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185 lines
4.5 KiB
185 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Cirrus Logic CLPS711X Keypad driver |
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* |
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* Copyright (C) 2014 Alexander Shiyan <[email protected]> |
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*/ |
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#include <linux/input.h> |
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#include <linux/module.h> |
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#include <linux/of_gpio.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/sched.h> |
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#include <linux/input/matrix_keypad.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/mfd/syscon/clps711x.h> |
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#define CLPS711X_KEYPAD_COL_COUNT 8 |
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struct clps711x_gpio_data { |
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struct gpio_desc *desc; |
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DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT); |
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}; |
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struct clps711x_keypad_data { |
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struct regmap *syscon; |
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int row_count; |
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unsigned int row_shift; |
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struct clps711x_gpio_data *gpio_data; |
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}; |
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static void clps711x_keypad_poll(struct input_dev *input) |
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{ |
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const unsigned short *keycodes = input->keycode; |
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struct clps711x_keypad_data *priv = input_get_drvdata(input); |
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bool sync = false; |
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int col, row; |
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for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) { |
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/* Assert column */ |
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regmap_update_bits(priv->syscon, SYSCON_OFFSET, |
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SYSCON1_KBDSCAN_MASK, |
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SYSCON1_KBDSCAN(8 + col)); |
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/* Scan rows */ |
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for (row = 0; row < priv->row_count; row++) { |
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struct clps711x_gpio_data *data = &priv->gpio_data[row]; |
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bool state, state1; |
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/* Read twice for protection against fluctuations */ |
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do { |
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state = gpiod_get_value_cansleep(data->desc); |
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cond_resched(); |
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state1 = gpiod_get_value_cansleep(data->desc); |
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} while (state != state1); |
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if (test_bit(col, data->last_state) != state) { |
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int code = MATRIX_SCAN_CODE(row, col, |
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priv->row_shift); |
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if (state) { |
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set_bit(col, data->last_state); |
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input_event(input, |
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EV_MSC, MSC_SCAN, code); |
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} else { |
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clear_bit(col, data->last_state); |
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} |
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if (keycodes[code]) |
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input_report_key(input, |
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keycodes[code], state); |
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sync = true; |
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} |
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} |
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/* Set all columns to low */ |
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regmap_update_bits(priv->syscon, SYSCON_OFFSET, |
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SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1)); |
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} |
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if (sync) |
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input_sync(input); |
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} |
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static int clps711x_keypad_probe(struct platform_device *pdev) |
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{ |
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struct clps711x_keypad_data *priv; |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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struct input_dev *input; |
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u32 poll_interval; |
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int i, err; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->syscon = |
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syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1"); |
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if (IS_ERR(priv->syscon)) |
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return PTR_ERR(priv->syscon); |
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priv->row_count = of_gpio_named_count(np, "row-gpios"); |
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if (priv->row_count < 1) |
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return -EINVAL; |
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priv->gpio_data = devm_kcalloc(dev, |
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priv->row_count, sizeof(*priv->gpio_data), |
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GFP_KERNEL); |
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if (!priv->gpio_data) |
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return -ENOMEM; |
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priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT); |
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for (i = 0; i < priv->row_count; i++) { |
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struct clps711x_gpio_data *data = &priv->gpio_data[i]; |
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data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN); |
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if (IS_ERR(data->desc)) |
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return PTR_ERR(data->desc); |
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} |
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err = of_property_read_u32(np, "poll-interval", &poll_interval); |
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if (err) |
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return err; |
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input = devm_input_allocate_device(dev); |
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if (!input) |
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return -ENOMEM; |
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input_set_drvdata(input, priv); |
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input->name = pdev->name; |
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input->dev.parent = dev; |
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input->id.bustype = BUS_HOST; |
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input->id.vendor = 0x0001; |
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input->id.product = 0x0001; |
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input->id.version = 0x0100; |
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err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count, |
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CLPS711X_KEYPAD_COL_COUNT, |
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NULL, input); |
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if (err) |
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return err; |
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input_set_capability(input, EV_MSC, MSC_SCAN); |
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if (of_property_read_bool(np, "autorepeat")) |
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__set_bit(EV_REP, input->evbit); |
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/* Set all columns to low */ |
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regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK, |
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SYSCON1_KBDSCAN(1)); |
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err = input_setup_polling(input, clps711x_keypad_poll); |
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if (err) |
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return err; |
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input_set_poll_interval(input, poll_interval); |
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err = input_register_device(input); |
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if (err) |
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return err; |
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return 0; |
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} |
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static const struct of_device_id clps711x_keypad_of_match[] = { |
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{ .compatible = "cirrus,ep7209-keypad", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match); |
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static struct platform_driver clps711x_keypad_driver = { |
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.driver = { |
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.name = "clps711x-keypad", |
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.of_match_table = clps711x_keypad_of_match, |
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}, |
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.probe = clps711x_keypad_probe, |
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}; |
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module_platform_driver(clps711x_keypad_driver); |
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MODULE_AUTHOR("Alexander Shiyan <[email protected]>"); |
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MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver"); |
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MODULE_LICENSE("GPL");
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