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
 34struct 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
 46static 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
 66static 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
 96static 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
104static 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
129static 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
222err_usb_role_sw:
223	usb_role_switch_put(qcom_usb->role_sw);
224err_typec_port:
225	typec_unregister_port(qcom_usb->port);
226err_put_node:
227	fwnode_handle_put(fwnode);
228
229	return ret;
230}
231
232static 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
245static const struct of_device_id qcom_pmic_typec_table[] = {
246	{ .compatible = "qcom,pm8150b-usb-typec" },
247	{ }
248};
249MODULE_DEVICE_TABLE(of, qcom_pmic_typec_table);
250
251static 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};
259module_platform_driver(qcom_pmic_typec);
260
261MODULE_DESCRIPTION("QCOM PMIC USB type C driver");
262MODULE_LICENSE("GPL v2");