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aecd127b45
This invalidates empty->counter_uah and charge_full when charge_now indicates that they are grossly wrong and adds some tolerance to POWER_SUPPLY_PROP_CHARGE_FULL to allow for inaccuracies in the charge counter and manufacturing tolerances in the battery. Signed-off-by: Carl Philipp Klemm <philipp@uvos.xyz> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
1130 lines
30 KiB
C
1130 lines
30 KiB
C
/*
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* Battery driver for CPCAP PMIC
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*
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* Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
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*
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* Some parts of the code based on earlier Motorola mapphone Linux kernel
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* drivers:
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*
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* Copyright (C) 2009-2010 Motorola, Inc.
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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 version 2 as
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* published by the Free Software Foundation.
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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#include <linux/moduleparam.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/types.h>
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#include <linux/mfd/motorola-cpcap.h>
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/*
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* Register bit defines for CPCAP_REG_BPEOL. Some of these seem to
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* map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0"
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* to enable BATTDETEN, LOBAT and EOL features. We currently use
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* LOBAT interrupts instead of EOL.
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*/
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#define CPCAP_REG_BPEOL_BIT_EOL9 BIT(9) /* Set for EOL irq */
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#define CPCAP_REG_BPEOL_BIT_EOL8 BIT(8) /* Set for EOL irq */
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#define CPCAP_REG_BPEOL_BIT_UNKNOWN7 BIT(7)
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#define CPCAP_REG_BPEOL_BIT_UNKNOWN6 BIT(6)
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#define CPCAP_REG_BPEOL_BIT_UNKNOWN5 BIT(5)
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#define CPCAP_REG_BPEOL_BIT_EOL_MULTI BIT(4) /* Set for multiple EOL irqs */
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#define CPCAP_REG_BPEOL_BIT_UNKNOWN3 BIT(3)
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#define CPCAP_REG_BPEOL_BIT_UNKNOWN2 BIT(2)
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#define CPCAP_REG_BPEOL_BIT_BATTDETEN BIT(1) /* Enable battery detect */
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#define CPCAP_REG_BPEOL_BIT_EOLSEL BIT(0) /* BPDET = 0, EOL = 1 */
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/*
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* Register bit defines for CPCAP_REG_CCC1. These seem similar to the twl6030
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* coulomb counter registers rather than the mc13892 registers. Both twl6030
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* and mc13892 set bits 2 and 1 to reset and clear registers. But mc13892
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* sets bit 0 to start the coulomb counter while twl6030 sets bit 0 to stop
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* the coulomb counter like cpcap does. So for now, we use the twl6030 style
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* naming for the registers.
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*/
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#define CPCAP_REG_CCC1_ACTIVE_MODE1 BIT(4) /* Update rate */
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#define CPCAP_REG_CCC1_ACTIVE_MODE0 BIT(3) /* Update rate */
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#define CPCAP_REG_CCC1_AUTOCLEAR BIT(2) /* Resets sample registers */
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#define CPCAP_REG_CCC1_CAL_EN BIT(1) /* Clears after write in 1s */
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#define CPCAP_REG_CCC1_PAUSE BIT(0) /* Stop counters, allow write */
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#define CPCAP_REG_CCC1_RESET_MASK (CPCAP_REG_CCC1_AUTOCLEAR | \
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CPCAP_REG_CCC1_CAL_EN)
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#define CPCAP_REG_CCCC2_RATE1 BIT(5)
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#define CPCAP_REG_CCCC2_RATE0 BIT(4)
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#define CPCAP_REG_CCCC2_ENABLE BIT(3)
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#define CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS 250
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enum {
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CPCAP_BATTERY_IIO_BATTDET,
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CPCAP_BATTERY_IIO_VOLTAGE,
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CPCAP_BATTERY_IIO_CHRG_CURRENT,
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CPCAP_BATTERY_IIO_BATT_CURRENT,
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CPCAP_BATTERY_IIO_NR,
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};
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enum cpcap_battery_irq_action {
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CPCAP_BATTERY_IRQ_ACTION_NONE,
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CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE,
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CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW,
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CPCAP_BATTERY_IRQ_ACTION_POWEROFF,
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};
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struct cpcap_interrupt_desc {
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const char *name;
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struct list_head node;
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int irq;
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enum cpcap_battery_irq_action action;
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};
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struct cpcap_battery_config {
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int cd_factor;
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struct power_supply_info info;
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struct power_supply_battery_info bat;
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};
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struct cpcap_coulomb_counter_data {
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s32 sample; /* 24 or 32 bits */
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s32 accumulator;
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s16 offset; /* 9 bits */
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s16 integrator; /* 13 or 16 bits */
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};
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enum cpcap_battery_state {
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CPCAP_BATTERY_STATE_PREVIOUS,
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CPCAP_BATTERY_STATE_LATEST,
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CPCAP_BATTERY_STATE_EMPTY,
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CPCAP_BATTERY_STATE_FULL,
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CPCAP_BATTERY_STATE_NR,
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};
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struct cpcap_battery_state_data {
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int voltage;
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int current_ua;
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int counter_uah;
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int temperature;
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ktime_t time;
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struct cpcap_coulomb_counter_data cc;
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};
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struct cpcap_battery_ddata {
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struct device *dev;
