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Date: Fri, 13 Mar 2020 11:11:24 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Tobias Schramm <t.schramm@...jaro.org>
Cc: Sebastian Reichel <sre@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Daniel Thompson <daniel.thompson@...aro.org>,
Maxime Ripard <mripard@...nel.org>,
Sam Ravnborg <sam@...nborg.org>,
Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
Stephan Gerhold <stephan@...hold.net>,
Mark Brown <broonie@...nel.org>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] power: supply: add CellWise cw2015 fuel gauge
driver
On Thu, Mar 12, 2020 at 11:24:48PM +0100, Tobias Schramm wrote:
> This patch adds a driver for the CellWise cw2015 fuel gauge.
>
> The CellWise cw2015 is a shuntless, single-cell Li-Ion fuel gauge used
> in the pine64 Pinebook Pro laptop and some Raspberry Pi UPS HATs.
Thank you for an update!
My comments below.
...
> +config BATTERY_CW2015
> + tristate "CW2015 Battery driver"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + Say Y here to enable support for the cellwise cw2015
> + battery fuel gauge (used in the Pinebook Pro & others)
AFAIK, it's a good tone to include module name in help string.
...
> +#include <linux/bits.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/time.h>
> +#include <linux/timekeeping.h>
> +#include <linux/workqueue.h>
Can you, please, double check if all of this are indeed have users in the
driver?
...
> + dev_err(cw_bat->dev,
> + "Failed to upload battery info\n");
Indentation of the second line.
...
> + ret = regmap_raw_read(cw_bat->regmap, CW2015_REG_BATINFO,
> + bat_info, CW2015_SIZE_BATINFO);
Ditto.
> + dev_err(cw_bat->dev,
> + "Failed to read stored battery profile\n");
Ditto.
> + dev_warn(cw_bat->dev,
> + "Can't check current battery profile, no profile provided");
Ditto.
...
> + dev_warn(cw_bat->dev,
> + "Too many invalid SoC reports, resetting gauge");
Ditto.
> + dev_warn(cw_bat->dev,
> + "SoC stuck @%u%%, resetting gauge", soc);
Ditto.
...
> +static void cw_bat_work(struct work_struct *work)
> +{
> + struct delayed_work *delay_work;
> + struct cw_battery *cw_bat;
> + int ret;
> + unsigned int reg_val;
> + int i = 0;
Looks like redundant assignment.
> + delay_work = to_delayed_work(work);
> + cw_bat = container_of(delay_work, struct cw_battery, battery_delay_work);
> + ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, ®_val);
> + if (ret) {
> + dev_err(cw_bat->dev, "Failed to read mode from gauge: %d", ret);
> + } else {
> + if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
> + for (i = 0; i < CW2015_RESET_TRIES; i++) {
> + if (!cw_power_on_reset(cw_bat))
> + break;
> + }
> + }
> + cw_update_soc(cw_bat);
> + cw_update_voltage(cw_bat);
> + cw_update_charge_status(cw_bat);
> + cw_update_status(cw_bat);
> + cw_update_time_to_empty(cw_bat);
> + }
> + if (cw_bat->battery_changed)
> + power_supply_changed(cw_bat->rk_bat);
> + cw_bat->battery_changed = false;
> +
> + queue_delayed_work(cw_bat->battery_workqueue,
> + &cw_bat->battery_delay_work,
> + msecs_to_jiffies(cw_bat->poll_interval_ms));
> +}
...
> +static int cw_battery_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + int ret = 0;
Don't see how this is being used.
> + struct cw_battery *cw_bat;
> + case POWER_SUPPLY_PROP_CURRENT_NOW:
> + if (cw_battery_valid_time_to_empty(cw_bat) &&
> + cw_bat->battery.charge_full_design_uah > 0) {
> + /* calculate remaining capacity */
> + val->intval = cw_bat->battery.charge_full_design_uah;
> + val->intval = val->intval * cw_bat->soc / 100;
> +
> + /* estimate current based on time to empty */
> + val->intval = 60 * val->intval / cw_bat->time_to_empty;
> + } else {
> + val->intval = 0;
> + }
> +
> + break;
> +
> + default:
> + break;
> + }
> + return ret;
> +}
...
> +static int cw2015_parse_properties(struct cw_battery *cw_bat)
> +{
> + struct device *dev = cw_bat->dev;
> + int length;
> + u32 value;
> + int ret;
> +
> + length = device_property_count_u8(dev, "cellwise,battery-profile");
> + if (length) {
Now it seems we have an issue here because return value can be negative error code.
And I'm thinking that we may refactor this function. So,
length = ..._count_u8(...);
if (length < 0) {
dev_warn(...);
} else if (length != ...) {
dev_err(...);
...
} else {
...
}
> + if (length != CW2015_SIZE_BATINFO) {
> + dev_err(cw_bat->dev, "battery-profile must be %d bytes",
> + CW2015_SIZE_BATINFO);
> + return -EINVAL;
> + }
> +
> + cw_bat->bat_profile = devm_kzalloc(dev, length, GFP_KERNEL);
> + if (!cw_bat->bat_profile) {
> + dev_err(cw_bat->dev,
> + "Failed to allocate memory for battery config info");
> + return -ENOMEM;
> + }
> +
> + ret = device_property_read_u8_array(dev,
> + "cellwise,battery-profile",
> + cw_bat->bat_profile,
> + length);
> + if (ret)
> + return ret;
> + } else {
> + dev_warn(cw_bat->dev,
> + "No battery-profile found, rolling with current flash contents");
> + }
> +
...and here...
> + cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS;
> + ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms", &value);
> + if (ret >= 0) {
> + dev_dbg(cw_bat->dev, "Overriding default monitor-interval with %u ms",
> + value);
> + cw_bat->poll_interval_ms = value;
> + }
ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms", &cw_bat->poll_interval_ms);
if (ret) {
dev_dbg(cw_bat->dev, "Use default\n");
cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS;
}
What do you think?
> +
> + return 0;
> +}
...
> +static int cw_bat_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
By the way, can you switch to ->probe_new() ?
> +{
> + int ret;
> + struct cw_battery *cw_bat;
> + struct power_supply_config psy_cfg = { };
Don't you need 0 here?
> + psy_cfg.drv_data = cw_bat;
> + psy_cfg.fwnode = dev_fwnode(cw_bat->dev);
> +
> + cw_bat->rk_bat = devm_power_supply_register(&client->dev,
> + &cw2015_bat_desc, &psy_cfg);
> + if (IS_ERR(cw_bat->rk_bat)) {
> + dev_err(cw_bat->dev, "Failed to register power supply");
> + return PTR_ERR(cw_bat->rk_bat);
> + }
> +
> + ret = power_supply_get_battery_info(cw_bat->rk_bat, &cw_bat->battery);
> + if (ret) {
> + dev_warn(cw_bat->dev,
> + "No monitored battery, some properties will be missing");
'\n' is missed (please, check all messages.
> + }
> +
> + cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery");
> + INIT_DELAYED_WORK(&cw_bat->battery_delay_work, cw_bat_work);
> + queue_delayed_work(cw_bat->battery_workqueue,
> + &cw_bat->battery_delay_work, msecs_to_jiffies(10));
> + return 0;
> +}
--
With Best Regards,
Andy Shevchenko
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