2 * AXP20x PMIC USB power supply status driver
4 * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
5 * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
13 #include <linux/bitops.h>
14 #include <linux/device.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/mfd/axp20x.h>
19 #include <linux/module.h>
21 #include <linux/of_device.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/regmap.h>
25 #include <linux/slab.h>
26 #include <linux/iio/consumer.h>
27 #include <linux/workqueue.h>
29 #define DRVNAME "axp20x-usb-power-supply"
31 #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
32 #define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
34 #define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
36 #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
37 #define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
38 #define AXP20X_VBUS_VHOLD_OFFSET 3
39 #define AXP20X_VBUS_CLIMIT_MASK 3
40 #define AXP20X_VBUS_CLIMIT_900mA 0
41 #define AXP20X_VBUS_CLIMIT_500mA 1
42 #define AXP20X_VBUS_CLIMIT_100mA 2
43 #define AXP20X_VBUS_CLIMIT_NONE 3
45 #define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
46 #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
48 #define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
51 * Note do not raise the debounce time, we must report Vusb high within
52 * 100ms otherwise we get Vbus errors in musb.
54 #define DEBOUNCE_TIME msecs_to_jiffies(50)
56 struct axp20x_usb_power
{
57 struct device_node
*np
;
58 struct regmap
*regmap
;
59 struct power_supply
*supply
;
60 enum axp20x_variants axp20x_id
;
61 struct iio_channel
*vbus_v
;
62 struct iio_channel
*vbus_i
;
63 struct delayed_work vbus_detect
;
64 unsigned int old_status
;
67 static irqreturn_t
axp20x_usb_power_irq(int irq
, void *devid
)
69 struct axp20x_usb_power
*power
= devid
;
71 power_supply_changed(power
->supply
);
76 static void axp20x_usb_power_poll_vbus(struct work_struct
*work
)
78 struct axp20x_usb_power
*power
=
79 container_of(work
, struct axp20x_usb_power
, vbus_detect
.work
);
83 ret
= regmap_read(power
->regmap
, AXP20X_PWR_INPUT_STATUS
, &val
);
87 val
&= (AXP20X_PWR_STATUS_VBUS_PRESENT
| AXP20X_PWR_STATUS_VBUS_USED
);
88 if (val
!= power
->old_status
)
89 power_supply_changed(power
->supply
);
91 power
->old_status
= val
;
94 mod_delayed_work(system_wq
, &power
->vbus_detect
, DEBOUNCE_TIME
);
97 static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power
*power
)
99 if (power
->axp20x_id
>= AXP221_ID
)
105 static int axp20x_usb_power_get_property(struct power_supply
*psy
,
106 enum power_supply_property psp
, union power_supply_propval
*val
)
108 struct axp20x_usb_power
*power
= power_supply_get_drvdata(psy
);
109 unsigned int input
, v
;
113 case POWER_SUPPLY_PROP_VOLTAGE_MIN
:
114 ret
= regmap_read(power
->regmap
, AXP20X_VBUS_IPSOUT_MGMT
, &v
);
118 val
->intval
= AXP20X_VBUS_VHOLD_uV(v
);
120 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
121 if (IS_ENABLED(CONFIG_AXP20X_ADC
)) {
122 ret
= iio_read_channel_processed(power
->vbus_v
,
128 * IIO framework gives mV but Power Supply framework
135 ret
= axp20x_read_variable_width(power
->regmap
,
136 AXP20X_VBUS_V_ADC_H
, 12);
140 val
->intval
= ret
* 1700; /* 1 step = 1.7 mV */
142 case POWER_SUPPLY_PROP_CURRENT_MAX
:
143 ret
= regmap_read(power
->regmap
, AXP20X_VBUS_IPSOUT_MGMT
, &v
);
147 switch (v
& AXP20X_VBUS_CLIMIT_MASK
) {
148 case AXP20X_VBUS_CLIMIT_100mA
:
149 if (power
->axp20x_id
== AXP221_ID
)
150 val
->intval
= -1; /* No 100mA limit */
152 val
->intval
= 100000;
154 case AXP20X_VBUS_CLIMIT_500mA
:
155 val
->intval
= 500000;
157 case AXP20X_VBUS_CLIMIT_900mA
:
158 val
->intval
= 900000;
160 case AXP20X_VBUS_CLIMIT_NONE
:
165 case POWER_SUPPLY_PROP_CURRENT_NOW
:
166 if (IS_ENABLED(CONFIG_AXP20X_ADC
)) {
167 ret
= iio_read_channel_processed(power
->vbus_i
,
173 * IIO framework gives mA but Power Supply framework
