// SPDX-License-Identifier: GPL-2.0-or-later
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/* drivers/media/platform/s5p-cec/s5p_cec.c
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*
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* Samsung S5P CEC driver
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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*
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* This driver is based on the "cec interface driver for exynos soc" by
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* SangPil Moon.
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*/
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <media/cec.h>
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#include <media/cec-notifier.h>
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#include "exynos_hdmi_cec.h"
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#include "regs-cec.h"
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#include "s5p_cec.h"
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#define CEC_NAME "s5p-cec"
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "debug level (0-2)");
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static int s5p_cec_adap_enable(struct cec_adapter *adap, bool enable)
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{
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int ret;
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struct s5p_cec_dev *cec = cec_get_drvdata(adap);
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if (enable) {
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ret = pm_runtime_resume_and_get(cec->dev);
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if (ret < 0)
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return ret;
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s5p_cec_reset(cec);
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s5p_cec_set_divider(cec);
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s5p_cec_threshold(cec);
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s5p_cec_unmask_tx_interrupts(cec);
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s5p_cec_unmask_rx_interrupts(cec);
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s5p_cec_enable_rx(cec);
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} else {
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s5p_cec_mask_tx_interrupts(cec);
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s5p_cec_mask_rx_interrupts(cec);
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pm_runtime_put(cec->dev);
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}
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return 0;
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}
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static int s5p_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
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{
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struct s5p_cec_dev *cec = cec_get_drvdata(adap);
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s5p_cec_set_addr(cec, addr);
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return 0;
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}
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static int s5p_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
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u32 signal_free_time, struct cec_msg *msg)
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{
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struct s5p_cec_dev *cec = cec_get_drvdata(adap);
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/*
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* Unclear if 0 retries are allowed by the hardware, so have 1 as
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* the minimum.
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*/
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s5p_cec_copy_packet(cec, msg->msg, msg->len, max(1, attempts - 1));
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return 0;
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}
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static irqreturn_t s5p_cec_irq_handler(int irq, void *priv)
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{
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struct s5p_cec_dev *cec = priv;
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u32 status = 0;
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status = s5p_cec_get_status(cec);
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dev_dbg(cec->dev, "irq received\n");
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if (status & CEC_STATUS_TX_DONE) {
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if (status & CEC_STATUS_TX_NACK) {
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dev_dbg(cec->dev, "CEC_STATUS_TX_NACK set\n");
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cec->tx = STATE_NACK;
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} else if (status & CEC_STATUS_TX_ERROR) {
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dev_dbg(cec->dev, "CEC_STATUS_TX_ERROR set\n");
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cec->tx = STATE_ERROR;
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} else {
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dev_dbg(cec->dev, "CEC_STATUS_TX_DONE\n");
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cec->tx = STATE_DONE;
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}
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s5p_clr_pending_tx(cec);
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}
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if (status & CEC_STATUS_RX_DONE) {
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if (status & CEC_STATUS_RX_ERROR) {
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dev_dbg(cec->dev, "CEC_STATUS_RX_ERROR set\n");
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s5p_cec_rx_reset(cec);
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s5p_cec_enable_rx(cec);
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} else {
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dev_dbg(cec->dev, "CEC_STATUS_RX_DONE set\n");
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if (cec->rx != STATE_IDLE)
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dev_dbg(cec->dev, "Buffer overrun (worker did not process previous message)\n");
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cec->rx = STATE_BUSY;
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cec->msg.len = status >> 24;
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if (cec->msg.len > CEC_MAX_MSG_SIZE)
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cec->msg.len = CEC_MAX_MSG_SIZE;
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cec->msg.rx_status = CEC_RX_STATUS_OK;
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s5p_cec_get_rx_buf(cec, cec->msg.len,
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cec->msg.msg);
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cec->rx = STATE_DONE;
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s5p_cec_enable_rx(cec);
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}
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/* Clear interrupt pending bit */
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s5p_clr_pending_rx(cec);
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}
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t s5p_cec_irq_handler_thread(int irq, void *priv)
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{
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struct s5p_cec_dev *cec = priv;
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dev_dbg(cec->dev, "irq processing thread\n");
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switch (cec->tx) {
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case STATE_DONE:
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cec_transmit_done(cec->adap, CEC_TX_STATUS_OK, 0, 0, 0, 0);
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cec->tx = STATE_IDLE;
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break;
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case STATE_NACK:
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cec_transmit_done(cec->adap,
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CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_NACK,
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0, 1, 0, 0);
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cec->tx = STATE_IDLE;
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break;
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case STATE_ERROR:
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cec_transmit_done(cec->adap,
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CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_ERROR,
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0, 0, 0, 1);
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cec->tx = STATE_IDLE;
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break;
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case STATE_BUSY:
