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8#include <linux/input.h>
9#include <linux/input-polldev.h>
10#include <linux/module.h>
11#include <linux/of_gpio.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/sched.h>
15#include <linux/input/matrix_keypad.h>
16#include <linux/mfd/syscon.h>
17#include <linux/mfd/syscon/clps711x.h>
18
19#define CLPS711X_KEYPAD_COL_COUNT 8
20
21struct clps711x_gpio_data {
22 struct gpio_desc *desc;
23 DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
24};
25
26struct clps711x_keypad_data {
27 struct regmap *syscon;
28 int row_count;
29 unsigned int row_shift;
30 struct clps711x_gpio_data *gpio_data;
31};
32
33static void clps711x_keypad_poll(struct input_polled_dev *dev)
34{
35 const unsigned short *keycodes = dev->input->keycode;
36 struct clps711x_keypad_data *priv = dev->private;
37 bool sync = false;
38 int col, row;
39
40 for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
41
42 regmap_update_bits(priv->syscon, SYSCON_OFFSET,
43 SYSCON1_KBDSCAN_MASK,
44 SYSCON1_KBDSCAN(8 + col));
45
46
47 for (row = 0; row < priv->row_count; row++) {
48 struct clps711x_gpio_data *data = &priv->gpio_data[row];
49 bool state, state1;
50
51
52 do {
53 state = gpiod_get_value_cansleep(data->desc);
54 cond_resched();
55 state1 = gpiod_get_value_cansleep(data->desc);
56 } while (state != state1);
57
58 if (test_bit(col, data->last_state) != state) {
59 int code = MATRIX_SCAN_CODE(row, col,
60 priv->row_shift);
61
62 if (state) {
63 set_bit(col, data->last_state);
64 input_event(dev->input, EV_MSC,
65 MSC_SCAN, code);
66 } else {
67 clear_bit(col, data->last_state);
68 }
69
70 if (keycodes[code])
71 input_report_key(dev->input,
72 keycodes[code], state);
73 sync = true;
74 }
75 }
76
77
78 regmap_update_bits(priv->syscon, SYSCON_OFFSET,
79 SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
80 }
81
82 if (sync)
83 input_sync(dev->input);
84}
85
86static int clps711x_keypad_probe(struct platform_device *pdev)
87{
88 struct clps711x_keypad_data *priv;
89 struct device *dev = &pdev->dev;
90 struct device_node *np = dev->of_node;
91 struct input_polled_dev *poll_dev;
92 u32 poll_interval;
93 int i, err;
94
95 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
96 if (!priv)
97 return -ENOMEM;
98
99 priv->syscon =
100 syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1");
101 if (IS_ERR(priv->syscon))
102 return PTR_ERR(priv->syscon);
103
104 priv->row_count = of_gpio_named_count(np, "row-gpios");
105 if (priv->row_count < 1)
106 return -EINVAL;
107
108 priv->gpio_data = devm_kcalloc(dev,
109 priv->row_count, sizeof(*priv->gpio_data),
110 GFP_KERNEL);
111 if (!priv->gpio_data)
112 return -ENOMEM;
113
114 priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
115
116 for (i = 0; i < priv->row_count; i++) {
117 struct clps711x_gpio_data *data = &priv->gpio_data[i];
118
119 data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
120 if (IS_ERR(data->desc))
121 return PTR_ERR(data->desc);
122 }
123
124 err = of_property_read_u32(np, "poll-interval", &poll_interval);
125 if (err)
126 return err;
127
128 poll_dev = input_allocate_polled_device();
129 if (!poll_dev)
130 return -ENOMEM;
131
132 poll_dev->private = priv;
133 poll_dev->poll = clps711x_keypad_poll;
134 poll_dev->poll_interval = poll_interval;
135 poll_dev->input->name = pdev->name;
136 poll_dev->input->dev.parent = dev;
137 poll_dev->input->id.bustype = BUS_HOST;
138 poll_dev->input->id.vendor = 0x0001;
139 poll_dev->input->id.product = 0x0001;
140 poll_dev->input->id.version = 0x0100;
141
142 err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
143 CLPS711X_KEYPAD_COL_COUNT,
144 NULL, poll_dev->input);
145 if (err)
146 goto out_err;
147
148 input_set_capability(poll_dev->input, EV_MSC, MSC_SCAN);
149 if (of_property_read_bool(np, "autorepeat"))
150 __set_bit(EV_REP, poll_dev->input->evbit);
151
152 platform_set_drvdata(pdev, poll_dev);
153
154
155 regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
156 SYSCON1_KBDSCAN(1));
157
158 err = input_register_polled_device(poll_dev);
159 if (err)
160 goto out_err;
161
162 return 0;
163
164out_err:
165 input_free_polled_device(poll_dev);
166 return err;
167}
168
169static int clps711x_keypad_remove(struct platform_device *pdev)
170{
171 struct input_polled_dev *poll_dev = platform_get_drvdata(pdev);
172
173 input_unregister_polled_device(poll_dev);
174 input_free_polled_device(poll_dev);
175
176 return 0;
177}
178
179static const struct of_device_id clps711x_keypad_of_match[] = {
180 { .compatible = "cirrus,ep7209-keypad", },
181 { }
182};
183MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
184
185static struct platform_driver clps711x_keypad_driver = {
186 .driver = {
187 .name = "clps711x-keypad",
188 .of_match_table = clps711x_keypad_of_match,
189 },
190 .probe = clps711x_keypad_probe,
191 .remove = clps711x_keypad_remove,
192};
193module_platform_driver(clps711x_keypad_driver);
194
195MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
196MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
197MODULE_LICENSE("GPL");
198
