LXR linux/drivers/mfd/tps65912-core.c

   1/*
   2 * tps65912-core.c  --  TI TPS65912x
   3 *
   4 * Copyright 2011 Texas Instruments Inc.
   5 *
   6 * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
   7 *
   8 *  This program is free software; you can redistribute it and/or modify it
   9 *  under  the terms of the GNU General  Public License as published by the
  10 *  Free Software Foundation;  either version 2 of the License, or (at your
  11 *  option) any later version.
  12 *
  13 *  This driver is based on wm8350 implementation.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/moduleparam.h>
  18#include <linux/init.h>
  19#include <linux/slab.h>
  20#include <linux/gpio.h>
  21#include <linux/mfd/core.h>
  22#include <linux/mfd/tps65912.h>
  23
  24static struct mfd_cell tps65912s[] = {
  25        {
  26                .name = "tps65912-pmic",
  27        },
  28};
  29
  30int tps65912_set_bits(struct tps65912 *tps65912, u8 reg, u8 mask)
  31{
  32        u8 data;
  33        int err;
  34
  35        mutex_lock(&tps65912->io_mutex);
  36
  37        err = tps65912->read(tps65912, reg, 1, &data);
  38        if (err) {
  39                dev_err(tps65912->dev, "Read from reg 0x%x failed\n", reg);
  40                goto out;
  41        }
  42
  43        data |= mask;
  44        err = tps65912->write(tps65912, reg, 1, &data);
  45        if (err)
  46                dev_err(tps65912->dev, "Write to reg 0x%x failed\n", reg);
  47
  48out:
  49        mutex_unlock(&tps65912->io_mutex);
  50        return err;
  51}
  52EXPORT_SYMBOL_GPL(tps65912_set_bits);
  53
  54int tps65912_clear_bits(struct tps65912 *tps65912, u8 reg, u8 mask)
  55{
  56        u8 data;
  57        int err;
  58
  59        mutex_lock(&tps65912->io_mutex);
  60        err = tps65912->read(tps65912, reg, 1, &data);
  61        if (err) {
  62                dev_err(tps65912->dev, "Read from reg 0x%x failed\n", reg);
  63                goto out;
  64        }
  65
  66        data &= ~mask;
  67        err = tps65912->write(tps65912, reg, 1, &data);
  68        if (err)
  69                dev_err(tps65912->dev, "Write to reg 0x%x failed\n", reg);
  70
  71out:
  72        mutex_unlock(&tps65912->io_mutex);
  73        return err;
  74}
  75EXPORT_SYMBOL_GPL(tps65912_clear_bits);
  76
  77static inline int tps65912_read(struct tps65912 *tps65912, u8 reg)
  78{
  79        u8 val;
  80        int err;
  81
  82        err = tps65912->read(tps65912, reg, 1, &val);
  83        if (err < 0)
  84                return err;
  85
  86        return val;
  87}
  88
  89static inline int tps65912_write(struct tps65912 *tps65912, u8 reg, u8 val)
  90{
  91        return tps65912->write(tps65912, reg, 1, &val);
  92}
  93
  94int tps65912_reg_read(struct tps65912 *tps65912, u8 reg)
  95{
  96        int data;
  97
  98        mutex_lock(&tps65912->io_mutex);
  99
 100        data = tps65912_read(tps65912, reg);
 101        if (data < 0)
 102                dev_err(tps65912->dev, "Read from reg 0x%x failed\n", reg);
 103
 104        mutex_unlock(&tps65912->io_mutex);
 105        return data;
 106}
 107EXPORT_SYMBOL_GPL(tps65912_reg_read);
 108
 109int tps65912_reg_write(struct tps65912 *tps65912, u8 reg, u8 val)
 110{
 111        int err;
 112
 113        mutex_lock(&tps65912->io_mutex);
 114
 115        err = tps65912_write(tps65912, reg, val);
 116        if (err < 0)
 117                dev_err(tps65912->dev, "Write for reg 0x%x failed\n", reg);
 118
 119        mutex_unlock(&tps65912->io_mutex);
 120        return err;
 121}
 122EXPORT_SYMBOL_GPL(tps65912_reg_write);
 123
 124int tps65912_device_init(struct tps65912 *tps65912)
 125{
 126        struct tps65912_board *pmic_plat_data = tps65912->dev->platform_data;
 127        struct tps65912_platform_data *init_data;
 128        int ret, dcdc_avs, value;
 129
 130        init_data = kzalloc(sizeof(struct tps65912_platform_data), GFP_KERNEL);
 131        if (init_data == NULL)
 132                return -ENOMEM;
 133
 134        mutex_init(&tps65912->io_mutex);
 135        dev_set_drvdata(tps65912->dev, tps65912);
 136
 137        dcdc_avs = (pmic_plat_data->is_dcdc1_avs << 0 |
 138                        pmic_plat_data->is_dcdc2_avs  << 1 |
 139                                pmic_plat_data->is_dcdc3_avs << 2 |
 140                                        pmic_plat_data->is_dcdc4_avs << 3);
 141        if (dcdc_avs) {
 142                tps65912->read(tps65912, TPS65912_I2C_SPI_CFG, 1, &value);
 143                dcdc_avs |= value;
 144                tps65912->write(tps65912, TPS65912_I2C_SPI_CFG, 1, &dcdc_avs);
 145        }
 146
 147        ret = mfd_add_devices(tps65912->dev, -1,
 148                              tps65912s, ARRAY_SIZE(tps65912s),
 149                              NULL, 0, NULL);
 150        if (ret < 0)
 151                goto err;
 152
 153        init_data->irq = pmic_plat_data->irq;
 154        init_data->irq_base = pmic_plat_data->irq_base;
 155        ret = tps65912_irq_init(tps65912, init_data->irq, init_data);
 156        if (ret < 0)
 157                goto err;
 158
 159        kfree(init_data);
 160        return ret;
 161
 162err:
 163        kfree(init_data);
 164        mfd_remove_devices(tps65912->dev);
 165        return ret;
 166}
 167
 168void tps65912_device_exit(struct tps65912 *tps65912)
 169{
 170        mfd_remove_devices(tps65912->dev);
 171        tps65912_irq_exit(tps65912);
 172}
 173
 174MODULE_AUTHOR("Margarita Olaya  <magi@slimlogic.co.uk>");
 175MODULE_DESCRIPTION("TPS65912x chip family multi-function driver");
 176MODULE_LICENSE("GPL");
 177