710 lines
16 KiB
C
710 lines
16 KiB
C
/* NXP PCF50633 Power Management Unit (PMU) driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Harald Welte <laforge@openmoko.org>
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* Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/mfd/pcf50633/core.h>
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/* Two MBCS registers used during cold start */
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#define PCF50633_REG_MBCS1 0x4b
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#define PCF50633_REG_MBCS2 0x4c
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#define PCF50633_MBCS1_USBPRES 0x01
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#define PCF50633_MBCS1_ADAPTPRES 0x01
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static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
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{
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int ret;
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ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
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num, data);
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if (ret < 0)
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dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);
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return ret;
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}
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static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
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{
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int ret;
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ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
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num, data);
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if (ret < 0)
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dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);
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return ret;
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}
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/* Read a block of upto 32 regs */
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int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
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int nr_regs, u8 *data)
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{
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int ret;
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mutex_lock(&pcf->lock);
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ret = __pcf50633_read(pcf, reg, nr_regs, data);
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mutex_unlock(&pcf->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_read_block);
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/* Write a block of upto 32 regs */
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int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
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int nr_regs, u8 *data)
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{
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int ret;
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mutex_lock(&pcf->lock);
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ret = __pcf50633_write(pcf, reg, nr_regs, data);
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mutex_unlock(&pcf->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_write_block);
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u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
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{
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u8 val;
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mutex_lock(&pcf->lock);
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__pcf50633_read(pcf, reg, 1, &val);
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mutex_unlock(&pcf->lock);
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return val;
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}
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EXPORT_SYMBOL_GPL(pcf50633_reg_read);
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int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
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{
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int ret;
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mutex_lock(&pcf->lock);
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ret = __pcf50633_write(pcf, reg, 1, &val);
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mutex_unlock(&pcf->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_reg_write);
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int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
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{
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int ret;
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u8 tmp;
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val &= mask;
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mutex_lock(&pcf->lock);
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ret = __pcf50633_read(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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tmp &= ~mask;
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tmp |= val;
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ret = __pcf50633_write(pcf, reg, 1, &tmp);
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out:
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mutex_unlock(&pcf->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
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int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
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{
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int ret;
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u8 tmp;
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mutex_lock(&pcf->lock);
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ret = __pcf50633_read(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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tmp &= ~val;
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ret = __pcf50633_write(pcf, reg, 1, &tmp);
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out:
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mutex_unlock(&pcf->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
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/* sysfs attributes */
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static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct pcf50633 *pcf = dev_get_drvdata(dev);
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u8 dump[16];
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int n, n1, idx = 0;
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char *buf1 = buf;
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static u8 address_no_read[] = { /* must be ascending */
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PCF50633_REG_INT1,
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PCF50633_REG_INT2,
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PCF50633_REG_INT3,
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PCF50633_REG_INT4,
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PCF50633_REG_INT5,
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0 /* terminator */
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};
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for (n = 0; n < 256; n += sizeof(dump)) {
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for (n1 = 0; n1 < sizeof(dump); n1++)
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if (n == address_no_read[idx]) {
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idx++;
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dump[n1] = 0x00;
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} else
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dump[n1] = pcf50633_reg_read(pcf, n + n1);
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hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
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buf1 += strlen(buf1);
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*buf1++ = '\n';
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*buf1 = '\0';
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}
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return buf1 - buf;
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}
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static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
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static ssize_t show_resume_reason(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pcf50633 *pcf = dev_get_drvdata(dev);
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int n;
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n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
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pcf->resume_reason[0],
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pcf->resume_reason[1],
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pcf->resume_reason[2],
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pcf->resume_reason[3],
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pcf->resume_reason[4]);
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return n;
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}
