1a88638c4SRandy Dunlap /* 2104a5f3cSDmitry Torokhov * MAX8925 ONKEY driver 33734574cSHaojian Zhuang * 43734574cSHaojian Zhuang * Copyright (C) 2009 Marvell International Ltd. 53734574cSHaojian Zhuang * Haojian Zhuang <haojian.zhuang@marvell.com> 63734574cSHaojian Zhuang * 73734574cSHaojian Zhuang * This file is subject to the terms and conditions of the GNU General 83734574cSHaojian Zhuang * Public License. See the file "COPYING" in the main directory of this 93734574cSHaojian Zhuang * archive for more details. 103734574cSHaojian Zhuang * 113734574cSHaojian Zhuang * This program is distributed in the hope that it will be useful, 123734574cSHaojian Zhuang * but WITHOUT ANY WARRANTY; without even the implied warranty of 133734574cSHaojian Zhuang * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 143734574cSHaojian Zhuang * GNU General Public License for more details. 153734574cSHaojian Zhuang * 163734574cSHaojian Zhuang * You should have received a copy of the GNU General Public License 173734574cSHaojian Zhuang * along with this program; if not, write to the Free Software 183734574cSHaojian Zhuang * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 193734574cSHaojian Zhuang */ 203734574cSHaojian Zhuang 213734574cSHaojian Zhuang #include <linux/kernel.h> 223734574cSHaojian Zhuang #include <linux/module.h> 233734574cSHaojian Zhuang #include <linux/platform_device.h> 243734574cSHaojian Zhuang #include <linux/i2c.h> 253734574cSHaojian Zhuang #include <linux/input.h> 263734574cSHaojian Zhuang #include <linux/interrupt.h> 273734574cSHaojian Zhuang #include <linux/mfd/max8925.h> 283734574cSHaojian Zhuang #include <linux/slab.h> 2904115e41SHimangi Saraogi #include <linux/device.h> 303734574cSHaojian Zhuang 312d95ae3bSHaojian Zhuang #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ 323734574cSHaojian Zhuang #define HARDRESET_EN (1 << 7) 333734574cSHaojian Zhuang #define PWREN_EN (1 << 7) 343734574cSHaojian Zhuang 353734574cSHaojian Zhuang struct max8925_onkey_info { 363734574cSHaojian Zhuang struct input_dev *idev; 373734574cSHaojian Zhuang struct i2c_client *i2c; 382d95ae3bSHaojian Zhuang struct device *dev; 39104a5f3cSDmitry Torokhov unsigned int irq[2]; 403734574cSHaojian Zhuang }; 413734574cSHaojian Zhuang 423734574cSHaojian Zhuang /* 432d95ae3bSHaojian Zhuang * MAX8925 gives us an interrupt when ONKEY is pressed or released. 443734574cSHaojian Zhuang * max8925_set_bits() operates I2C bus and may sleep. So implement 453734574cSHaojian Zhuang * it in thread IRQ handler. 463734574cSHaojian Zhuang */ 473734574cSHaojian Zhuang static irqreturn_t max8925_onkey_handler(int irq, void *data) 483734574cSHaojian Zhuang { 493734574cSHaojian Zhuang struct max8925_onkey_info *info = data; 50104a5f3cSDmitry Torokhov int state; 513734574cSHaojian Zhuang 52104a5f3cSDmitry Torokhov state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); 53104a5f3cSDmitry Torokhov 54104a5f3cSDmitry Torokhov input_report_key(info->idev, KEY_POWER, state & SW_INPUT); 553734574cSHaojian Zhuang input_sync(info->idev); 563734574cSHaojian Zhuang 57104a5f3cSDmitry Torokhov dev_dbg(info->dev, "onkey state:%d\n", state); 582d95ae3bSHaojian Zhuang 593734574cSHaojian Zhuang /* Enable hardreset to halt if system isn't shutdown on time */ 603734574cSHaojian Zhuang max8925_set_bits(info->i2c, MAX8925_SYSENSEL, 613734574cSHaojian Zhuang HARDRESET_EN, HARDRESET_EN); 623734574cSHaojian Zhuang 633734574cSHaojian Zhuang return IRQ_HANDLED; 643734574cSHaojian Zhuang } 653734574cSHaojian Zhuang 665298cc4cSBill Pemberton static int max8925_onkey_probe(struct platform_device *pdev) 673734574cSHaojian Zhuang { 683734574cSHaojian Zhuang struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 693734574cSHaojian Zhuang struct max8925_onkey_info *info; 70104a5f3cSDmitry Torokhov struct input_dev *input; 712d95ae3bSHaojian Zhuang int irq[2], error; 722d95ae3bSHaojian Zhuang 732d95ae3bSHaojian Zhuang irq[0] = platform_get_irq(pdev, 0); 740bec8b7eSStephen Boyd if (irq[0] < 0) 752d95ae3bSHaojian Zhuang return -EINVAL; 76104a5f3cSDmitry Torokhov 772d95ae3bSHaojian Zhuang irq[1] = platform_get_irq(pdev, 1); 780bec8b7eSStephen Boyd if (irq[1] < 0) 792d95ae3bSHaojian Zhuang return -EINVAL; 803734574cSHaojian Zhuang 8104115e41SHimangi Saraogi info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info), 8204115e41SHimangi Saraogi GFP_KERNEL); 8304115e41SHimangi Saraogi if (!info) 8404115e41SHimangi Saraogi return -ENOMEM; 8504115e41SHimangi Saraogi 