diff options
Diffstat (limited to 'drivers/media/rc/zx-irdec.c')
| -rw-r--r-- | drivers/media/rc/zx-irdec.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/media/rc/zx-irdec.c b/drivers/media/rc/zx-irdec.c new file mode 100644 index 000000000000..12d322ec8a29 --- /dev/null +++ b/drivers/media/rc/zx-irdec.c @@ -0,0 +1,184 @@ +/* + * Copyright (C) 2017 Sanechips Technology Co., Ltd. + * Copyright 2017 Linaro Ltd. + * + * 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. + */ + +#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 <media/rc-core.h> + +#define DRIVER_NAME "zx-irdec" + +#define ZX_IR_ENABLE 0x04 +#define ZX_IREN BIT(0) +#define ZX_IR_CTRL 0x08 +#define ZX_DEGL_MASK GENMASK(21, 20) +#define ZX_DEGL_VALUE(x) (((x) << 20) & ZX_DEGL_MASK) +#define ZX_WDBEGIN_MASK GENMASK(18, 8) +#define ZX_WDBEGIN_VALUE(x) (((x) << 8) & ZX_WDBEGIN_MASK) +#define ZX_IR_INTEN 0x10 +#define ZX_IR_INTSTCLR 0x14 +#define ZX_IR_CODE 0x30 +#define ZX_IR_CNUM 0x34 +#define ZX_NECRPT BIT(16) + +struct zx_irdec { + void __iomem *base; + struct rc_dev *rcd; +}; + +static void zx_irdec_set_mask(struct zx_irdec *irdec, unsigned int reg, + u32 mask, u32 value) +{ + u32 data; + + data = readl(irdec->base + reg); + data &= ~mask; + data |= value & mask; + writel(data, irdec->base + reg); +} + +static irqreturn_t zx_irdec_irq(int irq, void *dev_id) +{ + struct zx_irdec *irdec = dev_id; + u8 address, not_address; + u8 command, not_command; + u32 rawcode, scancode; + enum rc_proto rc_proto; + + /* Clear interrupt */ + writel(1, irdec->base + ZX_IR_INTSTCLR); + + /* Check repeat frame */ + if (readl(irdec->base + ZX_IR_CNUM) & ZX_NECRPT) { + rc_repeat(irdec->rcd); + goto done; + } + + rawcode = readl(irdec->base + ZX_IR_CODE); + not_command = (rawcode >> 24) & 0xff; + command = (rawcode >> 16) & 0xff; + not_address = (rawcode >> 8) & 0xff; + address = rawcode & 0xff; + + scancode = ir_nec_bytes_to_scancode(address, not_address, + command, not_command, + &rc_proto); + rc_keydown(irdec->rcd, rc_proto, scancode, 0); + +done: + return IRQ_HANDLED; +} + +static int zx_irdec_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct zx_irdec *irdec; + struct resource *res; + struct rc_dev *rcd; + int irq; + int ret; + + irdec = devm_kzalloc(dev, sizeof(*irdec), GFP_KERNEL); + if (!irdec) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irdec->base = devm_ioremap_resource(dev, res); + if (IS_ERR(irdec->base)) + return PTR_ERR(irdec->base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + rcd = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE); + if (!rcd) { + dev_err(dev, "failed to allocate rc device\n"); + return -ENOMEM; + } + + irdec->rcd = rcd; + + rcd->priv = irdec; + rcd->input_phys = DRIVER_NAME "/input0"; + rcd->input_id.bustype = BUS_HOST; + rcd->map_name = RC_MAP_ZX_IRDEC; + rcd->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | + RC_PROTO_BIT_NEC32; + rcd->driver_name = DRIVER_NAME; + rcd->device_name = DRIVER_NAME; + + platform_set_drvdata(pdev, irdec); + + ret = devm_rc_register_device(dev, rcd); + if (ret) { + dev_err(dev, "failed to register rc device\n"); + return ret; + } + + ret = devm_request_irq(dev, irq, zx_irdec_irq, 0, NULL, irdec); + if (ret) { + dev_err(dev, "failed to request irq\n"); + return ret; + } + + /* + * Initialize deglitch level and watchdog counter beginner as + * recommended by vendor BSP code. + */ + zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_DEGL_MASK, ZX_DEGL_VALUE(0)); + zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_WDBEGIN_MASK, + ZX_WDBEGIN_VALUE(0x21c)); + + /* Enable interrupt */ + writel(1, irdec->base + ZX_IR_INTEN); + + /* Enable the decoder */ + zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, ZX_IREN); + + return 0; +} + +static int zx_irdec_remove(struct platform_device *pdev) +{ + struct zx_irdec *irdec = platform_get_drvdata(pdev); + + /* Disable the decoder */ + zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, 0); + + /* Disable interrupt */ + writel(0, irdec->base + ZX_IR_INTEN); + + return 0; +} + +static const struct of_device_id zx_irdec_match[] = { + { .compatible = "zte,zx296718-irdec" }, + { }, +}; +MODULE_DEVICE_TABLE(of, zx_irdec_match); + +static struct platform_driver zx_irdec_driver = { + .probe = zx_irdec_probe, + .remove = zx_irdec_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = zx_irdec_match, + }, +}; +module_platform_driver(zx_irdec_driver); + +MODULE_DESCRIPTION("ZTE ZX IR remote control driver"); +MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); +MODULE_LICENSE("GPL v2"); |