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10#include <linux/bitfield.h>
11#include <linux/err.h>
12#include <linux/i2c.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/regmap.h>
17#include <linux/slab.h>
18#include <linux/extcon-provider.h>
19#include <linux/gpio/consumer.h>
20
21
22#define PTN5150_REG_DEVICE_ID 0x01
23#define PTN5150_REG_CONTROL 0x02
24#define PTN5150_REG_INT_STATUS 0x03
25#define PTN5150_REG_CC_STATUS 0x04
26#define PTN5150_REG_CON_DET 0x09
27#define PTN5150_REG_VCONN_STATUS 0x0a
28#define PTN5150_REG_RESET 0x0b
29#define PTN5150_REG_INT_MASK 0x18
30#define PTN5150_REG_INT_REG_STATUS 0x19
31#define PTN5150_REG_END PTN5150_REG_INT_REG_STATUS
32
33#define PTN5150_DFP_ATTACHED 0x1
34#define PTN5150_UFP_ATTACHED 0x2
35
36
37#define PTN5150_REG_DEVICE_ID_VERSION GENMASK(7, 3)
38#define PTN5150_REG_DEVICE_ID_VENDOR GENMASK(2, 0)
39
40#define PTN5150_REG_CC_PORT_ATTACHMENT GENMASK(4, 2)
41#define PTN5150_REG_CC_VBUS_DETECTION BIT(7)
42#define PTN5150_REG_INT_CABLE_ATTACH_MASK BIT(0)
43#define PTN5150_REG_INT_CABLE_DETACH_MASK BIT(1)
44
45struct ptn5150_info {
46 struct device *dev;
47 struct extcon_dev *edev;
48 struct i2c_client *i2c;
49 struct regmap *regmap;
50 struct gpio_desc *int_gpiod;
51 struct gpio_desc *vbus_gpiod;
52 int irq;
53 struct work_struct irq_work;
54 struct mutex mutex;
55};
56
57
58static const unsigned int ptn5150_extcon_cable[] = {
59 EXTCON_USB,
60 EXTCON_USB_HOST,
61 EXTCON_NONE,
62};
63
64static const struct regmap_config ptn5150_regmap_config = {
65 .reg_bits = 8,
66 .val_bits = 8,
67 .max_register = PTN5150_REG_END,
68};
69
70static void ptn5150_check_state(struct ptn5150_info *info)
71{
72 unsigned int port_status, reg_data, vbus;
73 int ret;
74
75 ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, ®_data);
76 if (ret) {
77 dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
78 return;
79 }
80
81 port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data);
82
83 switch (port_status) {
84 case PTN5150_DFP_ATTACHED:
85 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
86 gpiod_set_value_cansleep(info->vbus_gpiod, 0);
87 extcon_set_state_sync(info->edev, EXTCON_USB, true);
88 break;
89 case PTN5150_UFP_ATTACHED:
90 extcon_set_state_sync(info->edev, EXTCON_USB, false);
91 vbus = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data);
92 if (vbus)
93 gpiod_set_value_cansleep(info->vbus_gpiod, 0);
94 else
95 gpiod_set_value_cansleep(info->vbus_gpiod, 1);
96
97 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
98 break;
99 default:
100 break;
101 }
102}
103
104static void ptn5150_irq_work(struct work_struct *work)
105{
106 struct ptn5150_info *info = container_of(work,
107 struct ptn5150_info, irq_work);
108 int ret = 0;
109 unsigned int int_status;
110
111 if (!info->edev)
112 return;
113
114 mutex_lock(&info->mutex);
115
116
117 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
118 if (ret) {
119 dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
120 mutex_unlock(&info->mutex);
121 return;
122 }
123
124 if (int_status) {
125 unsigned int cable_attach;
126
127 cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
128 if (cable_attach) {
129 ptn5150_check_state(info);
130 } else {
131 extcon_set_state_sync(info->edev,
132 EXTCON_USB_HOST, false);
133 extcon_set_state_sync(info->edev,
134 EXTCON_USB, false);
135 gpiod_set_value_cansleep(info->vbus_gpiod, 0);
136 }
137 }
138
139
140 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
141 &int_status);
142 if (ret) {
143 dev_err(info->dev,
144 "failed to read INT REG STATUS %d\n", ret);
145 mutex_unlock(&info->mutex);
146 return;
147 }
148
149 mutex_unlock(&info->mutex);
150}
151
152
153static irqreturn_t ptn5150_irq_handler(int irq, void *data)
154{
155 struct ptn5150_info *info = data;
156
157 schedule_work(&info->irq_work);
158
159 return IRQ_HANDLED;
160}
161
162static int ptn5150_init_dev_type(struct ptn5150_info *info)
163{
164 unsigned int reg_data, vendor_id, version_id;
165 int ret;
166
167 ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, ®_data);
168 if (ret) {
