2 * Driver for the Conexant CX23885/7/8 PCIe bridge
4 * CX23888 Integrated Consumer Infrared Controller
6 * Copyright (C) 2009 Andy Walls <awalls@radix.net>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program 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
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 #include <linux/kfifo.h>
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-chip-ident.h>
31 static unsigned int ir_888_debug;
32 module_param(ir_888_debug, int, 0644);
33 MODULE_PARM_DESC(ir_888_debug, "enable debug messages [CX23888 IR controller]");
35 #define CX23888_IR_REG_BASE 0x170000
37 * These CX23888 register offsets have a straightforward one to one mapping
38 * to the CX23885 register offsets of 0x200 through 0x218
40 #define CX23888_IR_CNTRL_REG 0x170000
41 #define CNTRL_WIN_3_3 0x00000000
42 #define CNTRL_WIN_4_3 0x00000001
43 #define CNTRL_WIN_3_4 0x00000002
44 #define CNTRL_WIN_4_4 0x00000003
45 #define CNTRL_WIN 0x00000003
46 #define CNTRL_EDG_NONE 0x00000000
47 #define CNTRL_EDG_FALL 0x00000004
48 #define CNTRL_EDG_RISE 0x00000008
49 #define CNTRL_EDG_BOTH 0x0000000C
50 #define CNTRL_EDG 0x0000000C
51 #define CNTRL_DMD 0x00000010
52 #define CNTRL_MOD 0x00000020
53 #define CNTRL_RFE 0x00000040
54 #define CNTRL_TFE 0x00000080
55 #define CNTRL_RXE 0x00000100
56 #define CNTRL_TXE 0x00000200
57 #define CNTRL_RIC 0x00000400
58 #define CNTRL_TIC 0x00000800
59 #define CNTRL_CPL 0x00001000
60 #define CNTRL_LBM 0x00002000
61 #define CNTRL_R 0x00004000
63 #define CX23888_IR_TXCLK_REG 0x170004
64 #define TXCLK_TCD 0x0000FFFF
66 #define CX23888_IR_RXCLK_REG 0x170008
67 #define RXCLK_RCD 0x0000FFFF
69 #define CX23888_IR_CDUTY_REG 0x17000C
70 #define CDUTY_CDC 0x0000000F
72 #define CX23888_IR_STATS_REG 0x170010
73 #define STATS_RTO 0x00000001
74 #define STATS_ROR 0x00000002
75 #define STATS_RBY 0x00000004
76 #define STATS_TBY 0x00000008
77 #define STATS_RSR 0x00000010
78 #define STATS_TSR 0x00000020
80 #define CX23888_IR_IRQEN_REG 0x170014
81 #define IRQEN_RTE 0x00000001
82 #define IRQEN_ROE 0x00000002
83 #define IRQEN_RSE 0x00000010
84 #define IRQEN_TSE 0x00000020
86 #define CX23888_IR_FILTR_REG 0x170018
87 #define FILTR_LPF 0x0000FFFF
89 /* This register doesn't follow the pattern; it's 0x23C on a CX23885 */
90 #define CX23888_IR_FIFO_REG 0x170040
91 #define FIFO_RXTX 0x0000FFFF
92 #define FIFO_RXTX_LVL 0x00010000
93 #define FIFO_RXTX_RTO 0x0001FFFF
94 #define FIFO_RX_NDV 0x00020000
95 #define FIFO_RX_DEPTH 8
96 #define FIFO_TX_DEPTH 8
98 /* CX23888 unique registers */
99 #define CX23888_IR_SEEDP_REG 0x17001C
100 #define CX23888_IR_TIMOL_REG 0x170020
101 #define CX23888_IR_WAKE0_REG 0x170024
102 #define CX23888_IR_WAKE1_REG 0x170028
103 #define CX23888_IR_WAKE2_REG 0x17002C
104 #define CX23888_IR_MASK0_REG 0x170030
105 #define CX23888_IR_MASK1_REG 0x170034
106 #define CX23888_IR_MAKS2_REG 0x170038
107 #define CX23888_IR_DPIPG_REG 0x17003C
108 #define CX23888_IR_LEARN_REG 0x170044
110 #define CX23888_VIDCLK_FREQ 108000000 /* 108 MHz, BT.656 */
111 #define CX23888_IR_REFCLK_FREQ (CX23888_VIDCLK_FREQ/2)
113 #define CX23888_IR_RX_KFIFO_SIZE (512 * sizeof(u32))
114 #define CX23888_IR_TX_KFIFO_SIZE (512 * sizeof(u32))
116 struct cx23888_ir_state {
117 struct v4l2_subdev sd;
118 struct cx23885_dev *dev;
122 struct v4l2_subdev_ir_parameters rx_params;
123 struct mutex rx_params_lock;
124 atomic_t rxclk_divider;
127 struct kfifo *rx_kfifo;
128 spinlock_t rx_kfifo_lock;
130 struct v4l2_subdev_ir_parameters tx_params;
131 struct mutex tx_params_lock;
132 atomic_t txclk_divider;
134 struct kfifo *tx_kfifo;
135 spinlock_t tx_kfifo_lock;
138 static inline struct cx23888_ir_state *to_state(struct v4l2_subdev *sd)
140 return v4l2_get_subdevdata(sd);
144 * IR register block read and write functions
147 inline int cx23888_ir_write4(struct cx23885_dev *dev, u32 addr, u32 value)
149 cx_write(addr, value);
153 static inline u32 cx23888_ir_read4(struct cx23885_dev *dev, u32 addr)
155 return cx_read(addr);
158 static inline int cx23888_ir_and_or4(struct cx23885_dev *dev, u32 addr,
159 u32 and_mask, u32 or_value)
161 cx_andor(addr, ~and_mask, or_value);
166 * Rx and Tx Clock Divider register computations
168 * Note the largest clock divider value of 0xffff corresponds to:
169 * (0xffff + 1) * 1000 / 108/2 MHz = 1,213,629.629... ns
170 * which fits in 21 bits, so we'll use unsigned int for time arguments.
