diff options
Diffstat (limited to 'drivers/media/rc/mtk-cir.c')
| -rw-r--r-- | drivers/media/rc/mtk-cir.c | 93 |
1 files changed, 42 insertions, 51 deletions
diff --git a/drivers/media/rc/mtk-cir.c b/drivers/media/rc/mtk-cir.c index 31b7bb431497..85c9436b0a20 100644 --- a/drivers/media/rc/mtk-cir.c +++ b/drivers/media/rc/mtk-cir.c @@ -1,23 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Mediatek IR Receiver Controller * * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.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 <linux/io.h> +#include <linux/of.h> +#include <linux/platform_device.h> #include <linux/reset.h> #include <media/rc-core.h> @@ -33,7 +26,8 @@ * Register to setting ok count whose unit based on hardware sampling period * indicating IR receiving completion and then making IRQ fires */ -#define MTK_OK_COUNT(x) (((x) & GENMASK(23, 16)) << 16) +#define MTK_OK_COUNT_MASK (GENMASK(22, 16)) +#define MTK_OK_COUNT(x) ((x) << 16) /* Bit to enable IR hardware function */ #define MTK_IR_EN BIT(0) @@ -44,6 +38,11 @@ /* Fields containing pulse width data */ #define MTK_WIDTH_MASK (GENMASK(7, 0)) +/* IR threshold */ +#define MTK_IRTHD 0x14 +#define MTK_DG_CNT_MASK (GENMASK(12, 8)) +#define MTK_DG_CNT(x) ((x) << 8) + /* Bit to enable interrupt */ #define MTK_IRINT_EN BIT(0) @@ -56,8 +55,8 @@ #define MTK_IR_END(v, p) ((v) == MTK_MAX_SAMPLES && (p) == 0) /* Number of registers to record the pulse width */ #define MTK_CHKDATA_SZ 17 -/* Sample period in ns */ -#define MTK_IR_SAMPLE 46000 +/* Sample period in us */ +#define MTK_IR_SAMPLE 46 enum mtk_fields { /* Register to setting software sampling period */ @@ -155,15 +154,12 @@ static inline u32 mtk_chk_period(struct mtk_ir *ir) { u32 val; - /* Period of raw software sampling in ns */ - val = DIV_ROUND_CLOSEST(1000000000ul, - clk_get_rate(ir->bus) / ir->data->div); - /* * Period for software decoder used in the * unit of raw software sampling */ - val = DIV_ROUND_CLOSEST(MTK_IR_SAMPLE, val); + val = DIV_ROUND_CLOSEST(clk_get_rate(ir->bus), + USEC_PER_SEC * ir->data->div / MTK_IR_SAMPLE); dev_dbg(ir->dev, "@pwm clk = \t%lu\n", clk_get_rate(ir->bus) / ir->data->div); @@ -209,25 +205,24 @@ static inline void mtk_irq_enable(struct mtk_ir *ir, u32 mask) static irqreturn_t mtk_ir_irq(int irqno, void *dev_id) { + struct ir_raw_event rawir = {}; struct mtk_ir *ir = dev_id; - u8 wid = 0; u32 i, j, val; - struct ir_raw_event rawir = {}; + u8 wid; /* - * Reset decoder state machine explicitly is required - * because 1) the longest duration for space MTK IR hardware - * could record is not safely long. e.g 12ms if rx resolution - * is 46us by default. There is still the risk to satisfying - * every decoder to reset themselves through long enough - * trailing spaces and 2) the IRQ handler guarantees that - * start of IR message is always contained in and starting - * from register mtk_chkdata_reg(ir, i). + * Each pulse and space is encoded as a single byte, each byte + * alternating between pulse and space. If a pulse or space is longer + * than can be encoded in a single byte, it is encoded as the maximum + * value 0xff. + * + * If a space is longer than ok_count (about 23ms), the value is + * encoded as zero, and all following bytes are zero. Any IR that + * follows will be presented in the next interrupt. + * + * If there are more than 68 (=MTK_CHKDATA_SZ * 4) pulses and spaces, + * then