power_supply: Add TI BQ24257 charger driver
Based on the datasheet found here: http://www.ti.com/lit/ds/symlink/bq24257.pdf Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Laurentiu Palcu
Sebastian Reichel
parent
7f1a57fdd6
commit
2219a93596
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@ -0,0 +1,21 @@
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Binding for TI bq24257 Li-Ion Charger
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Required properties:
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- compatible: Should contain one of the following:
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* "ti,bq24257"
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- reg: integer, i2c address of the device.
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- ti,battery-regulation-voltage: integer, maximum charging voltage in uV.
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- ti,charge-current: integer, maximum charging current in uA.
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- ti,termination-current: integer, charge will be terminated when current in
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constant-voltage phase drops below this value (in uA).
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Example:
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bq24257 {
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compatible = "ti,bq24257";
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reg = <0x6a>;
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ti,battery-regulation-voltage = <4200000>;
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ti,charge-current = <1000000>;
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ti,termination-current = <50000>;
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};
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@ -388,6 +388,13 @@ config CHARGER_BQ24190
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help
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Say Y to enable support for the TI BQ24190 battery charger.
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config CHARGER_BQ24257
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tristate "TI BQ24257 battery charger driver"
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depends on I2C && GPIOLIB
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depends on REGMAP_I2C
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help
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Say Y to enable support for the TI BQ24257 battery charger.
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config CHARGER_BQ24735
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tristate "TI BQ24735 battery charger support"
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depends on I2C && GPIOLIB
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@ -58,6 +58,7 @@ obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
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obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
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obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o
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obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o
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obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o
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obj-$(CONFIG_CHARGER_BQ24735) += bq24735-charger.o
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obj-$(CONFIG_POWER_AVS) += avs/
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obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o
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@ -0,0 +1,863 @@
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/*
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* TI BQ24257 charger driver
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*
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* Copyright (C) 2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/types.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#define BQ24257_REG_1 0x00
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#define BQ24257_REG_2 0x01
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#define BQ24257_REG_3 0x02
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#define BQ24257_REG_4 0x03
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#define BQ24257_REG_5 0x04
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#define BQ24257_REG_6 0x05
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#define BQ24257_REG_7 0x06
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#define BQ24257_MANUFACTURER "Texas Instruments"
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#define BQ24257_STAT_IRQ "stat"
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#define BQ24257_PG_GPIO "pg"
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#define BQ24257_ILIM_SET_DELAY 1000 /* msec */
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enum bq24257_fields {
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F_WD_FAULT, F_WD_EN, F_STAT, F_FAULT, /* REG 1 */
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F_RESET, F_IILIMIT, F_EN_STAT, F_EN_TERM, F_CE, F_HZ_MODE, /* REG 2 */
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F_VBAT, F_USB_DET, /* REG 3 */
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F_ICHG, F_ITERM, /* REG 4 */
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F_LOOP_STATUS, F_LOW_CHG, F_DPDM_EN, F_CE_STATUS, F_VINDPM, /* REG 5 */
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F_X2_TMR_EN, F_TMR, F_SYSOFF, F_TS_STAT, /* REG 6 */
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F_VOVP, F_CLR_VDP, F_FORCE_BATDET, F_FORCE_PTM, /* REG 7 */
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F_MAX_FIELDS