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dev_err(cec->dev, "state set to busy, this should not occur here\n");
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break;
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default:
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break;
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}
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switch (cec->rx) {
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case STATE_DONE:
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cec_received_msg(cec->adap, &cec->msg);
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cec->rx = STATE_IDLE;
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break;
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default:
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break;
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}
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return IRQ_HANDLED;
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}
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static const struct cec_adap_ops s5p_cec_adap_ops = {
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.adap_enable = s5p_cec_adap_enable,
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.adap_log_addr = s5p_cec_adap_log_addr,
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.adap_transmit = s5p_cec_adap_transmit,
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};
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static int s5p_cec_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device *hdmi_dev;
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struct resource *res;
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struct s5p_cec_dev *cec;
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bool needs_hpd = of_property_read_bool(pdev->dev.of_node, "needs-hpd");
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int ret;
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hdmi_dev = cec_notifier_parse_hdmi_phandle(dev);
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if (IS_ERR(hdmi_dev))
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return PTR_ERR(hdmi_dev);
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cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
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if (!cec)
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return -ENOMEM;
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cec->dev = dev;
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cec->irq = platform_get_irq(pdev, 0);
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if (cec->irq < 0)
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return cec->irq;
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ret = devm_request_threaded_irq(dev, cec->irq, s5p_cec_irq_handler,
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s5p_cec_irq_handler_thread, 0, pdev->name, cec);
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if (ret)
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return ret;
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cec->clk = devm_clk_get(dev, "hdmicec");
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if (IS_ERR(cec->clk))
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return PTR_ERR(cec->clk);
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cec->pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
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"samsung,syscon-phandle");
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if (IS_ERR(cec->pmu))
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return -EPROBE_DEFER;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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cec->reg = devm_ioremap_resource(dev, res);
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if (IS_ERR(cec->reg))
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return PTR_ERR(cec->reg);
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cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec, CEC_NAME,
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CEC_CAP_DEFAULTS | (needs_hpd ? CEC_CAP_NEEDS_HPD : 0) |
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CEC_CAP_CONNECTOR_INFO, 1);
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ret = PTR_ERR_OR_ZERO(cec->adap);
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if (ret)
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return ret;
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cec->notifier = cec_notifier_cec_adap_register(hdmi_dev, NULL,
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cec->adap);
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if (!cec->notifier) {
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ret = -ENOMEM;
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goto err_delete_adapter;
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}
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ret = cec_register_adapter(cec->adap, &pdev->dev);
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if (ret)
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goto err_notifier;
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platform_set_drvdata(pdev, cec);
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pm_runtime_enable(dev);
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dev_dbg(dev, "successfully probed\n");
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return 0;
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err_notifier:
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cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
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err_delete_adapter:
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cec_delete_adapter(cec->adap);
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return ret;
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}
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static int s5p_cec_remove(struct platform_device *pdev)
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{
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struct s5p_cec_dev *cec = platform_get_drvdata(pdev);
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cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
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cec_unregister_adapter(cec->adap);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static int __maybe_unused s5p_cec_runtime_suspend(struct device *dev)
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{
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struct s5p_cec_dev *cec = dev_get_drvdata(dev);
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clk_disable_unprepare(cec->clk);
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return 0;
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}
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static int __maybe_unused s5p_cec_runtime_resume(struct device *dev)
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{
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struct s5p_cec_dev *cec = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare_enable(cec->clk);
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if (ret < 0)
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return ret;
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return 0;
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}
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static const struct dev_pm_ops s5p_cec_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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SET_RUNTIME_PM_OPS(s5p_cec_runtime_suspend, s5p_cec_runtime_resume,
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NULL)
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};
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static const struct of_device_id s5p_cec_match[] = {
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{
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.compatible = "samsung,s5p-cec",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, s5p_cec_match);
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static struct platform_driver s5p_cec_pdrv = {
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.probe = s5p_cec_probe,
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.remove = s5p_cec_remove,
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.driver = {
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.name = CEC_NAME,
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.of_match_table = s5p_cec_match,
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.pm = &s5p_cec_pm_ops,
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},
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};
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module_platform_driver(s5p_cec_pdrv);
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MODULE_AUTHOR("Kamil Debski <kamil@wypas.org>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Samsung S5P CEC driver");
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