172 static inline u16 count_to_clock_divider(unsigned int d)
183 static inline u16 ns_to_clock_divider(unsigned int ns)
185 return count_to_clock_divider(
186 DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ/1000000 * ns, 1000));
189 static inline unsigned int clock_divider_to_ns(unsigned int divider)
191 /* Period of the Rx or Tx clock in ns */
192 return DIV_ROUND_CLOSEST((divider + 1) * 1000,
193 CX23888_IR_REFCLK_FREQ/1000000);
196 static inline u16 carrier_freq_to_clock_divider(unsigned int freq)
198 return count_to_clock_divider(
199 DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, freq * 16));
202 static inline unsigned int clock_divider_to_carrier_freq(unsigned int divider)
204 return DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, (divider + 1) * 16);
207 static inline u16 freq_to_clock_divider(unsigned int freq,
208 unsigned int rollovers)
210 return count_to_clock_divider(
211 DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, freq * rollovers));
214 static inline unsigned int clock_divider_to_freq(unsigned int divider,
215 unsigned int rollovers)
217 return DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ,
218 (divider + 1) * rollovers);
222 * Low Pass Filter register calculations
224 * Note the largest count value of 0xffff corresponds to:
225 * 0xffff * 1000 / 108/2 MHz = 1,213,611.11... ns
226 * which fits in 21 bits, so we'll use unsigned int for time arguments.
228 static inline u16 count_to_lpf_count(unsigned int d)
237 static inline u16 ns_to_lpf_count(unsigned int ns)
239 return count_to_lpf_count(
240 DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ/1000000 * ns, 1000));
243 static inline unsigned int lpf_count_to_ns(unsigned int count)
245 /* Duration of the Low Pass Filter rejection window in ns */
246 return DIV_ROUND_CLOSEST(count * 1000, CX23888_IR_REFCLK_FREQ/1000000);
249 static inline unsigned int lpf_count_to_us(unsigned int count)
251 /* Duration of the Low Pass Filter rejection window in us */
252 return DIV_ROUND_CLOSEST(count, CX23888_IR_REFCLK_FREQ/1000000);
256 * FIFO register pulse width count compuations
258 static u32 clock_divider_to_resolution(u16 divider)
261 * Resolution is the duration of 1 tick of the readable portion of
262 * of the pulse width counter as read from the FIFO. The two lsb's are
263 * not readable, hence the << 2. This function returns ns.
265 return DIV_ROUND_CLOSEST((1 << 2) * ((u32) divider + 1) * 1000,
266 CX23888_IR_REFCLK_FREQ/1000000);
269 static u64 pulse_width_count_to_ns(u16 count, u16 divider)
275 * The 2 lsb's of the pulse width timer count are not readable, hence
276 * the (count << 2) | 0x3
278 n = (((u64) count << 2) | 0x3) * (divider + 1) * 1000; /* millicycles */
279 rem = do_div(n, CX23888_IR_REFCLK_FREQ/1000000); /* / MHz => ns */
280 if (rem >= CX23888_IR_REFCLK_FREQ/1000000/2)
285 static unsigned int pulse_width_count_to_us(u16 count, u16 divider)
291 * The 2 lsb's of the pulse width timer count are not readable, hence
292 * the (count << 2) | 0x3
294 n = (((u64) count << 2) | 0x3) * (divider + 1); /* cycles */
295 rem = do_div(n, CX23888_IR_REFCLK_FREQ/1000000); /* / MHz => us */
296 if (rem >= CX23888_IR_REFCLK_FREQ/1000000/2)
298 return (unsigned int) n;
302 * Pulse Clocks computations: Combined Pulse Width Count & Rx Clock Counts
304 * The total pulse clock count is an 18 bit pulse width timer count as the most
305 * significant part and (up to) 16 bit clock divider count as a modulus.
306 * When the Rx clock divider ticks down to 0, it increments the 18 bit pulse
307 * width timer count's least significant bit.
