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Subject[PATCH 5/5] extcon: intel-cht-wc: Add support for monitoring external USB Type-C controller
Date
On some boards the Whiskey Cove PMIC is combined with an external USB
Type-C controller, in this case extcon consumers should use the Type-C
extcon state, except when the USB Type-C controller detects a current
limit of 500 mA which may indicate USB-C to USB-A cable at which point
the extcon consumer should use the Whiskey Cove's BC-1.2 detection's
state.

Since the Type-C controller info is incomplete and needs to be
supplemented with the BC1.2 detection result in some cases, this
commit makes the intel-cht-wc extcon driver monitor the extcon device
registered by the Type-C controller and report that as our extcon state
except when BC-1.2 detection should be used. This allows extcon
consumers on these boards to keep monitoring only the intel-cht-wc extcon
and then get complete extcon info from that, which combines the Type-C
and BC-1.2 info.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/extcon/extcon-intel-cht-wc.c | 96 ++++++++++++++++++++++++++++++------
1 file changed, 80 insertions(+), 16 deletions(-)

diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index 684f6b2..e510188 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -15,6 +15,7 @@
* more details.
*/

+#include <linux/acpi.h>
#include <linux/extcon.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
@@ -88,6 +89,7 @@ static const unsigned int cht_wc_extcon_cables[] = {
EXTCON_CHG_USB_CDP,
EXTCON_CHG_USB_DCP,
EXTCON_CHG_USB_ACA,
+ EXTCON_CHG_USB_FAST,
EXTCON_NONE,
};

@@ -95,6 +97,9 @@ struct cht_wc_extcon_data {
struct device *dev;
struct regmap *regmap;
struct extcon_dev *edev;
+ struct extcon_dev *usbc;
+ struct notifier_block usbc_nb;
+ struct work_struct work;
unsigned int previous_cable;
bool usb_host;
};
@@ -224,8 +229,32 @@ static void cht_wc_extcon_set_state(struct cht_wc_extcon_data *ext,
extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host);
}

-static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
+static void cht_wc_extcon_usb_c_event(struct work_struct *work)
{
+ struct cht_wc_extcon_data *ext =
+ container_of(work, struct cht_wc_extcon_data, work);
+ unsigned int cable = EXTCON_NONE;
+
+ if (extcon_get_state(ext->usbc, EXTCON_CHG_USB_SDP) > 0) {
+ /*
+ * USB-C to USB-A cable ? Try BC1.2 charger detection from
+ * WC PMIC, ignore charger detection errors.
+ */
+ cable = cht_wc_extcon_get_charger(ext, true);
+ } else if (extcon_get_state(ext->usbc, EXTCON_CHG_USB_CDP) > 0) {
+ cable = EXTCON_CHG_USB_CDP;
+ } else if (extcon_get_state(ext->usbc, EXTCON_CHG_USB_FAST) > 0) {
+ cable = EXTCON_CHG_USB_FAST;
+ }
+
+ ext->usb_host = (extcon_get_state(ext->usbc, EXTCON_USB_HOST) > 0);
+ cht_wc_extcon_set_state(ext, cable);
+}
+
+static void cht_wc_extcon_pwrsrc_event(struct work_struct *work)
+{
+ struct cht_wc_extcon_data *ext =
+ container_of(work, struct cht_wc_extcon_data, work);
int ret, pwrsrc_sts, id;
unsigned int cable = EXTCON_NONE;
/* Ignore errors in host mode, as the 5v boost converter is on then */
@@ -258,7 +287,7 @@ static irqreturn_t cht_wc_extcon_isr(int irq, void *data)
return IRQ_NONE;
}

- cht_wc_extcon_pwrsrc_event(ext);
+ schedule_work(&ext->work);

ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ, irqs);
if (ret) {
@@ -269,6 +298,17 @@ static irqreturn_t cht_wc_extcon_isr(int irq, void *data)
return IRQ_HANDLED;
}

+static int cht_wc_extcon_usbc_evt(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct cht_wc_extcon_data *ext =
+ container_of(nb, struct cht_wc_extcon_data, usbc_nb);
+
+ schedule_work(&ext->work);
+
+ return NOTIFY_OK;
+}
+
static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable)
{
int ret, mask, val;
@@ -300,6 +340,15 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
ext->regmap = pmic->regmap;
ext->previous_cable = EXTCON_NONE;

+ if (acpi_dev_present("INT33FE", NULL, -1)) {
+ ext->usbc = extcon_get_extcon_dev("fusb302");
+ if (!ext->usbc)
+ return -EPROBE_DEFER;
+
+ dev_info(&pdev->dev,
+ "Using FUSB302 extcon for USB Type-C cable info\n");
+ }
+
/* Initialize extcon device */
ext->edev = devm_extcon_dev_allocate(ext->dev, cht_wc_extcon_cables);
if (IS_ERR(ext->edev))
@@ -335,25 +384,40 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
/* Route D+ and D- to PMIC for initial charger detection */
cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);

- /* Get initial state */
- cht_wc_extcon_pwrsrc_event(ext);
-
- ret = devm_request_threaded_irq(ext->dev, irq, NULL, cht_wc_extcon_isr,
- IRQF_ONESHOT, pdev->name, ext);
- if (ret) {
- dev_err(ext->dev, "Error requesting interrupt: %d\n", ret);
- goto disable_sw_control;
- }
+ if (ext->usbc) {
+ INIT_WORK(&ext->work, cht_wc_extcon_usb_c_event);
+ ext->usbc_nb.notifier_call = cht_wc_extcon_usbc_evt;
+ ret = devm_extcon_register_notifier_all(&pdev->dev, ext->usbc,
+ &ext->usbc_nb);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Error registering usbc extcon notifier: %d\n",
+ ret);
+ goto disable_sw_control;
+ }
+ } else {
+ INIT_WORK(&ext->work, cht_wc_extcon_pwrsrc_event);
+ ret = devm_request_threaded_irq(ext->dev, irq, NULL,
+ cht_wc_extcon_isr, IRQF_ONESHOT,
+ pdev->name, ext);
+ if (ret) {
+ dev_err(ext->dev, "Error requesting irq: %d\n", ret);
+ goto disable_sw_control;
+ }

- /* Unmask irqs */
- ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK,
+ /* Unmask irqs */
+ ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK,
(int)~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_ID_GND |
CHT_WC_PWRSRC_ID_FLOAT));
- if (ret) {
- dev_err(ext->dev, "Error writing irq-mask: %d\n", ret);
- goto disable_sw_control;
+ if (ret) {
+ dev_err(ext->dev, "Error writing irq-mask: %d\n", ret);
+ goto disable_sw_control;
+ }
}

+ /* Get initial state */
+ schedule_work(&ext->work);
+
platform_set_drvdata(pdev, ext);

return 0;
--
2.9.3
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