summaryrefslogtreecommitdiff
path: root/drivers/extcon/extcon-ptn5150.c
blob: 4616da7e5430ea54849b06c47d06b35a42917ac4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
// SPDX-License-Identifier: GPL-2.0+
//
// extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
//
// Based on extcon-sm5502.c driver
// Copyright (c) 2018-2019 by Vijai Kumar K
// Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
// Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>

#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/extcon-provider.h>
#include <linux/gpio/consumer.h>
#include <linux/usb/role.h>

/* PTN5150 registers */
#define PTN5150_REG_DEVICE_ID			0x01
#define PTN5150_REG_CONTROL			0x02
#define PTN5150_REG_INT_STATUS			0x03
#define PTN5150_REG_CC_STATUS			0x04
#define PTN5150_REG_CON_DET			0x09
#define PTN5150_REG_VCONN_STATUS		0x0a
#define PTN5150_REG_RESET			0x0b
#define PTN5150_REG_INT_MASK			0x18
#define PTN5150_REG_INT_REG_STATUS		0x19
#define PTN5150_REG_END				PTN5150_REG_INT_REG_STATUS

#define PTN5150_DFP_ATTACHED			0x1
#define PTN5150_UFP_ATTACHED			0x2

/* Define PTN5150 MASK/SHIFT constant */
#define PTN5150_REG_DEVICE_ID_VERSION		GENMASK(7, 3)
#define PTN5150_REG_DEVICE_ID_VENDOR		GENMASK(2, 0)

#define PTN5150_REG_CC_PORT_ATTACHMENT		GENMASK(4, 2)
#define PTN5150_REG_CC_VBUS_DETECTION		BIT(7)
#define PTN5150_REG_INT_CABLE_ATTACH_MASK	BIT(0)
#define PTN5150_REG_INT_CABLE_DETACH_MASK	BIT(1)

struct ptn5150_info {
	struct device *dev;
	struct extcon_dev *edev;
	struct i2c_client *i2c;
	struct regmap *regmap;
	struct gpio_desc *int_gpiod;
	struct gpio_desc *vbus_gpiod;
	int irq;
	struct work_struct irq_work;
	struct mutex mutex;
	struct usb_role_switch *role_sw;
};

/* List of detectable cables */
static const unsigned int ptn5150_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static const struct regmap_config ptn5150_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= PTN5150_REG_END,
};

static void ptn5150_check_state(struct ptn5150_info *info)
{
	unsigned int port_status, reg_data, vbus;
	enum usb_role usb_role = USB_ROLE_NONE;
	int ret;

	ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
	if (ret) {
		dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
		return;
	}

	port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data);

	switch (port_status) {
	case PTN5150_DFP_ATTACHED:
		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
		gpiod_set_value_cansleep(info->vbus_gpiod, 0);
		extcon_set_state_sync(info->edev, EXTCON_USB, true);
		usb_role = USB_ROLE_DEVICE;
		break;
	case PTN5150_UFP_ATTACHED:
		extcon_set_state_sync(info->edev, EXTCON_USB, false);
		vbus = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data);
		if (vbus)
			gpiod_set_value_cansleep(info->vbus_gpiod, 0);
		else
			gpiod_set_value_cansleep(info->vbus_gpiod, 1);

		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
		usb_role = USB_ROLE_HOST;
		break;
	default:
		break;
	}

	if (usb_role) {
		ret = usb_role_switch_set_role(info->role_sw, usb_role);
		if (ret)
			dev_err(info->dev, "failed to set %s role: %d\n",
				usb_role_string(usb_role), ret);
	}
}

static void ptn5150_irq_work(struct work_struct *work)
{
	struct ptn5150_info *info = container_of(work,
			struct ptn5150_info, irq_work);
	int ret = 0;
	unsigned int int_status;

	if (!info->edev)
		return;

	mutex_lock(&info->mutex);

	/* Clear interrupt. Read would clear the register */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
	if (ret) {
		dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
		mutex_unlock(&info->mutex);
		return;
	}

	if (int_status) {
		unsigned int cable_attach;

		cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
		if (cable_attach) {
			ptn5150_check_state(info);
		} else {
			extcon_set_state_sync(info->edev,
					EXTCON_USB_HOST, false);
			extcon_set_state_sync(info->edev,
					EXTCON_USB, false);
			gpiod_set_value_cansleep(info->vbus_gpiod, 0);

			ret = usb_role_switch_set_role(info->role_sw,
						       USB_ROLE_NONE);
			if (ret)
				dev_err(info->dev,
					"failed to set none role: %d\n",
					ret);
		}
	}

