1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SMI PCIe driver for DVBSky cards. 4 * 5 * Copyright (C) 2014 Max nibble <nibble.max@gmail.com> 6 */ 7 8 #include "smipcie.h" 9 10 #define SMI_SAMPLE_PERIOD 83 11 #define SMI_SAMPLE_IDLEMIN (10000 / SMI_SAMPLE_PERIOD) 12 13 static void smi_ir_enableInterrupt(struct smi_rc *ir) 14 { 15 struct smi_dev *dev = ir->dev; 16 17 smi_write(MSI_INT_ENA_SET, IR_X_INT); 18 } 19 20 static void smi_ir_disableInterrupt(struct smi_rc *ir) 21 { 22 struct smi_dev *dev = ir->dev; 23 24 smi_write(MSI_INT_ENA_CLR, IR_X_INT); 25 } 26 27 static void smi_ir_clearInterrupt(struct smi_rc *ir) 28 { 29 struct smi_dev *dev = ir->dev; 30 31 smi_write(MSI_INT_STATUS_CLR, IR_X_INT); 32 } 33 34 static void smi_ir_stop(struct smi_rc *ir) 35 { 36 struct smi_dev *dev = ir->dev; 37 38 smi_ir_disableInterrupt(ir); 39 smi_clear(IR_Init_Reg, rbIRen); 40 } 41 42 static void smi_raw_process(struct rc_dev *rc_dev, const u8 *buffer, 43 const u8 length) 44 { 45 struct ir_raw_event rawir = {}; 46 int cnt; 47 48 for (cnt = 0; cnt < length; cnt++) { 49 if (buffer[cnt] & 0x7f) { 50 rawir.pulse = (buffer[cnt] & 0x80) == 0; 51 rawir.duration = ((buffer[cnt] & 0x7f) + 52 (rawir.pulse ? 0 : -1)) * 53 rc_dev->rx_resolution; 54 ir_raw_event_store_with_filter(rc_dev, &rawir); 55 } 56 } 57 } 58 59 static void smi_ir_decode(struct smi_rc *ir) 60 { 61 struct smi_dev *dev = ir->dev; 62 struct rc_dev *rc_dev = ir->rc_dev; 63 u32 dwIRControl, dwIRData; 64 u8 index, ucIRCount, readLoop; 65 66 dwIRControl = smi_read(IR_Init_Reg); 67 68 if (dwIRControl & rbIRVld) { 69 ucIRCount = (u8) smi_read(IR_Data_Cnt); 70 71 readLoop = ucIRCount/4; 72 if (ucIRCount % 4) 73 readLoop += 1; 74 for (index = 0; index < readLoop; index++) { 75 dwIRData = smi_read(IR_DATA_BUFFER_BASE + (index * 4)); 76 77 ir->irData[index*4 + 0] = (u8)(dwIRData); 78 ir->irData[index*4 + 1] = (u8)(dwIRData >> 8); 79 ir->irData[index*4 + 2] = (u8)(dwIRData >> 16); 80 ir->irData[index*4 + 3] = (u8)(dwIRData >> 24); 81 } 82 smi_raw_process(rc_dev, ir->irData, ucIRCount); 83 smi_set(IR_Init_Reg, rbIRVld); 84 } 85 86 if (dwIRControl & rbIRhighidle) { 87 struct ir_raw_event rawir = {}; 88 89 rawir.pulse = 0; 90 rawir.duration = SMI_SAMPLE_PERIOD * SMI_SAMPLE_IDLEMIN; 91 ir_raw_event_store_with_filter(rc_dev, &rawir); 92 smi_set(IR_Init_Reg, rbIRhighidle); 93 } 94 95 ir_raw_event_handle(rc_dev); 96 } 97 98 /* ir functions call by main driver.*/ 99 int smi_ir_irq(struct smi_rc *ir, u32 int_status) 100 { 101 int handled = 0; 102 103 if (int_status & IR_X_INT) { 104 smi_ir_disableInterrupt(ir); 105 smi_ir_clearInterrupt(ir); 106 smi_ir_decode(ir); 107 smi_ir_enableInterrupt(ir); 108 handled = 1; 109 } 110 return handled; 111 } 112 113 void smi_ir_start(struct smi_rc *ir) 114 { 115 struct smi_dev *dev = ir->dev; 116 117 smi_write(IR_Idle_Cnt_Low, 118 (((SMI_SAMPLE_PERIOD - 1) & 0xFFFF) << 16) | 119 (SMI_SAMPLE_IDLEMIN & 0xFFFF)); 120 msleep(20); 121 smi_set(IR_Init_Reg, rbIRen | rbIRhighidle); 122 123 smi_ir_enableInterrupt(ir); 124 } 125 126 int smi_ir_init(struct smi_dev *dev) 127 { 128 int ret; 129 struct rc_dev *rc_dev; 130 struct smi_rc *ir = &dev->ir; 131 132 rc_dev = rc_allocate_device(RC_DRIVER_IR_RAW); 133 if (!rc_dev) 134 return -ENOMEM; 135 136 /* init input device */ 137 snprintf(ir->device_name, sizeof(ir->device_name), "IR (%s)", 138 dev->info->name); 139 snprintf(ir->input_phys, sizeof(ir->input_phys), "pci-%s/ir0", 140 pci_name(dev->pci_dev)); 141 142 rc_dev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 143 rc_dev->driver_name = "SMI_PCIe"; 144 rc_dev->input_phys = ir->input_phys; 145 rc_dev->device_name = ir->device_name; 146 rc_dev->input_id.bustype = BUS_PCI; 147 rc_dev->input_id.version = 1; 148 rc_dev->input_id.vendor = dev->pci_dev->subsystem_vendor; 149 rc_dev->input_id.product = dev->pci_dev->subsystem_device; 150 rc_dev->dev.parent = &dev->pci_dev->dev; 151 152 rc_dev->map_name = dev->info->rc_map; 153 rc_dev->timeout = MS_TO_US(100); 154 rc_dev->rx_resolution = SMI_SAMPLE_PERIOD; 155 156 ir->rc_dev = rc_dev; 157 ir->dev = dev; 158 159 smi_ir_disableInterrupt(ir); 160 161 ret = rc_register_device(rc_dev); 162 if (ret) 163 goto ir_err; 164 165 return 0; 166 ir_err: 167 rc_free_device(rc_dev); 168 return ret; 169 } 170 171 void smi_ir_exit(struct smi_dev *dev) 172 { 173 struct smi_rc *ir = &dev->ir; 174 struct rc_dev *rc_dev = ir->rc_dev; 175 176 smi_ir_stop(ir); 177 rc_unregister_device(rc_dev); 178 ir->rc_dev = NULL; 179 } 180