diff options
Diffstat (limited to 'drivers/media/pci/cx23885/cx23888-ir.c')
| -rw-r--r-- | drivers/media/pci/cx23885/cx23888-ir.c | 1205 |
1 files changed, 1205 insertions, 0 deletions
diff --git a/drivers/media/pci/cx23885/cx23888-ir.c b/drivers/media/pci/cx23885/cx23888-ir.c new file mode 100644 index 000000000..222d04421 --- /dev/null +++ b/drivers/media/pci/cx23885/cx23888-ir.c @@ -0,0 +1,1205 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for the Conexant CX23885/7/8 PCIe bridge + * + * CX23888 Integrated Consumer Infrared Controller + * + * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net> + */ + +#include "cx23885.h" +#include "cx23888-ir.h" + +#include <linux/kfifo.h> +#include <linux/slab.h> + +#include <media/v4l2-device.h> +#include <media/rc-core.h> + +static unsigned int ir_888_debug; +module_param(ir_888_debug, int, 0644); +MODULE_PARM_DESC(ir_888_debug, "enable debug messages [CX23888 IR controller]"); + +#define CX23888_IR_REG_BASE 0x170000 +/* + * These CX23888 register offsets have a straightforward one to one mapping + * to the CX23885 register offsets of 0x200 through 0x218 + */ +#define CX23888_IR_CNTRL_REG 0x170000 +#define CNTRL_WIN_3_3 0x00000000 +#define CNTRL_WIN_4_3 0x00000001 +#define CNTRL_WIN_3_4 0x00000002 +#define CNTRL_WIN_4_4 0x00000003 +#define CNTRL_WIN 0x00000003 +#define CNTRL_EDG_NONE 0x00000000 +#define CNTRL_EDG_FALL 0x00000004 +#define CNTRL_EDG_RISE 0x00000008 +#define CNTRL_EDG_BOTH 0x0000000C +#define CNTRL_EDG 0x0000000C +#define CNTRL_DMD 0x00000010 +#define CNTRL_MOD 0x00000020 +#define CNTRL_RFE 0x00000040 +#define CNTRL_TFE 0x00000080 +#define CNTRL_RXE 0x00000100 +#define CNTRL_TXE 0x00000200 +#define CNTRL_RIC 0x00000400 +#define CNTRL_TIC 0x00000800 +#define CNTRL_CPL 0x00001000 +#define CNTRL_LBM 0x00002000 +#define CNTRL_R 0x00004000 +/* CX23888 specific control flag */ +#define CNTRL_IVO 0x00008000 + +#define CX23888_IR_TXCLK_REG 0x170004 +#define TXCLK_TCD 0x0000FFFF + +#define CX23888_IR_RXCLK_REG 0x170008 +#define RXCLK_RCD 0x0000FFFF + +#define CX23888_IR_CDUTY_REG 0x17000C +#define CDUTY_CDC 0x0000000F + +#define CX23888_IR_STATS_REG 0x170010 +#define STATS_RTO 0x00000001 +#define STATS_ROR 0x00000002 +#define STATS_RBY 0x00000004 +#define STATS_TBY 0x00000008 +#define STATS_RSR 0x00000010 +#define STATS_TSR 0x00000020 + +#define CX23888_IR_IRQEN_REG 0x170014 +#define IRQEN_RTE 0x00000001 +#define IRQEN_ROE 0x00000002 +#define IRQEN_RSE 0x00000010 +#define IRQEN_TSE 0x00000020 + +#define CX23888_IR_FILTR_REG 0x170018 +#define FILTR_LPF 0x0000FFFF + +/* This register doesn't follow the pattern; it's 0x23C on a CX23885 */ +#define CX23888_IR_FIFO_REG 0x170040 +#define FIFO_RXTX 0x0000FFFF +#define FIFO_RXTX_LVL 0x00010000 +#define FIFO_RXTX_RTO 0x0001FFFF +#define FIFO_RX_NDV 0x00020000 +#define FIFO_RX_DEPTH 8 +#define FIFO_TX_DEPTH 8 + +/* CX23888 unique registers */ +#define CX23888_IR_SEEDP_REG 0x17001C +#define CX23888_IR_TIMOL_REG 0x170020 +#define CX23888_IR_WAKE0_REG 0x170024 +#define CX23888_IR_WAKE1_REG 0x170028 +#define CX23888_IR_WAKE2_REG 0x17002C +#define CX23888_IR_MASK0_REG 0x170030 +#define CX23888_IR_MASK1_REG 0x170034 +#define CX23888_IR_MAKS2_REG 0x170038 +#define CX23888_IR_DPIPG_REG 0x17003C +#define CX23888_IR_LEARN_REG 0x170044 + +#define CX23888_VIDCLK_FREQ 108000000 /* 108 MHz, BT.656 */ +#define CX23888_IR_REFCLK_FREQ (CX23888_VIDCLK_FREQ / 2) + +/* + * We use this union internally for convenience, but callers to tx_write + * and rx_read will be expecting records of type struct ir_raw_event. + * Always ensure the size of this union is dictated by struct ir_raw_event. + */ +union cx23888_ir_fifo_rec { + u32 hw_fifo_data; + struct ir_raw_event ir_core_data; +}; + +#define CX23888_IR_RX_KFIFO_SIZE (256 * sizeof(union cx23888_ir_fifo_rec)) +#define CX23888_IR_TX_KFIFO_SIZE (256 * sizeof(union cx23888_ir_fifo_rec)) + +struct cx23888_ir_state { + struct v4l2_subdev sd; + struct cx23885_dev *dev; + + struct v4l2_subdev_ir_parameters rx_params; + struct mutex rx_params_lock; + atomic_t rxclk_divider; + atomic_t rx_invert; + + struct kfifo rx_kfifo; + spinlock_t rx_kfifo_lock; + + struct v4l2_subdev_ir_parameters tx_params; + struct mutex tx_params_lock; + atomic_t txclk_divider; +}; + +static inline struct cx23888_ir_state *to_state(struct v4l2_subdev *sd) +{ + return v4l2_get_subdevdata(sd); +} + +/* + * IR