Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/input/touchscreen/st1232.c

  1 /*
  2  * ST1232 Touchscreen Controller Driver
  3  *
  4  * Copyright (C) 2010 Renesas Solutions Corp.
  5  *      Tony SIM <chinyeow.sim.xt@renesas.com>
  6  *
  7  * Using code from:
  8  *  - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
  9  *      Copyright (C) 2007 Google, Inc.
 10  *
 11  * This software is licensed under the terms of the GNU General Public
 12  * License version 2, as published by the Free Software Foundation, and
 13  * may be copied, distributed, and modified under those terms.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  */
 20 
 21 #include <linux/delay.h>
 22 #include <linux/gpio.h>
 23 #include <linux/i2c.h>
 24 #include <linux/input.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/module.h>
 27 #include <linux/of.h>
 28 #include <linux/of_gpio.h>
 29 #include <linux/pm_qos.h>
 30 #include <linux/slab.h>
 31 #include <linux/types.h>
 32 #include <linux/platform_data/st1232_pdata.h>
 33 
 34 #define ST1232_TS_NAME  "st1232-ts"
 35 
 36 #define MIN_X           0x00
 37 #define MIN_Y           0x00
 38 #define MAX_X           0x31f   /* (800 - 1) */
 39 #define MAX_Y           0x1df   /* (480 - 1) */
 40 #define MAX_AREA        0xff
 41 #define MAX_FINGERS     2
 42 
 43 struct st1232_ts_finger {
 44         u16 x;
 45         u16 y;
 46         u8 t;
 47         bool is_valid;
 48 };
 49 
 50 struct st1232_ts_data {
 51         struct i2c_client *client;
 52         struct input_dev *input_dev;
 53         struct st1232_ts_finger finger[MAX_FINGERS];
 54         struct dev_pm_qos_request low_latency_req;
 55         int reset_gpio;
 56 };
 57 
 58 static int st1232_ts_read_data(struct st1232_ts_data *ts)
 59 {
 60         struct st1232_ts_finger *finger = ts->finger;
 61         struct i2c_client *client = ts->client;
 62         struct i2c_msg msg[2];
 63         int error;
 64         u8 start_reg;
 65         u8 buf[10];
 66 
 67         /* read touchscreen data from ST1232 */
 68         msg[0].addr = client->addr;
 69         msg[0].flags = 0;
 70         msg[0].len = 1;
 71         msg[0].buf = &start_reg;
 72         start_reg = 0x10;
 73 
 74         msg[1].addr = ts->client->addr;
 75         msg[1].flags = I2C_M_RD;
 76         msg[1].len = sizeof(buf);
 77         msg[1].buf = buf;
 78 
 79         error = i2c_transfer(client->adapter, msg, 2);
 80         if (error < 0)
 81                 return error;
 82 
 83         /* get "valid" bits */
 84         finger[0].is_valid = buf[2] >> 7;
 85         finger[1].is_valid = buf[5] >> 7;
 86 
 87         /* get xy coordinate */
 88         if (finger[0].is_valid) {
 89                 finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
 90                 finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
 91                 finger[0].t = buf[8];
 92         }
 93 
 94         if (finger[1].is_valid) {
 95                 finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
 96                 finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
 97                 finger[1].t = buf[9];
 98         }
 99 
100         return 0;
101 }
102 
103 static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
104 {
105         struct st1232_ts_data *ts = dev_id;
106         struct st1232_ts_finger *finger = ts->finger;
107         struct input_dev *input_dev = ts->input_dev;
108         int count = 0;
109         int i, ret;
110 
111         ret = st1232_ts_read_data(ts);
112         if (ret < 0)
113                 goto end;
114 
115         /* multi touch protocol */
116         for (i = 0; i < MAX_FINGERS; i++) {
117                 if (!finger[i].is_valid)
118                         continue;
119 
120                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
121                 input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
122                 input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
123                 input_mt_sync(input_dev);
124                 count++;
125         }
126 
127         /* SYN_MT_REPORT only if no contact */
128         if (!count) {
129                 input_mt_sync(input_dev);
130                 if (ts->low_latency_req.dev) {
131                         dev_pm_qos_remove_request(&ts->low_latency_req);
132                         ts->low_latency_req.dev = NULL;
133                 }
134         } else if (!ts->low_latency_req.dev) {
135                 /* First contact, request 100 us latency. */
136                 dev_pm_qos_add_ancestor_request(&ts->client->dev,
137                                                 &ts->low_latency_req,
138                                                 DEV_PM_QOS_RESUME_LATENCY, 100);
139         }
140 
141         /* SYN_REPORT */
142         input_sync(input_dev);
143 
144 end:
145         return IRQ_HANDLED;
146 }
147 
148 static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
149 {
150         if (gpio_is_valid(ts->reset_gpio))
151                 gpio_direction_output(ts->reset_gpio, poweron);
152 }
153 
154 static int st1232_ts_probe(struct i2c_client *client,
155                                         const struct i2c_device_id *id)
156 {
157         struct st1232_ts_data *ts;
