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Commit dfc409f9 authored by Kavya Nunna's avatar Kavya Nunna
Browse files

power: smb1351-charger: Add support for OTG IRQ 



SMB1351 does not have a USB_ID detection logic. Add support
for handling the ID detection over a dedicated GPIO.

Change-Id: Iadaf9344ab00bec1b173516a5004187e98e89302
Signed-off-by: default avatarKavya Nunna <knunna@codeaurora.org>
parent ad470245

drivers/power/supply/qcom/smb1351-charger.c

+69 −0
Original line number Diff line number Diff line
@@ -11,12 +11,15 @@ 
#include <linux/extcon-provider.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/gpio.h>

#include <linux/slab.h>

#include <linux/power_supply.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/of_regulator.h>

#include <linux/regulator/machine.h>

#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/of_irq.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/pinctrl/consumer.h>
@@ -493,6 +496,8 @@ struct smb1351_charger { 
	struct regulator	*dpdm_reg;

	enum power_supply_type	charger_type;

	bool			otg_enable;

	int			usb_id_gpio;

	int			usb_id_irq;

};



struct smb_irq_info {
@@ -2087,6 +2092,27 @@ static irqreturn_t smb1351_chg_stat_handler(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



irqreturn_t smb1351_usb_id_irq_handler(int irq, void *data)

{

	struct smb1351_charger *chip = data;

	bool id_state;

	int rc = 0;



	id_state = gpio_get_value(chip->usb_id_gpio);

	pr_debug("id_state=%d\n", id_state);



	rc = smb1351_masked_write(chip, CMD_CHG_REG, CMD_OTG_EN_BIT,

				id_state ? 0 : CMD_OTG_EN_BIT);

	if (rc < 0)

		pr_err("Failed to %s OTG\n", id_state ? "disable" : "enable");

	else

		pr_debug("SMB1351 OTG %s\n",  id_state ? "disabled" : "enabled");



	extcon_set_state_sync(chip->extcon, EXTCON_USB_HOST, !id_state);



	return IRQ_HANDLED;

}



#define LAST_CNFG_REG	0x16

static int show_cnfg_regs(struct seq_file *m, void *data)

{
@@ -2425,6 +2451,9 @@ static int smb1351_determine_initial_state(struct smb1351_charger *chip) 
		smb1351_apsd_complete_handler(chip, 1);

	}



	if (chip->usb_id_gpio > 0)

		smb1351_usb_id_irq_handler(0, chip);



	return 0;



fail_init_status:
@@ -2486,6 +2515,24 @@ static int create_debugfs_entries(struct smb1351_charger *chip) 
	return 0;

}



static int smb1351_init_otg(struct smb1351_charger *chip)

{

	chip->usb_id_gpio = chip->usb_id_irq = -EINVAL;



	if (of_find_property(chip->dev->of_node, "qcom,usb-id-gpio", NULL))

		chip->usb_id_gpio = of_get_named_gpio(chip->dev->of_node,

				"qcom,usb-id-gpio", 0);



	chip->usb_id_irq = of_irq_get_byname(chip->dev->of_node,

			"smb1351_usb_id_irq");



	if (chip->usb_id_irq < 0 || chip->usb_id_gpio < 0)

		pr_err("OTG irq (%d) / gpio (%d) not defined\n",

			chip->usb_id_irq, chip->usb_id_gpio);



	return 0;

}



static int smb1351_main_charger_probe(struct i2c_client *client,

				const struct i2c_device_id *id)

{
@@ -2607,6 +2654,12 @@ static int smb1351_main_charger_probe(struct i2c_client *client, 
		goto fail_smb1351_hw_init;

	}



	rc = smb1351_init_otg(chip);

	if (rc < 0) {

		dev_err(chip->dev, "Couldn't init otg rc=%d\n", rc);

		return rc;

	}



	rc = smb1351_determine_initial_state(chip);

	if (rc) {

		pr_err("Couldn't determine initial state rc=%d\n", rc);
@@ -2627,6 +2680,22 @@ static int smb1351_main_charger_probe(struct i2c_client *client, 
		enable_irq_wake(client->irq);

	}



	if (chip->usb_id_irq > 0 && chip->usb_id_gpio > 0) {

		rc = devm_request_threaded_irq(chip->dev,

			chip->usb_id_irq, NULL,

			smb1351_usb_id_irq_handler,

			IRQF_ONESHOT

			| IRQF_TRIGGER_FALLING

			| IRQF_TRIGGER_RISING,

			"smb1351_usb_id_irq", chip);



		if (rc < 0) {

			pr_err("Failed to register id-irq rc=%d\n", rc);

			return rc;

		}

		enable_irq_wake(chip->usb_id_irq);

	}



	create_debugfs_entries(chip);



	dump_regs(chip);