diff options
Diffstat (limited to 'drivers/input/keyboard/clps711x-keypad.c')
| -rw-r--r-- | drivers/input/keyboard/clps711x-keypad.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/input/keyboard/clps711x-keypad.c b/drivers/input/keyboard/clps711x-keypad.c new file mode 100644 index 000000000..4c1a3e611 --- /dev/null +++ b/drivers/input/keyboard/clps711x-keypad.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cirrus Logic CLPS711X Keypad driver + * + * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> + */ + +#include <linux/input.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/gpio/consumer.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/sched.h> +#include <linux/input/matrix_keypad.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/clps711x.h> + +#define CLPS711X_KEYPAD_COL_COUNT 8 + +struct clps711x_gpio_data { + struct gpio_desc *desc; + DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT); +}; + +struct clps711x_keypad_data { + struct regmap *syscon; + int row_count; + unsigned int row_shift; + struct clps711x_gpio_data *gpio_data; +}; + +static void clps711x_keypad_poll(struct input_dev *input) +{ + const unsigned short *keycodes = input->keycode; + struct clps711x_keypad_data *priv = input_get_drvdata(input); + bool sync = false; + int col, row; + + for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) { + /* Assert column */ + regmap_update_bits(priv->syscon, SYSCON_OFFSET, + SYSCON1_KBDSCAN_MASK, + SYSCON1_KBDSCAN(8 + col)); + + /* Scan rows */ + for (row = 0; row < priv->row_count; row++) { + struct clps711x_gpio_data *data = &priv->gpio_data[row]; + bool state, state1; + + /* Read twice for protection against fluctuations */ + do { + state = gpiod_get_value_cansleep(data->desc); + cond_resched(); + state1 = gpiod_get_value_cansleep(data->desc); + } while (state != state1); + + if (test_bit(col, data->last_state) != state) { + int code = MATRIX_SCAN_CODE(row, col, + priv->row_shift); + + if (state) { + set_bit(col, data->last_state); + input_event(input, + EV_MSC, MSC_SCAN, code); + } else { + clear_bit(col, data->last_state); + } + + if (keycodes[code]) + input_report_key(input, + keycodes[code], state); + sync = true; + } + } + + /* Set all columns to low */ + regmap_update_bits(priv->syscon, SYSCON_OFFSET, + SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1)); + } + + if (sync) + input_sync(input); +} + +static int clps711x_keypad_probe(struct platform_device *pdev) +{ + struct clps711x_keypad_data *priv; + struct device *dev = &pdev->dev; + struct input_dev *input; + u32 poll_interval; + int i, err; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon"); + if (IS_ERR(priv->syscon)) + return PTR_ERR(priv->syscon); + + priv->row_count = gpiod_count(dev, "row"); + if (priv->row_count < 1) + return -EINVAL; + + priv->gpio_data = devm_kcalloc(dev, + priv->row_count, sizeof(*priv->gpio_data), + GFP_KERNEL); + if (!priv->gpio_data) + return -ENOMEM; + + priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT); + + for (i = 0; i < priv->row_count; i++) { + struct clps711x_gpio_data *data = &priv->gpio_data[i]; + + data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN); + if (IS_ERR(data->desc)) + return PTR_ERR(data->desc); + } + + err = device_property_read_u32(dev, "poll-interval", &poll_interval); + if (err) + return err; + + input = devm_input_allocate_device(dev); + if (!input) + return -ENOMEM; + + input_set_drvdata(input, priv); + + input->name = pdev->name; + input->dev.parent = dev; + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count, + CLPS711X_KEYPAD_COL_COUNT, + NULL, input); + if (err) + return err; + + input_set_capability(input, EV_MSC, MSC_SCAN); + if (device_property_read_bool(dev, "autorepeat")) + __set_bit(EV_REP, input->evbit); + + /* Set all columns to low */ + regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK, + SYSCON1_KBDSCAN(1)); + + + err = input_setup_polling(input, clps711x_keypad_poll); + if (err) + return err; + + input_set_poll_interval(input, poll_interval); + + err = input_register_device(input); + if (err) + return err; + + return 0; +} + +static const struct of_device_id clps711x_keypad_of_match[] = { + { .compatible = "cirrus,ep7209-keypad", }, + { } +}; +MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match); + +static struct platform_driver clps711x_keypad_driver = { + .driver = { + .name = "clps711x-keypad", + .of_match_table = clps711x_keypad_of_match, + }, + .probe = clps711x_keypad_probe, +}; +module_platform_driver(clps711x_keypad_driver); + +MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); +MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver"); +MODULE_LICENSE("GPL"); |