158         struct st1232_pdata *pdata = dev_get_platdata(&client->dev);
159         struct input_dev *input_dev;
160         int error;
161 
162         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
163                 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
164                 return -EIO;
165         }
166 
167         if (!client->irq) {
168                 dev_err(&client->dev, "no IRQ?\n");
169                 return -EINVAL;
170         }
171 
172         ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
173         if (!ts)
174                 return -ENOMEM;
175 
176         input_dev = devm_input_allocate_device(&client->dev);
177         if (!input_dev)
178                 return -ENOMEM;
179 
180         ts->client = client;
181         ts->input_dev = input_dev;
182 
183         if (pdata)
184                 ts->reset_gpio = pdata->reset_gpio;
185         else if (client->dev.of_node)
186                 ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
187         else
188                 ts->reset_gpio = -ENODEV;
189 
190         if (gpio_is_valid(ts->reset_gpio)) {
191                 error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
192                 if (error) {
193                         dev_err(&client->dev,
194                                 "Unable to request GPIO pin %d.\n",
195                                 ts->reset_gpio);
196                                 return error;
197                 }
198         }
199 
200         st1232_ts_power(ts, true);
201 
202         input_dev->name = "st1232-touchscreen";
203         input_dev->id.bustype = BUS_I2C;
204         input_dev->dev.parent = &client->dev;
205 
206         __set_bit(EV_SYN, input_dev->evbit);
207         __set_bit(EV_KEY, input_dev->evbit);
208         __set_bit(EV_ABS, input_dev->evbit);
209 
210         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
211         input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
212         input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
213 
214         error = devm_request_threaded_irq(&client->dev, client->irq,
215                                           NULL, st1232_ts_irq_handler,
216                                           IRQF_ONESHOT,
217                                           client->name, ts);
218         if (error) {
219                 dev_err(&client->dev, "Failed to register interrupt\n");
220                 return error;
221         }
222 
223         error = input_register_device(ts->input_dev);
224         if (error) {
225                 dev_err(&client->dev, "Unable to register %s input device\n",
226                         input_dev->name);
227                 return error;
228         }
229 
230         i2c_set_clientdata(client, ts);
231         device_init_wakeup(&client->dev, 1);
232 
233         return 0;
234 }
235 
236 static int st1232_ts_remove(struct i2c_client *client)
237 {
238         struct st1232_ts_data *ts = i2c_get_clientdata(client);
239 
240         device_init_wakeup(&client->dev, 0);
241         st1232_ts_power(ts, false);
242 
243         return 0;
244 }
245 
246 #ifdef CONFIG_PM_SLEEP
247 static int st1232_ts_suspend(struct device *dev)
248 {
249         struct i2c_client *client = to_i2c_client(dev);
250         struct st1232_ts_data *ts = i2c_get_clientdata(client);
251 
252         if (device_may_wakeup(&client->dev)) {
253                 enable_irq_wake(client->irq);
254         } else {
255                 disable_irq(client->irq);
256                 st1232_ts_power(ts, false);
257         }
258 
259         return 0;
260 }
261 
262 static int st1232_ts_resume(struct device *dev)
263 {
264         struct i2c_client *client = to_i2c_client(dev);
265         struct st1232_ts_data *ts = i2c_get_clientdata(client);
266 
267         if (device_may_wakeup(&client->dev)) {
268                 disable_irq_wake(client->irq);
269         } else {
270                 st1232_ts_power(ts, true);
271                 enable_irq(client->irq);
272         }
273 
274         return 0;
275 }
276 
277 #endif
278 
279 static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
280                          st1232_ts_suspend, st1232_ts_resume);
281 
282 static const struct i2c_device_id st1232_ts_id[] = {
283         { ST1232_TS_NAME, 0 },
284         { }
285 };
286 MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
287 
288 #ifdef CONFIG_OF
289 static const struct of_device_id st1232_ts_dt_ids[] = {
290         { .compatible = "sitronix,st1232", },
291         { }
292 };
293 MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
294 #endif
295 
296 static struct i2c_driver st1232_ts_driver = {
297         .probe          = st1232_ts_probe,
298         .remove         = st1232_ts_remove,
299         .id_table       = st1232_ts_id,
300         .driver = {
301                 .name   = ST1232_TS_NAME,
302                 .owner  = THIS_MODULE,
303                 .of_match_table = of_match_ptr(st1232_ts_dt_ids),
304                 .pm     = &st1232_ts_pm_ops,
305         },
306 };
307 
308 module_i2c_driver(st1232_ts_driver);
309 
310 MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
311 MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
312 MODULE_LICENSE("GPL");
313 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us