#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/dev_printk.h>
#include <linux/device/devres.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/interrupt.h>
#include <linux/mfd/max7360.h>
#include <linux/mod_devicetable.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
struct max7360_keypad {
struct input_dev *input;
unsigned int rows;
unsigned int cols;
unsigned int debounce_ms;
int irq;
struct regmap *regmap;
unsigned short keycodes[MAX7360_MAX_KEY_ROWS * MAX7360_MAX_KEY_COLS];
};
static irqreturn_t max7360_keypad_irq(int irq, void *data)
{
struct max7360_keypad *max7360_keypad = data;
struct device *dev = max7360_keypad->input->dev.parent;
unsigned int val;
unsigned int row, col;
unsigned int release;
unsigned int code;
int error;
error = regmap_read(max7360_keypad->regmap, MAX7360_REG_KEYFIFO, &val);
if (error) {
dev_err(dev, "Failed to read MAX7360 FIFO");
return IRQ_NONE;
}
if (val == MAX7360_FIFO_OVERFLOW) {
dev_warn(dev, "max7360 FIFO overflow");
error = regmap_read_poll_timeout(max7360_keypad->regmap, MAX7360_REG_KEYFIFO,
val, val != MAX7360_FIFO_OVERFLOW, 0, 1000);
if (error) {
dev_err(dev, "Failed to empty MAX7360 FIFO");
return IRQ_NONE;
}
}
if (val == MAX7360_FIFO_EMPTY) {
dev_dbg(dev, "Got a spurious interrupt");
return IRQ_NONE;
}
row = FIELD_GET(MAX7360_FIFO_ROW, val);
col = FIELD_GET(MAX7360_FIFO_COL, val);
release = val & MAX7360_FIFO_RELEASE;
code = MATRIX_SCAN_CODE(row, col, get_count_order(max7360_keypad->cols));
dev_dbg(dev, "key[%d:%d] %s\n", row, col, release ? "release" : "press");
input_event(max7360_keypad->input, EV_MSC, MSC_SCAN, code);
input_report_key(max7360_keypad->input, max7360_keypad->keycodes[code], !release);
input_sync(max7360_keypad->input);
return IRQ_HANDLED;
}
static int max7360_keypad_open(struct input_dev *pdev)
{
struct max7360_keypad *max7360_keypad = input_get_drvdata(pdev);
struct device *dev = max7360_keypad->input->dev.parent;
int error;
error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_CONFIG,
MAX7360_CFG_SLEEP, MAX7360_CFG_SLEEP);
if (error)
dev_err(dev, "Failed to write max7360 configuration: %d\n", error);
return error;
}
static void max7360_keypad_close(struct input_dev *pdev)
{
struct max7360_keypad *max7360_keypad = input_get_drvdata(pdev);
struct device *dev = max7360_keypad->input->dev.parent;
int error;
error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_CONFIG, MAX7360_CFG_SLEEP, 0);
if (error)
dev_err(dev, "Failed to write max7360 configuration: %d\n", error);
}
static int max7360_keypad_hw_init(struct max7360_keypad *max7360_keypad)
{
struct device *dev = max7360_keypad->input->dev.parent;
unsigned int val;
int error;
val = max7360_keypad->debounce_ms - MAX7360_DEBOUNCE_MIN;
error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_DEBOUNCE,
MAX7360_DEBOUNCE,
FIELD_PREP(MAX7360_DEBOUNCE, val));
if (error)
return dev_err_probe(dev, error,
"Failed to write max7360 debounce configuration\n");
error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_INTERRUPT,
MAX7360_INTERRUPT_TIME_MASK,
FIELD_PREP(MAX7360_INTERRUPT_TIME_MASK, 1));
if (error)
return dev_err_probe(dev, error,
"Failed to write max7360 keypad interrupt configuration\n");
return 0;
}
static int max7360_keypad_build_keymap(struct max7360_keypad *max7360_keypad)
{
struct input_dev *input_dev = max7360_keypad->input;
struct device *dev = input_dev->dev.parent->parent;
struct matrix_keymap_data keymap_data;
const char *propname = "linux,keymap";
unsigned int max_keys;
int error;
int size;
size = device_property_count_u32(dev, propname);
if (size <= 0) {
dev_err(dev, "missing or malformed property %s: %d\n", propname, size);
return size < 0 ? size : -EINVAL;
}
max_keys = max7360_keypad->cols * max7360_keypad->rows;
if (size > max_keys) {
dev_err(dev, "%s size overflow (%d vs max %u)\n", propname, size, max_keys);
return -EINVAL;
}
u32 *keys __free(kfree) = kmalloc_array(size, sizeof(*keys), GFP_KERNEL);
if (!keys)
return -ENOMEM;
