1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC
4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
5 *
6 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
7 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
8 */
9
10 #include <linux/extcon-provider.h>
11 #include <linux/interrupt.h>
12 #include <linux/kernel.h>
13 #include <linux/mfd/intel_soc_pmic.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/property.h>
19 #include <linux/regmap.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/slab.h>
22 #include <linux/usb/role.h>
23
24 #include "extcon-intel.h"
25
26 #define CHT_WC_PHYCTRL 0x5e07
27
28 #define CHT_WC_CHGRCTRL0 0x5e16
29 #define CHT_WC_CHGRCTRL0_CHGRRESET BIT(0)
30 #define CHT_WC_CHGRCTRL0_EMRGCHREN BIT(1)
31 #define CHT_WC_CHGRCTRL0_EXTCHRDIS BIT(2)
32 #define CHT_WC_CHGRCTRL0_SWCONTROL BIT(3)
33 #define CHT_WC_CHGRCTRL0_TTLCK BIT(4)
34 #define CHT_WC_CHGRCTRL0_CCSM_OFF BIT(5)
35 #define CHT_WC_CHGRCTRL0_DBPOFF BIT(6)
36 #define CHT_WC_CHGRCTRL0_CHR_WDT_NOKICK BIT(7)
37
38 #define CHT_WC_CHGRCTRL1 0x5e17
39 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_100 BIT(0)
40 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_150 BIT(1)
41 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_500 BIT(2)
42 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_900 BIT(3)
43 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_1500 BIT(4)
44 #define CHT_WC_CHGRCTRL1_FTEMP_EVENT BIT(5)
45 #define CHT_WC_CHGRCTRL1_OTGMODE BIT(6)
46 #define CHT_WC_CHGRCTRL1_DBPEN BIT(7)
47
48 #define CHT_WC_USBSRC 0x5e29
49 #define CHT_WC_USBSRC_STS_MASK GENMASK(1, 0)
50 #define CHT_WC_USBSRC_STS_SUCCESS 2
51 #define CHT_WC_USBSRC_STS_FAIL 3
52 #define CHT_WC_USBSRC_TYPE_SHIFT 2
53 #define CHT_WC_USBSRC_TYPE_MASK GENMASK(5, 2)
54 #define CHT_WC_USBSRC_TYPE_NONE 0
55 #define CHT_WC_USBSRC_TYPE_SDP 1
56 #define CHT_WC_USBSRC_TYPE_DCP 2
57 #define CHT_WC_USBSRC_TYPE_CDP 3
58 #define CHT_WC_USBSRC_TYPE_ACA 4
59 #define CHT_WC_USBSRC_TYPE_SE1 5
60 #define CHT_WC_USBSRC_TYPE_MHL 6
61 #define CHT_WC_USBSRC_TYPE_FLOATING 7
62 #define CHT_WC_USBSRC_TYPE_OTHER 8
63 #define CHT_WC_USBSRC_TYPE_DCP_EXTPHY 9
64
65 #define CHT_WC_CHGDISCTRL 0x5e2f
66 #define CHT_WC_CHGDISCTRL_OUT BIT(0)
67 /* 0 - open drain, 1 - regular push-pull output */
68 #define CHT_WC_CHGDISCTRL_DRV BIT(4)
69 /* 0 - pin is controlled by SW, 1 - by HW */
70 #define CHT_WC_CHGDISCTRL_FN BIT(6)
71
72 #define CHT_WC_PWRSRC_IRQ 0x6e03
73 #define CHT_WC_PWRSRC_IRQ_MASK 0x6e0f
74 #define CHT_WC_PWRSRC_STS 0x6e1e