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static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
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static struct attribute *pcf_sysfs_entries[] = {
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&dev_attr_dump_regs.attr,
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&dev_attr_resume_reason.attr,
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NULL,
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};
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static struct attribute_group pcf_attr_group = {
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.name = NULL, /* put in device directory */
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.attrs = pcf_sysfs_entries,
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};
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int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
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void (*handler) (int, void *), void *data)
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{
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if (irq < 0 || irq > PCF50633_NUM_IRQ || !handler)
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return -EINVAL;
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if (WARN_ON(pcf->irq_handler[irq].handler))
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return -EBUSY;
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mutex_lock(&pcf->lock);
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pcf->irq_handler[irq].handler = handler;
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pcf->irq_handler[irq].data = data;
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mutex_unlock(&pcf->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pcf50633_register_irq);
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int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
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{
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if (irq < 0 || irq > PCF50633_NUM_IRQ)
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return -EINVAL;
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mutex_lock(&pcf->lock);
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pcf->irq_handler[irq].handler = NULL;
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mutex_unlock(&pcf->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pcf50633_free_irq);
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static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
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{
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u8 reg, bits, tmp;
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int ret = 0, idx;
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idx = irq >> 3;
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reg = PCF50633_REG_INT1M + idx;
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bits = 1 << (irq & 0x07);
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mutex_lock(&pcf->lock);
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if (mask) {
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ret = __pcf50633_read(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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tmp |= bits;
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ret = __pcf50633_write(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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pcf->mask_regs[idx] &= ~bits;
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pcf->mask_regs[idx] |= bits;
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} else {
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ret = __pcf50633_read(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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tmp &= ~bits;
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ret = __pcf50633_write(pcf, reg, 1, &tmp);
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if (ret < 0)
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goto out;
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pcf->mask_regs[idx] &= ~bits;
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}
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out:
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mutex_unlock(&pcf->lock);
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return ret;
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}
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int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
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{
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dev_info(pcf->dev, "Masking IRQ %d\n", irq);
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return __pcf50633_irq_mask_set(pcf, irq, 1);
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_mask);
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int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
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{
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dev_info(pcf->dev, "Unmasking IRQ %d\n", irq);
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return __pcf50633_irq_mask_set(pcf, irq, 0);
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);
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int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
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{
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u8 reg, bits;
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reg = irq >> 3;
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bits = 1 << (irq & 0x07);
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return pcf->mask_regs[reg] & bits;
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);
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static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
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{
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if (pcf->irq_handler[irq].handler)
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pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
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}
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/* Maximum amount of time ONKEY is held before emergency action is taken */
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#define PCF50633_ONKEY1S_TIMEOUT 8
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static void pcf50633_irq_worker(struct work_struct *work)
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{
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struct pcf50633 *pcf;
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int ret, i, j;
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u8 pcf_int[5], chgstat;
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pcf = container_of(work, struct pcf50633, irq_work);
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/* Read the 5 INT regs in one transaction */
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ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
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ARRAY_SIZE(pcf_int), pcf_int);
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if (ret != ARRAY_SIZE(pcf_int)) {
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dev_err(pcf->dev, "Error reading INT registers\n");
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/*
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* If this doesn't ACK the interrupt to the chip, we'll be
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* called once again as we're level triggered.
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*/
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goto out;
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}
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/* We immediately read the usb and adapter status. We thus make sure
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* only of USBINS/USBREM IRQ handlers are called */
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if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
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chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
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if (chgstat & (0x3 << 4))
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pcf_int[0] &= ~(1 << PCF50633_INT1_USBREM);
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else
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pcf_int[0] &= ~(1 << PCF50633_INT1_USBINS);
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}
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/* Make sure only one of ADPINS or ADPREM is set */
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if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
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chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
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if (chgstat & (0x3 << 4))
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pcf_int[0] &= ~(1 << PCF50633_INT1_ADPREM);
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else
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pcf_int[0] &= ~(1 << PCF50633_INT1_ADPINS);
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}
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dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
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"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
