81e5d8646f
This causes i2c-powermac to register i2c devices exposed in the device-tree, enabling new-style probing of devices. Note that we prefix the IDs with "MAC," in order to prevent the generic drivers from matching. This is done on purpose as we only want drivers specifically tested/designed to operate on powermacs to match. This removes the special case we had for the AMS driver, and updates the driver's match table instead. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
277 lines
6.3 KiB
C
277 lines
6.3 KiB
C
/*
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* Apple Motion Sensor driver (I2C variant)
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*
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* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
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* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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*
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* Clean room implementation based on the reverse engineered Mac OS X driver by
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* Johannes Berg <johannes@sipsolutions.net>, documentation available at
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* http://johannes.sipsolutions.net/PowerBook/Apple_Motion_Sensor_Specification
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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/delay.h>
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#include "ams.h"
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/* AMS registers */
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#define AMS_COMMAND 0x00 /* command register */
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#define AMS_STATUS 0x01 /* status register */
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#define AMS_CTRL1 0x02 /* read control 1 (number of values) */
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#define AMS_CTRL2 0x03 /* read control 2 (offset?) */
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#define AMS_CTRL3 0x04 /* read control 3 (size of each value?) */
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#define AMS_DATA1 0x05 /* read data 1 */
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#define AMS_DATA2 0x06 /* read data 2 */
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#define AMS_DATA3 0x07 /* read data 3 */
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#define AMS_DATA4 0x08 /* read data 4 */
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#define AMS_DATAX 0x20 /* data X */
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#define AMS_DATAY 0x21 /* data Y */
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#define AMS_DATAZ 0x22 /* data Z */
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#define AMS_FREEFALL 0x24 /* freefall int control */
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#define AMS_SHOCK 0x25 /* shock int control */
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#define AMS_SENSLOW 0x26 /* sensitivity low limit */
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#define AMS_SENSHIGH 0x27 /* sensitivity high limit */
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#define AMS_CTRLX 0x28 /* control X */
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#define AMS_CTRLY 0x29 /* control Y */
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#define AMS_CTRLZ 0x2A /* control Z */
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#define AMS_UNKNOWN1 0x2B /* unknown 1 */
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#define AMS_UNKNOWN2 0x2C /* unknown 2 */
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#define AMS_UNKNOWN3 0x2D /* unknown 3 */
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#define AMS_VENDOR 0x2E /* vendor */
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/* AMS commands - use with the AMS_COMMAND register */
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enum ams_i2c_cmd {
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AMS_CMD_NOOP = 0,
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AMS_CMD_VERSION,
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AMS_CMD_READMEM,
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AMS_CMD_WRITEMEM,
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AMS_CMD_ERASEMEM,
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AMS_CMD_READEE,
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AMS_CMD_WRITEEE,
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AMS_CMD_RESET,
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AMS_CMD_START,
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};
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static int ams_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int ams_i2c_remove(struct i2c_client *client);
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static const struct i2c_device_id ams_id[] = {
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{ "MAC,accelerometer_1", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ams_id);
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static struct i2c_driver ams_i2c_driver = {
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.driver = {
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.name = "ams",
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.owner = THIS_MODULE,
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},
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.probe = ams_i2c_probe,
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.remove = ams_i2c_remove,
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.id_table = ams_id,
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};
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static s32 ams_i2c_read(u8 reg)
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{
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return i2c_smbus_read_byte_data(ams_info.i2c_client, reg);
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}
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static int ams_i2c_write(u8 reg, u8 value)
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{
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return i2c_smbus_write_byte_data(ams_info.i2c_client, reg, value);
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}
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static int ams_i2c_cmd(enum ams_i2c_cmd cmd)
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{
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s32 result;
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int count = 3;
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ams_i2c_write(AMS_COMMAND, cmd);
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msleep(5);
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while (count--) {
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result = ams_i2c_read(AMS_COMMAND);
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if (result == 0 || result & 0x80)
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return 0;
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schedule_timeout_uninterruptible(HZ / 20);
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}
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return -1;
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}
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static void ams_i2c_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_i2c_read(AMS_CTRLX);
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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_i2c_write(AMS_CTRLX, val);
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}
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if (reg & AMS_IRQ_SHOCK) {
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u8 val = ams_i2c_read(AMS_CTRLY);
