LXR uboot/drivers/power/regulator/gpio-regulator.c

   1/*
   2 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
   3 * Keerthy <j-keerthy@ti.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <fdtdec.h>
  10#include <errno.h>
  11#include <dm.h>
  12#include <i2c.h>
  13#include <asm/gpio.h>
  14#include <power/pmic.h>
  15#include <power/regulator.h>
  16
  17#define GPIO_REGULATOR_MAX_STATES       2
  18
  19DECLARE_GLOBAL_DATA_PTR;
  20
  21struct gpio_regulator_platdata {
  22        struct gpio_desc gpio; /* GPIO for regulator voltage control */
  23        int states[GPIO_REGULATOR_MAX_STATES];
  24        int voltages[GPIO_REGULATOR_MAX_STATES];
  25};
  26
  27static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
  28{
  29        struct dm_regulator_uclass_platdata *uc_pdata;
  30        struct gpio_regulator_platdata *dev_pdata;
  31        struct gpio_desc *gpio;
  32        const void *blob = gd->fdt_blob;
  33        int node = dev->of_offset;
  34        int ret, count, i, j;
  35        u32 states_array[8];
  36
  37        dev_pdata = dev_get_platdata(dev);
  38        uc_pdata = dev_get_uclass_platdata(dev);
  39        if (!uc_pdata)
  40                return -ENXIO;
  41
  42        /* Set type to gpio */
  43        uc_pdata->type = REGULATOR_TYPE_GPIO;
  44
  45        /*
  46         * Get gpio regulator gpio desc
  47         * Assuming one GPIO per regulator.
  48         * Can be extended later to multiple GPIOs
  49         * per gpio-regulator. As of now no instance with multiple
  50         * gpios is presnt
  51         */
  52        gpio = &dev_pdata->gpio;
  53        ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
  54        if (ret)
  55                debug("regulator gpio - not found! Error: %d", ret);
  56
  57        count = fdtdec_get_int_array_count(blob, node, "states",
  58                                           states_array, 8);
  59
  60        if (!count)
  61                return -EINVAL;
  62
  63        for (i = 0, j = 0; i < count; i += 2) {
  64                dev_pdata->voltages[j] = states_array[i];
  65                dev_pdata->states[j] = states_array[i + 1];
  66                j++;
  67        }
  68
  69        return 0;
  70}
  71
  72static int gpio_regulator_get_value(struct udevice *dev)
  73{
  74        struct dm_regulator_uclass_platdata *uc_pdata;
  75        struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
  76        int enable;
  77
  78        if (!dev_pdata->gpio.dev)
  79                return -ENOSYS;
  80
  81        uc_pdata = dev_get_uclass_platdata(dev);
  82        if (uc_pdata->min_uV > uc_pdata->max_uV) {
  83                debug("Invalid constraints for: %s\n", uc_pdata->name);
  84                return -EINVAL;
  85        }
  86
  87        enable = dm_gpio_get_value(&dev_pdata->gpio);
  88        if (enable == dev_pdata->states[0])
  89                return dev_pdata->voltages[0];
  90        else
  91                return dev_pdata->voltages[1];
  92}
  93
  94static int gpio_regulator_set_value(struct udevice *dev, int uV)
  95{
  96        struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
  97        int ret;
  98        bool enable;
  99
 100        if (!dev_pdata->gpio.dev)
 101                return -ENOSYS;
 102
 103        if (uV == dev_pdata->voltages[0])
 104                enable = dev_pdata->states[0];
 105        else if (uV == dev_pdata->voltages[1])
 106                enable = dev_pdata->states[1];
 107        else
 108                return -EINVAL;
 109
 110        ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
 111        if (ret) {
 112                error("Can't set regulator : %s gpio to: %d\n", dev->name,
 113                      enable);
 114                return ret;
 115        }
 116
 117        return 0;
 118}
 119
 120static const struct dm_regulator_ops gpio_regulator_ops = {
 121        .get_value      = gpio_regulator_get_value,
 122        .set_value      = gpio_regulator_set_value,
 123};
 124
 125static const struct udevice_id gpio_regulator_ids[] = {
 126        { .compatible = "regulator-gpio" },
 127        { },
 128};
 129
 130U_BOOT_DRIVER(gpio_regulator) = {
 131        .name = "gpio regulator",
 132        .id = UCLASS_REGULATOR,
 133        .ops = &gpio_regulator_ops,
 134        .of_match = gpio_regulator_ids,
 135        .ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
 136        .platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
 137};
 138