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};
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/* initial field values, converted from uV/uA */
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struct bq24257_init_data {
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u8 ichg; /* charge current */
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u8 vbat; /* regulation voltage */
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u8 iterm; /* termination current */
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};
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struct bq24257_state {
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u8 status;
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u8 fault;
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bool power_good;
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};
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struct bq24257_device {
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struct i2c_client *client;
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struct device *dev;
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struct power_supply *charger;
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struct regmap *rmap;
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struct regmap_field *rmap_fields[F_MAX_FIELDS];
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struct gpio_desc *pg;
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struct delayed_work iilimit_setup_work;
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struct bq24257_init_data init_data;
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struct bq24257_state state;
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struct mutex lock; /* protect state data */
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};
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static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case BQ24257_REG_2:
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case BQ24257_REG_4:
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return false;
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default:
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return true;
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}
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}
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static const struct regmap_config bq24257_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = BQ24257_REG_7,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = bq24257_is_volatile_reg,
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};
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static const struct reg_field bq24257_reg_fields[] = {
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/* REG 1 */
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[F_WD_FAULT] = REG_FIELD(BQ24257_REG_1, 7, 7),
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[F_WD_EN] = REG_FIELD(BQ24257_REG_1, 6, 6),
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[F_STAT] = REG_FIELD(BQ24257_REG_1, 4, 5),
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[F_FAULT] = REG_FIELD(BQ24257_REG_1, 0, 3),
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/* REG 2 */
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[F_RESET] = REG_FIELD(BQ24257_REG_2, 7, 7),
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[F_IILIMIT] = REG_FIELD(BQ24257_REG_2, 4, 6),
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[F_EN_STAT] = REG_FIELD(BQ24257_REG_2, 3, 3),
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[F_EN_TERM] = REG_FIELD(BQ24257_REG_2, 2, 2),
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[F_CE] = REG_FIELD(BQ24257_REG_2, 1, 1),
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[F_HZ_MODE] = REG_FIELD(BQ24257_REG_2, 0, 0),
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/* REG 3 */
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[F_VBAT] = REG_FIELD(BQ24257_REG_3, 2, 7),
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[F_USB_DET] = REG_FIELD(BQ24257_REG_3, 0, 1),
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/* REG 4 */
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[F_ICHG] = REG_FIELD(BQ24257_REG_4, 3, 7),
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[F_ITERM] = REG_FIELD(BQ24257_REG_4, 0, 2),
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/* REG 5 */
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[F_LOOP_STATUS] = REG_FIELD(BQ24257_REG_5, 6, 7),
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[F_LOW_CHG] = REG_FIELD(BQ24257_REG_5, 5, 5),
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[F_DPDM_EN] = REG_FIELD(BQ24257_REG_5, 4, 4),
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[F_CE_STATUS] = REG_FIELD(BQ24257_REG_5, 3, 3),
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[F_VINDPM] = REG_FIELD(BQ24257_REG_5, 0, 2),
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/* REG 6 */
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[F_X2_TMR_EN] = REG_FIELD(BQ24257_REG_6, 7, 7),
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[F_TMR] = REG_FIELD(BQ24257_REG_6, 5, 6),
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[F_SYSOFF] = REG_FIELD(BQ24257_REG_6, 4, 4),
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[F_TS_STAT] = REG_FIELD(BQ24257_REG_6, 0, 2),
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/* REG 7 */
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[F_VOVP] = REG_FIELD(BQ24257_REG_7, 5, 7),
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[F_CLR_VDP] = REG_FIELD(BQ24257_REG_7, 4, 4),
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[F_FORCE_BATDET] = REG_FIELD(BQ24257_REG_7, 3, 3),
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[F_FORCE_PTM] = REG_FIELD(BQ24257_REG_7, 2, 2)
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};