register block read and write functions + */ +static +inline int cx23888_ir_write4(struct cx23885_dev *dev, u32 addr, u32 value) +{ + cx_write(addr, value); + return 0; +} + +static inline u32 cx23888_ir_read4(struct cx23885_dev *dev, u32 addr) +{ + return cx_read(addr); +} + +static inline int cx23888_ir_and_or4(struct cx23885_dev *dev, u32 addr, + u32 and_mask, u32 or_value) +{ + cx_andor(addr, ~and_mask, or_value); + return 0; +} + +/* + * Rx and Tx Clock Divider register computations + * + * Note the largest clock divider value of 0xffff corresponds to: + * (0xffff + 1) * 1000 / 108/2 MHz = 1,213,629.629... ns + * which fits in 21 bits, so we'll use unsigned int for time arguments. + */ +static inline u16 count_to_clock_divider(unsigned int d) +{ + if (d > RXCLK_RCD + 1) + d = RXCLK_RCD; + else if (d < 2) + d = 1; + else + d--; + return (u16) d; +} + +static inline u16 carrier_freq_to_clock_divider(unsigned int freq) +{ + return count_to_clock_divider( + DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, freq * 16)); +} + +static inline unsigned int clock_divider_to_carrier_freq(unsigned int divider) +{ + return DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, (divider + 1) * 16); +} + +static inline unsigned int clock_divider_to_freq(unsigned int divider, + unsigned int rollovers) +{ + return DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ, + (divider + 1) * rollovers); +} + +/* + * Low Pass Filter register calculations + * + * Note the largest count value of 0xffff corresponds to: + * 0xffff * 1000 / 108/2 MHz = 1,213,611.11... ns + * which fits in 21 bits, so we'll use unsigned int for time arguments. + */ +static inline u16 count_to_lpf_count(unsigned int d) +{ + if (d > FILTR_LPF) + d = FILTR_LPF; + else if (d < 4) + d = 0; + return (u16) d; +} + +static inline u16 ns_to_lpf_count(unsigned int ns) +{ + return count_to_lpf_count( + DIV_ROUND_CLOSEST(CX23888_IR_REFCLK_FREQ / 1000000 * ns, 1000)); +} + +static inline unsigned int lpf_count_to_ns(unsigned int count) +{ + /* Duration of the Low Pass Filter rejection window in ns */ + return DIV_ROUND_CLOSEST(count * 1000, + CX23888_IR_REFCLK_FREQ / 1000000); +} + +static inline unsigned int lpf_count_to_us(unsigned int count) +{ + /* Duration of the Low Pass Filter rejection window in us */ + return DIV_ROUND_CLOSEST(count, CX23888_IR_REFCLK_FREQ / 1000000); +} + +/* + * FIFO register pulse width count computations + */ +static u32 clock_divider_to_resolution(u16 divider) +{ + /* + * Resolution is the duration of 1 tick of the readable portion of + * the pulse width counter as read from the FIFO. The two lsb's are + * not readable, hence the << 2. This function returns ns. + */ + return DIV_ROUND_CLOSEST((1 << 2) * ((u32) divider + 1) * 1000, + CX23888_IR_REFCLK_FREQ / 1000000); +} + +static u64 pulse_width_count_to_ns(u16 count, u16 divider) +{ + u64 n; + u32 rem; + + /* + * The 2 lsb's of the pulse width timer count are not readable, hence + * the (count << 2) | 0x3 + */ + n = (((u64) count << 2) | 0x3) * (divider + 1) * 1000; /* millicycles */ + rem = do_div(n, CX23888_IR_REFCLK_FREQ / 1000000); /* / MHz => ns */ + if (rem >= CX23888_IR_REFCLK_FREQ / 1000000 / 2) + n++; + return n; +} + +static unsigned int pulse_width_count_to_us(u16 count, u16 divider) +{ + u64 n; + u32 rem; + + /* + * The 2 lsb's of the pulse width timer count are not readable, hence + * the (count << 2) | 0x3 + */ + n = (((u64) count << 2) | 0x3) * (divider + 1); /* cycles */ + rem = do_div(n, CX23888_IR_REFCLK_FREQ / 1000000); /* / MHz => us */ + if (rem >= CX23888_IR_REFCLK_FREQ / 1000000 / 2) + n++; + return (unsigned int) n; +} + +/* + * Pulse Clocks computations: Combined Pulse Width Count & Rx Clock Counts + * + * The total pulse clock count is an 18 bit pulse width timer count as the most + * significant part and (up to) 16 bit clock divider count as a modulus. + * When the Rx clock divider ticks down to 0, it increments the 18 bit pulse + * width timer count's least significant bit. + */ +static u64 ns_to_pulse_clocks(u32 ns) +{ + u64 clocks; + u32 rem; + clocks = CX23888_IR_REFCLK_FREQ / 1000000 * (u64) ns; /* millicycles */ + rem = do_div(clocks, 1000); /* /1000 = cycles */ + if (rem >= 1000 / 2) + clocks++; + return clocks; +} + +static u16 pulse_clocks_to_clock_divider(u64 count) +{ + do_div(count, (FIFO_RXTX << 2) | 