diff options
Diffstat (limited to 'drivers/power/reset')
| -rw-r--r-- | drivers/power/reset/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/power/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/reset/as3722-poweroff.c | 96 |
3 files changed, 103 insertions, 0 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 9b3ea535b472..6d452a78b19c 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -6,6 +6,12 @@ menuconfig POWER_RESET Say Y here to enable board reset and power off +config POWER_RESET_AS3722 + bool "ams AS3722 power-off driver" + depends on MFD_AS3722 && POWER_RESET + help + This driver supports turning off board via a ams AS3722 power-off. + config POWER_RESET_GPIO bool "GPIO power-off driver" depends on OF_GPIO && POWER_RESET diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 3e6ed88725ac..a5b4a77d1a41 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,3 +1,4 @@ +obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o diff --git a/drivers/power/reset/as3722-poweroff.c b/drivers/power/reset/as3722-poweroff.c new file mode 100644 index 000000000000..684971199bd3 --- /dev/null +++ b/drivers/power/reset/as3722-poweroff.c @@ -0,0 +1,96 @@ +/* + * Power off driver for ams AS3722 device. + * + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/mfd/as3722.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct as3722_poweroff { + struct device *dev; + struct as3722 *as3722; +}; + +static struct as3722_poweroff *as3722_pm_poweroff; + +static void as3722_pm_power_off(void) +{ + int ret; + + if (!as3722_pm_poweroff) { + pr_err("AS3722 poweroff is not initialised\n"); + return; + } + + ret = as3722_update_bits(as3722_pm_poweroff->as3722, + AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF); + if (ret < 0) + dev_err(as3722_pm_poweroff->dev, + "RESET_CONTROL_REG update failed, %d\n", ret); +} + +static int as3722_poweroff_probe(struct platform_device *pdev) +{ + struct as3722_poweroff *as3722_poweroff; + struct device_node *np = pdev->dev.parent->of_node; + + if (!np) + return -EINVAL; + + if (!of_property_read_bool(np, "ams,system-power-controller")) + return 0; + + as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff), + GFP_KERNEL); + if (!as3722_poweroff) + return -ENOMEM; + + as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent); + as3722_poweroff->dev = &pdev->dev; + as3722_pm_poweroff = as3722_poweroff; + if (!pm_power_off) + pm_power_off = as3722_pm_power_off; + + return 0; +} + +static int as3722_poweroff_remove(struct platform_device *pdev) +{ + if (pm_power_off == as3722_pm_power_off) + pm_power_off = NULL; + as3722_pm_poweroff = NULL; + + return 0; +} + +static struct platform_driver as3722_poweroff_driver = { + .driver = { + .name = "as3722-power-off", + .owner = THIS_MODULE, + }, + .probe = as3722_poweroff_probe, + .remove = as3722_poweroff_remove, +}; + +module_platform_driver(as3722_poweroff_driver); + +MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device"); +MODULE_ALIAS("platform:as3722-power-off"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); |