8604115e41SHimangi Saraogi input = devm_input_allocate_device(&pdev->dev); 8704115e41SHimangi Saraogi if (!input) 8804115e41SHimangi Saraogi return -ENOMEM; 893734574cSHaojian Zhuang 90104a5f3cSDmitry Torokhov info->idev = input; 913734574cSHaojian Zhuang info->i2c = chip->i2c; 922d95ae3bSHaojian Zhuang info->dev = &pdev->dev; 93104a5f3cSDmitry Torokhov info->irq[0] = irq[0]; 94104a5f3cSDmitry Torokhov info->irq[1] = irq[1]; 95104a5f3cSDmitry Torokhov 96104a5f3cSDmitry Torokhov input->name = "max8925_on"; 97104a5f3cSDmitry Torokhov input->phys = "max8925_on/input0"; 98104a5f3cSDmitry Torokhov input->id.bustype = BUS_I2C; 99104a5f3cSDmitry Torokhov input->dev.parent = &pdev->dev; 100104a5f3cSDmitry Torokhov input_set_capability(input, EV_KEY, KEY_POWER); 101104a5f3cSDmitry Torokhov 10204115e41SHimangi Saraogi error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL, 10304115e41SHimangi Saraogi max8925_onkey_handler, IRQF_ONESHOT, 10404115e41SHimangi Saraogi "onkey-down", info); 1052d95ae3bSHaojian Zhuang if (error < 0) { 1062d95ae3bSHaojian Zhuang dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 1072d95ae3bSHaojian Zhuang irq[0], error); 10804115e41SHimangi Saraogi return error; 1092d95ae3bSHaojian Zhuang } 110104a5f3cSDmitry Torokhov 11104115e41SHimangi Saraogi error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL, 11204115e41SHimangi Saraogi max8925_onkey_handler, IRQF_ONESHOT, 11304115e41SHimangi Saraogi "onkey-up", info); 1142d95ae3bSHaojian Zhuang if (error < 0) { 1152d95ae3bSHaojian Zhuang dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 1162d95ae3bSHaojian Zhuang irq[1], error); 11704115e41SHimangi Saraogi return error; 1182d95ae3bSHaojian Zhuang } 1193734574cSHaojian Zhuang 1203734574cSHaojian Zhuang error = input_register_device(info->idev); 1213734574cSHaojian Zhuang if (error) { 1223734574cSHaojian Zhuang dev_err(chip->dev, "Can't register input device: %d\n", error); 12304115e41SHimangi Saraogi return error; 1243734574cSHaojian Zhuang } 1253734574cSHaojian Zhuang 1263734574cSHaojian Zhuang platform_set_drvdata(pdev, info); 127104a5f3cSDmitry Torokhov device_init_wakeup(&pdev->dev, 1); 1283734574cSHaojian Zhuang 1293734574cSHaojian Zhuang return 0; 1303734574cSHaojian Zhuang } 1313734574cSHaojian Zhuang 132*1bf94844SJonathan Cameron static int max8925_onkey_suspend(struct device *dev) 133adab30d7SKevin Liu { 134adab30d7SKevin Liu struct platform_device *pdev = to_platform_device(dev); 135adab30d7SKevin Liu struct max8925_onkey_info *info = platform_get_drvdata(pdev); 136adab30d7SKevin Liu struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 137adab30d7SKevin Liu 138adab30d7SKevin Liu if (device_may_wakeup(dev)) { 139104a5f3cSDmitry Torokhov chip->wakeup_flag |= 1 << info->irq[0]; 140104a5f3cSDmitry Torokhov chip->wakeup_flag |= 1 << info->irq[1]; 141adab30d7SKevin Liu } 142adab30d7SKevin Liu 143adab30d7SKevin Liu return 0; 144adab30d7SKevin Liu } 145adab30d7SKevin Liu 146*1bf94844SJonathan Cameron static int max8925_onkey_resume(struct device *dev) 147adab30d7SKevin Liu { 148adab30d7SKevin Liu struct platform_device *pdev = to_platform_device(dev); 149adab30d7SKevin Liu struct max8925_onkey_info *info = platform_get_drvdata(pdev); 150adab30d7SKevin Liu struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 151adab30d7SKevin Liu 152adab30d7SKevin Liu if (device_may_wakeup(dev)) { 153104a5f3cSDmitry Torokhov chip->wakeup_flag &= ~(1 << info->irq[0]); 154104a5f3cSDmitry Torokhov chip->wakeup_flag &= ~(1 << info->irq[1]); 155adab30d7SKevin Liu } 156adab30d7SKevin Liu 157adab30d7SKevin Liu return 0; 158adab30d7SKevin Liu } 159adab30d7SKevin Liu 160*1bf94844SJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, 161*1bf94844SJonathan Cameron max8925_onkey_suspend, max8925_onkey_resume); 162adab30d7SKevin Liu 1633734574cSHaojian Zhuang static struct platform_driver max8925_onkey_driver = { 1643734574cSHaojian Zhuang .driver = { 1653734574cSHaojian Zhuang .name = "max8925-onkey", 166*1bf94844SJonathan Cameron .pm = pm_sleep_ptr(&max8925_onkey_pm_ops), 1673734574cSHaojian Zhuang }, 1683734574cSHaojian Zhuang .probe = max8925_onkey_probe, 1693734574cSHaojian Zhuang }; 170840a746bSJJ Ding module_platform_driver(max8925_onkey_driver); 1713734574cSHaojian Zhuang 1723734574cSHaojian Zhuang MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); 1733734574cSHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 1743734574cSHaojian Zhuang MODULE_LICENSE("GPL"); 175