On Fri, Jan 23, 2015 at 12:46 AM, Javier Martinez Canillas
<javier.martinez@xxxxxxxxxxxxxxx> wrote:
> From: Bill Richardson <wfrichar@xxxxxxxxxxxx>
>
> Chromebooks have an Embedded Controller (EC) that is used to
> implement various functions such as keyboard, power and battery.
>
> The AP can communicate with the EC through different bus types
> such as I2C, SPI or LPC.
>
> The cros_ec mfd driver is then composed of a core driver that
> register the sub-devices as mfd cells and provide a high level
> communication interface that is used by the rest of the kernel
> and bus specific interfaces modules.
>
> Each connection method then has its own driver, which register
> with the EC driver interface-agnostic interface.
>
> Currently, there are drivers to communicate with the EC over
> I2C and SPI and this driver adds support for LPC.
>
> Signed-off-by: Bill Richardson <wfrichar@xxxxxxxxxxxx>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> ---
>
> Changes since v2:
> - Move out from drivers/mfd to drivers/misc. Suggested by Lee Jones.
>
> Changes since v1: None, new patch.
> ---
> drivers/misc/Kconfig | 10 ++
> drivers/misc/Makefile | 1 +
> drivers/misc/cros_ec_lpc.c | 306 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 317 insertions(+)
> create mode 100644 drivers/misc/cros_ec_lpc.c
(...)
> +static int cros_ec_lpc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct cros_ec_device *ec_dev;
> + int err = -ENOTTY;
> +
> + if (!request_region(EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE, MYNAME)) {
Why dont you use devres API for request_region()... Then maximum of
your goto label regarding
release region will gone...
> + dev_warn(dev, "couldn't reserve memmap region\n");
> + goto failed_memmap;
> + }
> +
> + if ((inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) != 'E') ||
> + (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1) != 'C')) {
> + dev_warn(dev, "EC ID not detected\n");
> + goto failed_ec_probe;
> + }
> +
> + if (!request_region(EC_HOST_CMD_REGION0, EC_HOST_CMD_REGION_SIZE,
> + MYNAME)) {
same...
> + dev_warn(dev, "couldn't reserve region0\n");
> + goto failed_region0;
> + }
> + if (!request_region(EC_HOST_CMD_REGION1, EC_HOST_CMD_REGION_SIZE,
> + MYNAME)) {
same ...
> + dev_warn(dev, "couldn't reserve region1\n");
> + goto failed_region1;
> + }
> +
> + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
> + if (!ec_dev) {
> + err = -ENOMEM;
> + goto failed_ec_dev;
> + }
> +
> + platform_set_drvdata(pdev, ec_dev);
> + ec_dev->dev = dev;
> + ec_dev->ec_name = pdev->name;
> + ec_dev->phys_name = dev_name(dev);
> + ec_dev->parent = dev;
> + ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc;
> + ec_dev->cmd_readmem = cros_ec_lpc_readmem;
> +
> + err = cros_ec_register(ec_dev);
> + if (err) {
> + dev_warn(dev, "couldn't register ec_dev\n");
> + goto failed_ec_dev;
> + }
> +
> + return 0;
> +
> +failed_ec_dev:
> + release_region(EC_HOST_CMD_REGION1, EC_HOST_CMD_REGION_SIZE);
> +failed_region1:
> + release_region(EC_HOST_CMD_REGION0, EC_HOST_CMD_REGION_SIZE);
> +failed_region0:
> +failed_ec_probe:
> + release_region(EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE);
All these goto labels will be gone if you use devres API..
> +failed_memmap:
> + return err;
> +}
> +
> +static int cros_ec_lpc_remove(struct platform_device *pdev)
> +{
> + struct cros_ec_device *ec_dev;
> +
> + ec_dev = platform_get_drvdata(pdev);
> + cros_ec_remove(ec_dev);
> +
> + release_region(EC_HOST_CMD_REGION1, EC_HOST_CMD_REGION_SIZE);
> + release_region(EC_HOST_CMD_REGION0, EC_HOST_CMD_REGION_SIZE);
> + release_region(EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE);
> +
These also will be gone....
--
Thanks and Regards,
Varka Bhadram.
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