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static const u32 bq24257_vbat_map[] = {
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3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000,
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3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000,
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3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000,
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3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000,
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4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000,
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4300000, 4320000, 4340000, 4360000, 4380000, 4400000, 4420000, 4440000
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};
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#define BQ24257_VBAT_MAP_SIZE ARRAY_SIZE(bq24257_vbat_map)
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static const u32 bq24257_ichg_map[] = {
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500000, 550000, 600000, 650000, 700000, 750000, 800000, 850000, 900000,
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950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000,
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1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
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1750000, 1800000, 1850000, 1900000, 1950000, 2000000
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};
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#define BQ24257_ICHG_MAP_SIZE ARRAY_SIZE(bq24257_ichg_map)
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static const u32 bq24257_iterm_map[] = {
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50000, 75000, 100000, 125000, 150000, 175000, 200000, 225000
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};
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#define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map)
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static int bq24257_field_read(struct bq24257_device *bq,
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enum bq24257_fields field_id)
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{
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int ret;
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int val;
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ret = regmap_field_read(bq->rmap_fields[field_id], &val);
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if (ret < 0)
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return ret;
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return val;
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}
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static int bq24257_field_write(struct bq24257_device *bq,
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enum bq24257_fields field_id, u8 val)
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{
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return regmap_field_write(bq->rmap_fields[field_id], val);
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}
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static u8 bq24257_find_idx(u32 value, const u32 *map, u8 map_size)
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{
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u8 idx;
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for (idx = 1; idx < map_size; idx++)
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if (value < map[idx])
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break;
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return idx - 1;
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}
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enum bq24257_status {
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STATUS_READY,
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STATUS_CHARGE_IN_PROGRESS,
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STATUS_CHARGE_DONE,
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STATUS_FAULT,
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};
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enum bq24257_fault {
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FAULT_NORMAL,
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FAULT_INPUT_OVP,
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FAULT_INPUT_UVLO,
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FAULT_SLEEP,
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FAULT_BAT_TS,
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FAULT_BAT_OVP,
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FAULT_TS,
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FAULT_TIMER,
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FAULT_NO_BAT,
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FAULT_ISET,
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FAULT_INPUT_LDO_LOW,
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};
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static int bq24257_power_supply_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct bq24257_device *bq = power_supply_get_drvdata(psy);
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struct bq24257_state state;
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mutex_lock(&bq->lock);
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state = bq->state;
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mutex_unlock(&bq->lock);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (!state.power_good)
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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else if (state.status == STATUS_READY)
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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else if (state.status == STATUS_CHARGE_IN_PROGRESS)
