drivers/media/rc/tango-ir.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
   4  */
   5
   6 #include <linux/input.h>
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/clk.h>
  12 #include <linux/of.h>
  13 #include <media/rc-core.h>
  14
  15 #define DRIVER_NAME "tango-ir"
  16
  17 #define IR_NEC_CTRL     0x00
  18 #define IR_NEC_DATA     0x04
  19 #define IR_CTRL         0x08
  20 #define IR_RC5_CLK_DIV  0x0c
  21 #define IR_RC5_DATA     0x10
  22 #define IR_INT          0x14
  23
  24 #define NEC_TIME_BASE   560
  25 #define RC5_TIME_BASE   1778
  26
  27 #define RC6_CTRL        0x00
  28 #define RC6_CLKDIV      0x04
  29 #define RC6_DATA0       0x08
  30 #define RC6_DATA1       0x0c
  31 #define RC6_DATA2       0x10
  32 #define RC6_DATA3       0x14
  33 #define RC6_DATA4       0x18
  34
  35 #define RC6_CARRIER     36000
  36 #define RC6_TIME_BASE   16
  37
  38 #define NEC_CAP(n)      ((n) << 24)
  39 #define GPIO_SEL(n)     ((n) << 16)
  40 #define DISABLE_NEC     (BIT(4) | BIT(8))
  41 #define ENABLE_RC5      (BIT(0) | BIT(9))
  42 #define ENABLE_RC6      (BIT(0) | BIT(7))
  43 #define ACK_IR_INT      (BIT(0) | BIT(1))
  44 #define ACK_RC6_INT     (BIT(31))
  45
  46 #define NEC_ANY (RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32)
  47
  48 struct tango_ir {
  49         void __iomem *rc5_base;
  50         void __iomem *rc6_base;
  51         struct rc_dev *rc;
  52         struct clk *clk;
  53 };
  54
  55 static void tango_ir_handle_nec(struct tango_ir *ir)
  56 {
  57         u32 v, code;
  58         enum rc_proto proto;
  59
  60         v = readl_relaxed(ir->rc5_base + IR_NEC_DATA);
  61         if (!v) {
  62                 rc_repeat(ir->rc);
  63                 return;
  64         }
  65
  66         code = ir_nec_bytes_to_scancode(v, v >> 8, v >> 16, v >> 24, &proto);
  67         rc_keydown(ir->rc, proto, code, 0);
  68 }
  69
  70 static void tango_ir_handle_rc5(struct tango_ir *ir)
  71 {
  72         u32 data, field, toggle, addr, cmd, code;
  73
  74         data = readl_relaxed(ir->rc5_base + IR_RC5_DATA);
  75         if (data & BIT(31))
  76                 return;
  77
  78         field = data >> 12 & 1;
  79         toggle = data >> 11 & 1;
  80         addr = data >> 6 & 0x1f;
  81         cmd = (data & 0x3f) | (field ^ 1) << 6;
  82
  83         code = RC_SCANCODE_RC5(addr, cmd);
  84         rc_keydown(ir->rc, RC_PROTO_RC5, code, toggle);
  85 }
  86
  87 static void tango_ir_handle_rc6(struct tango_ir *ir)
  88 {
  89         u32 data0, data1, toggle, mode, addr, cmd, code;
  90
  91         data0 = readl_relaxed(ir->rc6_base + RC6_DATA0);
  92         data1 = readl_relaxed(ir->rc6_base + RC6_DATA1);
  93
  94         mode = data0 >> 1 & 7;
  95         if (mode != 0)
  96                 return;
  97
  98         toggle = data0 & 1;
  99         addr = data0 >> 16;
 100         cmd = data1;
 101
 102         code = RC_SCANCODE_RC6_0(addr, cmd);
 103         rc_keydown(ir->rc, RC_PROTO_RC6_0, code, toggle);
 104 }
 105
 106 static irqreturn_t tango_ir_irq(int irq, void *dev_id)
 107 {
 108         struct tango_ir *ir = dev_id;
 109         unsigned int rc5_stat;
 110         unsigned int rc6_stat;
 111
 112         rc5_stat = readl_relaxed(ir->rc5_base + IR_INT);
 113         writel_relaxed(rc5_stat, ir->rc5_base + IR_INT);
 114
 115         rc6_stat = readl_relaxed(ir->rc6_base + RC6_CTRL);
 116         writel_relaxed(rc6_stat, ir->rc6_base + RC6_CTRL);
 117
 118         if (!(rc5_stat & 3) && !(rc6_stat & BIT(31)))
 119                 return IRQ_NONE;
 120
 121         if (rc5_stat & BIT(0))
 122                 tango_ir_handle_rc5(ir);
 123
 124         if (rc5_stat & BIT(1))
 125                 tango_ir_handle_nec(ir);
 126
 127         if (rc6_stat & BIT(31))
 128                 tango_ir_handle_rc6(ir);
 129
 130         return IRQ_HANDLED;
 131 }
 132
 133 static int tango_change_protocol(struct rc_dev *dev, u64 *rc_type)
 134 {
 135         struct tango_ir *ir = dev->priv;
 136         u32 rc5_ctrl = DISABLE_NEC;
 137         u32 rc6_ctrl = 0;
 138
 139         if (*rc_type & NEC_ANY)
 140                 rc5_ctrl = 0;
 141
 142         if (*rc_type & RC_PROTO_BIT_RC5)
