2006-12-12 10:18:30 -07:00
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/*
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* Apple Motion Sensor driver (PMU variant)
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*
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* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#include "ams.h"
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/* Attitude */
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#define AMS_X 0x00
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#define AMS_Y 0x01
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#define AMS_Z 0x02
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/* Not exactly known, maybe chip vendor */
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#define AMS_VENDOR 0x03
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/* Freefall registers */
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#define AMS_FF_CLEAR 0x04
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#define AMS_FF_ENABLE 0x05
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#define AMS_FF_LOW_LIMIT 0x06
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#define AMS_FF_DEBOUNCE 0x07
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/* Shock registers */
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#define AMS_SHOCK_CLEAR 0x08
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#define AMS_SHOCK_ENABLE 0x09
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#define AMS_SHOCK_HIGH_LIMIT 0x0a
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#define AMS_SHOCK_DEBOUNCE 0x0b
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/* Global interrupt and power control register */
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#define AMS_CONTROL 0x0c
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static u8 ams_pmu_cmd;
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static void ams_pmu_req_complete(struct adb_request *req)
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{
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complete((struct completion *)req->arg);
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}
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/* Only call this function from task context */
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static void ams_pmu_set_register(u8 reg, u8 value)
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{
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static struct adb_request req;
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DECLARE_COMPLETION(req_complete);
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req.arg = &req_complete;
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if (pmu_request(&req, ams_pmu_req_complete, 4, ams_pmu_cmd, 0x00, reg, value))
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return;
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wait_for_completion(&req_complete);
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}
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/* Only call this function from task context */
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static u8 ams_pmu_get_register(u8 reg)
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{
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static struct adb_request req;
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DECLARE_COMPLETION(req_complete);
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req.arg = &req_complete;
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if (pmu_request(&req, ams_pmu_req_complete, 3, ams_pmu_cmd, 0x01, reg))
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return 0;
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wait_for_completion(&req_complete);
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if (req.reply_len > 0)
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return req.reply[0];
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else
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return 0;
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}
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/* Enables or disables the specified interrupts */
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static void ams_pmu_set_irq(enum ams_irq reg, char enable)
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{
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if (reg & AMS_IRQ_FREEFALL) {
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u8 val = ams_pmu_get_register(AMS_FF_ENABLE);
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if (enable)
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val |= 0x80;
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else
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val &= ~0x80;
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ams_pmu_set_register(AMS_FF_ENABLE, val);
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}
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if (reg & AMS_IRQ_SHOCK) {
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u8 val = ams_pmu_get_register(AMS_SHOCK_ENABLE);
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if (enable)
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val |= 0x80;
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else
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val &= ~0x80;
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ams_pmu_set_register(AMS_SHOCK_ENABLE, val);
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}
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if (reg & AMS_IRQ_GLOBAL) {
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u8 val = ams_pmu_get_register(AMS_CONTROL);
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if (enable)
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val |= 0x80;
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else
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val &= ~0x80;
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ams_pmu_set_register(AMS_CONTROL, val);
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}
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}
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static void ams_pmu_clear_irq(enum ams_irq reg)
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{
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if (reg & AMS_IRQ_FREEFALL)
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ams_pmu_set_register(AMS_FF_CLEAR, 0x00);
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if (reg & AMS_IRQ_SHOCK)
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ams_pmu_set_register(AMS_SHOCK_CLEAR, 0x00);
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}
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static u8 ams_pmu_get_vendor(void)
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{
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return ams_pmu_get_register(AMS_VENDOR);
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}
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static void ams_pmu_get_xyz(s8 *x, s8 *y, s8 *z)
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{
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*x = ams_pmu_get_register(AMS_X);
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*y = ams_pmu_get_register(AMS_Y);
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*z = ams_pmu_get_register(AMS_Z);
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}
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static void ams_pmu_exit(void)
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{
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/* Disable interrupts */
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ams_pmu_set_irq(AMS_IRQ_ALL, 0);
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/* Clear interrupts */
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ams_pmu_clear_irq(AMS_IRQ_ALL);
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ams_info.has_device = 0;
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printk(KERN_INFO "ams: Unloading\n");
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}
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int __init ams_pmu_init(struct device_node *np)
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{
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2007-04-02 18:52:17 -06:00
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const u32 *prop;
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2006-12-12 10:18:30 -07:00
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int result;
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mutex_lock(&ams_info.lock);
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/* Set implementation stuff */
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ams_info.of_node = np;
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ams_info.exit = ams_pmu_exit;
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ams_info.get_vendor = ams_pmu_get_vendor;
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ams_info.get_xyz = ams_pmu_get_xyz;
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ams_info.clear_irq = ams_pmu_clear_irq;
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ams_info.bustype = BUS_HOST;
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/* Get PMU command, should be 0x4e, but we can never know */
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2007-04-03 06:40:39 -06:00
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prop = of_get_property(ams_info.of_node, "reg", NULL);
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2006-12-12 10:18:30 -07:00
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if (!prop) {
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result = -ENODEV;
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goto exit;
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}
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ams_pmu_cmd = ((*prop) >> 8) & 0xff;
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/* Disable interrupts */
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ams_pmu_set_irq(AMS_IRQ_ALL, 0);
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/* Clear interrupts */
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ams_pmu_clear_irq(AMS_IRQ_ALL);
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result = ams_sensor_attach();
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if (result < 0)
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goto exit;
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/* Set default values */
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ams_pmu_set_register(AMS_FF_LOW_LIMIT, 0x15);
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ams_pmu_set_register(AMS_FF_ENABLE, 0x08);
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ams_pmu_set_register(AMS_FF_DEBOUNCE, 0x14);
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ams_pmu_set_register(AMS_SHOCK_HIGH_LIMIT, 0x60);
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ams_pmu_set_register(AMS_SHOCK_ENABLE, 0x0f);
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ams_pmu_set_register(AMS_SHOCK_DEBOUNCE, 0x14);
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ams_pmu_set_register(AMS_CONTROL, 0x4f);
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/* Clear interrupts */
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ams_pmu_clear_irq(AMS_IRQ_ALL);
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ams_info.has_device = 1;
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/* Enable interrupts */
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ams_pmu_set_irq(AMS_IRQ_ALL, 1);
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printk(KERN_INFO "ams: Found PMU based motion sensor\n");
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result = 0;
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exit:
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mutex_unlock(&ams_info.lock);
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return result;
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}
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