drivers/gpio/gpio-max77620.c

   1 /*
   2  * MAXIM MAX77620 GPIO driver
   3  *
   4  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/gpio/driver.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/mfd/max77620.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regmap.h>
  17
  18 #define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)
  19
  20 struct max77620_gpio {
  21         struct gpio_chip        gpio_chip;
  22         struct regmap           *rmap;
  23         struct device           *dev;
  24         int                     gpio_irq;
  25         int                     irq_base;
  26         int                     gpio_base;
  27 };
  28
  29 static const struct regmap_irq max77620_gpio_irqs[] = {
  30         [0] = {
  31                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0,
  32                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  33                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  34                 .reg_offset = 0,
  35                 .type_reg_offset = 0,
  36         },
  37         [1] = {
  38                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1,
  39                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  40                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  41                 .reg_offset = 0,
  42                 .type_reg_offset = 1,
  43         },
  44         [2] = {
  45                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2,
  46                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  47                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  48                 .reg_offset = 0,
  49                 .type_reg_offset = 2,
  50         },
  51         [3] = {
  52                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3,
  53                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  54                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  55                 .reg_offset = 0,
  56                 .type_reg_offset = 3,
  57         },
  58         [4] = {
  59                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4,
  60                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  61                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  62                 .reg_offset = 0,
  63                 .type_reg_offset = 4,
  64         },
  65         [5] = {
  66                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5,
  67                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  68                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  69                 .reg_offset = 0,
  70                 .type_reg_offset = 5,
  71         },
  72         [6] = {
  73                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6,
  74                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  75                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  76                 .reg_offset = 0,
  77                 .type_reg_offset = 6,
  78         },
  79         [7] = {
  80                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7,
  81                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  82                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  83                 .reg_offset = 0,
  84                 .type_reg_offset = 7,
  85         },
  86 };
  87
  88 static struct regmap_irq_chip max77620_gpio_irq_chip = {
  89         .name = "max77620-gpio",
  90         .irqs = max77620_gpio_irqs,
  91         .num_irqs = ARRAY_SIZE(max77620_gpio_irqs),
  92         .num_regs = 1,
  93         .num_type_reg = 8,
  94         .irq_reg_stride = 1,
  95         .type_reg_stride = 1,
  96         .status_base = MAX77620_REG_IRQ_LVL2_GPIO,
  97         .type_base = MAX77620_REG_GPIO0,
  98 };
  99
 100 static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
 101 {
 102         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 103         int ret;
 104
 105         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 106                                  MAX77620_CNFG_GPIO_DIR_MASK,
 107                                  MAX77620_CNFG_GPIO_DIR_INPUT);
 108         if (ret < 0)
 109                 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
 110
 111         return ret;
 112 }
 113
 114 static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
 115 {
 116         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 117         unsigned int val;
 118         int ret;
 119
 120         ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
 121         if (ret < 0) {
 122                 dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
 123                 return ret;
 124         }
 125
 126         if  (val & MAX77620_CNFG_GPIO_DIR_MASK)
 127                 return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
 128         else
 129                 return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
 130 }
 131
 132 static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
 133                                     int value)
 134 {
 135         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 136         u8 val;
 137         int ret;
 138
 139         val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 140                                 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
 141
 142         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 143                                  MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 144         if (ret < 0) {
 145                 dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
 146                 return ret;
