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1 | /* |
2 | * Copyright (C) 2015-2016 Red Hat | |
3 | * Copyright (C) 2015 Lyude Paul <thatslyude@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/serio.h> | |
13 | #include <linux/notifier.h> | |
14 | #include "rmi_driver.h" | |
15 | ||
16 | #define RMI_F03_RX_DATA_OFB 0x01 | |
17 | #define RMI_F03_OB_SIZE 2 | |
18 | ||
19 | #define RMI_F03_OB_OFFSET 2 | |
20 | #define RMI_F03_OB_DATA_OFFSET 1 | |
21 | #define RMI_F03_OB_FLAG_TIMEOUT BIT(6) | |
22 | #define RMI_F03_OB_FLAG_PARITY BIT(7) | |
23 | ||
24 | #define RMI_F03_DEVICE_COUNT 0x07 | |
25 | #define RMI_F03_BYTES_PER_DEVICE 0x07 | |
26 | #define RMI_F03_BYTES_PER_DEVICE_SHIFT 4 | |
27 | #define RMI_F03_QUEUE_LENGTH 0x0F | |
28 | ||
29 | struct f03_data { | |
30 | struct rmi_function *fn; | |
31 | ||
32 | struct serio *serio; | |
33 | ||
34 | u8 device_count; | |
35 | u8 rx_queue_length; | |
36 | }; | |
37 | ||
38 | static int rmi_f03_pt_write(struct serio *id, unsigned char val) | |
39 | { | |
40 | struct f03_data *f03 = id->port_data; | |
41 | int error; | |
42 | ||
43 | rmi_dbg(RMI_DEBUG_FN, &f03->fn->dev, | |
44 | "%s: Wrote %.2hhx to PS/2 passthrough address", | |
45 | __func__, val); | |
46 | ||
47 | error = rmi_write(f03->fn->rmi_dev, f03->fn->fd.data_base_addr, val); | |
48 | if (error) { | |
49 | dev_err(&f03->fn->dev, | |
50 | "%s: Failed to write to F03 TX register (%d).\n", | |
51 | __func__, error); | |
52 | return error; | |
53 | } | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int rmi_f03_initialize(struct f03_data *f03) | |
59 | { | |
60 | struct rmi_function *fn = f03->fn; | |
61 | struct device *dev = &fn->dev; | |
62 | int error; | |
63 | u8 bytes_per_device; | |
64 | u8 query1; | |
65 | u8 query2[RMI_F03_DEVICE_COUNT * RMI_F03_BYTES_PER_DEVICE]; | |
66 | size_t query2_len; | |
67 | ||
68 | error = rmi_read(fn->rmi_dev, fn->fd.query_base_addr, &query1); | |
69 | if (error) { | |
70 | dev_err(dev, "Failed to read query register (%d).\n", error); | |
71 | return error; | |
72 | } | |
73 | ||
74 | f03->device_count = query1 & RMI_F03_DEVICE_COUNT; | |
75 | bytes_per_device = (query1 >> RMI_F03_BYTES_PER_DEVICE_SHIFT) & | |
76 | RMI_F03_BYTES_PER_DEVICE; | |
77 | ||
78 | query2_len = f03->device_count * bytes_per_device; | |
79 | ||
80 | /* | |
81 | * The first generation of image sensors don't have a second part to | |
82 | * their f03 query, as such we have to set some of these values manually | |
83 | */ | |
84 | if (query2_len < 1) { | |
85 | f03->device_count = 1; | |
86 | f03->rx_queue_length = 7; | |
87 | } else { | |
88 | error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr + 1, | |
89 | query2, query2_len); | |
90 | if (error) { | |
91 | dev_err(dev, | |
92 | "Failed to read second set of query registers (%d).\n", | |
93 | error); | |
94 | return error; | |
95 | } | |
96 | ||
97 | f03->rx_queue_length = query2[0] & RMI_F03_QUEUE_LENGTH; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int rmi_f03_register_pt(struct f03_data *f03) | |
104 | { | |
105 | struct serio *serio; | |
106 | ||
107 | serio = kzalloc(sizeof(struct serio), GFP_KERNEL); | |
108 | if (!serio) | |
109 | return -ENOMEM; | |
110 | ||
111 | serio->id.type = SERIO_8042; | |
112 | serio->write = rmi_f03_pt_write; | |
113 | serio->port_data = f03; | |
114 | ||
115 | strlcpy(serio->name, "Synaptics RMI4 PS/2 pass-through", | |
116 | sizeof(serio->name)); | |
