This source file includes following definitions.
- twl6030_writeb
- twl6030_readb
- twl6030_start_srp
- twl6030_usb_ldo_init
- vbus_show
- twl6030_usb_irq
- twl6030_usbotg_irq
- twl6030_status_work
- twl6030_enable_irq
- otg_set_vbus_work
- twl6030_set_vbus
- twl6030_usb_probe
- twl6030_usb_remove
- twl6030_usb_init
- twl6030_usb_exit
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10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/io.h>
15 #include <linux/usb/musb.h>
16 #include <linux/usb/phy_companion.h>
17 #include <linux/phy/omap_usb.h>
18 #include <linux/mfd/twl.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/err.h>
21 #include <linux/slab.h>
22 #include <linux/delay.h>
23 #include <linux/of.h>
24
25
26 #define USB_VENDOR_ID_LSB 0x00
27 #define USB_VENDOR_ID_MSB 0x01
28 #define USB_PRODUCT_ID_LSB 0x02
29 #define USB_PRODUCT_ID_MSB 0x03
30 #define USB_VBUS_CTRL_SET 0x04
31 #define USB_VBUS_CTRL_CLR 0x05
32 #define USB_ID_CTRL_SET 0x06
33 #define USB_ID_CTRL_CLR 0x07
34 #define USB_VBUS_INT_SRC 0x08
35 #define USB_VBUS_INT_LATCH_SET 0x09
36 #define USB_VBUS_INT_LATCH_CLR 0x0A
37 #define USB_VBUS_INT_EN_LO_SET 0x0B
38 #define USB_VBUS_INT_EN_LO_CLR 0x0C
39 #define USB_VBUS_INT_EN_HI_SET 0x0D
40 #define USB_VBUS_INT_EN_HI_CLR 0x0E
41 #define USB_ID_INT_SRC 0x0F
42 #define USB_ID_INT_LATCH_SET 0x10
43 #define USB_ID_INT_LATCH_CLR 0x11
44
45 #define USB_ID_INT_EN_LO_SET 0x12
46 #define USB_ID_INT_EN_LO_CLR 0x13
47 #define USB_ID_INT_EN_HI_SET 0x14
48 #define USB_ID_INT_EN_HI_CLR 0x15
49 #define USB_OTG_ADP_CTRL 0x16
50 #define USB_OTG_ADP_HIGH 0x17
51 #define USB_OTG_ADP_LOW 0x18
52 #define USB_OTG_ADP_RISE 0x19
53 #define USB_OTG_REVISION 0x1A
54
55
56 #define TWL6030_MISC2 0xE5
57 #define TWL6030_CFG_LDO_PD2 0xF5
58 #define TWL6030_BACKUP_REG 0xFA
59
60 #define STS_HW_CONDITIONS 0x21
61
62
63 #define STS_HW_CONDITIONS 0x21
64 #define STS_USB_ID BIT(2)
65
66
67 #define VUSB_CFG_TRANS 0x71
68 #define VUSB_CFG_STATE 0x72
69 #define VUSB_CFG_VOLTAGE 0x73
70
71
72
73 #define CHARGERUSB_CTRL1 0x8
74
75 #define CONTROLLER_STAT1 0x03
76 #define VBUS_DET BIT(2)
77
78 struct twl6030_usb {
79 struct phy_companion comparator;
80 struct device *dev;
81
82
83 spinlock_t lock;
84
85 struct regulator *usb3v3;
86
87
88 struct delayed_work get_status_work;
89
90
91 struct work_struct set_vbus_work;
92
93 int irq1;
94 int irq2;
95 enum musb_vbus_id_status linkstat;
96 u8 asleep;
97 bool vbus_enable;
98 };
99
100 #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
101
102
103
104 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
105 u8 data, u8 address)
106 {
107 int ret = 0;
108
109 ret = twl_i2c_write_u8(module, data, address);
110 if (ret < 0)
111 dev_err(twl->dev,
112 "Write[0x%x] Error %d\n", address, ret);
113 return ret;
114 }
115
116 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
117 {
118 u8 data;
119 int ret;
120
121 ret = twl_i2c_read_u8(module, &data, address);
122 if (ret >= 0)
123 ret = data;
124 else
125 dev_err(twl->dev,
126 "readb[0x%x,0x%x] Error %d\n",
127 module, address, ret);
128 return ret;
129 }
130
131 static int twl6030_start_srp(struct phy_companion *comparator)
132 {
133 struct twl6030_usb *twl = comparator_to_twl(comparator);
134
135 twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
136 twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
137
138 mdelay(100);
139 twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
140
141 return 0;
142 }
143
144 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
145 {
146
147 twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
148
149
150 twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
151
152
153 twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
154
155 twl->usb3v3 = regulator_get(twl->dev, "usb");
156 if (IS_ERR(twl->usb3v3))
157 return -ENODEV;
158
159
160 twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
