2 * Motorola CPCAP PMIC battery charger driver
4 * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
6 * Rewritten for Linux power framework with some parts based on
7 * on earlier driver found in the Motorola Linux kernel:
9 * Copyright (C) 2009-2010 Motorola, Inc.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/atomic.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/err.h>
26 #include <linux/interrupt.h>
27 #include <linux/notifier.h>
29 #include <linux/of_platform.h>
30 #include <linux/platform_device.h>
31 #include <linux/power_supply.h>
32 #include <linux/regmap.h>
34 #include <linux/gpio/consumer.h>
35 #include <linux/usb/phy_companion.h>
36 #include <linux/phy/omap_usb.h>
37 #include <linux/usb/otg.h>
38 #include <linux/iio/consumer.h>
39 #include <linux/mfd/motorola-cpcap.h>
41 /* CPCAP_REG_CRM register bits */
42 #define CPCAP_REG_CRM_UNUSED_641_15 BIT(15) /* 641 = register number */
43 #define CPCAP_REG_CRM_UNUSED_641_14 BIT(14) /* 641 = register number */
44 #define CPCAP_REG_CRM_CHRG_LED_EN BIT(13)
45 #define CPCAP_REG_CRM_RVRSMODE BIT(12)
46 #define CPCAP_REG_CRM_ICHRG_TR1 BIT(11)
47 #define CPCAP_REG_CRM_ICHRG_TR0 BIT(10)
48 #define CPCAP_REG_CRM_FET_OVRD BIT(9)
49 #define CPCAP_REG_CRM_FET_CTRL BIT(8)
50 #define CPCAP_REG_CRM_VCHRG3 BIT(7)
51 #define CPCAP_REG_CRM_VCHRG2 BIT(6)
52 #define CPCAP_REG_CRM_VCHRG1 BIT(5)
53 #define CPCAP_REG_CRM_VCHRG0 BIT(4)
54 #define CPCAP_REG_CRM_ICHRG3 BIT(3)
55 #define CPCAP_REG_CRM_ICHRG2 BIT(2)
56 #define CPCAP_REG_CRM_ICHRG1 BIT(1)
57 #define CPCAP_REG_CRM_ICHRG0 BIT(0)
59 /* CPCAP_REG_CRM trickle charge voltages */
60 #define CPCAP_REG_CRM_TR(val) (((val) & 0x3) << 10)
61 #define CPCAP_REG_CRM_TR_0A00 CPCAP_REG_CRM_TR(0x0)
62 #define CPCAP_REG_CRM_TR_0A24 CPCAP_REG_CRM_TR(0x1)
63 #define CPCAP_REG_CRM_TR_0A48 CPCAP_REG_CRM_TR(0x2)
64 #define CPCAP_REG_CRM_TR_0A72 CPCAP_REG_CRM_TR(0x4)
66 /* CPCAP_REG_CRM charge voltages */
67 #define CPCAP_REG_CRM_VCHRG(val) (((val) & 0xf) << 4)
68 #define CPCAP_REG_CRM_VCHRG_3V80 CPCAP_REG_CRM_VCHRG(0x0)
69 #define CPCAP_REG_CRM_VCHRG_4V10 CPCAP_REG_CRM_VCHRG(0x1)
70 #define CPCAP_REG_CRM_VCHRG_4V15 CPCAP_REG_CRM_VCHRG(0x2)
71 #define CPCAP_REG_CRM_VCHRG_4V20 CPCAP_REG_CRM_VCHRG(0x3)
72 #define CPCAP_REG_CRM_VCHRG_4V22 CPCAP_REG_CRM_VCHRG(0x4)
73 #define CPCAP_REG_CRM_VCHRG_4V24 CPCAP_REG_CRM_VCHRG(0x5)
74 #define CPCAP_REG_CRM_VCHRG_4V26 CPCAP_REG_CRM_VCHRG(0x6)
75 #define CPCAP_REG_CRM_VCHRG_4V28 CPCAP_REG_CRM_VCHRG(0x7)
76 #define CPCAP_REG_CRM_VCHRG_4V30 CPCAP_REG_CRM_VCHRG(0x8)
77 #define CPCAP_REG_CRM_VCHRG_4V32 CPCAP_REG_CRM_VCHRG(0x9)
78 #define CPCAP_REG_CRM_VCHRG_4V34 CPCAP_REG_CRM_VCHRG(0xa)
79 #define CPCAP_REG_CRM_VCHRG_4V36 CPCAP_REG_CRM_VCHRG(0xb)
80 #define CPCAP_REG_CRM_VCHRG_4V38 CPCAP_REG_CRM_VCHRG(0xc)
81 #define CPCAP_REG_CRM_VCHRG_4V40 CPCAP_REG_CRM_VCHRG(0xd)
82 #define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe)
83 #define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf)
85 /* CPCAP_REG_CRM charge currents */