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else if (state.status == STATUS_CHARGE_DONE)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = BQ24257_MANUFACTURER;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = state.power_good;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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switch (state.fault) {
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case FAULT_NORMAL:
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case FAULT_INPUT_OVP:
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case FAULT_BAT_OVP:
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val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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break;
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case FAULT_TS:
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case FAULT_BAT_TS:
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
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break;
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case FAULT_TIMER:
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val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
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break;
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default:
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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break;
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}
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break;
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
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val->intval = bq24257_ichg_map[bq->init_data.ichg];
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break;
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
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val->intval = bq24257_ichg_map[BQ24257_ICHG_MAP_SIZE - 1];
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break;
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
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val->intval = bq24257_vbat_map[bq->init_data.vbat];
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break;
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
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val->intval = bq24257_vbat_map[BQ24257_VBAT_MAP_SIZE - 1];
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break;
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case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
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val->intval = bq24257_iterm_map[bq->init_data.iterm];
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int bq24257_get_chip_state(struct bq24257_device *bq,
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struct bq24257_state *state)
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{
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int ret;
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ret = bq24257_field_read(bq, F_STAT);
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if (ret < 0)
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return ret;
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state->status = ret;
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ret = bq24257_field_read(bq, F_FAULT);
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if (ret < 0)
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return ret;
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state->fault = ret;
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state->power_good = !gpiod_get_value_cansleep(bq->pg);
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return 0;
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}
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static bool bq24257_state_changed(struct bq24257_device *bq,
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struct bq24257_state *new_state)
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{
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int ret;
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mutex_lock(&bq->lock);
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ret = (bq->state.status != new_state->status ||
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bq->state.fault != new_state->fault ||
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bq->state.power_good != new_state->power_good);
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mutex_unlock(&bq->lock);
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return ret;
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}
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enum bq24257_loop_status {
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LOOP_STATUS_NONE,
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LOOP_STATUS_IN_DPM,
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LOOP_STATUS_IN_CURRENT_LIMIT,
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LOOP_STATUS_THERMAL,
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};
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enum bq24257_in_ilimit {
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IILIMIT_100,
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IILIMIT_150,
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IILIMIT_500,
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IILIMIT_900,
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IILIMIT_1500,
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IILIMIT_2000,
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IILIMIT_EXT,
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IILIMIT_NONE,
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};
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enum bq24257_port_type {
