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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * TI HD3SS3220 Type-C DRP Port Controller Driver
- *
- * Copyright (C) 2019 Renesas Electronics Corp.
- */
- #include <linux/module.h>
- #include <linux/i2c.h>
- #include <linux/usb/role.h>
- #include <linux/irqreturn.h>
- #include <linux/interrupt.h>
- #include <linux/regmap.h>
- #include <linux/slab.h>
- #include <linux/usb/typec.h>
- #include <linux/delay.h>
- #define HD3SS3220_REG_CN_STAT_CTRL 0x09
- #define HD3SS3220_REG_GEN_CTRL 0x0A
- #define HD3SS3220_REG_DEV_REV 0xA0
- /* Register HD3SS3220_REG_CN_STAT_CTRL*/
- #define HD3SS3220_REG_CN_STAT_CTRL_ATTACHED_STATE_MASK (BIT(7) | BIT(6))
- #define HD3SS3220_REG_CN_STAT_CTRL_AS_DFP BIT(6)
- #define HD3SS3220_REG_CN_STAT_CTRL_AS_UFP BIT(7)
- #define HD3SS3220_REG_CN_STAT_CTRL_TO_ACCESSORY (BIT(7) | BIT(6))
- #define HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS BIT(4)
- /* Register HD3SS3220_REG_GEN_CTRL*/
- #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_MASK (BIT(2) | BIT(1))
- #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT 0x00
- #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK BIT(1)
- #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC (BIT(2) | BIT(1))
- struct hd3ss3220 {
- struct device *dev;
- struct regmap *regmap;
- struct usb_role_switch *role_sw;
- struct typec_port *port;
- };
- static int hd3ss3220_set_source_pref(struct hd3ss3220 *hd3ss3220, int src_pref)
- {
- return regmap_update_bits(hd3ss3220->regmap, HD3SS3220_REG_GEN_CTRL,
- HD3SS3220_REG_GEN_CTRL_SRC_PREF_MASK,
- src_pref);
- }
- static enum usb_role hd3ss3220_get_attached_state(struct hd3ss3220 *hd3ss3220)
- {
- unsigned int reg_val;
- enum usb_role attached_state;
- int ret;
- ret = regmap_read(hd3ss3220->regmap, HD3SS3220_REG_CN_STAT_CTRL,
- ®_val);
- if (ret < 0)
- return ret;
- switch (reg_val & HD3SS3220_REG_CN_STAT_CTRL_ATTACHED_STATE_MASK) {
- case HD3SS3220_REG_CN_STAT_CTRL_AS_DFP:
- attached_state = USB_ROLE_HOST;
- break;
- case HD3SS3220_REG_CN_STAT_CTRL_AS_UFP:
- attached_state = USB_ROLE_DEVICE;
- break;
- default:
- attached_state = USB_ROLE_NONE;
- break;
- }
- return attached_state;
- }
- static int hd3ss3220_dr_set(struct typec_port *port, enum typec_data_role role)
- {
- struct hd3ss3220 *hd3ss3220 = typec_get_drvdata(port);
- enum usb_role role_val;
- int pref, ret = 0;
- if (role == TYPEC_HOST) {
- role_val = USB_ROLE_HOST;
- pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC;
- } else {
- role_val = USB_ROLE_DEVICE;
- pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK;
- }
- ret = hd3ss3220_set_source_pref(hd3ss3220, pref);
- usleep_range(10, 100);
- usb_role_switch_set_role(hd3ss3220->role_sw, role_val);
- typec_set_data_role(hd3ss3220->port, role);
- return ret;
- }
- static const struct typec_operations hd3ss3220_ops = {
- .dr_set = hd3ss3220_dr_set
- };
- static void hd3ss3220_set_role(struct hd3ss3220 *hd3ss3220)
- {
- enum usb_role role_state = hd3ss3220_get_attached_state(hd3ss3220);
- usb_role_switch_set_role(hd3ss3220->role_sw, role_state);
- if (role_state == USB_ROLE_NONE)
- hd3ss3220_set_source_pref(hd3ss3220,
- HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
- switch (role_state) {
- case USB_ROLE_HOST:
- typec_set_data_role(hd3ss3220->port, TYPEC_HOST);
- break;
- case USB_ROLE_DEVICE:
- typec_set_data_role(hd3ss3220->port, TYPEC_DEVICE);
- break;
- default:
- break;
- }
- }
- static irqreturn_t hd3ss3220_irq(struct hd3ss3220 *hd3ss3220)
- {
- int err;
- hd3ss3220_set_role(hd3ss3220);
- err = regmap_update_bits_base(hd3ss3220->regmap,
- HD3SS3220_REG_CN_STAT_CTRL,
- HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS,
- HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS,
- NULL, false, true);
- if (err < 0)
- return IRQ_NONE;
