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Commit | Line | Data |
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6a099c63 DK |
1 | /* |
2 | * Driver for SMSC USB3503 USB 2.0 hub controller driver | |
3 | * | |
4 | * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/i2c.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/module.h> | |
eab8050c | 26 | #include <linux/of_gpio.h> |
6a099c63 DK |
27 | #include <linux/platform_device.h> |
28 | #include <linux/platform_data/usb3503.h> | |
68b14134 | 29 | #include <linux/regmap.h> |
6a099c63 DK |
30 | |
31 | #define USB3503_VIDL 0x00 | |
32 | #define USB3503_VIDM 0x01 | |
33 | #define USB3503_PIDL 0x02 | |
34 | #define USB3503_PIDM 0x03 | |
35 | #define USB3503_DIDL 0x04 | |
36 | #define USB3503_DIDM 0x05 | |
37 | ||
38 | #define USB3503_CFG1 0x06 | |
39 | #define USB3503_SELF_BUS_PWR (1 << 7) | |
40 | ||
41 | #define USB3503_CFG2 0x07 | |
42 | #define USB3503_CFG3 0x08 | |
43 | #define USB3503_NRD 0x09 | |
44 | ||
45 | #define USB3503_PDS 0x0a | |
6a099c63 DK |
46 | |
47 | #define USB3503_SP_ILOCK 0xe7 | |
48 | #define USB3503_SPILOCK_CONNECT (1 << 1) | |
49 | #define USB3503_SPILOCK_CONFIG (1 << 0) | |
50 | ||
51 | #define USB3503_CFGP 0xee | |
52 | #define USB3503_CLKSUSP (1 << 7) | |
53 | ||
68b14134 MB |
54 | #define USB3503_RESET 0xff |
55 | ||
6a099c63 DK |
56 | struct usb3503 { |
57 | enum usb3503_mode mode; | |
68b14134 MB |
58 | struct regmap *regmap; |
59 | struct device *dev; | |
e8e44a48 | 60 | u8 port_off_mask; |
6a099c63 DK |
61 | int gpio_intn; |
62 | int gpio_reset; | |
63 | int gpio_connect; | |
64 | }; | |
65 | ||
8e7245b8 | 66 | static int usb3503_reset(struct usb3503 *hub, int state) |
6a099c63 | 67 | { |
8e7245b8 MB |
68 | if (!state && gpio_is_valid(hub->gpio_connect)) |
69 | gpio_set_value_cansleep(hub->gpio_connect, 0); | |
70 | ||
71 | if (gpio_is_valid(hub->gpio_reset)) | |
72 | gpio_set_value_cansleep(hub->gpio_reset, state); | |
6a099c63 | 73 | |
06a962fa | 74 | /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ |
6a099c63 | 75 | if (state) |
06a962fa | 76 | usleep_range(4000, 10000); |
6a099c63 DK |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) | |
82 | { | |
68b14134 | 83 | struct device *dev = hub->dev; |
6a099c63 DK |
84 | int err = 0; |
85 | ||
86 | switch (mode) { | |
87 | case USB3503_MODE_HUB: | |
8e7245b8 | 88 | usb3503_reset(hub, 1); |
6a099c63 DK |
89 | |
90 | /* SP_ILOCK: set connect_n, config_n for config */ | |
68b14134 | 91 | err = regmap_write(hub->regmap, USB3503_SP_ILOCK, |
6a099c63 DK |
92 | (USB3503_SPILOCK_CONNECT |
93 | | USB3503_SPILOCK_CONFIG)); | |
94 | if (err < 0) { | |
68b14134 | 95 | dev_err(dev, "SP_ILOCK failed (%d)\n", err); |
6a099c63 DK |
96 | goto err_hubmode; |
97 | } | |
98 | ||
e8e44a48 DK |
99 | /* PDS : Disable For Self Powered Operation */ |
100 | if (hub->port_off_mask) { | |
68b14134 MB |
101 | err = regmap_update_bits(hub->regmap, USB3503_PDS, |
102 | hub->port_off_mask, | |
e8e44a48 DK |
103 | hub->port_off_mask); |
104 | if (err < 0) { | |
68b14134 | 105 | dev_err(dev, "PDS failed (%d)\n", err); |
e8e44a48 DK |
106 | goto err_hubmode; |
107 | } | |
6a099c63 DK |
108 | } |
109 | ||
110 | /* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */ | |
68b14134 MB |
111 | err = regmap_update_bits(hub->regmap, USB3503_CFG1, |
