--- /dev/null
+/*
+ * 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");
projects / linux-beck.git / commitdiff