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_device.h>
  12 #include <linux/of_irq.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         .mask_base = SUN4I_GPADC_INT_FIFOC,
  38         .init_ack_masked = true,
  39         .mask_invert = true,
  40         .irqs = sun4i_gpadc_regmap_irq,
  41         .num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
  42         .num_regs = 1,
  43 };
  44
  45 static struct mfd_cell sun4i_gpadc_cells[] = {
  46         {
  47                 .name   = "sun4i-a10-gpadc-iio",
  48                 .resources = adc_resources,
  49                 .num_resources = ARRAY_SIZE(adc_resources),
  50         },
  51         { .name = "iio_hwmon" }
  52 };
  53
  54 static struct mfd_cell sun5i_gpadc_cells[] = {
  55         {
  56                 .name   = "sun5i-a13-gpadc-iio",
  57                 .resources = adc_resources,
  58                 .num_resources = ARRAY_SIZE(adc_resources),
  59         },
  60         { .name = "iio_hwmon" },
  61 };
  62
  63 static struct mfd_cell sun6i_gpadc_cells[] = {
  64         {
  65                 .name   = "sun6i-a31-gpadc-iio",
  66                 .resources = adc_resources,
  67                 .num_resources = ARRAY_SIZE(adc_resources),
  68         },
  69         { .name = "iio_hwmon" },
  70 };
  71
  72 static const struct regmap_config sun4i_gpadc_regmap_config = {
  73         .reg_bits = 32,
  74         .val_bits = 32,
  75         .reg_stride = 4,
  76         .fast_io = true,
  77 };
  78
  79 static const struct of_device_id sun4i_gpadc_of_match[] = {
  80         {
  81                 .compatible = "allwinner,sun4i-a10-ts",
  82                 .data = (void *)ARCH_SUN4I_A10,
  83         }, {
  84                 .compatible = "allwinner,sun5i-a13-ts",
  85                 .data = (void *)ARCH_SUN5I_A13,
  86         }, {
  87                 .compatible = "allwinner,sun6i-a31-ts",
  88                 .data = (void *)ARCH_SUN6I_A31,
  89         }, { /* sentinel */ }
  90 };
  91
  92 MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
  93
  94 static int sun4i_gpadc_probe(struct platform_device *pdev)
  95 {
  96         struct sun4i_gpadc_dev *dev;
  97         struct resource *mem;
  98         const struct of_device_id *of_id;
  99         const struct mfd_cell *cells;
 100         unsigned int irq, size;
 101         int ret;
 102
 103         of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
 104         if (!of_id)
 105                 return -EINVAL;
 106
 107         switch ((long)of_id->data) {
 108         case ARCH_SUN4I_A10:
 109                 cells = sun4i_gpadc_cells;
 110                 size = ARRAY_SIZE(sun4i_gpadc_cells);
 111                 break;
 112         case ARCH_SUN5I_A13:
 113                 cells = sun5i_gpadc_cells;
 114                 size = ARRAY_SIZE(sun5i_gpadc_cells);
 115                 break;
 116         case ARCH_SUN6I_A31:
 117                 cells = sun6i_gpadc_cells;
 118                 size = ARRAY_SIZE(sun6i_gpadc_cells);
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 125         if (!dev)
 126                 return -ENOMEM;
 127
 128         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 129         dev->base = devm_ioremap_resource(&pdev->dev, mem);
 130         if (IS_ERR(dev->base))
 131                 return PTR_ERR(dev->base);
 132
 133         dev->dev = &pdev->dev;
 134         dev_set_drvdata(dev->dev, dev);
 135
 136         dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
 137                                             &sun4i_gpadc_regmap_config);
 138         if (IS_ERR(dev->regmap)) {
 139                 ret = PTR_ERR(dev->regmap);
 140                 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
 141                 return ret;
 142         }
 143
 144         /* Disable all interrupts */
 145         regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
 146
 147         irq = platform_get_irq(pdev, 0);
 148         ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
 149                                        IRQF_ONESHOT, 0,
 150                                        &sun4i_gpadc_regmap_irq_chip,
 151                                        &dev->regmap_irqc);
 152         if (ret) {
 153                 dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
 154                 return ret;
 155         }
 156
 157         ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
 158         if (ret) {
 159                 dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
 160                 return ret;
 161         }
 162
 163         return 0;
 164 }
 165
 166 static struct platform_driver sun4i_gpadc_driver = {
 167         .driver = {
 168                 .name = "sun4i-gpadc",
 169                 .of_match_table = sun4i_gpadc_of_match,
 170         },
 171         .probe = sun4i_gpadc_probe,
 172 };
 173
 174 module_platform_driver(sun4i_gpadc_driver);
 175
 176 MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
 177 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 178 MODULE_LICENSE("GPL v2");