75 #define CHT_WC_PWRSRC_VBUS BIT(0)
76 #define CHT_WC_PWRSRC_DC BIT(1)
77 #define CHT_WC_PWRSRC_BATT BIT(2)
78 #define CHT_WC_PWRSRC_USBID_MASK GENMASK(4, 3)
79 #define CHT_WC_PWRSRC_USBID_SHIFT 3
80 #define CHT_WC_PWRSRC_RID_ACA 0
81 #define CHT_WC_PWRSRC_RID_GND 1
82 #define CHT_WC_PWRSRC_RID_FLOAT 2
83
84 #define CHT_WC_VBUS_GPIO_CTLO 0x6e2d
85 #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT BIT(0)
86 #define CHT_WC_VBUS_GPIO_CTLO_DRV_OD BIT(4)
87 #define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT BIT(5)
88
89 enum cht_wc_mux_select {
90 MUX_SEL_PMIC = 0,
91 MUX_SEL_SOC,
92 };
93
94 static const unsigned int cht_wc_extcon_cables[] = {
95 EXTCON_USB,
96 EXTCON_USB_HOST,
97 EXTCON_CHG_USB_SDP,
98 EXTCON_CHG_USB_CDP,
99 EXTCON_CHG_USB_DCP,
100 EXTCON_CHG_USB_ACA,
101 EXTCON_NONE,
102 };
103
104 struct cht_wc_extcon_data {
105 struct device *dev;
106 struct regmap *regmap;
107 struct extcon_dev *edev;
108 struct usb_role_switch *role_sw;
109 struct regulator *vbus_boost;
110 struct power_supply *psy;
111 enum power_supply_usb_type usb_type;
112 unsigned int previous_cable;
113 bool usb_host;
114 bool vbus_boost_enabled;
115 };
116
cht_wc_extcon_get_id(struct cht_wc_extcon_data * ext,int pwrsrc_sts)117 static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts)
118 {
119 switch ((pwrsrc_sts & CHT_WC_PWRSRC_USBID_MASK) >> CHT_WC_PWRSRC_USBID_SHIFT) {
120 case CHT_WC_PWRSRC_RID_GND:
121 return INTEL_USB_ID_GND;
122 case CHT_WC_PWRSRC_RID_FLOAT:
123 return INTEL_USB_ID_FLOAT;
124 /*
125 * According to the spec. we should read the USB-ID pin ADC value here
126 * to determine the resistance of the used pull-down resister and then
127 * return RID_A / RID_B / RID_C based on this. But all "Accessory
128 * Charger Adapter"s (ACAs) which users can actually buy always use
129 * a combination of a charging port with one or more USB-A ports, so
130 * they should always use a resistor indicating RID_A. But the spec
131 * is hard to read / badly-worded so some of them actually indicate
132 * they are a RID_B ACA evnen though they clearly are a RID_A ACA.
133 * To workaround this simply always return INTEL_USB_RID_A, which
134 * matches all the ACAs which users can actually buy.
135 */
136 case CHT_WC_PWRSRC_RID_ACA:
137 return INTEL_USB_RID_A;
138 default:
139 return INTEL_USB_ID_FLOAT;
140 }
141 }
142
cht_wc_extcon_get_charger(struct cht_wc_extcon_data * ext,bool ignore_errors)143 static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext,
144 bool ignore_errors)