0x3); + + /* net result needs to be rounded down and decremented by 1 */ + if (count > RXCLK_RCD + 1) + count = RXCLK_RCD; + else if (count < 2) + count = 1; + else + count--; + return (u16) count; +} + +/* + * IR Control Register helpers + */ +enum tx_fifo_watermark { + TX_FIFO_HALF_EMPTY = 0, + TX_FIFO_EMPTY = CNTRL_TIC, +}; + +enum rx_fifo_watermark { + RX_FIFO_HALF_FULL = 0, + RX_FIFO_NOT_EMPTY = CNTRL_RIC, +}; + +static inline void control_tx_irq_watermark(struct cx23885_dev *dev, + enum tx_fifo_watermark level) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_TIC, level); +} + +static inline void control_rx_irq_watermark(struct cx23885_dev *dev, + enum rx_fifo_watermark level) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_RIC, level); +} + +static inline void control_tx_enable(struct cx23885_dev *dev, bool enable) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~(CNTRL_TXE | CNTRL_TFE), + enable ? (CNTRL_TXE | CNTRL_TFE) : 0); +} + +static inline void control_rx_enable(struct cx23885_dev *dev, bool enable) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~(CNTRL_RXE | CNTRL_RFE), + enable ? (CNTRL_RXE | CNTRL_RFE) : 0); +} + +static inline void control_tx_modulation_enable(struct cx23885_dev *dev, + bool enable) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_MOD, + enable ? CNTRL_MOD : 0); +} + +static inline void control_rx_demodulation_enable(struct cx23885_dev *dev, + bool enable) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_DMD, + enable ? CNTRL_DMD : 0); +} + +static inline void control_rx_s_edge_detection(struct cx23885_dev *dev, + u32 edge_types) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_EDG_BOTH, + edge_types & CNTRL_EDG_BOTH); +} + +static void control_rx_s_carrier_window(struct cx23885_dev *dev, + unsigned int carrier, + unsigned int *carrier_range_low, + unsigned int *carrier_range_high) +{ + u32 v; + unsigned int c16 = carrier * 16; + + if (*carrier_range_low < DIV_ROUND_CLOSEST(c16, 16 + 3)) { + v = CNTRL_WIN_3_4; + *carrier_range_low = DIV_ROUND_CLOSEST(c16, 16 + 4); + } else { + v = CNTRL_WIN_3_3; + *carrier_range_low = DIV_ROUND_CLOSEST(c16, 16 + 3); + } + + if (*carrier_range_high > DIV_ROUND_CLOSEST(c16, 16 - 3)) { + v |= CNTRL_WIN_4_3; + *carrier_range_high = DIV_ROUND_CLOSEST(c16, 16 - 4); + } else { + v |= CNTRL_WIN_3_3; + *carrier_range_high = DIV_ROUND_CLOSEST(c16, 16 - 3); + } + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_WIN, v); +} + +static inline void control_tx_polarity_invert(struct cx23885_dev *dev, + bool invert) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_CPL, + invert ? CNTRL_CPL : 0); +} + +static inline void control_tx_level_invert(struct cx23885_dev *dev, + bool invert) +{ + cx23888_ir_and_or4(dev, CX23888_IR_CNTRL_REG, ~CNTRL_IVO, + invert ? CNTRL_IVO : 0); +} + +/* + * IR Rx & Tx Clock Register helpers + */ +static unsigned int txclk_tx_s_carrier(struct cx23885_dev *dev, + unsigned int freq, + u16 *divider) +{ + *divider = carrier_freq_to_clock_divider(freq); + cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, *divider); + return clock_divider_to_carrier_freq(*divider); +} + +static unsigned int rxclk_rx_s_carrier(struct cx23885_dev *dev, + unsigned int freq, + u16 *divider) +{ + *divider = carrier_freq_to_clock_divider(freq); + cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, *divider); + return clock_divider_to_carrier_freq(*divider); +} + +static u32 txclk_tx_s_max_pulse_width(struct cx23885_dev *dev, u32 ns, + u16 *divider) +{ + u64 pulse_clocks; + + if (ns > IR_MAX_DURATION) + ns = IR_MAX_DURATION; + pulse_clocks = ns_to_pulse_clocks(ns); + *divider = pulse_clocks_to_clock_divider(pulse_clocks); + cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, *divider); + return (u32) pulse_width_count_to_ns(FIFO_RXTX, *divider); +} + +static u32 rxclk_rx_s_max_pulse_width(struct cx23885_dev *dev, u32 ns, + u16 *divider) +{ + u64 pulse_clocks; + + if (ns > IR_MAX_DURATION) + ns = IR_MAX_DURATION; + pulse_clocks = ns_to_pulse_clocks(ns); + *divider = pulse_clocks_to_clock_divider(pulse_clocks); + cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, *divider); + return (u32) pulse_width_count_to_ns(FIFO_RXTX, *divider); +} + +/* + * IR Tx Carrier Duty Cycle register helpers + */ +static unsigned int cduty_tx_s_duty_cycle(struct cx23885_dev *dev, + unsigned int duty_cycle) +{ + u32 n; + n = DIV_ROUND_CLOSEST(duty_cycle * 100, 625); /* 16ths of 100% */ + if (n != 0) + n--; + if (n > 15) + n = 15; + cx23888_ir_write4(dev, CX23888_IR_CDUTY_REG, n); + return DIV_ROUND_CLOSEST((n + 1) * 100, 16); +} + +/* + * IR Filter Register helpers + */ +static u32 filter_rx_s_min_width(struct cx23885_dev *dev, u32 min_width_ns) +{ + u32 count = ns_to_lpf_count(min_width_ns); + cx23888_ir_write4(dev, CX23888_IR_FILTR_REG, count); + return lpf_count_to_ns(count); +} + +/* + * IR IRQ Enable Register helpers + */ +static inline void irqenable_rx(struct cx23885_dev *dev, u32 mask) +{ + mask &= (IRQEN_RTE | IRQEN_ROE | IRQEN_RSE); + cx23888_ir_and_or4(dev, CX23888_IR_IRQEN_REG, + ~(IRQEN_RTE | IRQEN_ROE | IRQEN_RSE), mask); +} + +static inline void irqenable_tx(struct cx23885_dev *dev, u32 mask) +{ + mask &= IRQEN_TSE; + cx23888_ir_and_or4(dev, CX23888_IR_IRQEN_REG, ~IRQEN_TSE, mask); +} + +/* + * V4L2 Subdevice IR Ops + */ +static int cx23888_ir_irq_handler(struct v4l2_subdev *sd, u32 status, + bool *handled) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + unsigned long flags; + + u32 cntrl = cx23888_ir_read4(dev, CX23888_IR_CNTRL_REG); + u32 irqen = cx23888_ir_read4(dev, CX23888_IR_IRQEN_REG); + u32 stats = cx23888_ir_read4(dev, CX23888_IR_STATS_REG); + + union cx23888_ir_fifo_rec rx_data[FIFO_RX_DEPTH]; + unsigned int i, j, k; + u32 events, v; + int tsr, rsr, rto, ror, tse, rse, rte, roe, kror; + + tsr = stats & STATS_TSR; /* Tx FIFO Service Request */ + rsr = stats & STATS_RSR; /* Rx FIFO Service Request */ + rto = stats & STATS_RTO; /* Rx Pulse Width Timer Time Out */ + ror = stats & STATS_ROR; /* Rx FIFO Over Run */ + + tse = irqen & IRQEN_TSE; /* Tx FIFO Service Request IRQ Enable */ + rse = irqen & IRQEN_RSE; /* Rx FIFO Service Request IRQ Enable */ + rte = irqen & IRQEN_RTE; /* Rx Pulse Width Timer Time Out IRQ Enable */ + roe = irqen & IRQEN_ROE; /* Rx FIFO Over Run IRQ Enable */ + + *handled = false; + v4l2_dbg(2, ir_888_debug, sd, "IRQ Status: %s %s %s %s %s %s\n", + tsr ? "tsr" : " ", rsr ? "rsr" : " ", + rto ? "rto" : " ", ror ? "ror" : " ", + stats & STATS_TBY ? "tby" : " ", + stats & STATS_RBY ? "rby" : " "); + + v4l2_dbg(2, ir_888_debug, sd, "IRQ Enables: %s %s %s %s\n", + tse ? "tse" : " ", rse ? "rse" : " ", + rte ? "rte" : " ", roe ? "roe" : " "); + + /* + * Transmitter interrupt service + */ + if (tse && tsr) { + /* + * TODO: + * Check the watermark threshold setting + * Pull FIFO_TX_DEPTH or FIFO_TX_DEPTH/2 entries from tx_kfifo + * Push the data to the hardware FIFO. + * If there was nothing more to send in the tx_kfifo, disable + * the TSR IRQ and notify the v4l2_device. + * If there was something in the tx_kfifo, check the tx_kfifo + * level and notify the v4l2_device, if it is low. + */ + /* For now, inhibit TSR interrupt until Tx is implemented */ + irqenable_tx(dev, 0); + events = V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ; + v4l2_subdev_notify(sd, V4L2_SUBDEV_IR_TX_NOTIFY, &events); + *handled = true; + } + + /* + * Receiver interrupt service + */ + kror = 0; + if ((rse && rsr) || (rte && rto)) { + /* + * Receive data on RSR to clear the STATS_RSR. + * Receive data on RTO, since we may not have yet hit the RSR + * watermark when we receive the RTO. + */ + for (i = 0, v = FIFO_RX_NDV; + (v & FIFO_RX_NDV) && !kror; i = 0) { + for (j = 0; + (v & FIFO_RX_NDV) && j < FIFO_RX_DEPTH; j++) { + v = cx23888_ir_read4(dev, CX23888_IR_FIFO_REG); + rx_data[i].hw_fifo_data = v & ~FIFO_RX_NDV; + i++; + } + if (i == 0) + break; + j = i * sizeof(union cx23888_ir_fifo_rec); + k = kfifo_in_locked(&state->rx_kfifo, + (unsigned char *) rx_data, j, + &state->rx_kfifo_lock); + if (k != j) + kror++; /* rx_kfifo over run */ + } + *handled = true; + } + + events = 0; + v = 0; + if (kror) { + events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN; + v4l2_err(sd, "IR receiver software FIFO overrun\n"); + } + if (roe && ror) { + /* + * The RX FIFO Enable (CNTRL_RFE) must be toggled to clear + * the Rx FIFO Over Run status (STATS_ROR) + */ + v |= CNTRL_RFE; + events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN; + v4l2_err(sd, "IR receiver hardware FIFO overrun\n"); + } + if (rte && rto) { + /* + * The IR Receiver Enable (CNTRL_RXE) must be toggled to clear + * the Rx Pulse Width Timer Time Out (STATS_RTO) + */ + v |= CNTRL_RXE; + events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED; + } + if (v) { + /* Clear STATS_ROR & STATS_RTO as needed by resetting hardware */ + cx23888_ir_write4(dev, CX23888_IR_CNTRL_REG, cntrl & ~v); + cx23888_ir_write4(dev, CX23888_IR_CNTRL_REG, cntrl); + *handled = true; + } + + spin_lock_irqsave(&state->rx_kfifo_lock, flags); + if (kfifo_len(&state->rx_kfifo) >= CX23888_IR_RX_KFIFO_SIZE / 2) + events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ; + spin_unlock_irqrestore(&state->rx_kfifo_lock, flags); + + if (events) + v4l2_subdev_notify(sd, V4L2_SUBDEV_IR_RX_NOTIFY, &events); + return 0; +} + +/* Receiver */ +static int cx23888_ir_rx_read(struct v4l2_subdev *sd, u8 *buf, size_t count, + ssize_t *num) +{ + struct cx23888_ir_state *state = to_state(sd); + bool invert = (bool) atomic_read(&state->rx_invert); + u16 divider = (u16) atomic_read(&state->rxclk_divider); + + unsigned int i, n; + union cx23888_ir_fifo_rec *p; + unsigned u, v, w; + + n = count / sizeof(union cx23888_ir_fifo_rec) + * sizeof(union cx23888_ir_fifo_rec); + if (n == 0) { + *num = 0; + return 0; + } + + n = kfifo_out_locked(&state->rx_kfifo, buf, n, &state->rx_kfifo_lock); + + n /= sizeof(union cx23888_ir_fifo_rec); + *num = n * sizeof(union cx23888_ir_fifo_rec); + + for (p = (union cx23888_ir_fifo_rec *) buf, i = 0; i < n; p++, i++) { + + if ((p->hw_fifo_data & FIFO_RXTX_RTO) == FIFO_RXTX_RTO) { + /* Assume RTO was because of no IR light input */ + u = 0; + w = 1; + } else { + u = (p->hw_fifo_data & FIFO_RXTX_LVL) ? 1 : 0; + if (invert) + u = u ? 0 : 1; + w = 0; + } + + v = (unsigned) pulse_width_count_to_ns( + (u16)(p->hw_fifo_data & FIFO_RXTX), divider) / 1000; + if (v > IR_MAX_DURATION) + v = IR_MAX_DURATION; + + p->ir_core_data = (struct ir_raw_event) + { .pulse = u, .duration = v, .timeout = w }; + + v4l2_dbg(2, ir_888_debug, sd, "rx read: %10u ns %s %s\n", + v, u ? "mark" : "space", w ? "(timed out)" : ""); + if (w) + v4l2_dbg(2, ir_888_debug, sd, "rx read: end of rx\n"); + } + return 0; +} + +static int cx23888_ir_rx_g_parameters(struct v4l2_subdev *sd, + struct v4l2_subdev_ir_parameters *p) +{ + struct cx23888_ir_state *state = to_state(sd); + mutex_lock(&state->rx_params_lock); + memcpy(p, &state->rx_params, sizeof(struct v4l2_subdev_ir_parameters)); + mutex_unlock(&state->rx_params_lock); + return 0; +} + +static int cx23888_ir_rx_shutdown(struct v4l2_subdev *sd) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + + mutex_lock(&state->rx_params_lock); + + /* Disable or slow down all IR Rx circuits and counters */ + irqenable_rx(dev, 0); + control_rx_enable(dev, false); + control_rx_demodulation_enable(dev, false); + control_rx_s_edge_detection(dev, CNTRL_EDG_NONE); + filter_rx_s_min_width(dev, 0); + cx23888_ir_write4(dev, CX23888_IR_RXCLK_REG, RXCLK_RCD); + + state->rx_params.shutdown = true; + + mutex_unlock(&state->rx_params_lock); + return 0; +} + +static int cx23888_ir_rx_s_parameters(struct v4l2_subdev *sd, + struct v4l2_subdev_ir_parameters *p) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + struct v4l2_subdev_ir_parameters *o = &state->rx_params; + u16 rxclk_divider; + + if (p->shutdown) + return cx23888_ir_rx_shutdown(sd); + + if (p->mode != V4L2_SUBDEV_IR_MODE_PULSE_WIDTH) + return -ENOSYS; + + mutex_lock(&state->rx_params_lock); + + o->shutdown = p->shutdown; + + o->mode = p->mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH; + + o->bytes_per_data_element = p->bytes_per_data_element + = sizeof(union cx23888_ir_fifo_rec); + + /* Before we tweak the hardware, we have to disable the receiver */ + irqenable_rx(dev, 0); + control_rx_enable(dev, false); + + control_rx_demodulation_enable(dev, p->modulation); + o->modulation = p->modulation; + + if (p->modulation) { + p->carrier_freq = rxclk_rx_s_carrier(dev, p->carrier_freq, + &rxclk_divider); + + o->carrier_freq = p->carrier_freq; + + o->duty_cycle = p->duty_cycle = 50; + + control_rx_s_carrier_window(dev, p->carrier_freq, + &p->carrier_range_lower, + &p->carrier_range_upper); + o->carrier_range_lower = p->carrier_range_lower; + o->carrier_range_upper = p->carrier_range_upper; + + p->max_pulse_width = + (u32) pulse_width_count_to_ns(FIFO_RXTX, rxclk_divider); + } else { + p->max_pulse_width = + rxclk_rx_s_max_pulse_width(dev, p->max_pulse_width, + &rxclk_divider); + } + o->max_pulse_width = p->max_pulse_width; + atomic_set(&state->rxclk_divider, rxclk_divider); + + p->noise_filter_min_width = + filter_rx_s_min_width(dev, p->noise_filter_min_width); + o->noise_filter_min_width = p->noise_filter_min_width; + + p->resolution = clock_divider_to_resolution(rxclk_divider); + o->resolution = p->resolution; + + /* FIXME - make this dependent on resolution for better performance */ + control_rx_irq_watermark(dev, RX_FIFO_HALF_FULL); + + control_rx_s_edge_detection(dev, CNTRL_EDG_BOTH); + + o->invert_level = p->invert_level; + atomic_set(&state->rx_invert, p->invert_level); + + o->interrupt_enable = p->interrupt_enable; + o->enable = p->enable; + if (p->enable) { + unsigned long flags; + + spin_lock_irqsave(&state->rx_kfifo_lock, flags); + kfifo_reset(&state->rx_kfifo); + /* reset tx_fifo too if there is one... */ + spin_unlock_irqrestore(&state->rx_kfifo_lock, flags); + if (p->interrupt_enable) + irqenable_rx(dev, IRQEN_RSE | IRQEN_RTE | IRQEN_ROE); + control_rx_enable(dev, p->enable); + } + + mutex_unlock(&state->rx_params_lock); + return 0; +} + +/* Transmitter */ +static int cx23888_ir_tx_write(struct v4l2_subdev *sd, u8 *buf, size_t count, + ssize_t *num) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + /* For now enable the Tx FIFO Service interrupt & pretend we did work */ + irqenable_tx(dev, IRQEN_TSE); + *num = count; + return 0; +} + +static int cx23888_ir_tx_g_parameters(struct v4l2_subdev *sd, + struct v4l2_subdev_ir_parameters *p) +{ + struct cx23888_ir_state *state = to_state(sd); + mutex_lock(&state->tx_params_lock); + memcpy(p, &state->tx_params, sizeof(struct v4l2_subdev_ir_parameters)); + mutex_unlock(&state->tx_params_lock); + return 0; +} + +static int cx23888_ir_tx_shutdown(struct v4l2_subdev *sd) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + + mutex_lock(&state->tx_params_lock); + + /* Disable or slow down all IR Tx circuits and counters */ + irqenable_tx(dev, 0); + control_tx_enable(dev, false); + control_tx_modulation_enable(dev, false); + cx23888_ir_write4(dev, CX23888_IR_TXCLK_REG, TXCLK_TCD); + + state->tx_params.shutdown = true; + + mutex_unlock(&state->tx_params_lock); + return 0; +} + +static int cx23888_ir_tx_s_parameters(struct v4l2_subdev *sd, + struct v4l2_subdev_ir_parameters *p) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + struct v4l2_subdev_ir_parameters *o = &state->tx_params; + u16 txclk_divider; + + if (p->shutdown) + return cx23888_ir_tx_shutdown(sd); + + if (p->mode != V4L2_SUBDEV_IR_MODE_PULSE_WIDTH) + return -ENOSYS; + + mutex_lock(&state->tx_params_lock); + + o->shutdown = p->shutdown; + + o->mode = p->mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH; + + o->bytes_per_data_element = p->bytes_per_data_element + = sizeof(union cx23888_ir_fifo_rec); + + /* Before we tweak the hardware, we have to disable the transmitter */ + irqenable_tx(dev, 0); + control_tx_enable(dev, false); + + control_tx_modulation_enable(dev, p->modulation); + o->modulation = p->modulation; + + if (p->modulation) { + p->carrier_freq = txclk_tx_s_carrier(dev, p->carrier_freq, + &txclk_divider); + o->carrier_freq = p->carrier_freq; + + p->duty_cycle = cduty_tx_s_duty_cycle(dev, p->duty_cycle); + o->duty_cycle = p->duty_cycle; + + p->max_pulse_width = + (u32) pulse_width_count_to_ns(FIFO_RXTX, txclk_divider); + } else { + p->max_pulse_width = + txclk_tx_s_max_pulse_width(dev, p->max_pulse_width, + &txclk_divider); + } + o->max_pulse_width = p->max_pulse_width; + atomic_set(&state->txclk_divider, txclk_divider); + + p->resolution = clock_divider_to_resolution(txclk_divider); + o->resolution = p->resolution; + + /* FIXME - make this dependent on resolution for better performance */ + control_tx_irq_watermark(dev, TX_FIFO_HALF_EMPTY); + + control_tx_polarity_invert(dev, p->invert_carrier_sense); + o->invert_carrier_sense = p->invert_carrier_sense; + + control_tx_level_invert(dev, p->invert_level); + o->invert_level = p->invert_level; + + o->interrupt_enable = p->interrupt_enable; + o->enable = p->enable; + if (p->enable) { + if (p->interrupt_enable) + irqenable_tx(dev, IRQEN_TSE); + control_tx_enable(dev, p->enable); + } + + mutex_unlock(&state->tx_params_lock); + return 0; +} + + +/* + * V4L2 Subdevice Core Ops + */ +static int cx23888_ir_log_status(struct v4l2_subdev *sd) +{ + struct cx23888_ir_state *state = to_state(sd); + struct cx23885_dev *dev = state->dev; + char *s; + int i, j; + + u32 