diff options
Diffstat (limited to 'drivers/input/keyboard/adp5520-keys.c')
| -rw-r--r-- | drivers/input/keyboard/adp5520-keys.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/input/keyboard/adp5520-keys.c b/drivers/input/keyboard/adp5520-keys.c new file mode 100644 index 000000000..7851ffd67 --- /dev/null +++ b/drivers/input/keyboard/adp5520-keys.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Keypad driver for Analog Devices ADP5520 MFD PMICs + * + * Copyright 2009 Analog Devices Inc. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/input.h> +#include <linux/mfd/adp5520.h> +#include <linux/slab.h> +#include <linux/device.h> + +struct adp5520_keys { + struct input_dev *input; + struct notifier_block notifier; + struct device *master; + unsigned short keycode[ADP5520_KEYMAPSIZE]; +}; + +static void adp5520_keys_report_event(struct adp5520_keys *dev, + unsigned short keymask, int value) +{ + int i; + + for (i = 0; i < ADP5520_MAXKEYS; i++) + if (keymask & (1 << i)) + input_report_key(dev->input, dev->keycode[i], value); + + input_sync(dev->input); +} + +static int adp5520_keys_notifier(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct adp5520_keys *dev; + uint8_t reg_val_lo, reg_val_hi; + unsigned short keymask; + + dev = container_of(nb, struct adp5520_keys, notifier); + + if (event & ADP5520_KP_INT) { + adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo); + adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi); + + keymask = (reg_val_hi << 8) | reg_val_lo; + /* Read twice to clear */ + adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo); + adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi); + keymask |= (reg_val_hi << 8) | reg_val_lo; + adp5520_keys_report_event(dev, keymask, 1); + } + + if (event & ADP5520_KR_INT) { + adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo); + adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi); + + keymask = (reg_val_hi << 8) | reg_val_lo; + /* Read twice to clear */ + adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo); + adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi); + keymask |= (reg_val_hi << 8) | reg_val_lo; + adp5520_keys_report_event(dev, keymask, 0); + } + + return 0; +} + +static int adp5520_keys_probe(struct platform_device *pdev) +{ + struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct input_dev *input; + struct adp5520_keys *dev; + int ret, i; + unsigned char en_mask, ctl_mask = 0; + + if (pdev->id != ID_ADP5520) { + dev_err(&pdev->dev, "only ADP5520 supports Keypad\n"); + return -EINVAL; + } + + if (!pdata) { + dev_err(&pdev->dev, "missing platform data\n"); + return -EINVAL; + } + + if (!(pdata->rows_en_mask && pdata->cols_en_mask)) + return -EINVAL; + + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) { + dev_err(&pdev->dev, "failed to alloc memory\n"); + return -ENOMEM; + } + + input = devm_input_allocate_device(&pdev->dev); + if (!input) + return -ENOMEM; + + dev->master = pdev->dev.parent; + dev->input = input; + + input->name = pdev->name; + input->phys = "adp5520-keys/input0"; + input->dev.parent = &pdev->dev; + + input->id.bustype = BUS_I2C; + input->id.vendor = 0x0001; + input->id.product = 0x5520; + input->id.version = 0x0001; + + input->keycodesize = sizeof(dev->keycode[0]); + input->keycodemax = pdata->keymapsize; + input->keycode = dev->keycode; + + memcpy(dev->keycode, pdata->keymap, + pdata->keymapsize * input->keycodesize); + + /* setup input device */ + __set_bit(EV_KEY, input->evbit); + + if (pdata->repeat) + __set_bit(EV_REP, input->evbit); + + for (i = 0; i < input->keycodemax; i++) + __set_bit(dev->keycode[i], input->keybit); + __clear_bit(KEY_RESERVED, input->keybit); + + ret = input_register_device(input); + if (ret) { + dev_err(&pdev->dev, "unable to register input device\n"); + return ret; + } + + en_mask = pdata->rows_en_mask | pdata->cols_en_mask; + + ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask); + + if (en_mask & ADP5520_COL_C3) + ctl_mask |= ADP5520_C3_MODE; + + if (en_mask & ADP5520_ROW_R3) + ctl_mask |= ADP5520_R3_MODE; + + if (ctl_mask) + ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, + ctl_mask); + + ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, + pdata->rows_en_mask); + + if (ret) { + dev_err(&pdev->dev, "failed to write\n"); + return -EIO; + } + + dev->notifier.notifier_call = adp5520_keys_notifier; + ret = adp5520_register_notifier(dev->master, &dev->notifier, + ADP5520_KP_IEN | ADP5520_KR_IEN); + if (ret) { + dev_err(&pdev->dev, "failed to register notifier\n"); + return ret; + } + + platform_set_drvdata(pdev, dev); + return 0; +} + +static int adp5520_keys_remove(struct platform_device *pdev) +{ + struct adp5520_keys *dev = platform_get_drvdata(pdev); + + adp5520_unregister_notifier(dev->master, &dev->notifier, + ADP5520_KP_IEN | ADP5520_KR_IEN); + + return 0; +} + +static struct platform_driver adp5520_keys_driver = { + .driver = { + .name = "adp5520-keys", + }, + .probe = adp5520_keys_probe, + .remove = adp5520_keys_remove, +}; +module_platform_driver(adp5520_keys_driver); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Keys ADP5520 Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:adp5520-keys"); |