path: root/drivers/power/supply/bd70528-charger.c

// SPDX-License-Identifier: GPL-2.0-or-later
//
// Copyright (C) 2018 ROHM Semiconductors
//
// power-supply driver for ROHM BD70528 PMIC

/*
 * BD70528 charger HW state machine.
 *
 * The thermal shutdown state is not drawn. From any other state but
 * battery error and suspend it is possible to go to TSD/TMP states
 * if temperature is out of bounds.
 *
 *  CHG_RST = H
 *  or CHG_EN=L
 *  or (DCIN2_UVLO=L && DCIN1_UVLO=L)
 *  or (DCIN2_OVLO=H & DCIN1_UVKLO=L)
 *
 *  +--------------+         +--------------+
 *  |              |         |              |
 *  |  Any state   +-------> |    Suspend   |
 *  |              |         |              |
 *  +--------------+         +------+-------+
 *                                  |
 *  CHG_EN = H && BAT_DET = H &&    |
 *  No errors (temp, bat_ov, UVLO,  |
 *  OVLO...)                        |
 *                                  |
 *  BAT_OV or             +---------v----------+
 *  (DBAT && TTRI)        |                    |
 *      +-----------------+   Trickle Charge   | <---------------+
 *      |                 |                    |                 |
 *      |                 +-------+------------+                 |
 *      |                         |                              |
 *      |                         |     ^                        |
 *      |        V_BAT > VTRI_TH  |     |  VBAT < VTRI_TH - 50mV |
 *      |                         |     |                        |
 *      |                         v     |                        |
 *      |                               |                        |
 *      |     BAT_OV or      +----------+----+                   |
 *      |     (DBAT && TFST) |               |                   |
 *      |   +----------------+  Fast Charge  |                   |
 *      |   |                |               |                   |
 *      v   v                +----+----------+                   |
 *                                |                              |
 *+----------------+   ILIM_DET=L |    ^ ILIM_DET                |
 *|                |   & CV_DET=H |    | or CV_DET=L             |
 *|  Battery Error |   & VBAT >   |    | or VBAT < VRECHG_TH     |
 *|                |   VRECHG_TH  |    | or IBAT  > IFST/x       |
 *+----------------+   & IBAT <   |    |                         |
 *                     IFST/x     v    |                         |
 *       ^                             |                         |
 *       |                   +---------+-+                       |
 *       |                   |           |                       |
 *       +-------------------+  Top OFF  |                       |
 *  BAT_OV = H or            |           |                       |
 *  (DBAT && TFST)           +-----+-----+                       |
 *                                 |                             |
 *           Stay top-off for 15s  |                             |
 *                                 v                             |
 *                                                               |
 *                            +--------+                         |
 *                            |        |                         |
 *                            |  Done  +-------------------------+
 *                            |        |
 *                            +--------+   VBAT < VRECHG_TH
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/linear_range.h>

#define CHG_STAT_SUSPEND	0x0
#define CHG_STAT_TRICKLE	0x1
#define CHG_STAT_FAST		0x3
#define CHG_STAT_TOPOFF		0xe
#define CHG_STAT_DONE		0xf
#define CHG_STAT_OTP_TRICKLE	0x10
#define CHG_STAT_OTP_FAST	0x11
#define CHG_STAT_OTP_DONE	0x12
#define CHG_STAT_TSD_TRICKLE	0x20
#define CHG_STAT_TSD_FAST	0x21
#define CHG_STAT_TSD_TOPOFF	0x22
#define CHG_STAT_BAT_ERR	0x7f

static const char *bd70528_charger_model = "BD70528";
static const char *bd70528_charger_manufacturer = "ROHM Semiconductors";

#define BD_ERR_IRQ_HND(_name_, _wrn_)					\
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg)	\
{									\
	struct power_supply *psy = (struct power_supply *)arg;		\
									\
	power_supply_changed(psy);					\
	dev_err(&psy->dev, (_wrn_));					\
									\
	return IRQ_HANDLED;						\
}

#define BD_INFO_IRQ_HND(_name_, _wrn_)					\
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg)	\
{									\
	struct power_supply *psy = (struct power_supply *)arg;		\
									\
	power_supply_changed(psy);					\
	dev_dbg(&psy->dev, (_wrn_));					\
									\
	return IRQ_HANDLED;						\
}

#define BD_IRQ_HND(_name_) bd0528_##_name_##_interrupt

struct bd70528_psy {
	struct regmap *regmap;
	struct device *dev;
	struct power_supply *psy;
};

