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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
4  */
5 
6 #include <linux/err.h>
7 #include <linux/interrupt.h>
8 #include <linux/kernel.h>
9 #include <linux/mod_devicetable.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 #include <linux/regulator/consumer.h>
14 #include <linux/slab.h>
15 #include <linux/usb/role.h>
16 #include <linux/usb/typec_mux.h>
17 
18 #define TYPEC_MISC_STATUS		0xb
19 #define CC_ATTACHED			BIT(0)
20 #define CC_ORIENTATION			BIT(1)
21 #define SNK_SRC_MODE			BIT(6)
22 #define TYPEC_MODE_CFG			0x44
23 #define TYPEC_DISABLE_CMD		BIT(0)
24 #define EN_SNK_ONLY			BIT(1)
25 #define EN_SRC_ONLY			BIT(2)
26 #define TYPEC_VCONN_CONTROL		0x46
27 #define VCONN_EN_SRC			BIT(0)
28 #define VCONN_EN_VAL			BIT(1)
29 #define TYPEC_EXIT_STATE_CFG		0x50
30 #define SEL_SRC_UPPER_REF		BIT(2)
31 #define TYPEC_INTR_EN_CFG_1		0x5e
32 #define TYPEC_INTR_EN_CFG_1_MASK	GENMASK(7, 0)
33 
34 struct qcom_pmic_typec {
35 	struct device		*dev;
36 	struct regmap		*regmap;
37 	u32			base;
38 
39 	struct typec_port	*port;
40 	struct usb_role_switch *role_sw;
41 
42 	struct regulator	*vbus_reg;
43 	bool			vbus_enabled;
44 };
45 
qcom_pmic_typec_enable_vbus_regulator(struct qcom_pmic_typec * qcom_usb,bool enable)46 static void qcom_pmic_typec_enable_vbus_regulator(struct qcom_pmic_typec
47 							*qcom_usb, bool enable)
48 {
49 	int ret;
50 
51 	if (enable == qcom_usb->vbus_enabled)
52 		return;
53 
54 	if (enable) {
55 		ret = regulator_enable(qcom_usb->vbus_reg);
56 		if (ret)
57 			return;
58 	} else {
59 		ret = regulator_disable(qcom_usb->vbus_reg);
60 		if (ret)
61 			return;
62 	}
63 	qcom_usb->vbus_enabled = enable;
64 }
65 
qcom_pmic_typec_check_connection(struct qcom_pmic_typec * qcom_usb)66 static void qcom_pmic_typec_check_connection(struct qcom_pmic_typec *qcom_usb)
67 {
68 	enum typec_orientation orientation;
69 	enum usb_role role;
70 	unsigned int stat;
71 	bool enable_vbus;
72 
73 	regmap_read(qcom_usb->regmap, qcom_usb->base + TYPEC_MISC_STATUS,
74 		    &stat);
75 
76 	if (stat & CC_ATTACHED) {
77 		orientation = (stat & CC_ORIENTATION) ?
78 				TYPEC_ORIENTATION_REVERSE :
79 				TYPEC_ORIENTATION_NORMAL;
80 		typec_set_orientation(qcom_usb->port, orientation);
81 
82 		role = (stat & SNK_SRC_MODE) ? USB_ROLE_HOST : USB_ROLE_DEVICE;
83 		if (role == USB_ROLE_HOST)
84 			enable_vbus = true;
85 		else
86 			enable_vbus = false;
87 	} else {
88 		role = USB_ROLE_NONE;
89 		enable_vbus = false;
90 	}
91 
92 	qcom_pmic_typec_enable_vbus_regulator(qcom_usb, enable_vbus);
93 	usb_role_switch_set_role(qcom_usb->role_sw, role);
94 }
95 
qcom_pmic_typec_interrupt(int irq,void * _qcom_usb)96 static irqreturn_t qcom_pmic_typec_interrupt(int irq, void *_qcom_usb)
97 {
98 	struct qcom_pmic_typec *qcom_usb = _qcom_usb;
99 
100 	qcom_pmic_typec_check_connection(qcom_usb);
101 	return IRQ_HANDLED;
102 }
103 
qcom_pmic_typec_typec_hw_init(struct qcom_pmic_typec * qcom_usb,enum typec_port_type type)104 static void qcom_pmic_typec_typec_hw_init(struct qcom_pmic_typec *qcom_usb,
105 					  enum typec_port_type type)
106 {
107 	u8 mode = 0;
108 
109 	regmap_update_bits(qcom_usb->regmap,
110 			   qcom_usb->base + TYPEC_INTR_EN_CFG_1,
111 			   TYPEC_INTR_EN_CFG_1_MASK, 0);
112 
113 	if (type == TYPEC_PORT_SRC)
114 		mode = EN_SRC_ONLY;
115 	else if (type == TYPEC_PORT_SNK)
116 		mode = EN_SNK_ONLY;
117 
118 	regmap_update_bits(qcom_usb->regmap, qcom_usb->base + TYPEC_MODE_CFG,
119 			   EN_SNK_ONLY | EN_SRC_ONLY, mode);
120 
121 	regmap_update_bits(qcom_usb->regmap,
122 			   qcom_usb->base + TYPEC_VCONN_CONTROL,
123 			   VCONN_EN_SRC | VCONN_EN_VAL, VCONN_EN_SRC);
124 	regmap_update_bits(qcom_usb->regmap,
125 			   qcom_usb->base + TYPEC_EXIT_STATE_CFG,
126 			   SEL_SRC_UPPER_REF, SEL_SRC_UPPER_REF);
127 }
128 
qcom_pmic_typec_probe(struct platform_device * pdev)129 static int qcom_pmic_typec_probe(struct platform_device *pdev)