117 | strlcpy(serio->phys, "synaptics-rmi4-pt/serio1", | |
118 | sizeof(serio->phys)); | |
119 | serio->dev.parent = &f03->fn->dev; | |
120 | ||
121 | f03->serio = serio; | |
122 | ||
123 | serio_register_port(serio); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static int rmi_f03_probe(struct rmi_function *fn) | |
129 | { | |
130 | struct device *dev = &fn->dev; | |
131 | struct f03_data *f03; | |
132 | int error; | |
133 | ||
134 | f03 = devm_kzalloc(dev, sizeof(struct f03_data), GFP_KERNEL); | |
135 | if (!f03) | |
136 | return -ENOMEM; | |
137 | ||
138 | f03->fn = fn; | |
139 | ||
140 | error = rmi_f03_initialize(f03); | |
141 | if (error < 0) | |
142 | return error; | |
143 | ||
144 | if (f03->device_count != 1) | |
145 | dev_warn(dev, "found %d devices on PS/2 passthrough", | |
146 | f03->device_count); | |
147 | ||
148 | dev_set_drvdata(dev, f03); | |
149 | ||
150 | error = rmi_f03_register_pt(f03); | |
151 | if (error) | |
152 | return error; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int rmi_f03_config(struct rmi_function *fn) | |
158 | { | |
159 | fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits) | |
165 | { | |
166 | struct f03_data *f03 = dev_get_drvdata(&fn->dev); | |
167 | u16 data_addr = fn->fd.data_base_addr; | |
168 | const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE; | |
169 | u8 obs[RMI_F03_QUEUE_LENGTH * RMI_F03_OB_SIZE]; | |
170 | u8 ob_status; | |
171 | u8 ob_data; | |
172 | unsigned int serio_flags; | |
173 | int i; | |
174 | int error; | |
175 | ||
176 | /* Grab all of the data registers, and check them for data */ | |
177 | error = rmi_read_block(fn->rmi_dev, data_addr + RMI_F03_OB_OFFSET, | |
178 | &obs, ob_len); | |
179 | if (error) { | |
180 | dev_err(&fn->dev, | |
181 | "%s: Failed to read F03 output buffers: %d\n", | |
182 | __func__, error); | |
183 | serio_interrupt(f03->serio, 0, SERIO_TIMEOUT); | |
184 | return error; | |
185 | } | |
186 | ||
187 | for (i = 0; i < ob_len; i += RMI_F03_OB_SIZE) { | |
188 | ob_status = obs[i]; | |
189 | ob_data = obs[i + RMI_F03_OB_DATA_OFFSET]; | |
190 | serio_flags = 0; | |
191 | ||
192 | if (!(ob_status & RMI_F03_RX_DATA_OFB)) | |
193 | continue; | |
194 | ||
195 | if (ob_status & RMI_F03_OB_FLAG_TIMEOUT) | |
196 | serio_flags |= SERIO_TIMEOUT; | |
197 | if (ob_status & RMI_F03_OB_FLAG_PARITY) | |
198 | serio_flags |= SERIO_PARITY; | |
199 | ||
200 | rmi_dbg(RMI_DEBUG_FN, &fn->dev, | |
201 | "%s: Received %.2hhx from PS2 guest T: %c P: %c\n", | |
202 | __func__, ob_data, | |
203 | serio_flags & SERIO_TIMEOUT ? 'Y' : 'N', | |
204 | serio_flags & SERIO_PARITY ? 'Y' : 'N'); | |
205 | ||
206 | serio_interrupt(f03->serio, ob_data, serio_flags); | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static void rmi_f03_remove(struct rmi_function *fn) | |
213 | { | |
214 | struct f03_data *f03 = dev_get_drvdata(&fn->dev); | |
215 | ||
216 | serio_unregister_port(f03->serio); | |
217 | } | |
218 | ||
219 | struct rmi_function_handler rmi_f03_handler = { | |
220 | .driver = { | |
221 | .name = "rmi4_f03", | |
222 | }, | |
223 | .func = 0x03, | |
224 | .probe = rmi_f03_probe, | |
225 | .config = rmi_f03_config, | |
226 | .attention = rmi_f03_attention, | |
227 | .remove = rmi_f03_remove, | |
228 | }; | |
229 | ||
230 | MODULE_AUTHOR("Lyude Paul <thatslyude@gmail.com>"); | |
231 | MODULE_DESCRIPTION("RMI F03 module"); | |
232 | MODULE_LICENSE("GPL"); |