86 #define CPCAP_REG_CRM_ICHRG(val) (((val) & 0xf) << 0)
87 #define CPCAP_REG_CRM_ICHRG_0A000 CPCAP_REG_CRM_ICHRG(0x0)
88 #define CPCAP_REG_CRM_ICHRG_0A070 CPCAP_REG_CRM_ICHRG(0x1)
89 #define CPCAP_REG_CRM_ICHRG_0A176 CPCAP_REG_CRM_ICHRG(0x2)
90 #define CPCAP_REG_CRM_ICHRG_0A264 CPCAP_REG_CRM_ICHRG(0x3)
91 #define CPCAP_REG_CRM_ICHRG_0A352 CPCAP_REG_CRM_ICHRG(0x4)
92 #define CPCAP_REG_CRM_ICHRG_0A440 CPCAP_REG_CRM_ICHRG(0x5)
93 #define CPCAP_REG_CRM_ICHRG_0A528 CPCAP_REG_CRM_ICHRG(0x6)
94 #define CPCAP_REG_CRM_ICHRG_0A616 CPCAP_REG_CRM_ICHRG(0x7)
95 #define CPCAP_REG_CRM_ICHRG_0A704 CPCAP_REG_CRM_ICHRG(0x8)
96 #define CPCAP_REG_CRM_ICHRG_0A792 CPCAP_REG_CRM_ICHRG(0x9)
97 #define CPCAP_REG_CRM_ICHRG_0A880 CPCAP_REG_CRM_ICHRG(0xa)
98 #define CPCAP_REG_CRM_ICHRG_0A968 CPCAP_REG_CRM_ICHRG(0xb)
99 #define CPCAP_REG_CRM_ICHRG_1A056 CPCAP_REG_CRM_ICHRG(0xc)
100 #define CPCAP_REG_CRM_ICHRG_1A144 CPCAP_REG_CRM_ICHRG(0xd)
101 #define CPCAP_REG_CRM_ICHRG_1A584 CPCAP_REG_CRM_ICHRG(0xe)
102 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf)
105 CPCAP_CHARGER_IIO_BATTDET
,
106 CPCAP_CHARGER_IIO_VOLTAGE
,
107 CPCAP_CHARGER_IIO_VBUS
,
108 CPCAP_CHARGER_IIO_CHRG_CURRENT
,
109 CPCAP_CHARGER_IIO_BATT_CURRENT
,
110 CPCAP_CHARGER_IIO_NR
,
113 struct cpcap_charger_ddata
{
116 struct list_head irq_list
;
117 struct delayed_work detect_work
;
118 struct delayed_work vbus_work
;
119 struct gpio_desc
*gpio
[2]; /* gpio_reven0 & 1 */
121 struct iio_channel
*channels
[CPCAP_CHARGER_IIO_NR
];
123 struct power_supply
*usb
;
125 struct phy_companion comparator
; /* For USB VBUS */
132 struct cpcap_interrupt_desc
{
134 struct list_head node
;
138 struct cpcap_charger_ints_state
{
151 static enum power_supply_property cpcap_charger_props
[] = {
152 POWER_SUPPLY_PROP_STATUS
,
153 POWER_SUPPLY_PROP_ONLINE
,
154 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
155 POWER_SUPPLY_PROP_CURRENT_NOW
,
158 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata
*ddata
)
160 struct iio_channel
*channel
;
163 channel
= ddata
->channels
[CPCAP_CHARGER_IIO_BATTDET
];
164 error
= iio_read_channel_raw(channel
, &value
);
166 dev_warn(ddata
->dev
, "%s failed: %i\n", __func__
, error
);
174 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata
*ddata
)
176 struct iio_channel
*channel
;
177 int error
, value
= 0;
179 channel
= ddata
->channels
[CPCAP_CHARGER_IIO_VOLTAGE
];
180 error
= iio_read_channel_processed(channel
, &value
);
182 dev_warn(ddata
->dev
, "%s failed: %i\n", __func__
, error
);
190 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata
*ddata
)
192 struct iio_channel
*channel
;
193 int error
, value
= 0;
195 channel
= ddata
->channels
[CPCAP_CHARGER_IIO_CHRG_CURRENT
];
196 error
= iio_read_channel_processed(channel
, &value
);
198 dev_warn(ddata
->dev
, "%s failed: %i\n", __func__
, error
);
206 static int cpcap_charger_get_property(struct power_supply
*psy
,
207 enum power_supply_property psp
,
208 union power_supply_propval
*val
)
210 struct cpcap_charger_ddata
*ddata
