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885c316d MD |
1 | /* |
2 | * Touch Screen driver for Renesas MIGO-R Platform | |
3 | * | |
4 | * Copyright (c) 2008 Magnus Damm | |
5 | * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>, | |
6 | * Kenati Technologies Pvt Ltd. | |
7 | * | |
8 | * This file is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * This file is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/interrupt.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
885c316d MD |
27 | #include <asm/io.h> |
28 | #include <linux/i2c.h> | |
29 | #include <linux/timer.h> | |
30 | ||
31 | #define EVENT_PENDOWN 1 | |
32 | #define EVENT_REPEAT 2 | |
33 | #define EVENT_PENUP 3 | |
34 | ||
35 | struct migor_ts_priv { | |
36 | struct i2c_client *client; | |
37 | struct input_dev *input; | |
38 | struct delayed_work work; | |
39 | int irq; | |
40 | }; | |
41 | ||
42 | static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11, | |
43 | 0x01, 0x06, 0x07, }; | |
44 | static const u_int8_t migor_ts_dis_seq[17] = { }; | |
45 | ||
46 | static void migor_ts_poscheck(struct work_struct *work) | |
47 | { | |
48 | struct migor_ts_priv *priv = container_of(work, | |
49 | struct migor_ts_priv, | |
50 | work.work); | |
51 | unsigned short xpos, ypos; | |
52 | unsigned char event; | |
53 | u_int8_t buf[16]; | |
54 | ||
55 | memset(buf, 0, sizeof(buf)); | |
56 | ||
57 | /* Set Index 0 */ | |
58 | buf[0] = 0; | |
59 | if (i2c_master_send(priv->client, buf, 1) != 1) { | |
60 | dev_err(&priv->client->dev, "Unable to write i2c index\n"); | |
61 | goto out; | |
62 | } | |
63 | ||
64 | /* Now do Page Read */ | |
65 | if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) { | |
66 | dev_err(&priv->client->dev, "Unable to read i2c page\n"); | |
67 | goto out; | |
68 | } | |
69 | ||
70 | ypos = ((buf[9] & 0x03) << 8 | buf[8]); | |
71 | xpos = ((buf[11] & 0x03) << 8 | buf[10]); | |
72 | event = buf[12]; | |
73 | ||
74 | if (event == EVENT_PENDOWN || event == EVENT_REPEAT) { | |
75 | input_report_key(priv->input, BTN_TOUCH, 1); | |
76 | input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/ | |
77 | input_report_abs(priv->input, ABS_Y, xpos); | |
78 | input_sync(priv->input); | |
79 | } else if (event == EVENT_PENUP) { | |
80 | input_report_key(priv->input, BTN_TOUCH, 0); | |
81 | input_sync(priv->input); | |
82 | } | |
83 | out: | |
84 | enable_irq(priv->irq); | |
85 | } | |
86 | ||
87 | static irqreturn_t migor_ts_isr(int irq, void *dev_id) | |
88 | { | |
89 | struct migor_ts_priv *priv = dev_id; | |
90 | ||
91 | /* the touch screen controller chip is hooked up to the cpu | |
92 | * using i2c and a single interrupt line. the interrupt line | |
93 | * is pulled low whenever someone taps the screen. to deassert | |
94 | * the interrupt line we need to acknowledge the interrupt by | |
95 | * communicating with the controller over the slow i2c bus. | |
96 | * | |
97 | * we can't acknowledge from interrupt context since the i2c | |
98 | * bus controller may sleep, so we just disable the interrupt | |
99 | * here and handle the acknowledge using delayed work. | |
100 | */ | |
101 | ||
102 | disable_irq_nosync(irq); | |
103 | schedule_delayed_work(&priv->work, HZ / 20); | |
104 | ||
105 | return IRQ_HANDLED; | |
106 | } | |
107 | ||
108 | ||
109 | static int migor_ts_open(struct input_dev *dev) | |
110 | { | |
111 | struct migor_ts_priv *priv = input_get_drvdata(dev); | |
112 | struct i2c_client *client = priv->client; | |
113 | int count; | |
114 | ||
115 | /* enable controller */ | |
116 | count = i2c_master_send(client, migor_ts_ena_seq, | |
117 | sizeof(migor_ts_ena_seq)); | |
118 | if (count != sizeof(migor_ts_ena_seq)) { | |
119 | dev_err(&client->dev, "Unable to enable touchscreen.\n"); | |
120 | return -ENXIO; | |
121 | } | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static void migor_ts_close(struct input_dev *dev) | |
127 | { | |
128 | struct migor_ts_priv *priv = input_get_drvdata(dev); | |
129 | struct i2c_client *client = priv->client; | |
130 | ||
131 | disable_irq(priv->irq); | |
132 | ||
133 | /* cancel pending work and wait for migor_ts_poscheck() to finish */ | |
134 | if (cancel_delayed_work_sync(&priv->work)) { | |
135 | /* | |
136 | * if migor_ts_poscheck was canceled we need to enable IRQ | |
137 | * here to balance disable done in migor_ts_isr. | |
138 | */ | |
139 | enable_irq(priv->irq); | |