309 static u64 ns_to_pulse_clocks(u32 ns)
313 clocks = CX23888_IR_REFCLK_FREQ/1000000 * (u64) ns; /* millicycles */
314 rem = do_div(clocks, 1000); /* /1000 = cycles */
320 static u16 pulse_clocks_to_clock_divider(u64 count)
324 rem = do_div(count, (FIFO_RXTX << 2) | 0x3);
326 /* net result needs to be rounded down and decremented by 1 */
327 if (count > RXCLK_RCD+1)
337 * IR Control Register helpers
339 enum tx_fifo_watermark {
340 TX_FIFO_HALF_EMPTY = 0,
341 TX_FIFO_EMPTY = CNTRL_TIC,
344 enum rx_fifo_watermark {
345 RX_FIFO_HALF_FULL = 0,
346 RX_FIFO_NOT_EMPTY = CNTRL_RIC,
349 static inline void control_tx_irq_watermark(struct cx23885_dev *dev,
350 enum tx_fifo_watermark level)
352 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_TIC, level);
355 static inline void control_rx_irq_watermark(struct cx23885_dev *dev,
356 enum rx_fifo_watermark level)
358 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_RIC, level);
361 static inline void control_tx_enable(struct cx23885_dev *dev, bool enable)
363 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~(CNTRL_TXE | CNTRL_TFE),
364 enable ? (CNTRL_TXE | CNTRL_TFE) : 0);
367 static inline void control_rx_enable(struct cx23885_dev *dev, bool enable)
369 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~(CNTRL_RXE | CNTRL_RFE),
370 enable ? (CNTRL_RXE | CNTRL_RFE) : 0);
373 static inline void control_tx_modulation_enable(struct cx23885_dev *dev,
376 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_MOD,
377 enable ? CNTRL_MOD : 0);
380 static inline void control_rx_demodulation_enable(struct cx23885_dev *dev,
383 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_DMD,
384 enable ? CNTRL_DMD : 0);
387 static inline void control_rx_s_edge_detection(struct cx23885_dev *dev,
390 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_EDG_BOTH,
391 edge_types & CNTRL_EDG_BOTH);
394 static void control_rx_s_carrier_window(struct cx23885_dev *dev,
395 unsigned int carrier,
396 unsigned int *carrier_range_low,
397 unsigned int *carrier_range_high)
400 unsigned int c16 = carrier * 16;
402 if (*carrier_range_low < DIV_ROUND_CLOSEST(c16, 16 + 3)) {
404 *carrier_range_low = DIV_ROUND_CLOSEST(c16, 16 + 4);
407 *carrier_range_low = DIV_ROUND_CLOSEST(c16, 16 + 3);
410 if (*carrier_range_high > DIV_ROUND_CLOSEST(c16, 16 - 3)) {
412 *carrier_range_high = DIV_ROUND_CLOSEST(c16, 16 - 4);
415 *carrier_range_high = DIV_ROUND_CLOSEST(c16, 16 - 3);
417 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_WIN, v);
420 static inline void control_tx_polarity_invert(struct cx23885_dev *dev,
423 cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_CPL,
424 invert ? CNTRL_CPL : 0);
428 * IR Rx & Tx Clock Register helpers
430 static unsigned int txclk_tx_s_carrier(struct cx23885_dev *dev,
434 *divider = carrier_freq_to_clock_divider(freq);
435 cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, *divider);
436 return clock_divider_to_carrier_freq(*divider);
439 static unsigned int rxclk_rx_s_carrier(struct cx23885_dev *dev,
443 *divider = carrier_freq_to_clock_divider(freq);
444 cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, *divider);
445 return clock_divider_to_carrier_freq(*divider);
448 static u32 txclk_tx_s_max_pulse_width(struct cx23885_dev *dev, u32 ns,
453 if (ns > V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS)
454 ns = V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS;
455 pulse_clocks = ns_to_pulse_clocks(ns);
456 *divider = pulse_clocks_to_clock_divider(pulse_clocks);
457 cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, *divider);
458 return (u32) pulse_width_count_to_ns(FIFO_RXTX, *divider);
461 static u32 rxclk_rx_s_max_pulse_width(struct cx23885_dev *dev, u32 ns,
466 if (ns > V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS)
467 ns = V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS;
468 pulse_clocks = ns_to_pulse_clocks(ns);
469 *divider = pulse_clocks_to_clock_divider(pulse_clocks);
470 cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, *divider);
471 return (u32) pulse_width_count_to_ns(FIFO_RXTX, *divider);