180 ret
= axp20x_read_variable_width(power
->regmap
,
181 AXP20X_VBUS_I_ADC_H
, 12);
185 val
->intval
= ret
* 375; /* 1 step = 0.375 mA */
191 /* All the properties below need the input-status reg value */
192 ret
= regmap_read(power
->regmap
, AXP20X_PWR_INPUT_STATUS
, &input
);
197 case POWER_SUPPLY_PROP_HEALTH
:
198 if (!(input
& AXP20X_PWR_STATUS_VBUS_PRESENT
)) {
199 val
->intval
= POWER_SUPPLY_HEALTH_UNKNOWN
;
203 val
->intval
= POWER_SUPPLY_HEALTH_GOOD
;
205 if (power
->axp20x_id
== AXP202_ID
) {
206 ret
= regmap_read(power
->regmap
,
207 AXP20X_USB_OTG_STATUS
, &v
);
211 if (!(v
& AXP20X_USB_STATUS_VBUS_VALID
))
213 POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
;
216 case POWER_SUPPLY_PROP_PRESENT
:
217 val
->intval
= !!(input
& AXP20X_PWR_STATUS_VBUS_PRESENT
);
219 case POWER_SUPPLY_PROP_ONLINE
:
220 val
->intval
= !!(input
& AXP20X_PWR_STATUS_VBUS_USED
);
229 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power
*power
,
243 val
= (intval
- 4000000) / 100000;
244 return regmap_update_bits(power
->regmap
,
245 AXP20X_VBUS_IPSOUT_MGMT
,
246 AXP20X_VBUS_VHOLD_MASK
,
247 val
<< AXP20X_VBUS_VHOLD_OFFSET
);
255 static int axp20x_usb_power_set_current_max(struct axp20x_usb_power
*power
,
262 if (power
->axp20x_id
== AXP221_ID
)
267 val
= (900000 - intval
) / 400000;
268 return regmap_update_bits(power
->regmap
,
269 AXP20X_VBUS_IPSOUT_MGMT
,
270 AXP20X_VBUS_CLIMIT_MASK
, val
);
278 static int axp20x_usb_power_set_property(struct power_supply
*psy
,
279 enum power_supply_property psp
,
280 const union power_supply_propval
*val
)
282 struct axp20x_usb_power
*power
= power_supply_get_drvdata(psy
);
285 case POWER_SUPPLY_PROP_VOLTAGE_MIN
:
286 return axp20x_usb_power_set_voltage_min(power
, val
->intval
);
288 case POWER_SUPPLY_PROP_CURRENT_MAX
:
289 return axp20x_usb_power_set_current_max(power
, val
->intval
);
298 static int axp20x_usb_power_prop_writeable(struct power_supply
*psy
,
299 enum power_supply_property psp
)
301 return psp
== POWER_SUPPLY_PROP_VOLTAGE_MIN
||
302 psp
== POWER_SUPPLY_PROP_CURRENT_MAX
;
305 static enum power_supply_property axp20x_usb_power_properties
[] = {
306 POWER_SUPPLY_PROP_HEALTH
,
307 POWER_SUPPLY_PROP_PRESENT
,
308 POWER_SUPPLY_PROP_ONLINE
,
309 POWER_SUPPLY_PROP_VOLTAGE_MIN
,
310 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
311 POWER_SUPPLY_PROP_CURRENT_MAX
,
312 POWER_SUPPLY_PROP_CURRENT_NOW
,
315 static enum power_supply_property axp22x_usb_power_properties
[] = {
316 POWER_SUPPLY_PROP_HEALTH
,
317 POWER_SUPPLY_PROP_PRESENT
,
318 POWER_SUPPLY_PROP_ONLINE
,
319 POWER_SUPPLY_PROP_VOLTAGE_MIN
,
320 POWER_SUPPLY_PROP_CURRENT_MAX
,
323 static const struct power_supply_desc axp20x_usb_power_desc
= {
324 .name
= "axp20x-usb",
325 .type
= POWER_SUPPLY_TYPE_USB
,
326 .properties
= axp20x_usb_power_properties
,
327 .num_properties
= ARRAY_SIZE(axp20x_usb_power_properties
),
328 .property_is_writeable
= axp20x_usb_power_prop_writeable
,
329 .get_property
= axp20x_usb_power_get_property
,
330 .set_property
= axp20x_usb_power_set_property
,
333 static const struct power_supply_desc axp22x_usb_power_desc
= {
334 .name
= "axp20x-usb",
335 .type
= POWER_SUPPLY_TYPE_USB
,
336 .properties
= axp22x_usb_power_properties
,
337 .num_properties
= ARRAY_SIZE(axp22x_usb_power_properties
),
338 .property_is_writeable
= axp20x_usb_power_prop_writeable
,
339 .get_property
= axp20x_usb_power_get_property
,
340 .set_property
= axp20x_usb_power_set_property
,
343 static int configure_iio_channels(struct platform_device
*pdev
,
344 struct axp20x_usb_power
*power
)
346 power
->vbus_v
= devm_iio_channel_get(&pdev
->dev
, "vbus_v");
347 if (IS_ERR(power
->vbus_v
)) {
348 if (PTR_ERR(power
->vbus_v
) == -ENODEV
)
349 return -EPROBE_DEFER
;
350 return PTR_ERR(power
->vbus_v
);
353 power
->vbus_i
= devm_iio_channel_get(&pdev
->dev
, "vbus_i");
