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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | /* * Apple Motion Sensor driver (PMU variant) * * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/adb.h> #include <linux/pmu.h> #include "ams.h" /* Attitude */ #define AMS_X 0x00 #define AMS_Y 0x01 #define AMS_Z 0x02 /* Not exactly known, maybe chip vendor */ #define AMS_VENDOR 0x03 /* Freefall registers */ #define AMS_FF_CLEAR 0x04 #define AMS_FF_ENABLE 0x05 #define AMS_FF_LOW_LIMIT 0x06 #define AMS_FF_DEBOUNCE 0x07 /* Shock registers */ #define AMS_SHOCK_CLEAR 0x08 #define AMS_SHOCK_ENABLE 0x09 #define AMS_SHOCK_HIGH_LIMIT 0x0a #define AMS_SHOCK_DEBOUNCE 0x0b /* Global interrupt and power control register */ #define AMS_CONTROL 0x0c static u8 ams_pmu_cmd; static void ams_pmu_req_complete(struct adb_request *req) { complete((struct completion *)req->arg); } /* Only call this function from task context */ static void ams_pmu_set_register(u8 reg, u8 value) { static struct adb_request req; DECLARE_COMPLETION(req_complete); req.arg = &req_complete; if (pmu_request(&req, ams_pmu_req_complete, 4, ams_pmu_cmd, 0x00, reg, value)) return; wait_for_completion(&req_complete); } /* Only call this function from task context */ static u8 ams_pmu_get_register(u8 reg) { static struct adb_request req; DECLARE_COMPLETION(req_complete); req.arg = &req_complete; if (pmu_request(&req, ams_pmu_req_complete, 3, ams_pmu_cmd, 0x01, reg)) return 0; wait_for_completion(&req_complete); if (req.reply_len > 0) return req.reply[0]; else return 0; } /* Enables or disables the specified interrupts */ static void ams_pmu_set_irq(enum ams_irq reg, char enable) { if (reg & AMS_IRQ_FREEFALL) { u8 val = ams_pmu_get_register(AMS_FF_ENABLE); if (enable) val |= 0x80; else val &= ~0x80; ams_pmu_set_register(AMS_FF_ENABLE, val); } if (reg & AMS_IRQ_SHOCK) { u8 val = ams_pmu_get_register(AMS_SHOCK_ENABLE); if (enable) val |= 0x80; else val &= ~0x80; ams_pmu_set_register(AMS_SHOCK_ENABLE, val); } if (reg & AMS_IRQ_GLOBAL) { u8 val = ams_pmu_get_register(AMS_CONTROL); if (enable) val |= 0x80; else val &= ~0x80; ams_pmu_set_register(AMS_CONTROL, val); } } static void ams_pmu_clear_irq(enum ams_irq reg) { if (reg & AMS_IRQ_FREEFALL) ams_pmu_set_register(AMS_FF_CLEAR, 0x00); if (reg & AMS_IRQ_SHOCK) ams_pmu_set_register(AMS_SHOCK_CLEAR, 0x00); } static u8 ams_pmu_get_vendor(void) { return ams_pmu_get_register(AMS_VENDOR); } static void ams_pmu_get_xyz(s8 *x, s8 *y, s8 *z) { *x = ams_pmu_get_register(AMS_X); *y = ams_pmu_get_register(AMS_Y); *z = ams_pmu_get_register(AMS_Z); } static void ams_pmu_exit(void) { ams_sensor_detach(); /* Disable interrupts */ ams_pmu_set_irq(AMS_IRQ_ALL, 0); /* Clear interrupts */ ams_pmu_clear_irq(AMS_IRQ_ALL); ams_info.has_device = 0; printk(KERN_INFO "ams: Unloading\n"); } int __init ams_pmu_init(struct device_node *np) { const u32 *prop; int result; /* Set implementation stuff */ ams_info.of_node = np; ams_info.exit = ams_pmu_exit; ams_info.get_vendor = ams_pmu_get_vendor; ams_info.get_xyz = ams_pmu_get_xyz; ams_info.clear_irq = ams_pmu_clear_irq; ams_info.bustype = BUS_HOST; /* Get PMU command, should be 0x4e, but we can never know */ prop = of_get_property(ams_info.of_node, "reg", NULL); if (!prop) return -ENODEV; ams_pmu_cmd = ((*prop) >> 8) & 0xff; /* Disable interrupts */ ams_pmu_set_irq(AMS_IRQ_ALL, 0); /* Clear interrupts */ ams_pmu_clear_irq(AMS_IRQ_ALL); result = ams_sensor_attach(); if (result < 0) return result; /* Set default values */ ams_pmu_set_register(AMS_FF_LOW_LIMIT, 0x15); ams_pmu_set_register(AMS_FF_ENABLE, 0x08); ams_pmu_set_register(AMS_FF_DEBOUNCE, 0x14); ams_pmu_set_register(AMS_SHOCK_HIGH_LIMIT, 0x60); ams_pmu_set_register(AMS_SHOCK_ENABLE, 0x0f); ams_pmu_set_register(AMS_SHOCK_DEBOUNCE, 0x14); ams_pmu_set_register(AMS_CONTROL, 0x4f); /* Clear interrupts */ ams_pmu_clear_irq(AMS_IRQ_ALL); ams_info.has_device = 1; /* Enable interrupts */ ams_pmu_set_irq(AMS_IRQ_ALL, 1); printk(KERN_INFO "ams: Found PMU based motion sensor\n"); return 0; } |