145 {
146 int ret, usbsrc, status;
147 unsigned long timeout;
148
149 /* Charger detection can take upto 600ms, wait 800ms max. */
150 timeout = jiffies + msecs_to_jiffies(800);
151 do {
152 ret = regmap_read(ext->regmap, CHT_WC_USBSRC, &usbsrc);
153 if (ret) {
154 dev_err(ext->dev, "Error reading usbsrc: %d\n", ret);
155 return ret;
156 }
157
158 status = usbsrc & CHT_WC_USBSRC_STS_MASK;
159 if (status == CHT_WC_USBSRC_STS_SUCCESS ||
160 status == CHT_WC_USBSRC_STS_FAIL)
161 break;
162
163 msleep(50); /* Wait a bit before retrying */
164 } while (time_before(jiffies, timeout));
165
166 if (status != CHT_WC_USBSRC_STS_SUCCESS) {
167 if (!ignore_errors) {
168 if (status == CHT_WC_USBSRC_STS_FAIL)
169 dev_warn(ext->dev, "Could not detect charger type\n");
170 else
171 dev_warn(ext->dev, "Timeout detecting charger type\n");
172 }
173
174 /* Safe fallback */
175 usbsrc = CHT_WC_USBSRC_TYPE_SDP << CHT_WC_USBSRC_TYPE_SHIFT;
176 }
177
178 usbsrc = (usbsrc & CHT_WC_USBSRC_TYPE_MASK) >> CHT_WC_USBSRC_TYPE_SHIFT;
179 switch (usbsrc) {
180 default:
181 dev_warn(ext->dev,
182 "Unhandled charger type %d, defaulting to SDP\n",
183 ret);
184 ext->usb_type = POWER_SUPPLY_USB_TYPE_SDP;
185 return EXTCON_CHG_USB_SDP;
186 case CHT_WC_USBSRC_TYPE_SDP:
187 case CHT_WC_USBSRC_TYPE_FLOATING:
188 case CHT_WC_USBSRC_TYPE_OTHER:
189 ext->usb_type = POWER_SUPPLY_USB_TYPE_SDP;
190 return EXTCON_CHG_USB_SDP;
191 case CHT_WC_USBSRC_TYPE_CDP:
192 ext->usb_type = POWER_SUPPLY_USB_TYPE_CDP;
193 return EXTCON_CHG_USB_CDP;
194 case CHT_WC_USBSRC_TYPE_DCP:
195 case CHT_WC_USBSRC_TYPE_DCP_EXTPHY:
196 case CHT_WC_USBSRC_TYPE_MHL: /* MHL2+ delivers upto 2A, treat as DCP */
197 ext->usb_type = POWER_SUPPLY_USB_TYPE_DCP;
198 return EXTCON_CHG_USB_DCP;
199 case CHT_WC_USBSRC_TYPE_ACA:
200 ext->usb_type = POWER_SUPPLY_USB_TYPE_ACA;
201 return EXTCON_CHG_USB_ACA;
202 }
203 }
204
cht_wc_extcon_set_phymux(struct cht_wc_extcon_data * ext,u8 state)205 static void cht_wc_extcon_set_phymux(struct cht_wc_extcon_data *ext, u8 state)
206 {
207 int ret;
208
209 ret = regmap_write(ext->regmap, CHT_WC_PHYCTRL, state);
210 if (ret)
211 dev_err(ext->dev, "Error writing phyctrl: %d\n", ret);
212 }
213
cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data * ext,bool enable)214 static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext,
215 bool enable)
216 {
217 int ret, val;
218
219 /*
220 * The 5V boost converter is enabled through a gpio on the PMIC, since
221 * there currently is no gpio driver we access the gpio reg directly.
