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379749c463
The kernel allows us to specify a function call-back which will be invoked when a system power-off request has been received. Here we provide one which is to be used when shutting down AB8500 based platforms. Signed-off-by: Lee Jones <lee.jones@linaro.org>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/signal.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/abx500/ab8500.h>
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#include <linux/mfd/abx500/ab8500-sysctrl.h>
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static struct device *sysctrl_dev;
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void ab8500_power_off(void)
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{
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sigset_t old;
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sigset_t all;
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sigfillset(&all);
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if (!sigprocmask(SIG_BLOCK, &all, &old)) {
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(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
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AB8500_STW4500CTRL1_SWOFF |
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AB8500_STW4500CTRL1_SWRESET4500N);
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(void)sigprocmask(SIG_SETMASK, &old, NULL);
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}
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}
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static inline bool valid_bank(u8 bank)
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{
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return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
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(bank == AB8500_SYS_CTRL2_BLOCK));
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}
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int ab8500_sysctrl_read(u16 reg, u8 *value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EAGAIN;
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bank = (reg >> 8);
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if (!valid_bank(bank))
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return -EINVAL;
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return abx500_get_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), value);
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}
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int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EAGAIN;
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bank = (reg >> 8);
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if (!valid_bank(bank))
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return -EINVAL;
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return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), mask, value);
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}
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static int ab8500_sysctrl_probe(struct platform_device *pdev)
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{
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struct ab8500_platform_data *plat;
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sysctrl_dev = &pdev->dev;
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plat = dev_get_platdata(pdev->dev.parent);
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if (plat->pm_power_off)
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pm_power_off = ab8500_power_off;
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return 0;
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}
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static int ab8500_sysctrl_remove(struct platform_device *pdev)
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{
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sysctrl_dev = NULL;
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return 0;
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}
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static struct platform_driver ab8500_sysctrl_driver = {
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.driver = {
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.name = "ab8500-sysctrl",
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.owner = THIS_MODULE,
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},
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.probe = ab8500_sysctrl_probe,
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.remove = ab8500_sysctrl_remove,
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};
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static int __init ab8500_sysctrl_init(void)
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{
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return platform_driver_register(&ab8500_sysctrl_driver);
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}
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subsys_initcall(ab8500_sysctrl_init);
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MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
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MODULE_DESCRIPTION("AB8500 system control driver");
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MODULE_LICENSE("GPL v2");
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