475 * IR Tx Carrier Duty Cycle register helpers
477 static unsigned int cduty_tx_s_duty_cycle(struct cx23885_dev *dev,
478 unsigned int duty_cycle)
481 n = DIV_ROUND_CLOSEST(duty_cycle * 100, 625); /* 16ths of 100% */
486 cx23888_ir_write4(dev, CX23888_IR_CDUTY_REG, n);
487 return DIV_ROUND_CLOSEST((n+1) * 100, 16);
491 * IR Filter Register helpers
493 static u32 filter_rx_s_min_width(struct cx23885_dev *dev, u32 min_width_ns)
495 u32 count = ns_to_lpf_count(min_width_ns);
496 cx23888_ir_write4(dev, CX23888_IR_FILTR_REG, count);
497 return lpf_count_to_ns(count);
501 * IR IRQ Enable Register helpers
503 static inline void irqenable_rx(struct cx23885_dev *dev, u32 mask)
505 mask &= (IRQEN_RTE | IRQEN_ROE | IRQEN_RSE);
506 cx23888_ir_and_or4(dev, CX23888_IR_IRQEN_REG,
507 ~(IRQEN_RTE | IRQEN_ROE | IRQEN_RSE), mask);
510 static inline void irqenable_tx(struct cx23885_dev *dev, u32 mask)
513 cx23888_ir_and_or4(dev, CX23888_IR_IRQEN_REG, ~IRQEN_TSE, mask);
517 * V4L2 Subdevice IR Ops
519 static int cx23888_ir_irq_handler(struct v4l2_subdev *sd, u32 status,
522 struct cx23888_ir_state *state = to_state(sd);
523 struct cx23885_dev *dev = state->dev;
525 u32 cntrl = cx23888_ir_read4(dev, CX23888_IR_CNTRL_REG);
526 u32 irqen = cx23888_ir_read4(dev, CX23888_IR_IRQEN_REG);
527 u32 stats = cx23888_ir_read4(dev, CX23888_IR_STATS_REG);
529 u32 rx_data[FIFO_RX_DEPTH];
532 int tsr, rsr, rto, ror, tse, rse, rte, roe, kror;
534 tsr = stats & STATS_TSR; /* Tx FIFO Service Request */
535 rsr = stats & STATS_RSR; /* Rx FIFO Service Request */
536 rto = stats & STATS_RTO; /* Rx Pulse Width Timer Time Out */
537 ror = stats & STATS_ROR; /* Rx FIFO Over Run */
539 tse = irqen & IRQEN_TSE; /* Tx FIFO Service Request IRQ Enable */
540 rse = irqen & IRQEN_RSE; /* Rx FIFO Service Reuqest IRQ Enable */
541 rte = irqen & IRQEN_RTE; /* Rx Pulse Width Timer Time Out IRQ Enable */
542 roe = irqen & IRQEN_ROE; /* Rx FIFO Over Run IRQ Enable */
545 v4l2_dbg(2, ir_888_debug, sd, "IRQ Status: %s %s %s %s %s %s\n",
546 tsr ? "tsr" : " ", rsr ? "rsr" : " ",
547 rto ? "rto" : " ", ror ? "ror" : " ",
548 stats & STATS_TBY ? "tby" : " ",
549 stats & STATS_RBY ? "rby" : " ");
551 v4l2_dbg(2, ir_888_debug, sd, "IRQ Enables: %s %s %s %s\n",
552 tse ? "tse" : " ", rse ? "rse" : " ",
553 rte ? "rte" : " ", roe ? "roe" : " ");
556 * Transmitter interrupt service
561 * Check the watermark threshold setting
562 * Pull FIFO_TX_DEPTH or FIFO_TX_DEPTH/2 entries from tx_kfifo
563 * Push the data to the hardware FIFO.
564 * If there was nothing more to send in the tx_kfifo, disable
565 * the TSR IRQ and notify the v4l2_device.
566 * If there was something in the tx_kfifo, check the tx_kfifo
567 * level and notify the v4l2_device, if it is low.
569 /* For now, inhibit TSR interrupt until Tx is implemented */
570 irqenable_tx(dev, 0);
571 events = V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
572 v4l2_subdev_notify(sd, V4L2_SUBDEV_IR_TX_NOTIFY, &events);
577 * Receiver interrupt service
580 if ((rse && rsr) || (rte && rto)) {
582 * Receive data on RSR to clear the STATS_RSR.
583 * Receive data on RTO, since we may not have yet hit the RSR
584 * watermark when we receive the RTO.
586 for (i = 0, v = FIFO_RX_NDV;
587 (v & FIFO_RX_NDV) && !kror; i = 0) {
589 (v & FIFO_RX_NDV) && j < FIFO_RX_DEPTH; j++) {
590 v = cx23888_ir_read4(dev, CX23888_IR_FIFO_REG);
591 rx_data[i++] = v & ~FIFO_RX_NDV;
596 k = kfifo_put(state->rx_kfifo,
597 (unsigned char *) rx_data, j);
599 kror++; /* rx_kfifo over run */
607 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
608 v4l2_err(sd, "IR receiver software FIFO overrun\n");
612 * The RX FIFO Enable (CNTRL_RFE) must be toggled to clear
613 * the Rx FIFO Over Run status (STATS_ROR)
616 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
617 v4l2_err(sd, "IR receiver hardware FIFO overrun\n");
621 * The IR Receiver Enable (CNTRL_RXE) must be toggled to clear
622 * the Rx Pulse Width Timer Time Out (STATS_RTO)
625 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
