diff options
Diffstat (limited to 'drivers/platform/x86/intel_mid_powerbtn.c')
| -rw-r--r-- | drivers/platform/x86/intel_mid_powerbtn.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_mid_powerbtn.c b/drivers/platform/x86/intel_mid_powerbtn.c new file mode 100644 index 00000000000..213e79ba68d --- /dev/null +++ b/drivers/platform/x86/intel_mid_powerbtn.c @@ -0,0 +1,148 @@ +/* + * 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 <asm/intel_scu_ipc.h> + +#define DRIVER_NAME "msic_power_btn" + +#define MSIC_IRQ_STAT 0x02 + #define MSIC_IRQ_PB (1 << 0) +#define MSIC_PB_CONFIG 0x3e +#define MSIC_PB_STATUS 0x3f + #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */ + +struct mfld_pb_priv { + struct input_dev *input; + unsigned int irq; +}; + +static irqreturn_t mfld_pb_isr(int irq, void *dev_id) +{ + struct mfld_pb_priv *priv = dev_id; + int ret; + u8 pbstat; + + ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat); + if (ret < 0) + return IRQ_HANDLED; + + input_event(priv->input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL)); + input_sync(priv->input); + + return IRQ_HANDLED; +} + +static int __devinit mfld_pb_probe(struct platform_device *pdev) +{ + struct mfld_pb_priv *priv; + struct input_dev *input; + int irq; + int error; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return -EINVAL; + + priv = kzalloc(sizeof(struct mfld_pb_priv), GFP_KERNEL); + input = input_allocate_device(); + if (!priv || !input) { + error = -ENOMEM; + goto err_free_mem; + } + + priv->input = input; + priv->irq = irq; + + 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(priv->irq, NULL, mfld_pb_isr, + 0, DRIVER_NAME, priv); + if (error) { + dev_err(&pdev->dev, + "unable to request irq %d for mfld power button\n", + irq); + goto err_free_mem; + } + + 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, priv); + return 0; + +err_free_irq: + free_irq(priv->irq, priv); +err_free_mem: + input_free_device(input); + kfree(priv); + return error; +} + +static int __devexit mfld_pb_remove(struct platform_device *pdev) +{ + struct mfld_pb_priv *priv = platform_get_drvdata(pdev); + + free_irq(priv->irq, priv); + input_unregister_device(priv->input); + kfree(priv); + + platform_set_drvdata(pdev, NULL); + return 0; +} + +static struct platform_driver mfld_pb_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, + .probe = mfld_pb_probe, + .remove = __devexit_p(mfld_pb_remove), +}; + +static int __init mfld_pb_init(void) +{ + return platform_driver_register(&mfld_pb_driver); +} +module_init(mfld_pb_init); + +static void __exit mfld_pb_exit(void) +{ + platform_driver_unregister(&mfld_pb_driver); +} +module_exit(mfld_pb_exit); + +MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>"); +MODULE_DESCRIPTION("Intel Medfield Power Button Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); |