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pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
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/* Some revisions of the chip don't have a 8s standby mode on
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* ONKEY1S press. We try to manually do it in such cases. */
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if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
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dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
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pcf->onkey1s_held);
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if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
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if (pcf->pdata->force_shutdown)
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pcf->pdata->force_shutdown(pcf);
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}
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if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
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dev_info(pcf->dev, "ONKEY1S held\n");
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pcf->onkey1s_held = 1 ;
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/* Unmask IRQ_SECOND */
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pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
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PCF50633_INT1_SECOND);
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/* Unmask IRQ_ONKEYR */
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pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
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PCF50633_INT2_ONKEYR);
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}
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if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
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pcf->onkey1s_held = 0;
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/* Mask SECOND and ONKEYR interrupts */
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if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
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pcf50633_reg_set_bit_mask(pcf,
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PCF50633_REG_INT1M,
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PCF50633_INT1_SECOND,
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PCF50633_INT1_SECOND);
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if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
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pcf50633_reg_set_bit_mask(pcf,
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PCF50633_REG_INT2M,
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PCF50633_INT2_ONKEYR,
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PCF50633_INT2_ONKEYR);
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}
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/* Have we just resumed ? */
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if (pcf->is_suspended) {
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pcf->is_suspended = 0;
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/* Set the resume reason filtering out non resumers */
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for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
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pcf->resume_reason[i] = pcf_int[i] &
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pcf->pdata->resumers[i];
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/* Make sure we don't pass on any ONKEY events to
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* userspace now */
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pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
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}
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for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
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/* Unset masked interrupts */
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pcf_int[i] &= ~pcf->mask_regs[i];
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for (j = 0; j < 8 ; j++)
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if (pcf_int[i] & (1 << j))
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pcf50633_irq_call_handler(pcf, (i * 8) + j);
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}
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out:
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put_device(pcf->dev);
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enable_irq(pcf->irq);
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}
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static irqreturn_t pcf50633_irq(int irq, void *data)
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{
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struct pcf50633 *pcf = data;
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dev_dbg(pcf->dev, "pcf50633_irq\n");
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get_device(pcf->dev);
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disable_irq_nosync(pcf->irq);
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schedule_work(&pcf->irq_work);
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return IRQ_HANDLED;
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}
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static void
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pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
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struct platform_device **pdev)
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{
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struct pcf50633_subdev_pdata *subdev_pdata;
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int ret;
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*pdev = platform_device_alloc(name, -1);
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if (!*pdev) {
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dev_err(pcf->dev, "Falied to allocate %s\n", name);
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return;
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}
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subdev_pdata = kmalloc(sizeof(*subdev_pdata), GFP_KERNEL);
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if (!subdev_pdata) {
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dev_err(pcf->dev, "Error allocating subdev pdata\n");
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platform_device_put(*pdev);
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}
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subdev_pdata->pcf = pcf;
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platform_device_add_data(*pdev, subdev_pdata, sizeof(*subdev_pdata));
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(*pdev)->dev.parent = pcf->dev;
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ret = platform_device_add(*pdev);
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if (ret) {
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dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
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platform_device_put(*pdev);
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*pdev = NULL;
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}
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}
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#ifdef CONFIG_PM
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static int pcf50633_suspend(struct device *dev, pm_message_t state)
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{
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struct pcf50633 *pcf;
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int ret = 0, i;
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u8 res[5];
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pcf = dev_get_drvdata(dev);
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/* Make sure our interrupt handlers are not called
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* henceforth */
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disable_irq(pcf->irq);
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/* Make sure that any running IRQ worker has quit */
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cancel_work_sync(&pcf->irq_work);
|
|
|
|
/* Save the masks */
|
|
ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
|
|
ARRAY_SIZE(pcf->suspend_irq_masks),
|
|
pcf->suspend_irq_masks);
|
|
if (ret < 0) {
|
|
dev_err(pcf->dev, "error saving irq masks\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Write wakeup irq masks */
|
|
for (i = 0; i < ARRAY_SIZE(res); i++)
|
|
res[i] = ~pcf->pdata->resumers[i];
|
|
|
|
ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
|
|
ARRAY_SIZE(res), &res[0]);
|
|
if (ret < 0) {
|
|
dev_err(pcf->dev, "error writing wakeup irq masks\n");
|
|
goto out;
|
|
}
|
|
|
|
pcf->is_suspended = 1;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int pcf50633_resume(struct device *dev)
|
|
{
|
|
struct pcf50633 *pcf;
|
|
int ret;
|
|
|
|
pcf = dev_get_drvdata(dev);
|
|
|
|
/* Write the saved mask registers */
|
|
ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
|
|
ARRAY_SIZE(pcf->suspend_irq_masks),
|
|
pcf->suspend_irq_masks);
|
|
if (ret < 0)
|
|
dev_err(pcf->dev, "Error restoring saved suspend masks\n");
|
|
|
|
/* Restore regulators' state */
|
|
|
|
|
|
get_device(pcf->dev);
|
|
|
|
/*
|
|
* Clear any pending interrupts and set resume reason if any.
