1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * ideapad-laptop.h - Lenovo IdeaPad ACPI Extras
4 *
5 * Copyright © 2010 Intel Corporation
6 * Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
7 */
8
9 #ifndef _IDEAPAD_LAPTOP_H_
10 #define _IDEAPAD_LAPTOP_H_
11
12 #include <linux/acpi.h>
13 #include <linux/jiffies.h>
14 #include <linux/errno.h>
15
16 enum {
17 VPCCMD_R_VPC1 = 0x10,
18 VPCCMD_R_BL_MAX,
19 VPCCMD_R_BL,
20 VPCCMD_W_BL,
21 VPCCMD_R_WIFI,
22 VPCCMD_W_WIFI,
23 VPCCMD_R_BT,
24 VPCCMD_W_BT,
25 VPCCMD_R_BL_POWER,
26 VPCCMD_R_NOVO,
27 VPCCMD_R_VPC2,
28 VPCCMD_R_TOUCHPAD,
29 VPCCMD_W_TOUCHPAD,
30 VPCCMD_R_CAMERA,
31 VPCCMD_W_CAMERA,
32 VPCCMD_R_3G,
33 VPCCMD_W_3G,
34 VPCCMD_R_ODD, /* 0x21 */
35 VPCCMD_W_FAN,
36 VPCCMD_R_RF,
37 VPCCMD_W_RF,
38 VPCCMD_W_YMC = 0x2A,
39 VPCCMD_R_FAN = 0x2B,
40 VPCCMD_R_SPECIAL_BUTTONS = 0x31,
41 VPCCMD_W_BL_POWER = 0x33,
42 };
43
eval_int_with_arg(acpi_handle handle,const char * name,unsigned long arg,unsigned long * res)44 static inline int eval_int_with_arg(acpi_handle handle, const char *name, unsigned long arg, unsigned long *res)
45 {
46 struct acpi_object_list params;
47 unsigned long long result;
48 union acpi_object in_obj;
49 acpi_status status;
50
51 params.count = 1;
52 params.pointer = &in_obj;
53 in_obj.type = ACPI_TYPE_INTEGER;
54 in_obj.integer.value = arg;
55
56 status = acpi_evaluate_integer(handle, (char *)name, ¶ms, &result);
57 if (ACPI_FAILURE(status))
58 return -EIO;
59
60 if (res)
61 *res = result;
62
63 return 0;
64 }
65
eval_vpcr(acpi_handle handle,unsigned long cmd,unsigned long * res)66 static inline int eval_vpcr(acpi_handle handle, unsigned long cmd, unsigned long *res)
67 {
68 return eval_int_with_arg(handle, "VPCR", cmd, res);
69 }
70
eval_vpcw(acpi_handle handle,unsigned long cmd,unsigned long data)71 static inline int eval_vpcw(acpi_handle handle, unsigned long cmd, unsigned long data)
72 {
73 struct acpi_object_list params;
74 union acpi_object in_obj[2];
75 acpi_status status;
76
77 params.count = 2;
78 params.pointer = in_obj;
79 in_obj[0].type = ACPI_TYPE_INTEGER;
80 in_obj[0].integer.value = cmd;
81 in_obj[1].type = ACPI_TYPE_INTEGER;
82 in_obj[1].integer.value = data;
83
84 status = acpi_evaluate_object(handle, "VPCW", ¶ms, NULL);
85 if (ACPI_FAILURE(status))
86 return -EIO;
87
88 return 0;
89 }
90
91 #define IDEAPAD_EC_TIMEOUT 200 /* in ms */
92
read_ec_data(acpi_handle handle,unsigned long cmd,unsigned long * data)93 static inline int read_ec_data(acpi_handle handle, unsigned long cmd, unsigned long *data)
94 {
95 unsigned long end_jiffies, val;
96 int err;
97
98 err = eval_vpcw(handle, 1, cmd);
99 if (err)
100 return err;
101
102 end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
103
104 while (time_before(jiffies, end_jiffies)) {
105 schedule();
106
107 err = eval_vpcr(handle, 1, &val);
108 if (err)
109 return err;
110
111 if (val == 0)
112 return eval_vpcr(handle, 0, data);
113 }
114
115 acpi_handle_err(handle, "timeout in %s\n", __func__);
116
117 return -ETIMEDOUT;
118 }
119
write_ec_cmd(acpi_handle handle,unsigned long cmd,unsigned long data)120 static inline int write_ec_cmd(acpi_handle handle, unsigned long cmd, unsigned long data)
121 {
122 unsigned long end_jiffies, val;
123 int err;
124
125 err = eval_vpcw(handle, 0, data);
126 if (err)
127 return err;
128
129 err = eval_vpcw(handle, 1, cmd);
130 if (err)
131 return err;
132
133 end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
134
135 while (time_before(jiffies, end_jiffies)) {
136 schedule();
137
138 err = eval_vpcr(handle, 1, &val);
139 if (err)
140 return err;
141
142 if (val == 0)
143 return 0;
144 }
145
146 acpi_handle_err(handle, "timeout in %s\n", __func__);
147
148 return -ETIMEDOUT;
149 }
150
151 #undef IDEAPAD_EC_TIMEOUT
152 #endif /* !_IDEAPAD_LAPTOP_H_ */
153