1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Palmas USB transceiver driver
5 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Kishon Vijay Abraham I <kishon@ti.com>
8 * Based on twl6030_usb.c
9 * Author: Hema HK <hemahk@ti.com>
12 #include <linux/devm-helpers.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/mfd/palmas.h>
20 #include <linux/of_platform.h>
21 #include <linux/of_gpio.h>
22 #include <linux/gpio/consumer.h>
23 #include <linux/workqueue.h>
25 #define USB_GPIO_DEBOUNCE_MS 20 /* ms */
27 static const unsigned int palmas_extcon_cable
[] = {
33 static void palmas_usb_wakeup(struct palmas
*palmas
, int enable
)
36 palmas_write(palmas
, PALMAS_USB_OTG_BASE
, PALMAS_USB_WAKEUP
,
37 PALMAS_USB_WAKEUP_ID_WK_UP_COMP
);
39 palmas_write(palmas
, PALMAS_USB_OTG_BASE
, PALMAS_USB_WAKEUP
, 0);
42 static irqreturn_t
palmas_vbus_irq_handler(int irq
, void *_palmas_usb
)
44 struct palmas_usb
*palmas_usb
= _palmas_usb
;
45 struct extcon_dev
*edev
= palmas_usb
->edev
;
46 unsigned int vbus_line_state
;
48 palmas_read(palmas_usb
->palmas
, PALMAS_INTERRUPT_BASE
,
49 PALMAS_INT3_LINE_STATE
, &vbus_line_state
);
51 if (vbus_line_state
& PALMAS_INT3_LINE_STATE_VBUS
) {
52 if (palmas_usb
->linkstat
!= PALMAS_USB_STATE_VBUS
) {
53 palmas_usb
->linkstat
= PALMAS_USB_STATE_VBUS
;
54 extcon_set_state_sync(edev
, EXTCON_USB
, true);
55 dev_dbg(palmas_usb
->dev
, "USB cable is attached\n");
57 dev_dbg(palmas_usb
->dev
,
58 "Spurious connect event detected\n");
60 } else if (!(vbus_line_state
& PALMAS_INT3_LINE_STATE_VBUS
)) {
61 if (palmas_usb
->linkstat
== PALMAS_USB_STATE_VBUS
) {
62 palmas_usb
->linkstat
= PALMAS_USB_STATE_DISCONNECT
;
63 extcon_set_state_sync(edev
, EXTCON_USB
, false);
64 dev_dbg(palmas_usb
->dev
, "USB cable is detached\n");
66 dev_dbg(palmas_usb
->dev
,
67 "Spurious disconnect event detected\n");
74 static irqreturn_t
palmas_id_irq_handler(int irq
, void *_palmas_usb
)
76 unsigned int set
, id_src
;
77 struct palmas_usb
*palmas_usb
= _palmas_usb
;
78 struct extcon_dev
*edev
= palmas_usb
->edev
;
80 palmas_read(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
81 PALMAS_USB_ID_INT_LATCH_SET
, &set
);
82 palmas_read(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
83 PALMAS_USB_ID_INT_SRC
, &id_src
);
85 if ((set
& PALMAS_USB_ID_INT_SRC_ID_GND
) &&
86 (id_src
& PALMAS_USB_ID_INT_SRC_ID_GND
)) {
87 palmas_write(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
88 PALMAS_USB_ID_INT_LATCH_CLR
,
89 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND
);
90 palmas_usb
->linkstat
= PALMAS_USB_STATE_ID
;
91 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, true);
92 dev_dbg(palmas_usb
->dev
, "USB-HOST cable is attached\n");
93 } else if ((set
& PALMAS_USB_ID_INT_SRC_ID_FLOAT
) &&
94 (id_src
& PALMAS_USB_ID_INT_SRC_ID_FLOAT
)) {
95 palmas_write(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
96 PALMAS_USB_ID_INT_LATCH_CLR
,
97 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT
);
98 palmas_usb
->linkstat
= PALMAS_USB_STATE_DISCONNECT
;
99 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, false);
100 dev_dbg(palmas_usb
->dev
, "USB-HOST cable is detached\n");
101 } else if ((palmas_usb
->linkstat