error = device_property_read_u32_array(dev, propname, keys, size);
if (error) {
dev_err(dev, "failed to read %s property: %d\n", propname, error);
return error;
}
keymap_data.keymap = keys;
keymap_data.keymap_size = size;
error = matrix_keypad_build_keymap(&keymap_data, NULL,
max7360_keypad->rows, max7360_keypad->cols,
max7360_keypad->keycodes, max7360_keypad->input);
if (error)
return error;
return 0;
}
static int max7360_keypad_parse_fw(struct device *dev,
struct max7360_keypad *max7360_keypad,
bool *autorepeat)
{
int error;
error = matrix_keypad_parse_properties(dev->parent, &max7360_keypad->rows,
&max7360_keypad->cols);
if (error)
return error;
if (!max7360_keypad->rows || !max7360_keypad->cols ||
max7360_keypad->rows > MAX7360_MAX_KEY_ROWS ||
max7360_keypad->cols > MAX7360_MAX_KEY_COLS) {
dev_err(dev, "Invalid number of columns or rows (%ux%u)\n",
max7360_keypad->cols, max7360_keypad->rows);
return -EINVAL;
}
*autorepeat = device_property_read_bool(dev->parent, "autorepeat");
max7360_keypad->debounce_ms = MAX7360_DEBOUNCE_MIN;
error = device_property_read_u32(dev->parent, "keypad-debounce-delay-ms",
&max7360_keypad->debounce_ms);
if (error == -EINVAL) {
dev_info(dev, "Using default keypad-debounce-delay-ms: %u\n",
max7360_keypad->debounce_ms);
} else if (error < 0) {
dev_err(dev, "Failed to read keypad-debounce-delay-ms property\n");
return error;
}
if (!in_range(max7360_keypad->debounce_ms, MAX7360_DEBOUNCE_MIN,
MAX7360_DEBOUNCE_MAX - MAX7360_DEBOUNCE_MIN + 1)) {
dev_err(dev, "Invalid keypad-debounce-delay-ms: %u, should be between %u and %u.\n",
max7360_keypad->debounce_ms, MAX7360_DEBOUNCE_MIN, MAX7360_DEBOUNCE_MAX);
return -EINVAL;
}
return 0;
}
static int max7360_keypad_probe(struct platform_device *pdev)
{
struct max7360_keypad *max7360_keypad;
struct device *dev = &pdev->dev;
struct input_dev *input;
struct regmap *regmap;
bool autorepeat;
int error;
int irq;
regmap = dev_get_regmap(dev->parent, NULL);
if (!regmap)
return dev_err_probe(dev, -ENODEV, "Could not get parent regmap\n");
irq = fwnode_irq_get_byname(dev_fwnode(dev->parent), "intk");
if (irq < 0)
return dev_err_probe(dev, irq, "Failed to get IRQ\n");
max7360_keypad = devm_kzalloc(dev, sizeof(*max7360_keypad), GFP_KERNEL);
if (!max7360_keypad)
return -ENOMEM;
max7360_keypad->regmap = regmap;
error = max7360_keypad_parse_fw(dev, max7360_keypad, &autorepeat);
if (error)
return error;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
max7360_keypad->input = input;
input->id.bustype = BUS_I2C;
input->name = pdev->name;
input->open = max7360_keypad_open;
input->close = max7360_keypad_close;
error = max7360_keypad_build_keymap(max7360_keypad);
if (error)
return dev_err_probe(dev, error, "Failed to build keymap\n");
input_set_capability(input, EV_MSC, MSC_SCAN);
if (autorepeat)
__set_bit(EV_REP, input->evbit);
input_set_drvdata(input, max7360_keypad);
error = devm_request_threaded_irq(dev, irq, NULL, max7360_keypad_irq,
IRQF_ONESHOT,
"max7360-keypad", max7360_keypad);
if (error)
return dev_err_probe(dev, error, "Failed to register interrupt\n");
error = input_register_device(input);
if (error)
return dev_err_probe(dev, error, "Could not register input device\n");
error = max7360_keypad_hw_init(max7360_keypad);
if (error)
return dev_err_probe(dev, error, "Failed to initialize max7360 keypad\n");
device_init_wakeup(dev, true);
error = dev_pm_set_wake_irq(dev, irq);
if (error)
dev_warn(dev, "Failed to set up wakeup irq: %d\n", error);
return 0;
}
static void max7360_keypad_remove(struct platform_device *pdev)
{
dev_pm_clear_wake_irq(&pdev->dev);
device_init_wakeup(&pdev->dev, false);
}
static struct platform_driver max7360_keypad_driver = {
.driver = {
.name = "max7360-keypad",
},
.probe = max7360_keypad_probe,
.remove = max7360_keypad_remove,
};
module_platform_driver(max7360_keypad_driver);
MODULE_DESCRIPTION("MAX7360 Keypad driver");
MODULE_AUTHOR("Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>");
MODULE_LICENSE("GPL");
