diff options
Diffstat (limited to 'drivers/media/rc/meson-ir.c')
| -rw-r--r-- | drivers/media/rc/meson-ir.c | 216 |
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 00000000000..fcc3b82d145 --- /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"); |