[mirror_ubuntu-artful-kernel.git] / drivers / extcon / extcon-axp288.c

/*
 * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
 *
 * Copyright (C) 2015 Intel Corporation
 * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/notifier.h>
#include <linux/extcon.h>
#include <linux/regmap.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/mfd/axp20x.h>

/* Power source status register */
#define PS_STAT_VBUS_TRIGGER		BIT(0)
#define PS_STAT_BAT_CHRG_DIR		BIT(2)
#define PS_STAT_VBUS_ABOVE_VHOLD	BIT(3)
#define PS_STAT_VBUS_VALID		BIT(4)
#define PS_STAT_VBUS_PRESENT		BIT(5)

/* BC module global register */
#define BC_GLOBAL_RUN			BIT(0)
#define BC_GLOBAL_DET_STAT		BIT(2)
#define BC_GLOBAL_DBP_TOUT		BIT(3)
#define BC_GLOBAL_VLGC_COM_SEL		BIT(4)
#define BC_GLOBAL_DCD_TOUT_MASK		(BIT(6)|BIT(5))
#define BC_GLOBAL_DCD_TOUT_300MS	0
#define BC_GLOBAL_DCD_TOUT_100MS	1
#define BC_GLOBAL_DCD_TOUT_500MS	2
#define BC_GLOBAL_DCD_TOUT_900MS	3
#define BC_GLOBAL_DCD_DET_SEL		BIT(7)

/* BC module vbus control and status register */
#define VBUS_CNTL_DPDM_PD_EN		BIT(4)
#define VBUS_CNTL_DPDM_FD_EN		BIT(5)
#define VBUS_CNTL_FIRST_PO_STAT		BIT(6)

/* BC USB status register */
#define USB_STAT_BUS_STAT_MASK		(BIT(3)|BIT(2)|BIT(1)|BIT(0))
#define USB_STAT_BUS_STAT_SHIFT		0
#define USB_STAT_BUS_STAT_ATHD		0
#define USB_STAT_BUS_STAT_CONN		1
#define USB_STAT_BUS_STAT_SUSP		2
#define USB_STAT_BUS_STAT_CONF		3
#define USB_STAT_USB_SS_MODE		BIT(4)
#define USB_STAT_DEAD_BAT_DET		BIT(6)
#define USB_STAT_DBP_UNCFG		BIT(7)

/* BC detect status register */
#define DET_STAT_MASK			(BIT(7)|BIT(6)|BIT(5))
#define DET_STAT_SHIFT			5
#define DET_STAT_SDP			1
#define DET_STAT_CDP			2
#define DET_STAT_DCP			3

/* IRQ enable-1 register */
#define PWRSRC_IRQ_CFG_MASK		(BIT(4)|BIT(3)|BIT(2))

/* IRQ enable-6 register */
#define BC12_IRQ_CFG_MASK		BIT(1)

enum axp288_extcon_reg {
	AXP288_PS_STAT_REG		= 0x00,
	AXP288_PS_BOOT_REASON_REG	= 0x02,
	AXP288_BC_GLOBAL_REG		= 0x2c,
	AXP288_BC_VBUS_CNTL_REG		= 0x2d,
	AXP288_BC_USB_STAT_REG		= 0x2e,
	AXP288_BC_DET_STAT_REG		= 0x2f,
	AXP288_PWRSRC_IRQ_CFG_REG	= 0x40,
	AXP288_BC12_IRQ_CFG_REG		= 0x45,
};

enum axp288_mux_select {
	EXTCON_GPIO_MUX_SEL_PMIC = 0,
	EXTCON_GPIO_MUX_SEL_SOC,
};

enum axp288_extcon_irq {
	VBUS_FALLING_IRQ = 0,
	VBUS_RISING_IRQ,
	MV_CHNG_IRQ,
	BC_USB_CHNG_IRQ,
	EXTCON_IRQ_END,
};

static const unsigned int axp288_extcon_cables[] = {
	EXTCON_CHG_USB_SDP,
	EXTCON_CHG_USB_CDP,
	EXTCON_CHG_USB_DCP,
	EXTCON_NONE,
};

struct axp288_extcon_info {
	struct device *dev;
	struct regmap *regmap;
	struct regmap_irq_chip_data *regmap_irqc;
	struct gpio_desc *gpio_mux_cntl;
	int irq[EXTCON_IRQ_END];
	struct extcon_dev *edev;
	struct notifier_block extcon_nb;
	unsigned int previous_cable;
};