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PORT_TYPE_DCP, /* Dedicated Charging Port */
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PORT_TYPE_CDP, /* Charging Downstream Port */
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PORT_TYPE_SDP, /* Standard Downstream Port */
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PORT_TYPE_NON_STANDARD,
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};
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enum bq24257_safety_timer {
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SAFETY_TIMER_45,
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SAFETY_TIMER_360,
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SAFETY_TIMER_540,
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SAFETY_TIMER_NONE,
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};
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static int bq24257_iilimit_autoset(struct bq24257_device *bq)
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{
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int loop_status;
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int iilimit;
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int port_type;
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int ret;
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const u8 new_iilimit[] = {
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[PORT_TYPE_DCP] = IILIMIT_2000,
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[PORT_TYPE_CDP] = IILIMIT_2000,
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[PORT_TYPE_SDP] = IILIMIT_500,
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[PORT_TYPE_NON_STANDARD] = IILIMIT_500
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};
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|
||||
ret = bq24257_field_read(bq, F_LOOP_STATUS);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
loop_status = ret;
|
||||
|
||||
ret = bq24257_field_read(bq, F_IILIMIT);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
iilimit = ret;
|
||||
|
||||
/*
|
||||
* All USB ports should be able to handle 500mA. If not, DPM will lower
|
||||
* the charging current to accommodate the power source. No need to set
|
||||
* a lower IILIMIT value.
|
||||
*/
|
||||
if (loop_status == LOOP_STATUS_IN_DPM && iilimit == IILIMIT_500)
|
||||
return 0;
|
||||
|
||||
ret = bq24257_field_read(bq, F_USB_DET);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
port_type = ret;
|
||||
|
||||
ret = bq24257_field_write(bq, F_IILIMIT, new_iilimit[port_type]);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
ret = bq24257_field_write(bq, F_TMR, SAFETY_TIMER_360);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
ret = bq24257_field_write(bq, F_CLR_VDP, 1);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
dev_dbg(bq->dev, "port/loop = %d/%d -> iilimit = %d\n",
|
||||
port_type, loop_status, new_iilimit[port_type]);
|
||||
|
||||
return 0;
|
||||
|
||||
error:
|
||||
dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void bq24257_iilimit_setup_work(struct work_struct *work)
|
||||
{
|
||||
struct bq24257_device *bq = container_of(work, struct bq24257_device,
|
||||
iilimit_setup_work.work);
|
||||
|
||||
bq24257_iilimit_autoset(bq);
|
||||
}
|
||||
|
||||
static void bq24257_handle_state_change(struct bq24257_device *bq,
|
||||
struct bq24257_state *new_state)
|
||||
{
|
||||
int ret;
|
||||
struct bq24257_state old_state;
|
||||
bool reset_iilimit = false;
|
||||
bool config_iilimit = false;
|
||||
|
||||
mutex_lock(&bq->lock);
|
||||
old_state = bq->state;
|
||||
mutex_unlock(&bq->lock);
|
||||
|
||||
if (!new_state->power_good) { /* power removed */
|
||||
cancel_delayed_work_sync(&bq->iilimit_setup_work);
|
||||
|
||||
/* activate D+/D- port detection algorithm */
|
||||
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
reset_iilimit = true;
|
||||
} else if (!old_state.power_good) { /* power inserted */
|
||||
config_iilimit = true;
|
||||
} else if (new_state->fault == FAULT_NO_BAT) { /* battery removed */
|
||||
cancel_delayed_work_sync(&bq->iilimit_setup_work);
|
||||
|
||||
reset_iilimit = true;
|
||||
} else if (old_state.fault == FAULT_NO_BAT) { /* battery connected */
|
||||
config_iilimit = true;
|
||||
} else if (new_state->fault == FAULT_TIMER) { /* safety timer expired */
|
||||
dev_err(bq->dev, "Safety timer expired! Battery dead?\n");
|
||||
}
|
||||
|
||||
if (reset_iilimit) {
|
||||
ret = bq24257_field_write(bq, F_IILIMIT, IILIMIT_500);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
} else if (config_iilimit) {
|
||||
schedule_delayed_work(&bq->iilimit_setup_work,
|
||||
msecs_to_jiffies(BQ24257_ILIM_SET_DELAY));
|
||||
}
|
||||
|
||||
return;
|
||||
|
||||
error:
|
||||
dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__);
|
||||
}
|
||||
|
||||
static irqreturn_t bq24257_irq_handler_thread(int irq, void *private)
|
||||
{
|
||||
int ret;
|
||||
struct bq24257_device *bq = private;
|
||||
struct bq24257_state state;
|
||||
|
||||
ret = bq24257_get_chip_state(bq, &state);
|
||||
if (ret < 0)
|
||||
return IRQ_HANDLED;
|
||||
|
||||
if (!bq24257_state_changed(bq, &state))
|
||||
return IRQ_HANDLED;
|
||||
|
||||
dev_dbg(bq->dev, "irq(state changed): status/fault/pg = %d/%d/%d\n",
|
||||
state.status, state.fault, state.power_good);
|
||||
|
||||
bq24257_handle_state_change(bq, &state);
|
||||
|
||||
mutex_lock(&bq->lock);
|
||||
bq->state = state;
|
||||
mutex_unlock(&bq->lock);
|
||||
|
||||
power_supply_changed(bq->charger);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int bq24257_hw_init(struct bq24257_device *bq)
|
||||
{
|
||||
int ret;
|
||||
int i;
|
||||
struct bq24257_state state;
|
||||
|
||||
const struct {
|
||||
int field;
|
||||
u32 value;
|
||||
} init_data[] = {
|
||||
{F_ICHG, bq->init_data.ichg},
|
||||
{F_VBAT, bq->init_data.vbat},
|
||||
{F_ITERM, bq->init_data.iterm}
|
||||
};
|
||||
|
||||
/*
|
