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36a281e2 JB |
1 | /* |
2 | * Driver for Pixcir I2C touchscreen controllers. | |
3 | * | |
4 | * Copyright (C) 2010-2011 Pixcir, Inc. | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/delay.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/input.h> | |
26 | #include <linux/input/pixcir_ts.h> | |
27 | ||
28 | struct pixcir_i2c_ts_data { | |
29 | struct i2c_client *client; | |
30 | struct input_dev *input; | |
31 | const struct pixcir_ts_platform_data *chip; | |
32 | bool exiting; | |
33 | }; | |
34 | ||
35 | static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data) | |
36 | { | |
37 | struct pixcir_i2c_ts_data *tsdata = data; | |
38 | u8 rdbuf[10], wrbuf[1] = { 0 }; | |
39 | u8 touch; | |
40 | int ret; | |
41 | ||
42 | ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf)); | |
43 | if (ret != sizeof(wrbuf)) { | |
44 | dev_err(&tsdata->client->dev, | |
45 | "%s: i2c_master_send failed(), ret=%d\n", | |
46 | __func__, ret); | |
47 | return; | |
48 | } | |
49 | ||
50 | ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf)); | |
51 | if (ret != sizeof(rdbuf)) { | |
52 | dev_err(&tsdata->client->dev, | |
53 | "%s: i2c_master_recv failed(), ret=%d\n", | |
54 | __func__, ret); | |
55 | return; | |
56 | } | |
57 | ||
58 | touch = rdbuf[0]; | |
59 | if (touch) { | |
60 | u16 posx1 = (rdbuf[3] << 8) | rdbuf[2]; | |
61 | u16 posy1 = (rdbuf[5] << 8) | rdbuf[4]; | |
62 | u16 posx2 = (rdbuf[7] << 8) | rdbuf[6]; | |
63 | u16 posy2 = (rdbuf[9] << 8) | rdbuf[8]; | |
64 | ||
65 | input_report_key(tsdata->input, BTN_TOUCH, 1); | |
66 | input_report_abs(tsdata->input, ABS_X, posx1); | |
67 | input_report_abs(tsdata->input, ABS_Y, posy1); | |
68 | ||
69 | input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1); | |
70 | input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1); | |
71 | input_mt_sync(tsdata->input); | |
72 | ||
73 | if (touch == 2) { | |
74 | input_report_abs(tsdata->input, | |
75 | ABS_MT_POSITION_X, posx2); | |
76 | input_report_abs(tsdata->input, | |
77 | ABS_MT_POSITION_Y, posy2); | |
78 | input_mt_sync(tsdata->input); | |
79 | } | |
80 | } else { | |
81 | input_report_key(tsdata->input, BTN_TOUCH, 0); | |
82 | } | |
83 | ||
84 | input_sync(tsdata->input); | |
85 | } | |
86 | ||
87 | static irqreturn_t pixcir_ts_isr(int irq, void *dev_id) | |
88 | { | |
89 | struct pixcir_i2c_ts_data *tsdata = dev_id; | |
90 | ||
91 | while (!tsdata->exiting) { | |
92 | pixcir_ts_poscheck(tsdata); | |
93 | ||
94 | if (tsdata->chip->attb_read_val()) | |
95 | break; | |
96 | ||
97 | msleep(20); | |
98 | } | |
99 | ||
100 | return IRQ_HANDLED; | |
101 | } | |
102 | ||
103 | #ifdef CONFIG_PM_SLEEP | |
104 | static int pixcir_i2c_ts_suspend(struct device *dev) | |
105 | { | |
106 | struct i2c_client *client = to_i2c_client(dev); | |
107 | ||
108 | if (device_may_wakeup(&client->dev)) | |
109 | enable_irq_wake(client->irq); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static int pixcir_i2c_ts_resume(struct device *dev) | |
115 | { | |
116 | struct i2c_client *client = to_i2c_client(dev); | |
117 | ||
118 | if (device_may_wakeup(&client->dev)) | |
119 | disable_irq_wake(client->irq); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | #endif | |
124 | ||
125 | static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops, | |
126 | pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume); | |
127 | ||