/* Power up/down reason string array */
static char *axp288_pwr_up_down_info[] = {
	"Last wake caused by user pressing the power button",
	"Last wake caused by a charger insertion",
	"Last wake caused by a battery insertion",
	"Last wake caused by SOC initiated global reset",
	"Last wake caused by cold reset",
	"Last shutdown caused by PMIC UVLO threshold",
	"Last shutdown caused by SOC initiated cold off",
	"Last shutdown caused by user pressing the power button",
	NULL,
};

/*
 * Decode and log the given "reset source indicator" (rsi)
 * register and then clear it.
 */
static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
{
	char **rsi;
	unsigned int val, i, clear_mask = 0;
	int ret;

	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
	for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
		if (val & BIT(i)) {
			dev_dbg(info->dev, "%s\n", *rsi);
			clear_mask |= BIT(i);
		}
	}

	/* Clear the register value for next reboot (write 1 to clear bit) */
	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
}

static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
{
	int ret, stat, cfg, pwr_stat;
	u8 chrg_type;
	unsigned int cable = info->previous_cable;
	bool vbus_attach = false;

	ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
	if (ret < 0) {
		dev_err(info->dev, "failed to read vbus status\n");
		return ret;
	}

	vbus_attach = (pwr_stat & PS_STAT_VBUS_VALID);
	if (!vbus_attach)
		goto no_vbus;

	/* Check charger detection completion status */
	ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
	if (ret < 0)
		goto dev_det_ret;
	if (cfg & BC_GLOBAL_DET_STAT) {
		dev_dbg(info->dev, "can't complete the charger detection\n");
		goto dev_det_ret;
	}

	ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
	if (ret < 0)
		goto dev_det_ret;

	chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;

	switch (chrg_type) {
	case DET_STAT_SDP:
		dev_dbg(info->dev, "sdp cable is connected\n");
		cable = EXTCON_CHG_USB_SDP;
		break;
	case DET_STAT_CDP:
		dev_dbg(info->dev, "cdp cable is connected\n");
		cable = EXTCON_CHG_USB_CDP;
		break;
	case DET_STAT_DCP:
		dev_dbg(info->dev, "dcp cable is connected\n");
		cable = EXTCON_CHG_USB_DCP;
		break;
	default:
		dev_warn(info->dev,
			"disconnect or unknown or ID event\n");
	}

no_vbus:
	/*
	 * If VBUS is absent Connect D+/D- lines to PMIC for BC
	 * detection. Else connect them to SOC for USB communication.
	 */
	if (info->gpio_mux_cntl)
		gpiod_set_value(info->gpio_mux_cntl,
			vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
					: EXTCON_GPIO_MUX_SEL_PMIC);

	extcon_set_state_sync(info->edev, info->previous_cable, false);
	if (vbus_attach) {
		extcon_set_state_sync(info->edev, cable, vbus_attach);
		info->previous_cable = cable;
	}

	return 0;

dev_det_ret:
	if (ret < 0)
		dev_err(info->dev, "failed to detect BC Mod\n");

	return ret;
}

static irqreturn_t axp288_extcon_isr(int irq, void *data)
{
	struct axp288_extcon_info *info = data;
	int ret;

	ret = axp288_handle_chrg_det_event(info);
	if (ret < 0)
		dev_err(info->dev, "failed to handle the interrupt\n");

	return IRQ_HANDLED;
}

static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
{
	/* Unmask VBUS interrupt */
	regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
						PWRSRC_IRQ_CFG_MASK);
	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
						BC_GLOBAL_RUN, 0);
	/* Unmask the BC1.2 complete interrupts */
	regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
	/* Enable the charger detection logic */
	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
					BC_GLOBAL_RUN, BC_GLOBAL_RUN);
}

static int axp288_extcon_probe(struct platform_device *pdev)
{
	struct axp288_extcon_info *info;
	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
	struct axp288_extcon_pdata *pdata = pdev->dev.platform_data;
	int ret, i, pirq, gpio;

