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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
197 lines
4.2 KiB
C
197 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#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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ams_sensor_detach();
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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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const u32 *prop;
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int result;
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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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prop = of_get_property(ams_info.of_node, "reg", NULL);
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if (!prop)
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return -ENODEV;
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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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return result;
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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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return 0;
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}
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