7714567c87
In the 2.6.36 kernel we did not have the MSIC driver. Changed all ipc_scu_reads/writes to use the MSIC driver and defines. Added a fix from the 2.6.36 kernel where the SCU FW could send a power button interrupt to the IA32 FW and the kernel was not running yet. This resulted in the interrupt not getting cleared and the power button was ignored. this fix just clears the interrupt on start-up. Signed-off-by: Michael Demeter <michael.demeter@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Revert style-only changes. Remove unused variable. Fix comment style.] Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>
151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/*
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* Power button driver for Medfield.
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*
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* Copyright (C) 2010 Intel Corp
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/mfd/intel_msic.h>
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#define DRIVER_NAME "msic_power_btn"
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#define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
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/*
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* MSIC document ti_datasheet defines the 1st bit reg 0x21 is used to mask
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* power button interrupt
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*/
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#define MSIC_PWRBTNM (1 << 0)
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static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
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{
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struct input_dev *input = dev_id;
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int ret;
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u8 pbstat;
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ret = intel_msic_reg_read(INTEL_MSIC_PBSTATUS, &pbstat);
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dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat);
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if (ret < 0) {
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dev_err(input->dev.parent, "Read error %d while reading"
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" MSIC_PB_STATUS\n", ret);
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} else {
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input_event(input, EV_KEY, KEY_POWER,
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!(pbstat & MSIC_PB_LEVEL));
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input_sync(input);
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}
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return IRQ_HANDLED;
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}
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static int __devinit mfld_pb_probe(struct platform_device *pdev)
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{
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struct input_dev *input;
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int irq = platform_get_irq(pdev, 0);
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int error;
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if (irq < 0)
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return -EINVAL;
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input = input_allocate_device();
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if (!input) {
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dev_err(&pdev->dev, "Input device allocation error\n");
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return -ENOMEM;
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}
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input->name = pdev->name;
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input->phys = "power-button/input0";
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input->id.bustype = BUS_HOST;
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input->dev.parent = &pdev->dev;
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input_set_capability(input, EV_KEY, KEY_POWER);
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error = request_threaded_irq(irq, NULL, mfld_pb_isr, 0,
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DRIVER_NAME, input);
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if (error) {
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dev_err(&pdev->dev, "Unable to request irq %d for mfld power"
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"button\n", irq);
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goto err_free_input;
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}
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error = input_register_device(input);
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if (error) {
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dev_err(&pdev->dev, "Unable to register input dev, error "
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"%d\n", error);
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goto err_free_irq;
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}
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platform_set_drvdata(pdev, input);
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/*
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* SCU firmware might send power button interrupts to IA core before
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* kernel boots and doesn't get EOI from IA core. The first bit of
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* MSIC reg 0x21 is kept masked, and SCU firmware doesn't send new
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* power interrupt to Android kernel. Unmask the bit when probing
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* power button in kernel.
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* There is a very narrow race between irq handler and power button
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* initialization. The race happens rarely. So we needn't worry
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* about it.
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*/
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error = intel_msic_reg_update(INTEL_MSIC_IRQLVL1MSK, 0, MSIC_PWRBTNM);
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if (error) {
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dev_err(&pdev->dev, "Unable to clear power button interrupt, "
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"error: %d\n", error);
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goto err_free_irq;
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}
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return 0;
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err_free_irq:
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free_irq(irq, input);
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err_free_input:
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input_free_device(input);
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return error;
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}
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static int __devexit mfld_pb_remove(struct platform_device *pdev)
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{
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struct input_dev *input = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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free_irq(irq, input);
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input_unregister_device(input);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver mfld_pb_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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.probe = mfld_pb_probe,
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.remove = __devexit_p(mfld_pb_remove),
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};
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module_platform_driver(mfld_pb_driver);
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MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
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MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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