	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->dev = &pdev->dev;
	info->regmap = axp20x->regmap;
	info->regmap_irqc = axp20x->regmap_irqc;
	info->previous_cable = EXTCON_NONE;
	if (pdata)
		info->gpio_mux_cntl = pdata->gpio_mux_cntl;

	platform_set_drvdata(pdev, info);

	axp288_extcon_log_rsi(info);

	/* Initialize extcon device */
	info->edev = devm_extcon_dev_allocate(&pdev->dev,
					      axp288_extcon_cables);
	if (IS_ERR(info->edev)) {
		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
		return PTR_ERR(info->edev);
	}

	/* Register extcon device */
	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
	if (ret) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		return ret;
	}

	/* Set up gpio control for USB Mux */
	if (info->gpio_mux_cntl) {
		gpio = desc_to_gpio(info->gpio_mux_cntl);
		ret = devm_gpio_request(&pdev->dev, gpio, "USB_MUX");
		if (ret < 0) {
			dev_err(&pdev->dev,
				"failed to request the gpio=%d\n", gpio);
			return ret;
		}
		gpiod_direction_output(info->gpio_mux_cntl,
						EXTCON_GPIO_MUX_SEL_PMIC);
	}

	for (i = 0; i < EXTCON_IRQ_END; i++) {
		pirq = platform_get_irq(pdev, i);
		info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
		if (info->irq[i] < 0) {
			dev_err(&pdev->dev,
				"failed to get virtual interrupt=%d\n", pirq);
			ret = info->irq[i];
			return ret;
		}

		ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
				NULL, axp288_extcon_isr,
				IRQF_ONESHOT | IRQF_NO_SUSPEND,
				pdev->name, info);
		if (ret) {
			dev_err(&pdev->dev, "failed to request interrupt=%d\n",
							info->irq[i]);
			return ret;
		}
	}

	/* Enable interrupts */
	axp288_extcon_enable_irq(info);

	return 0;
}

static struct platform_driver axp288_extcon_driver = {
	.probe = axp288_extcon_probe,
	.driver = {
		.name = "axp288_extcon",
	},
};
module_platform_driver(axp288_extcon_driver);

MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f0312378 RP	1	/*
	2	* extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
	3	*
	4	* Copyright (C) 2015 Intel Corporation
	5	* Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/kernel.h>
	19	#include <linux/io.h>
	20	#include <linux/slab.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/property.h>
f0312378 RP	24	#include <linux/notifier.h>
	25	#include <linux/extcon.h>
	26	#include <linux/regmap.h>
	27	#include <linux/gpio.h>
	28	#include <linux/gpio/consumer.h>
	29	#include <linux/mfd/axp20x.h>
	30
	31	/* Power source status register */
	32	#define PS_STAT_VBUS_TRIGGER BIT(0)
	33	#define PS_STAT_BAT_CHRG_DIR BIT(2)
	34	#define PS_STAT_VBUS_ABOVE_VHOLD BIT(3)
	35	#define PS_STAT_VBUS_VALID BIT(4)
	36	#define PS_STAT_VBUS_PRESENT BIT(5)
	37
	38	/* BC module global register */
	39	#define BC_GLOBAL_RUN BIT(0)
	40	#define BC_GLOBAL_DET_STAT BIT(2)
	41	#define BC_GLOBAL_DBP_TOUT BIT(3)
	42	#define BC_GLOBAL_VLGC_COM_SEL BIT(4)
	43	#define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)\|BIT(5))
	44	#define BC_GLOBAL_DCD_TOUT_300MS 0
	45	#define BC_GLOBAL_DCD_TOUT_100MS 1
	46	#define BC_GLOBAL_DCD_TOUT_500MS 2
	47	#define BC_GLOBAL_DCD_TOUT_900MS 3
	48	#define BC_GLOBAL_DCD_DET_SEL BIT(7)
	49
	50	/* BC module vbus control and status register */
	51	#define VBUS_CNTL_DPDM_PD_EN BIT(4)
	52	#define VBUS_CNTL_DPDM_FD_EN BIT(5)
	53	#define VBUS_CNTL_FIRST_PO_STAT BIT(6)
	54
	55	/* BC USB status register */
	56	#define USB_STAT_BUS_STAT_MASK (BIT(3)\|BIT(2)\|BIT(1)\|BIT(0))
	57	#define USB_STAT_BUS_STAT_SHIFT 0
	58	#define USB_STAT_BUS_STAT_ATHD 0
	59	#define USB_STAT_BUS_STAT_CONN 1
	60	#define USB_STAT_BUS_STAT_SUSP 2
	61	#define USB_STAT_BUS_STAT_CONF 3
	62	#define USB_STAT_USB_SS_MODE BIT(4)
	63	#define USB_STAT_DEAD_BAT_DET BIT(6)
	64	#define USB_STAT_DBP_UNCFG BIT(7)
	65
	66	/* BC detect status register */
	67	#define DET_STAT_MASK (BIT(7)\|BIT(6)\|BIT(5))
	68	#define DET_STAT_SHIFT 5
	69	#define DET_STAT_SDP 1
	70	#define DET_STAT_CDP 2
	71	#define DET_STAT_DCP 3
	72
	73	/* IRQ enable-1 register */
	74	#define PWRSRC_IRQ_CFG_MASK (BIT(4)\|BIT(3)\|BIT(2))
	75
	76	/* IRQ enable-6 register */
	77	#define BC12_IRQ_CFG_MASK BIT(1)
	78
f0312378 RP	79	enum axp288_extcon_reg {
	80	AXP288_PS_STAT_REG = 0x00,
	81	AXP288_PS_BOOT_REASON_REG = 0x02,
	82	AXP288_BC_GLOBAL_REG = 0x2c,
	83	AXP288_BC_VBUS_CNTL_REG = 0x2d,
	84	AXP288_BC_USB_STAT_REG = 0x2e,
	85	AXP288_BC_DET_STAT_REG = 0x2f,
	86	AXP288_PWRSRC_IRQ_CFG_REG = 0x40,
	87	AXP288_BC12_IRQ_CFG_REG = 0x45,
	88	};
	89
	90	enum axp288_mux_select {
	91	EXTCON_GPIO_MUX_SEL_PMIC = 0,
	92	EXTCON_GPIO_MUX_SEL_SOC,
	93	};
	94
	95	enum axp288_extcon_irq {
	96	VBUS_FALLING_IRQ = 0,
	97	VBUS_RISING_IRQ,
	98	MV_CHNG_IRQ,
	99	BC_USB_CHNG_IRQ,
	100	EXTCON_IRQ_END,
	101	};
	102
73b6ecdb	103	static const unsigned int axp288_extcon_cables[] = {
11eecf91 CC	104	EXTCON_CHG_USB_SDP,
	105	EXTCON_CHG_USB_CDP,
	106	EXTCON_CHG_USB_DCP,
2a9de9c0	107	EXTCON_NONE,
f0312378 RP	108	};
	109
	110	struct axp288_extcon_info {
	111	struct device *dev;
	112	struct regmap *regmap;
	113	struct regmap_irq_chip_data *regmap_irqc;
76884241	114	struct gpio_desc *gpio_mux_cntl;
f0312378 RP	115	int irq[EXTCON_IRQ_END];
	116	struct extcon_dev *edev;
	117	struct notifier_block extcon_nb;
5d2199ea	118	unsigned int previous_cable;
f0312378 RP	119	};
	120
	121	/* Power up/down reason string array */
	122	static char *axp288_pwr_up_down_info[] = {
