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linux/drivers/power/supply/ucs1002_power.c
Lucas Stach 81196e2e57 power: supply: ucs1002: fix some health status issues 
Some fault events like the over-current condition will get resolved
by the hardware, by e.g. disabling the port. As the status in the
interrupt status register is cleared on read when the fault is resolved,
the sysfs health property will only contain the correct health status
for the first time it is read after such an event, even if the actual
fault condition (like a VBUS short) still persists. To reflect this
properly in the property we cache the last health status and only update
the cache when a actual change happens, i.e. the ERR bit in the status
register flips, as this one properly reflects a continued fault condition.

The ALERT pin however, is not driven by the ERR status, but by the actual
fault status, so the pin will change back to it's default state when the
hardware has automatically resolved the fault by cutting the power. Thus
we never get an IRQ when the actual fault condition has been resolved and
the ERR status bit has been cleared in auto-recovery mode. To get this
information we need to poll the interrupt status register after some time
to see if the fault is gone and update our cache in that case.

To avoid any additional locking, we handle both paths (IRQ firing and
delayed polling) through the same single-threaded delayed work.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2020-10-01 00:18:05 +02:00

692 lines
18 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for UCS1002 Programmable USB Port Power Controller
*
* Copyright (C) 2019 Zodiac Inflight Innovations
*/
#include <linux/bits.h>
#include <linux/freezer.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
/* UCS1002 Registers */
#define UCS1002_REG_CURRENT_MEASUREMENT 0x00
/*
* The Total Accumulated Charge registers store the total accumulated
* charge delivered from the VS source to a portable device. The total
* value is calculated using four registers, from 01h to 04h. The bit
* weighting of the registers is given in mA/hrs.
*/
#define UCS1002_REG_TOTAL_ACC_CHARGE 0x01
/* Other Status Register */
#define UCS1002_REG_OTHER_STATUS 0x0f
# define F_ADET_PIN BIT(4)
# define F_CHG_ACT BIT(3)
/* Interrupt Status */
#define UCS1002_REG_INTERRUPT_STATUS 0x10
# define F_ERR BIT(7)
# define F_DISCHARGE_ERR BIT(6)
# define F_RESET BIT(5)
# define F_MIN_KEEP_OUT BIT(4)
# define F_TSD BIT(3)
# define F_OVER_VOLT BIT(2)
# define F_BACK_VOLT BIT(1)
# define F_OVER_ILIM BIT(0)
/* Pin Status Register */
#define UCS1002_REG_PIN_STATUS 0x14
# define UCS1002_PWR_STATE_MASK 0x03
# define F_PWR_EN_PIN BIT(6)
# define F_M2_PIN BIT(5)
# define F_M1_PIN BIT(4)
# define F_EM_EN_PIN BIT(3)
# define F_SEL_PIN BIT(2)
# define F_ACTIVE_MODE_MASK GENMASK(5, 3)
# define F_ACTIVE_MODE_PASSTHROUGH F_M2_PIN
# define F_ACTIVE_MODE_DEDICATED F_EM_EN_PIN
# define F_ACTIVE_MODE_BC12_DCP (F_M2_PIN | F_EM_EN_PIN)
# define F_ACTIVE_MODE_BC12_SDP F_M1_PIN
# define F_ACTIVE_MODE_BC12_CDP (F_M1_PIN | F_M2_PIN | F_EM_EN_PIN)
/* General Configuration Register */
#define UCS1002_REG_GENERAL_CFG 0x15
# define F_RATION_EN BIT(3)
/* Emulation Configuration Register */