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struct regmap *reg;
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struct list_head irq_list;
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struct iio_channel *channels[CPCAP_BATTERY_IIO_NR];
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struct power_supply *psy;
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struct cpcap_battery_config config;
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struct cpcap_battery_state_data state[CPCAP_BATTERY_STATE_NR];
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u32 cc_lsb; /* μAms per LSB */
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atomic_t active;
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int charge_full;
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int status;
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u16 vendor;
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unsigned int is_full:1;
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};
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#define CPCAP_NO_BATTERY -400
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static bool ignore_temperature_probe;
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module_param(ignore_temperature_probe, bool, 0660);
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static struct cpcap_battery_state_data *
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cpcap_battery_get_state(struct cpcap_battery_ddata *ddata,
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enum cpcap_battery_state state)
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{
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if (state >= CPCAP_BATTERY_STATE_NR)
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return NULL;
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return &ddata->state[state];
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}
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static struct cpcap_battery_state_data *
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cpcap_battery_latest(struct cpcap_battery_ddata *ddata)
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{
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return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_LATEST);
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}
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static struct cpcap_battery_state_data *
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cpcap_battery_previous(struct cpcap_battery_ddata *ddata)
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{
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return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_PREVIOUS);
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}
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static struct cpcap_battery_state_data *
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cpcap_battery_get_empty(struct cpcap_battery_ddata *ddata)
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{
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return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_EMPTY);
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}
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static struct cpcap_battery_state_data *
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cpcap_battery_get_full(struct cpcap_battery_ddata *ddata)
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{
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return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_FULL);
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}
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static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata,
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int *value)
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{
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struct iio_channel *channel;
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int error;
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channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET];
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error = iio_read_channel_processed(channel, value);
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if (error < 0) {
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if (!ignore_temperature_probe)
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dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
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*value = CPCAP_NO_BATTERY;
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return error;
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}
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*value /= 100;
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return 0;
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}
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static int cpcap_battery_get_voltage(struct cpcap_battery_ddata *ddata)
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{
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struct iio_channel *channel;
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int error, value = 0;
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channel = ddata->channels[CPCAP_BATTERY_IIO_VOLTAGE];
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error = iio_read_channel_processed(channel, &value);
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if (error < 0) {
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dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
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return 0;
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}
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return value * 1000;
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}
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static int cpcap_battery_get_current(struct cpcap_battery_ddata *ddata)
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{
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struct iio_channel *channel;
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int error, value = 0;
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channel = ddata->channels[CPCAP_BATTERY_IIO_BATT_CURRENT];
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error = iio_read_channel_processed(channel, &value);
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if (error < 0) {
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dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
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return 0;
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}
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return value * 1000;
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}
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/**
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* cpcap_battery_cc_raw_div - calculate and divide coulomb counter μAms values
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* @ddata: device driver data
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* @sample: coulomb counter sample value
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* @accumulator: coulomb counter integrator value
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* @offset: coulomb counter offset value
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* @divider: conversion divider
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*
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* Note that cc_lsb and cc_dur values are from Motorola Linux kernel
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* function data_get_avg_curr_ua() and seem to be based on measured test
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* results. It also has the following comment:
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*
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* Adjustment factors are applied here as a temp solution per the test
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* results. Need to work out a formal solution for this adjustment.
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*
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* A coulomb counter for similar hardware seems to be documented in
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* "TWL6030 Gas Gauging Basics (Rev. A)" swca095a.pdf in chapter
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* "10 Calculating Accumulated Current". We however follow what the
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* Motorola mapphone Linux kernel is doing as there may be either a
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* TI or ST coulomb counter in the PMIC.