- return IRQ_HANDLED;
- }
- static irqreturn_t hd3ss3220_irq_handler(int irq, void *data)
- {
- struct i2c_client *client = to_i2c_client(data);
- struct hd3ss3220 *hd3ss3220 = i2c_get_clientdata(client);
- return hd3ss3220_irq(hd3ss3220);
- }
- static const struct regmap_config config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = 0x0A,
- };
- static int hd3ss3220_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
- {
- struct typec_capability typec_cap = { };
- struct hd3ss3220 *hd3ss3220;
- struct fwnode_handle *connector, *ep;
- int ret;
- unsigned int data;
- hd3ss3220 = devm_kzalloc(&client->dev, sizeof(struct hd3ss3220),
- GFP_KERNEL);
- if (!hd3ss3220)
- return -ENOMEM;
- i2c_set_clientdata(client, hd3ss3220);
- hd3ss3220->dev = &client->dev;
- hd3ss3220->regmap = devm_regmap_init_i2c(client, &config);
- if (IS_ERR(hd3ss3220->regmap))
- return PTR_ERR(hd3ss3220->regmap);
- hd3ss3220_set_source_pref(hd3ss3220,
- HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
- /* For backward compatibility check the connector child node first */
- connector = device_get_named_child_node(hd3ss3220->dev, "connector");
- if (connector) {
- hd3ss3220->role_sw = fwnode_usb_role_switch_get(connector);
- } else {
- ep = fwnode_graph_get_next_endpoint(dev_fwnode(hd3ss3220->dev), NULL);
- if (!ep)
- return -ENODEV;
- connector = fwnode_graph_get_remote_port_parent(ep);
- fwnode_handle_put(ep);
- if (!connector)
- return -ENODEV;
- hd3ss3220->role_sw = usb_role_switch_get(hd3ss3220->dev);
- }
- if (IS_ERR(hd3ss3220->role_sw)) {
- ret = PTR_ERR(hd3ss3220->role_sw);
- goto err_put_fwnode;
- }
- typec_cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
- typec_cap.driver_data = hd3ss3220;
- typec_cap.type = TYPEC_PORT_DRP;
- typec_cap.data = TYPEC_PORT_DRD;
- typec_cap.ops = &hd3ss3220_ops;
- typec_cap.fwnode = connector;
- hd3ss3220->port = typec_register_port(&client->dev, &typec_cap);
- if (IS_ERR(hd3ss3220->port)) {
- ret = PTR_ERR(hd3ss3220->port);
- goto err_put_role;
- }
- hd3ss3220_set_role(hd3ss3220);
- ret = regmap_read(hd3ss3220->regmap, HD3SS3220_REG_CN_STAT_CTRL, &data);
- if (ret < 0)
- goto err_unreg_port;
- if (data & HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS) {
- ret = regmap_write(hd3ss3220->regmap,
- HD3SS3220_REG_CN_STAT_CTRL,
- data | HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS);
- if (ret < 0)
- goto err_unreg_port;
- }
- if (client->irq > 0) {
- ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
- hd3ss3220_irq_handler,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- "hd3ss3220", &client->dev);
- if (ret)
- goto err_unreg_port;
- }
- ret = i2c_smbus_read_byte_data(client, HD3SS3220_REG_DEV_REV);
- if (ret < 0)
- goto err_unreg_port;
- fwnode_handle_put(connector);
- dev_info(&client->dev, "probed revision=0x%x\n", ret);
- return 0;
- err_unreg_port:
- typec_unregister_port(hd3ss3220->port);
- err_put_role:
- usb_role_switch_put(hd3ss3220->role_sw);
- err_put_fwnode:
- fwnode_handle_put(connector);
- return ret;
- }
- static int hd3ss3220_remove(struct i2c_client *client)
- {
- struct hd3ss3220 *hd3ss3220 = i2c_get_clientdata(client);
- typec_unregister_port(hd3ss3220->port);
- usb_role_switch_put(hd3ss3220->role_sw);
- return 0;
- }
- static const struct of_device_id dev_ids[] = {
- { .compatible = "ti,hd3ss3220"},
- {}
- };
- MODULE_DEVICE_TABLE(of, dev_ids);
- static struct i2c_driver hd3ss3220_driver = {
- .driver = {
- .name = "hd3ss3220",
- .of_match_table = of_match_ptr(dev_ids),
- },
- .probe = hd3ss3220_probe,
- .remove = hd3ss3220_remove,
- };
- module_i2c_driver(hd3ss3220_driver);
- MODULE_AUTHOR("Biju Das <biju.das@bp.renesas.com>");
- MODULE_DESCRIPTION("TI HD3SS3220 DRP Port Controller Driver");
- MODULE_LICENSE("GPL");
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