BD_ERR_IRQ_HND(BAT_OV_DET, "Battery overvoltage detected\n");
BD_ERR_IRQ_HND(DBAT_DET, "Dead battery detected\n");
BD_ERR_IRQ_HND(COLD_DET, "Battery cold\n");
BD_ERR_IRQ_HND(HOT_DET, "Battery hot\n");
BD_ERR_IRQ_HND(CHG_TSD, "Charger thermal shutdown\n");
BD_ERR_IRQ_HND(DCIN2_OV_DET, "DCIN2 overvoltage detected\n");

BD_INFO_IRQ_HND(BAT_OV_RES, "Battery voltage back to normal\n");
BD_INFO_IRQ_HND(COLD_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(HOT_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(BAT_RMV, "Battery removed\n");
BD_INFO_IRQ_HND(BAT_DET, "Battery detected\n");
BD_INFO_IRQ_HND(DCIN2_OV_RES, "DCIN2 voltage back to normal\n");
BD_INFO_IRQ_HND(DCIN2_RMV, "DCIN2 removed\n");
BD_INFO_IRQ_HND(DCIN2_DET, "DCIN2 detected\n");
BD_INFO_IRQ_HND(DCIN1_RMV, "DCIN1 removed\n");
BD_INFO_IRQ_HND(DCIN1_DET, "DCIN1 detected\n");

struct irq_name_pair {
	const char *n;
	irqreturn_t (*h)(int irq, void *arg);
};

static int bd70528_get_irqs(struct platform_device *pdev,
			    struct bd70528_psy *bdpsy)
{
	int irq, i, ret;
	unsigned int mask;
	static const struct irq_name_pair bd70528_chg_irqs[] = {
		{ .n = "bd70528-bat-ov-res", .h = BD_IRQ_HND(BAT_OV_RES) },
		{ .n = "bd70528-bat-ov-det", .h = BD_IRQ_HND(BAT_OV_DET) },
		{ .n = "bd70528-bat-dead", .h = BD_IRQ_HND(DBAT_DET) },
		{ .n = "bd70528-bat-warmed", .h = BD_IRQ_HND(COLD_RES) },
		{ .n = "bd70528-bat-cold", .h = BD_IRQ_HND(COLD_DET) },
		{ .n = "bd70528-bat-cooled", .h = BD_IRQ_HND(HOT_RES) },
		{ .n = "bd70528-bat-hot", .h = BD_IRQ_HND(HOT_DET) },
		{ .n = "bd70528-chg-tshd", .h = BD_IRQ_HND(CHG_TSD) },
		{ .n = "bd70528-bat-removed", .h = BD_IRQ_HND(BAT_RMV) },
		{ .n = "bd70528-bat-detected", .h = BD_IRQ_HND(BAT_DET) },
		{ .n = "bd70528-dcin2-ov-res", .h = BD_IRQ_HND(DCIN2_OV_RES) },
		{ .n = "bd70528-dcin2-ov-det", .h = BD_IRQ_HND(DCIN2_OV_DET) },
		{ .n = "bd70528-dcin2-removed", .h = BD_IRQ_HND(DCIN2_RMV) },
		{ .n = "bd70528-dcin2-detected", .h = BD_IRQ_HND(DCIN2_DET) },
		{ .n = "bd70528-dcin1-removed", .h = BD_IRQ_HND(DCIN1_RMV) },
		{ .n = "bd70528-dcin1-detected", .h = BD_IRQ_HND(DCIN1_DET) },
	};

	for (i = 0; i < ARRAY_SIZE(bd70528_chg_irqs); i++) {
		irq = platform_get_irq_byname(pdev, bd70528_chg_irqs[i].n);
		if (irq < 0) {
			dev_err(&pdev->dev, "Bad IRQ information for %s (%d)\n",
				bd70528_chg_irqs[i].n, irq);
			return irq;
		}
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
						bd70528_chg_irqs[i].h,
						IRQF_ONESHOT,
						bd70528_chg_irqs[i].n,
						bdpsy->psy);

		if (ret)
			return ret;
	}
	/*
	 * BD70528 irq controller is not touching the main mask register.
	 * So enable the charger block interrupts at main level. We can just
	 * leave them enabled as irq-controller should disable irqs
	 * from sub-registers when IRQ is disabled or freed.
	 */
	mask = BD70528_REG_INT_BAT1_MASK | BD70528_REG_INT_BAT2_MASK;
	ret = regmap_update_bits(bdpsy->regmap,
				 BD70528_REG_INT_MAIN_MASK, mask, 0);
	if (ret)
		dev_err(&pdev->dev, "Failed to enable charger IRQs\n");

	return ret;
}

static int bd70528_get_charger_status(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CURR_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "Charger state read failure %d\n",
			ret);
		return ret;
	}

	switch (v & BD70528_MASK_CHG_STAT) {
	case CHG_STAT_SUSPEND:
	/* Mayb