222 */
223 val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT;
224 if (enable)
225 val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT;
226
227 ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val);
228 if (ret)
229 dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret);
230 }
231
cht_wc_extcon_set_otgmode(struct cht_wc_extcon_data * ext,bool enable)232 static void cht_wc_extcon_set_otgmode(struct cht_wc_extcon_data *ext,
233 bool enable)
234 {
235 unsigned int val = enable ? CHT_WC_CHGRCTRL1_OTGMODE : 0;
236 int ret;
237
238 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL1,
239 CHT_WC_CHGRCTRL1_OTGMODE, val);
240 if (ret)
241 dev_err(ext->dev, "Error updating CHGRCTRL1 reg: %d\n", ret);
242
243 if (ext->vbus_boost && ext->vbus_boost_enabled != enable) {
244 if (enable)
245 ret = regulator_enable(ext->vbus_boost);
246 else
247 ret = regulator_disable(ext->vbus_boost);
248
249 if (ret)
250 dev_err(ext->dev, "Error updating Vbus boost regulator: %d\n", ret);
251 else
252 ext->vbus_boost_enabled = enable;
253 }
254 }
255
cht_wc_extcon_enable_charging(struct cht_wc_extcon_data * ext,bool enable)256 static void cht_wc_extcon_enable_charging(struct cht_wc_extcon_data *ext,
257 bool enable)
258 {
259 unsigned int val = enable ? 0 : CHT_WC_CHGDISCTRL_OUT;
260 int ret;
261
262 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL,
263 CHT_WC_CHGDISCTRL_OUT, val);
264 if (ret)
265 dev_err(ext->dev, "Error updating CHGDISCTRL reg: %d\n", ret);
266 }
267
268 /* Small helper to sync EXTCON_CHG_USB_SDP and EXTCON_USB state */
cht_wc_extcon_set_state(struct cht_wc_extcon_data * ext,unsigned int cable,bool state)269 static void cht_wc_extcon_set_state(struct cht_wc_extcon_data *ext,
270 unsigned int cable, bool state)
271 {
272 extcon_set_state_sync(ext->edev, cable, state);
273 if (cable == EXTCON_CHG_USB_SDP)
274 extcon_set_state_sync(ext->edev, EXTCON_USB, state);
275 }
276
cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data * ext)277 static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
278 {
279 int ret, pwrsrc_sts, id;
280 unsigned int cable = EXTCON_NONE;
281 /* Ignore errors in host mode, as the 5v boost converter is on then */
282 bool ignore_get_charger_errors = ext->usb_host;
283 enum usb_role role;
284
285 ext->usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
286
287 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
288 if (ret) {
289 dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);
290 return;
291 }
292
293 id = cht_wc_extcon_get_id(ext, pwrsrc_sts);
294 if (id == INTEL_USB_ID_GND) {
295 cht_wc_extcon_enable_charging(ext, false);
296 cht_wc_extcon_set_otgmode(ext, true);
297
298 /* The 5v boost causes a false VBUS / SDP detect, skip */
299 goto charger_det_done;
300 }
301
302 cht_wc_extcon_set_otgmode(ext, false);
303 cht_wc_extcon_enable_charging(ext, true);
304
305 /* Plugged into a host/charger or not connected? */
306 if (!(pwrsrc_sts & CHT_WC_PWRSRC_VBUS)) {
307 /* Route D+ and D- to PMIC for future charger detection */
308 cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);
309 goto set_state;
310 }
311
312 ret = cht_wc_extcon_get_charger(ext, ignore_get_charger_errors);
313 if (ret >= 0)
314 cable = ret;
315
316 charger_det_done:
317 /* Route D+ and D- to SoC for the host or gadget controller */
318 cht_wc_extcon_set_phymux(ext, MUX_SEL_SOC);
319
320 set_state:
321 if (cable != ext->previous_cable) {
322 cht_wc_extcon_set_state(ext, cable, true);