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*/
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static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
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s32 sample, s32 accumulator,
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s16 offset, u32 divider)
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{
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s64 acc;
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if (!divider)
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return 0;
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acc = accumulator;
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acc -= (s64)sample * offset;
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acc *= ddata->cc_lsb;
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acc *= -1;
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acc = div_s64(acc, divider);
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return acc;
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}
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/* 3600000μAms = 1μAh */
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static int cpcap_battery_cc_to_uah(struct cpcap_battery_ddata *ddata,
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s32 sample, s32 accumulator,
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s16 offset)
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{
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return cpcap_battery_cc_raw_div(ddata, sample,
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accumulator, offset,
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3600000);
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}
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static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata,
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s32 sample, s32 accumulator,
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s16 offset)
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{
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return cpcap_battery_cc_raw_div(ddata, sample,
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accumulator, offset,
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sample *
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CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS);
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}
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/**
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* cpcap_battery_read_accumulated - reads cpcap coulomb counter
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* @ddata: device driver data
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* @ccd: coulomb counter values
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*
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* Based on Motorola mapphone kernel function data_read_regs().
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* Looking at the registers, the coulomb counter seems similar to
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* the coulomb counter in TWL6030. See "TWL6030 Gas Gauging Basics
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* (Rev. A) swca095a.pdf for "10 Calculating Accumulated Current".
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*
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* Note that swca095a.pdf instructs to stop the coulomb counter
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* before reading to avoid values changing. Motorola mapphone
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* Linux kernel does not do it, so let's assume they've verified
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* the data produced is correct.
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*/
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static int
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cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata,
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struct cpcap_coulomb_counter_data *ccd)
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{
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u16 buf[7]; /* CPCAP_REG_CCS1 to CCI */
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int error;
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ccd->sample = 0;
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ccd->accumulator = 0;
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ccd->offset = 0;
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ccd->integrator = 0;
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/* Read coulomb counter register range */
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error = regmap_bulk_read(ddata->reg, CPCAP_REG_CCS1,
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buf, ARRAY_SIZE(buf));
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if (error)
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return 0;
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/* Sample value CPCAP_REG_CCS1 & 2 */
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ccd->sample = (buf[1] & 0x0fff) << 16;
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ccd->sample |= buf[0];
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if (ddata->vendor == CPCAP_VENDOR_TI)
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ccd->sample = sign_extend32(24, ccd->sample);
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/* Accumulator value CPCAP_REG_CCA1 & 2 */
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ccd->accumulator = ((s16)buf[3]) << 16;
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ccd->accumulator |= buf[2];
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/*
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* Coulomb counter calibration offset is CPCAP_REG_CCM,
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* REG_CCO seems unused
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*/
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ccd->offset = buf[4];
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ccd->offset = sign_extend32(ccd->offset, 9);
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/* Integrator register CPCAP_REG_CCI */
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if (ddata->vendor == CPCAP_VENDOR_TI)
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ccd->integrator = sign_extend32(buf[6], 13);
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else
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ccd->integrator = (s16)buf[6];
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return cpcap_battery_cc_to_uah(ddata,
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ccd->sample,
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ccd->accumulator,
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ccd->offset);
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}
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/**
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* cpcap_battery_cc_get_avg_current - read cpcap coulumb counter
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* @ddata: cpcap battery driver device data
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*/
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static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata)
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{
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int value, acc, error;
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s32 sample;
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s16 offset;
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/* Coulomb counter integrator */
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error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value);
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if (error)
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return error;
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if (ddata->vendor == CPCAP_VENDOR_TI) {
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acc = sign_extend32(value, 13);
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sample = 1;
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} else {
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acc = (s16)value;
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sample = 4;
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}
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/* Coulomb counter calibration offset */
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error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
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if (error)
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return error;
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offset = sign_extend32(value, 9);
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return cpcap_battery_cc_to_ua(ddata, sample, acc, offset);
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}
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static int cpcap_battery_get_charger_status(struct cpcap_battery_ddata *ddata,
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int *val)
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{
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union power_supply_propval prop;
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struct power_supply *charger;
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int error;
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charger = power_supply_get_by_name("usb");
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if (!charger)
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return -ENODEV;
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error = power_supply_get_property(charger, POWER_SUPPLY_PROP_STATUS,
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&prop);
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if (error)
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*val = POWER_SUPPLY_STATUS_UNKNOWN;
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else
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*val = prop.intval;
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power_supply_put(charger);
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return error;
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}
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static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata)
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{
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struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
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unsigned int vfull;
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int error, val;
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error = cpcap_battery_get_charger_status(ddata, &val);
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if (!error) {
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switch (val) {
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case POWER_SUPPLY_STATUS_DISCHARGING:
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dev_dbg(ddata->dev, "charger disconnected\n");
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ddata->is_full = 0;
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break;
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case POWER_SUPPLY_STATUS_FULL:
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dev_dbg(ddata->dev, "charger full status\n");
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ddata->is_full = 1;
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break;
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default:
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break;
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}
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}
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/*
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* The full battery voltage here can be inaccurate, it's used just to
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* filter out any trickle charging events. We clear the is_full status
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* on charger disconnect above anyways.
