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Date: Thu, 27 Sep 2012 00:15:42 -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 20/57] power: Adds support for legacy USB chargers
On Tue, Sep 25, 2012 at 10:12:17AM -0600, mathieu.poirier@...aro.org wrote:
> From: Marcus Cooper <marcus.xm.cooper@...ricsson.com>
>
> A Legacy USB charger should be handled directly by the charger
> driver.
>
> Signed-off-by: Marcus Cooper <marcus.xm.cooper@...ricsson.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Karl KOMIEROWSKI <karl.komierowski@...ricsson.com>
> Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
> ---
> drivers/power/ab8500_charger.c | 66 ++++++++++++++++++++++++++++++++++-----
> 1 files changed, 57 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
> index 4155feb..7cd4165 100644
> --- a/drivers/power/ab8500_charger.c
> +++ b/drivers/power/ab8500_charger.c
> @@ -85,6 +85,9 @@
> /* Step up/down delay in us */
> #define STEP_UDELAY 1000
>
> +/* Wait for enumeration before charging in ms */
> +#define WAIT_FOR_USB_ENUMERATION (5 * 1000)
> +
> #define CHARGER_STATUS_POLL 10 /* in ms */
>
> /* UsbLineStatus register - usb types */
> @@ -198,6 +201,7 @@ struct ab8500_charger_usb_state {
> * charger is enabled
> * @vbat Battery voltage
> * @old_vbat Previously measured battery voltage
> + * @usb_device_is_unrecognised USB device is unrecognised by the hardware
> * @autopower Indicate if we should have automatic pwron after pwrloss
> * @parent: Pointer to the struct ab8500
> * @gpadc: Pointer to the struct gpadc
> @@ -216,6 +220,7 @@ struct ab8500_charger_usb_state {
> * @check_usbchgnotok_work: Work for checking USB charger not ok status
> * @kick_wd_work: Work for kicking the charger watchdog in case
> * of ABB rev 1.* due to the watchog logic bug
> + * @attach_work: Work for checking the usb enumeration
> * @ac_charger_attached_work: Work for checking if AC charger is still
> * connected
> * @usb_charger_attached_work: Work for checking if USB charger is still
> @@ -239,6 +244,7 @@ struct ab8500_charger {
> bool vddadc_en_usb;
> int vbat;
> int old_vbat;
> + bool usb_device_is_unrecognised;
> bool autopower;
> struct ab8500 *parent;
> struct ab8500_gpadc *gpadc;
> @@ -256,6 +262,7 @@ struct ab8500_charger {
> struct delayed_work check_hw_failure_work;
> struct delayed_work check_usbchgnotok_work;
> struct delayed_work kick_wd_work;
> + struct delayed_work attach_work;
> struct delayed_work ac_charger_attached_work;
> struct delayed_work usb_charger_attached_work;
Quite a lot of these. I doubt that the driver really needs all this stuff
executed in parallel. I guess something is wrong with the driver design.
Maybe there should be just one delayed work: you can probably queue it
early from the irq handler, and do all the work there...
> struct work_struct ac_work;
> @@ -588,6 +595,8 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> {
> int ret = 0;
>
> + di->usb_device_is_unrecognised = false;
> +
> switch (link_status) {
> case USB_STAT_STD_HOST_NC:
> case USB_STAT_STD_HOST_C_NS:
> @@ -633,9 +642,15 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
> di->max_usb_in_curr);
> break;
> + case USB_STAT_NOT_CONFIGURED:
> + if (di->vbus_detected) {
> + di->usb_device_is_unrecognised = true;
> + dev_dbg(di->dev, "USB Type - Legacy charger.\n");
> + di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
> + break;
> + }
> case USB_STAT_HM_IDGND:
> case USB_STAT_NOT_VALID_LINK:
> - case USB_STAT_NOT_CONFIGURED:
> dev_err(di->dev, "USB Type - Charging not allowed\n");
> di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
> ret = -ENXIO;
> @@ -1899,6 +1914,30 @@ static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
> }
>
> /**
> + * ab8500_charger_usb_link_attach_work() - delayd work to detect USB type
> + * @work: pointer to the work_struct structure
> + *
> + * Detect the type of USB plugged
> + */
> +static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
> +{
> + int ret;
> +
This empty line is not needed.
> + struct ab8500_charger *di = container_of(work,
> + struct ab8500_charger, attach_work.work);
> +
> + /* Update maximum input current if USB enumeration is not detected */
> + if (!di->usb.charger_online) {
> + ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
> + if (ret)
> + return;
> + }
> +
> + ab8500_charger_set_usb_connected(di, true);
> + ab8500_power_supply_changed(di, &di->usb_chg.psy);
> +}
> +
> +/**
> * ab8500_charger_usb_link_status_work() - work to detect USB type
> * @work: pointer to the work_struct structure
> *
> @@ -1928,14 +1967,20 @@ static void ab8500_charger_usb_link_status_work(struct work_struct *work)
> di->vbus_detected = 1;
> ret = ab8500_charger_read_usb_type(di);
> if (!ret) {
> - /* Update maximum input current */
> - ret = ab8500_charger_set_vbus_in_curr(di,
> - di->max_usb_in_curr);
> - if (ret)
> - return;
> -
> - ab8500_charger_set_usb_connected(di, true);
> - ab8500_power_supply_changed(di, &di->usb_chg.psy);
> + if (di->usb_device_is_unrecognised) {
> + dev_dbg(di->dev,
> + "Potential Legacy Charger device. "
> + "Delay work for %d msec for USB enum "
> + "to finish",
> + WAIT_FOR_USB_ENUMERATION);
> + queue_delayed_work(di->charger_wq,
> + &di->attach_work,
> + msecs_to_jiffies
> + (WAIT_FOR_USB_ENUMERATION));
Very weird way to wrap lines. I'd prefer "(" to stay on the previous line.
I also think that it's possible to refactor this function to make it less
indented.
> + } else {
> + queue_delayed_work(di->charger_wq,
> + &di->attach_work, 0);
> + }
> } else if (ret == -ENXIO) {
> /* No valid charger type detected */
> ab8500_charger_set_usb_connected(di, false);
> @@ -2886,6 +2931,9 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
> INIT_DELAYED_WORK_DEFERRABLE(&di->kick_wd_work,
> ab8500_charger_kick_watchdog_work);
>
> + INIT_DELAYED_WORK(&di->attach_work,
> + ab8500_charger_usb_link_attach_work);
--
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