323 cht_wc_extcon_set_state(ext, ext->previous_cable, false);
324 ext->previous_cable = cable;
325 }
326
327 ext->usb_host = ((id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A));
328 extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host);
329
330 if (ext->usb_host)
331 role = USB_ROLE_HOST;
332 else if (pwrsrc_sts & CHT_WC_PWRSRC_VBUS)
333 role = USB_ROLE_DEVICE;
334 else
335 role = USB_ROLE_NONE;
336
337 /* Note: this is a no-op when ext->role_sw is NULL */
338 ret = usb_role_switch_set_role(ext->role_sw, role);
339 if (ret)
340 dev_err(ext->dev, "Error setting USB-role: %d\n", ret);
341
342 if (ext->psy)
343 power_supply_changed(ext->psy);
344 }
345
cht_wc_extcon_isr(int irq,void * data)346 static irqreturn_t cht_wc_extcon_isr(int irq, void *data)
347 {
348 struct cht_wc_extcon_data *ext = data;
349 int ret, irqs;
350
351 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_IRQ, &irqs);
352 if (ret) {
353 dev_err(ext->dev, "Error reading irqs: %d\n", ret);
354 return IRQ_NONE;
355 }
356
357 cht_wc_extcon_pwrsrc_event(ext);
358
359 ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ, irqs);
360 if (ret) {
361 dev_err(ext->dev, "Error writing irqs: %d\n", ret);
362 return IRQ_NONE;
363 }
364
365 return IRQ_HANDLED;
366 }
367
cht_wc_extcon_sw_control(struct cht_wc_extcon_data * ext,bool enable)368 static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable)
369 {
370 int ret, mask, val;
371
372 val = enable ? 0 : CHT_WC_CHGDISCTRL_FN;
373 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL,
374 CHT_WC_CHGDISCTRL_FN, val);
375 if (ret)
376 dev_err(ext->dev,
377 "Error setting sw control for CHGDIS pin: %d\n",
378 ret);
379
380 mask = CHT_WC_CHGRCTRL0_SWCONTROL | CHT_WC_CHGRCTRL0_CCSM_OFF;
381 val = enable ? mask : 0;
382 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL0, mask, val);
383 if (ret)
384 dev_err(ext->dev, "Error setting sw control: %d\n", ret);
385
386 return ret;
387 }
388
cht_wc_extcon_find_role_sw(struct cht_wc_extcon_data * ext)389 static int cht_wc_extcon_find_role_sw(struct cht_wc_extcon_data *ext)
390 {
391 const struct software_node *swnode;
392 struct fwnode_handle *fwnode;
393
394 swnode = software_node_find_by_name(NULL, "intel-xhci-usb-sw");
395 if (!swnode)
396 return -EPROBE_DEFER;
397
398 fwnode = software_node_fwnode(swnode);
399 ext->role_sw = usb_role_switch_find_by_fwnode(fwnode);
400 fwnode_handle_put(fwnode);
401
402 return ext->role_sw ? 0 : -EPROBE_DEFER;
403 }
404
cht_wc_extcon_put_role_sw(void * data)405 static void cht_wc_extcon_put_role_sw(void *data)
406 {
407 struct cht_wc_extcon_data *ext = data;
408
409 usb_role_switch_put(ext->role_sw);
410 }
411
412 /* Some boards require controlling the role-sw and Vbus based on the id-pin */
cht_wc_extcon_get_role_sw_and_regulator(struct cht_wc_extcon_data * ext)413 static int cht_wc_extcon_get_role_sw_and_regulator(struct cht_wc_extcon_data *ext)
414 {
415 int ret;
416
417 ret = cht_wc_extcon_find_role_sw(ext);
418 if (ret)
419 return ret;
420
421 ret = devm_add_action_or_reset(ext->dev, cht_wc_extcon_put_role_sw, ext);
422 if (ret)
423 return ret;
424
425 /*
426 * On x86/ACPI platforms the regulator <-> consumer link is provided
427 * by platform_data passed to the regulator driver. This means that
428 * this info is not available before the regulator driver has bound.
429 * Use devm_regulator_get_optional() to avoid getting a dummy
430 * regulator and wait for the regulator to show up if necessary.
