2 * Copyright (C) 2008 Nokia Corporation
4 * Based on lirc_serial.c
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/module.h>
23 #include <linux/interrupt.h>
24 #include <linux/uaccess.h>
25 #include <linux/platform_device.h>
26 #include <linux/sched.h>
27 #include <linux/wait.h>
29 #include <plat/dmtimer.h>
30 #include <plat/clock.h>
31 #include <plat/omap-pm.h>
33 #include <media/lirc.h>
34 #include <media/lirc_dev.h>
35 #include <media/ir-rx51.h>
37 #define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \
38 LIRC_CAN_SET_SEND_CARRIER | \
41 #define DRIVER_NAME "lirc_rx51"
45 #define TIMER_MAX_VALUE 0xffffffff
48 struct omap_dm_timer
*pwm_timer
;
49 struct omap_dm_timer
*pulse_timer
;
51 struct lirc_rx51_platform_data
*pdata
;
52 wait_queue_head_t wqueue
;
54 unsigned long fclk_khz
;
55 unsigned int freq
; /* carrier frequency */
56 unsigned int duty_cycle
; /* carrier duty cycle */
61 unsigned long device_is_open
;
65 static void lirc_rx51_on(struct lirc_rx51
*lirc_rx51
)
67 omap_dm_timer_set_pwm(lirc_rx51
->pwm_timer
, 0, 1,
68 OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE
);
71 static void lirc_rx51_off(struct lirc_rx51
*lirc_rx51
)
73 omap_dm_timer_set_pwm(lirc_rx51
->pwm_timer
, 0, 1,
74 OMAP_TIMER_TRIGGER_NONE
);
77 static int init_timing_params(struct lirc_rx51
*lirc_rx51
)
81 load
= -(lirc_rx51
->fclk_khz
* 1000 / lirc_rx51
->freq
);
82 match
= -(lirc_rx51
->duty_cycle
* -load
/ 100);
83 omap_dm_timer_set_load(lirc_rx51
->pwm_timer
, 1, load
);
84 omap_dm_timer_set_match(lirc_rx51
->pwm_timer
, 1, match
);
85 omap_dm_timer_write_counter(lirc_rx51
->pwm_timer
, TIMER_MAX_VALUE
- 2);
86 omap_dm_timer_start(lirc_rx51
->pwm_timer
);
87 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
88 omap_dm_timer_start(lirc_rx51
->pulse_timer
);
95 #define tics_after(a, b) ((long)(b) - (long)(a) < 0)
97 static int pulse_timer_set_timeout(struct lirc_rx51
*lirc_rx51
, int usec
)
103 if (lirc_rx51
->match
== 0)
104 counter
= omap_dm_timer_read_counter(lirc_rx51
->pulse_timer
);
106 counter
= lirc_rx51
->match
;
108 counter
+= (u32
)(lirc_rx51
->fclk_khz
* usec
/ (1000));
109 omap_dm_timer_set_match(lirc_rx51
->pulse_timer
, 1, counter
);
110 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
,
111 OMAP_TIMER_INT_MATCH
);
112 if (tics_after(omap_dm_timer_read_counter(lirc_rx51
->pulse_timer
),
119 static irqreturn_t
lirc_rx51_interrupt_handler(int irq
, void *ptr
)
122 struct lirc_rx51
*lirc_rx51
= ptr
;
124 retval
= omap_dm_timer_read_status(lirc_rx51
->pulse_timer
);
128 if (retval
& ~OMAP_TIMER_INT_MATCH
)
129 dev_err_ratelimited(lirc_rx51
->dev
,
130 ": Unexpected interrupt source: %x\n", retval
);
132 omap_dm_timer_write_status(lirc_rx51
->pulse_timer
,
133 OMAP_TIMER_INT_MATCH
|
134 OMAP_TIMER_INT_OVERFLOW
|
135 OMAP_TIMER_INT_CAPTURE
);
136 if (lirc_rx51
->wbuf_index
< 0) {
137 dev_err_ratelimited(lirc_rx51
->dev
,
138 ": BUG wbuf_index has value of %i\n",
139 lirc_rx51
->wbuf_index
);
144 * If we happen to hit an odd latency spike, loop through the
145 * pulses until we catch up.
