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193 lines
4.8 KiB
193 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Keypad driver for Analog Devices ADP5520 MFD PMICs |
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* |
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* Copyright 2009 Analog Devices Inc. |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.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/adp5520.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
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struct adp5520_keys { |
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struct input_dev *input; |
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struct notifier_block notifier; |
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struct device *master; |
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unsigned short keycode[ADP5520_KEYMAPSIZE]; |
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}; |
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static void adp5520_keys_report_event(struct adp5520_keys *dev, |
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unsigned short keymask, int value) |
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{ |
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int i; |
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for (i = 0; i < ADP5520_MAXKEYS; i++) |
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if (keymask & (1 << i)) |
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input_report_key(dev->input, dev->keycode[i], value); |
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input_sync(dev->input); |
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} |
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static int adp5520_keys_notifier(struct notifier_block *nb, |
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unsigned long event, void *data) |
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{ |
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struct adp5520_keys *dev; |
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uint8_t reg_val_lo, reg_val_hi; |
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unsigned short keymask; |
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dev = container_of(nb, struct adp5520_keys, notifier); |
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if (event & ADP5520_KP_INT) { |
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adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo); |
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adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi); |
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keymask = (reg_val_hi << 8) | reg_val_lo; |
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/* Read twice to clear */ |
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adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo); |
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adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi); |
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keymask |= (reg_val_hi << 8) | reg_val_lo; |
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adp5520_keys_report_event(dev, keymask, 1); |
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} |
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if (event & ADP5520_KR_INT) { |
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adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo); |
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adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi); |
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keymask = (reg_val_hi << 8) | reg_val_lo; |
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/* Read twice to clear */ |
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adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo); |
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adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi); |
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keymask |= (reg_val_hi << 8) | reg_val_lo; |
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adp5520_keys_report_event(dev, keymask, 0); |
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} |
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return 0; |
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} |
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static int adp5520_keys_probe(struct platform_device *pdev) |
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{ |
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struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev); |
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struct input_dev *input; |
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struct adp5520_keys *dev; |
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int ret, i; |
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unsigned char en_mask, ctl_mask = 0; |
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if (pdev->id != ID_ADP5520) { |
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dev_err(&pdev->dev, "only ADP5520 supports Keypad\n"); |
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return -EINVAL; |
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} |
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if (!pdata) { |
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dev_err(&pdev->dev, "missing platform data\n"); |
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return -EINVAL; |
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} |
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if (!(pdata->rows_en_mask && pdata->cols_en_mask)) |
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return -EINVAL; |
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dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); |
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if (!dev) { |
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dev_err(&pdev->dev, "failed to alloc memory\n"); |
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return -ENOMEM; |
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} |
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input = devm_input_allocate_device(&pdev->dev); |
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if (!input) |
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return -ENOMEM; |
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dev->master = pdev->dev.parent; |
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dev->input = input; |
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input->name = pdev->name; |
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input->phys = "adp5520-keys/input0"; |
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input->dev.parent = &pdev->dev; |
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input->id.bustype = BUS_I2C; |
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input->id.vendor = 0x0001; |
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input->id.product = 0x5520; |
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input->id.version = 0x0001; |
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input->keycodesize = sizeof(dev->keycode[0]); |
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input->keycodemax = pdata->keymapsize; |
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input->keycode = dev->keycode; |
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memcpy(dev->keycode, pdata->keymap, |
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pdata->keymapsize * input->keycodesize); |
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/* setup input device */ |
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__set_bit(EV_KEY, input->evbit); |
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if (pdata->repeat) |
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__set_bit(EV_REP, input->evbit); |
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for (i = 0; i < input->keycodemax; i++) |
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__set_bit(dev->keycode[i], input->keybit); |
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__clear_bit(KEY_RESERVED, input->keybit); |
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ret = input_register_device(input); |
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if (ret) { |
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dev_err(&pdev->dev, "unable to register input device\n"); |
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return ret; |
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} |
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en_mask = pdata->rows_en_mask | pdata->cols_en_mask; |
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ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask); |
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if (en_mask & ADP5520_COL_C3) |
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ctl_mask |= ADP5520_C3_MODE; |
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if (en_mask & ADP5520_ROW_R3) |
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ctl_mask |= ADP5520_R3_MODE; |
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if (ctl_mask) |
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ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, |
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ctl_mask); |
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ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, |
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pdata->rows_en_mask); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to write\n"); |
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return -EIO; |
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} |
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dev->notifier.notifier_call = adp5520_keys_notifier; |
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ret = adp5520_register_notifier(dev->master, &dev->notifier, |
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ADP5520_KP_IEN | ADP5520_KR_IEN); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to register notifier\n"); |
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return ret; |
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} |
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platform_set_drvdata(pdev, dev); |
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return 0; |
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} |
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static int adp5520_keys_remove(struct platform_device *pdev) |
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{ |
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struct adp5520_keys *dev = platform_get_drvdata(pdev); |
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adp5520_unregister_notifier(dev->master, &dev->notifier, |
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ADP5520_KP_IEN | ADP5520_KR_IEN); |
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return 0; |
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} |
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static struct platform_driver adp5520_keys_driver = { |
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.driver = { |
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.name = "adp5520-keys", |
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}, |
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.probe = adp5520_keys_probe, |
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.remove = adp5520_keys_remove, |
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}; |
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module_platform_driver(adp5520_keys_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("Keys ADP5520 Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:adp5520-keys");
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