== PALMAS_USB_STATE_ID
) &&
102 (!(set
& PALMAS_USB_ID_INT_SRC_ID_GND
))) {
103 palmas_usb
->linkstat
= PALMAS_USB_STATE_DISCONNECT
;
104 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, false);
105 dev_dbg(palmas_usb
->dev
, "USB-HOST cable is detached\n");
106 } else if ((palmas_usb
->linkstat
== PALMAS_USB_STATE_DISCONNECT
) &&
107 (id_src
& PALMAS_USB_ID_INT_SRC_ID_GND
)) {
108 palmas_usb
->linkstat
= PALMAS_USB_STATE_ID
;
109 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, true);
110 dev_dbg(palmas_usb
->dev
, " USB-HOST cable is attached\n");
116 static void palmas_gpio_id_detect(struct work_struct
*work
)
119 struct palmas_usb
*palmas_usb
= container_of(to_delayed_work(work
),
122 struct extcon_dev
*edev
= palmas_usb
->edev
;
124 if (!palmas_usb
->id_gpiod
)
127 id
= gpiod_get_value_cansleep(palmas_usb
->id_gpiod
);
130 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, false);
131 dev_dbg(palmas_usb
->dev
, "USB-HOST cable is detached\n");
133 extcon_set_state_sync(edev
, EXTCON_USB_HOST
, true);
134 dev_dbg(palmas_usb
->dev
, "USB-HOST cable is attached\n");
138 static irqreturn_t
palmas_gpio_id_irq_handler(int irq
, void *_palmas_usb
)
140 struct palmas_usb
*palmas_usb
= _palmas_usb
;
142 queue_delayed_work(system_power_efficient_wq
, &palmas_usb
->wq_detectid
,
143 palmas_usb
->sw_debounce_jiffies
);
148 static void palmas_enable_irq(struct palmas_usb
*palmas_usb
)
150 palmas_write(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
151 PALMAS_USB_VBUS_CTRL_SET
,
152 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP
);
154 if (palmas_usb
->enable_id_detection
) {
155 palmas_write(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
156 PALMAS_USB_ID_CTRL_SET
,
157 PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP
);
159 palmas_write(palmas_usb
->palmas
, PALMAS_USB_OTG_BASE
,
160 PALMAS_USB_ID_INT_EN_HI_SET
,
161 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND
|
162 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT
);
165 if (palmas_usb
->enable_vbus_detection
)
166 palmas_vbus_irq_handler(palmas_usb
->vbus_irq
, palmas_usb
);
168 /* cold plug for host mode needs this delay */
169 if (palmas_usb
->enable_id_detection
) {
171 palmas_id_irq_handler(palmas_usb
->id_irq
, palmas_usb
);
175 static int palmas_usb_probe(struct platform_device
*pdev
)
177 struct palmas
*palmas
= dev_get_drvdata(pdev
->dev
.parent
);
178 struct palmas_usb_platform_data
*pdata
= dev_get_platdata(&pdev
->dev
);
179 struct device_node
*node
= pdev
->dev
.of_node
;
180 struct palmas_usb
*palmas_usb
;
184 dev_err(&pdev
->dev
, "failed to get valid parent\n");
188 palmas_usb
= devm_kzalloc(&pdev
->dev
, sizeof(*palmas_usb
), GFP_KERNEL
);
192 if (node
&& !pdata
) {
193 palmas_usb
->wakeup
= of_property_read_bool(node
, "ti,wakeup");
194 palmas_usb
->enable_id_detection
= of_property_read_bool(node
,
195 "ti,enable-id-detection");
196 palmas_usb
->enable_vbus_detection
= of_property_read_bool(node
,
197 "ti,enable-vbus-detection");
199 palmas_usb
->wakeup
= true;
200 palmas_usb
->enable_id_detection
= true;
201 palmas_usb
->enable_vbus_detection
= true;
204 palmas_usb
->wakeup
= pdata
->wakeup
;
207 palmas_usb
->id_gpiod