628 /* Clear STATS_ROR & STATS_RTO as needed by reseting hardware */
629 cx23888_ir_write4(dev, CX23888_IR_CNTRL_REG, cntrl & ~v);
630 cx23888_ir_write4(dev, CX23888_IR_CNTRL_REG, cntrl);
633 if (kfifo_len(state->rx_kfifo) >= CX23888_IR_RX_KFIFO_SIZE/2)
634 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
637 v4l2_subdev_notify(sd, V4L2_SUBDEV_IR_RX_NOTIFY, &events);
642 static int cx23888_ir_rx_read(struct v4l2_subdev *sd, u8 *buf, size_t count,
645 struct cx23888_ir_state *state = to_state(sd);
646 bool invert = (bool) atomic_read(&state->rx_invert);
647 u16 divider = (u16) atomic_read(&state->rxclk_divider);
653 n = count / sizeof(u32) * sizeof(u32);
659 n = kfifo_get(state->rx_kfifo, buf, n);
662 *num = n * sizeof(u32);
664 for (p = (u32 *) buf, i = 0; i < n; p++, i++) {
665 if ((*p & FIFO_RXTX_RTO) == FIFO_RXTX_RTO) {
666 *p = V4L2_SUBDEV_IR_PULSE_RX_SEQ_END;
667 v4l2_dbg(2, ir_888_debug, sd, "rx read: end of rx\n");
671 u = (*p & FIFO_RXTX_LVL) ? V4L2_SUBDEV_IR_PULSE_LEVEL_MASK : 0;
673 u = u ? 0 : V4L2_SUBDEV_IR_PULSE_LEVEL_MASK;
675 v = (u32) pulse_width_count_to_ns((u16) (*p & FIFO_RXTX),
677 if (v >= V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS)
678 v = V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS - 1;
682 v4l2_dbg(2, ir_888_debug, sd, "rx read: %10u ns %s\n",
683 v, u ? "mark" : "space");
688 static int cx23888_ir_rx_g_parameters(struct v4l2_subdev *sd,
689 struct v4l2_subdev_ir_parameters *p)
691 struct cx23888_ir_state *state = to_state(sd);
692 mutex_lock(&state->rx_params_lock);
693 memcpy(p, &state->rx_params, sizeof(struct v4l2_subdev_ir_parameters));
694 mutex_unlock(&state->rx_params_lock);
698 static int cx23888_ir_rx_shutdown(struct v4l2_subdev *sd)
700 struct cx23888_ir_state *state = to_state(sd);
701 struct cx23885_dev *dev = state->dev;
703 mutex_lock(&state->rx_params_lock);
705 /* Disable or slow down all IR Rx circuits and counters */
706 irqenable_rx(dev, 0);
707 control_rx_enable(dev, false);
708 control_rx_demodulation_enable(dev, false);
709 control_rx_s_edge_detection(dev, CNTRL_EDG_NONE);
710 filter_rx_s_min_width(dev, 0);
711 cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, RXCLK_RCD);
713 state->rx_params.shutdown = true;
715 mutex_unlock(&state->rx_params_lock);
719 static int cx23888_ir_rx_s_parameters(struct v4l2_subdev *sd,
720 struct v4l2_subdev_ir_parameters *p)
722 struct cx23888_ir_state *state = to_state(sd);
723 struct cx23885_dev *dev = state->dev;
724 struct v4l2_subdev_ir_parameters *o = &state->rx_params;
728 return cx23888_ir_rx_shutdown(sd);
730 if (p->mode != V4L2_SUBDEV_IR_MODE_PULSE_WIDTH)
733 mutex_lock(&state->rx_params_lock);
735 o->shutdown = p->shutdown;
737 o->mode = p->mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
739 o->bytes_per_data_element = p->bytes_per_data_element = sizeof(u32);
741 /* Before we tweak the hardware, we have to disable the receiver */
742 irqenable_rx(dev, 0);
743 control_rx_enable(dev, false);
745 control_rx_demodulation_enable(dev, p->modulation);
746 o->modulation = p->modulation;
749 p->carrier_freq = rxclk_rx_s_carrier(dev, p->carrier_freq,
752 o->carrier_freq = p->carrier_freq;
754 o->duty_cycle = p->duty_cycle = 50;
756 control_rx_s_carrier_window(dev, p->carrier_freq,
757 &p->carrier_range_lower,
758 &p->carrier_range_upper);
759 o->carrier_range_lower = p->carrier_range_lower;
760 o->carrier_range_upper = p->carrier_range_upper;
763 rxclk_rx_s_max_pulse_width(dev, p->max_pulse_width,
765 o->max_pulse_width = p->max_pulse_width;
767 atomic_set(&state->rxclk_divider, rxclk_divider);
769 p->noise_filter_min_width =
770 filter_rx_s_min_width(dev, p->noise_filter_min_width);
771 o->noise_filter_min_width = p->noise_filter_min_width;
773 p->resolution = clock_divider_to_resolution(rxclk_divider);
774 o->resolution = p->resolution;
776 /* FIXME - make this dependent on resolution for better performance */
777 control_rx_irq_watermark(dev, RX_FIFO_HALF_FULL);
779 control_rx_s_edge_detection(dev, CNTRL_EDG_BOTH);
781 o->invert = p->invert;
782 atomic_set(&state->rx_invert, p->invert);