161
162
163
164
165
166 twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
167
168 return 0;
169 }
170
171 static ssize_t vbus_show(struct device *dev,
172 struct device_attribute *attr, char *buf)
173 {
174 struct twl6030_usb *twl = dev_get_drvdata(dev);
175 unsigned long flags;
176 int ret = -EINVAL;
177
178 spin_lock_irqsave(&twl->lock, flags);
179
180 switch (twl->linkstat) {
181 case MUSB_VBUS_VALID:
182 ret = snprintf(buf, PAGE_SIZE, "vbus\n");
183 break;
184 case MUSB_ID_GROUND:
185 ret = snprintf(buf, PAGE_SIZE, "id\n");
186 break;
187 case MUSB_VBUS_OFF:
188 ret = snprintf(buf, PAGE_SIZE, "none\n");
189 break;
190 default:
191 ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
192 }
193 spin_unlock_irqrestore(&twl->lock, flags);
194
195 return ret;
196 }
197 static DEVICE_ATTR_RO(vbus);
198
199 static struct attribute *twl6030_attrs[] = {
200 &dev_attr_vbus.attr,
201 NULL,
202 };
203 ATTRIBUTE_GROUPS(twl6030);
204
205 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
206 {
207 struct twl6030_usb *twl = _twl;
208 enum musb_vbus_id_status status = MUSB_UNKNOWN;
209 u8 vbus_state, hw_state;
210 int ret;
211
212 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
213
214 vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
215 CONTROLLER_STAT1);
216 if (!(hw_state & STS_USB_ID)) {
217 if (vbus_state & VBUS_DET) {
218 ret = regulator_enable(twl->usb3v3);
219 if (ret)
220 dev_err(twl->dev, "Failed to enable usb3v3\n");
221
222 twl->asleep = 1;
223 status = MUSB_VBUS_VALID;
224 twl->linkstat = status;
225 ret = musb_mailbox(status);
226 if (ret)
227 twl->linkstat = MUSB_UNKNOWN;
228 } else {
229 if (twl->linkstat != MUSB_UNKNOWN) {
230 status = MUSB_VBUS_OFF;
231 twl->linkstat = status;
232 ret = musb_mailbox(status);
233 if (ret)
234 twl->linkstat = MUSB_UNKNOWN;
235 if (twl->asleep) {
236 regulator_disable(twl->usb3v3);
237 twl->asleep = 0;
238 }
239 }
240 }
241 }
242 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
243
244 return IRQ_HANDLED;
245 }
246
247 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
248 {
249 struct twl6030_usb *twl = _twl;
250 enum musb_vbus_id_status status = MUSB_UNKNOWN;
251 u8 hw_state;
252 int ret;
253
254 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
255
256 if (hw_state & STS_USB_ID) {
257 ret = regulator_enable(twl->usb3v3);
258 if (ret)
259 dev_err(twl->dev, "Failed to enable usb3v3\n");
260
261 twl->asleep = 1;
262 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
263 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
264 status = MUSB_ID_GROUND;
265 twl->linkstat = status;
266 ret = musb_mailbox(status);
267 if (ret)
268 twl->linkstat = MUSB_UNKNOWN;
269 } else {
270 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
271 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
272 }
273 twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
274
275 return IRQ_HANDLED;
276 }
277
278 static void twl6030_status_work(struct work_struct *work)
279 {
280 struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
281 get_status_work.work);
282
283 twl6030_usb_irq(twl->irq2, twl);
284 twl6030_usbotg_irq(twl->irq1, twl);
285 }
286
287 static int twl6030_enable_irq(struct twl6030_usb *twl)
288 {
289 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
290 twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
291 twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
292
293 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
294 REG_INT_MSK_LINE_C);
295 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
296 REG_INT_MSK_STS_C);
297
298 return 0;
299 }
300
301 static void otg_set_vbus_work(struct work_struct *data)
302 {
303 struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
304 set_vbus_work);
305
306
307
308
309
310
311 if (twl->vbus_enable)
312 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
