diff options
Diffstat (limited to 'drivers/media/rc/sunxi-cir.c')
| -rw-r--r-- | drivers/media/rc/sunxi-cir.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c new file mode 100644 index 000000000000..bcee8e1a4e9e --- /dev/null +++ b/drivers/media/rc/sunxi-cir.c @@ -0,0 +1,318 @@ +/* + * Driver for Allwinner sunXi IR controller + * + * Copyright (C) 2014 Alexsey Shestacov <wingrime@linux-sunxi.org> + * Copyright (C) 2014 Alexander Bersenev <bay@hackerdom.ru> + * + * Based on sun5i-ir.c: + * Copyright (C) 2007-2012 Daniel Wang + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <media/rc-core.h> + +#define SUNXI_IR_DEV "sunxi-ir" + +/* Registers */ +/* IR Control */ +#define SUNXI_IR_CTL_REG 0x00 +/* Global Enable */ +#define REG_CTL_GEN BIT(0) +/* RX block enable */ +#define REG_CTL_RXEN BIT(1) +/* CIR mode */ +#define REG_CTL_MD (BIT(4) | BIT(5)) + +/* Rx Config */ +#define SUNXI_IR_RXCTL_REG 0x10 +/* Pulse Polarity Invert flag */ +#define REG_RXCTL_RPPI BIT(2) + +/* Rx Data */ +#define SUNXI_IR_RXFIFO_REG 0x20 + +/* Rx Interrupt Enable */ +#define SUNXI_IR_RXINT_REG 0x2C +/* Rx FIFO Overflow */ +#define REG_RXINT_ROI_EN BIT(0) +/* Rx Packet End */ +#define REG_RXINT_RPEI_EN BIT(1) +/* Rx FIFO Data Available */ +#define REG_RXINT_RAI_EN BIT(4) + +/* Rx FIFO available byte level */ +#define REG_RXINT_RAL(val) (((val) << 8) & (GENMASK(11, 8))) + +/* Rx Interrupt Status */ +#define SUNXI_IR_RXSTA_REG 0x30 +/* RX FIFO Get Available Counter */ +#define REG_RXSTA_GET_AC(val) (((val) >> 8) & (GENMASK(5, 0))) +/* Clear all interrupt status value */ +#define REG_RXSTA_CLEARALL 0xff + +/* IR Sample Config */ +#define SUNXI_IR_CIR_REG 0x34 +/* CIR_REG register noise threshold */ +#define REG_CIR_NTHR(val) (((val) << 2) & (GENMASK(7, 2))) +/* CIR_REG register idle threshold */ +#define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8))) + +/* Hardware supported fifo size */ +#define SUNXI_IR_FIFO_SIZE 16 +/* How many messages in FIFO trigger IRQ */ +#define TRIGGER_LEVEL 8 +/* Required frequency for IR0 or IR1 clock in CIR mode */ +#define SUNXI_IR_BASE_CLK 8000000 +/* Frequency after IR internal divider */ +#define SUNXI_IR_CLK (SUNXI_IR_BASE_CLK / 64) +/* Sample period in ns */ +#define SUNXI_IR_SAMPLE (1000000000ul / SUNXI_IR_CLK) +/* Noise threshold in samples */ +#define SUNXI_IR_RXNOISE 1 +/* Idle Threshold in samples */ +#define SUNXI_IR_RXIDLE 20 +/* Time after which device stops sending data in ms */ +#define SUNXI_IR_TIMEOUT 120 + +struct sunxi_ir { + spinlock_t ir_lock; + struct rc_dev *rc; + void __iomem *base; + int irq; + struct clk *clk; + struct clk *apb_clk; + const char *map_name; +}; + +static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id) +{ + unsigned long status; + unsigned char dt; + unsigned int cnt, rc; + struct sunxi_ir *ir = dev_id; + DEFINE_IR_RAW_EVENT(rawir); + + spin_lock(&ir->ir_lock); + + status = readl(ir->base + SUNXI_IR_RXSTA_REG); + + /* clean all pending statuses */ + writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); + + if (status & REG_RXINT_RAI_EN) { + /* How many messages in fifo */ + rc = REG_RXSTA_GET_AC(status); + /* Sanity check */ + rc = rc > SUNXI_IR_FIFO_SIZE ? SUNXI_IR_FIFO_SIZE : rc; + /* If we have data */ + for (cnt = 0; cnt < rc; cnt++) { + /* for each bit in fifo */ + dt = readb(ir->base + SUNXI_IR_RXFIFO_REG); + rawir.pulse = (dt & 0x80) != 0; + rawir.duration = ((dt & 0x7f) + 1) * SUNXI_IR_SAMPLE; + ir_raw_event_store_with_filter(ir->rc, &rawir); + } + } + + if (status & REG_RXINT_ROI_EN) { + ir_raw_event_reset(ir->rc); + } else if (status & REG_RXINT_RPEI_EN) { + ir_raw_event_set_idle(ir->rc, true); + ir_raw_event_handle(ir->rc); + } + + spin_unlock(&ir->ir_lock); + + return IRQ_HANDLED; +} + +static int sunxi_ir_probe(struct platform_device *pdev) +{ + int ret = 0; + unsigned long tmp = 0; + + struct device *dev = &pdev->dev; + struct device_node *dn = dev->of_node; + struct resource *res; + struct sunxi_ir *ir; + + ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL); + if (!ir) + return -ENOMEM; + + /* Clock */ + ir->apb_clk = devm_clk_get(dev, "apb"); + if (IS_ERR(ir->apb_clk)) { + dev_err(dev, "failed to get a apb clock.