140 | } | |
141 | ||
142 | /* disable controller */ | |
143 | i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq)); | |
144 | ||
145 | enable_irq(priv->irq); | |
146 | } | |
147 | ||
148 | static int migor_ts_probe(struct i2c_client *client, | |
149 | const struct i2c_device_id *idp) | |
150 | { | |
151 | struct migor_ts_priv *priv; | |
152 | struct input_dev *input; | |
153 | int error; | |
154 | ||
155 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
156 | if (!priv) { | |
157 | dev_err(&client->dev, "failed to allocate driver data\n"); | |
158 | error = -ENOMEM; | |
159 | goto err0; | |
160 | } | |
161 | ||
162 | dev_set_drvdata(&client->dev, priv); | |
163 | ||
164 | input = input_allocate_device(); | |
165 | if (!input) { | |
166 | dev_err(&client->dev, "Failed to allocate input device.\n"); | |
167 | error = -ENOMEM; | |
168 | goto err1; | |
169 | } | |
170 | ||
171 | input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
172 | input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
173 | ||
174 | input_set_abs_params(input, ABS_X, 95, 955, 0, 0); | |
175 | input_set_abs_params(input, ABS_Y, 85, 935, 0, 0); | |
176 | ||
b6ce9ad0 | 177 | input->name = client->name; |
885c316d MD |
178 | input->id.bustype = BUS_I2C; |
179 | input->dev.parent = &client->dev; | |
180 | ||
181 | input->open = migor_ts_open; | |
182 | input->close = migor_ts_close; | |
183 | ||
184 | input_set_drvdata(input, priv); | |
185 | ||
186 | priv->client = client; | |
187 | priv->input = input; | |
188 | INIT_DELAYED_WORK(&priv->work, migor_ts_poscheck); | |
189 | priv->irq = client->irq; | |
190 | ||
191 | error = input_register_device(input); | |
192 | if (error) | |
193 | goto err1; | |
194 | ||
195 | error = request_irq(priv->irq, migor_ts_isr, IRQF_TRIGGER_LOW, | |
b6ce9ad0 | 196 | client->name, priv); |
885c316d MD |
197 | if (error) { |
198 | dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); | |
199 | goto err2; | |
200 | } | |
201 | ||
0935ade0 | 202 | device_init_wakeup(&client->dev, 1); |
885c316d MD |
203 | return 0; |
204 | ||
205 | err2: | |
206 | input_unregister_device(input); | |
207 | input = NULL; /* so we dont try to free it below */ | |
208 | err1: | |
209 | input_free_device(input); | |
210 | kfree(priv); | |
211 | err0: | |
212 | dev_set_drvdata(&client->dev, NULL); | |
213 | return error; | |
214 | } | |
215 | ||
216 | static int migor_ts_remove(struct i2c_client *client) | |
217 | { | |
218 | struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); | |
219 | ||
220 | free_irq(priv->irq, priv); | |
221 | input_unregister_device(priv->input); | |
222 | kfree(priv); | |
223 | ||
224 | dev_set_drvdata(&client->dev, NULL); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
0935ade0 MD |
229 | static int migor_ts_suspend(struct i2c_client *client, pm_message_t mesg) |
230 | { | |
231 | struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); | |
232 | ||
233 | if (device_may_wakeup(&client->dev)) | |
234 | enable_irq_wake(priv->irq); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int migor_ts_resume(struct i2c_client *client) | |
240 | { | |
241 | struct migor_ts_priv *priv = dev_get_drvdata(&client->dev); | |
242 | ||
243 | if (device_may_wakeup(&client->dev)) | |
244 | disable_irq_wake(priv->irq); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
b6ce9ad0 MD |
249 | static const struct i2c_device_id migor_ts_id[] = { |
250 | { "migor_ts", 0 }, | |
251 | { } | |
252 | }; | |
253 | MODULE_DEVICE_TABLE(i2c, migor_ts); | |
254 | ||
885c316d MD |
255 | static struct i2c_driver migor_ts_driver = { |
256 | .driver = { | |
257 | .name = "migor_ts", | |
258 | }, | |
259 | .probe = migor_ts_probe, | |
260 | .remove = migor_ts_remove, | |
0935ade0 MD |
261 | .suspend = migor_ts_suspend, |
262 | .resume = migor_ts_resume, | |
b6ce9ad0 | 263 | .id_table = migor_ts_id, |
885c316d MD |
264 | }; |
265 | ||
266 | static int __init migor_ts_init(void) | |
267 | { | |
268 | return i2c_add_driver(&migor_ts_driver); | |
269 | } | |
270 | ||
271 | static void __exit migor_ts_exit(void) | |
272 | { | |
273 | i2c_del_driver(&migor_ts_driver); | |
274 | } | |
275 | ||
276 | MODULE_DESCRIPTION("MigoR Touchscreen driver"); | |
277 | MODULE_AUTHOR("Magnus Damm <damm@opensource.se>"); | |
278 | MODULE_LICENSE("GPL"); | |
279 | ||
280 | module_init(migor_ts_init); | |
281 | module_exit(migor_ts_exit); |