112 | USB3503_SELF_BUS_PWR, | |
113 | USB3503_SELF_BUS_PWR); | |
6a099c63 | 114 | if (err < 0) { |
68b14134 | 115 | dev_err(dev, "CFG1 failed (%d)\n", err); |
6a099c63 DK |
116 | goto err_hubmode; |
117 | } | |
118 | ||
119 | /* SP_LOCK: clear connect_n, config_n for hub connect */ | |
68b14134 MB |
120 | err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK, |
121 | (USB3503_SPILOCK_CONNECT | |
122 | | USB3503_SPILOCK_CONFIG), 0); | |
6a099c63 | 123 | if (err < 0) { |
68b14134 | 124 | dev_err(dev, "SP_ILOCK failed (%d)\n", err); |
6a099c63 DK |
125 | goto err_hubmode; |
126 | } | |
127 | ||
8e7245b8 MB |
128 | if (gpio_is_valid(hub->gpio_connect)) |
129 | gpio_set_value_cansleep(hub->gpio_connect, 1); | |
130 | ||
6a099c63 | 131 | hub->mode = mode; |
68b14134 | 132 | dev_info(dev, "switched to HUB mode\n"); |
6a099c63 DK |
133 | break; |
134 | ||
135 | case USB3503_MODE_STANDBY: | |
8e7245b8 | 136 | usb3503_reset(hub, 0); |
6a099c63 DK |
137 | |
138 | hub->mode = mode; | |
68b14134 | 139 | dev_info(dev, "switched to STANDBY mode\n"); |
6a099c63 DK |
140 | break; |
141 | ||
142 | default: | |
dd8e670d | 143 | dev_err(dev, "unknown mode is requested\n"); |
6a099c63 DK |
144 | err = -EINVAL; |
145 | break; | |
146 | } | |
147 | ||
148 | err_hubmode: | |
149 | return err; | |
150 | } | |
151 | ||
68b14134 MB |
152 | static const struct regmap_config usb3503_regmap_config = { |
153 | .reg_bits = 8, | |
154 | .val_bits = 8, | |
155 | ||
156 | .max_register = USB3503_RESET, | |
157 | }; | |
158 | ||
2487e3ee | 159 | static int usb3503_probe(struct usb3503 *hub) |
6a099c63 | 160 | { |
2487e3ee MB |
161 | struct device *dev = hub->dev; |
162 | struct usb3503_platform_data *pdata = dev_get_platdata(dev); | |
163 | struct device_node *np = dev->of_node; | |
164 | int err; | |
e5a0c874 | 165 | u32 mode = USB3503_MODE_HUB; |
e8b58b49 DK |
166 | const u32 *property; |
167 | int len; | |
6a099c63 | 168 | |
eab8050c | 169 | if (pdata) { |
e8e44a48 | 170 | hub->port_off_mask = pdata->port_off_mask; |
6a099c63 DK |
171 | hub->gpio_intn = pdata->gpio_intn; |
172 | hub->gpio_connect = pdata->gpio_connect; | |
173 | hub->gpio_reset = pdata->gpio_reset; | |
174 | hub->mode = pdata->initial_mode; | |
eab8050c | 175 | } else if (np) { |
e8b58b49 DK |
176 | hub->port_off_mask = 0; |
177 | ||
178 | property = of_get_property(np, "disabled-ports", &len); | |
179 | if (property && (len / sizeof(u32)) > 0) { | |
180 | int i; | |
181 | for (i = 0; i < len / sizeof(u32); i++) { | |
182 | u32 port = be32_to_cpu(property[i]); | |
183 | if ((1 <= port) && (port <= 3)) | |
184 | hub->port_off_mask |= (1 << port); | |
185 | } | |
186 | } | |
187 | ||
42416cc8 | 188 | hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0); |
eab8050c DK |
189 | if (hub->gpio_intn == -EPROBE_DEFER) |
190 | return -EPROBE_DEFER; | |
42416cc8 | 191 | hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0); |
eab8050c DK |
192 | if (hub->gpio_connect == -EPROBE_DEFER) |
193 | return -EPROBE_DEFER; | |
ccf92c94 | 194 | hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); |
eab8050c DK |
195 | if (hub->gpio_reset == -EPROBE_DEFER) |
196 | return -EPROBE_DEFER; | |
197 | of_property_read_u32(np, "initial-mode", &mode); | |
198 | hub->mode = mode; | |
6a099c63 DK |