	123	"Last wake caused by user pressing the power button",
	124	"Last wake caused by a charger insertion",
	125	"Last wake caused by a battery insertion",
	126	"Last wake caused by SOC initiated global reset",
	127	"Last wake caused by cold reset",
	128	"Last shutdown caused by PMIC UVLO threshold",
	129	"Last shutdown caused by SOC initiated cold off",
	130	"Last shutdown caused by user pressing the power button",
	131	NULL,
	132	};
	133
	134	/*
	135	* Decode and log the given "reset source indicator" (rsi)
	136	* register and then clear it.
	137	*/
	138	static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
	139	{
	140	char **rsi;
	141	unsigned int val, i, clear_mask = 0;
	142	int ret;
	143
	144	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
	145	for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
	146	if (val & BIT(i)) {
	147	dev_dbg(info->dev, "%s\n", *rsi);
	148	clear_mask \|= BIT(i);
	149	}
	150	}
	151
	152	/* Clear the register value for next reboot (write 1 to clear bit) */
	153	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
	154	}
	155
	156	static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
	157	{
f0312378 RP	158	int ret, stat, cfg, pwr_stat;
f0312378 RP	159	u8 chrg_type;
5d2199ea	160	unsigned int cable = info->previous_cable;
f0312378 RP	161	bool vbus_attach = false;
	162
	163	ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
	164	if (ret < 0) {
	165	dev_err(info->dev, "failed to read vbus status\n");
	166	return ret;
	167	}
	168
5757aca1	169	vbus_attach = (pwr_stat & PS_STAT_VBUS_VALID);
f0312378	170	if (!vbus_attach)
3fe1e0e2	171	goto no_vbus;
f0312378 RP	172
	173	/* Check charger detection completion status */
	174	ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
	175	if (ret < 0)
	176	goto dev_det_ret;
	177	if (cfg & BC_GLOBAL_DET_STAT) {
	178	dev_dbg(info->dev, "can't complete the charger detection\n");
	179	goto dev_det_ret;
	180	}
	181
	182	ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
	183	if (ret < 0)
	184	goto dev_det_ret;
	185
	186	chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
	187
	188	switch (chrg_type) {
	189	case DET_STAT_SDP:
525867db	190	dev_dbg(info->dev, "sdp cable is connected\n");
11eecf91	191	cable = EXTCON_CHG_USB_SDP;
f0312378 RP	192	break;
f0312378 RP	193	case DET_STAT_CDP:
525867db	194	dev_dbg(info->dev, "cdp cable is connected\n");
11eecf91	195	cable = EXTCON_CHG_USB_CDP;
f0312378 RP	196	break;
f0312378 RP	197	case DET_STAT_DCP:
525867db	198	dev_dbg(info->dev, "dcp cable is connected\n");
11eecf91	199	cable = EXTCON_CHG_USB_DCP;
f0312378 RP	200	break;
	201	default:
	202	dev_warn(info->dev,
	203	"disconnect or unknown or ID event\n");
	204	}
	205
3fe1e0e2 HG	206	no_vbus:
	207	/*
	208	* If VBUS is absent Connect D+/D- lines to PMIC for BC
	209	* detection. Else connect them to SOC for USB communication.
	210	*/
	211	if (info->gpio_mux_cntl)
	212	gpiod_set_value(info->gpio_mux_cntl,
	213	vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
	214	: EXTCON_GPIO_MUX_SEL_PMIC);
	215
5d2199ea HG	216	extcon_set_state_sync(info->edev, info->previous_cable, false);
	217	if (vbus_attach) {
	218	extcon_set_state_sync(info->edev, cable, vbus_attach);
	219	info->previous_cable = cable;
	220	}
f0312378 RP	221
	222	return 0;
	223
	224	dev_det_ret:
	225	if (ret < 0)
	226	dev_err(info->dev, "failed to detect BC Mod\n");
	227
	228	return ret;
	229	}
	230
	231	static irqreturn_t axp288_extcon_isr(int irq, void *data)
	232	{
	233	struct axp288_extcon_info *info = data;