	/* Clear interrupt. Read would clear the register */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
			&int_status);
	if (ret) {
		dev_err(info->dev,
			"failed to read INT REG STATUS %d\n", ret);
		mutex_unlock(&info->mutex);
		return;
	}

	mutex_unlock(&info->mutex);
}


static irqreturn_t ptn5150_irq_handler(int irq, void *data)
{
	struct ptn5150_info *info = data;

	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
}

static int ptn5150_init_dev_type(struct ptn5150_info *info)
{
	unsigned int reg_data, vendor_id, version_id;
	int ret;

	ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
	if (ret) {
		dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
		return -EINVAL;
	}

	vendor_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data);
	version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data);
	dev_dbg(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
		version_id, vendor_id);

	/* Clear any existing interrupts */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
	if (ret) {
		dev_err(info->dev,
			"failed to read PTN5150_REG_INT_STATUS %d\n",
			ret);
		return -EINVAL;
	}

	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
	if (ret) {
		dev_err(info->dev,
			"failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
		return -EINVAL;
	}

	return 0;
}

static void ptn5150_work_sync_and_put(void *data)
{
	struct ptn5150_info *info = data;

	cancel_work_sync(&info->irq_work);
	usb_role_switch_put(info->role_sw);
}

static int ptn5150_i2c_probe(struct i2c_client *i2c)
{
	struct device *dev = &i2c->dev;
	struct device_node *np = i2c->dev.of_node;
	struct ptn5150_info *info;
	int ret;

	if (!np)
		return -EINVAL;

	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	i2c_set_clientdata(i2c, info);

	info->dev = &i2c->dev;
	info->i2c = i2c;
	info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW);
	if (IS_ERR(info->vbus_gpiod)) {
		ret = PTR_ERR(info->vbus_gpiod);
		if (ret == -ENOENT) {
			dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n");
			info->vbus_gpiod = NULL;
		} else {
			return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n");
		}
	}

	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, ptn5150_irq_work);

	info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
	if (IS_ERR(info->regmap)) {
		return dev_err_probe(info->dev, PTR_ERR(info->regmap),
				     "failed to allocate register map\n");
	}

	if (i2c->irq > 0) {
		info->irq = i2c->irq;
	} else {
		info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
		if (IS_ERR(info->int_gpiod)) {
			return dev_err_probe(dev, PTR_ERR(info->int_gpiod),
					     "failed to get INT GPIO\n");
		}

		info->irq = gpiod_to_irq(info->int_gpiod);
		if (info->irq < 0) {
			dev_err(dev, "failed to get INTB IRQ\n");
			return info->irq;
		}
	}

	ret = devm_request_threaded_irq(dev, info->irq, NULL,
					ptn5150_irq_handler,
					IRQF_TRIGGER_FALLING |
					IRQF_ONESHOT,
					i2c->name, info);
	if (ret < 0) {
		dev_err(dev, "failed to request handler for INTB IRQ\n");
		return ret;
	}

	/* Allocate extcon device */
	info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(info->dev, "failed to allocate memory for extcon\n");
		return -ENOMEM;
	}

	/* Register extcon device */
	ret = devm_extcon_dev_register(info->dev, info->edev);
	if (ret) {
		dev_err(info->dev, "failed to register extcon device\n");
		return ret;
	}

	extcon_set_property_capability(info->edev, EXTCON_USB,
					EXTCON_PROP_USB_VBUS);
	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
					EXTCON_PROP_USB_VBUS);
	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
					EXTCON_PROP_USB_TYPEC_POLARITY);

	/* Initialize PTN5150 device and print vendor id and version id */
	ret = ptn5150_init_dev_type(info);
	if (ret)
		return -EINVAL;

	info->role_sw = usb_role_switch_get(info->dev);
	if (IS_ERR(info->role_sw))
		return dev_err_probe(info->dev, PTR_ERR(info->role_sw),
				     "failed to get role switch\n");

	ret = devm_add_action_or_reset(dev, ptn5150_work_sync_and_put, info);
	if (ret)
		return ret;

	/*
	 * Update current extcon state if for example OTG connection was there
	 * before the probe
	 */
	mutex_lock(&info->mutex);
	ptn5150_check_state(info);
	mutex_unlock(&info->mutex);

	return 0;
}

static const struct of_device_id ptn5150_dt_match[] = {
	{ .compatible = "nxp,ptn5150" },
	{ },
};
MODULE_DEVICE_TABLE(of, ptn5150_dt_match);

static const struct i2c_device_id ptn5150_i2c_id[] = {
	{ "ptn5150", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);

static struct i2c_driver ptn5150_i2c_driver = {
	.driver		= {
		.name	= "ptn5150",
		.of_match_table = ptn5150_dt_match,
	},
	.probe		= ptn5150_i2c_probe,
	.id_table = ptn5150_i2c_id,
};
module_i2c_driver(ptn5150_i2c_driver);

MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_LICENSE("GPL v2");