= devm_gpiod_get_optional(&pdev
->dev
, "id",
209 if (IS_ERR(palmas_usb
->id_gpiod
))
210 return dev_err_probe(&pdev
->dev
, PTR_ERR(palmas_usb
->id_gpiod
),
211 "failed to get id gpio\n");
213 palmas_usb
->vbus_gpiod
= devm_gpiod_get_optional(&pdev
->dev
, "vbus",
215 if (IS_ERR(palmas_usb
->vbus_gpiod
))
216 return dev_err_probe(&pdev
->dev
, PTR_ERR(palmas_usb
->vbus_gpiod
),
217 "failed to get id gpio\n");
219 if (palmas_usb
->enable_id_detection
&& palmas_usb
->id_gpiod
) {
220 palmas_usb
->enable_id_detection
= false;
221 palmas_usb
->enable_gpio_id_detection
= true;
224 if (palmas_usb
->enable_vbus_detection
&& palmas_usb
->vbus_gpiod
) {
225 palmas_usb
->enable_vbus_detection
= false;
226 palmas_usb
->enable_gpio_vbus_detection
= true;
229 if (palmas_usb
->enable_gpio_id_detection
) {
232 if (of_property_read_u32(node
, "debounce-delay-ms", &debounce
))
233 debounce
= USB_GPIO_DEBOUNCE_MS
;
235 status
= gpiod_set_debounce(palmas_usb
->id_gpiod
,
238 palmas_usb
->sw_debounce_jiffies
= msecs_to_jiffies(debounce
);
241 status
= devm_delayed_work_autocancel(&pdev
->dev
,
242 &palmas_usb
->wq_detectid
,
243 palmas_gpio_id_detect
);
247 palmas
->usb
= palmas_usb
;
248 palmas_usb
->palmas
= palmas
;
250 palmas_usb
->dev
= &pdev
->dev
;
252 palmas_usb_wakeup(palmas
, palmas_usb
->wakeup
);
254 platform_set_drvdata(pdev
, palmas_usb
);
256 palmas_usb
->edev
= devm_extcon_dev_allocate(&pdev
->dev
,
257 palmas_extcon_cable
);
258 if (IS_ERR(palmas_usb
->edev
)) {
259 dev_err(&pdev
->dev
, "failed to allocate extcon device\n");
263 status
= devm_extcon_dev_register(&pdev
->dev
, palmas_usb
->edev
);
265 dev_err(&pdev
->dev
, "failed to register extcon device\n");
269 if (palmas_usb
->enable_id_detection
) {
270 palmas_usb
->id_otg_irq
= regmap_irq_get_virq(palmas
->irq_data
,
272 palmas_usb
->id_irq
= regmap_irq_get_virq(palmas
->irq_data
,
274 status
= devm_request_threaded_irq(palmas_usb
->dev
,
276 NULL
, palmas_id_irq_handler
,
277 IRQF_TRIGGER_FALLING
| IRQF_TRIGGER_RISING
|
279 "palmas_usb_id", palmas_usb
);
281 dev_err(&pdev
->dev
, "can't get IRQ %d, err %d\n",
282 palmas_usb
->id_irq
, status
);
285 } else if (palmas_usb
->enable_gpio_id_detection
) {
286 palmas_usb
->gpio_id_irq
= gpiod_to_irq(palmas_usb
->id_gpiod
);
287 if (palmas_usb
->gpio_id_irq
< 0) {
288 dev_err(&pdev
->dev
, "failed to get id irq\n");
289 return palmas_usb
->gpio_id_irq
;
291 status
= devm_request_threaded_irq(&pdev
->dev
,
292 palmas_usb
->gpio_id_irq
,
294 palmas_gpio_id_irq_handler
,
295 IRQF_TRIGGER_RISING
|
296 IRQF_TRIGGER_FALLING
|
302 "failed to request handler for id irq\n");
307 if (palmas_usb
->enable_vbus_detection
) {
308 palmas_usb
->vbus_otg_irq
= regmap_irq_get_virq(palmas
->irq_data
,
309 PALMAS_VBUS_OTG_IRQ
);
310 palmas_usb
->vbus_irq
= regmap_irq_get_virq(palmas
->irq_data
,
312 status
= devm_request_threaded_irq(palmas_usb
->dev
,
313 palmas_usb
->vbus_irq
, NULL
,
314 palmas_vbus_irq_handler
,
315 IRQF_TRIGGER_FALLING
| IRQF_TRIGGER_RISING
|
317 "palmas_usb_vbus", palmas_usb
);
319 dev_err(&pdev
->dev
, "can't get IRQ %d, err %d\n",
320 palmas_usb
->vbus_irq
, status
);
323 } else if (palmas_usb
->enable_gpio_vbus_detection
) {
324 /* remux GPIO_1 as VBUSDET */