 143                 rc5_ctrl |= ENABLE_RC5;
 144
 145         if (*rc_type & RC_PROTO_BIT_RC6_0)
 146                 rc6_ctrl = ENABLE_RC6;
 147
 148         writel_relaxed(rc5_ctrl, ir->rc5_base + IR_CTRL);
 149         writel_relaxed(rc6_ctrl, ir->rc6_base + RC6_CTRL);
 150
 151         return 0;
 152 }
 153
 154 static int tango_ir_probe(struct platform_device *pdev)
 155 {
 156         const char *map_name = RC_MAP_TANGO;
 157         struct device *dev = &pdev->dev;
 158         struct rc_dev *rc;
 159         struct tango_ir *ir;
 160         u64 clkrate, clkdiv;
 161         int irq, err;
 162         u32 val;
 163
 164         irq = platform_get_irq(pdev, 0);
 165         if (irq <= 0)
 166                 return -EINVAL;
 167
 168         ir = devm_kzalloc(dev, sizeof(*ir), GFP_KERNEL);
 169         if (!ir)
 170                 return -ENOMEM;
 171
 172         ir->rc5_base = devm_platform_ioremap_resource(pdev, 0);
 173         if (IS_ERR(ir->rc5_base))
 174                 return PTR_ERR(ir->rc5_base);
 175
 176         ir->rc6_base = devm_platform_ioremap_resource(pdev, 1);
 177         if (IS_ERR(ir->rc6_base))
 178                 return PTR_ERR(ir->rc6_base);
 179
 180         ir->clk = devm_clk_get(dev, NULL);
 181         if (IS_ERR(ir->clk))
 182                 return PTR_ERR(ir->clk);
 183
 184         rc = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE);
 185         if (!rc)
 186                 return -ENOMEM;
 187
 188         of_property_read_string(dev->of_node, "linux,rc-map-name", &map_name);
 189
 190         rc->device_name = DRIVER_NAME;
 191         rc->driver_name = DRIVER_NAME;
 192         rc->input_phys = DRIVER_NAME "/input0";
 193         rc->map_name = map_name;
 194         rc->allowed_protocols = NEC_ANY | RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_0;
 195         rc->change_protocol = tango_change_protocol;
 196         rc->priv = ir;
 197         ir->rc = rc;
 198
 199         err = clk_prepare_enable(ir->clk);
 200         if (err)
 201                 return err;
 202
 203         clkrate = clk_get_rate(ir->clk);
 204
 205         clkdiv = clkrate * NEC_TIME_BASE;
 206         do_div(clkdiv, 1000000);
 207
 208         val = NEC_CAP(31) | GPIO_SEL(12) | clkdiv;
 209         writel_relaxed(val, ir->rc5_base + IR_NEC_CTRL);
 210
 211         clkdiv = clkrate * RC5_TIME_BASE;
 212         do_div(clkdiv, 1000000);
 213
 214         writel_relaxed(DISABLE_NEC, ir->rc5_base + IR_CTRL);
 215         writel_relaxed(clkdiv, ir->rc5_base + IR_RC5_CLK_DIV);
 216         writel_relaxed(ACK_IR_INT, ir->rc5_base + IR_INT);
 217
 218         clkdiv = clkrate * RC6_TIME_BASE;
 219         do_div(clkdiv, RC6_CARRIER);
 220
 221         writel_relaxed(ACK_RC6_INT, ir->rc6_base + RC6_CTRL);
 222         writel_relaxed((clkdiv >> 2) << 18 | clkdiv, ir->rc6_base + RC6_CLKDIV);
 223
 224         err = devm_request_irq(dev, irq, tango_ir_irq, IRQF_SHARED,
 225                                dev_name(dev), ir);
 226         if (err)
 227                 goto err_clk;
 228
 229         err = devm_rc_register_device(dev, rc);
 230         if (err)
 231                 goto err_clk;
 232
 233         platform_set_drvdata(pdev, ir);
 234         return 0;
 235
 236 err_clk:
 237         clk_disable_unprepare(ir->clk);
 238         return err;
 239 }
 240
 241 static int tango_ir_remove(struct platform_device *pdev)
 242 {
 243         struct tango_ir *ir = platform_get_drvdata(pdev);
 244
 245         clk_disable_unprepare(ir->clk);
 246         return 0;
 247 }
 248
 249 static const struct of_device_id tango_ir_dt_ids[] = {
 250         { .compatible = "sigma,smp8642-ir" },
 251         { }
 252 };
 253 MODULE_DEVICE_TABLE(of, tango_ir_dt_ids);
 254
 255 static struct platform_driver tango_ir_driver = {
 256         .probe  = tango_ir_probe,
 257         .remove = tango_ir_remove,
 258         .driver = {
 259                 .name           = DRIVER_NAME,
 260                 .of_match_table = tango_ir_dt_ids,
 261         },
 262 };
 263 module_platform_driver(tango_ir_driver);
 264
 265 MODULE_DESCRIPTION("SMP86xx IR decoder driver");
 266 MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
 267 MODULE_LICENSE("GPL");