130 {
131 	struct qcom_pmic_typec *qcom_usb;
132 	struct device *dev = &pdev->dev;
133 	struct fwnode_handle *fwnode;
134 	struct typec_capability cap;
135 	const char *buf;
136 	int ret, irq, role;
137 	u32 reg;
138 
139 	ret = device_property_read_u32(dev, "reg", &reg);
140 	if (ret < 0) {
141 		dev_err(dev, "missing base address\n");
142 		return ret;
143 	}
144 
145 	qcom_usb = devm_kzalloc(dev, sizeof(*qcom_usb), GFP_KERNEL);
146 	if (!qcom_usb)
147 		return -ENOMEM;
148 
149 	qcom_usb->dev = dev;
150 	qcom_usb->base = reg;
151 
152 	qcom_usb->regmap = dev_get_regmap(dev->parent, NULL);
153 	if (!qcom_usb->regmap) {
154 		dev_err(dev, "Failed to get regmap\n");
155 		return -EINVAL;
156 	}
157 
158 	qcom_usb->vbus_reg = devm_regulator_get(qcom_usb->dev, "usb_vbus");
159 	if (IS_ERR(qcom_usb->vbus_reg))
160 		return PTR_ERR(qcom_usb->vbus_reg);
161 
162 	fwnode = device_get_named_child_node(dev, "connector");
163 	if (!fwnode)
164 		return -EINVAL;
165 
166 	ret = fwnode_property_read_string(fwnode, "power-role", &buf);
167 	if (!ret) {
168 		role = typec_find_port_power_role(buf);
169 		if (role < 0)
170 			role = TYPEC_PORT_SNK;
171 	} else {
172 		role = TYPEC_PORT_SNK;
173 	}
174 	cap.type = role;
175 
176 	ret = fwnode_property_read_string(fwnode, "data-role", &buf);
177 	if (!ret) {
178 		role = typec_find_port_data_role(buf);
179 		if (role < 0)
180 			role = TYPEC_PORT_UFP;
181 	} else {
182 		role = TYPEC_PORT_UFP;
183 	}
184 	cap.data = role;
185 
186 	cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
187 	cap.fwnode = fwnode;
188 	qcom_usb->port = typec_register_port(dev, &cap);
189 	if (IS_ERR(qcom_usb->port)) {
190 		ret = PTR_ERR(qcom_usb->port);
191 		dev_err(dev, "Failed to register type c port %d\n", ret);
192 		goto err_put_node;
193 	}
194 	fwnode_handle_put(fwnode);
195 
196 	qcom_usb->role_sw = fwnode_usb_role_switch_get(dev_fwnode(qcom_usb->dev));
197 	if (IS_ERR(qcom_usb->role_sw)) {
198 		if (PTR_ERR(qcom_usb->role_sw) != -EPROBE_DEFER)
199 			dev_err(dev, "failed to get role switch\n");
200 		ret = PTR_ERR(qcom_usb->role_sw);
201 		goto err_typec_port;
202 	}
203 
204 	irq = platform_get_irq(pdev, 0);
205 	if (irq < 0)
206 		goto err_usb_role_sw;
207 
208 	ret = devm_request_threaded_irq(qcom_usb->dev, irq, NULL,
209 					qcom_pmic_typec_interrupt, IRQF_ONESHOT,
210 					"qcom-pmic-typec", qcom_usb);
211 	if (ret) {
212 		dev_err(&pdev->dev, "Could not request IRQ\n");
213 		goto err_usb_role_sw;
214 	}
215 
216 	platform_set_drvdata(pdev, qcom_usb);
217 	qcom_pmic_typec_typec_hw_init(qcom_usb, cap.type);
218 	qcom_pmic_typec_check_connection(qcom_usb);
219 
220 	return 0;
221 
222 err_usb_role_sw:
223 	usb_role_switch_put(qcom_usb->role_sw);
224 err_typec_port:
225 	typec_unregister_port(qcom_usb->port);
226 err_put_node:
227 	fwnode_handle_put(fwnode);
228 
229 	return ret;
230 }
231 
qcom_pmic_typec_remove(struct platform_device * pdev)232 static int qcom_pmic_typec_remove(struct platform_device *pdev)
233 {
234 	struct qcom_pmic_typec *qcom_usb = platform_get_drvdata(pdev);
235 
236 	usb_role_switch_set_role(qcom_usb->role_sw, USB_ROLE_NONE);
237 	qcom_pmic_typec_enable_vbus_regulator(qcom_usb, 0);
238 
239 	typec_unregister_port(qcom_usb->port);
240 	usb_role_switch_put(qcom_usb->role_sw);
241 
242 	return 0;
243 }
244 
245 static const struct of_device_id qcom_pmic_typec_table[] = {
246 	{ .compatible = "qcom,pm8150b-usb-typec" },
247 	{ }
248 };
249 MODULE_DEVICE_TABLE(of, qcom_pmic_typec_table);
250 
251 static struct platform_driver qcom_pmic_typec = {
252 	.driver = {
253 		.name = "qcom,pmic-typec",
254 		.of_match_table = qcom_pmic_typec_table,
255 	},
256 	.probe = qcom_pmic_typec_probe,
257 	.remove = qcom_pmic_typec_remove,
258 };
259 module_platform_driver(qcom_pmic_typec);
260 
261 MODULE_DESCRIPTION("QCOM PMIC USB type C driver");
262 MODULE_LICENSE("GPL v2");
263