On Sun, Nov 09, 2014 at 09:32:07AM +0100, Beniamino Galvani wrote: > 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@xxxxxxxxx> > --- > MAINTAINERS | 1 + > drivers/media/rc/Kconfig | 11 +++ > drivers/media/rc/Makefile | 1 + > drivers/media/rc/meson-ir.c | 215 ++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 228 insertions(+) > create mode 100644 drivers/media/rc/meson-ir.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 0662378..f1bc045 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -850,6 +850,7 @@ ARM/Amlogic MesonX SoC support > M: Carlo Caione <carlo@xxxxxxxxxx> > L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx (moderated for non-subscribers) > S: Maintained > +F: drivers/media/rc/meson-ir.c > N: meson[x68] > > ARM/ATMEL AT91RM9200 AND AT91SAM ARM ARCHITECTURES > diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig > index 1aea732..ddfab25 100644 > --- a/drivers/media/rc/Kconfig > +++ b/drivers/media/rc/Kconfig > @@ -223,6 +223,17 @@ config IR_FINTEK > To compile this driver as a module, choose M here: the > module will be called fintek-cir. > > +config IR_MESON > + tristate "Amlogic Meson IR remote receiver" > + depends on RC_CORE > + depends on ARCH_MESON || COMPILE_TEST > + ---help--- > + Say Y if you want to use the IR remote receiver available > + on Amlogic Meson SoCs. > + > + To compile this driver as a module, choose M here: the > + module will be called meson-ir. > + > config IR_NUVOTON > tristate "Nuvoton w836x7hg Consumer Infrared Transceiver" > depends on PNP > diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile > index 8f509e0..379a5c0 100644 > --- a/drivers/media/rc/Makefile > +++ b/drivers/media/rc/Makefile > @@ -22,6 +22,7 @@ obj-$(CONFIG_IR_IMON) += imon.o > obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o > obj-$(CONFIG_IR_MCEUSB) += mceusb.o > obj-$(CONFIG_IR_FINTEK) += fintek-cir.o > +obj-$(CONFIG_IR_MESON) += meson-ir.o > obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o > obj-$(CONFIG_IR_ENE) += ene_ir.o > obj-$(CONFIG_IR_REDRAT3) += redrat3.o > diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c > new file mode 100644 > index 0000000..4d6aed1 > --- /dev/null > +++ b/drivers/media/rc/meson-ir.c > @@ -0,0 +1,215 @@ > +/* > + * Driver for Amlogic Meson IR remote receiver > + * > + * Copyright (C) 2014 Beniamino Galvani <b.galvani@xxxxxxxxx> > + * > + * 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); rc_unregister_device() already calls rc_free_device(). > +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@xxxxxxxxx>"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
