pcf50633-core.c

Go to the documentation of this file.

/* NXP PCF50633 Power Management Unit (PMU) driver
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Harald Welte <[email protected]>
 *     Balaji Rao <[email protected]>
 * All rights reserved.
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/err.h>

#include <linux/mfd/pcf50633/core.h>

/* Read a block of up to 32 regs  */
int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
                    int nr_regs, u8 *data)
{
    int ret;

    ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs);
    if (ret != 0)
        return ret;

    return nr_regs;
}
EXPORT_SYMBOL_GPL(pcf50633_read_block);

/* Write a block of up to 32 regs  */
int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
                    int nr_regs, u8 *data)
{
    return regmap_raw_write(pcf->regmap, reg, data, nr_regs);
}
EXPORT_SYMBOL_GPL(pcf50633_write_block);

u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
{
    unsigned int val;
    int ret;

    ret = regmap_read(pcf->regmap, reg, &val);
    if (ret < 0)
        return -1;

    return val;
}
EXPORT_SYMBOL_GPL(pcf50633_reg_read);

int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
{
    return regmap_write(pcf->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(pcf50633_reg_write);

int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
{
    return regmap_update_bits(pcf->regmap, reg, mask, val);
}
EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);

int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
{
    return regmap_update_bits(pcf->regmap, reg, val, 0);
}
EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);

/* sysfs attributes */
static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct pcf50633 *pcf = dev_get_drvdata(dev);
    u8 dump[16];
    int n, n1, idx = 0;
    char *buf1 = buf;
    static u8 address_no_read[] = { /* must be ascending */
        PCF50633_REG_INT1,
        PCF50633_REG_INT2,
        PCF50633_REG_INT3,
        PCF50633_REG_INT4,
        PCF50633_REG_INT5,
        0 /* terminator */
    };

    for (n = 0; n < 256; n += sizeof(dump)) {
        for (n1 = 0; n1 < sizeof(dump); n1++)
            if (n == address_no_read[idx]) {
                idx++;
                dump[n1] = 0x00;
            } else
                dump[n1] = pcf50633_reg_read(pcf, n + n1);

        hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
        buf1 += strlen(buf1);
        *buf1++ = '\n';
        *buf1 = '\0';
    }

    return buf1 - buf;
}
static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);

static ssize_t show_resume_reason(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    struct pcf50633 *pcf = dev_get_drvdata(dev);
    int n;

    n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
                pcf->resume_reason[0],
                pcf->resume_reason[1],
                pcf->resume_reason[2],
                pcf->resume_reason[3],
                pcf->resume_reason[4]);

    return n;
}
static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);

static struct attribute *pcf_sysfs_entries[] = {
    &dev_attr_dump_regs.attr,
    &dev_attr_resume_reason.attr,
    NULL,
};

static struct attribute_group pcf_attr_group = {
    .name   = NULL,         /* put in device directory */
    .attrs  = pcf_sysfs_entries,
};

static void
pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
                        struct platform_device **pdev)
{
    int ret;

    *pdev = platform_device_alloc(name, -1);
    if (!*pdev) {
        dev_err(pcf->dev, "Falied to allocate %s\n", name);
        return;
    }

    (*pdev)->dev.parent = pcf->dev;

    ret = platform_device_add(*pdev);
    if (ret) {
        dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
        platform_device_put(*pdev);
        *pdev = NULL;
    }
}

#ifdef CONFIG_PM_SLEEP
static int pcf50633_suspend(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct pcf50633 *pcf = i2c_get_clientdata(client);

    return pcf50633_irq_suspend(pcf);
}

static int pcf50633_resume(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct pcf50633 *pcf = i2c_get_clientdata(client);

    return pcf50633_irq_resume(pcf);
}
#endif

static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);

static struct regmap_config pcf50633_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
};

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;
    int version, variant;

    if (!client->irq) {
        dev_err(&client->dev, "Missing IRQ\n");
        return -ENOENT;
    }

    pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
    if (!pcf)
        return -ENOMEM;

    pcf->pdata = pdata;

    mutex_init(&pcf->lock);

    pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config);
    if (IS_ERR(pcf->regmap)) {
        ret = PTR_ERR(pcf->regmap);
        dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret);
        return ret;
    }

    i2c_set_clientdata(client, pcf);
    pcf->dev = &client->dev;

    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;
        return ret;
    }

    dev_info(pcf->dev, "Probed device version %d variant %d\n",
                            version, variant);

    pcf50633_irq_init(pcf, client->irq);

    /* 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);
    pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_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 %d\n", i);
            continue;
        }

        pdev->dev.parent = pcf->dev;
        if (platform_device_add_data(pdev, &pdata->reg_init_data[i],
                    sizeof(pdata->reg_init_data[i])) < 0) {
            platform_device_put(pdev);
            dev_err(pcf->dev, "Out of memory for regulator parameters %d\n",
                                    i);
            continue;
        }
        pcf->regulator_pdev[i] = pdev;

        platform_device_add(pdev);
    }

    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;
}

static int __devexit pcf50633_remove(struct i2c_client *client)
{
    struct pcf50633 *pcf = i2c_get_clientdata(client);
    int i;

    sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
    pcf50633_irq_free(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);
    platform_device_unregister(pcf->bl_pdev);

    for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
        platform_device_unregister(pcf->regulator_pdev[i]);

    return 0;
}

static const struct i2c_device_id pcf50633_id_table[] = {
    {"pcf50633", 0x73},
    {/* end of list */}
};
MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);

static struct i2c_driver pcf50633_driver = {
    .driver = {
        .name   = "pcf50633",
        .pm = &pcf50633_pm,
    },
    .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 <[email protected]>");
MODULE_LICENSE("GPL");

subsys_initcall(pcf50633_init);
module_exit(pcf50633_exit);