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*/
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vfull = ddata->config.bat.constant_charge_voltage_max_uv - 120000;
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if (ddata->is_full && state->voltage < vfull)
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ddata->is_full = 0;
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return ddata->is_full;
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}
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static bool cpcap_battery_low(struct cpcap_battery_ddata *ddata)
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{
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struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
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static bool is_low;
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if (state->current_ua > 0 && (state->voltage <= 3350000 || is_low))
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is_low = true;
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else
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is_low = false;
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return is_low;
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}
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static int cpcap_battery_update_status(struct cpcap_battery_ddata *ddata)
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{
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struct cpcap_battery_state_data state, *latest, *previous,
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*empty, *full;
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ktime_t now;
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int error;
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memset(&state, 0, sizeof(state));
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now = ktime_get();
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latest = cpcap_battery_latest(ddata);
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if (latest) {
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s64 delta_ms = ktime_to_ms(ktime_sub(now, latest->time));
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if (delta_ms < CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS)
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return delta_ms;
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}
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state.time = now;
|
|
state.voltage = cpcap_battery_get_voltage(ddata);
|
|
state.current_ua = cpcap_battery_get_current(ddata);
|
|
state.counter_uah = cpcap_battery_read_accumulated(ddata, &state.cc);
|
|
|
|
error = cpcap_charger_battery_temperature(ddata,
|
|
&state.temperature);
|
|
if (error)
|
|
return error;
|
|
|
|
previous = cpcap_battery_previous(ddata);
|
|
memcpy(previous, latest, sizeof(*previous));
|
|
memcpy(latest, &state, sizeof(*latest));
|
|
|
|
if (cpcap_battery_full(ddata)) {
|
|
full = cpcap_battery_get_full(ddata);
|
|
memcpy(full, latest, sizeof(*full));
|
|
|
|
empty = cpcap_battery_get_empty(ddata);
|
|
if (empty->voltage && empty->voltage != -1) {
|
|
empty->voltage = -1;
|
|
ddata->charge_full =
|
|
empty->counter_uah - full->counter_uah;
|
|
} else if (ddata->charge_full) {
|
|
empty->voltage = -1;
|
|
empty->counter_uah =
|
|
full->counter_uah + ddata->charge_full;
|
|
}
|
|
} else if (cpcap_battery_low(ddata)) {
|
|
empty = cpcap_battery_get_empty(ddata);
|
|
memcpy(empty, latest, sizeof(*empty));
|
|
|
|
full = cpcap_battery_get_full(ddata);
|
|
if (full->voltage) {
|
|
full->voltage = 0;
|
|
ddata->charge_full =
|
|
empty->counter_uah - full->counter_uah;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update battery status when cpcap-charger calls power_supply_changed().
|
|
* This allows us to detect battery full condition before the charger
|
|
* disconnects.