431 */
432 ext->vbus_boost = devm_regulator_get_optional(ext->dev, "vbus");
433 if (IS_ERR(ext->vbus_boost)) {
434 ret = PTR_ERR(ext->vbus_boost);
435 if (ret == -ENODEV)
436 ret = -EPROBE_DEFER;
437
438 return dev_err_probe(ext->dev, ret, "getting Vbus regulator");
439 }
440
441 return 0;
442 }
443
cht_wc_extcon_psy_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)444 static int cht_wc_extcon_psy_get_prop(struct power_supply *psy,
445 enum power_supply_property psp,
446 union power_supply_propval *val)
447 {
448 struct cht_wc_extcon_data *ext = power_supply_get_drvdata(psy);
449
450 switch (psp) {
451 case POWER_SUPPLY_PROP_USB_TYPE:
452 val->intval = ext->usb_type;
453 break;
454 case POWER_SUPPLY_PROP_ONLINE:
455 val->intval = ext->usb_type ? 1 : 0;
456 break;
457 default:
458 return -EINVAL;
459 }
460
461 return 0;
462 }
463
464 static const enum power_supply_usb_type cht_wc_extcon_psy_usb_types[] = {
465 POWER_SUPPLY_USB_TYPE_SDP,
466 POWER_SUPPLY_USB_TYPE_CDP,
467 POWER_SUPPLY_USB_TYPE_DCP,
468 POWER_SUPPLY_USB_TYPE_ACA,
469 POWER_SUPPLY_USB_TYPE_UNKNOWN,
470 };
471
472 static const enum power_supply_property cht_wc_extcon_psy_props[] = {
473 POWER_SUPPLY_PROP_USB_TYPE,
474 POWER_SUPPLY_PROP_ONLINE,
475 };
476
477 static const struct power_supply_desc cht_wc_extcon_psy_desc = {
478 .name = "cht_wcove_pwrsrc",
479 .type = POWER_SUPPLY_TYPE_USB,
480 .usb_types = cht_wc_extcon_psy_usb_types,
481 .num_usb_types = ARRAY_SIZE(cht_wc_extcon_psy_usb_types),
482 .properties = cht_wc_extcon_psy_props,
483 .num_properties = ARRAY_SIZE(cht_wc_extcon_psy_props),
484 .get_property = cht_wc_extcon_psy_get_prop,
485 };
486
cht_wc_extcon_register_psy(struct cht_wc_extcon_data * ext)487 static int cht_wc_extcon_register_psy(struct cht_wc_extcon_data *ext)
488 {
489 struct power_supply_config psy_cfg = { .drv_data = ext };
490
491 ext->psy = devm_power_supply_register(ext->dev,
492 &cht_wc_extcon_psy_desc,
493 &psy_cfg);
494 return PTR_ERR_OR_ZERO(ext->psy);
495 }
496
cht_wc_extcon_probe(struct platform_device * pdev)497 static int cht_wc_extcon_probe(struct platform_device *pdev)
498 {
499 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
500 struct cht_wc_extcon_data *ext;
501 unsigned long mask = ~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_USBID_MASK);
502 int pwrsrc_sts, id;
503 int irq, ret;
504
505 irq = platform_get_irq(pdev, 0);
506 if (irq < 0)
507 return irq;
508
509 ext = devm_kzalloc(&pdev->dev, sizeof(*ext), GFP_KERNEL);
510 if (!ext)
511 return -ENOMEM;
512
513 ext->dev = &pdev->dev;
514 ext->regmap = pmic->regmap;
515 ext->previous_cable = EXTCON_NONE;
516
517 /* Initialize extcon device */
518 ext->edev = devm_extcon_dev_allocate(ext->dev, cht_wc_extcon_cables);
519 if (IS_ERR(ext->edev))
520 return PTR_ERR(ext->edev);
521
522 switch (pmic->cht_wc_model) {
523 case INTEL_CHT_WC_GPD_WIN_POCKET:
524 /*
525 * When a host-cable is detected the BIOS enables an external 5v boost
526 * converter to power connected devices there are 2 problems with this:
527 * 1) This gets seen by the external battery charger as a valid Vbus
528 * supply and it then tries to feed Vsys from this creating a
529 * feedback loop which causes aprox. 300 mA extra battery drain
530 * (and unless we drive the external-charger-disable pin high it
531 * also tries to charge the battery causing even more feedback).
532 * 2) This gets seen by the pwrsrc block as a SDP USB Vbus supply
533 * Since the external battery charger has its own 5v boost converter
534 * which does not have these issues, we simply turn the separate
535 * external 5v boost converter off and leave it off entirely.
