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
smi_ir_enableInterrupt(struct smi_rc * ir)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
smi_ir_disableInterrupt(struct smi_rc * ir)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
smi_ir_clearInterrupt(struct smi_rc * ir)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
smi_ir_stop(struct smi_rc * ir)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
smi_raw_process(struct rc_dev * rc_dev,const u8 * buffer,const u8 length)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
smi_ir_decode(struct smi_rc * ir)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 control, data;
64 u8 index, ir_count, read_loop;
65
66 control = smi_read(IR_Init_Reg);
67
68 dev_dbg(&rc_dev->dev, "ircontrol: 0x%08x\n", control);
69
70 if (control & rbIRVld) {
71 ir_count = (u8)smi_read(IR_Data_Cnt);
72
73 dev_dbg(&rc_dev->dev, "ircount %d\n", ir_count);
74
75 read_loop = ir_count / 4;
76 if (ir_count % 4)
77 read_loop += 1;
78 for (index = 0; index < read_loop; index++) {
79 data = smi_read(IR_DATA_BUFFER_BASE + (index * 4));
80 dev_dbg(&rc_dev->dev, "IRData 0x%08x\n", data);
81
82 ir->irData[index * 4 + 0] = (u8)(data);
83 ir->irData[index * 4 + 1] = (u8)(data >> 8);
84 ir->irData[index * 4 + 2] = (u8)(data >> 16);
85 ir->irData[index * 4 + 3] = (u8)(data >> 24);
86 }
87 smi_raw_process(rc_dev, ir->irData, ir_count);
88 }
89
90 if (control & rbIRhighidle) {
91 struct ir_raw_event rawir = {};
92
93 dev_dbg(&rc_dev->dev, "high idle\n");
94
95 rawir.pulse = 0;
96 rawir.duration = SMI_SAMPLE_PERIOD * SMI_SAMPLE_IDLEMIN;
97 ir_raw_event_store_with_filter(rc_dev, &rawir);
98 }
99
100 smi_set(IR_Init_Reg, rbIRVld);
101 ir_raw_event_handle(rc_dev);
102 }
103
104 /* ir functions call by main driver.*/
smi_ir_irq(struct smi_rc * ir,u32 int_status)105 int smi_ir_irq(struct smi_rc *ir, u32 int_status)
106 {
107 int handled = 0;
108
109 if (int_status & IR_X_INT) {
110 smi_ir_disableInterrupt(ir);
111 smi_ir_clearInterrupt(ir);
112 smi_ir_decode(ir);
113 smi_ir_enableInterrupt(ir);
114 handled = 1;
115 }
116 return handled;
117 }
118
smi_ir_start(struct smi_rc * ir)119 void smi_ir_start(struct smi_rc *ir)
120 {
121 struct smi_dev *dev = ir->dev;
122
123 smi_write(IR_Idle_Cnt_Low,
124 (((SMI_SAMPLE_PERIOD - 1) & 0xFFFF) << 16) |
125 (SMI_SAMPLE_IDLEMIN & 0xFFFF));
126 msleep(20);
127 smi_set(IR_Init_Reg, rbIRen | rbIRhighidle);
128
129 smi_ir_enableInterrupt(ir);
130 }
131
smi_ir_init(struct smi_dev * dev)132 int smi_ir_init(struct smi_dev *dev)
133 {
134 int ret;
135 struct rc_dev *rc_dev;
136 struct smi_rc *ir = &dev->ir;
137
138 rc_dev = rc_allocate_device(RC_DRIVER_IR_RAW);
139 if (!rc_dev)
140 return -ENOMEM;
141
142 /* init input device */
143 snprintf(ir->device_name, sizeof(ir->device_name), "IR (%s)",
144 dev->info->name);
145 snprintf(ir->input_phys, sizeof(ir->input_phys), "pci-%s/ir0",
146 pci_name(dev->pci_dev));
147
148 rc_dev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
149 rc_dev->driver_name = "SMI_PCIe";
150 rc_dev->input_phys = ir->input_phys;
151 rc_dev->device_name = ir->device_name;
152 rc_dev->input_id.bustype = BUS_PCI;
153 rc_dev->input_id.version = 1;
154 rc_dev->input_id.vendor = dev->pci_dev->subsystem_vendor;
155 rc_dev->input_id.product = dev->pci_dev->subsystem_device;
156 rc_dev->dev.parent = &dev->pci_dev->dev;
157
158 rc_dev->map_name = dev->info->rc_map;
159 rc_dev->timeout = SMI_SAMPLE_PERIOD * SMI_SAMPLE_IDLEMIN;
160 rc_dev->rx_resolution = SMI_SAMPLE_PERIOD;
161
162 ir->rc_dev = rc_dev;
163 ir->dev = dev;
164
165 smi_ir_disableInterrupt(ir);
166
167 ret = rc_register_device(rc_dev);
168 if (ret)
169 goto ir_err;
170
171 return 0;
172 ir_err:
173 rc_free_device(rc_dev);
174 return ret;
175 }
176
smi_ir_exit(struct smi_dev * dev)177 void smi_ir_exit(struct smi_dev *dev)
178 {
179 struct smi_rc *ir = &dev->ir;
180 struct rc_dev *rc_dev = ir->rc_dev;
181
182 rc_unregister_device(rc_dev);
183 smi_ir_stop(ir);
184 ir->rc_dev = NULL;
185 }
186