#define UCS1002_REG_EMU_CFG 0x16
/* Switch Configuration Register */
#define UCS1002_REG_SWITCH_CFG 0x17
# define F_PIN_IGNORE BIT(7)
# define F_EM_EN_SET BIT(5)
# define F_M2_SET BIT(4)
# define F_M1_SET BIT(3)
# define F_S0_SET BIT(2)
# define F_PWR_EN_SET BIT(1)
# define F_LATCH_SET BIT(0)
# define V_SET_ACTIVE_MODE_MASK GENMASK(5, 3)
# define V_SET_ACTIVE_MODE_PASSTHROUGH F_M2_SET
# define V_SET_ACTIVE_MODE_DEDICATED F_EM_EN_SET
# define V_SET_ACTIVE_MODE_BC12_DCP (F_M2_SET | F_EM_EN_SET)
# define V_SET_ACTIVE_MODE_BC12_SDP F_M1_SET
# define V_SET_ACTIVE_MODE_BC12_CDP (F_M1_SET | F_M2_SET | F_EM_EN_SET)
/* Current Limit Register */
#define UCS1002_REG_ILIMIT 0x19
# define UCS1002_ILIM_SW_MASK GENMASK(3, 0)
/* Product ID */
#define UCS1002_REG_PRODUCT_ID 0xfd
# define UCS1002_PRODUCT_ID 0x4e
/* Manufacture name */
#define UCS1002_MANUFACTURER "SMSC"
struct ucs1002_info {
struct power_supply *charger;
struct i2c_client *client;
struct regmap *regmap;
struct regulator_desc *regulator_descriptor;
struct regulator_dev *rdev;
bool present;
bool output_disable;
struct delayed_work health_poll;
int health;
};
static enum power_supply_property ucs1002_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_HEALTH,
};
static int ucs1002_get_online(struct ucs1002_info *info,
union power_supply_propval *val)
{
unsigned int reg;
int ret;
ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &reg);
if (ret)
return ret;
val->intval = !!(reg & F_CHG_ACT);
return 0;
}
static int ucs1002_get_charge(struct ucs1002_info *info,
union power_supply_propval *val)
{
/*
* To fit within 32 bits some values are rounded (uA/h)
*
* For Total Accumulated Charge Middle Low Byte register, addr
* 03h, byte 2
*
* B0: 0.01084 mA/h rounded to 11 uA/h
* B1: 0.02169 mA/h rounded to 22 uA/h
* B2: 0.04340 mA/h rounded to 43 uA/h
* B3: 0.08676 mA/h rounded to 87 uA/h
* B4: 0.17350 mA/h rounded to 173 uÁ/h
*
* For Total Accumulated Charge Low Byte register, addr 04h,
* byte 3
*
* B6: 0.00271 mA/h rounded to 3 uA/h
* B7: 0.005422 mA/h rounded to 5 uA/h
*/
static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = {
/*
* Bit corresponding to low byte (offset 0x04)
* B0 B1 B2 B3 B4 B5 B6 B7
*/
0, 0, 0, 0, 0, 0, 3, 5,
/*
* Bit corresponding to middle low byte (offset 0x03)
* B0 B1 B2 B3 B4 B5 B6 B7
*/
11, 22, 43, 87, 173, 347, 694, 1388,
/*
* Bit corresponding to middle high byte (offset 0x02)
* B0 B1 B2 B3 B4 B5 B6 B7
*/
2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400,
/*
* Bit corresponding to high byte (offset 0x01)
* B0 B1 B2 B3 B4 B5 B6 B7
*/
710700, 1421000, 2843000, 5685000, 11371000, 22742000,
45484000, 90968000,
};
unsigned long total_acc_charger;
unsigned int reg;
int i, ret;
ret = regmap_bulk_read(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
&reg, sizeof(u32));
if (ret)
return ret;
total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */
val->intval = 0;
for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh))
val->intval += bit_weights_uAh[i];
return 0;
}
static int ucs1002_get_current(struct ucs1002_info *info,
union power_supply_propval *val)
{
/*
* The Current Measurement register stores the measured
* current value delivered to the portable device. The range
* is from 9.76 mA to 2.5 A.
