+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Power button driver for Intel MID platforms.
- *
- * Copyright (C) 2010,2017 Intel Corp
- *
- * Author: Hong Liu <hong.liu@intel.com>
- * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
- */
-
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/mfd/intel_msic.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/pm_wakeirq.h>
-#include <linux/slab.h>
-
-#include <asm/cpu_device_id.h>
-#include <asm/intel-family.h>
-#include <asm/intel_scu_ipc.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)
-
-/* Intel Tangier */
-#define BCOVE_PB_LEVEL (1 << 4) /* 1 - release, 0 - press */
-
-/* Basin Cove PMIC */
-#define BCOVE_PBIRQ 0x02
-#define BCOVE_IRQLVL1MSK 0x0c
-#define BCOVE_PBIRQMASK 0x0d
-#define BCOVE_PBSTATUS 0x27
-
-struct mid_pb_ddata {
- struct device *dev;
- int irq;
- struct input_dev *input;
- unsigned short mirqlvl1_addr;
- unsigned short pbstat_addr;
- u8 pbstat_mask;
- struct intel_scu_ipc_dev *scu;
- int (*setup)(struct mid_pb_ddata *ddata);
-};
-
-static int mid_pbstat(struct mid_pb_ddata *ddata, int *value)
-{
- struct input_dev *input = ddata->input;
- int ret;
- u8 pbstat;
-
- ret = intel_scu_ipc_dev_ioread8(ddata->scu, ddata->pbstat_addr,
- &pbstat);
- if (ret)
- return ret;
-
- dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat);
-
- *value = !(pbstat & ddata->pbstat_mask);
- return 0;
-}
-
-static int mid_irq_ack(struct mid_pb_ddata *ddata)
-{
- return intel_scu_ipc_dev_update(ddata->scu, ddata->mirqlvl1_addr, 0,
- MSIC_PWRBTNM);
-}
-
-static int mrfld_setup(struct mid_pb_ddata *ddata)
-{
- /* Unmask the PBIRQ and MPBIRQ on Tangier */
- intel_scu_ipc_dev_update(ddata->scu, BCOVE_PBIRQ, 0, MSIC_PWRBTNM);
- intel_scu_ipc_dev_update(ddata->scu, BCOVE_PBIRQMASK, 0, MSIC_PWRBTNM);
-
- return 0;
-}
-
-static irqreturn_t mid_pb_isr(int irq, void *dev_id)
-{
- struct mid_pb_ddata *ddata = dev_id;
- struct input_dev *input = ddata->input;
- int value = 0;
- int ret;
-
- ret = mid_pbstat(ddata, &value);
- 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, value);
- input_sync(input);
- }
-
- mid_irq_ack(ddata);
- return IRQ_HANDLED;
-}
-
-static const struct mid_pb_ddata mfld_ddata = {
- .mirqlvl1_addr = INTEL_MSIC_IRQLVL1MSK,
- .pbstat_addr = INTEL_MSIC_PBSTATUS,
- .pbstat_mask = MSIC_PB_LEVEL,
-};
-
-static const struct mid_pb_ddata mrfld_ddata = {
- .mirqlvl1_addr = BCOVE_IRQLVL1MSK,
- .pbstat_addr = BCOVE_PBSTATUS,
- .pbstat_mask = BCOVE_PB_LEVEL,
- .setup = mrfld_setup,
-};
-
-static const struct x86_cpu_id mid_pb_cpu_ids[] = {
- X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL_MID, &mfld_ddata),
- X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &mrfld_ddata),
- {}
-};
-
-static int mid_pb_probe(struct platform_device *pdev)
-{
- const struct x86_cpu_id *id;
- struct mid_pb_ddata *ddata;
- struct input_dev *input;
- int irq = platform_get_irq(pdev, 0);
- int error;
-
- id = x86_match_cpu(mid_pb_cpu_ids);
- if (!id)
- return -ENODEV;
-
- if (irq < 0) {
- dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
- return irq;
- }
-
- input = devm_input_allocate_device(&pdev->dev);
- if (!input)
- 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);
-
- ddata = devm_kmemdup(&pdev->dev, (void *)id->driver_data,
- sizeof(*ddata), GFP_KERNEL);
- if (!ddata)
- return -ENOMEM;
-
- ddata->dev = &pdev->dev;
- ddata->irq = irq;
- ddata->input = input;
-
- if (ddata->setup) {
- error = ddata->setup(ddata);
- if (error)
- return error;
- }
-
- ddata->scu = devm_intel_scu_ipc_dev_get(&pdev->dev);
- if (!ddata->scu)
- return -EPROBE_DEFER;
-
- error = devm_request_threaded_irq(&pdev->dev, irq, NULL, mid_pb_isr,
- IRQF_ONESHOT, DRIVER_NAME, ddata);
- if (error) {
- dev_err(&pdev->dev,
- "Unable to request irq %d for MID power button\n", irq);
- return error;
- }
-
- error = input_register_device(input);
- if (error) {
- dev_err(&pdev->dev,
- "Unable to register input dev, error %d\n", error);
- return error;
- }
-
- platform_set_drvdata(pdev, ddata);
-
- /*
- * 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 = mid_irq_ack(ddata);
- if (error) {
- dev_err(&pdev->dev,
- "Unable to clear power button interrupt, error: %d\n",
- error);
- return error;
- }
-
- device_init_wakeup(&pdev->dev, true);
- dev_pm_set_wake_irq(&pdev->dev, irq);
-
- return 0;
-}
-
-static int mid_pb_remove(struct platform_device *pdev)
-{
- dev_pm_clear_wake_irq(&pdev->dev);
- device_init_wakeup(&pdev->dev, false);
-
- return 0;
-}
-
-static struct platform_driver mid_pb_driver = {
- .driver = {
- .name = DRIVER_NAME,
- },
- .probe = mid_pb_probe,
- .remove = mid_pb_remove,
-};
-
-module_platform_driver(mid_pb_driver);
-
-MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
-MODULE_DESCRIPTION("Intel MID Power Button Driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRIVER_NAME);
projects / users / jedix / linux-maple.git / commitdiff