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>
32 #include <media/lirc.h>
33 #include <media/lirc_dev.h>
34 #include <media/ir-rx51.h>
36 #define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \
37 LIRC_CAN_SET_SEND_CARRIER | \
40 #define DRIVER_NAME "lirc_rx51"
44 #define TIMER_MAX_VALUE 0xffffffff
47 struct omap_dm_timer
*pwm_timer
;
48 struct omap_dm_timer
*pulse_timer
;
50 struct lirc_rx51_platform_data
*pdata
;
51 wait_queue_head_t wqueue
;
53 unsigned long fclk_khz
;
54 unsigned int freq
; /* carrier frequency */
55 unsigned int duty_cycle
; /* carrier duty cycle */
60 unsigned long device_is_open
;
64 static void lirc_rx51_on(struct lirc_rx51
*lirc_rx51
)
66 omap_dm_timer_set_pwm(lirc_rx51
->pwm_timer
, 0, 1,
67 OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE
);
70 static void lirc_rx51_off(struct lirc_rx51
*lirc_rx51
)
72 omap_dm_timer_set_pwm(lirc_rx51
->pwm_timer
, 0, 1,
73 OMAP_TIMER_TRIGGER_NONE
);
76 static int init_timing_params(struct lirc_rx51
*lirc_rx51
)
80 load
= -(lirc_rx51
->fclk_khz
* 1000 / lirc_rx51
->freq
);
81 match
= -(lirc_rx51
->duty_cycle
* -load
/ 100);
82 omap_dm_timer_set_load(lirc_rx51
->pwm_timer
, 1, load
);
83 omap_dm_timer_set_match(lirc_rx51
->pwm_timer
, 1, match
);
84 omap_dm_timer_write_counter(lirc_rx51
->pwm_timer
, TIMER_MAX_VALUE
- 2);
85 omap_dm_timer_start(lirc_rx51
->pwm_timer
);
86 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
87 omap_dm_timer_start(lirc_rx51
->pulse_timer
);
94 #define tics_after(a, b) ((long)(b) - (long)(a) < 0)
96 static int pulse_timer_set_timeout(struct lirc_rx51
*lirc_rx51
, int usec
)
102 if (lirc_rx51
->match
== 0)
103 counter
= omap_dm_timer_read_counter(lirc_rx51
->pulse_timer
);
105 counter
= lirc_rx51
->match
;
107 counter
+= (u32
)(lirc_rx51
->fclk_khz
* usec
/ (1000));
108 omap_dm_timer_set_match(lirc_rx51
->pulse_timer
, 1, counter
);
109 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
,
110 OMAP_TIMER_INT_MATCH
);
111 if (tics_after(omap_dm_timer_read_counter(lirc_rx51
->pulse_timer
),
118 static irqreturn_t
lirc_rx51_interrupt_handler(int irq
, void *ptr
)
121 struct lirc_rx51
*lirc_rx51
= ptr
;
123 retval
= omap_dm_timer_read_status(lirc_rx51
->pulse_timer
);
127 if (retval
& ~OMAP_TIMER_INT_MATCH
)
128 dev_err_ratelimited(lirc_rx51
->dev
,
129 ": Unexpected interrupt source: %x\n", retval
);
131 omap_dm_timer_write_status(lirc_rx51
->pulse_timer
,
132 OMAP_TIMER_INT_MATCH
|
133 OMAP_TIMER_INT_OVERFLOW
|
134 OMAP_TIMER_INT_CAPTURE
);
135 if (lirc_rx51
->wbuf_index
< 0) {
136 dev_err_ratelimited(lirc_rx51
->dev
,
137 ": BUG wbuf_index has value of %i\n",
138 lirc_rx51
->wbuf_index
);
143 * If we happen to hit an odd latency spike, loop through the
144 * pulses until we catch up.
