/* * 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; }