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path: root/drivers/media/platform/s5p-cec/s5p_cec.c
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Diffstat (limited to 'drivers/media/platform/s5p-cec/s5p_cec.c')
-rw-r--r--drivers/media/platform/s5p-cec/s5p_cec.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/media/platform/s5p-cec/s5p_cec.c b/drivers/media/platform/s5p-cec/s5p_cec.c
new file mode 100644
index 000000000000..664937b61fa4
--- /dev/null
+++ b/drivers/media/platform/s5p-cec/s5p_cec.c
@@ -0,0 +1,304 @@
+/* drivers/media/platform/s5p-cec/s5p_cec.c
+ *
+ * Samsung S5P CEC driver
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This driver is based on the "cec interface driver for exynos soc" by
+ * SangPil Moon.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <media/cec.h>
+#include <media/cec-notifier.h>
+
+#include "exynos_hdmi_cec.h"
+#include "regs-cec.h"
+#include "s5p_cec.h"
+
+#define CEC_NAME "s5p-cec"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+static int s5p_cec_adap_enable(struct cec_adapter *adap, bool enable)
+{
+ struct s5p_cec_dev *cec = cec_get_drvdata(adap);
+
+ if (enable) {
+ pm_runtime_get_sync(cec->dev);
+
+ s5p_cec_reset(cec);
+
+ s5p_cec_set_divider(cec);
+ s5p_cec_threshold(cec);
+
+ s5p_cec_unmask_tx_interrupts(cec);
+ s5p_cec_unmask_rx_interrupts(cec);
+ s5p_cec_enable_rx(cec);
+ } else {
+ s5p_cec_mask_tx_interrupts(cec);
+ s5p_cec_mask_rx_interrupts(cec);
+ pm_runtime_disable(cec->dev);
+ }
+
+ return 0;
+}
+
+static int s5p_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
+{
+ struct s5p_cec_dev *cec = cec_get_drvdata(adap);
+
+ s5p_cec_set_addr(cec, addr);
+ return 0;
+}
+
+static int s5p_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg)
+{
+ struct s5p_cec_dev *cec = cec_get_drvdata(adap);
+
+ /*
+ * Unclear if 0 retries are allowed by the hardware, so have 1 as
+ * the minimum.
+ */
+ s5p_cec_copy_packet(cec, msg->msg, msg->len, max(1, attempts - 1));
+ return 0;
+}
+
+static irqreturn_t s5p_cec_irq_handler(int irq, void *priv)
+{
+ struct s5p_cec_dev *cec = priv;
+ u32 status = 0;
+
+ status = s5p_cec_get_status(cec);
+
+ dev_dbg(cec->dev, "irq received\n");
+
+ if (status & CEC_STATUS_TX_DONE) {
+ if (status & CEC_STATUS_TX_ERROR) {
+ dev_dbg(cec->dev, "CEC_STATUS_TX_ERROR set\n");
+ cec->tx = STATE_ERROR;
+ } else {
+ dev_dbg(cec->dev, "CEC_STATUS_TX_DONE\n");
+ cec->tx = STATE_DONE;
+ }
+ s5p_clr_pending_tx(cec);
+ }
+
+ if (status & CEC_STATUS_RX_DONE) {
+ if (status & CEC_STATUS_RX_ERROR) {
+ dev_dbg(cec->dev, "CEC_STATUS_RX_ERROR set\n");
+ s5p_cec_rx_reset(cec);
+ s5p_cec_enable_rx(cec);
+ } else {
+ dev_dbg(cec->dev, "CEC_STATUS_RX_DONE set\n");
+ if (cec->rx != STATE_IDLE)
+ dev_dbg(cec->dev, "Buffer overrun (worker did not process previous message)\n");
+ cec->rx = STATE_BUSY;
+ cec->msg.len = status >> 24;
+ cec->msg.rx_status = CEC_RX_STATUS_OK;
+ s5p_cec_get_rx_buf(cec, cec->msg.len,
+ cec->msg.msg);
+ cec->rx = STATE_DONE;
+ s5p_cec_enable_rx(cec);
+ }
+ /* Clear interrupt pending bit */
+ s5p_clr_pending_rx(cec);
+ }
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t s5p_cec_irq_handler_thread(int irq, void *priv)
+{
+ struct s5p_cec_dev *cec = priv;
+
+ dev_dbg(cec->dev, "irq processing thread\n");
+ switch (cec->tx) {
+ case STATE_DONE:
+ cec_transmit_done(cec->adap, CEC_TX_STATUS_OK, 0, 0, 0, 0);
+ cec->tx = STATE_IDLE;
+ break;
+ case STATE_ERROR:
+ cec_transmit_done(cec->adap,
+ CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_ERROR,
+ 0, 0, 0, 1);
+ cec->tx = STATE_IDLE;
+ break;
+ case STATE_BUSY:
