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authorBeniamino Galvani <b.galvani@gmail.com>2014-11-18 17:22:34 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2014-11-26 13:29:01 -0200
commit12ddbadf383d551e2681eb361b4f5c400363b5cd (patch)
tree9b0ab4c8a8ea798486e4545e86bb2d40fa7ff465 /drivers/media/rc/meson-ir.c
parent36cdfa76635b502c8c7bb7df695d7d5117eca7de (diff)
[media] media: rc: add driver for Amlogic Meson IR remote receiver
Amlogic Meson SoCs include a infrared remote control receiver that can operate in two modes: "NEC" mode in which the hardware decodes frames using the NEC IR protocol, and "general" mode in which the receiver simply reports the duration of pulses and spaces for software decoding. This is a driver for the IR receiver that implements software decoding of received frames. Signed-off-by: Beniamino Galvani <b.galvani@gmail.com> Acked-by: Carlo Caione <carlo@caione.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/rc/meson-ir.c')
-rw-r--r--drivers/media/rc/meson-ir.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
new file mode 100644
index 000000000000..fcc3b82d1454
--- /dev/null
+++ b/drivers/media/rc/meson-ir.c
@@ -0,0 +1,216 @@
+/*
+ * Driver for Amlogic Meson IR remote receiver
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#include <media/rc-core.h>
+
+#define DRIVER_NAME "meson-ir"
+
+#define IR_DEC_LDR_ACTIVE 0x00
+#define IR_DEC_LDR_IDLE 0x04
+#define IR_DEC_LDR_REPEAT 0x08
+#define IR_DEC_BIT_0 0x0c
+#define IR_DEC_REG0 0x10
+#define IR_DEC_FRAME 0x14
+#define IR_DEC_STATUS 0x18
+#define IR_DEC_REG1 0x1c
+
+#define REG0_RATE_MASK (BIT(11) - 1)
+
+#define REG1_MODE_MASK (BIT(7) | BIT(8))
+#define REG1_MODE_NEC (0 << 7)
+#define REG1_MODE_GENERAL (2 << 7)
+
+#define REG1_TIME_IV_SHIFT 16
+#define REG1_TIME_IV_MASK ((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
+
+#define REG1_IRQSEL_MASK (BIT(2) | BIT(3))
+#define REG1_IRQSEL_NEC_MODE (0 << 2)
+#define REG1_IRQSEL_RISE_FALL (1 << 2)
+#define REG1_IRQSEL_FALL (2 << 2)
+#define REG1_IRQSEL_RISE (3 << 2)
+
+#define REG1_RESET BIT(0)
+#define REG1_ENABLE BIT(15)
+
+#define STATUS_IR_DEC_IN BIT(8)
+
+#define MESON_TRATE 10 /* us */
+
+struct meson_ir {
+ void __iomem *reg;
+ struct rc_dev *rc;
+ int irq;
+ spinlock_t lock;
+};
+
+static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
+ u32 mask, u32 value)
+{
+ u32 data;
+
+ data = readl(ir->reg + reg);
+ data &= ~mask;
+ data |= (value & mask);
+ writel(data, ir->reg + reg);
+}
+
+static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
+{
+ struct meson_ir *ir = dev_id;
+ u32 duration;
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ spin_lock(&ir->lock);
+
+ duration = readl(ir->reg + IR_DEC_REG1);
+ duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
+ rawir.duration = US_TO_NS(duration * MESON_TRATE);
+
+ rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
+
+ ir_raw_event_store_with_filter(ir->rc, &rawir);
+ ir_raw_event_handle(ir->rc);
+
+ spin_unlock(&ir->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int meson_ir_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct resource *res;
+ const char *map_name;
+ struct meson_ir *ir;
+ int ret;
+
+ ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
+ if (!ir)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ir->reg = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ir->reg)) {
+ dev_err(dev, "failed to map registers\n");
+ return PTR_ERR(ir->reg);
+ }
+
+ ir->irq = platform_get_irq(pdev, 0);
+ if (ir->irq < 0) {
+ dev_err(dev, "no irq resource\n");
+ return ir->irq;
+ }
+
+ ir->rc = rc_allocate_device();
+ if (!ir->rc) {
+ dev_err(dev, "failed to allocate rc device\n");
+ return -ENOMEM;
+ }
+
+ ir->rc->priv = ir;
+ ir->rc->input_name = DRIVER_NAME;
+ ir->rc->input_phys = DRIVER_NAME "/input0";
+ ir->rc->input_id.bustype = BUS_HOST;
+ map_name = of_get_property(node, "linux,rc-map-name", NULL);
+ ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
+ ir->rc->dev.parent = dev;
+ ir->rc->driver_type = RC_DRIVER_IR_RAW;
+ ir->rc->allowed_protocols = RC_BIT_ALL;
+ ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
+ ir->rc->timeout = MS_TO_NS(200);
+ ir->rc->driver_name = DRIVER_NAME;
+
+ spin_lock_init(&ir->lock);
+ platform_set_drvdata(pdev, ir);
+
+ ret = rc_register_device(ir->rc);
+ if (ret) {
+ dev_err(dev, "failed to register rc device\n");
+ goto out_free;
+ }
+
+ ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir);
+ if (ret) {
+ dev_err(dev, "failed to request irq\n");
+ goto out_unreg;
+ }
+
+ /* Reset the decoder */
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
+ /* Set general operation mode */
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, REG1_MODE_GENERAL);
+ /* Set rate */
+ meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
+ /* IRQ on rising and falling edges */
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
+ REG1_IRQSEL_RISE_FALL);
+ /* Enable the decoder */
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
+
+ dev_info(dev, "receiver initialized\n");
+
+ return 0;
+out_unreg:
+ rc_unregister_device(ir->rc);
+ ir->rc = NULL;
+out_free:
+ rc_free_device(ir->rc);
+
+ return ret;
+}
+
+static int meson_ir_remove(struct platform_device *pdev)
+{
+ struct meson_ir *ir = platform_get_drvdata(pdev);
+ unsigned long flags;
+
+ /* Disable the decoder */
+ spin_lock_irqsave(&ir->lock, flags);
+ meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
+ spin_unlock_irqrestore(&ir->lock, flags);
+
+ rc_unregister_device(ir->rc);
+
+ return 0;
+}
+
+static const struct of_device_id meson_ir_match[] = {
+ { .compatible = "amlogic,meson6-ir" },
+ { },
+};
+
+static struct platform_driver meson_ir_driver = {
+ .probe = meson_ir_probe,
+ .remove = meson_ir_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = meson_ir_match,
+ },
+};
+
+module_platform_driver(meson_ir_driver);
+
+MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
+MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
+MODULE_LICENSE("GPL v2");

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