2 * Driver for Pixcir I2C touchscreen controllers.
4 * Copyright (C) 2010-2011 Pixcir, Inc.
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.
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.
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
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>
28 struct pixcir_i2c_ts_data
{
29 struct i2c_client
*client
;
30 struct input_dev
*input
;
31 const struct pixcir_ts_platform_data
*chip
;
35 static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data
*data
)
37 struct pixcir_i2c_ts_data
*tsdata
= data
;
38 u8 rdbuf
[10], wrbuf
[1] = { 0 };
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",
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",
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];
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
);
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
);
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
);
81 input_report_key(tsdata
->input
, BTN_TOUCH
, 0);
84 input_sync(tsdata
->input
);
87 static irqreturn_t
pixcir_ts_isr(int irq
, void *dev_id
)
89 struct pixcir_i2c_ts_data
*tsdata
= dev_id
;
91 while (tsdata
->running
) {
92 pixcir_ts_poscheck(tsdata
);
94 if (tsdata
->chip
->attb_read_val())
103 static int pixcir_set_power_mode(struct pixcir_i2c_ts_data
*ts
,
104 enum pixcir_power_mode mode
)
106 struct device
*dev
= &ts
->client
->dev
;
109 ret
= i2c_smbus_read_byte_data(ts
->client
, PIXCIR_REG_POWER_MODE
);
111 dev_err(dev
, "%s: can't read reg 0x%x : %d\n",
112 __func__
, PIXCIR_REG_POWER_MODE
, ret
);
116 ret
&= ~PIXCIR_POWER_MODE_MASK
;
119 /* Always AUTO_IDLE */
120 ret
|= PIXCIR_POWER_ALLOW_IDLE
;
122 ret
= i2c_smbus_write_byte_data(ts
->client
, PIXCIR_REG_POWER_MODE
, ret
);
124 dev_err(dev
, "%s: can't write reg 0x%x : %d\n",
125 __func__
, PIXCIR_REG_POWER_MODE
, ret
);
133 * Set the interrupt mode for the device i.e. ATTB line behaviour
135 * @polarity : 1 for active high, 0 for active low.
137 static int pixcir_set_int_mode(struct pixcir_i2c_ts_data
*ts
,
138 enum pixcir_int_mode mode
, bool polarity
)
140 struct device
*dev
= &ts
->client
->dev
;
143 ret
= i2c_smbus_read_byte_data(ts
->client
, PIXCIR_REG_INT_MODE
);
145 dev_err(dev
, "%s: can't read reg 0x%x : %d\n",
146 __func__
, PIXCIR_REG_INT_MODE
, ret
);
150 ret
&= ~PIXCIR_INT_MODE_MASK
;
154 ret
|= PIXCIR_INT_POL_HIGH
;
156 ret
&= ~PIXCIR_INT_POL_HIGH
;
158 ret
= i2c_smbus_write_byte_data(ts
->client
, PIXCIR_REG_INT_MODE
, ret
);
160 dev_err(dev
, "%s: can't write reg 0x%x : %d\n",
161 __func__
, PIXCIR_REG_INT_MODE
, ret
);
169 * Enable/disable interrupt generation
171 static int pixcir_int_enable(struct pixcir_i2c_ts_data
*ts
, bool enable
)
173 struct device
*dev
= &ts
->client
->dev
;
176 ret
= i2c_smbus_read_byte_data(ts
->client
, PIXCIR_REG_INT_MODE
);
178 dev_err(dev
, "%s: can't read reg 0x%x : %d\n",
179 __func__
, PIXCIR_REG_INT_MODE
, ret
);
184 ret
|= PIXCIR_INT_ENABLE
;
186 ret
&= ~PIXCIR_INT_ENABLE
;
188 ret
= i2c_smbus_write_byte_data(ts
->client
, PIXCIR_REG_INT_MODE
, ret
);
190 dev_err(dev
, "%s: can't write reg 0x%x : %d\n",
191 __func__
, PIXCIR_REG_INT_MODE
, ret
);
198 static int pixcir_start(struct pixcir_i2c_ts_data
*ts
)
200 struct device
*dev
= &ts
->client
->dev
;
203 /* LEVEL_TOUCH interrupt with active low polarity */
204 error
= pixcir_set_int_mode(ts
, PIXCIR_INT_LEVEL_TOUCH
, 0);
206 dev_err(dev
, "Failed to set interrupt mode: %d\n", error
);
211 mb(); /* Update status before IRQ can fire */
213 /* enable interrupt generation */
214 error
= pixcir_int_enable(ts
, true);
216 dev_err(dev
, "Failed to enable interrupt generation: %d\n",