784 o->interrupt_enable = p->interrupt_enable;
785 o->enable = p->enable;
787 kfifo_reset(state->rx_kfifo);
788 if (p->interrupt_enable)
789 irqenable_rx(dev, IRQEN_RSE | IRQEN_RTE | IRQEN_ROE);
790 control_rx_enable(dev, p->enable);
793 mutex_unlock(&state->rx_params_lock);
798 static int cx23888_ir_tx_write(struct v4l2_subdev *sd, u8 *buf, size_t count,
801 struct cx23888_ir_state *state = to_state(sd);
802 struct cx23885_dev *dev = state->dev;
803 /* For now enable the Tx FIFO Service interrupt & pretend we did work */
804 irqenable_tx(dev, IRQEN_TSE);
809 static int cx23888_ir_tx_g_parameters(struct v4l2_subdev *sd,
810 struct v4l2_subdev_ir_parameters *p)
812 struct cx23888_ir_state *state = to_state(sd);
813 mutex_lock(&state->tx_params_lock);
814 memcpy(p, &state->tx_params, sizeof(struct v4l2_subdev_ir_parameters));
815 mutex_unlock(&state->tx_params_lock);
819 static int cx23888_ir_tx_shutdown(struct v4l2_subdev *sd)
821 struct cx23888_ir_state *state = to_state(sd);
822 struct cx23885_dev *dev = state->dev;
824 mutex_lock(&state->tx_params_lock);
826 /* Disable or slow down all IR Tx circuits and counters */
827 irqenable_tx(dev, 0);
828 control_tx_enable(dev, false);
829 control_tx_modulation_enable(dev, false);
830 cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, TXCLK_TCD);
832 state->tx_params.shutdown = true;
834 mutex_unlock(&state->tx_params_lock);
838 static int cx23888_ir_tx_s_parameters(struct v4l2_subdev *sd,
839 struct v4l2_subdev_ir_parameters *p)
841 struct cx23888_ir_state *state = to_state(sd);
842 struct cx23885_dev *dev = state->dev;
843 struct v4l2_subdev_ir_parameters *o = &state->tx_params;
847 return cx23888_ir_tx_shutdown(sd);
849 if (p->mode != V4L2_SUBDEV_IR_MODE_PULSE_WIDTH)
852 mutex_lock(&state->tx_params_lock);
854 o->shutdown = p->shutdown;
856 o->mode = p->mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
858 o->bytes_per_data_element = p->bytes_per_data_element = sizeof(u32);
860 /* Before we tweak the hardware, we have to disable the transmitter */
861 irqenable_tx(dev, 0);
862 control_tx_enable(dev, false);
864 control_tx_modulation_enable(dev, p->modulation);
865 o->modulation = p->modulation;
868 p->carrier_freq = txclk_tx_s_carrier(dev, p->carrier_freq,
870 o->carrier_freq = p->carrier_freq;
872 p->duty_cycle = cduty_tx_s_duty_cycle(dev, p->duty_cycle);
873 o->duty_cycle = p->duty_cycle;
876 txclk_tx_s_max_pulse_width(dev, p->max_pulse_width,
878 o->max_pulse_width = p->max_pulse_width;
880 atomic_set(&state->txclk_divider, txclk_divider);
882 p->resolution = clock_divider_to_resolution(txclk_divider);
883 o->resolution = p->resolution;
885 /* FIXME - make this dependent on resolution for better performance */
886 control_tx_irq_watermark(dev, TX_FIFO_HALF_EMPTY);
888 control_tx_polarity_invert(dev, p->invert);
889 o->invert = p->invert;
891 o->interrupt_enable = p->interrupt_enable;
892 o->enable = p->enable;
894 kfifo_reset(state->tx_kfifo);
895 if (p->interrupt_enable)
896 irqenable_tx(dev, IRQEN_TSE);
897 control_tx_enable(dev, p->enable);
900 mutex_unlock(&state->tx_params_lock);
906 * V4L2 Subdevice Core Ops
908 static int cx23888_ir_log_status(struct v4l2_subdev *sd)
910 struct cx23888_ir_state *state = to_state(sd);
911 struct cx23885_dev *dev = state->dev;
915 u32 cntrl = cx23888_ir_read4(dev, CX23888_IR_CNTRL_REG);
916 u32 txclk = cx23888_ir_read4(dev, CX23888_IR_TXCLK_REG) & TXCLK_TCD;
917 u32 rxclk = cx23888_ir_read4(dev, CX23888_IR_RXCLK_REG) & RXCLK_RCD;
918 u32 cduty = cx23888_ir_read4(dev, CX23888_IR_CDUTY_REG) & CDUTY_CDC;
919 u32 stats = cx23888_ir_read4(dev, CX23888_IR_STATS_REG);
920 u32 irqen = cx23888_ir_read4(dev, CX23888_IR_IRQEN_REG);
921 u32 filtr = cx23888_ir_read4(dev, CX23888_IR_FILTR_REG) & FILTR_LPF;
923 v4l2_info(sd, "IR Receiver:\n");
924 v4l2_info(sd, "\tEnabled: %s\n",
925 cntrl & CNTRL_RXE ? "yes" : "no");
926 v4l2_info(sd, "\tDemodulation from a carrier: %s\n",
927 cntrl & CNTRL_DMD ? "enabled" : "disabled");
928 v4l2_info(sd, "\tFIFO: %s\n",
929 cntrl & CNTRL_RFE ? "enabled" : "disabled");