|
|
*/
|
|
static void cpcap_battery_external_power_changed(struct power_supply *psy)
|
|
{
|
|
union power_supply_propval prop;
|
|
|
|
power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &prop);
|
|
}
|
|
|
|
static enum power_supply_property cpcap_battery_props[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_PRESENT,
|
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
|
POWER_SUPPLY_PROP_VOLTAGE_NOW,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
POWER_SUPPLY_PROP_CURRENT_AVG,
|
|
POWER_SUPPLY_PROP_CURRENT_NOW,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL,
|
|
POWER_SUPPLY_PROP_CHARGE_NOW,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
|
|
POWER_SUPPLY_PROP_CHARGE_COUNTER,
|
|
POWER_SUPPLY_PROP_POWER_NOW,
|
|
POWER_SUPPLY_PROP_POWER_AVG,
|
|
POWER_SUPPLY_PROP_CAPACITY,
|
|
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
|
|
POWER_SUPPLY_PROP_SCOPE,
|
|
POWER_SUPPLY_PROP_TEMP,
|
|
};
|
|
|
|
static int cpcap_battery_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
|
|
struct cpcap_battery_state_data *latest, *previous, *empty;
|
|
u32 sample;
|
|
s32 accumulator;
|
|
int cached;
|
|
s64 tmp;
|
|
|
|
cached = cpcap_battery_update_status(ddata);
|
|
if (cached < 0)
|
|
return cached;
|
|
|
|
latest = cpcap_battery_latest(ddata);
|
|
previous = cpcap_battery_previous(ddata);
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
if (latest->temperature > CPCAP_NO_BATTERY || ignore_temperature_probe)
|
|
val->intval = 1;
|
|
else
|
|
val->intval = 0;
|
|
break;
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
if (cpcap_battery_full(ddata)) {
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
break;
|
|
}
|
|
if (cpcap_battery_cc_get_avg_current(ddata) < 0)
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
else
|
|
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = ddata->config.info.technology;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
val->intval = cpcap_battery_get_voltage(ddata);
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
val->intval = ddata->config.info.voltage_max_design;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
|
|
val->intval = ddata->config.info.voltage_min_design;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
val->intval = ddata->config.bat.constant_charge_voltage_max_uv;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CURRENT_AVG:
|
|
sample = latest->cc.sample - previous->cc.sample;
|
|
if (!sample) {
|
|
val->intval = cpcap_battery_cc_get_avg_current(ddata);
|
|
break;
|
|
}
|
|
accumulator = latest->cc.accumulator - previous->cc.accumulator;
|
|
val->intval = cpcap_battery_cc_to_ua(ddata, sample,
|
|
accumulator,
|
|
latest->cc.offset);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
val->intval = latest->current_ua;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
|
|
val->intval = latest->counter_uah;
|
|
break;
|
|
case POWER_SUPPLY_PROP_POWER_NOW:
|
|
tmp = (latest->voltage / 10000) * latest->current_ua;
|
|
val->intval = div64_s64(tmp, 100);
|
|
break;
|
|
case POWER_SUPPLY_PROP_POWER_AVG:
|
|
sample = latest->cc.sample - previous->cc.sample;
|
|
if (!sample) {
|
|
tmp = cpcap_battery_cc_get_avg_current(ddata);
|
|
tmp *= (latest->voltage / 10000);
|
|
val->intval = div64_s64(tmp, 100);
|
|
break;
|
|
}
|
|
accumulator = latest->cc.accumulator - previous->cc.accumulator;
|
|
tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator,
|
|
latest->cc.offset);
|
|
tmp *= ((latest->voltage + previous->voltage) / 20000);
|
|
val->intval = div64_s64(tmp, 100);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
empty = cpcap_battery_get_empty(ddata);
|
|
if (!empty->voltage || !ddata->charge_full)
|
|
return -ENODATA;
|
|
/* (ddata->charge_full / 200) is needed for rounding */
|
|
val->intval = empty->counter_uah - latest->counter_uah +
|
|
ddata->charge_full / 200;
|
|
val->intval = clamp(val->intval, 0, ddata->charge_full);
|
|
val->intval = val->intval * 100 / ddata->charge_full;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
|
|
if (cpcap_battery_full(ddata))
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
|
|
else if (latest->voltage >= 3750000)
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
