diff options
Diffstat (limited to 'drivers/media/rc/meson-ir.c')
| -rw-r--r-- | drivers/media/rc/meson-ir.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c new file mode 100644 index 0000000000..70322fab34 --- /dev/null +++ b/drivers/media/rc/meson-ir.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Amlogic Meson IR remote receiver + * + * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include <linux/bitfield.h> +#include <linux/regmap.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_REG0_BASE_TIME GENMASK(11, 0) +#define IR_DEC_FRAME 0x14 +#define IR_DEC_STATUS 0x18 +#define IR_DEC_STATUS_PULSE BIT(8) +#define IR_DEC_REG1 0x1c +#define IR_DEC_REG1_TIME_IV GENMASK(28, 16) +#define IR_DEC_REG1_ENABLE BIT(15) +#define IR_DEC_REG1_MODE GENMASK(8, 7) +#define IR_DEC_REG1_IRQSEL GENMASK(3, 2) +#define IR_DEC_REG1_RESET BIT(0) +/* The following regs are only available on Meson 8b and newer */ +#define IR_DEC_REG2 0x20 +#define IR_DEC_REG2_MODE GENMASK(3, 0) + +#define DEC_MODE_NEC 0x0 +#define DEC_MODE_RAW 0x2 + +#define IRQSEL_NEC_MODE 0 +#define IRQSEL_RISE_FALL 1 +#define IRQSEL_FALL 2 +#define IRQSEL_RISE 3 + +#define MESON_RAW_TRATE 10 /* us */ +#define MESON_HW_TRATE 20 /* us */ + +struct meson_ir { + struct regmap *reg; + struct rc_dev *rc; + spinlock_t lock; +}; + +static const struct regmap_config meson_ir_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static irqreturn_t meson_ir_irq(int irqno, void *dev_id) +{ + struct meson_ir *ir = dev_id; + u32 duration, status; + struct ir_raw_event rawir = {}; + + spin_lock(&ir->lock); + + regmap_read(ir->reg, IR_DEC_REG1, &duration); + duration = FIELD_GET(IR_DEC_REG1_TIME_IV, duration); + rawir.duration = duration * MESON_RAW_TRATE; + + regmap_read(ir->reg, IR_DEC_STATUS, &status); + rawir.pulse = !!(status & IR_DEC_STATUS_PULSE); + + ir_raw_event_store_with_timeout(ir->rc, &rawir); + + 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; + void __iomem *res_start; + const char *map_name; + struct meson_ir *ir; + int irq, ret; + + ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL); + if (!ir) + return -ENOMEM; + + res_start = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(res_start)) + return PTR_ERR(res_start); + + ir->reg = devm_regmap_init_mmio(&pdev->dev, res_start, + &meson_ir_regmap_config); + if (IS_ERR(ir->reg)) + return PTR_ERR(ir->reg); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); + if (!ir->rc) { + dev_err(dev, "failed to allocate rc device\n"); + return -ENOMEM; + } + + ir->rc->priv = ir; + ir->rc->device_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->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; + ir->rc->rx_resolution = MESON_RAW_TRATE; + ir->rc->min_timeout = 1; + ir->rc->timeout = IR_DEFAULT_TIMEOUT; + ir->rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT; + ir->rc->driver_name = DRIVER_NAME; + + spin_lock_init(&ir->lock); + platform_set_drvdata(pdev, ir); + + ret = devm_rc_register_device(dev, ir->rc); + if (ret) { + dev_err(dev, "failed to register rc device\n"); + return ret; + } + + ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir); + if (ret) { + dev_err(dev, "failed to request irq\n"); + return ret; + } + + /* Reset the decoder */ + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_RESET, + IR_DEC_REG1_RESET); + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_RESET, 0); + + /* Set general operation mode (= raw/software decoding) */ + if (of_device_is_compatible(node, "amlogic,meson6-ir")) + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_MODE, + FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_RAW)); + else + regmap_update_bits(ir->reg, IR_DEC_REG2, IR_DEC_REG2_MODE, + FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_RAW)); + + /* Set rate */ + regmap_update_bits(ir->reg, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME, + FIELD_PREP(IR_DEC_REG0_BASE_TIME, + MESON_RAW_TRATE - 1)); + /* IRQ on rising and falling edges */ + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_IRQSEL, + FIELD_PREP(IR_DEC_REG1_IRQSEL, IRQSEL_RISE_FALL)); + /* Enable the decoder */ + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_ENABLE, + IR_DEC_REG1_ENABLE); + + dev_info(dev, "receiver initialized\n"); + + return 0; +} + +static void 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); + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_ENABLE, 0); + spin_unlock_irqrestore(&ir->lock, flags); +} + +static void meson_ir_shutdown(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct meson_ir *ir = platform_get_drvdata(pdev); + unsigned long flags; + + spin_lock_irqsave(&ir->lock, flags); + + /* + * Set operation mode to NEC/hardware decoding to give + * bootloader a chance to power the system back on + */ + if (of_device_is_compatible(node, "amlogic,meson6-ir")) + regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_MODE, + FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_NEC)); + else + regmap_update_bits(ir->reg, IR_DEC_REG2, IR_DEC_REG2_MODE, + FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_NEC)); + + /* Set rate to default value */ + regmap_update_bits(ir->reg, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME, + FIELD_PREP(IR_DEC_REG0_BASE_TIME, + MESON_HW_TRATE - 1)); + + spin_unlock_irqrestore(&ir->lock, flags); +} + +static const struct of_device_id meson_ir_match[] = { + { .compatible = "amlogic,meson6-ir" }, + { .compatible = "amlogic,meson8b-ir" }, + { .compatible = "amlogic,meson-gxbb-ir" }, + { }, +}; +MODULE_DEVICE_TABLE(of, meson_ir_match); + +static struct platform_driver meson_ir_driver = { + .probe = meson_ir_probe, + .remove_new = meson_ir_remove, + .shutdown = meson_ir_shutdown, + .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"); |