]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/input/keyboard/clps711x-keypad.c
Merge tag 'xtensa-20170507' of git://github.com/jcmvbkbc/linux-xtensa
[karo-tx-linux.git] / drivers / input / keyboard / clps711x-keypad.c
1 /*
2  * Cirrus Logic CLPS711X Keypad driver
3  *
4  * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11
12 #include <linux/input.h>
13 #include <linux/input-polldev.h>
14 #include <linux/module.h>
15 #include <linux/of_gpio.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/sched.h>
19 #include <linux/input/matrix_keypad.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/mfd/syscon/clps711x.h>
22
23 #define CLPS711X_KEYPAD_COL_COUNT       8
24
25 struct clps711x_gpio_data {
26         struct gpio_desc *desc;
27         DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
28 };
29
30 struct clps711x_keypad_data {
31         struct regmap                   *syscon;
32         int                             row_count;
33         unsigned int                    row_shift;
34         struct clps711x_gpio_data       *gpio_data;
35 };
36
37 static void clps711x_keypad_poll(struct input_polled_dev *dev)
38 {
39         const unsigned short *keycodes = dev->input->keycode;
40         struct clps711x_keypad_data *priv = dev->private;
41         bool sync = false;
42         int col, row;
43
44         for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
45                 /* Assert column */
46                 regmap_update_bits(priv->syscon, SYSCON_OFFSET,
47                                    SYSCON1_KBDSCAN_MASK,
48                                    SYSCON1_KBDSCAN(8 + col));
49
50                 /* Scan rows */
51                 for (row = 0; row < priv->row_count; row++) {
52                         struct clps711x_gpio_data *data = &priv->gpio_data[row];
53                         bool state, state1;
54
55                         /* Read twice for protection against fluctuations */
56                         do {
57                                 state = gpiod_get_value_cansleep(data->desc);
58                                 cond_resched();
59                                 state1 = gpiod_get_value_cansleep(data->desc);
60                         } while (state != state1);
61
62                         if (test_bit(col, data->last_state) != state) {
63                                 int code = MATRIX_SCAN_CODE(row, col,
64                                                             priv->row_shift);
65
66                                 if (state) {
67                                         set_bit(col, data->last_state);
68                                         input_event(dev->input, EV_MSC,
69                                                     MSC_SCAN, code);
70                                 } else {
71                                         clear_bit(col, data->last_state);
72                                 }
73
74                                 if (keycodes[code])
75                                         input_report_key(dev->input,
76                                                          keycodes[code], state);
77                                 sync = true;
78                         }
79                 }
80
81                 /* Set all columns to low */
82                 regmap_update_bits(priv->syscon, SYSCON_OFFSET,
83                                    SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
84         }
85
86         if (sync)
87                 input_sync(dev->input);
88 }
89
90 static int clps711x_keypad_probe(struct platform_device *pdev)
91 {
92         struct clps711x_keypad_data *priv;
93         struct device *dev = &pdev->dev;
94         struct device_node *np = dev->of_node;
95         struct input_polled_dev *poll_dev;
96         u32 poll_interval;
97         int i, err;
98
99         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
100         if (!priv)
101                 return -ENOMEM;
102
103         priv->syscon =
104                 syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1");
105         if (IS_ERR(priv->syscon))
106                 return PTR_ERR(priv->syscon);
107
108         priv->row_count = of_gpio_named_count(np, "row-gpios");
109         if (priv->row_count < 1)
110                 return -EINVAL;
111
112         priv->gpio_data = devm_kzalloc(dev,
113                                 sizeof(*priv->gpio_data) * priv->row_count,
114                                 GFP_KERNEL);
115         if (!priv->gpio_data)
116                 return -ENOMEM;
117
118         priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
119
120         for (i = 0; i < priv->row_count; i++) {
121                 struct clps711x_gpio_data *data = &priv->gpio_data[i];
122
123                 data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
124                 if (IS_ERR(data->desc))
125                         return PTR_ERR(data->desc);
126         }
127
128         err = of_property_read_u32(np, "poll-interval", &poll_interval);
129         if (err)
130                 return err;
131
132         poll_dev = input_allocate_polled_device();
133         if (!poll_dev)
134                 return -ENOMEM;
135
136         poll_dev->private               = priv;
137         poll_dev->poll                  = clps711x_keypad_poll;
138         poll_dev->poll_interval         = poll_interval;
139         poll_dev->input->name           = pdev->name;
140         poll_dev->input->dev.parent     = dev;
141         poll_dev->input->id.bustype     = BUS_HOST;
142         poll_dev->input->id.vendor      = 0x0001;
143         poll_dev->input->id.product     = 0x0001;
144         poll_dev->input->id.version     = 0x0100;
145
146         err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
147                                          CLPS711X_KEYPAD_COL_COUNT,
148                                          NULL, poll_dev->input);
149         if (err)
150                 goto out_err;
151
152         input_set_capability(poll_dev->input, EV_MSC, MSC_SCAN);
153         if (of_property_read_bool(np, "autorepeat"))
154                 __set_bit(EV_REP, poll_dev->input->evbit);
155
156         platform_set_drvdata(pdev, poll_dev);
157
158         /* Set all columns to low */
159         regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
160                            SYSCON1_KBDSCAN(1));
161
162         err = input_register_polled_device(poll_dev);
163         if (err)
164                 goto out_err;
165
166         return 0;
167
168 out_err:
169         input_free_polled_device(poll_dev);
170         return err;
171 }
172
173 static int clps711x_keypad_remove(struct platform_device *pdev)
174 {
175         struct input_polled_dev *poll_dev = platform_get_drvdata(pdev);
176
177         input_unregister_polled_device(poll_dev);
178         input_free_polled_device(poll_dev);
179
180         return 0;
181 }
182
183 static const struct of_device_id clps711x_keypad_of_match[] = {
184         { .compatible = "cirrus,ep7209-keypad", },
185         { }
186 };
187 MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
188
189 static struct platform_driver clps711x_keypad_driver = {
190         .driver = {
191                 .name           = "clps711x-keypad",
192                 .of_match_table = clps711x_keypad_of_match,
193         },
194         .probe  = clps711x_keypad_probe,
195         .remove = clps711x_keypad_remove,
196 };
197 module_platform_driver(clps711x_keypad_driver);
198
199 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
200 MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
201 MODULE_LICENSE("GPL");