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
13static 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
20static 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
27static 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
34static 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
42static 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
59static 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.*/
105int 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
119void 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
132int 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;
172ir_err:
173	rc_free_device(rc_dev);
174	return ret;
175}
176
177void 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