*/
static const int bit_weights_uA[BITS_PER_TYPE(u8)] = {
9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300,
};
unsigned long current_measurement;
unsigned int reg;
int i, ret;
ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, &reg);
if (ret)
return ret;
current_measurement = reg;
val->intval = 0;
for_each_set_bit(i, &current_measurement, ARRAY_SIZE(bit_weights_uA))
val->intval += bit_weights_uA[i];
return 0;
}
/*
* The Current Limit register stores the maximum current used by the
* port switch. The range is from 500mA to 2.5 A.
*/
static const u32 ucs1002_current_limit_uA[] = {
500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000,
};
static int ucs1002_get_max_current(struct ucs1002_info *info,
union power_supply_propval *val)
{
unsigned int reg;
int ret;
if (info->output_disable) {
val->intval = 0;
return 0;
}
ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
if (ret)
return ret;
val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK];
return 0;
}
static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
{
unsigned int reg;
int ret, idx;
if (val == 0) {
info->output_disable = true;
regulator_disable_regmap(info->rdev);
return 0;
}
for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) {
if (val == ucs1002_current_limit_uA[idx])
break;
}
if (idx == ARRAY_SIZE(ucs1002_current_limit_uA))
return -EINVAL;
ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx);
if (ret)
return ret;
/*
* Any current limit setting exceeding the one set via ILIM
* pin will be rejected, so we read out freshly changed limit
* to make sure that it took effect.
*/
ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
if (ret)
return ret;
if (reg != idx)
return -EINVAL;
info->output_disable = false;
if (info->rdev && info->rdev->use_count &&
!regulator_is_enabled_regmap(info->rdev))
regulator_enable_regmap(info->rdev);
return 0;
}
static enum power_supply_usb_type ucs1002_usb_types[] = {
POWER_SUPPLY_USB_TYPE_PD,
POWER_SUPPLY_USB_TYPE_SDP,
POWER_SUPPLY_USB_TYPE_DCP,
POWER_SUPPLY_USB_TYPE_CDP,
POWER_SUPPLY_USB_TYPE_UNKNOWN,
};
static int ucs1002_set_usb_type(struct ucs1002_info *info, int val)
{
unsigned int mode;
if (val < 0 || val >= ARRAY_SIZE(ucs1002_usb_types))
return -EINVAL;
switch (ucs1002_usb_types[val]) {
case POWER_SUPPLY_USB_TYPE_PD:
mode = V_SET_ACTIVE_MODE_DEDICATED;
break;
case POWER_SUPPLY_USB_TYPE_SDP:
mode = V_SET_ACTIVE_MODE_BC12_SDP;
break;
case POWER_SUPPLY_USB_TYPE_DCP:
mode = V_SET_ACTIVE_MODE_BC12_DCP;
break;
case POWER_SUPPLY_USB_TYPE_CDP:
mode = V_SET_ACTIVE_MODE_BC12_CDP;
break;
default:
return -EINVAL;
}
return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
V_SET_ACTIVE_MODE_MASK, mode);
}
static int ucs1002_get_usb_type(struct ucs1002_info *info,
union power_supply_propval *val)
{
enum power_supply_usb_type type;
unsigned int reg;
int ret;
ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &reg);
if (ret)
return ret;
switch (reg & F_ACTIVE_MODE_MASK) {
default:
type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
break;
case F_ACTIVE_MODE_DEDICATED:
type = POWER_SUPPLY_USB_TYPE_PD;
break;
case F_ACTIVE_MODE_BC12_SDP:
type = POWER_SUPPLY_USB_TYPE_SDP;
break;
case F_ACTIVE_MODE_BC12_DCP:
type = POWER_SUPPLY_USB_TYPE_DCP;
break;
case F_ACTIVE_MODE_BC12_CDP:
type = POWER_SUPPLY_USB_TYPE_CDP;
break;
}
val->intval = type;
return 0;
}
