[PATCH] power: qcom_smbb: Make an extcon for usb cable detection

From: Stephen Boyd
Date: Sun Jun 26 2016 - 01:54:45 EST


On these PMICs the usb cable connection/disconnection is
indicated by the usb-valid interrupt being high or low
respectively. Let's make an extcon for that, so we can notify usb
drivers of the cable state.

Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Signed-off-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
---
drivers/power/qcom_smbb.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/power/qcom_smbb.c b/drivers/power/qcom_smbb.c
index 5eb1e9e543e2..b5896ba2a602 100644
--- a/drivers/power/qcom_smbb.c
+++ b/drivers/power/qcom_smbb.c
@@ -34,6 +34,7 @@
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/extcon.h>

#define SMBB_CHG_VMAX 0x040
#define SMBB_CHG_VSAFE 0x041
@@ -111,6 +112,7 @@ struct smbb_charger {
unsigned int revision;
unsigned int addr;
struct device *dev;
+ struct extcon_dev *edev;

bool dc_disabled;
bool jeita_ext_temp;
@@ -125,6 +127,11 @@ struct smbb_charger {
struct regmap *regmap;
};

+static const unsigned int smbb_usb_extcon_cable[] = {
+ EXTCON_USB,
+ EXTCON_NONE,
+};
+
static int smbb_vbat_weak_fn(unsigned int index)
{
return 2100000 + index * 100000;
@@ -371,6 +378,8 @@ static irqreturn_t smbb_usb_valid_handler(int irq, void *_data)
struct smbb_charger *chg = _data;

smbb_set_line_flag(chg, irq, STATUS_USBIN_VALID);
+ extcon_set_cable_state_(chg->edev, EXTCON_USB,
+ chg->status & STATUS_USBIN_VALID);
power_supply_changed(chg->usb_psy);

return IRQ_HANDLED;
@@ -849,6 +858,18 @@ static int smbb_charger_probe(struct platform_device *pdev)
return PTR_ERR(chg->usb_psy);
}

+ chg->edev = devm_extcon_dev_allocate(&pdev->dev, smbb_usb_extcon_cable);
+ if (IS_ERR(chg->edev)) {
+ dev_err(&pdev->dev, "failed to allocate extcon device\n");
+ return -ENOMEM;
+ }
+
+ rc = devm_extcon_dev_register(&pdev->dev, chg->edev);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "failed to register extcon device\n");
+ return rc;
+ }
+
if (!chg->dc_disabled) {
dc_cfg.drv_data = chg;
dc_cfg.supplied_to = smbb_bif;
--
2.9.0.rc2.8.ga28705d