|
|
else if (latest->voltage >= 3300000)
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
|
|
else if (latest->voltage > 3100000)
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
|
|
else if (latest->voltage <= 3100000)
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
|
|
else
|
|
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
empty = cpcap_battery_get_empty(ddata);
|
|
if (!empty->voltage)
|
|
return -ENODATA;
|
|
val->intval = empty->counter_uah - latest->counter_uah;
|
|
if (val->intval < 0) {
|
|
/* Assume invalid config if CHARGE_NOW is -20% */
|
|
if (ddata->charge_full && abs(val->intval) > ddata->charge_full/5) {
|
|
empty->voltage = 0;
|
|
ddata->charge_full = 0;
|
|
return -ENODATA;
|
|
}
|
|
val->intval = 0;
|
|
} else if (ddata->charge_full && ddata->charge_full < val->intval) {
|
|
/* Assume invalid config if CHARGE_NOW exceeds CHARGE_FULL by 20% */
|
|
if (val->intval > (6*ddata->charge_full)/5) {
|
|
empty->voltage = 0;
|
|
ddata->charge_full = 0;
|
|
return -ENODATA;
|
|
}
|
|
val->intval = ddata->charge_full;
|
|
}
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
if (!ddata->charge_full)
|
|
return -ENODATA;
|
|
val->intval = ddata->charge_full;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
val->intval = ddata->config.info.charge_full_design;
|
|
break;
|
|
case POWER_SUPPLY_PROP_SCOPE:
|
|
val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
if (ignore_temperature_probe)
|
|
return -ENODATA;
|
|
val->intval = latest->temperature;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_battery_update_charger(struct cpcap_battery_ddata *ddata,
|
|
int const_charge_voltage)
|
|
{
|
|
union power_supply_propval prop;
|
|
union power_supply_propval val;
|
|
struct power_supply *charger;
|
|
int error;
|
|
|
|
charger = power_supply_get_by_name("usb");
|
|
if (!charger)
|
|
return -ENODEV;
|
|
|
|
error = power_supply_get_property(charger,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
&prop);
|
|
if (error)
|
|
goto out_put;
|
|
|
|
/* Allow charger const voltage lower than battery const voltage */
|
|
if (const_charge_voltage > prop.intval)
|
|
goto out_put;
|
|
|
|
val.intval = const_charge_voltage;
|
|
|
|
error = power_supply_set_property(charger,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
&val);
|
|
out_put:
|
|
power_supply_put(charger);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int cpcap_battery_set_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
const union power_supply_propval *val)
|
|
{
|
|
struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
if (val->intval < ddata->config.info.voltage_min_design)
|
|
return -EINVAL;
|
|
if (val->intval > ddata->config.info.voltage_max_design)
|
|
return -EINVAL;
|
|
|
|
ddata->config.bat.constant_charge_voltage_max_uv = val->intval;
|
|
|
|
return cpcap_battery_update_charger(ddata, val->intval);
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
if (val->intval < 0)
|
|
return -EINVAL;
|
|
if (val->intval > (6*ddata->config.info.charge_full_design)/5)
|
|
return -EINVAL;
|
|
|
|
ddata->charge_full = val->intval;
|
|
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_battery_property_is_writeable(struct power_supply *psy,
|
|
enum power_supply_property psp)
|
|
{
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
|
|
{
|
|
struct cpcap_battery_ddata *ddata = data;
|
|
struct cpcap_battery_state_data *latest;
|
|
struct cpcap_interrupt_desc *d;
|
|
|
|
if (!atomic_read(&ddata->active))
|
|
return IRQ_NONE;
|
|
|
|
list_for_each_entry(d, &ddata->irq_list, node) {
|
|
if (irq == d->irq)
|
|
break;
|
|
}
|
|
|
|
if (list_entry_is_head(d, &ddata->irq_list, node))
|
|
return IRQ_NONE;
|
|
|
|
latest = cpcap_battery_latest(ddata);
|
|
|
|
switch (d->action) {
|
|
case CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE:
|
|
dev_info(ddata->dev, "Coulomb counter calibration done\n");
|
|
break;
|
|
case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW:
|
|
if (latest->current_ua >= 0)
|
|
dev_warn(ddata->dev, "Battery low at %imV!\n",
|
|
latest->voltage / 1000);
|
|
break;
|
|
case CPCAP_BATTERY_IRQ_ACTION_POWEROFF:
|
|
if (latest->current_ua >= 0 && latest->voltage <= 3200000) {
|
|
dev_emerg(ddata->dev,
