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Date: Wed, 26 Sep 2018 12:58:09 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: Bastien Nocera <hadess@...ess.net>,
Stephen Just <stephenjust@...il.com>,
Sebastian Reichel <sre@...nel.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Darren Hart <dvhart@...radead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v3] platform/x86: surface3_power: MSHW0011 rev-eng implementation
On Fri, Aug 31, 2018 at 6:18 PM Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
>
> The MSHW0011 device is a chip that replaces the battery firmware
> by using ACPI operation regions on the Surface 3.
> It is unclear whether or not the chip will be reused somewhere else
> (under Windows, the chip is called "Surface Platform Power Driver"
> and the driver is provided by Microsoft).
>
> The values have been obtained by reverse engineering, and are subject to
> errors. Looks like it works on overall pretty well.
>
> I couldn't manage to get the IRQ correctly triggered, so I am using a
> good old polling thread to check for changes. This is something
> to be fixed in a later version.
I have pushed to my review and testing queue for bots playing with it!
But below my review.
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=106231
>
Remove this blank line.
> +// SPDX-License-Identifier: GPL-2.0+
> +
No need for this blank line either.
> +/*
> + * Supports for the power IC on the Surface 3 tablet.
> + *
> + * (C) Copyright 2016-2018 Red Hat, Inc
> + * (C) Copyright 2016-2018 Benjamin Tissoires <benjamin.tissoires@...il.com>
> + * (C) Copyright 2016 Stephen Just <stephenjust@...il.com>
> + *
...and for this.
> + */
> +#include <asm/unaligned.h>
I'm pretty sure this should go after linux/*.h ones
> +#include <linux/acpi.h>
> +#include <linux/freezer.h>
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/kthread.h>
> +#include <linux/slab.h>
> +#include <linux/uuid.h>
> + char model[10];
> + char serial[10];
> + char type[10];
> + char OEM[10];
These 10:s is something worth to define:
#define SURFACE_3_STRLEN 10
or alike.
> +
> +
One blank line is enough
> +#define MSHW0011_EV_2_5 0x1ff
Is it mask? Value? Some threshold?
> + static const guid_t mshw0011_guid =
> + GUID_INIT(0x3F99E367, 0x6220, 0x4955,
> + 0x8B, 0x0F, 0x06, 0xEF, 0x2A, 0xE7, 0x94, 0x12);
Can you move this outside of the function?
> + char buf[10];
Same definition as I mentioned above?
> + /* get serial number */
> + ret = i2c_smbus_read_i2c_block_data(client, MSHW0011_BAT0_REG_SERIAL_NO,
> + 10, buf);
10 -> sizeof() ?
> + if (ret != 10) {
Ditto.
> + dev_err(&client->dev, "Error reading serial no: %d\n", ret);
> + return ret;
> + }
> + snprintf(bix->serial, ARRAY_SIZE(bix->serial),
> + "%*pE%*pE", 3, buf + 7, 6, buf);
It would be one line with format string as "%3pE%6pE" followed by two pointers.
> + /* get OEM name */
> + ret = i2c_smbus_read_i2c_block_data(client, MSHW0011_BAT0_REG_OEM,
> + 4, buf);
> + if (ret != 4) {
4 to be defined? Or separate buffer?
> + dev_err(&client->dev, "Error reading cycle count: %d\n", ret);
> + return ret;
> + }
> + snprintf(bix->OEM, ARRAY_SIZE(bix->OEM), "%*pE", 3, buf);
Depending on the above it might be either "%3pE" or '...sizeof(buf) -
1, buf...'.
> + status = ret;
> +
No need to have this blank line.
> + if (status != cdata->charging)
> + mshw0011_notify(cdata, cdata->notify_mask,
> + MSHW0011_NOTIFY_ADP1, &ret);
> + bat_status = bst.battery_state;
> +
Ditto.
> + if (bat_status != cdata->bat_charging)
> + mshw0011_notify(cdata, cdata->notify_mask,
> + MSHW0011_NOTIFY_BAT0_BST, &ret);
> + ret = mshw0011_bix(cdata, &bix);
> + if (ret < 0)
> + return ret;
Unlike here, would be nice to add a blank line.
> + if (bix.last_full_charg_capacity != cdata->full_capacity)
> + mshw0011_notify(cdata, cdata->notify_mask,
> + MSHW0011_NOTIFY_BAT0_BIX, &ret);
> + if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
> + ret = AE_BAD_PARAMETER;
> + goto err;
> + }
> +
> + sb = &ares->data.i2c_serial_bus;
> + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
> + ret = AE_BAD_PARAMETER;
> + goto err;
> + }
Side note: It would be a good candidate to use my (not yet upstreamed) helper.
> + handle = ACPI_HANDLE(&client->dev);
> +
Remove this blank line.
> + if (!handle)
> + return -ENODEV;
> +static void mshw0011_remove_space_handler(struct i2c_client *client)
> +{
> + acpi_handle handle = ACPI_HANDLE(&client->dev);
> + struct mshw0011_handler_data *data;
> + acpi_status status;
> +
I would prefer to see handle assignment here followed by immediate check.
> + if (!handle)
> + return;
> + struct i2c_board_info board_info;
> + struct device *dev = &client->dev;
> + struct i2c_client *bat0;
> +
Redundant.
> + struct mshw0011_data *data;
> + int error, mask;
> + data->notify_mask = mask == MSHW0011_EV_2_5;
Since it's a mask, append _MASK and use GENMASK() above.
--
With Best Regards,
Andy Shevchenko
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