static int ucs1002_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ucs1002_info *info = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
return ucs1002_get_online(info, val);
case POWER_SUPPLY_PROP_CHARGE_NOW:
return ucs1002_get_charge(info, val);
case POWER_SUPPLY_PROP_CURRENT_NOW:
return ucs1002_get_current(info, val);
case POWER_SUPPLY_PROP_CURRENT_MAX:
return ucs1002_get_max_current(info, val);
case POWER_SUPPLY_PROP_USB_TYPE:
return ucs1002_get_usb_type(info, val);
case POWER_SUPPLY_PROP_HEALTH:
return val->intval = info->health;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = info->present;
return 0;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = UCS1002_MANUFACTURER;
return 0;
default:
return -EINVAL;
}
}
static int ucs1002_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct ucs1002_info *info = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_CURRENT_MAX:
return ucs1002_set_max_current(info, val->intval);
case POWER_SUPPLY_PROP_USB_TYPE:
return ucs1002_set_usb_type(info, val->intval);
default:
return -EINVAL;
}
}
static int ucs1002_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CURRENT_MAX:
case POWER_SUPPLY_PROP_USB_TYPE:
return true;
default:
return false;
}
}
static const struct power_supply_desc ucs1002_charger_desc = {
.name = "ucs1002",
.type = POWER_SUPPLY_TYPE_USB,
.usb_types = ucs1002_usb_types,
.num_usb_types = ARRAY_SIZE(ucs1002_usb_types),
.get_property = ucs1002_get_property,
.set_property = ucs1002_set_property,
.property_is_writeable = ucs1002_property_is_writeable,
.properties = ucs1002_props,
.num_properties = ARRAY_SIZE(ucs1002_props),
};
static void ucs1002_health_poll(struct work_struct *work)
{
struct ucs1002_info *info = container_of(work, struct ucs1002_info,
health_poll.work);
int ret;
u32 reg;
ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, &reg);
if (ret)
return;
/* bad health and no status change, just schedule us again in a while */
if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) {
schedule_delayed_work(&info->health_poll,
msecs_to_jiffies(2000));
return;
}
if (reg & F_TSD)
info->health = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (reg & (F_OVER_VOLT | F_BACK_VOLT))
info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else if (reg & F_OVER_ILIM)
info->health = POWER_SUPPLY_HEALTH_OVERCURRENT;
else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT))
info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
else
info->health = POWER_SUPPLY_HEALTH_GOOD;
sysfs_notify(&info->charger->dev.kobj, NULL, "health");
}
static irqreturn_t ucs1002_charger_irq(int irq, void *data)
{
int ret, regval;
bool present;
struct ucs1002_info *info = data;
present = info->present;
ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &regval);
if (ret)
return IRQ_HANDLED;
/* update attached status */
info->present = regval & F_ADET_PIN;
/* notify the change */
if (present != info->present)
power_supply_changed(info->charger);
return IRQ_HANDLED;
}
static irqreturn_t ucs1002_alert_irq(int irq, void *data)
{
struct ucs1002_info *info = data;
mod_delayed_work(system_wq, &info->health_poll, 0);
return IRQ_HANDLED;
}
static int ucs1002_regulator_enable(struct regulator_dev *rdev)
{
struct ucs1002_info *info = rdev_get_drvdata(rdev);
/*
* If the output is disabled due to 0 maximum current, just pretend the
* enable did work. The regulator will be enabled as soon as we get a
* a non-zero maximum current budget.