||||
* Disable the watchdog timer to prevent the IC from going back to
|
||||
* default settings after 50 seconds of I2C inactivity.
|
||||
*/
|
||||
ret = bq24257_field_write(bq, F_WD_EN, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* configure the charge currents and voltages */
|
||||
for (i = 0; i < ARRAY_SIZE(init_data); i++) {
|
||||
ret = bq24257_field_write(bq, init_data[i].field,
|
||||
init_data[i].value);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = bq24257_get_chip_state(bq, &state);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
mutex_lock(&bq->lock);
|
||||
bq->state = state;
|
||||
mutex_unlock(&bq->lock);
|
||||
|
||||
if (!state.power_good)
|
||||
/* activate D+/D- detection algorithm */
|
||||
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
|
||||
else if (state.fault != FAULT_NO_BAT)
|
||||
ret = bq24257_iilimit_autoset(bq);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static enum power_supply_property bq24257_power_supply_props[] = {
|
||||
POWER_SUPPLY_PROP_MANUFACTURER,
|
||||
POWER_SUPPLY_PROP_STATUS,
|
||||
POWER_SUPPLY_PROP_ONLINE,
|
||||
POWER_SUPPLY_PROP_HEALTH,
|
||||
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
|
||||
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
|
||||
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
||||
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
|
||||
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
|
||||
};
|
||||
|
||||
static char *bq24257_charger_supplied_to[] = {
|
||||
"main-battery",
|
||||
};
|
||||
|
||||
static const struct power_supply_desc bq24257_power_supply_desc = {
|
||||
.name = "bq24257-charger",
|
||||
.type = POWER_SUPPLY_TYPE_USB,
|
||||
.properties = bq24257_power_supply_props,
|
||||
.num_properties = ARRAY_SIZE(bq24257_power_supply_props),
|
||||
.get_property = bq24257_power_supply_get_property,
|
||||
};
|
||||
|
||||
static int bq24257_power_supply_init(struct bq24257_device *bq)
|
||||
{
|
||||
struct power_supply_config psy_cfg = { .drv_data = bq, };
|
||||
|
||||
psy_cfg.supplied_to = bq24257_charger_supplied_to;
|
||||
psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to);
|
||||
|
||||
bq->charger = power_supply_register(bq->dev, &bq24257_power_supply_desc,
|
||||
&psy_cfg);
|
||||
if (IS_ERR(bq->charger))
|
||||
return PTR_ERR(bq->charger);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bq24257_irq_probe(struct bq24257_device *bq)
|
||||
{
|
||||
int ret;
|
||||
struct gpio_desc *stat_irq;
|
||||
|
||||
stat_irq = devm_gpiod_get_index(bq->dev, BQ24257_STAT_IRQ, 0);
|
||||
if (IS_ERR(stat_irq)) {
|
||||
dev_err(bq->dev, "could not probe stat_irq pin\n");
|
||||
return PTR_ERR(stat_irq);
|
||||
}
|
||||
|
||||
ret = gpiod_direction_input(stat_irq);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return gpiod_to_irq(stat_irq);
|
||||
}
|
||||
|
||||
static int bq24257_pg_gpio_probe(struct bq24257_device *bq)
|
||||
{
|
||||
bq->pg = devm_gpiod_get_index(bq->dev, BQ24257_PG_GPIO, 0);
|
||||
if (IS_ERR(bq->pg)) {
|
||||
dev_err(bq->dev, "could not probe PG pin\n");
|
||||
return PTR_ERR(bq->pg);
|
||||
}
|
||||
|
||||
return gpiod_direction_input(bq->pg);
|
||||
}
|
||||
|
||||
static int bq24257_fw_probe(struct bq24257_device *bq)
|
||||
{
|
||||
int ret;
|
||||
u32 property;
|
||||
|
||||
ret = device_property_read_u32(bq->dev, "ti,charge-current", &property);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
bq->init_data.ichg = bq24257_find_idx(property, bq24257_ichg_map,
|
||||
BQ24257_ICHG_MAP_SIZE);
|
||||
|
||||
ret = device_property_read_u32(bq->dev, "ti,battery-regulation-voltage",
|
||||
&property);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
bq->init_data.vbat = bq24257_find_idx(property, bq24257_vbat_map,
|
||||
BQ24257_VBAT_MAP_SIZE);
|
||||
|
||||
ret = device_property_read_u32(bq->dev, "ti,termination-current",
|
||||
&property);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map,
|
||||
BQ24257_ITERM_MAP_SIZE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bq24257_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
|
||||
struct device *dev = &client->dev;
|
||||
struct bq24257_device *bq;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||||
dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
|
||||
if (!bq)
|
||||
return -ENOMEM;
|
||||
|
||||
bq->client = client;
|
||||
bq->dev = dev;
|
||||
|
||||
mutex_init(&bq->lock);
|
||||
|
||||
bq->rmap = devm_regmap_init_i2c(client, &bq24257_regmap_config);
|
||||
if (IS_ERR(bq->rmap)) {
|
||||
dev_err(dev, "failed to allocate register map\n");
|
||||
return PTR_ERR(bq->rmap);
|
||||
}
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(bq24257_reg_fields); i++) {
|
||||
const struct reg_field *reg_fields = bq24257_reg_fields;
|
||||
|
||||
bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
|
||||
reg_fields[i]);
|
||||
if (IS_ERR(bq->rmap_fields[i])) {
|
||||
dev_err(dev, "cannot allocate regmap field\n");
|
||||
return PTR_ERR(bq->rmap_fields[i]);
|
||||
}
|
||||
}
|
||||
|
||||
i2c_set_clientdata(client, bq);
|
||||
|
||||
INIT_DELAYED_WORK(&bq->iilimit_setup_work, bq24257_iilimit_setup_work);
|
||||
|
||||
if (!dev->platform_data) {
|
||||
ret = bq24257_fw_probe(bq);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Cannot read device properties.\n");
|
||||
return ret;
|
||||
}
|
||||
} else {
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* we can only check Power Good status by probing the PG pin */
|
||||
ret = bq24257_pg_gpio_probe(bq);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* reset all registers to defaults */
|
||||
ret = bq24257_field_write(bq, F_RESET, 1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* Put the RESET bit back to 0, in cache. For some reason the HW always
|
||||
* returns 1 on this bit, so this is the only way to avoid resetting the
|
||||
* chip every time we update another field in this register.
