forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
197 lines
4.2 KiB
197 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Apple Motion Sensor driver (PMU variant) |
|
* |
|
* Copyright (C) 2006 Michael Hanselmann ([email protected]) |
|
*/ |
|
|
|
#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; |
|
}
|
|
|