325 status
= palmas_update_bits(palmas
,
326 PALMAS_PU_PD_OD_BASE
,
327 PALMAS_PRIMARY_SECONDARY_PAD1
,
328 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK
,
329 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT
));
331 dev_err(&pdev
->dev
, "can't remux GPIO1\n");
335 palmas_usb
->vbus_otg_irq
= regmap_irq_get_virq(palmas
->irq_data
,
336 PALMAS_VBUS_OTG_IRQ
);
337 palmas_usb
->gpio_vbus_irq
= gpiod_to_irq(palmas_usb
->vbus_gpiod
);
338 if (palmas_usb
->gpio_vbus_irq
< 0) {
339 dev_err(&pdev
->dev
, "failed to get vbus irq\n");
340 return palmas_usb
->gpio_vbus_irq
;
342 status
= devm_request_threaded_irq(&pdev
->dev
,
343 palmas_usb
->gpio_vbus_irq
,
345 palmas_vbus_irq_handler
,
346 IRQF_TRIGGER_FALLING
|
347 IRQF_TRIGGER_RISING
|
353 "failed to request handler for vbus irq\n");
358 palmas_enable_irq(palmas_usb
);
359 /* perform initial detection */
360 if (palmas_usb
->enable_gpio_vbus_detection
)
361 palmas_vbus_irq_handler(palmas_usb
->gpio_vbus_irq
, palmas_usb
);
362 palmas_gpio_id_detect(&palmas_usb
->wq_detectid
.work
);
363 device_set_wakeup_capable(&pdev
->dev
, true);
367 #ifdef CONFIG_PM_SLEEP
368 static int palmas_usb_suspend(struct device
*dev
)
370 struct palmas_usb
*palmas_usb
= dev_get_drvdata(dev
);
372 if (device_may_wakeup(dev
)) {
373 if (palmas_usb
->enable_vbus_detection
)
374 enable_irq_wake(palmas_usb
->vbus_irq
);
375 if (palmas_usb
->enable_gpio_vbus_detection
)
376 enable_irq_wake(palmas_usb
->gpio_vbus_irq
);
377 if (palmas_usb
->enable_id_detection
)
378 enable_irq_wake(palmas_usb
->id_irq
);
379 if (palmas_usb
->enable_gpio_id_detection
)
380 enable_irq_wake(palmas_usb
->gpio_id_irq
);
385 static int palmas_usb_resume(struct device
*dev
)
387 struct palmas_usb
*palmas_usb
= dev_get_drvdata(dev
);
389 if (device_may_wakeup(dev
)) {
390 if (palmas_usb
->enable_vbus_detection
)
391 disable_irq_wake(palmas_usb
->vbus_irq
);
392 if (palmas_usb
->enable_gpio_vbus_detection
)
393 disable_irq_wake(palmas_usb
->gpio_vbus_irq
);
394 if (palmas_usb
->enable_id_detection
)
395 disable_irq_wake(palmas_usb
->id_irq
);
396 if (palmas_usb
->enable_gpio_id_detection
)
397 disable_irq_wake(palmas_usb
->gpio_id_irq
);
400 /* check if GPIO states changed while suspend/resume */
401 if (palmas_usb
->enable_gpio_vbus_detection
)
402 palmas_vbus_irq_handler(palmas_usb
->gpio_vbus_irq
, palmas_usb
);
403 palmas_gpio_id_detect(&palmas_usb
->wq_detectid
.work
);
409 static SIMPLE_DEV_PM_OPS(palmas_pm_ops
, palmas_usb_suspend
, palmas_usb_resume
);
411 static const struct of_device_id of_palmas_match_tbl
[] = {
412 { .compatible
= "ti,palmas-usb", },
413 { .compatible
= "ti,palmas-usb-vid", },
414 { .compatible
= "ti,twl6035-usb", },
415 { .compatible
= "ti,twl6035-usb-vid", },
419 static struct platform_driver palmas_usb_driver
= {
420 .probe
= palmas_usb_probe
,
422 .name
= "palmas-usb",
423 .of_match_table
= of_palmas_match_tbl
,
424 .pm
= &palmas_pm_ops
,
428 module_platform_driver(palmas_usb_driver
);
430 MODULE_ALIAS("platform:palmas-usb");
431 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
432 MODULE_DESCRIPTION("Palmas USB transceiver driver");
433 MODULE_LICENSE("GPL");
434 MODULE_DEVICE_TABLE(of
, of_palmas_match_tbl
);