292 return -ENOMEM;
293 }
294
295
296 ret = devm_extcon_dev_register(info->dev, info->edev);
297 if (ret) {
298 dev_err(info->dev, "failed to register extcon device\n");
299 return ret;
300 }
301
302
303 ret = ptn5150_init_dev_type(info);
304 if (ret)
305 return -EINVAL;
306
307 return 0;
308}
309
310static const struct of_device_id ptn5150_dt_match[] = {
311 { .compatible = "nxp,ptn5150" },
312 { },
313};
314MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
315
316static const struct i2c_device_id ptn5150_i2c_id[] = {
317 { "ptn5150", 0 },
318 { }
319};
320MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
321
322static struct i2c_driver ptn5150_i2c_driver = {
323 .driver = {
324 .name = "ptn5150",
325 .of_match_table = ptn5150_dt_match,
326 },
327 .probe = ptn5150_i2c_probe,
328 .id_table = ptn5150_i2c_id,
329};
330
331static int __init ptn5150_i2c_init(void)
332{
333 return i2c_add_driver(&ptn5150_i2c_driver);
334}
335subsys_initcall(ptn5150_i2c_init);
336
337MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
338MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
339MODULE_LICENSE("GPL v2");
340