|
|
"Battery empty at %imV, powering off\n",
|
|
latest->voltage / 1000);
|
|
orderly_poweroff(true);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
power_supply_changed(ddata->psy);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int cpcap_battery_init_irq(struct platform_device *pdev,
|
|
struct cpcap_battery_ddata *ddata,
|
|
const char *name)
|
|
{
|
|
struct cpcap_interrupt_desc *d;
|
|
int irq, error;
|
|
|
|
irq = platform_get_irq_byname(pdev, name);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
error = devm_request_threaded_irq(ddata->dev, irq, NULL,
|
|
cpcap_battery_irq_thread,
|
|
IRQF_SHARED | IRQF_ONESHOT,
|
|
name, ddata);
|
|
if (error) {
|
|
dev_err(ddata->dev, "could not get irq %s: %i\n",
|
|
name, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
d->name = name;
|
|
d->irq = irq;
|
|
|
|
if (!strncmp(name, "cccal", 5))
|
|
d->action = CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE;
|
|
else if (!strncmp(name, "lowbph", 6))
|
|
d->action = CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW;
|
|
else if (!strncmp(name, "lowbpl", 6))
|
|
d->action = CPCAP_BATTERY_IRQ_ACTION_POWEROFF;
|
|
|
|
list_add(&d->node, &ddata->irq_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_battery_init_interrupts(struct platform_device *pdev,
|
|
struct cpcap_battery_ddata *ddata)
|
|
{
|
|
static const char * const cpcap_battery_irqs[] = {
|
|
"eol", "lowbph", "lowbpl",
|
|
"chrgcurr1", "battdetb"
|
|
};
|
|
int i, error;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cpcap_battery_irqs); i++) {
|
|
error = cpcap_battery_init_irq(pdev, ddata,
|
|
cpcap_battery_irqs[i]);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/* Enable calibration interrupt if already available in dts */
|
|
cpcap_battery_init_irq(pdev, ddata, "cccal");
|
|
|
|
/* Enable low battery interrupts for 3.3V high and 3.1V low */
|
|
error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
|
|
0xffff,
|
|
CPCAP_REG_BPEOL_BIT_BATTDETEN);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata)
|
|
{
|
|
const char * const names[CPCAP_BATTERY_IIO_NR] = {
|
|
"battdetb", "battp", "chg_isense", "batti",
|
|
};
|
|
int error, i;
|
|
|
|
for (i = 0; i < CPCAP_BATTERY_IIO_NR; i++) {
|
|
ddata->channels[i] = devm_iio_channel_get(ddata->dev,
|
|
names[i]);
|
|
if (IS_ERR(ddata->channels[i])) {
|
|
error = PTR_ERR(ddata->channels[i]);
|
|
goto out_err;
|
|
}
|
|
|
|
if (!ddata->channels[i]->indio_dev) {
|
|
error = -ENXIO;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
return dev_err_probe(ddata->dev, error,
|
|
"could not initialize VBUS or ID IIO\n");
|
|
}
|
|
|
|
/* Calibrate coulomb counter */
|
|
static int cpcap_battery_calibrate(struct cpcap_battery_ddata *ddata)
|
|
{
|
|
int error, ccc1, value;
|
|
unsigned long timeout;
|
|
|
|
error = regmap_read(ddata->reg, CPCAP_REG_CCC1, &ccc1);
|
|
if (error)
|
|
return error;
|
|
|
|
timeout = jiffies + msecs_to_jiffies(6000);
|
|
|
|
/* Start calibration */
|
|
error = regmap_update_bits(ddata->reg, CPCAP_REG_CCC1,
|
|
0xffff,
|
|
CPCAP_REG_CCC1_CAL_EN);
|
|
if (error)
|
|
goto restore;
|
|
|
|
while (time_before(jiffies, timeout)) {
|
|
error = regmap_read(ddata->reg, CPCAP_REG_CCC1, &value);
|
|
if (error)
|
|
goto restore;
|
|
|
|
if (!(value & CPCAP_REG_CCC1_CAL_EN))
|
|
break;
|
|
|
|
error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
|
|
if (error)
|
|
goto restore;
|
|
|
|
msleep(300);
|
|
}
|
|
|
|
/* Read calibration offset from CCM */
|
|
error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
|
|
if (error)
|
|
goto restore;
|
|
|
|
dev_info(ddata->dev, "calibration done: 0x%04x\n", value);
|
|
|
|
restore:
|
|
if (error)
|
|
dev_err(ddata->dev, "%s: error %i\n", __func__, error);
|
|
|
|
error = regmap_update_bits(ddata->reg, CPCAP_REG_CCC1,
|
|
0xffff, ccc1);
|
|
if (error)
|
|
dev_err(ddata->dev, "%s: restore error %i\n",
|
|
__func__, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Based on the values from Motorola mapphone Linux kernel. In the
|
|
* the Motorola mapphone Linux kernel tree the value for pm_cd_factor
|
|
* is passed to the kernel via device tree. If it turns out to be
|
|
* something device specific we can consider that too later.