= dev_get_drvdata(psy
->dev
.parent
);
213 case POWER_SUPPLY_PROP_STATUS
:
214 val
->intval
= ddata
->status
;
216 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
217 if (ddata
->status
== POWER_SUPPLY_STATUS_CHARGING
)
218 val
->intval
= cpcap_charger_get_charge_voltage(ddata
) *
223 case POWER_SUPPLY_PROP_CURRENT_NOW
:
224 if (ddata
->status
== POWER_SUPPLY_STATUS_CHARGING
)
225 val
->intval
= cpcap_charger_get_charge_current(ddata
) *
230 case POWER_SUPPLY_PROP_ONLINE
:
231 val
->intval
= ddata
->status
== POWER_SUPPLY_STATUS_CHARGING
;
240 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata
*ddata
,
246 gpiod_set_value(ddata
->gpio
[0], enabled
);
249 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata
*ddata
,
255 gpiod_set_value(ddata
->gpio
[1], enabled
);
258 static int cpcap_charger_set_state(struct cpcap_charger_ddata
*ddata
,
259 int max_voltage
, int charge_current
,
265 enable
= max_voltage
&& (charge_current
|| trickle_current
);
266 dev_dbg(ddata
->dev
, "%s enable: %i\n", __func__
, enable
);
269 error
= regmap_update_bits(ddata
->reg
, CPCAP_REG_CRM
,
271 CPCAP_REG_CRM_FET_OVRD
|
272 CPCAP_REG_CRM_FET_CTRL
);
274 ddata
->status
= POWER_SUPPLY_STATUS_UNKNOWN
;
278 ddata
->status
= POWER_SUPPLY_STATUS_DISCHARGING
;
283 error
= regmap_update_bits(ddata
->reg
, CPCAP_REG_CRM
, 0x3fff,
284 CPCAP_REG_CRM_CHRG_LED_EN
|
286 CPCAP_REG_CRM_FET_OVRD
|
287 CPCAP_REG_CRM_FET_CTRL
|
291 ddata
->status
= POWER_SUPPLY_STATUS_UNKNOWN
;
295 ddata
->status
= POWER_SUPPLY_STATUS_CHARGING
;
300 dev_err(ddata
->dev
, "%s failed with %i\n", __func__
, error
);
305 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata
*ddata
)
307 int error
, value
= 0;
308 struct iio_channel
*channel
=
309 ddata
->channels
[CPCAP_CHARGER_IIO_VBUS
];
311 error
= iio_read_channel_processed(channel
, &value
);
313 return value
> 3900 ? true : false;
315 dev_err(ddata
->dev
, "error reading VBUS: %i\n", error
);
320 /* VBUS control functions for the USB PHY companion */
322 static void cpcap_charger_vbus_work(struct work_struct
*work
)
324 struct cpcap_charger_ddata
*ddata
;
328 ddata
= container_of(work
, struct cpcap_charger_ddata
,
331 if (ddata
->vbus_enabled
) {
332 vbus
= cpcap_charger_vbus_valid(ddata
);
334 dev_info(ddata
->dev
, "VBUS already provided\n");
339 cpcap_charger_set_cable_path(ddata
, false);
340 cpcap_charger_set_inductive_path(ddata
, false);
342 error
= cpcap_charger_set_state(ddata
, 0, 0, 0);
346 error
= regmap_update_bits(ddata
->reg
, CPCAP_REG_CRM
,
347 CPCAP_REG_CRM_RVRSMODE
,
348 CPCAP_REG_CRM_RVRSMODE
);
352 error
= regmap_update_bits(ddata
->reg
, CPCAP_REG_CRM
,
353 CPCAP_REG_CRM_RVRSMODE
, 0);
357 cpcap_charger_set_cable_path(ddata
, true);
358 cpcap_charger_set_inductive_path(ddata
, true);
364 dev_err(ddata
->dev
, "%s could not %s vbus: %i\n", __func__
,
365 ddata
->vbus_enabled
? "enable" : "disable", error
);
368 static int cpcap_charger_set_vbus(struct phy_companion
*comparator
,
371 struct cpcap_charger_ddata
*ddata
=
