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path: root/drivers/media/rc/img-ir/img-ir-core.c
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Diffstat (limited to 'drivers/media/rc/img-ir/img-ir-core.c')
-rw-r--r--drivers/media/rc/img-ir/img-ir-core.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/media/rc/img-ir/img-ir-core.c b/drivers/media/rc/img-ir/img-ir-core.c
new file mode 100644
index 0000000..6b78348
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-core.c
@@ -0,0 +1,176 @@
+/*
+ * ImgTec IR Decoder found in PowerDown Controller.
+ *
+ * Copyright 2010-2014 Imagination Technologies Ltd.
+ *
+ * This contains core img-ir code for setting up the driver. The two interfaces
+ * (raw and hardware decode) are handled separately.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include "img-ir.h"
+
+static irqreturn_t img_ir_isr(int irq, void *dev_id)
+{
+ struct img_ir_priv *priv = dev_id;
+ u32 irq_status;
+
+ spin_lock(&priv->lock);
+ /* we have to clear irqs before reading */
+ irq_status = img_ir_read(priv, IMG_IR_IRQ_STATUS);
+ img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_status);
+
+ /* don't handle valid data irqs if we're only interested in matches */
+ irq_status &= img_ir_read(priv, IMG_IR_IRQ_ENABLE);
+
+ /* hand off edge interrupts to raw decode handler */
+ if (irq_status & IMG_IR_IRQ_EDGE && img_ir_raw_enabled(&priv->raw))
+ img_ir_isr_raw(priv, irq_status);
+
+ /* hand off hardware match interrupts to hardware decode handler */
+ if (irq_status & (IMG_IR_IRQ_DATA_MATCH |
+ IMG_IR_IRQ_DATA_VALID |
+ IMG_IR_IRQ_DATA2_VALID) &&
+ img_ir_hw_enabled(&priv->hw))
+ img_ir_isr_hw(priv, irq_status);
+
+ spin_unlock(&priv->lock);
+ return IRQ_HANDLED;
+}
+
+static void img_ir_setup(struct img_ir_priv *priv)
+{
+ /* start off with interrupts disabled */
+ img_ir_write(priv, IMG_IR_IRQ_ENABLE, 0);
+
+ img_ir_setup_raw(priv);
+ img_ir_setup_hw(priv);
+
+ if (!IS_ERR(priv->clk))
+ clk_prepare_enable(priv->clk);
+}
+
+static void img_ir_ident(struct img_ir_priv *priv)
+{
+ u32 core_rev = img_ir_read(priv, IMG_IR_CORE_REV);
+
+ dev_info(priv->dev,
+ "IMG IR Decoder (%d.%d.%d.%d) probed successfully\n",
+ (core_rev & IMG_IR_DESIGNER) >> IMG_IR_DESIGNER_SHIFT,
+ (core_rev & IMG_IR_MAJOR_REV) >> IMG_IR_MAJOR_REV_SHIFT,
+ (core_rev & IMG_IR_MINOR_REV) >> IMG_IR_MINOR_REV_SHIFT,
+ (core_rev & IMG_IR_MAINT_REV) >> IMG_IR_MAINT_REV_SHIFT);
+ dev_info(priv->dev, "Modes:%s%s\n",
+ img_ir_hw_enabled(&priv->hw) ? " hardware" : "",
+ img_ir_raw_enabled(&priv->raw) ? " raw" : "");
+}
+
+static int img_ir_probe(struct platform_device *pdev)
+{
+ struct img_ir_priv *priv;
+ struct resource *res_regs;
+ int irq, error, error2;
+
+ /* Get resources from platform device */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "cannot find IRQ resource\n");
+ return irq;
+ }
+
+ /* Private driver data */
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ dev_err(&pdev->dev, "cannot allocate device data\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pdev, priv);
+ priv->dev = &pdev->dev;
+ spin_lock_init(&priv->lock);
+
+ /* Ioremap the registers */
+ res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->reg_base = devm_ioremap_resource(&pdev->dev, res_regs);
+ if (IS_ERR(priv->reg_base))
+ return PTR_ERR(priv->reg_base);
+
+ /* Get core clock */
+ priv->clk = devm_clk_get(&pdev->dev, "core");
+ if (IS_ERR(priv->clk))
+ dev_warn(&pdev->dev, "cannot get core clock resource\n");
+ /*
+ * The driver doesn't need to know about the system ("sys") or power
+ * modulation ("mod") clocks yet
+ */
+
+ /* Set up raw & hw decoder */
+ error = img_ir_probe_raw(priv);
+ error2 = img_ir_probe_hw(priv);
+ if (error && error2)
+ return (error == -ENODEV) ? error2 : error;
+
+ /* Get the IRQ */
+ priv->irq = irq;
+ error = request_irq(priv->irq, img_ir_isr, 0, "img-ir", priv);
+ if (error) {
+ dev_err(&pdev->dev, "cannot register IRQ %u\n",
+ priv->irq);
+ error = -EIO;
+ goto err_irq;
+ }
+
+ img_ir_ident(priv);
+ img_ir_setup(priv);
+
+ return 0;
+
+err_irq:
+ img_ir_remove_hw(priv);
+ img_ir_remove_raw(priv);
+ return error;
+}
+
+static int img_ir_remove(struct platform_device *pdev)
+{
+ struct img_ir_priv *priv = platform_get_drvdata(pdev);
+
+ free_irq(priv->irq, img_ir_isr);
+ img_ir_remove_hw(priv);
+ img_ir_remove_raw(priv);
+
+ if (!IS_ERR(priv->clk))
+ clk_disable_unprepare(priv->clk);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(img_ir_pmops, img_ir_suspend, img_ir_resume);
+
+static const struct of_device_id img_ir_match[] = {
+ { .compatible = "img,ir-rev1" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, img_ir_match);
+
+static struct platform_driver img_ir_driver = {
+ .driver = {
+ .name = "img-ir",
+ .owner = THIS_MODULE,
+ .of_match_table = img_ir_match,
+ .pm = &img_ir_pmops,
+ },
+ .probe = img_ir_probe,
+ .remove = img_ir_remove,
+};
+
+module_platform_driver(img_ir_driver);
+
+MODULE_AUTHOR("Imagination Technologies Ltd.");
+MODULE_DESCRIPTION("ImgTec IR");
+MODULE_LICENSE("GPL");
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