224 static int pixcir_stop(struct pixcir_i2c_ts_data
*ts
)
228 /* Disable interrupt generation */
229 error
= pixcir_int_enable(ts
, false);
231 dev_err(&ts
->client
->dev
,
232 "Failed to disable interrupt generation: %d\n",
237 /* Exit ISR if running, no more report parsing */
239 mb(); /* update status before we synchronize irq */
241 /* Wait till running ISR is complete */
242 synchronize_irq(ts
->client
->irq
);
247 static int pixcir_input_open(struct input_dev
*dev
)
249 struct pixcir_i2c_ts_data
*ts
= input_get_drvdata(dev
);
251 return pixcir_start(ts
);
254 static void pixcir_input_close(struct input_dev
*dev
)
256 struct pixcir_i2c_ts_data
*ts
= input_get_drvdata(dev
);
261 #ifdef CONFIG_PM_SLEEP
262 static int pixcir_i2c_ts_suspend(struct device
*dev
)
264 struct i2c_client
*client
= to_i2c_client(dev
);
266 if (device_may_wakeup(&client
->dev
))
267 enable_irq_wake(client
->irq
);
272 static int pixcir_i2c_ts_resume(struct device
*dev
)
274 struct i2c_client
*client
= to_i2c_client(dev
);
276 if (device_may_wakeup(&client
->dev
))
277 disable_irq_wake(client
->irq
);
283 static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops
,
284 pixcir_i2c_ts_suspend
, pixcir_i2c_ts_resume
);
286 static int pixcir_i2c_ts_probe(struct i2c_client
*client
,
287 const struct i2c_device_id
*id
)
289 const struct pixcir_ts_platform_data
*pdata
=
290 dev_get_platdata(&client
->dev
);
291 struct device
*dev
= &client
->dev
;
292 struct pixcir_i2c_ts_data
*tsdata
;
293 struct input_dev
*input
;
297 dev_err(&client
->dev
, "platform data not defined\n");
301 tsdata
= devm_kzalloc(dev
, sizeof(*tsdata
), GFP_KERNEL
);
305 input
= devm_input_allocate_device(dev
);
307 dev_err(dev
, "Failed to allocate input device\n");
311 tsdata
->client
= client
;
312 tsdata
->input
= input
;
313 tsdata
->chip
= pdata
;
315 input
->name
= client
->name
;
316 input
->id
.bustype
= BUS_I2C
;
317 input
->open
= pixcir_input_open
;
318 input
->close
= pixcir_input_close
;
319 input
->dev
.parent
= &client
->dev
;
321 __set_bit(EV_KEY
, input
->evbit
);
322 __set_bit(EV_ABS
, input
->evbit
);
323 __set_bit(BTN_TOUCH
, input
->keybit
);
324 input_set_abs_params(input
, ABS_X
, 0, pdata
->x_max
, 0, 0);
325 input_set_abs_params(input
, ABS_Y
, 0, pdata
->y_max
, 0, 0);
326 input_set_abs_params(input
, ABS_MT_POSITION_X
, 0, pdata
->x_max
, 0, 0);
327 input_set_abs_params(input
, ABS_MT_POSITION_Y
, 0, pdata
->y_max
, 0, 0);
329 input_set_drvdata(input
, tsdata
);
331 error
= devm_request_threaded_irq(dev
, client
->irq
, NULL
, pixcir_ts_isr
,
332 IRQF_TRIGGER_FALLING
| IRQF_ONESHOT
,
333 client
->name
, tsdata
);
335 dev_err(dev
, "failed to request irq %d\n", client
->irq
);
339 /* Always be in IDLE mode to save power, device supports auto wake */
340 error
= pixcir_set_power_mode(tsdata
, PIXCIR_POWER_IDLE
);
342 dev_err(dev
, "Failed to set IDLE mode\n");
346 /* Stop device till opened */
347 error
= pixcir_stop(tsdata
);
351 error
= input_register_device(input
);
355 device_init_wakeup(&client
->dev
, 1);
360 static int pixcir_i2c_ts_remove(struct i2c_client
*client
)
362 device_init_wakeup(&client
->dev
, 0);
367 static const struct i2c_device_id pixcir_i2c_ts_id
[] = {
371 MODULE_DEVICE_TABLE(i2c
, pixcir_i2c_ts_id
);
373 static struct i2c_driver pixcir_i2c_ts_driver
= {
375 .owner
= THIS_MODULE
,
377 .pm
= &pixcir_dev_pm_ops
,
379 .probe
= pixcir_i2c_ts_probe
,
380 .remove
= pixcir_i2c_ts_remove
,
381 .id_table
= pixcir_i2c_ts_id
,
384 module_i2c_driver(pixcir_i2c_ts_driver
);
386 MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
387 MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
388 MODULE_LICENSE("GPL");