1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Apple Motion Sensor driver (PMU variant) |
4 | * |
5 | * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch) |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/types.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/init.h> |
12 | #include <linux/adb.h> |
13 | #include <linux/pmu.h> |
14 | |
15 | #include "ams.h" |
16 | |
17 | /* Attitude */ |
18 | #define AMS_X 0x00 |
19 | #define AMS_Y 0x01 |
20 | #define AMS_Z 0x02 |
21 | |
22 | /* Not exactly known, maybe chip vendor */ |
23 | #define AMS_VENDOR 0x03 |
24 | |
25 | /* Freefall registers */ |
26 | #define AMS_FF_CLEAR 0x04 |
27 | #define AMS_FF_ENABLE 0x05 |
28 | #define AMS_FF_LOW_LIMIT 0x06 |
29 | #define AMS_FF_DEBOUNCE 0x07 |
30 | |
31 | /* Shock registers */ |
32 | #define AMS_SHOCK_CLEAR 0x08 |
33 | #define AMS_SHOCK_ENABLE 0x09 |
34 | #define AMS_SHOCK_HIGH_LIMIT 0x0a |
35 | #define AMS_SHOCK_DEBOUNCE 0x0b |
36 | |
37 | /* Global interrupt and power control register */ |
38 | #define AMS_CONTROL 0x0c |
39 | |
40 | static u8 ams_pmu_cmd; |
41 | |
42 | static void ams_pmu_req_complete(struct adb_request *req) |
43 | { |
44 | complete((struct completion *)req->arg); |
45 | } |
46 | |
47 | /* Only call this function from task context */ |
48 | static void ams_pmu_set_register(u8 reg, u8 value) |
49 | { |
50 | static struct adb_request req; |
51 | DECLARE_COMPLETION(req_complete); |
52 | |
53 | req.arg = &req_complete; |
54 | if (pmu_request(req: &req, done: ams_pmu_req_complete, nbytes: 4, ams_pmu_cmd, 0x00, reg, value)) |
55 | return; |
56 | |
57 | wait_for_completion(&req_complete); |
58 | } |
59 | |
60 | /* Only call this function from task context */ |
61 | static u8 ams_pmu_get_register(u8 reg) |
62 | { |
63 | static struct adb_request req; |
64 | DECLARE_COMPLETION(req_complete); |
65 | |
66 | req.arg = &req_complete; |
67 | if (pmu_request(req: &req, done: ams_pmu_req_complete, nbytes: 3, ams_pmu_cmd, 0x01, reg)) |
68 | return 0; |
69 | |
70 | wait_for_completion(&req_complete); |
71 | |
72 | if (req.reply_len > 0) |
73 | return req.reply[0]; |
74 | else |
75 | return 0; |
76 | } |
77 | |
78 | /* Enables or disables the specified interrupts */ |
79 | static void ams_pmu_set_irq(enum ams_irq reg, char enable) |
80 | { |
81 | if (reg & AMS_IRQ_FREEFALL) { |
82 | u8 val = ams_pmu_get_register(AMS_FF_ENABLE); |
83 | if (enable) |
84 | val |= 0x80; |
85 | else |
86 | val &= ~0x80; |
87 | ams_pmu_set_register(AMS_FF_ENABLE, value: val); |
88 | } |
89 | |
90 | if (reg & AMS_IRQ_SHOCK) { |
91 | u8 val = ams_pmu_get_register(AMS_SHOCK_ENABLE); |
92 | if (enable) |
93 | val |= 0x80; |
94 | else |
95 | val &= ~0x80; |
96 | ams_pmu_set_register(AMS_SHOCK_ENABLE, value: val); |
97 | } |
98 | |
99 | if (reg & AMS_IRQ_GLOBAL) { |
100 | u8 val = ams_pmu_get_register(AMS_CONTROL); |
101 | if (enable) |
