diff options
Diffstat (limited to 'drivers/input/keyboard/mcs_touchkey.c')
| -rw-r--r-- | drivers/input/keyboard/mcs_touchkey.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c new file mode 100644 index 000000000..ac1637a33 --- /dev/null +++ b/drivers/input/keyboard/mcs_touchkey.c @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Touchkey driver for MELFAS MCS5000/5080 controller + * + * Copyright (C) 2010 Samsung Electronics Co.Ltd + * Author: HeungJun Kim <riverful.kim@samsung.com> + * Author: Joonyoung Shim <jy0922.shim@samsung.com> + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/input.h> +#include <linux/irq.h> +#include <linux/slab.h> +#include <linux/platform_data/mcs.h> +#include <linux/pm.h> + +/* MCS5000 Touchkey */ +#define MCS5000_TOUCHKEY_STATUS 0x04 +#define MCS5000_TOUCHKEY_STATUS_PRESS 7 +#define MCS5000_TOUCHKEY_FW 0x0a +#define MCS5000_TOUCHKEY_BASE_VAL 0x61 + +/* MCS5080 Touchkey */ +#define MCS5080_TOUCHKEY_STATUS 0x00 +#define MCS5080_TOUCHKEY_STATUS_PRESS 3 +#define MCS5080_TOUCHKEY_FW 0x01 +#define MCS5080_TOUCHKEY_BASE_VAL 0x1 + +enum mcs_touchkey_type { + MCS5000_TOUCHKEY, + MCS5080_TOUCHKEY, +}; + +struct mcs_touchkey_chip { + unsigned int status_reg; + unsigned int pressbit; + unsigned int press_invert; + unsigned int baseval; +}; + +struct mcs_touchkey_data { + void (*poweron)(bool); + + struct i2c_client *client; + struct input_dev *input_dev; + struct mcs_touchkey_chip chip; + unsigned int key_code; + unsigned int key_val; + unsigned short keycodes[]; +}; + +static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id) +{ + struct mcs_touchkey_data *data = dev_id; + struct mcs_touchkey_chip *chip = &data->chip; + struct i2c_client *client = data->client; + struct input_dev *input = data->input_dev; + unsigned int key_val; + unsigned int pressed; + int val; + + val = i2c_smbus_read_byte_data(client, chip->status_reg); + if (val < 0) { + dev_err(&client->dev, "i2c read error [%d]\n", val); + goto out; + } + + pressed = (val & (1 << chip->pressbit)) >> chip->pressbit; + if (chip->press_invert) + pressed ^= chip->press_invert; + + /* key_val is 0 when released, so we should use key_val of press. */ + if (pressed) { + key_val = val & (0xff >> (8 - chip->pressbit)); + if (!key_val) + goto out; + key_val -= chip->baseval; + data->key_code = data->keycodes[key_val]; + data->key_val = key_val; + } + + input_event(input, EV_MSC, MSC_SCAN, data->key_val); + input_report_key(input, data->key_code, pressed); + input_sync(input); + + dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code, + pressed ? "pressed" : "released"); + + out: + return IRQ_HANDLED; +} + +static int mcs_touchkey_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + const struct mcs_platform_data *pdata; + struct mcs_touchkey_data *data; + struct input_dev *input_dev; + unsigned int fw_reg; + int fw_ver; + int error; + int i; + + pdata = dev_get_platdata(&client->dev); + if (!pdata) { + dev_err(&client->dev, "no platform data defined\n"); + return -EINVAL; + } + + data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1), + GFP_KERNEL); + input_dev = input_allocate_device(); + if (!data || !input_dev) { + dev_err(&client->dev, "Failed to allocate memory\n"); + error = -ENOMEM; + goto err_free_mem; + } + + data->client = client; + data->input_dev = input_dev; + + if (id->driver_data == MCS5000_TOUCHKEY) { + data->chip.status_reg = MCS5000_TOUCHKEY_STATUS; + data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS; + data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL; + fw_reg = MCS5000_TOUCHKEY_FW; + } else { + data->chip.status_reg = MCS5080_TOUCHKEY_STATUS; + data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS; + data->chip.press_invert = 1; + data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL; + fw_reg = MCS5080_TOUCHKEY_FW; + } + + fw_ver = i2c_smbus_read_byte_data(client, fw_reg); + if (fw_ver < 0) { + error = fw_ver; + dev_err(&client->dev, "i2c read error[%d]\n", error); + goto err_free_mem; + } + dev_info(&client->dev, "Firmware version: %d\n", fw_ver); + + input_dev->name = "MELFAS MCS Touchkey"; + input_dev->id.bustype = BUS_I2C; + input_dev->dev.parent = &client->dev; + input_dev->evbit[0] = BIT_MASK(EV_KEY); + if (!pdata->no_autorepeat) + input_dev->evbit[0] |= BIT_MASK(EV_REP); + input_dev->keycode = data->keycodes; + input_dev->keycodesize = sizeof(data->keycodes[0]); + input_dev->keycodemax = pdata->key_maxval + 1; + + for (i = 0; i < pdata->keymap_size; i++) { + unsigned int val = MCS_KEY_VAL(pdata->keymap[i]); + unsigned int code = MCS_KEY_CODE(pdata->keymap[i]); + + data->keycodes[val] = code; + __set_bit(code, input_dev->keybit); + } + + input_set_capability(input_dev, EV_MSC, MSC_SCAN); + input_set_drvdata(input_dev, data); + + if (pdata->cfg_pin) + pdata->cfg_pin(); + + if (pdata->poweron) { + data->poweron = pdata->poweron; + data->poweron(true); + } + + error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + client->dev.driver->name, data); + if (error) { + dev_err(&client->dev, "Failed to register interrupt\n"); + goto err_free_mem; + } + + error = input_register_device(input_dev); + if (error) + goto err_free_irq; + + i2c_set_clientdata(client, data); + return 0; + +err_free_irq: + free_irq(client->irq, data); +err_free_mem: + input_free_device(input_dev); + kfree(data); + return error; +} + +static void mcs_touchkey_remove(struct i2c_client *client) +{ + struct mcs_touchkey_data *data = i2c_get_clientdata(client); + + free_irq(client->irq, data); + if (data->poweron) + data->poweron(false); + input_unregister_device(data->input_dev); + kfree(data); +} + +static void mcs_touchkey_shutdown(struct i2c_client *client) +{ + struct mcs_touchkey_data *data = i2c_get_clientdata(client); + + if (data->poweron) + data->poweron(false); +} + +#ifdef CONFIG_PM_SLEEP +static int mcs_touchkey_suspend(struct device *dev) +{ + struct mcs_touchkey_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + + /* Disable the work */ + disable_irq(client->irq); + + /* Finally turn off the power */ + if (data->poweron) + data->poweron(false); + + return 0; +} + +static int mcs_touchkey_resume(struct device *dev) +{ + struct mcs_touchkey_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + + /* Enable the device first */ + if (data->poweron) + data->poweron(true); + + /* Enable irq again */ + enable_irq(client->irq); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops, + mcs_touchkey_suspend, mcs_touchkey_resume); + +static const struct i2c_device_id mcs_touchkey_id[] = { + { "mcs5000_touchkey", MCS5000_TOUCHKEY }, + { "mcs5080_touchkey", MCS5080_TOUCHKEY }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); + +static struct i2c_driver mcs_touchkey_driver = { + .driver = { + .name = "mcs_touchkey", + .pm = &mcs_touchkey_pm_ops, + }, + .probe = mcs_touchkey_probe, + .remove = mcs_touchkey_remove, + .shutdown = mcs_touchkey_shutdown, + .id_table = mcs_touchkey_id, +}; + +module_i2c_driver(mcs_touchkey_driver); + +/* Module information */ +MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); +MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>"); +MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller"); +MODULE_LICENSE("GPL"); |