169 dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
170 return -EINVAL;
171 }
172
173 vendor_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data);
174 version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data);
175 dev_dbg(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
176 version_id, vendor_id);
177
178
179 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, ®_data);
180 if (ret) {
181 dev_err(info->dev,
182 "failed to read PTN5150_REG_INT_STATUS %d\n",
183 ret);
184 return -EINVAL;
185 }
186
187 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, ®_data);
188 if (ret) {
189 dev_err(info->dev,
190 "failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
191 return -EINVAL;
192 }
193
194 return 0;
195}
196
197static int ptn5150_i2c_probe(struct i2c_client *i2c)
198{
199 struct device *dev = &i2c->dev;
200 struct device_node *np = i2c->dev.of_node;
201 struct ptn5150_info *info;
202 int ret;
203
204 if (!np)
205 return -EINVAL;
206
207 info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
208 if (!info)
209 return -ENOMEM;
210 i2c_set_clientdata(i2c, info);
211
212 info->dev = &i2c->dev;
213 info->i2c = i2c;
214 info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW);
215 if (IS_ERR(info->vbus_gpiod)) {
216 ret = PTR_ERR(info->vbus_gpiod);
217 if (ret == -ENOENT) {
218 dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n");
219 info->vbus_gpiod = NULL;
220 } else {
221 return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n");
222 }
223 }
224
225 mutex_init(&info->mutex);
226
227 INIT_WORK(&info->irq_work, ptn5150_irq_work);
228
229 info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
230 if (IS_ERR(info->regmap)) {
231 return dev_err_probe(info->dev, PTR_ERR(info->regmap),
232 "failed to allocate register map\n");
233 }
234
235 if (i2c->irq > 0) {
236 info->irq = i2c->irq;
237 } else {
238 info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
239 if (IS_ERR(info->int_gpiod)) {
240 return dev_err_probe(dev, PTR_ERR(info->int_gpiod),
241 "failed to get INT GPIO\n");
242 }
243
244 info->irq = gpiod_to_irq(info->int_gpiod);
245 if (info->irq < 0) {
246 dev_err(dev, "failed to get INTB IRQ\n");
247 return info->irq;
248 }
249 }
250
251 ret = devm_request_threaded_irq(dev, info->irq, NULL,
252 ptn5150_irq_handler,
253 IRQF_TRIGGER_FALLING |
254 IRQF_ONESHOT,
255 i2c->name, info);
256 if (ret < 0) {
257 dev_err(dev, "failed to request handler for INTB IRQ\n");
258 return ret;
259 }
260
261
262 info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
263 if (IS_ERR(info->edev)) {
264 dev_err(info->dev, "failed to allocate memory for extcon\n");
265 return -ENOMEM;
266 }
267
268
269 ret = devm_extcon_dev_register(info->dev, info->edev);
270 if (ret) {
271 dev_err(info->dev, "failed to register extcon device\n");
272 return ret;
273 }
274
275 extcon_set_property_capability(info->edev, EXTCON_USB,
276 EXTCON_PROP_USB_VBUS);
277 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
278 EXTCON_PROP_USB_VBUS);
279 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
280 EXTCON_PROP_USB_TYPEC_POLARITY);
281
282
283 ret = ptn5150_init_dev_type(info);
284 if (ret)
285 return -EINVAL;
286
287
288
289
290
291 mutex_lock(&info->mutex);
292 ptn5150_check_state(info);
293 mutex_unlock(&info->mutex);
294
295 return 0;
296}
297
298static const struct of_device_id ptn5150_dt_match[] = {
299 { .compatible = "nxp,ptn5150" },
300 { },
301};
302MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
303
304static const struct i2c_device_id ptn5150_i2c_id[] = {
305 { "ptn5150", 0 },
306 { }
307};
308MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
309
310static struct i2c_driver ptn5150_i2c_driver = {
311 .driver = {
312 .name = "ptn5150",
313 .of_match_table = ptn5150_dt_match,
314 },
315 .probe_new = ptn5150_i2c_probe,
316 .id_table = ptn5150_i2c_id,
317};
318module_i2c_driver(ptn5150_i2c_driver);
319
320MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
321MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
322MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
323MODULE_LICENSE("GPL v2");
324
