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