Input: ar1021_i2c - set INPUT_PROP_DIRECT
[sfrench/cifs-2.6.git] / drivers / input / touchscreen / ar1021_i2c.c
1 /*
2  * Microchip AR1020 and AR1021 driver for I2C
3  *
4  * Author: Christian Gmeiner <christian.gmeiner@gmail.com>
5  *
6  * License: GPLv2 as published by the FSF.
7  */
8
9 #include <linux/bitops.h>
10 #include <linux/module.h>
11 #include <linux/input.h>
12 #include <linux/of.h>
13 #include <linux/i2c.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16
17 #define AR1021_TOCUH_PKG_SIZE   5
18
19 #define AR1021_MAX_X    4095
20 #define AR1021_MAX_Y    4095
21
22 #define AR1021_CMD      0x55
23
24 #define AR1021_CMD_ENABLE_TOUCH         0x12
25
26 struct ar1021_i2c {
27         struct i2c_client *client;
28         struct input_dev *input;
29         u8 data[AR1021_TOCUH_PKG_SIZE];
30 };
31
32 static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)
33 {
34         struct ar1021_i2c *ar1021 = dev_id;
35         struct input_dev *input = ar1021->input;
36         u8 *data = ar1021->data;
37         unsigned int x, y, button;
38         int retval;
39
40         retval = i2c_master_recv(ar1021->client,
41                                  ar1021->data, sizeof(ar1021->data));
42         if (retval != sizeof(ar1021->data))
43                 goto out;
44
45         /* sync bit set ? */
46         if (!(data[0] & BIT(7)))
47                 goto out;
48
49         button = data[0] & BIT(0);
50         x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f);
51         y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f);
52
53         input_report_abs(input, ABS_X, x);
54         input_report_abs(input, ABS_Y, y);
55         input_report_key(input, BTN_TOUCH, button);
56         input_sync(input);
57
58 out:
59         return IRQ_HANDLED;
60 }
61
62 static int ar1021_i2c_open(struct input_dev *dev)
63 {
64         static const u8 cmd_enable_touch[] = {
65                 AR1021_CMD,
66                 0x01, /* number of bytes after this */
67                 AR1021_CMD_ENABLE_TOUCH
68         };
69         struct ar1021_i2c *ar1021 = input_get_drvdata(dev);
70         struct i2c_client *client = ar1021->client;
71         int error;
72
73         error = i2c_master_send(ar1021->client, cmd_enable_touch,
74                                 sizeof(cmd_enable_touch));
75         if (error < 0)
76                 return error;
77
78         enable_irq(client->irq);
79
80         return 0;
81 }
82
83 static void ar1021_i2c_close(struct input_dev *dev)
84 {
85         struct ar1021_i2c *ar1021 = input_get_drvdata(dev);
86         struct i2c_client *client = ar1021->client;
87
88         disable_irq(client->irq);
89 }
90
91 static int ar1021_i2c_probe(struct i2c_client *client,
92                             const struct i2c_device_id *id)
93 {
94         struct ar1021_i2c *ar1021;
95         struct input_dev *input;
96         int error;
97
98         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
99                 dev_err(&client->dev, "i2c_check_functionality error\n");
100                 return -ENXIO;
101         }
102
103         ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL);
104         if (!ar1021)
105                 return -ENOMEM;
106
107         input = devm_input_allocate_device(&client->dev);
108         if (!input)
109                 return -ENOMEM;
110
111         ar1021->client = client;
112         ar1021->input = input;
113
114         input->name = "ar1021 I2C Touchscreen";
115         input->id.bustype = BUS_I2C;
116         input->dev.parent = &client->dev;
117         input->open = ar1021_i2c_open;
118         input->close = ar1021_i2c_close;
119
120         __set_bit(INPUT_PROP_DIRECT, input->propbit);
121         input_set_capability(input, EV_KEY, BTN_TOUCH);
122         input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0);
123         input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0);
124
125         input_set_drvdata(input, ar1021);
126
127         error = devm_request_threaded_irq(&client->dev, client->irq,
128                                           NULL, ar1021_i2c_irq,
129                                           IRQF_ONESHOT,
130                                           "ar1021_i2c", ar1021);
131         if (error) {
132                 dev_err(&client->dev,
133                         "Failed to enable IRQ, error: %d\n", error);
134                 return error;
135         }
136
137         /* Disable the IRQ, we'll enable it in ar1021_i2c_open() */
138         disable_irq(client->irq);
139
140         error = input_register_device(ar1021->input);
141         if (error) {
142                 dev_err(&client->dev,
143                         "Failed to register input device, error: %d\n", error);
144                 return error;
145         }
146
147         return 0;
148 }
149
150 static int __maybe_unused ar1021_i2c_suspend(struct device *dev)
151 {
152         struct i2c_client *client = to_i2c_client(dev);
153
154         disable_irq(client->irq);
155
156         return 0;
157 }
158
159 static int __maybe_unused ar1021_i2c_resume(struct device *dev)
160 {
161         struct i2c_client *client = to_i2c_client(dev);
162
163         enable_irq(client->irq);
164
165         return 0;
166 }
167
168 static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume);
169
170 static const struct i2c_device_id ar1021_i2c_id[] = {
171         { "ar1021", 0 },
172         { },
173 };
174 MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id);
175
176 static const struct of_device_id ar1021_i2c_of_match[] = {
177         { .compatible = "microchip,ar1021-i2c", },
178         { }
179 };
180 MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match);
181
182 static struct i2c_driver ar1021_i2c_driver = {
183         .driver = {
184                 .name   = "ar1021_i2c",
185                 .pm     = &ar1021_i2c_pm,
186                 .of_match_table = ar1021_i2c_of_match,
187         },
188
189         .probe          = ar1021_i2c_probe,
190         .id_table       = ar1021_i2c_id,
191 };
192 module_i2c_driver(ar1021_i2c_driver);
193
194 MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
195 MODULE_DESCRIPTION("Microchip AR1020 and AR1021 I2C Driver");
196 MODULE_LICENSE("GPL");