1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * TI HD3SS3220 Type-C DRP Port Controller Driver
4 *
5 * Copyright (C) 2019 Renesas Electronics Corp.
6 */
7
8 #include <linux/module.h>
9 #include <linux/i2c.h>
10 #include <linux/usb/role.h>
11 #include <linux/irqreturn.h>
12 #include <linux/interrupt.h>
13 #include <linux/regmap.h>
14 #include <linux/slab.h>
15 #include <linux/usb/typec.h>
16 #include <linux/delay.h>
17
18 #define HD3SS3220_REG_CN_STAT_CTRL 0x09
19 #define HD3SS3220_REG_GEN_CTRL 0x0A
20 #define HD3SS3220_REG_DEV_REV 0xA0
21
22 /* Register HD3SS3220_REG_CN_STAT_CTRL*/
23 #define HD3SS3220_REG_CN_STAT_CTRL_ATTACHED_STATE_MASK (BIT(7) | BIT(6))
24 #define HD3SS3220_REG_CN_STAT_CTRL_AS_DFP BIT(6)
25 #define HD3SS3220_REG_CN_STAT_CTRL_AS_UFP BIT(7)
26 #define HD3SS3220_REG_CN_STAT_CTRL_TO_ACCESSORY (BIT(7) | BIT(6))
27 #define HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS BIT(4)
28
29 /* Register HD3SS3220_REG_GEN_CTRL*/
30 #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_MASK (BIT(2) | BIT(1))
31 #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT 0x00
32 #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK BIT(1)
33 #define HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC (BIT(2) | BIT(1))
34
35 struct hd3ss3220 {
36 struct device *dev;
37 struct regmap *regmap;
38 struct usb_role_switch *role_sw;
39 struct typec_port *port;
40 };
41
hd3ss3220_set_source_pref(struct hd3ss3220 * hd3ss3220,int src_pref)42 static int hd3ss3220_set_source_pref(struct hd3ss3220 *hd3ss3220, int src_pref)
43 {
44 return regmap_update_bits(hd3ss3220->regmap, HD3SS3220_REG_GEN_CTRL,
45 HD3SS3220_REG_GEN_CTRL_SRC_PREF_MASK,
46 src_pref);
47 }
48
hd3ss3220_get_attached_state(struct hd3ss3220 * hd3ss3220)49 static enum usb_role hd3ss3220_get_attached_state(struct hd3ss3220 *hd3ss3220)
50 {
51 unsigned int reg_val;
52 enum usb_role attached_state;
53 int ret;
54
55 ret = regmap_read(hd3ss3220->regmap, HD3SS3220_REG_CN_STAT_CTRL,
56 ®_val);
57 if (ret < 0)
58 return ret;
59
60 switch (reg_val & HD3SS3220_REG_CN_STAT_CTRL_ATTACHED_STATE_MASK) {
61 case HD3SS3220_REG_CN_STAT_CTRL_AS_DFP:
62 attached_state = USB_ROLE_HOST;
63 break;
64 case HD3SS3220_REG_CN_STAT_CTRL_AS_UFP:
65 attached_state = USB_ROLE_DEVICE;
66 break;
67 default:
68 attached_state = USB_ROLE_NONE;
69 break;
70 }
71
72 return attached_state;
73 }
74
hd3ss3220_dr_set(struct typec_port * port,enum typec_data_role role)75 static int hd3ss3220_dr_set(struct typec_port *port, enum typec_data_role role)
76 {
77 struct hd3ss3220 *hd3ss3220 = typec_get_drvdata(port);
78 enum usb_role role_val;
79 int pref, ret = 0;
80
81 if (role == TYPEC_HOST) {
82 role_val = USB_ROLE_HOST;
83 pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SRC;
84 } else {
85 role_val = USB_ROLE_DEVICE;
86 pref = HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_TRY_SNK;
87 }
88
89 ret = hd3ss3220_set_source_pref(hd3ss3220, pref);
90 usleep_range(10, 100);
91
92 usb_role_switch_set_role(hd3ss3220->role_sw, role_val);
93 typec_set_data_role(hd3ss3220->port, role);
94
95 return ret;
96 }
97
98 static const struct typec_operations hd3ss3220_ops = {
99 .dr_set = hd3ss3220_dr_set
100 };
101
hd3ss3220_set_role(struct hd3ss3220 * hd3ss3220)102 static void hd3ss3220_set_role(struct hd3ss3220 *hd3ss3220)
103 {
104 enum usb_role role_state = hd3ss3220_get_attached_state(hd3ss3220);
105
106 usb_role_switch_set_role(hd3ss3220->role_sw, role_state);
107 if (role_state == USB_ROLE_NONE)
108 hd3ss3220_set_source_pref(hd3ss3220,
109 HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
110
111 switch (role_state) {
112 case USB_ROLE_HOST:
113 typec_set_data_role(hd3ss3220->port, TYPEC_HOST);
114 break;
115 case USB_ROLE_DEVICE:
116 typec_set_data_role(hd3ss3220->port, TYPEC_DEVICE);
117 break;
118 default:
119 break;
120 }
121 }
122
hd3ss3220_irq(struct hd3ss3220 * hd3ss3220)123 static irqreturn_t hd3ss3220_irq(struct hd3ss3220 *hd3ss3220)
124 {
125 int err;
126
127 hd3ss3220_set_role(hd3ss3220);
128 err = regmap_write_bits(hd3ss3220->regmap, HD3SS3220_REG_CN_STAT_CTRL,
129 HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS,
130 HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS);
131 if (err < 0)
132 return IRQ_NONE;
133
