1 // SPDX-License-Identifier: GPL-2.0
3  * Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC
7  * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
10 #include <linux/extcon-provider.h>
20 #include "extcon-intel.h"
63 /* 0 - open drain, 1 - regular push-pull output */
65 /* 0 - pin is controlled by SW, 1 - by HW */
132 	/* Charger detection can take upto 600ms, wait 800ms max. */  in cht_wc_extcon_get_charger()
135 		ret = regmap_read(ext->regmap, CHT_WC_USBSRC, &usbsrc);  in cht_wc_extcon_get_charger()
137 			dev_err(ext->dev, "Error reading usbsrc: %d\n", ret);  in cht_wc_extcon_get_charger()
154 			dev_warn(ext->dev, "Could not detect charger type\n");  in cht_wc_extcon_get_charger()
156 			dev_warn(ext->dev, "Timeout detecting charger type\n");  in cht_wc_extcon_get_charger()
163 		dev_warn(ext->dev,  in cht_wc_extcon_get_charger()
164 			"Unhandled charger type %d, defaulting to SDP\n",  in cht_wc_extcon_get_charger()
186 	ret = regmap_write(ext->regmap, CHT_WC_PHYCTRL, state);  in cht_wc_extcon_set_phymux()
188 		dev_err(ext->dev, "Error writing phyctrl: %d\n", ret);  in cht_wc_extcon_set_phymux()
197 	 * The 5V boost converter is enabled through a gpio on the PMIC, since  in cht_wc_extcon_set_5v_boost()
198 	 * there currently is no gpio driver we access the gpio reg directly.  in cht_wc_extcon_set_5v_boost()
204 	ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val);  in cht_wc_extcon_set_5v_boost()
206 		dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret);  in cht_wc_extcon_set_5v_boost()
215 	ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL1,  in cht_wc_extcon_set_otgmode()
218 		dev_err(ext->dev, "Error updating CHGRCTRL1 reg: %d\n", ret);  in cht_wc_extcon_set_otgmode()
227 	ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL,  in cht_wc_extcon_enable_charging()
230 		dev_err(ext->dev, "Error updating CHGDISCTRL reg: %d\n", ret);  in cht_wc_extcon_enable_charging()
237 	extcon_set_state_sync(ext->edev, cable, state);  in cht_wc_extcon_set_state()
239 		extcon_set_state_sync(ext->edev, EXTCON_USB, state);  in cht_wc_extcon_set_state()
247 	bool ignore_get_charger_errors = ext->usb_host;  in cht_wc_extcon_pwrsrc_event()
249 	ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);  in cht_wc_extcon_pwrsrc_event()
251 		dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);  in cht_wc_extcon_pwrsrc_event()
267 	/* Plugged into a host/charger or not connected? */  in cht_wc_extcon_pwrsrc_event()
269 		/* Route D+ and D- to PMIC for future charger detection */  in cht_wc_extcon_pwrsrc_event()
279 	/* Route D+ and D- to SoC for the host or gadget controller */  in cht_wc_extcon_pwrsrc_event()
283 	if (cable != ext->previous_cable) {  in cht_wc_extcon_pwrsrc_event()
285 		cht_wc_extcon_set_state(ext, ext->previous_cable, false);  in cht_wc_extcon_pwrsrc_event()
286 		ext->previous_cable = cable;  in cht_wc_extcon_pwrsrc_event()
289 	ext->usb_host = ((id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A));  in cht_wc_extcon_pwrsrc_event()
290 	extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host);  in cht_wc_extcon_pwrsrc_event()
298 	ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_IRQ, &irqs);  in cht_wc_extcon_isr()
300 		dev_err(ext->dev, "Error reading irqs: %d\n", ret);  in cht_wc_extcon_isr()
306 	ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ, irqs);  in cht_wc_extcon_isr()
308 		dev_err(ext->dev, "Error writing irqs: %d\n", ret);  in cht_wc_extcon_isr()
320 	ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL,  in cht_wc_extcon_sw_control()
323 		dev_err(ext->dev,  in cht_wc_extcon_sw_control()
329 	ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL0, mask, val);  in cht_wc_extcon_sw_control()
331 		dev_err(ext->dev, "Error setting sw control: %d\n", ret);  in cht_wc_extcon_sw_control()
338 	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);  in cht_wc_extcon_probe()
348 	ext = devm_kzalloc(&pdev->dev, sizeof(*ext), GFP_KERNEL);  in cht_wc_extcon_probe()
350 		return -ENOMEM;  in cht_wc_extcon_probe()
352 	ext->dev = &pdev->dev;  in cht_wc_extcon_probe()
353 	ext->regmap = pmic->regmap;  in cht_wc_extcon_probe()
354 	ext->previous_cable = EXTCON_NONE;  in cht_wc_extcon_probe()
357 	ext->edev = devm_extcon_dev_allocate(ext->dev, cht_wc_extcon_cables);  in cht_wc_extcon_probe()
358 	if (IS_ERR(ext->edev))  in cht_wc_extcon_probe()
359 		return PTR_ERR(ext->edev);  in cht_wc_extcon_probe()
362 	 * When a host-cable is detected the BIOS enables an external 5v boost  in cht_wc_extcon_probe()
364 	 * 1) This gets seen by the external battery charger as a valid Vbus  in cht_wc_extcon_probe()
367 	 *    (and unless we drive the external-charger-disable pin high it  in cht_wc_extcon_probe()
370 	 * Since the external battery charger has its own 5v boost converter  in cht_wc_extcon_probe()
381 	/* Disable charging by external battery charger */  in cht_wc_extcon_probe()
385 	ret = devm_extcon_dev_register(ext->dev, ext->edev);  in cht_wc_extcon_probe()
387 		dev_err(ext->dev, "Error registering extcon device: %d\n", ret);  in cht_wc_extcon_probe()
391 	ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);  in cht_wc_extcon_probe()
393 		dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);  in cht_wc_extcon_probe()
398 	 * If no USB host or device connected, route D+ and D- to PMIC for  in cht_wc_extcon_probe()
399 	 * initial charger detection  in cht_wc_extcon_probe()
408 	ret = devm_request_threaded_irq(ext->dev, irq, NULL, cht_wc_extcon_isr,  in cht_wc_extcon_probe()
409 					IRQF_ONESHOT, pdev->name, ext);  in cht_wc_extcon_probe()
411 		dev_err(ext->dev, "Error requesting interrupt: %d\n", ret);  in cht_wc_extcon_probe()
416 	ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, mask);  in cht_wc_extcon_probe()
418 		dev_err(ext->dev, "Error writing irq-mask: %d\n", ret);  in cht_wc_extcon_probe()