354 if (IS_ERR(power
->vbus_i
)) {
355 if (PTR_ERR(power
->vbus_i
) == -ENODEV
)
356 return -EPROBE_DEFER
;
357 return PTR_ERR(power
->vbus_i
);
363 static int configure_adc_registers(struct axp20x_usb_power
*power
)
365 /* Enable vbus voltage and current measurement */
366 return regmap_update_bits(power
->regmap
, AXP20X_ADC_EN1
,
367 AXP20X_ADC_EN1_VBUS_CURR
|
368 AXP20X_ADC_EN1_VBUS_VOLT
,
369 AXP20X_ADC_EN1_VBUS_CURR
|
370 AXP20X_ADC_EN1_VBUS_VOLT
);
373 static int axp20x_usb_power_probe(struct platform_device
*pdev
)
375 struct axp20x_dev
*axp20x
= dev_get_drvdata(pdev
->dev
.parent
);
376 struct power_supply_config psy_cfg
= {};
377 struct axp20x_usb_power
*power
;
378 static const char * const axp20x_irq_names
[] = { "VBUS_PLUGIN",
379 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL
};
380 static const char * const axp22x_irq_names
[] = {
381 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL
};
382 const char * const *irq_names
;
383 const struct power_supply_desc
*usb_power_desc
;
386 if (!of_device_is_available(pdev
->dev
.of_node
))
390 dev_err(&pdev
->dev
, "Parent drvdata not set\n");
394 power
= devm_kzalloc(&pdev
->dev
, sizeof(*power
), GFP_KERNEL
);
398 platform_set_drvdata(pdev
, power
);
399 power
->axp20x_id
= (enum axp20x_variants
)of_device_get_match_data(
402 power
->np
= pdev
->dev
.of_node
;
403 power
->regmap
= axp20x
->regmap
;
405 if (power
->axp20x_id
== AXP202_ID
) {
406 /* Enable vbus valid checking */
407 ret
= regmap_update_bits(power
->regmap
, AXP20X_VBUS_MON
,
408 AXP20X_VBUS_MON_VBUS_VALID
,
409 AXP20X_VBUS_MON_VBUS_VALID
);
413 if (IS_ENABLED(CONFIG_AXP20X_ADC
))
414 ret
= configure_iio_channels(pdev
, power
);
416 ret
= configure_adc_registers(power
);
421 usb_power_desc
= &axp20x_usb_power_desc
;
422 irq_names
= axp20x_irq_names
;
423 } else if (power
->axp20x_id
== AXP221_ID
||
424 power
->axp20x_id
== AXP223_ID
) {
425 usb_power_desc
= &axp22x_usb_power_desc
;
426 irq_names
= axp22x_irq_names
;
428 dev_err(&pdev
->dev
, "Unsupported AXP variant: %ld\n",
433 psy_cfg
.of_node
= pdev
->dev
.of_node
;
434 psy_cfg
.drv_data
= power
;
436 power
->supply
= devm_power_supply_register(&pdev
->dev
, usb_power_desc
,
438 if (IS_ERR(power
->supply
))
439 return PTR_ERR(power
->supply
);
441 /* Request irqs after registering, as irqs may trigger immediately */
442 for (i
= 0; irq_names
[i
]; i
++) {
443 irq
= platform_get_irq_byname(pdev
, irq_names
[i
]);
445 dev_warn(&pdev
->dev
, "No IRQ for %s: %d\n",
449 irq
= regmap_irq_get_virq(axp20x
->regmap_irqc
, irq
);
450 ret
= devm_request_any_context_irq(&pdev
->dev
, irq
,
451 axp20x_usb_power_irq
, 0, DRVNAME
, power
);
453 dev_warn(&pdev
->dev
, "Error requesting %s IRQ: %d\n",
457 INIT_DELAYED_WORK(&power
->vbus_detect
, axp20x_usb_power_poll_vbus
);
458 if (axp20x_usb_vbus_needs_polling(power
))
459 queue_delayed_work(system_wq
, &power
->vbus_detect
, 0);
464 static int axp20x_usb_power_remove(struct platform_device
*pdev
)
466 struct axp20x_usb_power
*power
= platform_get_drvdata(pdev
);
468 cancel_delayed_work_sync(&power
->vbus_detect
);
473 static const struct of_device_id axp20x_usb_power_match
[] = {
475 .compatible
= "x-powers,axp202-usb-power-supply",
476 .data
= (void *)AXP202_ID
,
478 .compatible
= "x-powers,axp221-usb-power-supply",
479 .data
= (void *)AXP221_ID
,
481 .compatible
= "x-powers,axp223-usb-power-supply",
482 .data
= (void *)AXP223_ID
,
483 }, { /* sentinel */ }
485 MODULE_DEVICE_TABLE(of
, axp20x_usb_power_match
);
487 static struct platform_driver axp20x_usb_power_driver
= {
488 .probe
= axp20x_usb_power_probe
,
489 .remove
= axp20x_usb_power_remove
,
492 .of_match_table
= axp20x_usb_power_match
,
496 module_platform_driver(axp20x_usb_power_driver
);
498 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
499 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
500 MODULE_LICENSE("GPL");