102 | val |= 0x80; |
103 | else |
104 | val &= ~0x80; |
105 | ams_pmu_set_register(AMS_CONTROL, value: val); |
106 | } |
107 | } |
108 | |
109 | static void ams_pmu_clear_irq(enum ams_irq reg) |
110 | { |
111 | if (reg & AMS_IRQ_FREEFALL) |
112 | ams_pmu_set_register(AMS_FF_CLEAR, value: 0x00); |
113 | |
114 | if (reg & AMS_IRQ_SHOCK) |
115 | ams_pmu_set_register(AMS_SHOCK_CLEAR, value: 0x00); |
116 | } |
117 | |
118 | static u8 ams_pmu_get_vendor(void) |
119 | { |
120 | return ams_pmu_get_register(AMS_VENDOR); |
121 | } |
122 | |
123 | static void ams_pmu_get_xyz(s8 *x, s8 *y, s8 *z) |
124 | { |
125 | *x = ams_pmu_get_register(AMS_X); |
126 | *y = ams_pmu_get_register(AMS_Y); |
127 | *z = ams_pmu_get_register(AMS_Z); |
128 | } |
129 | |
130 | static void ams_pmu_exit(void) |
131 | { |
132 | ams_sensor_detach(); |
133 | |
134 | /* Disable interrupts */ |
135 | ams_pmu_set_irq(reg: AMS_IRQ_ALL, enable: 0); |
136 | |
137 | /* Clear interrupts */ |
138 | ams_pmu_clear_irq(reg: AMS_IRQ_ALL); |
139 | |
140 | ams_info.has_device = 0; |
141 | |
142 | printk(KERN_INFO "ams: Unloading\n" ); |
143 | } |
144 | |
145 | int __init ams_pmu_init(struct device_node *np) |
146 | { |
147 | const u32 *prop; |
148 | int result; |
149 | |
150 | /* Set implementation stuff */ |
151 | ams_info.of_node = np; |
152 | ams_info.exit = ams_pmu_exit; |
153 | ams_info.get_vendor = ams_pmu_get_vendor; |
154 | ams_info.get_xyz = ams_pmu_get_xyz; |
155 | ams_info.clear_irq = ams_pmu_clear_irq; |
156 | ams_info.bustype = BUS_HOST; |
157 | |
158 | /* Get PMU command, should be 0x4e, but we can never know */ |
159 | prop = of_get_property(node: ams_info.of_node, name: "reg" , NULL); |
160 | if (!prop) |
161 | return -ENODEV; |
162 | |
163 | ams_pmu_cmd = ((*prop) >> 8) & 0xff; |
164 | |
165 | /* Disable interrupts */ |
166 | ams_pmu_set_irq(reg: AMS_IRQ_ALL, enable: 0); |
167 | |
168 | /* Clear interrupts */ |
169 | ams_pmu_clear_irq(reg: AMS_IRQ_ALL); |
170 | |
171 | result = ams_sensor_attach(); |
172 | if (result < 0) |
173 | return result; |
174 | |
175 | /* Set default values */ |
176 | ams_pmu_set_register(AMS_FF_LOW_LIMIT, value: 0x15); |
177 | ams_pmu_set_register(AMS_FF_ENABLE, value: 0x08); |
178 | ams_pmu_set_register(AMS_FF_DEBOUNCE, value: 0x14); |
179 | |
180 | ams_pmu_set_register(AMS_SHOCK_HIGH_LIMIT, value: 0x60); |
181 | ams_pmu_set_register(AMS_SHOCK_ENABLE, value: 0x0f); |
182 | ams_pmu_set_register(AMS_SHOCK_DEBOUNCE, value: 0x14); |
183 | |
184 | ams_pmu_set_register(AMS_CONTROL, value: 0x4f); |
185 | |
186 | /* Clear interrupts */ |
187 | ams_pmu_clear_irq(reg: AMS_IRQ_ALL); |
188 | |
189 | ams_info.has_device = 1; |
190 | |
191 | /* Enable interrupts */ |
192 | ams_pmu_set_irq(reg: AMS_IRQ_ALL, enable: 1); |
193 | |
194 | printk(KERN_INFO "ams: Found PMU based motion sensor\n" ); |
195 | |
196 | return 0; |
197 | } |
198 | |