148 if (lirc_rx51
->wbuf_index
>= WBUF_LEN
)
150 if (lirc_rx51
->wbuf
[lirc_rx51
->wbuf_index
] == -1)
153 if (lirc_rx51
->wbuf_index
% 2)
154 lirc_rx51_off(lirc_rx51
);
156 lirc_rx51_on(lirc_rx51
);
158 retval
= pulse_timer_set_timeout(lirc_rx51
,
159 lirc_rx51
->wbuf
[lirc_rx51
->wbuf_index
]);
160 lirc_rx51
->wbuf_index
++;
167 lirc_rx51_off(lirc_rx51
);
168 lirc_rx51
->wbuf_index
= -1;
169 omap_dm_timer_stop(lirc_rx51
->pwm_timer
);
170 omap_dm_timer_stop(lirc_rx51
->pulse_timer
);
171 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
172 wake_up_interruptible(&lirc_rx51
->wqueue
);
177 static int lirc_rx51_init_port(struct lirc_rx51
*lirc_rx51
)
179 struct clk
*clk_fclk
;
180 int retval
, pwm_timer
= lirc_rx51
->pwm_timer_num
;
182 lirc_rx51
->pwm_timer
= omap_dm_timer_request_specific(pwm_timer
);
183 if (lirc_rx51
->pwm_timer
== NULL
) {
184 dev_err(lirc_rx51
->dev
, ": Error requesting GPT%d timer\n",
189 lirc_rx51
->pulse_timer
= omap_dm_timer_request();
190 if (lirc_rx51
->pulse_timer
== NULL
) {
191 dev_err(lirc_rx51
->dev
, ": Error requesting pulse timer\n");
196 omap_dm_timer_set_source(lirc_rx51
->pwm_timer
, OMAP_TIMER_SRC_SYS_CLK
);
197 omap_dm_timer_set_source(lirc_rx51
->pulse_timer
,
198 OMAP_TIMER_SRC_SYS_CLK
);
200 omap_dm_timer_enable(lirc_rx51
->pwm_timer
);
201 omap_dm_timer_enable(lirc_rx51
->pulse_timer
);
203 lirc_rx51
->irq_num
= omap_dm_timer_get_irq(lirc_rx51
->pulse_timer
);
204 retval
= request_irq(lirc_rx51
->irq_num
, lirc_rx51_interrupt_handler
,
205 IRQF_DISABLED
| IRQF_SHARED
,
206 "lirc_pulse_timer", lirc_rx51
);
208 dev_err(lirc_rx51
->dev
, ": Failed to request interrupt line\n");
212 clk_fclk
= omap_dm_timer_get_fclk(lirc_rx51
->pwm_timer
);
213 lirc_rx51
->fclk_khz
= clk_fclk
->rate
/ 1000;
218 omap_dm_timer_free(lirc_rx51
->pulse_timer
);
220 omap_dm_timer_free(lirc_rx51
->pwm_timer
);
225 static int lirc_rx51_free_port(struct lirc_rx51
*lirc_rx51
)
227 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
228 free_irq(lirc_rx51
->irq_num
, lirc_rx51
);
229 lirc_rx51_off(lirc_rx51
);
230 omap_dm_timer_disable(lirc_rx51
->pwm_timer
);
231 omap_dm_timer_disable(lirc_rx51
->pulse_timer
);
232 omap_dm_timer_free(lirc_rx51
->pwm_timer
);
233 omap_dm_timer_free(lirc_rx51
->pulse_timer
);
234 lirc_rx51
->wbuf_index
= -1;
239 static ssize_t
lirc_rx51_write(struct file
*file
, const char *buf
,
240 size_t n
, loff_t
*ppos
)
243 struct lirc_rx51
*lirc_rx51
= file
->private_data
;
248 count
= n
/ sizeof(int);
249 if ((count
> WBUF_LEN
) || (count
% 2 == 0))
252 /* Wait any pending transfers to finish */
253 wait_event_interruptible(lirc_rx51
->wqueue
, lirc_rx51
->wbuf_index
< 0);
255 if (copy_from_user(lirc_rx51
->wbuf
, buf
, n
))
258 /* Sanity check the input pulses */
259 for (i
= 0; i
< count
; i
++)
260 if (lirc_rx51
->wbuf
[i
] < 0)
263 init_timing_params(lirc_rx51
);
264 if (count
< WBUF_LEN
)
265 lirc_rx51
->wbuf
[count
] = -1; /* Insert termination mark */
268 * Adjust latency requirements so the device doesn't go in too
271 lirc_rx51
->pdata
->set_max_mpu_wakeup_lat(lirc_rx51
->dev
, 50);
273 lirc_rx51_on(lirc_rx51
);
274 lirc_rx51
->wbuf_index
= 1;
275 pulse_timer_set_timeout(lirc_rx51
, lirc_rx51
->wbuf
[0]);
278 * Don't return back to the userspace until the transfer has
281 wait_event_interruptible(lirc_rx51
->wqueue
, lirc_rx51
->wbuf_index
< 0);
283 /* We can sleep again */
284 lirc_rx51
->pdata
->set_max_mpu_wakeup_lat(lirc_rx51
->dev
, -1);
289 static long lirc_rx51_ioctl(struct file
*filep
,
290 unsigned int cmd
, unsigned long arg
)
295 struct lirc_rx51
*lirc_rx51
= filep
->private_data
;
298 case LIRC_GET_SEND_MODE
:
299 result
= put_user(LIRC_MODE_PULSE
, (unsigned long *)arg
);
304 case LIRC_SET_SEND_MODE
:
305 result
= get_user(value
, (unsigned long *)arg
);
309 /* only LIRC_MODE_PULSE supported */
