Re: [PATCH v3 4/8] mfd / platform: cros_ec: move debugfs attributes to its own driver.

From: Guenter Roeck
Date: Mon Dec 10 2018 - 13:05:12 EST

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On Tue, Nov 27, 2018 at 4:19 AM Enric Balletbo i Serra
<enric.balletbo@xxxxxxxxxxxxx> wrote:
>
> The entire way how cros debugfs attibutes are created is broken.
> cros_ec_debugfs should be its own driver and its attributes should be
> associated with a debugfs driver not the mfd driver.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx>

> ---
>
> Changes in v3: None
> Changes in v2:
> - Add a "default MFD_CROS_EC_CHARDEV" in Kconfig for this.
> - Remove the checks for missing debug_info, are not needed now.
> - Remove a comment that no longer applies.
>
> drivers/mfd/cros_ec_dev.c | 41 +--------------
> drivers/platform/chrome/Kconfig | 11 ++++
> drivers/platform/chrome/Makefile | 4 +-
> drivers/platform/chrome/cros_ec_debugfs.c | 62 +++++++++++++++--------
> include/linux/mfd/cros_ec.h | 6 ---
> 5 files changed, 56 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 51325049690c..50ba8e0fb4ec 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -389,6 +389,7 @@ static const struct mfd_cell cros_usbpd_charger_cells[] = {
> };
>
> static const struct mfd_cell cros_ec_platform_cells[] = {
> + { .name = "cros-ec-debugfs" },
> { .name = "cros-ec-lightbar" },
> { .name = "cros-ec-vbc" },
> };
> @@ -483,9 +484,6 @@ static int ec_device_probe(struct platform_device *pdev)
> "failed to add cros-ec platform devices: %d\n",
> retval);
>
> - if (cros_ec_debugfs_init(ec))
> - dev_warn(dev, "failed to create debugfs directory\n");
> -
> return 0;
>
> failed:
> @@ -497,62 +495,25 @@ static int ec_device_remove(struct platform_device *pdev)
> {
> struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
>
> - cros_ec_debugfs_remove(ec);
> -
> mfd_remove_devices(ec->dev);
> cdev_del(&ec->cdev);
> device_unregister(&ec->class_dev);
> return 0;
> }
>
> -static void ec_device_shutdown(struct platform_device *pdev)
> -{
> - struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
> -
> - /* Be sure to clear up debugfs delayed works */
> - cros_ec_debugfs_remove(ec);
> -}
> -
> static const struct platform_device_id cros_ec_id[] = {
> { DRV_NAME, 0 },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(platform, cros_ec_id);
>
> -static __maybe_unused int ec_device_suspend(struct device *dev)
> -{
> - struct cros_ec_dev *ec = dev_get_drvdata(dev);
> -
> - cros_ec_debugfs_suspend(ec);
> -
> - return 0;
> -}
> -
> -static __maybe_unused int ec_device_resume(struct device *dev)
> -{
> - struct cros_ec_dev *ec = dev_get_drvdata(dev);
> -
> - cros_ec_debugfs_resume(ec);
> -
> - return 0;
> -}
> -
> -static const struct dev_pm_ops cros_ec_dev_pm_ops = {
> -#ifdef CONFIG_PM_SLEEP
> - .suspend = ec_device_suspend,
> - .resume = ec_device_resume,
> -#endif
> -};
> -
> static struct platform_driver cros_ec_dev_driver = {
> .driver = {
> .name = DRV_NAME,
> - .pm = &cros_ec_dev_pm_ops,
> },
> .id_table = cros_ec_id,
> .probe = ec_device_probe,
> .remove = ec_device_remove,
> - .shutdown = ec_device_shutdown,
> };
>
> static int __init cros_ec_dev_init(void)
> diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
> index 29bd9837d520..4e4232b47764 100644
> --- a/drivers/platform/chrome/Kconfig
> +++ b/drivers/platform/chrome/Kconfig
> @@ -131,4 +131,15 @@ config CROS_EC_VBC
> To compile this driver as a module, choose M here: the
> module will be called cros_ec_vbc.
>
> +config CROS_EC_DEBUGFS
> + tristate "Export ChromeOS EC internals in DebugFS"
> + depends on MFD_CROS_EC_CHARDEV && DEBUG_FS
> + default MFD_CROS_EC_CHARDEV
> + help
> + This option exposes the ChromeOS EC device internals to
> + userspace.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called cros_ec_debugfs.
> +
> endif # CHROMEOS_PLATFORMS
> diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
> index 4081b7179df7..12a5c4d18c17 100644
> --- a/drivers/platform/chrome/Makefile
> +++ b/drivers/platform/chrome/Makefile
> @@ -3,8 +3,7 @@
> obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
> obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
> obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
> -cros_ec_ctl-objs := cros_ec_sysfs.o \
> - cros_ec_debugfs.o
> +cros_ec_ctl-objs := cros_ec_sysfs.o
> obj-$(CONFIG_CROS_EC_CTL) += cros_ec_ctl.o
> obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
> obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
> @@ -15,3 +14,4 @@ obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o
> obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o
> obj-$(CONFIG_CROS_EC_LIGHTBAR) += cros_ec_lightbar.o
> obj-$(CONFIG_CROS_EC_VBC) += cros_ec_vbc.o
> +obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o
> diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
> index c62ee8e610a0..6cacac53dfce 100644
> --- a/drivers/platform/chrome/cros_ec_debugfs.c
> +++ b/drivers/platform/chrome/cros_ec_debugfs.c
> @@ -23,12 +23,16 @@
> #include <linux/fs.h>
> #include <linux/mfd/cros_ec.h>
> #include <linux/mfd/cros_ec_commands.h>
> +#include <linux/module.h>
> #include <linux/mutex.h>
> +#include <linux/platform_device.h>
> #include <linux/poll.h>
> #include <linux/sched.h>
> #include <linux/slab.h>
> #include <linux/wait.h>
>
> +#define DRV_NAME "cros-ec-debugfs"
> +
> #define LOG_SHIFT 14
> #define LOG_SIZE (1 << LOG_SHIFT)
> #define LOG_POLL_SEC 10
> @@ -423,8 +427,9 @@ static int cros_ec_create_pdinfo(struct cros_ec_debugfs *debug_info)
> return 0;
> }
>
> -int cros_ec_debugfs_init(struct cros_ec_dev *ec)
> +static int cros_ec_debugfs_probe(struct platform_device *pd)
> {
> + struct cros_ec_dev *ec = dev_get_drvdata(pd->dev.parent);
> struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);
> const char *name = ec_platform->ec_name;
> struct cros_ec_debugfs *debug_info;
> @@ -453,40 +458,57 @@ int cros_ec_debugfs_init(struct cros_ec_dev *ec)
>
> ec->debug_info = debug_info;
>
> + dev_set_drvdata(&pd->dev, ec);
> +
> return 0;
>
> remove_debugfs:
> debugfs_remove_recursive(debug_info->dir);
> return ret;
> }
> -EXPORT_SYMBOL(cros_ec_debugfs_init);
>
> -void cros_ec_debugfs_remove(struct cros_ec_dev *ec)
> +static int cros_ec_debugfs_remove(struct platform_device *pd)
> {
> - if (!ec->debug_info)
> - return;
> + struct cros_ec_dev *ec = dev_get_drvdata(pd->dev.parent);
>
> debugfs_remove_recursive(ec->debug_info->dir);
> cros_ec_cleanup_console_log(ec->debug_info);
> +
> + return 0;
> }
> -EXPORT_SYMBOL(cros_ec_debugfs_remove);
>
> -void cros_ec_debugfs_suspend(struct cros_ec_dev *ec)
> +static int __maybe_unused cros_ec_debugfs_suspend(struct device *dev)
> {
> - /*
> - * cros_ec_debugfs_init() failures are non-fatal; it's also possible
> - * that we initted things but decided that console log wasn't supported.
> - * We'll use the same set of checks that cros_ec_debugfs_remove() +
> - * cros_ec_cleanup_console_log() end up using to handle those cases.
> - */
> - if (ec->debug_info && ec->debug_info->log_buffer.buf)
> - cancel_delayed_work_sync(&ec->debug_info->log_poll_work);
> + struct cros_ec_dev *ec = dev_get_drvdata(dev);
> +
> + cancel_delayed_work_sync(&ec->debug_info->log_poll_work);
> +
> + return 0;
> }
> -EXPORT_SYMBOL(cros_ec_debugfs_suspend);
>
> -void cros_ec_debugfs_resume(struct cros_ec_dev *ec)
> +static int __maybe_unused cros_ec_debugfs_resume(struct device *dev)
> {
> - if (ec->debug_info && ec->debug_info->log_buffer.buf)
> - schedule_delayed_work(&ec->debug_info->log_poll_work, 0);
> + struct cros_ec_dev *ec = dev_get_drvdata(dev);
> +
> + schedule_delayed_work(&ec->debug_info->log_poll_work, 0);
> +
> + return 0;
> }
> -EXPORT_SYMBOL(cros_ec_debugfs_resume);
> +
> +static SIMPLE_DEV_PM_OPS(cros_ec_debugfs_pm_ops,
> + cros_ec_debugfs_suspend, cros_ec_debugfs_resume);
> +
> +static struct platform_driver cros_ec_debugfs_driver = {
> + .driver = {
> + .name = DRV_NAME,
> + .pm = &cros_ec_debugfs_pm_ops,
> + },
> + .probe = cros_ec_debugfs_probe,
> + .remove = cros_ec_debugfs_remove,
> +};
> +
> +module_platform_driver(cros_ec_debugfs_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("Debug logs for ChromeOS EC");
> +MODULE_ALIAS("platform:" DRV_NAME);
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index bbbe416fd573..3e4401e2ceea 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -326,10 +326,4 @@ u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev);
> /* sysfs stuff */
> extern struct attribute_group cros_ec_attr_group;
>
> -/* debugfs stuff */
> -int cros_ec_debugfs_init(struct cros_ec_dev *ec);
> -void cros_ec_debugfs_remove(struct cros_ec_dev *ec);
> -void cros_ec_debugfs_suspend(struct cros_ec_dev *ec);
> -void cros_ec_debugfs_resume(struct cros_ec_dev *ec);
> -
> #endif /* __LINUX_MFD_CROS_EC_H */
> --
> 2.19.1
>

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