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dd4cae8b CG |
1 | /* |
2 | * Microchip 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/module.h> | |
10 | #include <linux/input.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/interrupt.h> | |
15 | ||
16 | #define AR1021_TOCUH_PKG_SIZE 5 | |
17 | ||
18 | #define AR1021_MAX_X 4095 | |
19 | #define AR1021_MAX_Y 4095 | |
20 | ||
21 | struct ar1021_i2c { | |
22 | struct i2c_client *client; | |
23 | struct input_dev *input; | |
24 | u8 data[AR1021_TOCUH_PKG_SIZE]; | |
25 | }; | |
26 | ||
27 | static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id) | |
28 | { | |
29 | struct ar1021_i2c *ar1021 = dev_id; | |
30 | struct input_dev *input = ar1021->input; | |
31 | u8 *data = ar1021->data; | |
32 | unsigned int x, y, button; | |
33 | int retval; | |
34 | ||
35 | retval = i2c_master_recv(ar1021->client, | |
36 | ar1021->data, sizeof(ar1021->data)); | |
37 | if (retval != sizeof(ar1021->data)) | |
38 | goto out; | |
39 | ||
40 | /* sync bit set ? */ | |
41 | if ((data[0] & 0x80) == 0) | |
42 | goto out; | |
43 | ||
44 | button = data[0] & BIT(0); | |
45 | x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f); | |
46 | y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f); | |
47 | ||
48 | input_report_abs(input, ABS_X, x); | |
49 | input_report_abs(input, ABS_Y, y); | |
50 | input_report_key(input, BTN_TOUCH, button); | |
51 | input_sync(input); | |
52 | ||
53 | out: | |
54 | return IRQ_HANDLED; | |
55 | } | |
56 | ||
57 | static int ar1021_i2c_open(struct input_dev *dev) | |
58 | { | |
59 | struct ar1021_i2c *ar1021 = input_get_drvdata(dev); | |
60 | struct i2c_client *client = ar1021->client; | |
61 | ||
62 | enable_irq(client->irq); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static void ar1021_i2c_close(struct input_dev *dev) | |
68 | { | |
69 | struct ar1021_i2c *ar1021 = input_get_drvdata(dev); | |
70 | struct i2c_client *client = ar1021->client; | |
71 | ||
72 | disable_irq(client->irq); | |
73 | } | |
74 | ||
75 | static int ar1021_i2c_probe(struct i2c_client *client, | |
76 | const struct i2c_device_id *id) | |
77 | { | |
78 | struct ar1021_i2c *ar1021; | |
79 | struct input_dev *input; | |
80 | int error; | |
81 | ||
82 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
83 | dev_err(&client->dev, "i2c_check_functionality error\n"); | |
84 | return -ENXIO; | |
85 | } | |
86 | ||
87 | ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL); | |
88 | if (!ar1021) | |
89 | return -ENOMEM; | |
90 | ||
91 | input = devm_input_allocate_device(&client->dev); | |
92 | if (!input) | |
93 | return -ENOMEM; | |
94 | ||
95 | ar1021->client = client; | |
96 | ar1021->input = input; | |
97 | ||
98 | input->name = "ar1021 I2C Touchscreen"; | |
99 | input->id.bustype = BUS_I2C; | |
100 | input->dev.parent = &client->dev; | |
101 | input->open = ar1021_i2c_open; | |
102 | input->close = ar1021_i2c_close; | |
103 | ||
104 | input_set_capability(input, EV_KEY, BTN_TOUCH); | |
105 | input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0); | |
106 | input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0); | |
107 | ||
108 | input_set_drvdata(input, ar1021); | |
109 | ||
110 | error = devm_request_threaded_irq(&client->dev, client->irq, | |
111 | NULL, ar1021_i2c_irq, | |
112 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
113 | "ar1021_i2c", ar1021); | |
114 | if (error) { | |
115 | dev_err(&client->dev, | |
116 | "Failed to enable IRQ, error: %d\n", error); | |
117 | return error; | |
118 | } | |
119 | ||
120 | /* Disable the IRQ, we'll enable it in ar1021_i2c_open() */ | |
121 | disable_irq(client->irq); | |
122 | ||
123 | error = input_register_device(ar1021->input); | |
124 | if (error) { | |
125 | dev_err(&client->dev, | |
126 | "Failed to register input device, error: %d\n", error); | |
127 | return error; | |
128 | } | |
129 | ||
130 | i2c_set_clientdata(client, ar1021); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int __maybe_unused ar1021_i2c_suspend(struct device *dev) | |
135 | { | |
136 | struct i2c_client *client = to_i2c_client(dev); | |
137 | ||
138 | disable_irq(client->irq); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int __maybe_unused ar1021_i2c_resume(struct device *dev) | |
144 | { | |
145 | struct i2c_client *client = to_i2c_client(dev); | |
146 | ||
147 | enable_irq(client->irq); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume); | |
153 | ||
154 | static const struct i2c_device_id ar1021_i2c_id[] = { | |
155 | { "MICROCHIP_AR1021_I2C", 0 }, | |
156 | { }, | |
157 | }; | |
158 | MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id); | |
159 | ||
245165de | 160 | static const struct of_device_id ar1021_i2c_of_match[] = { |
dd4cae8b CG |
161 | { .compatible = "microchip,ar1021-i2c", }, |
162 | { } | |
163 | }; | |
164 | MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match); | |
165 | ||
166 | static struct i2c_driver ar1021_i2c_driver = { | |
167 | .driver = { | |
168 | .name = "ar1021_i2c", | |
dd4cae8b CG |
169 | .pm = &ar1021_i2c_pm, |
170 | .of_match_table = ar1021_i2c_of_match, | |
171 | }, | |
172 | ||
173 | .probe = ar1021_i2c_probe, | |
174 | .id_table = ar1021_i2c_id, | |
175 | }; | |
176 | module_i2c_driver(ar1021_i2c_driver); | |
177 | ||
178 | MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>"); | |
179 | MODULE_DESCRIPTION("Microchip AR1021 I2C Driver"); | |
180 | MODULE_LICENSE("GPL"); |