310 if (value
!= LIRC_MODE_PULSE
)
314 case LIRC_GET_REC_MODE
:
315 result
= put_user(0, (unsigned long *) arg
);
320 case LIRC_GET_LENGTH
:
324 case LIRC_SET_SEND_DUTY_CYCLE
:
325 result
= get_user(ivalue
, (unsigned int *) arg
);
329 if (ivalue
<= 0 || ivalue
> 100) {
330 dev_err(lirc_rx51
->dev
, ": invalid duty cycle %d\n",
335 lirc_rx51
->duty_cycle
= ivalue
;
338 case LIRC_SET_SEND_CARRIER
:
339 result
= get_user(ivalue
, (unsigned int *) arg
);
343 if (ivalue
> 500000 || ivalue
< 20000) {
344 dev_err(lirc_rx51
->dev
, ": invalid carrier freq %d\n",
349 lirc_rx51
->freq
= ivalue
;
352 case LIRC_GET_FEATURES
:
353 result
= put_user(LIRC_RX51_DRIVER_FEATURES
,
354 (unsigned long *) arg
);
366 static int lirc_rx51_open(struct inode
*inode
, struct file
*file
)
368 struct lirc_rx51
*lirc_rx51
= lirc_get_pdata(file
);
371 file
->private_data
= lirc_rx51
;
373 if (test_and_set_bit(1, &lirc_rx51
->device_is_open
))
376 return lirc_rx51_init_port(lirc_rx51
);
379 static int lirc_rx51_release(struct inode
*inode
, struct file
*file
)
381 struct lirc_rx51
*lirc_rx51
= file
->private_data
;
383 lirc_rx51_free_port(lirc_rx51
);
385 clear_bit(1, &lirc_rx51
->device_is_open
);
390 static struct lirc_rx51 lirc_rx51
= {
396 static const struct file_operations lirc_fops
= {
397 .owner
= THIS_MODULE
,
398 .write
= lirc_rx51_write
,
399 .unlocked_ioctl
= lirc_rx51_ioctl
,
400 .read
= lirc_dev_fop_read
,
401 .poll
= lirc_dev_fop_poll
,
402 .open
= lirc_rx51_open
,
403 .release
= lirc_rx51_release
,
406 static struct lirc_driver lirc_rx51_driver
= {
412 .owner
= THIS_MODULE
,
417 static int lirc_rx51_suspend(struct platform_device
*dev
, pm_message_t state
)
420 * In case the device is still open, do not suspend. Normally
421 * this should not be a problem as lircd only keeps the device
422 * open only for short periods of time. We also don't want to
423 * get involved with race conditions that might happen if we
424 * were in a middle of a transmit. Thus, we defer any suspend
425 * actions until transmit has completed.
427 if (test_and_set_bit(1, &lirc_rx51
.device_is_open
))
430 clear_bit(1, &lirc_rx51
.device_is_open
);
435 static int lirc_rx51_resume(struct platform_device
*dev
)
442 #define lirc_rx51_suspend NULL
443 #define lirc_rx51_resume NULL
445 #endif /* CONFIG_PM */
447 static int __devinit
lirc_rx51_probe(struct platform_device
*dev
)
449 lirc_rx51_driver
.features
= LIRC_RX51_DRIVER_FEATURES
;
450 lirc_rx51
.pdata
= dev
->dev
.platform_data
;
451 lirc_rx51
.pwm_timer_num
= lirc_rx51
.pdata
->pwm_timer
;
452 lirc_rx51
.dev
= &dev
->dev
;
453 lirc_rx51_driver
.dev
= &dev
->dev
;
454 lirc_rx51_driver
.minor
= lirc_register_driver(&lirc_rx51_driver
);
455 init_waitqueue_head(&lirc_rx51
.wqueue
);
457 if (lirc_rx51_driver
.minor
< 0) {
458 dev_err(lirc_rx51
.dev
, ": lirc_register_driver failed: %d\n",
459 lirc_rx51_driver
.minor
);
460 return lirc_rx51_driver
.minor
;
462 dev_info(lirc_rx51
.dev
, "registration ok, minor: %d, pwm: %d\n",
463 lirc_rx51_driver
.minor
, lirc_rx51
.pwm_timer_num
);
468 static int __exit
lirc_rx51_remove(struct platform_device
*dev
)
470 return lirc_unregister_driver(lirc_rx51_driver
.minor
);
473 struct platform_driver lirc_rx51_platform_driver
= {
474 .probe
= lirc_rx51_probe
,
475 .remove
= __exit_p(lirc_rx51_remove
),
476 .suspend
= lirc_rx51_suspend
,
477 .resume
= lirc_rx51_resume
,
480 .owner
= THIS_MODULE
,
484 static int __init
lirc_rx51_init(void)
486 return platform_driver_register(&lirc_rx51_platform_driver
);
488 module_init(lirc_rx51_init
);
490 static void __exit
lirc_rx51_exit(void)
492 platform_driver_unregister(&lirc_rx51_platform_driver
);
494 module_exit(lirc_rx51_exit
);
496 MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
497 MODULE_AUTHOR("Nokia Corporation");
498 MODULE_LICENSE("GPL");