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Date: Thu, 27 Sep 2012 17:01:15 -0700
From: Anton Vorontsov <anton.vorontsov@...aro.org>
To: mathieu.poirier@...aro.org
Cc: linux-kernel@...r.kernel.org, dwmw2@...radead.org
Subject: Re: [PATCH 34/57] power: ab8500_fg: add power cut feature for ab8505
On Tue, Sep 25, 2012 at 10:12:31AM -0600, mathieu.poirier@...aro.org wrote:
> From: Rikard Olsson <rikard.p.olsson@...ricsson.com>
>
> Add support for a power cut feature which allows user to
> configure when ab8505 should shut down system due to low
> battery.
>
> Signed-off-by: Rikard Olsson <rikard.p.olsson@...ricsson.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Martin SJOBLOM <martin.w.sjoblom@...ricsson.com>
> Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
> ---
> drivers/power/ab8500_fg.c | 488 +++++++++++++++++++++++++++++++++-
> include/linux/mfd/abx500.h | 10 +
> include/linux/mfd/abx500/ab8500-bm.h | 8 +
> 3 files changed, 502 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
> index 5e4a46b..fde189a 100644
> --- a/drivers/power/ab8500_fg.c
> +++ b/drivers/power/ab8500_fg.c
> @@ -2351,6 +2351,64 @@ static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
> dev_err(di->dev, "BattOk init write failed.\n");
> goto out;
> }
> +
> + if ((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
> + abx500_get_chip_id(di->dev) >= AB8500_CUT2P0) {
> + ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_MAX_TIME_REG,
> + di->bat->fg_params->pcut_max_time);
> +
No need for this empty line.
> + if (ret) {
> + dev_err(di->dev,
> + "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n",
> + __func__);
> + goto out;
> + };
> +
> + ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_FLAG_TIME_REG,
> + di->bat->fg_params->pcut_flag_time);
> +
Ditto...
> + if (ret) {
> + dev_err(di->dev,
> + "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n",
> + __func__);
Wrong indentation.
> + goto out;
No need for these gotos. Just return.
[...]
> return ret;
> }
> @@ -2572,22 +2630,433 @@ static ssize_t ab8500_show_capacity(struct device *dev,
> return scnprintf(buf, PAGE_SIZE, "%d\n", capacity);
> }
>
> +static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + int ret;
> + u8 reg_value;
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct ab8500_fg *di;
> +
> + di = to_ab8500_fg_device_info(psy);
This can go into the initializer.
> +
> + ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value);
> +
> + if (ret < 0) {
> + dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
> + goto fail;
As there's just one fail case, we can just return early, no need for
the label.
> + }
> +
> + return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
> +
> +fail:
> + return ret;
> +}
> +
> +static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int ret;
> + long unsigned reg_value;
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct ab8500_fg *di;
> +
> + di = to_ab8500_fg_device_info(psy);
Into initializer...
> +
> + if (kstrtoul(buf, 10, ®_value) != 0)
> + goto fail;
> +
> + if (reg_value > 0x7F) {
> + dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
> + goto fail;
No need for 'fail' label, we can just return in both cases.
Plus, currently the code would return success, even if kstroul failed
or on incorrect reg_value. That's not right, I guess the function
should return -EINVAL.
> + }
> +
> + ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
> +
> + if (ret < 0)
> + dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
> +
> +fail:
> + return count;
> +}
> +
> +static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + int ret;
> + u8 reg_value;
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct ab8500_fg *di;
> +
> + di = to_ab8500_fg_device_info(psy);
Can go into initializer.
> +
> + ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_MAX_TIME_REG, ®_value);
> +
> + if (ret < 0) {
> + dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
> + goto fail;
No need for goto.
> + }
> +
> + return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
> +
> +fail:
> + return ret;
> +
> +}
> +
> +static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int ret;
> + long unsigned int reg_value;
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct ab8500_fg *di;
> +
> + di = to_ab8500_fg_device_info(psy);
Initializer.
> +
> + if (kstrtoul(buf, 10, ®_value) != 0)
> + goto fail;
> +
> + if (reg_value > 0x7F) {
> + dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
> + goto fail;
No need for gotos, and should return -EINVAL on errors.
> + }
> +
> + ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
> +
> + if (ret < 0)
> + dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
> +
> +fail:
> + return count;
> +}
> +
> +static ssize_t ab8505_powercut_restart_read(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + int ret;
> + u8 reg_value;
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct ab8500_fg *di;
> +
> + di = to_ab8500_fg_device_info(psy);
can be initializer.
> +
> + ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
> + AB8505_RTC_PCUT_RESTART_REG, ®_value);
> +
unneeded empty line.
> + if (ret < 0) {
> + dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
> + goto fail;
no need for goto.
.....and more similar stuff in this stuff....
Does it make sense to write a macro that constructs all these
similar functions? Would save numerous lines of code.
[...]
> static struct device_attribute ab8500_fg_sysfs_psy_attrs[] = {
> __ATTR(capacity, S_IRUGO, ab8500_show_capacity, NULL),
> };
>
> +static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
> + __ATTR(powercut_flagtime, (S_IRUGO | S_IWUGO),
> + ab8505_powercut_flagtime_read,
> + ab8505_powercut_flagtime_write),
> + __ATTR(powercut_maxtime, (S_IRUGO | S_IWUGO),
> + ab8505_powercut_maxtime_read,
> + ab8505_powercut_maxtime_write),
> + __ATTR(powercut_restart_max, (S_IRUGO | S_IWUGO),
> + ab8505_powercut_restart_read,
> + ab8505_powercut_restart_write),
> + __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
> + __ATTR(powercut_restart_counter, S_IRUGO,
> + ab8505_powercut_restart_counter_read, NULL),
> + __ATTR(powercut_enable, (S_IRUGO | S_IWUGO), ab8505_powercut_read,
> + ab8505_powercut_write),
> + __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
> + __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUGO),
> + ab8505_powercut_debounce_read,
> + ab8505_powercut_debounce_write),
> + __ATTR(powercut_enable_status, S_IRUGO,
> + ab8505_powercut_enable_status_read, NULL),
Quite inconsistent wrapping. But that's just nitpicking...
Thanks,
Anton.
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