282 lines
6.3 KiB
C
282 lines
6.3 KiB
C
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/*
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* Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "tango-ir"
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#define IR_NEC_CTRL 0x00
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#define IR_NEC_DATA 0x04
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#define IR_CTRL 0x08
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#define IR_RC5_CLK_DIV 0x0c
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#define IR_RC5_DATA 0x10
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#define IR_INT 0x14
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#define NEC_TIME_BASE 560
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#define RC5_TIME_BASE 1778
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#define RC6_CTRL 0x00
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#define RC6_CLKDIV 0x04
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#define RC6_DATA0 0x08
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#define RC6_DATA1 0x0c
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#define RC6_DATA2 0x10
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#define RC6_DATA3 0x14
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#define RC6_DATA4 0x18
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#define RC6_CARRIER 36000
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#define RC6_TIME_BASE 16
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#define NEC_CAP(n) ((n) << 24)
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#define GPIO_SEL(n) ((n) << 16)
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#define DISABLE_NEC (BIT(4) | BIT(8))
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#define ENABLE_RC5 (BIT(0) | BIT(9))
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#define ENABLE_RC6 (BIT(0) | BIT(7))
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#define ACK_IR_INT (BIT(0) | BIT(1))
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#define ACK_RC6_INT (BIT(31))
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#define NEC_ANY (RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32)
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struct tango_ir {
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void __iomem *rc5_base;
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void __iomem *rc6_base;
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struct rc_dev *rc;
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struct clk *clk;
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};
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static void tango_ir_handle_nec(struct tango_ir *ir)
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{
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u32 v, code;
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enum rc_proto proto;
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v = readl_relaxed(ir->rc5_base + IR_NEC_DATA);
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if (!v) {
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rc_repeat(ir->rc);
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return;
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}
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code = ir_nec_bytes_to_scancode(v, v >> 8, v >> 16, v >> 24, &proto);
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rc_keydown(ir->rc, proto, code, 0);
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}
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static void tango_ir_handle_rc5(struct tango_ir *ir)
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{
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u32 data, field, toggle, addr, cmd, code;
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data = readl_relaxed(ir->rc5_base + IR_RC5_DATA);
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if (data & BIT(31))
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return;
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field = data >> 12 & 1;
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toggle = data >> 11 & 1;
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addr = data >> 6 & 0x1f;
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cmd = (data & 0x3f) | (field ^ 1) << 6;
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code = RC_SCANCODE_RC5(addr, cmd);
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rc_keydown(ir->rc, RC_PROTO_RC5, code, toggle);
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}
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static void tango_ir_handle_rc6(struct tango_ir *ir)
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{
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u32 data0, data1, toggle, mode, addr, cmd, code;
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data0 = readl_relaxed(ir->rc6_base + RC6_DATA0);
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data1 = readl_relaxed(ir->rc6_base + RC6_DATA1);
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mode = data0 >> 1 & 7;
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if (mode != 0)
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return;
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toggle = data0 & 1;
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addr = data0 >> 16;
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cmd = data1;
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code = RC_SCANCODE_RC6_0(addr, cmd);
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rc_keydown(ir->rc, RC_PROTO_RC6_0, code, toggle);
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}
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static irqreturn_t tango_ir_irq(int irq, void *dev_id)
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{
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struct tango_ir *ir = dev_id;
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unsigned int rc5_stat;
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unsigned int rc6_stat;
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rc5_stat = readl_relaxed(ir->rc5_base + IR_INT);
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writel_relaxed(rc5_stat, ir->rc5_base + IR_INT);
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rc6_stat = readl_relaxed(ir->rc6_base + RC6_CTRL);
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writel_relaxed(rc6_stat, ir->rc6_base + RC6_CTRL);
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if (!(rc5_stat & 3) && !(rc6_stat & BIT(31)))
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return IRQ_NONE;
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if (rc5_stat & BIT(0))
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tango_ir_handle_rc5(ir);
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if (rc5_stat & BIT(1))
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tango_ir_handle_nec(ir);
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if (rc6_stat & BIT(31))
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tango_ir_handle_rc6(ir);
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return IRQ_HANDLED;
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}
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static int tango_change_protocol(struct rc_dev *dev, u64 *rc_type)
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{
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struct tango_ir *ir = dev->priv;
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u32 rc5_ctrl = DISABLE_NEC;
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u32 rc6_ctrl = 0;
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if (*rc_type & NEC_ANY)
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rc5_ctrl = 0;
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if (*rc_type & RC_PROTO_BIT_RC5)
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rc5_ctrl |= ENABLE_RC5;