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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_i2c_write(AMS_CTRLY, val);
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}
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if (reg & AMS_IRQ_GLOBAL) {
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u8 val = ams_i2c_read(AMS_CTRLZ);
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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_i2c_write(AMS_CTRLZ, val);
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}
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}
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static void ams_i2c_clear_irq(enum ams_irq reg)
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{
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if (reg & AMS_IRQ_FREEFALL)
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ams_i2c_write(AMS_FREEFALL, 0);
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if (reg & AMS_IRQ_SHOCK)
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ams_i2c_write(AMS_SHOCK, 0);
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}
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static u8 ams_i2c_get_vendor(void)
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{
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return ams_i2c_read(AMS_VENDOR);
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}
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static void ams_i2c_get_xyz(s8 *x, s8 *y, s8 *z)
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{
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*x = ams_i2c_read(AMS_DATAX);
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*y = ams_i2c_read(AMS_DATAY);
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*z = ams_i2c_read(AMS_DATAZ);
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}
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static int ams_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int vmaj, vmin;
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int result;
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/* There can be only one */
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if (unlikely(ams_info.has_device))
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return -ENODEV;
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ams_info.i2c_client = client;
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if (ams_i2c_cmd(AMS_CMD_RESET)) {
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printk(KERN_INFO "ams: Failed to reset the device\n");
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return -ENODEV;
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}
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if (ams_i2c_cmd(AMS_CMD_START)) {
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printk(KERN_INFO "ams: Failed to start the device\n");
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return -ENODEV;
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}
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/* get version/vendor information */
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ams_i2c_write(AMS_CTRL1, 0x02);
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ams_i2c_write(AMS_CTRL2, 0x85);
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ams_i2c_write(AMS_CTRL3, 0x01);
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ams_i2c_cmd(AMS_CMD_READMEM);
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vmaj = ams_i2c_read(AMS_DATA1);
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vmin = ams_i2c_read(AMS_DATA2);
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if (vmaj != 1 || vmin != 52) {
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printk(KERN_INFO "ams: Incorrect device version (%d.%d)\n",
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vmaj, vmin);
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return -ENODEV;
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}
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ams_i2c_cmd(AMS_CMD_VERSION);
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vmaj = ams_i2c_read(AMS_DATA1);
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vmin = ams_i2c_read(AMS_DATA2);
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if (vmaj != 0 || vmin != 1) {
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printk(KERN_INFO "ams: Incorrect firmware version (%d.%d)\n",
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vmaj, vmin);
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return -ENODEV;
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}
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/* Disable interrupts */
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ams_i2c_set_irq(AMS_IRQ_ALL, 0);
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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_i2c_write(AMS_SENSLOW, 0x15);
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ams_i2c_write(AMS_SENSHIGH, 0x60);
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ams_i2c_write(AMS_CTRLX, 0x08);
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ams_i2c_write(AMS_CTRLY, 0x0F);
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ams_i2c_write(AMS_CTRLZ, 0x4F);
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ams_i2c_write(AMS_UNKNOWN1, 0x14);
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/* Clear interrupts */
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ams_i2c_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_i2c_set_irq(AMS_IRQ_ALL, 1);
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printk(KERN_INFO "ams: Found I2C based motion sensor\n");
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return 0;
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}
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static int ams_i2c_remove(struct i2c_client *client)
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{
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if (ams_info.has_device) {
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ams_sensor_detach();
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/* Disable interrupts */
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ams_i2c_set_irq(AMS_IRQ_ALL, 0);
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/* Clear interrupts */
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ams_i2c_clear_irq(AMS_IRQ_ALL);
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printk(KERN_INFO "ams: Unloading\n");
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ams_info.has_device = 0;
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}
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return 0;
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}
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static void ams_i2c_exit(void)
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{
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i2c_del_driver(&ams_i2c_driver);
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}
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int __init ams_i2c_init(struct device_node *np)
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{
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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_i2c_exit;
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ams_info.get_vendor = ams_i2c_get_vendor;
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ams_info.get_xyz = ams_i2c_get_xyz;
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ams_info.clear_irq = ams_i2c_clear_irq;
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ams_info.bustype = BUS_I2C;
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result = i2c_add_driver(&ams_i2c_driver);
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return result;
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}
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