cntrl = cx23888_ir_read4(dev, CX23888_IR_CNTRL_REG); + u32 txclk = cx23888_ir_read4(dev, CX23888_IR_TXCLK_REG) & TXCLK_TCD; + u32 rxclk = cx23888_ir_read4(dev, CX23888_IR_RXCLK_REG) & RXCLK_RCD; + u32 cduty = cx23888_ir_read4(dev, CX23888_IR_CDUTY_REG) & CDUTY_CDC; + u32 stats = cx23888_ir_read4(dev, CX23888_IR_STATS_REG); + u32 irqen = cx23888_ir_read4(dev, CX23888_IR_IRQEN_REG); + u32 filtr = cx23888_ir_read4(dev, CX23888_IR_FILTR_REG) & FILTR_LPF; + + v4l2_info(sd, "IR Receiver:\n"); + v4l2_info(sd, "\tEnabled: %s\n", + cntrl & CNTRL_RXE ? "yes" : "no"); + v4l2_info(sd, "\tDemodulation from a carrier: %s\n", + cntrl & CNTRL_DMD ? "enabled" : "disabled"); + v4l2_info(sd, "\tFIFO: %s\n", + cntrl & CNTRL_RFE ? "enabled" : "disabled"); + switch (cntrl & CNTRL_EDG) { + case CNTRL_EDG_NONE: + s = "disabled"; + break; + case CNTRL_EDG_FALL: + s = "falling edge"; + break; + case CNTRL_EDG_RISE: + s = "rising edge"; + break; + case CNTRL_EDG_BOTH: + s = "rising & falling edges"; + break; + default: + s = "??? edge"; + break; + } + v4l2_info(sd, "\tPulse timers' start/stop trigger: %s\n", s); + v4l2_info(sd, "\tFIFO data on pulse timer overflow: %s\n", + cntrl & CNTRL_R ? "not loaded" : "overflow marker"); + v4l2_info(sd, "\tFIFO interrupt watermark: %s\n", + cntrl & CNTRL_RIC ? "not empty" : "half full or greater"); + v4l2_info(sd, "\tLoopback mode: %s\n", + cntrl & CNTRL_LBM ? "loopback active" : "normal receive"); + if (cntrl & CNTRL_DMD) { + v4l2_info(sd, "\tExpected carrier (16 clocks): %u Hz\n", + clock_divider_to_carrier_freq(rxclk)); + switch (cntrl & CNTRL_WIN) { + case CNTRL_WIN_3_3: + i = 3; + j = 3; + break; + case CNTRL_WIN_4_3: + i = 4; + j = 3; + break; + case CNTRL_WIN_3_4: + i = 3; + j = 4; + break; + case CNTRL_WIN_4_4: + i = 4; + j = 4; + break; + default: + i = 0; + j = 0; + break; + } + v4l2_info(sd, "\tNext carrier edge window: 16 clocks -%1d/+%1d, %u to %u Hz\n", + i, j, + clock_divider_to_freq(rxclk, 16 + j), + clock_divider_to_freq(rxclk, 16 - i)); + } + v4l2_info(sd, "\tMax measurable pulse width: %u us, %llu ns\n", + pulse_width_count_to_us(FIFO_RXTX, rxclk), + pulse_width_count_to_ns(FIFO_RXTX, rxclk)); + v4l2_info(sd, "\tLow pass filter: %s\n", + filtr ? "enabled" : "disabled"); + if (filtr) + v4l2_info(sd, "\tMin acceptable pulse width (LPF): %u us, %u ns\n", + lpf_count_to_us(filtr), + lpf_count_to_ns(filtr)); + v4l2_info(sd, "\tPulse width timer timed-out: %s\n", + stats & STATS_RTO ? "yes" : "no"); + v4l2_info(sd, "\tPulse width timer time-out intr: %s\n", + irqen & IRQEN_RTE ? "enabled" : "disabled"); + v4l2_info(sd, "\tFIFO overrun: %s\n", + stats & STATS_ROR ? "yes" : "no"); + v4l2_info(sd, "\tFIFO overrun interrupt: %s\n", + irqen & IRQEN_ROE ? "enabled" : "disabled"); + v4l2_info(sd, "\tBusy: %s\n", + stats & STATS_RBY ? "yes" : "no"); + v4l2_info(sd, "\tFIFO service requested: %s\n", + stats & STATS_RSR ? "yes" : "no"); + v4l2_info(sd, "\tFIFO service request interrupt: %s\n", + irqen & IRQEN_RSE ? "enabled" : "disabled"); + + v4l2_info(sd, "IR Transmitter:\n"); + v4l2_info(sd, "\tEnabled: %s\n", + cntrl & CNTRL_TXE ? "yes" : "no"); + v4l2_info(sd, "\tModulation onto a carrier: %s\n", + cntrl & CNTRL_MOD ? "enabled" : "disabled"); + v4l2_info(sd, "\tFIFO: %s\n", + cntrl & CNTRL_TFE ? "enabled" : "disabled"); + v4l2_info(sd, "\tFIFO interrupt watermark: %s\n", + cntrl & CNTRL_TIC ? "not empty" : "half full or less"); + v4l2_info(sd, "\tOutput pin level inversion %s\n", + cntrl & CNTRL_IVO ? "yes" : "no"); + v4l2_info(sd, "\tCarrier polarity: %s\n", + cntrl & CNTRL_CPL ? "space:burst mark:noburst" + : "space:noburst mark:burst"); + if (cntrl & CNTRL_MOD) { + v4l2_info(sd, "\tCarrier (16 clocks): %u Hz\n", + clock_divider_to_carrier_freq(txclk)); + v4l2_info(sd, "\tCarrier duty cycle: %2u/16\n", + cduty + 1); + } + v4l2_info(sd, "\tMax pulse width: %u us, %llu ns\n", + pulse_width_count_to_us(FIFO_RXTX, txclk), + pulse_width_count_to_ns(FIFO_RXTX, txclk)); + v4l2_info(sd, "\tBusy: %s\n", + stats & STATS_TBY ? "yes" : "no"); + v4l2_info(sd, "\tFIFO service requested: %s\n", + stats & STATS_TSR ? "yes" : "no"); + v4l2_info(sd, "\tFIFO service request interrupt: %s\n", + irqen & IRQEN_TSE ? "enabled" : "disabled"); + + return 0; +} + +#ifdef CONFIG_VIDEO_ADV_DEBUG +static int cx23888_ir_g_register(struct v4l2_subdev *sd, + struct v4l2_dbg_register *reg) +{ + struct cx23888_ir_state *state = to_state(sd); + u32 addr = CX23888_IR_REG_BASE + (u32) reg->reg; + + if ((addr & 0x3) != 0) + return -EINVAL; + if (addr < CX23888_IR_CNTRL_REG || addr > CX23888_IR_LEARN_REG) + return -EINVAL; + reg->size = 4; + reg->val = cx23888_ir_read4(state->dev, addr); + return 0; +} + +static int cx23888_ir_s_register(struct v4l2_subdev *sd, + const struct v4l2_dbg_register *reg) +{ + struct cx23888_ir_state *state = to_state(sd); + u32 addr = CX23888_IR_REG_BASE + (u32) reg->reg; + + if ((addr & 0x3) != 0) + return -EINVAL; + if (addr < CX23888_IR_CNTRL_REG || addr > CX23888_IR_LEARN_REG) + return -EINVAL; + cx23888_ir_write4(state->dev, addr, reg->val); + return 0; +} +#endif + +static const struct v4l2_subdev_core_ops cx23888_ir_core_ops = { + .log_status = cx23888_ir_log_status, +#ifdef CONFIG_VIDEO_ADV_DEBUG + .g_register = cx23888_ir_g_register, + .s_register = cx23888_ir_s_register, +#endif + .interrupt_service_routine = cx23888_ir_irq_handler, +}; + +static const struct v4l2_subdev_ir_ops cx23888_ir_ir_ops = { + .rx_read = cx23888_ir_rx_read, + .rx_g_parameters = cx23888_ir_rx_g_parameters, + .rx_s_parameters = cx23888_ir_rx_s_parameters, + + .tx_write = cx23888_ir_tx_write, + .tx_g_parameters = cx23888_ir_tx_g_parameters, + .tx_s_parameters = cx23888_ir_tx_s_parameters, +}; + +static const struct v4l2_subdev_ops cx23888_ir_controller_ops = { + .core = &cx23888_ir_core_ops, + .ir = &cx23888_ir_ir_ops, +}; + +static const struct v4l2_subdev_ir_parameters default_rx_params = { + .bytes_per_data_element = sizeof(union cx23888_ir_fifo_rec), + .mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, + + .enable = false, + .interrupt_enable = false, + .shutdown = true, + + .modulation = true, + .carrier_freq = 36000, /* 36 kHz - RC-5, RC-6, and RC-6A carrier */ + + /* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */ + /* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */ + .noise_filter_min_width = 333333, /* ns */ + .carrier_range_lower = 35000, + .carrier_range_upper = 37000, + .invert_level = false, +}; + +static const struct v4l2_subdev_ir_parameters default_tx_params = { + .bytes_per_data_element = sizeof(union cx23888_ir_fifo_rec), + .mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, + + .enable = false, + .interrupt_enable = false, + .shutdown = true, + + .modulation = true, + .carrier_freq = 36000, /* 36 kHz - RC-5 carrier */ + .duty_cycle = 25, /* 25 % - RC-5 carrier */ + .invert_level = false, + .invert_carrier_sense = false, +}; + +int cx23888_ir_probe(struct cx23885_dev *dev) +{ + struct cx23888_ir_state *state; + struct v4l2_subdev *sd; + struct v4l2_subdev_ir_parameters default_params; + int ret; + + state = kzalloc(sizeof(struct cx23888_ir_state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + + spin_lock_init(&state->rx_kfifo_lock); + if (kfifo_alloc(&state->rx_kfifo, CX23888_IR_RX_KFIFO_SIZE, + GFP_KERNEL)) { + kfree(state); + return -ENOMEM; + } + + state->dev = dev; + sd = &state->sd; + + v4l2_subdev_init(sd, &cx23888_ir_controller_ops); + v4l2_set_subdevdata(sd, state); + /* FIXME - fix the formatting of dev->v4l2_dev.name and use it */ + snprintf(sd->name, sizeof(sd->name), "%s/888-ir", dev->name); + sd->grp_id = CX23885_HW_888_IR; + + ret = v4l2_device_register_subdev(&dev->v4l2_dev, sd); + if (ret == 0) { + /* + * Ensure no interrupts arrive from '888 specific conditions, + * since we ignore them in this driver to have commonality with + * similar IR controller cores. + */ + cx23888_ir_write4(dev, CX23888_IR_IRQEN_REG, 0); + + mutex_init(&state->rx_params_lock); + default_params = default_rx_params; + v4l2_subdev_call(sd, ir, rx_s_parameters, &default_params); + + mutex_init(&state->tx_params_lock); + default_params = default_tx_params; + v4l2_subdev_call(sd, ir, tx_s_parameters, &default_params); + } else { + kfifo_free(&state->rx_kfifo); + } + return ret; +} + +int cx23888_ir_remove(struct cx23885_dev *dev) +{ + struct v4l2_subdev *sd; + struct cx23888_ir_state *state; + + sd = cx23885_find_hw(dev, CX23885_HW_888_IR); + if (sd == NULL) + return -ENODEV; + + cx23888_ir_rx_shutdown(sd); + cx23888_ir_tx_shutdown(sd); + + state = to_state(sd); + v4l2_device_unregister_subdev(sd); + kfifo_free(&state->rx_kfifo); + kfree(state); + /* Nothing more to free() as state held the actual v4l2_subdev object */ + return 0; +} |