134 return IRQ_HANDLED;
135 }
136
hd3ss3220_irq_handler(int irq,void * data)137 static irqreturn_t hd3ss3220_irq_handler(int irq, void *data)
138 {
139 struct i2c_client *client = to_i2c_client(data);
140 struct hd3ss3220 *hd3ss3220 = i2c_get_clientdata(client);
141
142 return hd3ss3220_irq(hd3ss3220);
143 }
144
145 static const struct regmap_config config = {
146 .reg_bits = 8,
147 .val_bits = 8,
148 .max_register = 0x0A,
149 };
150
hd3ss3220_probe(struct i2c_client * client,const struct i2c_device_id * id)151 static int hd3ss3220_probe(struct i2c_client *client,
152 const struct i2c_device_id *id)
153 {
154 struct typec_capability typec_cap = { };
155 struct hd3ss3220 *hd3ss3220;
156 struct fwnode_handle *connector, *ep;
157 int ret;
158 unsigned int data;
159
160 hd3ss3220 = devm_kzalloc(&client->dev, sizeof(struct hd3ss3220),
161 GFP_KERNEL);
162 if (!hd3ss3220)
163 return -ENOMEM;
164
165 i2c_set_clientdata(client, hd3ss3220);
166
167 hd3ss3220->dev = &client->dev;
168 hd3ss3220->regmap = devm_regmap_init_i2c(client, &config);
169 if (IS_ERR(hd3ss3220->regmap))
170 return PTR_ERR(hd3ss3220->regmap);
171
172 hd3ss3220_set_source_pref(hd3ss3220,
173 HD3SS3220_REG_GEN_CTRL_SRC_PREF_DRP_DEFAULT);
174 /* For backward compatibility check the connector child node first */
175 connector = device_get_named_child_node(hd3ss3220->dev, "connector");
176 if (connector) {
177 hd3ss3220->role_sw = fwnode_usb_role_switch_get(connector);
178 } else {
179 ep = fwnode_graph_get_next_endpoint(dev_fwnode(hd3ss3220->dev), NULL);
180 if (!ep)
181 return -ENODEV;
182 connector = fwnode_graph_get_remote_port_parent(ep);
183 fwnode_handle_put(ep);
184 if (!connector)
185 return -ENODEV;
186 hd3ss3220->role_sw = usb_role_switch_get(hd3ss3220->dev);
187 }
188
189 if (IS_ERR(hd3ss3220->role_sw)) {
190 ret = PTR_ERR(hd3ss3220->role_sw);
191 goto err_put_fwnode;
192 }
193
194 typec_cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
195 typec_cap.driver_data = hd3ss3220;
196 typec_cap.type = TYPEC_PORT_DRP;
197 typec_cap.data = TYPEC_PORT_DRD;
198 typec_cap.ops = &hd3ss3220_ops;
199 typec_cap.fwnode = connector;
200
201 hd3ss3220->port = typec_register_port(&client->dev, &typec_cap);
202 if (IS_ERR(hd3ss3220->port)) {
203 ret = PTR_ERR(hd3ss3220->port);
204 goto err_put_role;
205 }
206
207 hd3ss3220_set_role(hd3ss3220);
208 ret = regmap_read(hd3ss3220->regmap, HD3SS3220_REG_CN_STAT_CTRL, &data);
209 if (ret < 0)
210 goto err_unreg_port;
211
212 if (data & HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS) {
213 ret = regmap_write(hd3ss3220->regmap,
214 HD3SS3220_REG_CN_STAT_CTRL,
215 data | HD3SS3220_REG_CN_STAT_CTRL_INT_STATUS);
216 if (ret < 0)
217 goto err_unreg_port;
218 }
219
220 if (client->irq > 0) {
221 ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
222 hd3ss3220_irq_handler,
223 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
224 "hd3ss3220", &client->dev);
225 if (ret)
226 goto err_unreg_port;
227 }
228
229 ret = i2c_smbus_read_byte_data(client, HD3SS3220_REG_DEV_REV);
230 if (ret < 0)
231 goto err_unreg_port;
232
233 fwnode_handle_put(connector);
234
235 dev_info(&client->dev, "probed revision=0x%x\n", ret);
236
237 return 0;
238 err_unreg_port:
239 typec_unregister_port(hd3ss3220->port);
240 err_put_role:
241 usb_role_switch_put(hd3ss3220->role_sw);
242 err_put_fwnode:
243 fwnode_handle_put(connector);
244
245 return ret;
246 }
247
hd3ss3220_remove(struct i2c_client * client)248 static int hd3ss3220_remove(struct i2c_client *client)
249 {
250 struct hd3ss3220 *hd3ss3220 = i2c_get_clientdata(client);
251
252 typec_unregister_port(hd3ss3220->port);
253 usb_role_switch_put(hd3ss3220->role_sw);
254
255 return 0;
256 }
257
258 static const struct of_device_id dev_ids[] = {
259 { .compatible = "ti,hd3ss3220"},
260 {}
261 };
262 MODULE_DEVICE_TABLE(of, dev_ids);
263
264 static struct i2c_driver hd3ss3220_driver = {
265 .driver = {
266 .name = "hd3ss3220",
267 .of_match_table = of_match_ptr(dev_ids),
268 },
269 .probe = hd3ss3220_probe,
270 .remove = hd3ss3220_remove,
271 };
272
273 module_i2c_driver(hd3ss3220_driver);
274
275 MODULE_AUTHOR("Biju Das <biju.das@bp.renesas.com>");
276 MODULE_DESCRIPTION("TI HD3SS3220 DRP Port Controller Driver");
277 MODULE_LICENSE("GPL");
278