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regulator: qpnp-oledb: Add sysfs class to enable/disable secure mode

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Secure mode need to be disabled and enabled during the entry and
exit of the secure display use case respectively. Add sysfs
property to allow userspace to perform this operation.

To enter the secure mode:
	echo 1 > /sys/class/lcd_bias/secure_mode

To exit the secure mode:
	echo 0 > /sys/class/lcd_bias/secure_mode

Change-Id: If1e5d85961df4b25a4596c2b291c990f3e7c3a9c
Signed-off-by: Kavya Nunna <knunna@codeaurora.org>
This commit is contained in:
Kavya Nunna 2018-10-16 10:34:44 +05:30
commit 8d936a5ba0
1 changed files with 27 additions and 2 deletions
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29
drivers/regulator/qpnp-oledb-regulator.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -155,6 +155,7 @@ struct qpnp_oledb {
struct platform_device *pdev;
struct device *dev;
struct regmap *regmap;
struct class oledb_class;
struct regulator_desc rdesc;
struct regulator_dev *rdev;
struct qpnp_oledb_psm_ctl psm_ctl;
@ -185,6 +186,7 @@ struct qpnp_oledb {
bool force_pd_control;
bool handle_lab_sc_notification;
bool lab_sc_detected;
bool secure_mode;
};
static const u16 oledb_warmup_dly_ns[] = {6700, 13300, 26700, 53400};
@ -279,6 +281,9 @@ static int qpnp_oledb_regulator_enable(struct regulator_dev *rdev)
struct qpnp_oledb *oledb = rdev_get_drvdata(rdev);
if (oledb->secure_mode)
return 0;
if (oledb->lab_sc_detected == true) {
pr_info("Short circuit detected: Disabled OLEDB rail\n");
return 0;
@ -342,6 +347,8 @@ static int qpnp_oledb_regulator_disable(struct regulator_dev *rdev)
struct qpnp_oledb *oledb = rdev_get_drvdata(rdev);
if (oledb->secure_mode)
return 0;
/*
* Disable ext-pin-ctl after display-supply is turned off. This is to
* avoid glitches on the external pin.
@ -416,7 +423,7 @@ static int qpnp_oledb_regulator_set_voltage(struct regulator_dev *rdev,
struct qpnp_oledb *oledb = rdev_get_drvdata(rdev);
if (oledb->swire_control)
if (oledb->swire_control || oledb->secure_mode)
return 0;
val = DIV_ROUND_UP(min_uV - OLEDB_VOUT_MIN_MV, OLEDB_VOUT_STEP_MV);
@ -1260,6 +1267,9 @@ static int qpnp_labibb_notifier_cb(struct notifier_block *nb,
struct qpnp_oledb *oledb = container_of(nb, struct qpnp_oledb,
oledb_nb);
if (oledb->secure_mode)
return 0;
if (action == LAB_VREG_NOT_OK) {
/* short circuit detected. Disable OLEDB module */
val = 0;
@ -1286,6 +1296,10 @@ static int qpnp_labibb_notifier_cb(struct notifier_block *nb,
return NOTIFY_OK;
}
static struct class_attribute oledb_attributes[] = {
[0] = __ATTR(secure_mode, 0664, NULL, NULL),
__ATTR_NULL,
};
static int qpnp_oledb_regulator_probe(struct platform_device *pdev)
{
int rc = 0;
@ -1345,6 +1359,17 @@ static int qpnp_oledb_regulator_probe(struct platform_device *pdev)
pr_err("Failed to register regulator rc=%d\n", rc);
goto out;
}
oledb->oledb_class.name = "amoled_bias";
oledb->oledb_class.owner = THIS_MODULE;
oledb->oledb_class.class_attrs = oledb_attributes;
rc = class_register(&oledb->oledb_class);
if (rc < 0) {
pr_err("Failed to register oledb class rc = %d\n", rc);
return rc;
}
pr_info("OLEDB registered successfully, ext_pin_en=%d mod_en=%d current_voltage=%d mV\n",
oledb->ext_pin_control, oledb->mod_enable,
oledb->current_voltage);