930 switch (cntrl & CNTRL_EDG) {
941 s = "rising & falling edges";
947 v4l2_info(sd, "\tPulse timers' start/stop trigger: %s\n", s);
948 v4l2_info(sd, "\tFIFO data on pulse timer overflow: %s\n",
949 cntrl & CNTRL_R ? "not loaded" : "overflow marker");
950 v4l2_info(sd, "\tFIFO interrupt watermark: %s\n",
951 cntrl & CNTRL_RIC ? "not empty" : "half full or greater");
952 v4l2_info(sd, "\tLoopback mode: %s\n",
953 cntrl & CNTRL_LBM ? "loopback active" : "normal receive");
954 if (cntrl & CNTRL_DMD) {
955 v4l2_info(sd, "\tExpected carrier (16 clocks): %u Hz\n",
956 clock_divider_to_carrier_freq(rxclk));
957 switch (cntrl & CNTRL_WIN) {
979 v4l2_info(sd, "\tNext carrier edge window: 16 clocks "
980 "-%1d/+%1d, %u to %u Hz\n", i, j,
981 clock_divider_to_freq(rxclk, 16 + j),
982 clock_divider_to_freq(rxclk, 16 - i));
984 v4l2_info(sd, "\tMax measurable pulse width: %u us, "
986 pulse_width_count_to_us(FIFO_RXTX, rxclk),
987 pulse_width_count_to_ns(FIFO_RXTX, rxclk));
989 v4l2_info(sd, "\tLow pass filter: %s\n",
990 filtr ? "enabled" : "disabled");
992 v4l2_info(sd, "\tMin acceptable pulse width (LPF): %u us, "
994 lpf_count_to_us(filtr),
995 lpf_count_to_ns(filtr));
996 v4l2_info(sd, "\tPulse width timer timed-out: %s\n",
997 stats & STATS_RTO ? "yes" : "no");
998 v4l2_info(sd, "\tPulse width timer time-out intr: %s\n",
999 irqen & IRQEN_RTE ? "enabled" : "disabled");
1000 v4l2_info(sd, "\tFIFO overrun: %s\n",
1001 stats & STATS_ROR ? "yes" : "no");
1002 v4l2_info(sd, "\tFIFO overrun interrupt: %s\n",
1003 irqen & IRQEN_ROE ? "enabled" : "disabled");
1004 v4l2_info(sd, "\tBusy: %s\n",
1005 stats & STATS_RBY ? "yes" : "no");
1006 v4l2_info(sd, "\tFIFO service requested: %s\n",
1007 stats & STATS_RSR ? "yes" : "no");
1008 v4l2_info(sd, "\tFIFO service request interrupt: %s\n",
1009 irqen & IRQEN_RSE ? "enabled" : "disabled");
1011 v4l2_info(sd, "IR Transmitter:\n");
1012 v4l2_info(sd, "\tEnabled: %s\n",
1013 cntrl & CNTRL_TXE ? "yes" : "no");
1014 v4l2_info(sd, "\tModulation onto a carrier: %s\n",
1015 cntrl & CNTRL_MOD ? "enabled" : "disabled");
1016 v4l2_info(sd, "\tFIFO: %s\n",
1017 cntrl & CNTRL_TFE ? "enabled" : "disabled");
1018 v4l2_info(sd, "\tFIFO interrupt watermark: %s\n",
1019 cntrl & CNTRL_TIC ? "not empty" : "half full or less");
1020 v4l2_info(sd, "\tSignal polarity: %s\n",
1021 cntrl & CNTRL_CPL ? "0:mark 1:space" : "0:space 1:mark");
1022 if (cntrl & CNTRL_MOD) {
1023 v4l2_info(sd, "\tCarrier (16 clocks): %u Hz\n",
1024 clock_divider_to_carrier_freq(txclk));
1025 v4l2_info(sd, "\tCarrier duty cycle: %2u/16\n",
1028 v4l2_info(sd, "\tMax pulse width: %u us, "
1030 pulse_width_count_to_us(FIFO_RXTX, txclk),
1031 pulse_width_count_to_ns(FIFO_RXTX, txclk));
1033 v4l2_info(sd, "\tBusy: %s\n",
1034 stats & STATS_TBY ? "yes" : "no");
1035 v4l2_info(sd, "\tFIFO service requested: %s\n",
1036 stats & STATS_TSR ? "yes" : "no");
1037 v4l2_info(sd, "\tFIFO service request interrupt: %s\n",
1038 irqen & IRQEN_TSE ? "enabled" : "disabled");
1043 static inline int cx23888_ir_dbg_match(const struct v4l2_dbg_match *match)
1045 return match->type == V4L2_CHIP_MATCH_HOST && match->addr == 2;
1048 static int cx23888_ir_g_chip_ident(struct v4l2_subdev *sd,
1049 struct v4l2_dbg_chip_ident *chip)
1051 struct cx23888_ir_state *state = to_state(sd);
1053 if (cx23888_ir_dbg_match(&chip->match)) {
1054 chip->ident = state->id;
1055 chip->revision = state->rev;
1060 #ifdef CONFIG_VIDEO_ADV_DEBUG
1061 static int cx23888_ir_g_register(struct v4l2_subdev *sd,
1062 struct v4l2_dbg_register *reg)
1064 struct cx23888_ir_state *state = to_state(sd);
1065 u32 addr = CX23888_IR_REG_BASE + (u32) reg->reg;
1067 if (!cx23888_ir_dbg_match(®->match))
1069 if ((addr & 0x3) != 0)
1071 if (addr < CX23888_IR_CNTRL_REG || addr > CX23888_IR_LEARN_REG)
1073 if (!capable(CAP_SYS_ADMIN))
1076 reg->val = cx23888_ir_read4(state->dev, addr);
1080 static int cx23888_ir_s_register(struct v4l2_subdev *sd,
1081 struct v4l2_dbg_register *reg)
1083 struct cx23888_ir_state *state = to_state(sd);