*/
if (info->output_disable)
return 0;
return regulator_enable_regmap(rdev);
}
static const struct regulator_ops ucs1002_regulator_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = ucs1002_regulator_enable,
.disable = regulator_disable_regmap,
};
static const struct regulator_desc ucs1002_regulator_descriptor = {
.name = "ucs1002-vbus",
.ops = &ucs1002_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = UCS1002_REG_SWITCH_CFG,
.enable_mask = F_PWR_EN_SET,
.enable_val = F_PWR_EN_SET,
.fixed_uV = 5000000,
.n_voltages = 1,
};
static int ucs1002_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct device *dev = &client->dev;
struct power_supply_config charger_config = {};
const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
struct regulator_config regulator_config = {};
int irq_a_det, irq_alert, ret;
struct ucs1002_info *info;
unsigned int regval;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->regmap = devm_regmap_init_i2c(client, &regmap_config);
ret = PTR_ERR_OR_ZERO(info->regmap);
if (ret) {
dev_err(dev, "Regmap initialization failed: %d\n", ret);
return ret;
}
info->client = client;
irq_a_det = of_irq_get_byname(dev->of_node, "a_det");
irq_alert = of_irq_get_byname(dev->of_node, "alert");
charger_config.of_node = dev->of_node;
charger_config.drv_data = info;
ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, &regval);
if (ret) {
dev_err(dev, "Failed to read product ID: %d\n", ret);
return ret;
}
if (regval != UCS1002_PRODUCT_ID) {
dev_err(dev,
"Product ID does not match (0x%02x != 0x%02x)\n",
regval, UCS1002_PRODUCT_ID);
return -ENODEV;
}
/* Enable charge rationing by default */
ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG,
F_RATION_EN, F_RATION_EN);
if (ret) {
dev_err(dev, "Failed to read general config: %d\n", ret);
return ret;
}
/*
* Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active
* mode selection to BC1.2 CDP.
*/
ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE,
V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE);
if (ret) {
dev_err(dev, "Failed to configure default mode: %d\n", ret);
return ret;
}
/*
* Be safe and set initial current limit to 500mA
*/
ret = ucs1002_set_max_current(info, 500000);
if (ret) {
dev_err(dev, "Failed to set max current default: %d\n", ret);
return ret;
}
info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc,
&charger_config);
ret = PTR_ERR_OR_ZERO(info->charger);
if (ret) {
dev_err(dev, "Failed to register power supply: %d\n", ret);
return ret;
}
ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &regval);
if (ret) {
dev_err(dev, "Failed to read pin status: %d\n", ret);
return ret;
}
info->regulator_descriptor =
devm_kmemdup(dev, &ucs1002_regulator_descriptor,
sizeof(ucs1002_regulator_descriptor),
GFP_KERNEL);
if (!info->regulator_descriptor)
return -ENOMEM;
info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN);
regulator_config.dev = dev;
regulator_config.of_node = dev->of_node;
regulator_config.regmap = info->regmap;
regulator_config.driver_data = info;
info->rdev = devm_regulator_register(dev, info->regulator_descriptor,
&regulator_config);
ret = PTR_ERR_OR_ZERO(info->rdev);
if (ret) {
dev_err(dev, "Failed to register VBUS regulator: %d\n", ret);
return ret;
}
info->health = POWER_SUPPLY_HEALTH_GOOD;
INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll);
if (irq_a_det > 0) {
ret = devm_request_threaded_irq(dev, irq_a_det, NULL,
ucs1002_charger_irq,
IRQF_ONESHOT,
"ucs1002-a_det", info);
if (ret) {
dev_err(dev, "Failed to request A_DET threaded irq: %d\n",
ret);
return ret;
}
}
if (irq_alert > 0) {
ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq,
0,"ucs1002-alert", info);
if (ret) {
dev_err(dev, "Failed to request ALERT threaded irq: %d\n",
ret);
return ret;
}
}
return 0;
}
static const struct of_device_id ucs1002_of_match[] = {
{ .compatible = "microchip,ucs1002", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ucs1002_of_match);
static struct i2c_driver ucs1002_driver = {
.driver = {
.name = "ucs1002",
.of_match_table = ucs1002_of_match,
},
.probe = ucs1002_probe,
};
module_i2c_driver(ucs1002_driver);
MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
MODULE_LICENSE("GPL");
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