|
||||
*/
|
||||
ret = bq24257_field_write(bq, F_RESET, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = bq24257_hw_init(bq);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Cannot initialize the chip.\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (client->irq <= 0)
|
||||
client->irq = bq24257_irq_probe(bq);
|
||||
|
||||
if (client->irq < 0) {
|
||||
dev_err(dev, "no irq resource found\n");
|
||||
return client->irq;
|
||||
}
|
||||
|
||||
ret = devm_request_threaded_irq(dev, client->irq, NULL,
|
||||
bq24257_irq_handler_thread,
|
||||
IRQF_TRIGGER_FALLING |
|
||||
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
||||
BQ24257_STAT_IRQ, bq);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = bq24257_power_supply_init(bq);
|
||||
if (ret < 0)
|
||||
dev_err(dev, "Failed to register power supply\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bq24257_remove(struct i2c_client *client)
|
||||
{
|
||||
struct bq24257_device *bq = i2c_get_clientdata(client);
|
||||
|
||||
cancel_delayed_work_sync(&bq->iilimit_setup_work);
|
||||
|
||||
power_supply_unregister(bq->charger);
|
||||
|
||||
bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int bq24257_suspend(struct device *dev)
|
||||
{
|
||||
struct bq24257_device *bq = dev_get_drvdata(dev);
|
||||
int ret = 0;
|
||||
|
||||
cancel_delayed_work_sync(&bq->iilimit_setup_work);
|
||||
|
||||
/* reset all registers to default (and activate standalone mode) */
|
||||
ret = bq24257_field_write(bq, F_RESET, 1);
|
||||
if (ret < 0)
|
||||
dev_err(bq->dev, "Cannot reset chip to standalone mode.\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bq24257_resume(struct device *dev)
|
||||
{
|
||||
int ret;
|
||||
struct bq24257_device *bq = dev_get_drvdata(dev);
|
||||
|
||||
ret = regcache_drop_region(bq->rmap, BQ24257_REG_1, BQ24257_REG_7);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = bq24257_field_write(bq, F_RESET, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = bq24257_hw_init(bq);
|
||||
if (ret < 0) {
|
||||
dev_err(bq->dev, "Cannot init chip after resume.\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* signal userspace, maybe state changed while suspended */
|
||||
power_supply_changed(bq->charger);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops bq24257_pm = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(bq24257_suspend, bq24257_resume)
|
||||
};
|
||||
|
||||
static const struct i2c_device_id bq24257_i2c_ids[] = {
|
||||
{ "bq24257", 0 },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids);
|
||||
|
||||
static const struct of_device_id bq24257_of_match[] = {
|
||||
{ .compatible = "ti,bq24257", },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, bq24257_of_match);
|
||||
|
||||
static const struct acpi_device_id bq24257_acpi_match[] = {
|
||||
{"BQ242570", 0},
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match);
|
||||
|
||||
static struct i2c_driver bq24257_driver = {
|
||||
.driver = {
|
||||
.name = "bq24257-charger",
|
||||
.of_match_table = of_match_ptr(bq24257_of_match),
|
||||
.acpi_match_table = ACPI_PTR(bq24257_acpi_match),
|
||||
.pm = &bq24257_pm,
|
||||
},
|
||||
.probe = bq24257_probe,
|
||||
.remove = bq24257_remove,
|
||||
.id_table = bq24257_i2c_ids,
|
||||
};
|
||||
module_i2c_driver(bq24257_driver);
|
||||
|
||||
MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
|
||||
MODULE_DESCRIPTION("bq24257 charger driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
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Reference in New Issue