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![Hans Verkuil](/assets/img/avatar_default.png)
The current CEC pin value (0 or 1) was part of the cec_pin struct, but that assumes that CEC pin monitoring can only be used with a driver that uses the low-level CEC pin framework. But hardware that has both a high-level API and can monitor the CEC pin at low-level at the same time does not need to depend on the cec pin framework. To support such devices remove the cur_value field from struct cec_pin and add a cec_pin_is_high field to cec_adapter. This also makes it possible to drop the '#ifdef CONFIG_CEC_PIN' in cec-api.c. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
186 lines
5.6 KiB
C
186 lines
5.6 KiB
C
/*
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* cec-pin.h - low-level CEC pin control
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*
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* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef LINUX_CEC_PIN_H
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#define LINUX_CEC_PIN_H
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#include <linux/types.h>
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#include <linux/atomic.h>
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#include <media/cec.h>
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enum cec_pin_state {
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/* CEC is off */
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CEC_ST_OFF,
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/* CEC is idle, waiting for Rx or Tx */
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CEC_ST_IDLE,
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/* Tx states */
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/* Pending Tx, waiting for Signal Free Time to expire */
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CEC_ST_TX_WAIT,
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/* Low-drive was detected, wait for bus to go high */
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CEC_ST_TX_WAIT_FOR_HIGH,
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/* Drive CEC low for the start bit */
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CEC_ST_TX_START_BIT_LOW,
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/* Drive CEC high for the start bit */
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CEC_ST_TX_START_BIT_HIGH,
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/* Drive CEC low for the 0 bit */
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CEC_ST_TX_DATA_BIT_0_LOW,
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/* Drive CEC high for the 0 bit */
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CEC_ST_TX_DATA_BIT_0_HIGH,
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/* Drive CEC low for the 1 bit */
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CEC_ST_TX_DATA_BIT_1_LOW,
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/* Drive CEC high for the 1 bit */
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CEC_ST_TX_DATA_BIT_1_HIGH,
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/*
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* Wait for start of sample time to check for Ack bit or first
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* four initiator bits to check for Arbitration Lost.
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*/
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CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE,
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/* Wait for end of bit period after sampling */
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CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE,
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/* Rx states */
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/* Start bit low detected */
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CEC_ST_RX_START_BIT_LOW,
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/* Start bit high detected */
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CEC_ST_RX_START_BIT_HIGH,
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/* Wait for bit sample time */
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CEC_ST_RX_DATA_SAMPLE,
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/* Wait for earliest end of bit period after sampling */
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CEC_ST_RX_DATA_POST_SAMPLE,
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/* Wait for CEC to go high (i.e. end of bit period */
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CEC_ST_RX_DATA_HIGH,
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/* Drive CEC low to send 0 Ack bit */
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CEC_ST_RX_ACK_LOW,
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/* End of 0 Ack time, wait for earliest end of bit period */
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CEC_ST_RX_ACK_LOW_POST,
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/* Wait for CEC to go high (i.e. end of bit period */
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CEC_ST_RX_ACK_HIGH_POST,
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/* Wait for earliest end of bit period and end of message */
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CEC_ST_RX_ACK_FINISH,
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/* Start low drive */
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CEC_ST_LOW_DRIVE,
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/* Monitor pin using interrupts */
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CEC_ST_RX_IRQ,
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/* Total number of pin states */
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CEC_PIN_STATES
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};
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/**
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* struct cec_pin_ops - low-level CEC pin operations
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* @read: read the CEC pin. Return true if high, false if low.
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* @low: drive the CEC pin low.
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* @high: stop driving the CEC pin. The pull-up will drive the pin
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* high, unless someone else is driving the pin low.
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* @enable_irq: optional, enable the interrupt to detect pin voltage changes.
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* @disable_irq: optional, disable the interrupt.
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* @free: optional. Free any allocated resources. Called when the
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* adapter is deleted.
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* @status: optional, log status information.
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*
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* These operations are used by the cec pin framework to manipulate
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* the CEC pin.
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*/
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struct cec_pin_ops {
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bool (*read)(struct cec_adapter *adap);
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void (*low)(struct cec_adapter *adap);
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void (*high)(struct cec_adapter *adap);
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bool (*enable_irq)(struct cec_adapter *adap);
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void (*disable_irq)(struct cec_adapter *adap);
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void (*free)(struct cec_adapter *adap);
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void (*status)(struct cec_adapter *adap, struct seq_file *file);
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};
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#define CEC_NUM_PIN_EVENTS 128
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#define CEC_PIN_IRQ_UNCHANGED 0
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#define CEC_PIN_IRQ_DISABLE 1
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#define CEC_PIN_IRQ_ENABLE 2
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struct cec_pin {
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struct cec_adapter *adap;
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const struct cec_pin_ops *ops;
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struct task_struct *kthread;
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wait_queue_head_t kthread_waitq;
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struct hrtimer timer;
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ktime_t ts;
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unsigned int wait_usecs;
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u16 la_mask;
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bool enabled;
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bool monitor_all;
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bool rx_eom;
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bool enable_irq_failed;
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enum cec_pin_state state;
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struct cec_msg tx_msg;
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u32 tx_bit;
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bool tx_nacked;
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u32 tx_signal_free_time;
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struct cec_msg rx_msg;
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u32 rx_bit;
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struct cec_msg work_rx_msg;
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u8 work_tx_status;
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ktime_t work_tx_ts;
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atomic_t work_irq_change;
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atomic_t work_pin_events;
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unsigned int work_pin_events_wr;
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unsigned int work_pin_events_rd;
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ktime_t work_pin_ts[CEC_NUM_PIN_EVENTS];
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bool work_pin_is_high[CEC_NUM_PIN_EVENTS];
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ktime_t timer_ts;
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u32 timer_cnt;
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u32 timer_100ms_overruns;
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u32 timer_300ms_overruns;
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u32 timer_max_overrun;
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u32 timer_sum_overrun;
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};
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/**
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* cec_pin_changed() - update pin state from interrupt
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*
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* @adap: pointer to the cec adapter
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* @value: when true the pin is high, otherwise it is low
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*
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* If changes of the CEC voltage are detected via an interrupt, then
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* cec_pin_changed is called from the interrupt with the new value.
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*/
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void cec_pin_changed(struct cec_adapter *adap, bool value);
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/**
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* cec_pin_allocate_adapter() - allocate a pin-based cec adapter
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*
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* @pin_ops: low-level pin operations
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* @priv: will be stored in adap->priv and can be used by the adapter ops.
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* Use cec_get_drvdata(adap) to get the priv pointer.
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* @name: the name of the CEC adapter. Note: this name will be copied.
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* @caps: capabilities of the CEC adapter. This will be ORed with
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* CEC_CAP_MONITOR_ALL and CEC_CAP_MONITOR_PIN.
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*
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* Allocate a cec adapter using the cec pin framework.
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*
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* Return: a pointer to the cec adapter or an error pointer
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*/
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struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops,
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void *priv, const char *name, u32 caps);
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#endif
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