	234	int ret;
	235
	236	ret = axp288_handle_chrg_det_event(info);
	237	if (ret < 0)
	238	dev_err(info->dev, "failed to handle the interrupt\n");
	239
	240	return IRQ_HANDLED;
	241	}
	242
	243	static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
	244	{
	245	/* Unmask VBUS interrupt */
	246	regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
	247	PWRSRC_IRQ_CFG_MASK);
	248	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
	249	BC_GLOBAL_RUN, 0);
	250	/* Unmask the BC1.2 complete interrupts */
	251	regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
	252	/* Enable the charger detection logic */
	253	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
	254	BC_GLOBAL_RUN, BC_GLOBAL_RUN);
	255	}
	256
	257	static int axp288_extcon_probe(struct platform_device *pdev)
	258	{
	259	struct axp288_extcon_info *info;
	260	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
76884241	261	struct axp288_extcon_pdata *pdata = pdev->dev.platform_data;
f0312378 RP	262	int ret, i, pirq, gpio;
	263
	264	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	265	if (!info)
	266	return -ENOMEM;
	267
	268	info->dev = &pdev->dev;
	269	info->regmap = axp20x->regmap;
	270	info->regmap_irqc = axp20x->regmap_irqc;
5d2199ea	271	info->previous_cable = EXTCON_NONE;
76884241 HG	272	if (pdata)
	273	info->gpio_mux_cntl = pdata->gpio_mux_cntl;
	274
f0312378 RP	275	platform_set_drvdata(pdev, info);
	276
	277	axp288_extcon_log_rsi(info);
	278
	279	/* Initialize extcon device */
	280	info->edev = devm_extcon_dev_allocate(&pdev->dev,
	281	axp288_extcon_cables);
	282	if (IS_ERR(info->edev)) {
	283	dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
	284	return PTR_ERR(info->edev);
	285	}
	286
	287	/* Register extcon device */
	288	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
	289	if (ret) {
	290	dev_err(&pdev->dev, "failed to register extcon device\n");
	291	return ret;
	292	}
	293
f0312378	294	/* Set up gpio control for USB Mux */
76884241 HG	295	if (info->gpio_mux_cntl) {
76884241 HG	296	gpio = desc_to_gpio(info->gpio_mux_cntl);
4bf27b70	297	ret = devm_gpio_request(&pdev->dev, gpio, "USB_MUX");
f0312378 RP	298	if (ret < 0) {
	299	dev_err(&pdev->dev,
	300	"failed to request the gpio=%d\n", gpio);
4bf27b70	301	return ret;
f0312378	302	}
76884241	303	gpiod_direction_output(info->gpio_mux_cntl,
f0312378 RP	304	EXTCON_GPIO_MUX_SEL_PMIC);
	305	}
	306
	307	for (i = 0; i < EXTCON_IRQ_END; i++) {
	308	pirq = platform_get_irq(pdev, i);
	309	info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
	310	if (info->irq[i] < 0) {
	311	dev_err(&pdev->dev,
	312	"failed to get virtual interrupt=%d\n", pirq);
	313	ret = info->irq[i];
4bf27b70	314	return ret;
f0312378 RP	315	}
	316
	317	ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
	318	NULL, axp288_extcon_isr,
	319	IRQF_ONESHOT \| IRQF_NO_SUSPEND,
	320	pdev->name, info);
	321	if (ret) {
	322	dev_err(&pdev->dev, "failed to request interrupt=%d\n",
	323	info->irq[i]);
4bf27b70	324	return ret;
f0312378 RP	325	}
	326	}
	327
	328	/* Enable interrupts */
	329	axp288_extcon_enable_irq(info);
	330
	331	return 0;
f0312378 RP	332	}
	333
	334	static struct platform_driver axp288_extcon_driver = {
	335	.probe = axp288_extcon_probe,
f0312378 RP	336	.driver = {
	337	.name = "axp288_extcon",
	338	},
	339	};
	340	module_platform_driver(axp288_extcon_driver);
	341
	342	MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
	343	MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
	344	MODULE_LICENSE("GPL v2");