/* * max7359_keypad.c - MAX7359 Key Switch Controller Driver * * Copyright (C) 2009 Samsung Electronics * Kim Kyuwon * * Based on pxa27x_keypad.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456 */ #include #include #include #include #include #include #include #define MAX7359_MAX_KEY_ROWS 8 #define MAX7359_MAX_KEY_COLS 8 #define MAX7359_MAX_KEY_NUM (MAX7359_MAX_KEY_ROWS * MAX7359_MAX_KEY_COLS) #define MAX7359_ROW_SHIFT 3 /* * MAX7359 registers */ #define MAX7359_REG_KEYFIFO 0x00 #define MAX7359_REG_CONFIG 0x01 #define MAX7359_REG_DEBOUNCE 0x02 #define MAX7359_REG_INTERRUPT 0x03 #define MAX7359_REG_PORTS 0x04 #define MAX7359_REG_KEYREP 0x05 #define MAX7359_REG_SLEEP 0x06 /* * Configuration register bits */ #define MAX7359_CFG_SLEEP (1 << 7) #define MAX7359_CFG_INTERRUPT (1 << 5) #define MAX7359_CFG_KEY_RELEASE (1 << 3) #define MAX7359_CFG_WAKEUP (1 << 1) #define MAX7359_CFG_TIMEOUT (1 << 0) /* * Autosleep register values (ms) */ #define MAX7359_AUTOSLEEP_8192 0x01 #define MAX7359_AUTOSLEEP_4096 0x02 #define MAX7359_AUTOSLEEP_2048 0x03 #define MAX7359_AUTOSLEEP_1024 0x04 #define MAX7359_AUTOSLEEP_512 0x05 #define MAX7359_AUTOSLEEP_256 0x06 struct max7359_keypad { /* matrix key code map */ unsigned short keycodes[MAX7359_MAX_KEY_NUM]; struct input_dev *input_dev; struct i2c_client *client; }; static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val) { int ret = i2c_smbus_write_byte_data(client, reg, val); if (ret < 0) dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, reg, val, ret); return ret; } static int max7359_read_reg(struct i2c_client *client, int reg) { int ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) dev_err(&client->dev, "%s: reg 0x%x, err %d\n", __func__, reg, ret); return ret; } /* runs in an IRQ thread -- can (and will!) sleep */ static irqreturn_t max7359_interrupt(int irq, void *dev_id) { struct max7359_keypad *keypad = dev_id; struct input_dev *input_dev = keypad->input_dev; int val, row, col, release, code; val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO); row = val & 0x7; col = (val >> 3) & 0x7; release = val & 0x40; code = MATRIX_SCAN_CODE(row, col, MAX7359_ROW_SHIFT); dev_dbg(&keypad->client->dev, "key[%d:%d] %s\n", row, col, release ? "release" : "press"); input_event(input_dev, EV_MSC, MSC_SCAN, code); input_report_key(input_dev, keypad->keycodes[code], !release); input_sync(input_dev); return IRQ_HANDLED; } /* * Let MAX7359 fall into a deep sleep: * If no keys are pressed, enter sleep mode for 8192 ms. And if any * key is pressed, the MAX7359 returns to normal operating mode. */ static inline void max7359_fall_deepsleep(struct i2c_client *client) { max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_8192); } /* * Let MAX7359 take a catnap: * Autosleep just for 256 ms. */ static inline void max7359_take_catnap(struct i2c_client *client) { max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_256); } static int max7359_open(struct input_dev *dev) { struct max7359_keypad *keypad = input_get_drvdata(dev); max7359_take_catnap(keypad->client); return 0; } static void max7359_close(struct input_dev *dev) { struct max7359_keypad *keypad = input_get_drvdata(dev); max7359_fall_deepsleep(keypad->client); } static void max7359_initialize(struct i2c_client *client) { max7359_write_reg(client, MAX7359_REG_CONFIG, MAX7359_CFG_KEY_RELEASE | /* Key release enable */ MAX7359_CFG_WAKEUP); /* Key press wakeup enable */ /* Full key-scan functionality */ max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F); /* nINT asserts every debounce cycles */ max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01); max7359_fall_deepsleep(client); } static int max7359_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct matrix_keymap_data *keymap_data = dev_get_platdata(&client->dev); struct max7359_keypad *keypad; struct input_dev *input_dev; int ret; int error; if (!client->irq) { dev_err(&client->dev, "The irq number should not be zero\n"); return -EINVAL; } /* Detect MAX7359: The initial Keys FIFO value is '0x3F' */ ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO); if (ret < 0) { dev_err(&client->dev, "failed to detect device\n"); return -ENODEV; } dev_dbg(&client->dev, "keys FIFO is 0x%02x\n", ret); keypad = devm_kzalloc(&client->dev, sizeof(struct max7359_keypad), GFP_KERNEL); if (!keypad) { dev_err(&client->dev, "failed to allocate memory\n"); return -ENOMEM; } input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) { dev_err(&client->dev, "failed to allocate input device\n"); return -ENOMEM; } keypad->client = client; keypad->input_dev = input_dev; input_dev->name = client->name; input_dev->id.bustype = BUS_I2C; input_dev->open = max7359_open; input_dev->close = max7359_close; input_dev->dev.parent = &client->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); input_dev->keycodesize = sizeof(keypad->keycodes[0]); input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); input_dev->keycode = keypad->keycodes; input_set_capability(input_dev, EV_MSC, MSC_SCAN); input_set_drvdata(input_dev, keypad); error = matrix_keypad_build_keymap(keymap_data, NULL, MAX7359_MAX_KEY_ROWS, MAX7359_MAX_KEY_COLS, keypad->keycodes, input_dev); if (error) { dev_err(&client->dev, "failed to build keymap\n"); return error; } error = devm_request_threaded_irq(&client->dev, client->irq, NULL, max7359_interrupt, IRQF_TRIGGER_LOW | IRQF_ONESHOT, client->name, keypad); if (error) { dev_err(&client->dev, "failed to register interrupt\n"); return error; } /* Register the input device */ error = input_register_device(input_dev); if (error) { dev_err(&client->dev, "failed to register input device\n"); return error; } /* Initialize MAX7359 */ max7359_initialize(client); device_init_wakeup(&client->dev, 1); return 0; } #ifdef CONFIG_PM_SLEEP static int max7359_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); max7359_fall_deepsleep(client); if (device_may_wakeup(&client->dev)) enable_irq_wake(client->irq); return 0; } static int max7359_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); if (device_may_wakeup(&client->dev)) disable_irq_wake(client->irq); /* Restore the default setting */ max7359_take_catnap(client); return 0; } #endif static SIMPLE_DEV_PM_OPS(max7359_pm, max7359_suspend, max7359_resume); static const struct i2c_device_id max7359_ids[] = { { "max7359", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, max7359_ids); static struct i2c_driver max7359_i2c_driver = { .driver = { .name = "max7359", .pm = &max7359_pm, }, .probe = max7359_probe, .id_table = max7359_ids, }; module_i2c_driver(max7359_i2c_driver); MODULE_AUTHOR("Kim Kyuwon "); MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver"); MODULE_LICENSE("GPL v2");