372 container_of(comparator
, struct cpcap_charger_ddata
,
375 ddata
->vbus_enabled
= enabled
;
376 schedule_delayed_work(&ddata
->vbus_work
, 0);
381 /* Charger interrupt handling functions */
383 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata
*ddata
,
384 struct cpcap_charger_ints_state
*s
)
388 error
= regmap_read(ddata
->reg
, CPCAP_REG_INTS1
, &val
);
392 s
->chrg_det
= val
& BIT(13);
393 s
->rvrs_chrg
= val
& BIT(12);
394 s
->vbusov
= val
& BIT(11);
396 error
= regmap_read(ddata
->reg
, CPCAP_REG_INTS2
, &val
);
400 s
->chrg_se1b
= val
& BIT(13);
401 s
->rvrs_mode
= val
& BIT(6);
402 s
->chrgcurr1
= val
& BIT(4);
403 s
->vbusvld
= val
& BIT(3);
405 error
= regmap_read(ddata
->reg
, CPCAP_REG_INTS4
, &val
);
409 s
->battdetb
= val
& BIT(6);
414 static void cpcap_usb_detect(struct work_struct
*work
)
416 struct cpcap_charger_ddata
*ddata
;
417 struct cpcap_charger_ints_state s
;
420 ddata
= container_of(work
, struct cpcap_charger_ddata
,
423 error
= cpcap_charger_get_ints_state(ddata
, &s
);
427 if (cpcap_charger_vbus_valid(ddata
) && s
.chrgcurr1
) {
430 if (cpcap_charger_battery_found(ddata
))
431 max_current
= CPCAP_REG_CRM_ICHRG_1A584
;
433 max_current
= CPCAP_REG_CRM_ICHRG_0A528
;
435 error
= cpcap_charger_set_state(ddata
,
436 CPCAP_REG_CRM_VCHRG_4V20
,
438 CPCAP_REG_CRM_TR_0A72
);
442 error
= cpcap_charger_set_state(ddata
, 0, 0, 0);
450 dev_err(ddata
->dev
, "%s failed with %i\n", __func__
, error
);
453 static irqreturn_t
cpcap_charger_irq_thread(int irq
, void *data
)
455 struct cpcap_charger_ddata
*ddata
= data
;
457 if (!atomic_read(&ddata
->active
))
460 schedule_delayed_work(&ddata
->detect_work
, 0);
465 static int cpcap_usb_init_irq(struct platform_device
*pdev
,
466 struct cpcap_charger_ddata
*ddata
,
469 struct cpcap_interrupt_desc
*d
;
472 irq
= platform_get_irq_byname(pdev
, name
);
476 error
= devm_request_threaded_irq(ddata
->dev
, irq
, NULL
,
477 cpcap_charger_irq_thread
,
481 dev_err(ddata
->dev
, "could not get irq %s: %i\n",
487 d
= devm_kzalloc(ddata
->dev
, sizeof(*d
), GFP_KERNEL
);
493 list_add(&d
->node
, &ddata
->irq_list
);
498 static const char * const cpcap_charger_irqs
[] = {
500 "chrg_det", "rvrs_chrg",
503 "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr1", "vbusvld",
509 static int cpcap_usb_init_interrupts(struct platform_device
*pdev
,
510 struct cpcap_charger_ddata
*ddata
)
514 for (i
= 0; i
< ARRAY_SIZE(cpcap_charger_irqs
); i
++) {
515 error
= cpcap_usb_init_irq(pdev
, ddata
, cpcap_charger_irqs
[i
]);
523 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata
*ddata
)
527 for (i
= 0; i
< 2; i
++) {
528 ddata
->gpio
[i
] = devm_gpiod_get_index(ddata
->dev
, "mode",
530 if (IS_ERR(ddata
->gpio
[i
])) {
531 dev_info(ddata
->dev
, "no mode change GPIO%i: %li\n",
532 i
, PTR_ERR(ddata
->gpio
[i
]));
533 ddata
->gpio
[i
] = NULL
;
538 static int cpcap_charger_init_iio(struct cpcap_charger_ddata
*ddata
)
540 const char * const names
[CPCAP_CHARGER_IIO_NR
] = {
541 "battdetb", "battp", "vbus", "chg_isense", "batti",
