tcpci_mt6370.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2022 Richtek Technology Corp.
  4 *
  5 * Author: ChiYuan Huang <cy_huang@richtek.com>
  6 */
  7
  8#include <linux/bits.h>
  9#include <linux/interrupt.h>
 10#include <linux/kernel.h>
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/pm_wakeirq.h>
 15#include <linux/regmap.h>
 16#include <linux/regulator/consumer.h>
 17#include <linux/usb/tcpci.h>
 18#include <linux/usb/tcpm.h>
 19
 20#define MT6370_REG_SYSCTRL8	0x9B
 21
 22#define MT6370_AUTOIDLE_MASK	BIT(3)
 23
 24#define MT6370_VENDOR_ID	0x29CF
 25#define MT6370_TCPC_DID_A	0x2170
 26
 27struct mt6370_priv {
 28	struct device *dev;
 29	struct regulator *vbus;
 30	struct tcpci *tcpci;
 31	struct tcpci_data tcpci_data;
 32};
 33
 34static const struct reg_sequence mt6370_reg_init[] = {
 35	REG_SEQ(0xA0, 0x1, 1000),
 36	REG_SEQ(0x81, 0x38, 0),
 37	REG_SEQ(0x82, 0x82, 0),
 38	REG_SEQ(0xBA, 0xFC, 0),
 39	REG_SEQ(0xBB, 0x50, 0),
 40	REG_SEQ(0x9E, 0x8F, 0),
 41	REG_SEQ(0xA1, 0x5, 0),
 42	REG_SEQ(0xA2, 0x4, 0),
 43	REG_SEQ(0xA3, 0x4A, 0),
 44	REG_SEQ(0xA4, 0x01, 0),
 45	REG_SEQ(0x95, 0x01, 0),
 46	REG_SEQ(0x80, 0x71, 0),
 47	REG_SEQ(0x9B, 0x3A, 1000),
 48};
 49
 50static int mt6370_tcpc_init(struct tcpci *tcpci, struct tcpci_data *data)
 51{
 52	u16 did;
 53	int ret;
 54
 55	ret = regmap_register_patch(data->regmap, mt6370_reg_init,
 56				    ARRAY_SIZE(mt6370_reg_init));
 57	if (ret)
 58		return ret;
 59
 60	ret = regmap_raw_read(data->regmap, TCPC_BCD_DEV, &did, sizeof(u16));
 61	if (ret)
 62		return ret;
 63
 64	if (did == MT6370_TCPC_DID_A)
 65		return regmap_write(data->regmap, TCPC_FAULT_CTRL, 0x80);
 66
 67	return 0;
 68}
 69
 70static int mt6370_tcpc_set_vconn(struct tcpci *tcpci, struct tcpci_data *data,
 71				 bool enable)
 72{
 73	return regmap_update_bits(data->regmap, MT6370_REG_SYSCTRL8,
 74				  MT6370_AUTOIDLE_MASK,
 75				  enable ? 0 : MT6370_AUTOIDLE_MASK);
 76}
 77
 78static int mt6370_tcpc_set_vbus(struct tcpci *tcpci, struct tcpci_data *data,
 79				bool source, bool sink)
 80{
 81	struct mt6370_priv *priv = container_of(data, struct mt6370_priv,
 82						tcpci_data);
 83	int ret;
 84
 85	ret = regulator_is_enabled(priv->vbus);
 86	if (ret < 0)
 87		return ret;
 88
 89	if (ret && !source)
 90		return regulator_disable(priv->vbus);
 91
 92	if (!ret && source)
 93		return regulator_enable(priv->vbus);
 94
 95	return 0;
 96}
 97
 98static irqreturn_t mt6370_irq_handler(int irq, void *dev_id)
 99{
100	struct mt6370_priv *priv = dev_id;
101
102	return tcpci_irq(priv->tcpci);
103}
104
105static int mt6370_check_vendor_info(struct mt6370_priv *priv)
106{
107	struct regmap *regmap = priv->tcpci_data.regmap;
108	u16 vid;
109	int ret;
110
111	ret = regmap_raw_read(regmap, TCPC_VENDOR_ID, &vid, sizeof(u16));
112	if (ret)
113		return ret;
114
115	if (vid != MT6370_VENDOR_ID)
116		return dev_err_probe(priv->dev, -ENODEV,
117				     "Vendor ID not correct 0x%02x\n", vid);
118
119	return 0;
120}
121
122static void mt6370_unregister_tcpci_port(void *tcpci)
123{
124	tcpci_unregister_port(tcpci);
125}
126
127static int mt6370_tcpc_probe(struct platform_device *pdev)
128{
129	struct mt6370_priv *priv;
130	struct device *dev = &pdev->dev;
131	int irq, ret;
132
133	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
134	if (!priv)
135		return -ENOMEM;
136
137	priv->dev = dev;
138
139	priv->tcpci_data.regmap = dev_get_regmap(dev->parent, NULL);
140	if (!priv->tcpci_data.regmap)
141		return dev_err_probe(dev, -ENODEV, "Failed to init regmap\n");
142
143	ret = mt6370_check_vendor_info(priv);
144	if (ret)
145		return ret;
146
147	irq = platform_get_irq(pdev, 0);
148	if (irq < 0)
149		return irq;
150
151	/* Assign TCPCI feature and ops */
152	priv->tcpci_data.auto_discharge_disconnect = 1;
153	priv->tcpci_data.init = mt6370_tcpc_init;
154	priv->tcpci_data.set_vconn = mt6370_tcpc_set_vconn;
155
156	priv->vbus = devm_regulator_get_optional(dev, "vbus");
157	if (!IS_ERR(priv->vbus))
158		priv->tcpci_data.set_vbus = mt6370_tcpc_set_vbus;
159
160	priv->tcpci = tcpci_register_port(dev, &priv->tcpci_data);
161	if (IS_ERR(priv->tcpci))
162		return dev_err_probe(dev, PTR_ERR(priv->tcpci),
163				     "Failed to register tcpci port\n");
164
165	ret = devm_add_action_or_reset(dev, mt6370_unregister_tcpci_port, priv->tcpci);
166	if (ret)
167		return ret;
168
169	ret = devm_request_threaded_irq(dev, irq, NULL, mt6370_irq_handler,
170					IRQF_ONESHOT, dev_name(dev), priv);
171	if (ret)
172		return dev_err_probe(dev, ret, "Failed to allocate irq\n");
173
174	device_init_wakeup(dev, true);
175	dev_pm_set_wake_irq(dev, irq);
176
177	return 0;
178}
179
180static void mt6370_tcpc_remove(struct platform_device *pdev)
181{
182	dev_pm_clear_wake_irq(&pdev->dev);
183	device_init_wakeup(&pdev->dev, false);
184}
185
186static const struct of_device_id mt6370_tcpc_devid_table[] = {
187	{ .compatible = "mediatek,mt6370-tcpc" },
188	{}
189};
190MODULE_DEVICE_TABLE(of, mt6370_tcpc_devid_table);
191
192static struct platform_driver mt6370_tcpc_driver = {
193	.driver = {
194		.name = "mt6370-tcpc",
195		.of_match_table = mt6370_tcpc_devid_table,
196	},
197	.probe = mt6370_tcpc_probe,
198	.remove = mt6370_tcpc_remove,
199};
200module_platform_driver(mt6370_tcpc_driver);
201
202MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
203MODULE_DESCRIPTION("MT6370 USB Type-C Port Controller Interface Driver");
204MODULE_LICENSE("GPL v2");