\n"); + return PTR_ERR(ir->apb_clk); + } + ir->clk = devm_clk_get(dev, "ir"); + if (IS_ERR(ir->clk)) { + dev_err(dev, "failed to get a ir clock.\n"); + return PTR_ERR(ir->clk); + } + + ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK); + if (ret) { + dev_err(dev, "set ir base clock failed!\n"); + return ret; + } + + if (clk_prepare_enable(ir->apb_clk)) { + dev_err(dev, "try to enable apb_ir_clk failed\n"); + return -EINVAL; + } + + if (clk_prepare_enable(ir->clk)) { + dev_err(dev, "try to enable ir_clk failed\n"); + ret = -EINVAL; + goto exit_clkdisable_apb_clk; + } + + /* IO */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ir->base = devm_ioremap_resource(dev, res); + if (IS_ERR(ir->base)) { + dev_err(dev, "failed to map registers\n"); + ret = PTR_ERR(ir->base); + goto exit_clkdisable_clk; + } + + ir->rc = rc_allocate_device(); + if (!ir->rc) { + dev_err(dev, "failed to allocate device\n"); + ret = -ENOMEM; + goto exit_clkdisable_clk; + } + + ir->rc->priv = ir; + ir->rc->input_name = SUNXI_IR_DEV; + ir->rc->input_phys = "sunxi-ir/input0"; + ir->rc->input_id.bustype = BUS_HOST; + ir->rc->input_id.vendor = 0x0001; + ir->rc->input_id.product = 0x0001; + ir->rc->input_id.version = 0x0100; + ir->map_name = of_get_property(dn, "linux,rc-map-name", NULL); + ir->rc->map_name = ir->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 = SUNXI_IR_SAMPLE; + ir->rc->timeout = MS_TO_NS(SUNXI_IR_TIMEOUT); + ir->rc->driver_name = SUNXI_IR_DEV; + + ret = rc_register_device(ir->rc); + if (ret) { + dev_err(dev, "failed to register rc device\n"); + goto exit_free_dev; + } + + platform_set_drvdata(pdev, ir); + + /* IRQ */ + ir->irq = platform_get_irq(pdev, 0); + if (ir->irq < 0) { + dev_err(dev, "no irq resource\n"); + ret = ir->irq; + goto exit_free_dev; + } + + ret = devm_request_irq(dev, ir->irq, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir); + if (ret) { + dev_err(dev, "failed request irq\n"); + goto exit_free_dev; + } + + /* Enable CIR Mode */ + writel(REG_CTL_MD, ir->base+SUNXI_IR_CTL_REG); + + /* Set noise threshold and idle threshold */ + writel(REG_CIR_NTHR(SUNXI_IR_RXNOISE)|REG_CIR_ITHR(SUNXI_IR_RXIDLE), + ir->base + SUNXI_IR_CIR_REG); + + /* Invert Input Signal */ + writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG); + + /* Clear All Rx Interrupt Status */ + writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); + + /* + * Enable IRQ on overflow, packet end, FIFO available with trigger + * level + */ + writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN | + REG_RXINT_RAI_EN | REG_RXINT_RAL(TRIGGER_LEVEL - 1), + ir->base + SUNXI_IR_RXINT_REG); + + /* Enable IR Module */ + tmp = readl(ir->base + SUNXI_IR_CTL_REG); + writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG); + + dev_info(dev, "initialized sunXi IR driver\n"); + return 0; + +exit_free_dev: + rc_free_device(ir->rc); +exit_clkdisable_clk: + clk_disable_unprepare(ir->clk); +exit_clkdisable_apb_clk: + clk_disable_unprepare(ir->apb_clk); + + return ret; +} + +static int sunxi_ir_remove(struct platform_device *pdev) +{ + unsigned long flags; + struct sunxi_ir *ir = platform_get_drvdata(pdev); + + clk_disable_unprepare(ir->clk); + clk_disable_unprepare(ir->apb_clk); + + spin_lock_irqsave(&ir->ir_lock, flags); + /* disable IR IRQ */ + writel(0, ir->base + SUNXI_IR_RXINT_REG); + /* clear All Rx Interrupt Status */ + writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); + /* disable IR */ + writel(0, ir->base + SUNXI_IR_CTL_REG); + spin_unlock_irqrestore(&ir->ir_lock, flags); + + rc_unregister_device(ir->rc); + return 0; +} + +static const struct of_device_id sunxi_ir_match[] = { + { .compatible = "allwinner,sun4i-a10-ir", }, + {}, +}; + +static struct platform_driver sunxi_ir_driver = { + .probe = sunxi_ir_probe, + .remove = sunxi_ir_remove, + .driver = { + .name = SUNXI_IR_DEV, + .owner = THIS_MODULE, + .of_match_table = sunxi_ir_match, + }, +}; + +module_platform_driver(sunxi_ir_driver); + +MODULE_DESCRIPTION("Allwinner sunXi IR controller driver"); +MODULE_AUTHOR("Alexsey Shestacov <wingrime@linux-sunxi.org>"); +MODULE_LICENSE("GPL"); |