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intel_mid_powerbtn.c
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intel_mid_powerbtn.c
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/* * Power button driver for Medfield. * * Copyright (C) 2010 Intel Corp * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that 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. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/input.h> #include <linux/mfd/intel_msic.h> #define DRIVER_NAME "msic_power_btn" #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */ /* * MSIC document ti_datasheet defines the 1st bit reg 0x21 is used to mask * power button interrupt */ #define MSIC_PWRBTNM (1 << 0) static irqreturn_t mfld_pb_isr(int irq, void *dev_id) { struct input_dev *input = dev_id; int ret; u8 pbstat; ret = intel_msic_reg_read(INTEL_MSIC_PBSTATUS, &pbstat); dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat); if (ret < 0) { dev_err(input->dev.parent, "Read error %d while reading" " MSIC_PB_STATUS\n", ret); } else { input_event(input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL)); input_sync(input); } return IRQ_HANDLED; } static int mfld_pb_probe(struct platform_device *pdev) { struct input_dev *input; int irq = platform_get_irq(pdev, 0); int error; if (irq < 0) return -EINVAL; input = input_allocate_device(); if (!input) { dev_err(&pdev->dev, "Input device allocation error\n"); return -ENOMEM; } input->name = pdev->name; input->phys = "power-button/input0"; input->id.bustype = BUS_HOST; input->dev.parent = &pdev->dev; input_set_capability(input, EV_KEY, KEY_POWER); error = request_threaded_irq(irq, NULL, mfld_pb_isr, IRQF_NO_SUSPEND, DRIVER_NAME, input); if (error) { dev_err(&pdev->dev, "Unable to request irq %d for mfld power" "button\n", irq); goto err_free_input; } error = input_register_device(input); if (error) { dev_err(&pdev->dev, "Unable to register input dev, error " "%d\n", error); goto err_free_irq; } platform_set_drvdata(pdev, input); /* * SCU firmware might send power button interrupts to IA core before * kernel boots and doesn't get EOI from IA core. The first bit of * MSIC reg 0x21 is kept masked, and SCU firmware doesn't send new * power interrupt to Android kernel. Unmask the bit when probing * power button in kernel. * There is a very narrow race between irq handler and power button * initialization. The race happens rarely. So we needn't worry * about it. */ error = intel_msic_reg_update(INTEL_MSIC_IRQLVL1MSK, 0, MSIC_PWRBTNM); if (error) { dev_err(&pdev->dev, "Unable to clear power button interrupt, " "error: %d\n", error); goto err_free_irq; } return 0; err_free_irq: free_irq(irq, input); err_free_input: input_free_device(input); return error; } static int mfld_pb_remove(struct platform_device *pdev) { struct input_dev *input = platform_get_drvdata(pdev); int irq = platform_get_irq(pdev, 0); free_irq(irq, input); input_unregister_device(input); return 0; } static struct platform_driver mfld_pb_driver = { .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, }, .probe = mfld_pb_probe, .remove = mfld_pb_remove, }; module_platform_driver(mfld_pb_driver); MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>"); MODULE_DESCRIPTION("Intel Medfield Power Button Driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:" DRIVER_NAME);
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