396 lines
8.5 KiB
C
396 lines
8.5 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/slab.h>
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#include <linux/mfd/pcf50633/core.h>
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int pcf50633_irq_init(struct pcf50633 *pcf, int irq);
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void pcf50633_irq_free(struct pcf50633 *pcf);
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#ifdef CONFIG_PM
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int pcf50633_irq_suspend(struct pcf50633 *pcf);
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int pcf50633_irq_resume(struct pcf50633 *pcf);
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#endif
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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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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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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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(*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 i2c_client *client, pm_message_t state)
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{
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struct pcf50633 *pcf;
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pcf = i2c_get_clientdata(client);
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return pcf50633_irq_suspend(pcf);
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}
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static int pcf50633_resume(struct i2c_client *client)
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{
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struct pcf50633 *pcf;
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pcf = i2c_get_clientdata(client);
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return pcf50633_irq_resume(pcf);
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}
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#else
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#define pcf50633_suspend NULL
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#define pcf50633_resume NULL
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#endif
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static int __devinit pcf50633_probe(struct i2c_client *client,
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const struct i2c_device_id *ids)
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{
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struct pcf50633 *pcf;
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struct pcf50633_platform_data *pdata = client->dev.platform_data;
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int i, ret;
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int version, variant;
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if (!client->irq) {
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dev_err(&client->dev, "Missing IRQ\n");
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return -ENOENT;
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}
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pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
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if (!pcf)
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return -ENOMEM;
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pcf->pdata = pdata;
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mutex_init(&pcf->lock);
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i2c_set_clientdata(client, pcf);
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pcf->dev = &client->dev;
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pcf->i2c_client = client;
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version = pcf50633_reg_read(pcf, 0);
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variant = pcf50633_reg_read(pcf, 1);
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if (version < 0 || variant < 0) {
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dev_err(pcf->dev, "Unable to probe pcf50633\n");
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ret = -ENODEV;
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goto err_free;
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}
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dev_info(pcf->dev, "Probed device version %d variant %d\n",
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version, variant);
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pcf50633_irq_init(pcf, client->irq);
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/* Create sub devices */
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pcf50633_client_dev_register(pcf, "pcf50633-input",
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&pcf->input_pdev);
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pcf50633_client_dev_register(pcf, "pcf50633-rtc",
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&pcf->rtc_pdev);
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pcf50633_client_dev_register(pcf, "pcf50633-mbc",
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&pcf->mbc_pdev);
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pcf50633_client_dev_register(pcf, "pcf50633-adc",
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&pcf->adc_pdev);
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pcf50633_client_dev_register(pcf, "pcf50633-backlight",
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&pcf->bl_pdev);
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for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
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struct platform_device *pdev;
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pdev = platform_device_alloc("pcf50633-regltr", i);
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if (!pdev) {
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dev_err(pcf->dev, "Cannot create regulator %d\n", i);
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continue;
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}
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pdev->dev.parent = pcf->dev;
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platform_device_add_data(pdev, &pdata->reg_init_data[i],
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sizeof(pdata->reg_init_data[i]));
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pcf->regulator_pdev[i] = pdev;
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platform_device_add(pdev);
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}
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ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
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if (ret)
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dev_err(pcf->dev, "error creating sysfs entries\n");
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if (pdata->probe_done)
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pdata->probe_done(pcf);
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return 0;
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err_free:
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kfree(pcf);
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return ret;
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}
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static int __devexit pcf50633_remove(struct i2c_client *client)
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{
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struct pcf50633 *pcf = i2c_get_clientdata(client);
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int i;
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pcf50633_irq_free(pcf);
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platform_device_unregister(pcf->input_pdev);
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platform_device_unregister(pcf->rtc_pdev);
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platform_device_unregister(pcf->mbc_pdev);
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platform_device_unregister(pcf->adc_pdev);
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for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
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platform_device_unregister(pcf->regulator_pdev[i]);
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kfree(pcf);
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return 0;
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}
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static struct i2c_device_id pcf50633_id_table[] = {
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{"pcf50633", 0x73},
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{/* end of list */}
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};
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static struct i2c_driver pcf50633_driver = {
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.driver = {
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.name = "pcf50633",
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},
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.id_table = pcf50633_id_table,
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.probe = pcf50633_probe,
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.remove = __devexit_p(pcf50633_remove),
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.suspend = pcf50633_suspend,
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.resume = pcf50633_resume,
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};
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static int __init pcf50633_init(void)
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{
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return i2c_add_driver(&pcf50633_driver);
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}
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static void __exit pcf50633_exit(void)
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{
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i2c_del_driver(&pcf50633_driver);
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}
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MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
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MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
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MODULE_LICENSE("GPL");
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subsys_initcall(pcf50633_init);
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module_exit(pcf50633_exit);
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