|
|
* This will leave with enable_irq()
|
|
*/
|
|
pcf50633_irq_worker(&pcf->irq_work);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define pcf50633_suspend NULL
|
|
#define pcf50633_resume NULL
|
|
#endif
|
|
|
|
static int __devinit pcf50633_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *ids)
|
|
{
|
|
struct pcf50633 *pcf;
|
|
struct pcf50633_platform_data *pdata = client->dev.platform_data;
|
|
int i, ret = 0;
|
|
int version, variant;
|
|
|
|
pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
|
|
if (!pcf)
|
|
return -ENOMEM;
|
|
|
|
pcf->pdata = pdata;
|
|
|
|
mutex_init(&pcf->lock);
|
|
|
|
i2c_set_clientdata(client, pcf);
|
|
pcf->dev = &client->dev;
|
|
pcf->i2c_client = client;
|
|
pcf->irq = client->irq;
|
|
|
|
INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);
|
|
|
|
version = pcf50633_reg_read(pcf, 0);
|
|
variant = pcf50633_reg_read(pcf, 1);
|
|
if (version < 0 || variant < 0) {
|
|
dev_err(pcf->dev, "Unable to probe pcf50633\n");
|
|
ret = -ENODEV;
|
|
goto err;
|
|
}
|
|
|
|
dev_info(pcf->dev, "Probed device version %d variant %d\n",
|
|
version, variant);
|
|
|
|
/* Enable all interrupts except RTC SECOND */
|
|
pcf->mask_regs[0] = 0x80;
|
|
pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
|
|
pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
|
|
pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
|
|
pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
|
|
pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
|
|
|
|
/* Create sub devices */
|
|
pcf50633_client_dev_register(pcf, "pcf50633-input",
|
|
&pcf->input_pdev);
|
|
pcf50633_client_dev_register(pcf, "pcf50633-rtc",
|
|
&pcf->rtc_pdev);
|
|
pcf50633_client_dev_register(pcf, "pcf50633-mbc",
|
|
&pcf->mbc_pdev);
|
|
pcf50633_client_dev_register(pcf, "pcf50633-adc",
|
|
&pcf->adc_pdev);
|
|
|
|
for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
|
|
struct platform_device *pdev;
|
|
|
|
pdev = platform_device_alloc("pcf50633-regltr", i);
|
|
if (!pdev) {
|
|
dev_err(pcf->dev, "Cannot create regulator\n");
|
|
continue;
|
|
}
|
|
|
|
pdev->dev.parent = pcf->dev;
|
|
pdev->dev.platform_data = &pdata->reg_init_data[i];
|
|
dev_set_drvdata(&pdev->dev, pcf);
|
|
pcf->regulator_pdev[i] = pdev;
|
|
|
|
platform_device_add(pdev);
|
|
}
|
|
|
|
if (client->irq) {
|
|
ret = request_irq(client->irq, pcf50633_irq,
|
|
IRQF_TRIGGER_LOW, "pcf50633", pcf);
|
|
|
|
if (ret) {
|
|
dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
|
|
goto err;
|
|
}
|
|
} else {
|
|
dev_err(pcf->dev, "No IRQ configured\n");
|
|
goto err;
|
|
}
|
|
|
|
if (enable_irq_wake(client->irq) < 0)
|
|
dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
|
|
"in this hardware revision", client->irq);
|
|
|
|
ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
|
|
if (ret)
|
|
dev_err(pcf->dev, "error creating sysfs entries\n");
|
|
|
|
if (pdata->probe_done)
|
|
pdata->probe_done(pcf);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
kfree(pcf);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit pcf50633_remove(struct i2c_client *client)
|
|
{
|
|
struct pcf50633 *pcf = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
free_irq(pcf->irq, pcf);
|
|
|
|
platform_device_unregister(pcf->input_pdev);
|
|
platform_device_unregister(pcf->rtc_pdev);
|
|
platform_device_unregister(pcf->mbc_pdev);
|
|
platform_device_unregister(pcf->adc_pdev);
|
|
|
|
for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
|
|
platform_device_unregister(pcf->regulator_pdev[i]);
|
|
|
|
kfree(pcf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_device_id pcf50633_id_table[] = {
|
|
{"pcf50633", 0x73},
|
|
{/* end of list */}
|
|
};
|
|
|
|
static struct i2c_driver pcf50633_driver = {
|
|
.driver = {
|
|
.name = "pcf50633",
|
|
.suspend = pcf50633_suspend,
|
|
.resume = pcf50633_resume,
|
|
},
|
|
.id_table = pcf50633_id_table,
|
|
.probe = pcf50633_probe,
|
|
.remove = __devexit_p(pcf50633_remove),
|
|
};
|
|
|
|
static int __init pcf50633_init(void)
|
|
{
|
|
return i2c_add_driver(&pcf50633_driver);
|
|
}
|
|
|
|
static void __exit pcf50633_exit(void)
|
|
{
|
|
i2c_del_driver(&pcf50633_driver);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
|
|
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(pcf50633_init);
|
|
module_exit(pcf50633_exit);
|