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if (*rc_type & RC_PROTO_BIT_RC6_0)
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rc6_ctrl = ENABLE_RC6;
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writel_relaxed(rc5_ctrl, ir->rc5_base + IR_CTRL);
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writel_relaxed(rc6_ctrl, ir->rc6_base + RC6_CTRL);
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return 0;
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}
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static int tango_ir_probe(struct platform_device *pdev)
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{
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const char *map_name = RC_MAP_TANGO;
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struct device *dev = &pdev->dev;
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struct rc_dev *rc;
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struct tango_ir *ir;
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struct resource *rc5_res;
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struct resource *rc6_res;
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u64 clkrate, clkdiv;
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int irq, err;
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u32 val;
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rc5_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!rc5_res)
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return -EINVAL;
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rc6_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!rc6_res)
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return -EINVAL;
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irq = platform_get_irq(pdev, 0);
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if (irq <= 0)
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return -EINVAL;
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ir = devm_kzalloc(dev, sizeof(*ir), GFP_KERNEL);
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if (!ir)
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return -ENOMEM;
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ir->rc5_base = devm_ioremap_resource(dev, rc5_res);
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if (IS_ERR(ir->rc5_base))
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return PTR_ERR(ir->rc5_base);
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ir->rc6_base = devm_ioremap_resource(dev, rc6_res);
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if (IS_ERR(ir->rc6_base))
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return PTR_ERR(ir->rc6_base);
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ir->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(ir->clk))
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return PTR_ERR(ir->clk);
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rc = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE);
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if (!rc)
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return -ENOMEM;
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of_property_read_string(dev->of_node, "linux,rc-map-name", &map_name);
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rc->device_name = DRIVER_NAME;
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rc->driver_name = DRIVER_NAME;
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rc->input_phys = DRIVER_NAME "/input0";
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rc->map_name = map_name;
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rc->allowed_protocols = NEC_ANY | RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_0;
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rc->change_protocol = tango_change_protocol;
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rc->priv = ir;
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ir->rc = rc;
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err = clk_prepare_enable(ir->clk);
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if (err)
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return err;
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clkrate = clk_get_rate(ir->clk);
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clkdiv = clkrate * NEC_TIME_BASE;
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do_div(clkdiv, 1000000);
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val = NEC_CAP(31) | GPIO_SEL(12) | clkdiv;
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writel_relaxed(val, ir->rc5_base + IR_NEC_CTRL);
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clkdiv = clkrate * RC5_TIME_BASE;
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do_div(clkdiv, 1000000);
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writel_relaxed(DISABLE_NEC, ir->rc5_base + IR_CTRL);
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writel_relaxed(clkdiv, ir->rc5_base + IR_RC5_CLK_DIV);
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writel_relaxed(ACK_IR_INT, ir->rc5_base + IR_INT);
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clkdiv = clkrate * RC6_TIME_BASE;
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do_div(clkdiv, RC6_CARRIER);
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writel_relaxed(ACK_RC6_INT, ir->rc6_base + RC6_CTRL);
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writel_relaxed((clkdiv >> 2) << 18 | clkdiv, ir->rc6_base + RC6_CLKDIV);
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err = devm_request_irq(dev, irq, tango_ir_irq, IRQF_SHARED,
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dev_name(dev), ir);
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if (err)
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goto err_clk;
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err = devm_rc_register_device(dev, rc);
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if (err)
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goto err_clk;
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platform_set_drvdata(pdev, ir);
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return 0;
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err_clk:
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clk_disable_unprepare(ir->clk);
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return err;
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}
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static int tango_ir_remove(struct platform_device *pdev)
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{
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struct tango_ir *ir = platform_get_drvdata(pdev);
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clk_disable_unprepare(ir->clk);
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return 0;
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}
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static const struct of_device_id tango_ir_dt_ids[] = {
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{ .compatible = "sigma,smp8642-ir" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tango_ir_dt_ids);
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static struct platform_driver tango_ir_driver = {
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.probe = tango_ir_probe,
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.remove = tango_ir_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = tango_ir_dt_ids,
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},
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};
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module_platform_driver(tango_ir_driver);
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MODULE_DESCRIPTION("SMP86xx IR decoder driver");
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MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
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MODULE_LICENSE("GPL");
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