5298cc4c | 128 | static int pixcir_i2c_ts_probe(struct i2c_client *client, |
36a281e2 JB |
129 | const struct i2c_device_id *id) |
130 | { | |
131 | const struct pixcir_ts_platform_data *pdata = client->dev.platform_data; | |
132 | struct pixcir_i2c_ts_data *tsdata; | |
133 | struct input_dev *input; | |
134 | int error; | |
135 | ||
136 | if (!pdata) { | |
137 | dev_err(&client->dev, "platform data not defined\n"); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL); | |
142 | input = input_allocate_device(); | |
143 | if (!tsdata || !input) { | |
144 | dev_err(&client->dev, "Failed to allocate driver data!\n"); | |
145 | error = -ENOMEM; | |
146 | goto err_free_mem; | |
147 | } | |
148 | ||
149 | tsdata->client = client; | |
150 | tsdata->input = input; | |
151 | tsdata->chip = pdata; | |
152 | ||
153 | input->name = client->name; | |
154 | input->id.bustype = BUS_I2C; | |
155 | input->dev.parent = &client->dev; | |
156 | ||
157 | __set_bit(EV_KEY, input->evbit); | |
158 | __set_bit(EV_ABS, input->evbit); | |
159 | __set_bit(BTN_TOUCH, input->keybit); | |
160 | input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0); | |
161 | input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0); | |
162 | input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0); | |
163 | input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0); | |
164 | ||
165 | input_set_drvdata(input, tsdata); | |
166 | ||
167 | error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr, | |
9b7e31bb | 168 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
36a281e2 JB |
169 | client->name, tsdata); |
170 | if (error) { | |
171 | dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); | |
172 | goto err_free_mem; | |
173 | } | |
174 | ||
175 | error = input_register_device(input); | |
176 | if (error) | |
177 | goto err_free_irq; | |
178 | ||
179 | i2c_set_clientdata(client, tsdata); | |
180 | device_init_wakeup(&client->dev, 1); | |
181 | ||
182 | return 0; | |
183 | ||
184 | err_free_irq: | |
185 | free_irq(client->irq, tsdata); | |
186 | err_free_mem: | |
187 | input_free_device(input); | |
188 | kfree(tsdata); | |
189 | return error; | |
190 | } | |
191 | ||
e2619cf7 | 192 | static int pixcir_i2c_ts_remove(struct i2c_client *client) |
36a281e2 JB |
193 | { |
194 | struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client); | |
195 | ||
196 | device_init_wakeup(&client->dev, 0); | |
197 | ||
198 | tsdata->exiting = true; | |
199 | mb(); | |
200 | free_irq(client->irq, tsdata); | |
201 | ||
202 | input_unregister_device(tsdata->input); | |
203 | kfree(tsdata); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static const struct i2c_device_id pixcir_i2c_ts_id[] = { | |
209 | { "pixcir_ts", 0 }, | |
210 | { } | |
211 | }; | |
212 | MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id); | |
213 | ||
214 | static struct i2c_driver pixcir_i2c_ts_driver = { | |
215 | .driver = { | |
216 | .owner = THIS_MODULE, | |
217 | .name = "pixcir_ts", | |
218 | .pm = &pixcir_dev_pm_ops, | |
219 | }, | |
220 | .probe = pixcir_i2c_ts_probe, | |
1cb0aa88 | 221 | .remove = pixcir_i2c_ts_remove, |
36a281e2 JB |
222 | .id_table = pixcir_i2c_ts_id, |
223 | }; | |
224 | ||
4a533835 | 225 | module_i2c_driver(pixcir_i2c_ts_driver); |
36a281e2 JB |
226 | |
227 | MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>"); | |
228 | MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver"); | |
229 | MODULE_LICENSE("GPL"); |