drivers/mfd/sun4i-gpadc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* ADC MFD core driver for sunxi platforms
   3  *
   4  * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
   5  */
   6
   7 #include <linux/interrupt.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mfd/core.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14
  15 #include <linux/mfd/sun4i-gpadc.h>
  16
  17 #define ARCH_SUN4I_A10 0
  18 #define ARCH_SUN5I_A13 1
  19 #define ARCH_SUN6I_A31 2
  20
  21 static const struct resource adc_resources[] = {
  22         DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),
  23         DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),
  24 };
  25
  26 static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {
  27         REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
  28                        SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
  29         REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
  30                        SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
  31 };
  32
  33 static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {
  34         .name = "sun4i_gpadc_irq_chip",
  35         .status_base = SUN4I_GPADC_INT_FIFOS,
  36         .ack_base = SUN4I_GPADC_INT_FIFOS,
  37         .unmask_base = SUN4I_GPADC_INT_FIFOC,
  38         .init_ack_masked = true,
  39         .irqs = sun4i_gpadc_regmap_irq,
  40         .num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
  41         .num_regs = 1,
  42 };
  43
  44 static struct mfd_cell sun4i_gpadc_cells[] = {
  45         {
  46                 .name   = "sun4i-a10-gpadc-iio",
  47                 .resources = adc_resources,
  48                 .num_resources = ARRAY_SIZE(adc_resources),
  49         },
  50         { .name = "iio_hwmon" }
  51 };
  52
  53 static struct mfd_cell sun5i_gpadc_cells[] = {
  54         {
  55                 .name   = "sun5i-a13-gpadc-iio",
  56                 .resources = adc_resources,
  57                 .num_resources = ARRAY_SIZE(adc_resources),
  58         },
  59         { .name = "iio_hwmon" },
  60 };
  61
  62 static struct mfd_cell sun6i_gpadc_cells[] = {
  63         {
  64                 .name   = "sun6i-a31-gpadc-iio",
  65                 .resources = adc_resources,
  66                 .num_resources = ARRAY_SIZE(adc_resources),
  67         },
  68         { .name = "iio_hwmon" },
  69 };
  70
  71 static const struct regmap_config sun4i_gpadc_regmap_config = {
  72         .reg_bits = 32,
  73         .val_bits = 32,
  74         .reg_stride = 4,
  75         .fast_io = true,
  76 };
  77
  78 static const struct of_device_id sun4i_gpadc_of_match[] = {
  79         {
  80                 .compatible = "allwinner,sun4i-a10-ts",
  81                 .data = (void *)ARCH_SUN4I_A10,
  82         }, {
  83                 .compatible = "allwinner,sun5i-a13-ts",
  84                 .data = (void *)ARCH_SUN5I_A13,
  85         }, {
  86                 .compatible = "allwinner,sun6i-a31-ts",
  87                 .data = (void *)ARCH_SUN6I_A31,
  88         }, { /* sentinel */ }
  89 };
  90
  91 MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
  92
  93 static int sun4i_gpadc_probe(struct platform_device *pdev)
  94 {
  95         struct sun4i_gpadc_dev *dev;
  96         const struct of_device_id *of_id;
  97         const struct mfd_cell *cells;
  98         unsigned int irq, size;
  99         int ret;
 100
 101         of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
 102         if (!of_id)
 103                 return -EINVAL;
 104
 105         switch ((long)of_id->data) {
 106         case ARCH_SUN4I_A10:
 107                 cells = sun4i_gpadc_cells;
 108                 size = ARRAY_SIZE(sun4i_gpadc_cells);
 109                 break;
 110         case ARCH_SUN5I_A13:
 111                 cells = sun5i_gpadc_cells;
 112                 size = ARRAY_SIZE(sun5i_gpadc_cells);
 113                 break;
 114         case ARCH_SUN6I_A31:
 115                 cells = sun6i_gpadc_cells;
 116                 size = ARRAY_SIZE(sun6i_gpadc_cells);
 117                 break;
 118         default:
 119                 return -EINVAL;
 120         }
 121
 122         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 123         if (!dev)
 124                 return -ENOMEM;
 125
 126         dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 127         if (IS_ERR(dev->base))
 128                 return PTR_ERR(dev->base);
 129
 130         dev->dev = &pdev->dev;
 131         dev_set_drvdata(dev->dev, dev);
 132
 133         dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
 134                                             &sun4i_gpadc_regmap_config);
 135         if (IS_ERR(dev->regmap)) {
 136                 ret = PTR_ERR(dev->regmap);
 137                 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
 138                 return ret;
 139         }
 140
 141         /* Disable all interrupts */
 142         regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
 143
 144         irq = platform_get_irq(pdev, 0);
 145         ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
 146                                        IRQF_ONESHOT, 0,
 147                                        &sun4i_gpadc_regmap_irq_chip,
 148                                        &dev->regmap_irqc);
 149         if (ret) {
 150                 dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
 151                 return ret;
 152         }
 153
 154         ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
 155         if (ret) {
 156                 dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
 157                 return ret;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static struct platform_driver sun4i_gpadc_driver = {
 164         .driver = {
 165                 .name = "sun4i-gpadc",
 166                 .of_match_table = sun4i_gpadc_of_match,
 167         },
 168         .probe = sun4i_gpadc_probe,
 169 };
 170
 171 module_platform_driver(sun4i_gpadc_driver);
 172
 173 MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
 174 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 175 MODULE_LICENSE("GPL v2");