|
|
*
|
|
* And looking at the battery full and shutdown values for the stock
|
|
* kernel on droid 4, full is 4351000 and software initiates shutdown
|
|
* at 3078000. The device will die around 2743000.
|
|
*/
|
|
static const struct cpcap_battery_config cpcap_battery_default_data = {
|
|
.cd_factor = 0x3cc,
|
|
.info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
|
|
.info.voltage_max_design = 4351000,
|
|
.info.voltage_min_design = 3100000,
|
|
.info.charge_full_design = 1740000,
|
|
.bat.constant_charge_voltage_max_uv = 4200000,
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id cpcap_battery_id_table[] = {
|
|
{
|
|
.compatible = "motorola,cpcap-battery",
|
|
.data = &cpcap_battery_default_data,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, cpcap_battery_id_table);
|
|
#endif
|
|
|
|
static const struct power_supply_desc cpcap_charger_battery_desc = {
|
|
.name = "battery",
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.properties = cpcap_battery_props,
|
|
.num_properties = ARRAY_SIZE(cpcap_battery_props),
|
|
.get_property = cpcap_battery_get_property,
|
|
.set_property = cpcap_battery_set_property,
|
|
.property_is_writeable = cpcap_battery_property_is_writeable,
|
|
.external_power_changed = cpcap_battery_external_power_changed,
|
|
};
|
|
|
|
static int cpcap_battery_probe(struct platform_device *pdev)
|
|
{
|
|
struct cpcap_battery_ddata *ddata;
|
|
const struct of_device_id *match;
|
|
struct power_supply_config psy_cfg = {};
|
|
int error;
|
|
|
|
match = of_match_device(of_match_ptr(cpcap_battery_id_table),
|
|
&pdev->dev);
|
|
if (!match)
|
|
return -EINVAL;
|
|
|
|
if (!match->data) {
|
|
dev_err(&pdev->dev, "no configuration data found\n");
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
|
|
if (!ddata)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&ddata->irq_list);
|
|
ddata->dev = &pdev->dev;
|
|
memcpy(&ddata->config, match->data, sizeof(ddata->config));
|
|
|
|
ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
|
|
if (!ddata->reg)
|
|
return -ENODEV;
|
|
|
|
error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor);
|
|
if (error)
|
|
return error;
|
|
|
|
switch (ddata->vendor) {
|
|
case CPCAP_VENDOR_ST:
|
|
ddata->cc_lsb = 95374; /* μAms per LSB */
|
|
break;
|
|
case CPCAP_VENDOR_TI:
|
|
ddata->cc_lsb = 91501; /* μAms per LSB */
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
ddata->cc_lsb = (ddata->cc_lsb * ddata->config.cd_factor) / 1000;
|
|
|
|
platform_set_drvdata(pdev, ddata);
|
|
|
|
error = cpcap_battery_init_interrupts(pdev, ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = cpcap_battery_init_iio(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
psy_cfg.of_node = pdev->dev.of_node;
|
|
psy_cfg.drv_data = ddata;
|
|
|
|
ddata->psy = devm_power_supply_register(ddata->dev,
|
|
&cpcap_charger_battery_desc,
|
|
&psy_cfg);
|
|
error = PTR_ERR_OR_ZERO(ddata->psy);
|
|
if (error) {
|
|
dev_err(ddata->dev, "failed to register power supply\n");
|
|
return error;
|
|
}
|
|
|
|
atomic_set(&ddata->active, 1);
|
|
|
|
error = cpcap_battery_calibrate(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_battery_remove(struct platform_device *pdev)
|
|
{
|
|
struct cpcap_battery_ddata *ddata = platform_get_drvdata(pdev);
|
|
int error;
|
|
|
|
atomic_set(&ddata->active, 0);
|
|
error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
|
|
0xffff, 0);
|
|
if (error)
|
|
dev_err(&pdev->dev, "could not disable: %i\n", error);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver cpcap_battery_driver = {
|
|
.driver = {
|
|
.name = "cpcap_battery",
|
|
.of_match_table = of_match_ptr(cpcap_battery_id_table),
|
|
},
|
|
.probe = cpcap_battery_probe,
|
|
.remove = cpcap_battery_remove,
|
|
};
|
|
module_platform_driver(cpcap_battery_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
|
|
MODULE_DESCRIPTION("CPCAP PMIC Battery Driver");
|