clps711x-keypad.c 4.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Cirrus Logic CLPS711X Keypad driver
  4. *
  5. * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
  6. */
  7. #include <linux/input.h>
  8. #include <linux/module.h>
  9. #include <linux/of_gpio.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/regmap.h>
  12. #include <linux/sched.h>
  13. #include <linux/input/matrix_keypad.h>
  14. #include <linux/mfd/syscon.h>
  15. #include <linux/mfd/syscon/clps711x.h>
  16. #define CLPS711X_KEYPAD_COL_COUNT 8
  17. struct clps711x_gpio_data {
  18. struct gpio_desc *desc;
  19. DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
  20. };
  21. struct clps711x_keypad_data {
  22. struct regmap *syscon;
  23. int row_count;
  24. unsigned int row_shift;
  25. struct clps711x_gpio_data *gpio_data;
  26. };
  27. static void clps711x_keypad_poll(struct input_dev *input)
  28. {
  29. const unsigned short *keycodes = input->keycode;
  30. struct clps711x_keypad_data *priv = input_get_drvdata(input);
  31. bool sync = false;
  32. int col, row;
  33. for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
  34. /* Assert column */
  35. regmap_update_bits(priv->syscon, SYSCON_OFFSET,
  36. SYSCON1_KBDSCAN_MASK,
  37. SYSCON1_KBDSCAN(8 + col));
  38. /* Scan rows */
  39. for (row = 0; row < priv->row_count; row++) {
  40. struct clps711x_gpio_data *data = &priv->gpio_data[row];
  41. bool state, state1;
  42. /* Read twice for protection against fluctuations */
  43. do {
  44. state = gpiod_get_value_cansleep(data->desc);
  45. cond_resched();
  46. state1 = gpiod_get_value_cansleep(data->desc);
  47. } while (state != state1);
  48. if (test_bit(col, data->last_state) != state) {
  49. int code = MATRIX_SCAN_CODE(row, col,
  50. priv->row_shift);
  51. if (state) {
  52. set_bit(col, data->last_state);
  53. input_event(input,
  54. EV_MSC, MSC_SCAN, code);
  55. } else {
  56. clear_bit(col, data->last_state);
  57. }
  58. if (keycodes[code])
  59. input_report_key(input,
  60. keycodes[code], state);
  61. sync = true;
  62. }
  63. }
  64. /* Set all columns to low */
  65. regmap_update_bits(priv->syscon, SYSCON_OFFSET,
  66. SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
  67. }
  68. if (sync)
  69. input_sync(input);
  70. }
  71. static int clps711x_keypad_probe(struct platform_device *pdev)
  72. {
  73. struct clps711x_keypad_data *priv;
  74. struct device *dev = &pdev->dev;
  75. struct device_node *np = dev->of_node;
  76. struct input_dev *input;
  77. u32 poll_interval;
  78. int i, err;
  79. priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  80. if (!priv)
  81. return -ENOMEM;
  82. priv->syscon =
  83. syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1");
  84. if (IS_ERR(priv->syscon))
  85. return PTR_ERR(priv->syscon);
  86. priv->row_count = of_gpio_named_count(np, "row-gpios");
  87. if (priv->row_count < 1)
  88. return -EINVAL;
  89. priv->gpio_data = devm_kcalloc(dev,
  90. priv->row_count, sizeof(*priv->gpio_data),
  91. GFP_KERNEL);
  92. if (!priv->gpio_data)
  93. return -ENOMEM;
  94. priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
  95. for (i = 0; i < priv->row_count; i++) {
  96. struct clps711x_gpio_data *data = &priv->gpio_data[i];
  97. data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
  98. if (IS_ERR(data->desc))
  99. return PTR_ERR(data->desc);
  100. }
  101. err = of_property_read_u32(np, "poll-interval", &poll_interval);
  102. if (err)
  103. return err;
  104. input = devm_input_allocate_device(dev);
  105. if (!input)
  106. return -ENOMEM;
  107. input_set_drvdata(input, priv);
  108. input->name = pdev->name;
  109. input->dev.parent = dev;
  110. input->id.bustype = BUS_HOST;
  111. input->id.vendor = 0x0001;
  112. input->id.product = 0x0001;
  113. input->id.version = 0x0100;
  114. err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
  115. CLPS711X_KEYPAD_COL_COUNT,
  116. NULL, input);
  117. if (err)
  118. return err;
  119. input_set_capability(input, EV_MSC, MSC_SCAN);
  120. if (of_property_read_bool(np, "autorepeat"))
  121. __set_bit(EV_REP, input->evbit);
  122. /* Set all columns to low */
  123. regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
  124. SYSCON1_KBDSCAN(1));
  125. err = input_setup_polling(input, clps711x_keypad_poll);
  126. if (err)
  127. return err;
  128. input_set_poll_interval(input, poll_interval);
  129. err = input_register_device(input);
  130. if (err)
  131. return err;
  132. return 0;
  133. }
  134. static const struct of_device_id clps711x_keypad_of_match[] = {
  135. { .compatible = "cirrus,ep7209-keypad", },
  136. { }
  137. };
  138. MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
  139. static struct platform_driver clps711x_keypad_driver = {
  140. .driver = {
  141. .name = "clps711x-keypad",
  142. .of_match_table = clps711x_keypad_of_match,
  143. },
  144. .probe = clps711x_keypad_probe,
  145. };
  146. module_platform_driver(clps711x_keypad_driver);
  147. MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  148. MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
  149. MODULE_LICENSE("GPL");