536 */
537 cht_wc_extcon_set_5v_boost(ext, false);
538 break;
539 case INTEL_CHT_WC_LENOVO_YOGABOOK1:
540 case INTEL_CHT_WC_LENOVO_YT3_X90:
541 /* Do this first, as it may very well return -EPROBE_DEFER. */
542 ret = cht_wc_extcon_get_role_sw_and_regulator(ext);
543 if (ret)
544 return ret;
545 /*
546 * The bq25890 used here relies on this driver's BC-1.2 charger
547 * detection, and the bq25890 driver expect this info to be
548 * available through a parent power_supply class device which
549 * models the detected charger (idem to how the Type-C TCPM code
550 * registers a power_supply classdev for the connected charger).
551 */
552 ret = cht_wc_extcon_register_psy(ext);
553 if (ret)
554 return ret;
555 break;
556 case INTEL_CHT_WC_XIAOMI_MIPAD2:
557 ret = cht_wc_extcon_get_role_sw_and_regulator(ext);
558 if (ret)
559 return ret;
560 break;
561 default:
562 break;
563 }
564
565 /* Enable sw control */
566 ret = cht_wc_extcon_sw_control(ext, true);
567 if (ret)
568 goto disable_sw_control;
569
570 /* Disable charging by external battery charger */
571 cht_wc_extcon_enable_charging(ext, false);
572
573 /* Register extcon device */
574 ret = devm_extcon_dev_register(ext->dev, ext->edev);
575 if (ret) {
576 dev_err(ext->dev, "Error registering extcon device: %d\n", ret);
577 goto disable_sw_control;
578 }
579
580 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
581 if (ret) {
582 dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);
583 goto disable_sw_control;
584 }
585
586 /*
587 * If no USB host or device connected, route D+ and D- to PMIC for
588 * initial charger detection
589 */
590 id = cht_wc_extcon_get_id(ext, pwrsrc_sts);
591 if (id != INTEL_USB_ID_GND)
592 cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);
593
594 /* Get initial state */
595 cht_wc_extcon_pwrsrc_event(ext);
596
597 ret = devm_request_threaded_irq(ext->dev, irq, NULL, cht_wc_extcon_isr,
598 IRQF_ONESHOT, pdev->name, ext);
599 if (ret) {
600 dev_err(ext->dev, "Error requesting interrupt: %d\n", ret);
601 goto disable_sw_control;
602 }
603
604 /* Unmask irqs */
605 ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, mask);
606 if (ret) {
607 dev_err(ext->dev, "Error writing irq-mask: %d\n", ret);
608 goto disable_sw_control;
609 }
610
611 platform_set_drvdata(pdev, ext);
612
613 return 0;
614
615 disable_sw_control:
616 cht_wc_extcon_sw_control(ext, false);
617 return ret;
618 }
619
cht_wc_extcon_remove(struct platform_device * pdev)620 static int cht_wc_extcon_remove(struct platform_device *pdev)
621 {
622 struct cht_wc_extcon_data *ext = platform_get_drvdata(pdev);
623
624 cht_wc_extcon_sw_control(ext, false);
625
626 return 0;
627 }
628
629 static const struct platform_device_id cht_wc_extcon_table[] = {
630 { .name = "cht_wcove_pwrsrc" },
631 {},
632 };
633 MODULE_DEVICE_TABLE(platform, cht_wc_extcon_table);
634
635 static struct platform_driver cht_wc_extcon_driver = {
636 .probe = cht_wc_extcon_probe,
637 .remove = cht_wc_extcon_remove,
638 .id_table = cht_wc_extcon_table,
639 .driver = {
640 .name = "cht_wcove_pwrsrc",
641 },
642 };
643 module_platform_driver(cht_wc_extcon_driver);
644
645 MODULE_DESCRIPTION("Intel Cherrytrail Whiskey Cove PMIC extcon driver");
646 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
647 MODULE_LICENSE("GPL v2");
648