the only the first 68 will be presented; the rest is lost. */ - ir_raw_event_reset(ir->rc); - - /* First message must be pulse */ - rawir.pulse = false; /* Handle all pulse and space IR controller captures */ for (i = 0 ; i < MTK_CHKDATA_SZ ; i++) { @@ -235,7 +230,8 @@ static irqreturn_t mtk_ir_irq(int irqno, void *dev_id) dev_dbg(ir->dev, "@reg%d=0x%08x\n", i, val); for (j = 0 ; j < 4 ; j++) { - wid = (val & (MTK_WIDTH_MASK << j * 8)) >> j * 8; + wid = val & MTK_WIDTH_MASK; + val >>= 8; rawir.pulse = !rawir.pulse; rawir.duration = wid * (MTK_IR_SAMPLE + 1); ir_raw_event_store_with_filter(ir->rc, &rawir); @@ -275,7 +271,7 @@ static irqreturn_t mtk_ir_irq(int irqno, void *dev_id) static const struct mtk_ir_data mt7623_data = { .regs = mt7623_regs, .fields = mt7623_fields, - .ok_count = 0xf, + .ok_count = 3, .hw_period = 0xff, .div = 4, }; @@ -283,7 +279,7 @@ static const struct mtk_ir_data mt7623_data = { static const struct mtk_ir_data mt7622_data = { .regs = mt7622_regs, .fields = mt7622_fields, - .ok_count = 0xf, + .ok_count = 3, .hw_period = 0xffff, .div = 32, }; @@ -299,7 +295,6 @@ static int mtk_ir_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *dn = dev->of_node; - struct resource *res; struct mtk_ir *ir; u32 val; int ret = 0; @@ -327,12 +322,9 @@ static int mtk_ir_probe(struct platform_device *pdev) ir->bus = ir->clk; } - 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"); + ir->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ir->base)) return PTR_ERR(ir->base); - } ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); if (!ir->rc) { @@ -351,7 +343,7 @@ static int mtk_ir_probe(struct platform_device *pdev) ir->rc->map_name = map_name ?: RC_MAP_EMPTY; ir->rc->dev.parent = dev; ir->rc->driver_name = MTK_IR_DEV; - ir->rc->allowed_protocols = RC_PROTO_BIT_ALL; + ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; ir->rc->rx_resolution = MTK_IR_SAMPLE; ir->rc->timeout = MTK_MAX_SAMPLES * (MTK_IR_SAMPLE + 1); @@ -364,10 +356,8 @@ static int mtk_ir_probe(struct platform_device *pdev) platform_set_drvdata(pdev, ir); ir->irq = platform_get_irq(pdev, 0); - if (ir->irq < 0) { - dev_err(dev, "no irq resource\n"); + if (ir->irq < 0) return -ENODEV; - } if (clk_prepare_enable(ir->clk)) { dev_err(dev, "try to enable ir_clk failed\n"); @@ -409,15 +399,18 @@ static int mtk_ir_probe(struct platform_device *pdev) mtk_w32_mask(ir, val, ir->data->fields[MTK_HW_PERIOD].mask, ir->data->fields[MTK_HW_PERIOD].reg); + /* Set de-glitch counter */ + mtk_w32_mask(ir, MTK_DG_CNT(1), MTK_DG_CNT_MASK, MTK_IRTHD); + /* Enable IR and PWM */ - val = mtk_r32(ir, MTK_CONFIG_HIGH_REG); + val = mtk_r32(ir, MTK_CONFIG_HIGH_REG) & ~MTK_OK_COUNT_MASK; val |= MTK_OK_COUNT(ir->data->ok_count) | MTK_PWM_EN | MTK_IR_EN; mtk_w32(ir, val, MTK_CONFIG_HIGH_REG); mtk_irq_enable(ir, MTK_IRINT_EN); dev_info(dev, "Initialized MT7623 IR driver, sample period = %dus\n", - DIV_ROUND_CLOSEST(MTK_IR_SAMPLE, 1000)); + MTK_IR_SAMPLE); return 0; @@ -429,7 +422,7 @@ exit_clkdisable_clk: return ret; } -static int mtk_ir_remove(struct platform_device *pdev) +static void mtk_ir_remove(struct platform_device *pdev) { struct mtk_ir *ir = platform_get_drvdata(pdev); @@ -443,8 +436,6 @@ static int mtk_ir_remove(struct platform_device *pdev) clk_disable_unprepare(ir->bus); clk_disable_unprepare(ir->clk); - - return 0; } static struct platform_driver mtk_ir_driver = { |