147 if (lirc_rx51
->wbuf_index
>= WBUF_LEN
)
149 if (lirc_rx51
->wbuf
[lirc_rx51
->wbuf_index
] == -1)
152 if (lirc_rx51
->wbuf_index
% 2)
153 lirc_rx51_off(lirc_rx51
);
155 lirc_rx51_on(lirc_rx51
);
157 retval
= pulse_timer_set_timeout(lirc_rx51
,
158 lirc_rx51
->wbuf
[lirc_rx51
->wbuf_index
]);
159 lirc_rx51
->wbuf_index
++;
166 lirc_rx51_off(lirc_rx51
);
167 lirc_rx51
->wbuf_index
= -1;
168 omap_dm_timer_stop(lirc_rx51
->pwm_timer
);
169 omap_dm_timer_stop(lirc_rx51
->pulse_timer
);
170 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
171 wake_up_interruptible(&lirc_rx51
->wqueue
);
176 static int lirc_rx51_init_port(struct lirc_rx51
*lirc_rx51
)
178 struct clk
*clk_fclk
;
179 int retval
, pwm_timer
= lirc_rx51
->pwm_timer_num
;
181 lirc_rx51
->pwm_timer
= omap_dm_timer_request_specific(pwm_timer
);
182 if (lirc_rx51
->pwm_timer
== NULL
) {
183 dev_err(lirc_rx51
->dev
, ": Error requesting GPT%d timer\n",
188 lirc_rx51
->pulse_timer
= omap_dm_timer_request();
189 if (lirc_rx51
->pulse_timer
== NULL
) {
190 dev_err(lirc_rx51
->dev
, ": Error requesting pulse timer\n");
195 omap_dm_timer_set_source(lirc_rx51
->pwm_timer
, OMAP_TIMER_SRC_SYS_CLK
);
196 omap_dm_timer_set_source(lirc_rx51
->pulse_timer
,
197 OMAP_TIMER_SRC_SYS_CLK
);
199 omap_dm_timer_enable(lirc_rx51
->pwm_timer
);
200 omap_dm_timer_enable(lirc_rx51
->pulse_timer
);
202 lirc_rx51
->irq_num
= omap_dm_timer_get_irq(lirc_rx51
->pulse_timer
);
203 retval
= request_irq(lirc_rx51
->irq_num
, lirc_rx51_interrupt_handler
,
204 IRQF_DISABLED
| IRQF_SHARED
,
205 "lirc_pulse_timer", lirc_rx51
);
207 dev_err(lirc_rx51
->dev
, ": Failed to request interrupt line\n");
211 clk_fclk
= omap_dm_timer_get_fclk(lirc_rx51
->pwm_timer
);
212 lirc_rx51
->fclk_khz
= clk_fclk
->rate
/ 1000;
217 omap_dm_timer_free(lirc_rx51
->pulse_timer
);
219 omap_dm_timer_free(lirc_rx51
->pwm_timer
);
224 static int lirc_rx51_free_port(struct lirc_rx51
*lirc_rx51
)
226 omap_dm_timer_set_int_enable(lirc_rx51
->pulse_timer
, 0);
227 free_irq(lirc_rx51
->irq_num
, lirc_rx51
);
228 lirc_rx51_off(lirc_rx51
);
229 omap_dm_timer_disable(lirc_rx51
->pwm_timer
);
230 omap_dm_timer_disable(lirc_rx51
->pulse_timer
);
231 omap_dm_timer_free(lirc_rx51
->pwm_timer
);
232 omap_dm_timer_free(lirc_rx51
->pulse_timer
);
233 lirc_rx51
->wbuf_index
= -1;
238 static ssize_t
lirc_rx51_write(struct file
*file
, const char *buf
,
239 size_t n
, loff_t
*ppos
)
242 struct lirc_rx51
*lirc_rx51
= file
->private_data
;
247 count
= n
/ sizeof(int);
248 if ((count
> WBUF_LEN
) || (count
% 2 == 0))
251 /* Wait any pending transfers to finish */
252 wait_event_interruptible(lirc_rx51
->wqueue
, lirc_rx51
->wbuf_index
< 0);
254 if (copy_from_user(lirc_rx51
->wbuf
, buf
, n
))
257 /* Sanity check the input pulses */
258 for (i
= 0; i
< count
; i
++)
259 if (lirc_rx51
->wbuf
[i
] < 0)
262 init_timing_params(lirc_rx51
);
263 if (count
< WBUF_LEN
)
264 lirc_rx51
->wbuf
[count
] = -1; /* Insert termination mark */
267 * Adjust latency requirements so the device doesn't go in too
270 lirc_rx51
->pdata
->set_max_mpu_wakeup_lat(lirc_rx51
->dev
, 50);
272 lirc_rx51_on(lirc_rx51
);
273 lirc_rx51
->wbuf_index
= 1;
274 pulse_timer_set_timeout(lirc_rx51
, lirc_rx51
->wbuf
[0]);
277 * Don't return back to the userspace until the transfer has
280 wait_event_interruptible(lirc_rx51
->wqueue
, lirc_rx51
->wbuf_index
< 0);
282 /* We can sleep again */
283 lirc_rx51
->pdata
->set_max_mpu_wakeup_lat(lirc_rx51
->dev
, -1);
288 static long lirc_rx51_ioctl(struct file
*filep
,
289 unsigned int cmd
, unsigned long arg
)
294 struct lirc_rx51
*lirc_rx51
= filep
->private_data
;
297 case LIRC_GET_SEND_MODE
:
298 result
= put_user(LIRC_MODE_PULSE