1084 u32 addr = CX23888_IR_REG_BASE + (u32) reg->reg;
1086 if (!cx23888_ir_dbg_match(®->match))
1088 if ((addr & 0x3) != 0)
1090 if (addr < CX23888_IR_CNTRL_REG || addr > CX23888_IR_LEARN_REG)
1092 if (!capable(CAP_SYS_ADMIN))
1094 cx23888_ir_write4(state->dev, addr, reg->val);
1099 static const struct v4l2_subdev_core_ops cx23888_ir_core_ops = {
1100 .g_chip_ident = cx23888_ir_g_chip_ident,
1101 .log_status = cx23888_ir_log_status,
1102 #ifdef CONFIG_VIDEO_ADV_DEBUG
1103 .g_register = cx23888_ir_g_register,
1104 .s_register = cx23888_ir_s_register,
1108 static const struct v4l2_subdev_ir_ops cx23888_ir_ir_ops = {
1109 .interrupt_service_routine = cx23888_ir_irq_handler,
1111 .rx_read = cx23888_ir_rx_read,
1112 .rx_g_parameters = cx23888_ir_rx_g_parameters,
1113 .rx_s_parameters = cx23888_ir_rx_s_parameters,
1115 .tx_write = cx23888_ir_tx_write,
1116 .tx_g_parameters = cx23888_ir_tx_g_parameters,
1117 .tx_s_parameters = cx23888_ir_tx_s_parameters,
1120 static const struct v4l2_subdev_ops cx23888_ir_controller_ops = {
1121 .core = &cx23888_ir_core_ops,
1122 .ir = &cx23888_ir_ir_ops,
1125 static const struct v4l2_subdev_ir_parameters default_rx_params = {
1126 .bytes_per_data_element = sizeof(u32),
1127 .mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
1130 .interrupt_enable = false,
1134 .carrier_freq = 36000, /* 36 kHz - RC-5, RC-6, and RC-6A carrier */
1136 /* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
1137 /* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
1138 .noise_filter_min_width = 333333, /* ns */
1139 .carrier_range_lower = 35000,
1140 .carrier_range_upper = 37000,
1144 static const struct v4l2_subdev_ir_parameters default_tx_params = {
1145 .bytes_per_data_element = sizeof(u32),
1146 .mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
1149 .interrupt_enable = false,
1153 .carrier_freq = 36000, /* 36 kHz - RC-5 carrier */
1154 .duty_cycle = 25, /* 25 % - RC-5 carrier */
1158 int cx23888_ir_probe(struct cx23885_dev *dev)
1160 struct cx23888_ir_state *state;
1161 struct v4l2_subdev *sd;
1162 struct v4l2_subdev_ir_parameters default_params;
1165 state = kzalloc(sizeof(struct cx23888_ir_state), GFP_KERNEL);
1169 spin_lock_init(&state->rx_kfifo_lock);
1170 state->rx_kfifo = kfifo_alloc(CX23888_IR_RX_KFIFO_SIZE, GFP_KERNEL,
1171 &state->rx_kfifo_lock);
1172 if (state->rx_kfifo == NULL)
1175 spin_lock_init(&state->tx_kfifo_lock);
1176 state->tx_kfifo = kfifo_alloc(CX23888_IR_TX_KFIFO_SIZE, GFP_KERNEL,
1177 &state->tx_kfifo_lock);
1178 if (state->tx_kfifo == NULL) {
1179 kfifo_free(state->rx_kfifo);
1184 state->id = V4L2_IDENT_CX23888_IR;
1188 v4l2_subdev_init(sd, &cx23888_ir_controller_ops);
1189 v4l2_set_subdevdata(sd, state);
1190 /* FIXME - fix the formatting of dev->v4l2_dev.name and use it */
1191 snprintf(sd->name, sizeof(sd->name), "%s/888-ir", dev->name);
1192 sd->grp_id = CX23885_HW_888_IR;
1194 ret = v4l2_device_register_subdev(&dev->v4l2_dev, sd);
1197 * Ensure no interrupts arrive from '888 specific conditions,
1198 * since we ignore them in this driver to have commonality with
1199 * similar IR controller cores.
1201 cx23888_ir_write4(dev, CX23888_IR_IRQEN_REG, 0);
1203 mutex_init(&state->rx_params_lock);
1204 memcpy(&default_params, &default_rx_params,
1205 sizeof(struct v4l2_subdev_ir_parameters));
1206 v4l2_subdev_call(sd, ir, rx_s_parameters, &default_params);
1208 mutex_init(&state->tx_params_lock);
1209 memcpy(&default_params, &default_tx_params,
1210 sizeof(struct v4l2_subdev_ir_parameters));
1211 v4l2_subdev_call(sd, ir, tx_s_parameters, &default_params);
1213 kfifo_free(state->rx_kfifo);
1214 kfifo_free(state->tx_kfifo);
1219 int cx23888_ir_remove(struct cx23885_dev *dev)
1221 struct v4l2_subdev *sd;
1222 struct cx23888_ir_state *state;
1224 sd = cx23885_find_hw(dev, CX23885_HW_888_IR);
1228 cx23888_ir_rx_shutdown(sd);
1229 cx23888_ir_tx_shutdown(sd);
1231 state = to_state(sd);
1232 v4l2_device_unregister_subdev(sd);
1233 kfifo_free(state->rx_kfifo);
1234 kfifo_free(state->tx_kfifo);
1236 /* Nothing more to free() as state held the actual v4l2_subdev object */