1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Pericom PI3USB30532 Type-C cross switch / mux driver
4 *
5 * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com>
6 */
7
8 #include <linux/i2c.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/usb/typec_dp.h>
13 #include <linux/usb/typec_mux.h>
14
15 #define PI3USB30532_CONF 0x00
16
17 #define PI3USB30532_CONF_OPEN 0x00
18 #define PI3USB30532_CONF_SWAP 0x01
19 #define PI3USB30532_CONF_4LANE_DP 0x02
20 #define PI3USB30532_CONF_USB3 0x04
21 #define PI3USB30532_CONF_USB3_AND_2LANE_DP 0x06
22
23 struct pi3usb30532 {
24 struct i2c_client *client;
25 struct mutex lock; /* protects the cached conf register */
26 struct typec_switch *sw;
27 struct typec_mux *mux;
28 u8 conf;
29 };
30
pi3usb30532_set_conf(struct pi3usb30532 * pi,u8 new_conf)31 static int pi3usb30532_set_conf(struct pi3usb30532 *pi, u8 new_conf)
32 {
33 int ret = 0;
34
35 if (pi->conf == new_conf)
36 return 0;
37
38 ret = i2c_smbus_write_byte_data(pi->client, PI3USB30532_CONF, new_conf);
39 if (ret) {
40 dev_err(&pi->client->dev, "Error writing conf: %d\n", ret);
41 return ret;
42 }
43
44 pi->conf = new_conf;
45 return 0;
46 }
47
pi3usb30532_sw_set(struct typec_switch * sw,enum typec_orientation orientation)48 static int pi3usb30532_sw_set(struct typec_switch *sw,
49 enum typec_orientation orientation)
50 {
51 struct pi3usb30532 *pi = typec_switch_get_drvdata(sw);
52 u8 new_conf;
53 int ret;
54
55 mutex_lock(&pi->lock);
56 new_conf = pi->conf;
57
58 switch (orientation) {
59 case TYPEC_ORIENTATION_NONE:
60 new_conf = PI3USB30532_CONF_OPEN;
61 break;
62 case TYPEC_ORIENTATION_NORMAL:
63 new_conf &= ~PI3USB30532_CONF_SWAP;
64 break;
65 case TYPEC_ORIENTATION_REVERSE:
66 new_conf |= PI3USB30532_CONF_SWAP;
67 break;
68 }
69
70 ret = pi3usb30532_set_conf(pi, new_conf);
71 mutex_unlock(&pi->lock);
72
73 return ret;
74 }
75
pi3usb30532_mux_set(struct typec_mux * mux,int state)76 static int pi3usb30532_mux_set(struct typec_mux *mux, int state)
77 {
78 struct pi3usb30532 *pi = typec_mux_get_drvdata(mux);
79 u8 new_conf;
80 int ret;
81
82 mutex_lock(&pi->lock);
83 new_conf = pi->conf;
84
85 switch (state) {
86 case TYPEC_STATE_SAFE:
87 new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
88 PI3USB30532_CONF_OPEN;
89 break;
90 case TYPEC_STATE_USB:
91 new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
92 PI3USB30532_CONF_USB3;
93 break;
94 case TYPEC_DP_STATE_C:
95 case TYPEC_DP_STATE_E:
96 new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
97 PI3USB30532_CONF_4LANE_DP;
98 break;
99 case TYPEC_DP_STATE_D:
100 new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
101 PI3USB30532_CONF_USB3_AND_2LANE_DP;
102 break;
103 default:
104 break;
105 }
106
107 ret = pi3usb30532_set_conf(pi, new_conf);
108 mutex_unlock(&pi->lock);
109
110 return ret;
111 }
112
pi3usb30532_probe(struct i2c_client * client)113 static int pi3usb30532_probe(struct i2c_client *client)
114 {
115 struct device *dev = &client->dev;
116 struct typec_switch_desc sw_desc;
117 struct typec_mux_desc mux_desc;
118 struct pi3usb30532 *pi;
119 int ret;
120
121 pi = devm_kzalloc(dev, sizeof(*pi), GFP_KERNEL);
122 if (!pi)
123 return -ENOMEM;
124
125 pi->client = client;
126 mutex_init(&pi->lock);
127
128 ret = i2c_smbus_read_byte_data(client, PI3USB30532_CONF);
129 if (ret < 0) {
130 dev_err(dev, "Error reading config register %d\n", ret);
131 return ret;
132 }
133 pi->conf = ret;
134
135 sw_desc.drvdata = pi;
136 sw_desc.fwnode = dev->fwnode;
137 sw_desc.set = pi3usb30532_sw_set;
138
139 pi->sw = typec_switch_register(dev, &sw_desc);
140 if (IS_ERR(pi->sw)) {
141 dev_err(dev, "Error registering typec switch: %ld\n",
142 PTR_ERR(pi->sw));
143 return PTR_ERR(pi->sw);
144 }
145
146 mux_desc.drvdata = pi;
147 mux_desc.fwnode = dev->fwnode;
148 mux_desc.set = pi3usb30532_mux_set;
149
150 pi->mux = typec_mux_register(dev, &mux_desc);
151 if (IS_ERR(pi->mux)) {
152 typec_switch_unregister(pi->sw);
153 dev_err(dev, "Error registering typec mux: %ld\n",
154 PTR_ERR(pi->mux));
155 return PTR_ERR(pi->mux);
156 }
157
158 i2c_set_clientdata(client, pi);
159 return 0;
160 }
161
pi3usb30532_remove(struct i2c_client * client)162 static int pi3usb30532_remove(struct i2c_client *client)
163 {
164 struct pi3usb30532 *pi = i2c_get_clientdata(client);
165
166 typec_mux_unregister(pi->mux);
167 typec_switch_unregister(pi->sw);
168 return 0;
169 }
170
171 static const struct i2c_device_id pi3usb30532_table[] = {
172 { "pi3usb30532" },
173 { }
174 };
175 MODULE_DEVICE_TABLE(i2c, pi3usb30532_table);
176
177 static struct i2c_driver pi3usb30532_driver = {
178 .driver = {
179 .name = "pi3usb30532",
180 },
181 .probe_new = pi3usb30532_probe,
182 .remove = pi3usb30532_remove,
183 .id_table = pi3usb30532_table,
184 };
185
186 module_i2c_driver(pi3usb30532_driver);
187
188 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
189 MODULE_DESCRIPTION("Pericom PI3USB30532 Type-C mux driver");
190 MODULE_LICENSE("GPL");
191
