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Message-ID: <5048ECF2.8050307@nvidia.com>
Date: Thu, 6 Sep 2012 14:35:30 -0400
From: Rhyland Klein <rklein@...dia.com>
To: Olof Johansson <olof@...om.net>
CC: Anton Vorontsov <cbou@...l.ru>,
David Woodhouse <dwmw2@...radead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sbs-battery: probe should try talking to the device
On 09/06/2012 02:32 PM, Olof Johansson wrote:
> Turns out this driver doesn't actually try talking to the device at
> probe time, so if it's incorrectly configured in the device tree or
> platform data (or if the battery has been removed from the system), then
> probe will succeed and every access will sit there and time out. The
> end result is a possibly laggy system that thinks it has a battery but
> can never read status, which isn't very useful.
>
> Instead, just read any register (I chose status) at probe, and if that
> fails, don't register the device.
>
> Signed-off-by: Olof Johansson <olof@...om.net>
> ---
> drivers/power/sbs-battery.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/power/sbs-battery.c b/drivers/power/sbs-battery.c
> index a65e8f5..2f24253 100644
> --- a/drivers/power/sbs-battery.c
> +++ b/drivers/power/sbs-battery.c
> @@ -760,6 +760,16 @@ static int __devinit sbs_probe(struct i2c_client *client,
>
> skip_gpio:
>
> + /* Before we register, we need to make sure we can actually talk
> + * to the battery.
> + */
> + rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
> + if (rc < 0) {
> + dev_err(&client->dev, "%s: Failed to get device status\n",
> + __func__);
> + goto exit_psupply;
> + }
> +
> rc = power_supply_register(&client->dev, &chip->power_supply);
> if (rc) {
> dev_err(&client->dev,
>
Acked-by: Rhyland Klein <rklein@...dia.com>
--
nvpublic
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