1 /* 2 * Driver for Amlogic Meson IR remote receiver 3 * 4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * You should have received a copy of the GNU General Public License 11 * along with this program. If not, see <http://www.gnu.org/licenses/>. 12 */ 13 14 #include <linux/device.h> 15 #include <linux/err.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/of_platform.h> 20 #include <linux/platform_device.h> 21 #include <linux/spinlock.h> 22 23 #include <media/rc-core.h> 24 25 #define DRIVER_NAME "meson-ir" 26 27 #define IR_DEC_LDR_ACTIVE 0x00 28 #define IR_DEC_LDR_IDLE 0x04 29 #define IR_DEC_LDR_REPEAT 0x08 30 #define IR_DEC_BIT_0 0x0c 31 #define IR_DEC_REG0 0x10 32 #define IR_DEC_FRAME 0x14 33 #define IR_DEC_STATUS 0x18 34 #define IR_DEC_REG1 0x1c 35 36 #define REG0_RATE_MASK (BIT(11) - 1) 37 38 #define REG1_MODE_MASK (BIT(7) | BIT(8)) 39 #define REG1_MODE_NEC (0 << 7) 40 #define REG1_MODE_GENERAL (2 << 7) 41 42 #define REG1_TIME_IV_SHIFT 16 43 #define REG1_TIME_IV_MASK ((BIT(13) - 1) << REG1_TIME_IV_SHIFT) 44 45 #define REG1_IRQSEL_MASK (BIT(2) | BIT(3)) 46 #define REG1_IRQSEL_NEC_MODE (0 << 2) 47 #define REG1_IRQSEL_RISE_FALL (1 << 2) 48 #define REG1_IRQSEL_FALL (2 << 2) 49 #define REG1_IRQSEL_RISE (3 << 2) 50 51 #define REG1_RESET BIT(0) 52 #define REG1_ENABLE BIT(15) 53 54 #define STATUS_IR_DEC_IN BIT(8) 55 56 #define MESON_TRATE 10 /* us */ 57 58 struct meson_ir { 59 void __iomem *reg; 60 struct rc_dev *rc; 61 int irq; 62 spinlock_t lock; 63 }; 64 65 static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg, 66 u32 mask, u32 value) 67 { 68 u32 data; 69 70 data = readl(ir->reg + reg); 71 data &= ~mask; 72 data |= (value & mask); 73 writel(data, ir->reg + reg); 74 } 75 76 static irqreturn_t meson_ir_irq(int irqno, void *dev_id) 77 { 78 struct meson_ir *ir = dev_id; 79 u32 duration; 80 DEFINE_IR_RAW_EVENT(rawir); 81 82 spin_lock(&ir->lock); 83 84 duration = readl(ir->reg + IR_DEC_REG1); 85 duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT; 86 rawir.duration = US_TO_NS(duration * MESON_TRATE); 87 88 rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN); 89 90 ir_raw_event_store_with_filter(ir->rc, &rawir); 91 ir_raw_event_handle(ir->rc); 92 93 spin_unlock(&ir->lock); 94 95 return IRQ_HANDLED; 96 } 97 98 static int meson_ir_probe(struct platform_device *pdev) 99 { 100 struct device *dev = &pdev->dev; 101 struct device_node *node = dev->of_node; 102 struct resource *res; 103 const char *map_name; 104 struct meson_ir *ir; 105 int ret; 106 107 ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL); 108 if (!ir) 109 return -ENOMEM; 110 111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 112 ir->reg = devm_ioremap_resource(dev, res); 113 if (IS_ERR(ir->reg)) { 114 dev_err(dev, "failed to map registers\n"); 115 return PTR_ERR(ir->reg); 116 } 117 118 ir->irq = platform_get_irq(pdev, 0); 119 if (ir->irq < 0) { 120 dev_err(dev, "no irq resource\n"); 121 return ir->irq; 122 } 123 124 ir->rc = rc_allocate_device(); 125 if (!ir->rc) { 126 dev_err(dev, "failed to allocate rc device\n"); 127 return -ENOMEM; 128 } 129 130 ir->rc->priv = ir; 131 ir->rc->input_name = DRIVER_NAME; 132 ir->rc->input_phys = DRIVER_NAME "/input0"; 133 ir->rc->input_id.bustype = BUS_HOST; 134 map_name = of_get_property(node, "linux,rc-map-name", NULL); 135 ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY; 136 ir->rc->dev.parent = dev; 137 ir->rc->driver_type = RC_DRIVER_IR_RAW; 138 ir->rc->allowed_protocols = RC_BIT_ALL; 139 ir->rc->rx_resolution = US_TO_NS(MESON_TRATE); 140 ir->rc->timeout = MS_TO_NS(200); 141 ir->rc->driver_name = DRIVER_NAME; 142 143 spin_lock_init(&ir->lock); 144 platform_set_drvdata(pdev, ir); 145 146 ret = rc_register_device(ir->rc); 147 if (ret) { 148 dev_err(dev, "failed to register rc device\n"); 149 goto out_free; 150 } 151 152 ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir); 153 if (ret) { 154 dev_err(dev, "failed to request irq\n"); 155 goto out_unreg; 156 } 157 158 /* Reset the decoder */ 159 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET); 160 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0); 161 /* Set general operation mode */ 162 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, REG1_MODE_GENERAL); 163 /* Set rate */ 164 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1); 165 /* IRQ on rising and falling edges */ 166 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK, 167 REG1_IRQSEL_RISE_FALL); 168 /* Enable the decoder */ 169 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE); 170 171 dev_info(dev, "receiver initialized\n"); 172 173 return 0; 174 out_unreg: 175 rc_unregister_device(ir->rc); 176 ir->rc = NULL; 177 out_free: 178 rc_free_device(ir->rc); 179 180 return ret; 181 } 182 183 static int meson_ir_remove(struct platform_device *pdev) 184 { 185 struct meson_ir *ir = platform_get_drvdata(pdev); 186 unsigned long flags; 187 188 /* Disable the decoder */ 189 spin_lock_irqsave(&ir->lock, flags); 190 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0); 191 spin_unlock_irqrestore(&ir->lock, flags); 192 193 rc_unregister_device(ir->rc); 194 195 return 0; 196 } 197 198 static const struct of_device_id meson_ir_match[] = { 199 { .compatible = "amlogic,meson6-ir" }, 200 { }, 201 }; 202 203 static struct platform_driver meson_ir_driver = { 204 .probe = meson_ir_probe, 205 .remove = meson_ir_remove, 206 .driver = { 207 .name = DRIVER_NAME, 208 .of_match_table = meson_ir_match, 209 }, 210 }; 211 212 module_platform_driver(meson_ir_driver); 213 214 MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver"); 215 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 216 MODULE_LICENSE("GPL v2"); 217