199 | } |
200 | ||
201 | if (gpio_is_valid(hub->gpio_intn)) { | |
2487e3ee | 202 | err = devm_gpio_request_one(dev, hub->gpio_intn, |
6a099c63 DK |
203 | GPIOF_OUT_INIT_HIGH, "usb3503 intn"); |
204 | if (err) { | |
2487e3ee MB |
205 | dev_err(dev, |
206 | "unable to request GPIO %d as connect pin (%d)\n", | |
207 | hub->gpio_intn, err); | |
cffedd67 | 208 | return err; |
6a099c63 DK |
209 | } |
210 | } | |
211 | ||
212 | if (gpio_is_valid(hub->gpio_connect)) { | |
2487e3ee | 213 | err = devm_gpio_request_one(dev, hub->gpio_connect, |
8e7245b8 | 214 | GPIOF_OUT_INIT_LOW, "usb3503 connect"); |
6a099c63 | 215 | if (err) { |
2487e3ee MB |
216 | dev_err(dev, |
217 | "unable to request GPIO %d as connect pin (%d)\n", | |
218 | hub->gpio_connect, err); | |
cffedd67 | 219 | return err; |
6a099c63 DK |
220 | } |
221 | } | |
222 | ||
223 | if (gpio_is_valid(hub->gpio_reset)) { | |
2487e3ee | 224 | err = devm_gpio_request_one(dev, hub->gpio_reset, |
6a099c63 DK |
225 | GPIOF_OUT_INIT_LOW, "usb3503 reset"); |
226 | if (err) { | |
2487e3ee MB |
227 | dev_err(dev, |
228 | "unable to request GPIO %d as reset pin (%d)\n", | |
229 | hub->gpio_reset, err); | |
cffedd67 | 230 | return err; |
6a099c63 DK |
231 | } |
232 | } | |
233 | ||
eab8050c | 234 | usb3503_switch_mode(hub, hub->mode); |
6a099c63 | 235 | |
dd8e670d | 236 | dev_info(dev, "%s: probed in %s mode\n", __func__, |
6a099c63 DK |
237 | (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby"); |
238 | ||
239 | return 0; | |
6a099c63 DK |
240 | } |
241 | ||
2487e3ee MB |
242 | static int usb3503_i2c_probe(struct i2c_client *i2c, |
243 | const struct i2c_device_id *id) | |
244 | { | |
245 | struct usb3503 *hub; | |
246 | int err; | |
247 | ||
248 | hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL); | |
249 | if (!hub) { | |
250 | dev_err(&i2c->dev, "private data alloc fail\n"); | |
251 | return -ENOMEM; | |
252 | } | |
253 | ||
254 | i2c_set_clientdata(i2c, hub); | |
255 | hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config); | |
256 | if (IS_ERR(hub->regmap)) { | |
257 | err = PTR_ERR(hub->regmap); | |
258 | dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err); | |
259 | return err; | |
260 | } | |
261 | hub->dev = &i2c->dev; | |
262 | ||
263 | return usb3503_probe(hub); | |
264 | } | |
265 | ||
6a099c63 DK |
266 | static const struct i2c_device_id usb3503_id[] = { |
267 | { USB3503_I2C_NAME, 0 }, | |
268 | { } | |
269 | }; | |
270 | MODULE_DEVICE_TABLE(i2c, usb3503_id); | |
271 | ||
eab8050c DK |
272 | #ifdef CONFIG_OF |
273 | static const struct of_device_id usb3503_of_match[] = { | |
274 | { .compatible = "smsc,usb3503", }, | |
275 | {}, | |
276 | }; | |
277 | MODULE_DEVICE_TABLE(of, usb3503_of_match); | |
278 | #endif | |
279 | ||
6a099c63 DK |
280 | static struct i2c_driver usb3503_driver = { |
281 | .driver = { | |
282 | .name = USB3503_I2C_NAME, | |
eab8050c | 283 | .of_match_table = of_match_ptr(usb3503_of_match), |
6a099c63 | 284 | }, |
2487e3ee | 285 | .probe = usb3503_i2c_probe, |
6a099c63 DK |
286 | .id_table = usb3503_id, |
287 | }; | |
288 | ||
8244ac04 | 289 | module_i2c_driver(usb3503_driver); |
6a099c63 DK |
290 | |
291 | MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>"); | |
292 | MODULE_DESCRIPTION("USB3503 USB HUB driver"); | |
293 | MODULE_LICENSE("GPL"); |