+ dev_err(cec->dev, "state set to busy, this should not occur here\n");
+ break;
+ default:
+ break;
+ }
+
+ switch (cec->rx) {
+ case STATE_DONE:
+ cec_received_msg(cec->adap, &cec->msg);
+ cec->rx = STATE_IDLE;
+ break;
+ default:
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static const struct cec_adap_ops s5p_cec_adap_ops = {
+ .adap_enable = s5p_cec_adap_enable,
+ .adap_log_addr = s5p_cec_adap_log_addr,
+ .adap_transmit = s5p_cec_adap_transmit,
+};
+
+static int s5p_cec_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np;
+ struct platform_device *hdmi_dev;
+ struct resource *res;
+ struct s5p_cec_dev *cec;
+ int ret;
+
+ np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
+
+ if (!np) {
+ dev_err(&pdev->dev, "Failed to find hdmi node in device tree\n");
+ return -ENODEV;
+ }
+ hdmi_dev = of_find_device_by_node(np);
+ if (hdmi_dev == NULL)
+ return -EPROBE_DEFER;
+
+ cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
+ if (!cec)
+ return -ENOMEM;
+
+ cec->dev = dev;
+
+ cec->irq = platform_get_irq(pdev, 0);
+ if (cec->irq < 0)
+ return cec->irq;
+
+ ret = devm_request_threaded_irq(dev, cec->irq, s5p_cec_irq_handler,
+ s5p_cec_irq_handler_thread, 0, pdev->name, cec);
+ if (ret)
+ return ret;
+
+ cec->clk = devm_clk_get(dev, "hdmicec");
+ if (IS_ERR(cec->clk))
+ return PTR_ERR(cec->clk);
+
+ cec->pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,syscon-phandle");
+ if (IS_ERR(cec->pmu))
+ return -EPROBE_DEFER;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cec->reg = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cec->reg))
+ return PTR_ERR(cec->reg);
+
+ cec->notifier = cec_notifier_get(&hdmi_dev->dev);
+ if (cec->notifier == NULL)
+ return -ENOMEM;
+
+ cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec,
+ CEC_NAME,
+ CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
+ CEC_CAP_PASSTHROUGH | CEC_CAP_RC, 1);
+ ret = PTR_ERR_OR_ZERO(cec->adap);
+ if (ret)
+ return ret;
+
+ ret = cec_register_adapter(cec->adap, &pdev->dev);
+ if (ret)
+ goto err_delete_adapter;
+
+ cec_register_cec_notifier(cec->adap, cec->notifier);
+
+ platform_set_drvdata(pdev, cec);
+ pm_runtime_enable(dev);
+
+ dev_dbg(dev, "successfuly probed\n");
+ return 0;
+
+err_delete_adapter:
+ cec_delete_adapter(cec->adap);
+ return ret;
+}
+
+static int s5p_cec_remove(struct platform_device *pdev)
+{
+ struct s5p_cec_dev *cec = platform_get_drvdata(pdev);
+
+ cec_unregister_adapter(cec->adap);
+ cec_notifier_put(cec->notifier);
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static int __maybe_unused s5p_cec_runtime_suspend(struct device *dev)
+{
+ struct s5p_cec_dev *cec = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(cec->clk);
+ return 0;
+}
+
+static int __maybe_unused s5p_cec_runtime_resume(struct device *dev)
+{
+ struct s5p_cec_dev *cec = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(cec->clk);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static const struct dev_pm_ops s5p_cec_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(s5p_cec_runtime_suspend, s5p_cec_runtime_resume,
+ NULL)
+};
+
+static const struct of_device_id s5p_cec_match[] = {
+ {
+ .compatible = "samsung,s5p-cec",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s5p_cec_match);
+
+static struct platform_driver s5p_cec_pdrv = {
+ .probe = s5p_cec_probe,
+ .remove = s5p_cec_remove,
+ .driver = {
+ .name = CEC_NAME,
+ .of_match_table = s5p_cec_match,
+ .pm = &s5p_cec_pm_ops,
+ },
+};
+
+module_platform_driver(s5p_cec_pdrv);
+
+MODULE_AUTHOR("Kamil Debski <kamil@wypas.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Samsung S5P CEC driver");