545 for (i
= 0; i
< CPCAP_CHARGER_IIO_NR
; i
++) {
546 ddata
->channels
[i
] = devm_iio_channel_get(ddata
->dev
,
548 if (IS_ERR(ddata
->channels
[i
])) {
549 error
= PTR_ERR(ddata
->channels
[i
]);
553 if (!ddata
->channels
[i
]->indio_dev
) {
562 dev_err(ddata
->dev
, "could not initialize VBUS or ID IIO: %i\n",
568 static const struct power_supply_desc cpcap_charger_usb_desc
= {
570 .type
= POWER_SUPPLY_TYPE_USB
,
571 .properties
= cpcap_charger_props
,
572 .num_properties
= ARRAY_SIZE(cpcap_charger_props
),
573 .get_property
= cpcap_charger_get_property
,
577 static const struct of_device_id cpcap_charger_id_table
[] = {
579 .compatible
= "motorola,mapphone-cpcap-charger",
583 MODULE_DEVICE_TABLE(of
, cpcap_charger_id_table
);
586 static int cpcap_charger_probe(struct platform_device
*pdev
)
588 struct cpcap_charger_ddata
*ddata
;
589 const struct of_device_id
*of_id
;
592 of_id
= of_match_device(of_match_ptr(cpcap_charger_id_table
),
597 ddata
= devm_kzalloc(&pdev
->dev
, sizeof(*ddata
), GFP_KERNEL
);
601 ddata
->dev
= &pdev
->dev
;
603 ddata
->reg
= dev_get_regmap(ddata
->dev
->parent
, NULL
);
607 INIT_LIST_HEAD(&ddata
->irq_list
);
608 INIT_DELAYED_WORK(&ddata
->detect_work
, cpcap_usb_detect
);
609 INIT_DELAYED_WORK(&ddata
->vbus_work
, cpcap_charger_vbus_work
);
610 platform_set_drvdata(pdev
, ddata
);
612 error
= cpcap_charger_init_iio(ddata
);
616 atomic_set(&ddata
->active
, 1);
618 ddata
->usb
= devm_power_supply_register(ddata
->dev
,
619 &cpcap_charger_usb_desc
,
621 if (IS_ERR(ddata
->usb
)) {
622 error
= PTR_ERR(ddata
->usb
);
623 dev_err(ddata
->dev
, "failed to register USB charger: %i\n",
629 error
= cpcap_usb_init_interrupts(pdev
, ddata
);
633 ddata
->comparator
.set_vbus
= cpcap_charger_set_vbus
;
634 error
= omap_usb2_set_comparator(&ddata
->comparator
);
635 if (error
== -ENODEV
) {
636 dev_info(ddata
->dev
, "charger needs phy, deferring probe\n");
637 return -EPROBE_DEFER
;
640 cpcap_charger_init_optional_gpios(ddata
);
642 schedule_delayed_work(&ddata
->detect_work
, 0);
647 static int cpcap_charger_remove(struct platform_device
*pdev
)
649 struct cpcap_charger_ddata
*ddata
= platform_get_drvdata(pdev
);
652 atomic_set(&ddata
->active
, 0);
653 error
= omap_usb2_set_comparator(NULL
);
655 dev_warn(ddata
->dev
, "could not clear USB comparator: %i\n",
658 error
= cpcap_charger_set_state(ddata
, 0, 0, 0);
660 dev_warn(ddata
->dev
, "could not clear charger: %i\n",
662 cancel_delayed_work_sync(&ddata
->vbus_work
);
663 cancel_delayed_work_sync(&ddata
->detect_work
);
668 static struct platform_driver cpcap_charger_driver
= {
669 .probe
= cpcap_charger_probe
,
671 .name
= "cpcap-charger",
672 .of_match_table
= of_match_ptr(cpcap_charger_id_table
),
674 .remove
= cpcap_charger_remove
,
676 module_platform_driver(cpcap_charger_driver
);
678 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
679 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
680 MODULE_LICENSE("GPL v2");
681 MODULE_ALIAS("platform:cpcap-charger");