, (unsigned long *)arg
);
303 case LIRC_SET_SEND_MODE
:
304 result
= get_user(value
, (unsigned long *)arg
);
308 /* only LIRC_MODE_PULSE supported */
309 if (value
!= LIRC_MODE_PULSE
)
313 case LIRC_GET_REC_MODE
:
314 result
= put_user(0, (unsigned long *) arg
);
319 case LIRC_GET_LENGTH
:
323 case LIRC_SET_SEND_DUTY_CYCLE
:
324 result
= get_user(ivalue
, (unsigned int *) arg
);
328 if (ivalue
<= 0 || ivalue
> 100) {
329 dev_err(lirc_rx51
->dev
, ": invalid duty cycle %d\n",
334 lirc_rx51
->duty_cycle
= ivalue
;
337 case LIRC_SET_SEND_CARRIER
:
338 result
= get_user(ivalue
, (unsigned int *) arg
);
342 if (ivalue
> 500000 || ivalue
< 20000) {
343 dev_err(lirc_rx51
->dev
, ": invalid carrier freq %d\n",
348 lirc_rx51
->freq
= ivalue
;
351 case LIRC_GET_FEATURES
:
352 result
= put_user(LIRC_RX51_DRIVER_FEATURES
,
353 (unsigned long *) arg
);
365 static int lirc_rx51_open(struct inode
*inode
, struct file
*file
)
367 struct lirc_rx51
*lirc_rx51
= lirc_get_pdata(file
);
370 file
->private_data
= lirc_rx51
;
372 if (test_and_set_bit(1, &lirc_rx51
->device_is_open
))
375 return lirc_rx51_init_port(lirc_rx51
);
378 static int lirc_rx51_release(struct inode
*inode
, struct file
*file
)
380 struct lirc_rx51
*lirc_rx51
= file
->private_data
;
382 lirc_rx51_free_port(lirc_rx51
);
384 clear_bit(1, &lirc_rx51
->device_is_open
);
389 static struct lirc_rx51 lirc_rx51
= {
395 static const struct file_operations lirc_fops
= {
396 .owner
= THIS_MODULE
,
397 .write
= lirc_rx51_write
,
398 .unlocked_ioctl
= lirc_rx51_ioctl
,
399 .read
= lirc_dev_fop_read
,
400 .poll
= lirc_dev_fop_poll
,
401 .open
= lirc_rx51_open
,
402 .release
= lirc_rx51_release
,
405 static struct lirc_driver lirc_rx51_driver
= {
411 .owner
= THIS_MODULE
,
416 static int lirc_rx51_suspend(struct platform_device
*dev
, pm_message_t state
)
419 * In case the device is still open, do not suspend. Normally
420 * this should not be a problem as lircd only keeps the device
421 * open only for short periods of time. We also don't want to
422 * get involved with race conditions that might happen if we
423 * were in a middle of a transmit. Thus, we defer any suspend
424 * actions until transmit has completed.
426 if (test_and_set_bit(1, &lirc_rx51
.device_is_open
))
429 clear_bit(1, &lirc_rx51
.device_is_open
);
434 static int lirc_rx51_resume(struct platform_device
*dev
)
441 #define lirc_rx51_suspend NULL
442 #define lirc_rx51_resume NULL
444 #endif /* CONFIG_PM */
446 static int lirc_rx51_probe(struct platform_device
*dev
)
448 lirc_rx51_driver
.features
= LIRC_RX51_DRIVER_FEATURES
;
449 lirc_rx51
.pdata
= dev
->dev
.platform_data
;
450 lirc_rx51
.pwm_timer_num
= lirc_rx51
.pdata
->pwm_timer
;
451 lirc_rx51
.dev
= &dev
->dev
;
452 lirc_rx51_driver
.dev
= &dev
->dev
;
453 lirc_rx51_driver
.minor
= lirc_register_driver(&lirc_rx51_driver
);
454 init_waitqueue_head(&lirc_rx51
.wqueue
);
456 if (lirc_rx51_driver
.minor
< 0) {
457 dev_err(lirc_rx51
.dev
, ": lirc_register_driver failed: %d\n",
458 lirc_rx51_driver
.minor
);
459 return lirc_rx51_driver
.minor
;
461 dev_info(lirc_rx51
.dev
, "registration ok, minor: %d, pwm: %d\n",
462 lirc_rx51_driver
.minor
, lirc_rx51
.pwm_timer_num
);
467 static int lirc_rx51_remove(struct platform_device
*dev
)
469 return lirc_unregister_driver(lirc_rx51_driver
.minor
);
472 struct platform_driver lirc_rx51_platform_driver
= {
473 .probe
= lirc_rx51_probe
,
474 .remove
= lirc_rx51_remove
,
475 .suspend
= lirc_rx51_suspend
,
476 .resume
= lirc_rx51_resume
,
479 .owner
= THIS_MODULE
,
482 module_platform_driver(lirc_rx51_platform_driver
);
484 MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
485 MODULE_AUTHOR("Nokia Corporation");
486 MODULE_LICENSE("GPL");