313 CHARGERUSB_CTRL1);
314 else
315 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
316 CHARGERUSB_CTRL1);
317 }
318
319 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
320 {
321 struct twl6030_usb *twl = comparator_to_twl(comparator);
322
323 twl->vbus_enable = enabled;
324 schedule_work(&twl->set_vbus_work);
325
326 return 0;
327 }
328
329 static int twl6030_usb_probe(struct platform_device *pdev)
330 {
331 u32 ret;
332 struct twl6030_usb *twl;
333 int status, err;
334 struct device_node *np = pdev->dev.of_node;
335 struct device *dev = &pdev->dev;
336
337 if (!np) {
338 dev_err(dev, "no DT info\n");
339 return -EINVAL;
340 }
341
342 twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
343 if (!twl)
344 return -ENOMEM;
345
346 twl->dev = &pdev->dev;
347 twl->irq1 = platform_get_irq(pdev, 0);
348 twl->irq2 = platform_get_irq(pdev, 1);
349 twl->linkstat = MUSB_UNKNOWN;
350
351 twl->comparator.set_vbus = twl6030_set_vbus;
352 twl->comparator.start_srp = twl6030_start_srp;
353
354 ret = omap_usb2_set_comparator(&twl->comparator);
355 if (ret == -ENODEV) {
356 dev_info(&pdev->dev, "phy not ready, deferring probe");
357 return -EPROBE_DEFER;
358 }
359
360
361 spin_lock_init(&twl->lock);
362
363 err = twl6030_usb_ldo_init(twl);
364 if (err) {
365 dev_err(&pdev->dev, "ldo init failed\n");
366 return err;
367 }
368
369 platform_set_drvdata(pdev, twl);
370
371 INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
372 INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
373
374 status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
375 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
376 "twl6030_usb", twl);
377 if (status < 0) {
378 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
379 twl->irq1, status);
380 goto err_put_regulator;
381 }
382
383 status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
384 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
385 "twl6030_usb", twl);
386 if (status < 0) {
387 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
388 twl->irq2, status);
389 goto err_free_irq1;
390 }
391
392 twl->asleep = 0;
393 twl6030_enable_irq(twl);
394 schedule_delayed_work(&twl->get_status_work, HZ);
395 dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
396
397 return 0;
398
399 err_free_irq1:
400 free_irq(twl->irq1, twl);
401 err_put_regulator:
402 regulator_put(twl->usb3v3);
403
404 return status;
405 }
406
407 static int twl6030_usb_remove(struct platform_device *pdev)
408 {
409 struct twl6030_usb *twl = platform_get_drvdata(pdev);
410
411 cancel_delayed_work_sync(&twl->get_status_work);
412 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
413 REG_INT_MSK_LINE_C);
414 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
415 REG_INT_MSK_STS_C);
416 free_irq(twl->irq1, twl);
417 free_irq(twl->irq2, twl);
418 regulator_put(twl->usb3v3);
419 cancel_work_sync(&twl->set_vbus_work);
420
421 return 0;
422 }
423
424 static const struct of_device_id twl6030_usb_id_table[] = {
425 { .compatible = "ti,twl6030-usb" },
426 {}
427 };
428 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
429
430 static struct platform_driver twl6030_usb_driver = {
431 .probe = twl6030_usb_probe,
432 .remove = twl6030_usb_remove,
433 .driver = {
434 .name = "twl6030_usb",
435 .of_match_table = of_match_ptr(twl6030_usb_id_table),
436 .dev_groups = twl6030_groups,
437 },
438 };
439
440 static int __init twl6030_usb_init(void)
441 {
442 return platform_driver_register(&twl6030_usb_driver);
443 }
444 subsys_initcall(twl6030_usb_init);
445
446 static void __exit twl6030_usb_exit(void)
447 {
448 platform_driver_unregister(&twl6030_usb_driver);
449 }
450 module_exit(twl6030_usb_exit);
451
452 MODULE_ALIAS("platform:twl6030_usb");
453 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
454 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
455 MODULE_LICENSE("GPL");