 147         }
 148
 149         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 150                                  MAX77620_CNFG_GPIO_DIR_MASK,
 151                                  MAX77620_CNFG_GPIO_DIR_OUTPUT);
 152         if (ret < 0)
 153                 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
 154
 155         return ret;
 156 }
 157
 158 static int max77620_gpio_set_debounce(struct gpio_chip *gc,
 159                                       unsigned int offset,
 160                                       unsigned int debounce)
 161 {
 162         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 163         u8 val;
 164         int ret;
 165
 166         switch (debounce) {
 167         case 0:
 168                 val = MAX77620_CNFG_GPIO_DBNC_None;
 169                 break;
 170         case 1 ... 8:
 171                 val = MAX77620_CNFG_GPIO_DBNC_8ms;
 172                 break;
 173         case 9 ... 16:
 174                 val = MAX77620_CNFG_GPIO_DBNC_16ms;
 175                 break;
 176         case 17 ... 32:
 177                 val = MAX77620_CNFG_GPIO_DBNC_32ms;
 178                 break;
 179         default:
 180                 dev_err(mgpio->dev, "Illegal value %u\n", debounce);
 181                 return -EINVAL;
 182         }
 183
 184         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 185                                  MAX77620_CNFG_GPIO_DBNC_MASK, val);
 186         if (ret < 0)
 187                 dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);
 188
 189         return ret;
 190 }
 191
 192 static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
 193                               int value)
 194 {
 195         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 196         u8 val;
 197         int ret;
 198
 199         val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 200                                 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
 201
 202         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 203                                  MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 204         if (ret < 0)
 205                 dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
 206 }
 207
 208 static int max77620_gpio_set_single_ended(struct gpio_chip *gc,
 209                                           unsigned int offset,
 210                                           enum single_ended_mode mode)
 211 {
 212         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 213
 214         switch (mode) {
 215         case LINE_MODE_OPEN_DRAIN:
 216                 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 217                                           MAX77620_CNFG_GPIO_DRV_MASK,
 218                                           MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
 219         case LINE_MODE_PUSH_PULL:
 220                 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 221                                           MAX77620_CNFG_GPIO_DRV_MASK,
 222                                           MAX77620_CNFG_GPIO_DRV_PUSHPULL);
 223         default:
 224                 break;
 225         }
 226
 227         return -ENOTSUPP;
 228 }
 229
 230 static int max77620_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
 231 {
 232         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 233         struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent);
 234
 235         return regmap_irq_get_virq(chip->gpio_irq_data, offset);
 236 }
 237
 238 static int max77620_gpio_probe(struct platform_device *pdev)
 239 {
 240         struct max77620_chip *chip =  dev_get_drvdata(pdev->dev.parent);
 241         struct max77620_gpio *mgpio;
 242         int gpio_irq;
 243         int ret;
 244
 245         gpio_irq = platform_get_irq(pdev, 0);
 246         if (gpio_irq <= 0) {
 247                 dev_err(&pdev->dev, "GPIO irq not available %d\n", gpio_irq);
 248                 return -ENODEV;
 249         }
 250
 251         mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
 252         if (!mgpio)
 253                 return -ENOMEM;
 254
 255         mgpio->rmap = chip->rmap;
 256         mgpio->dev = &pdev->dev;
 257         mgpio->gpio_irq = gpio_irq;
 258
 259         mgpio->gpio_chip.label = pdev->name;
 260         mgpio->gpio_chip.parent = &pdev->dev;
 261         mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
 262         mgpio->gpio_chip.get = max77620_gpio_get;
 263         mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
 264         mgpio->gpio_chip.set_debounce = max77620_gpio_set_debounce;
 265         mgpio->gpio_chip.set = max77620_gpio_set;
 266         mgpio->gpio_chip.set_single_ended = max77620_gpio_set_single_ended;
 267         mgpio->gpio_chip.to_irq = max77620_gpio_to_irq;
 268         mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
 269         mgpio->gpio_chip.can_sleep = 1;
 270         mgpio->gpio_chip.base = -1;
 271         mgpio->irq_base = -1;
 272 #ifdef CONFIG_OF_GPIO
 273         mgpio->gpio_chip.of_node = pdev->dev.parent->of_node;
 274 #endif
 275
 276         platform_set_drvdata(pdev, mgpio);
 277
 278         ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
 279         if (ret < 0) {
 280                 dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
 281                 return ret;
 282         }
 283
 284         mgpio->gpio_base = mgpio->gpio_chip.base;
 285         ret = devm_regmap_add_irq_chip(&pdev->dev, chip->rmap, mgpio->gpio_irq,
 286                                        IRQF_ONESHOT, mgpio->irq_base,
 287                                        &max77620_gpio_irq_chip,
 288                                        &chip->gpio_irq_data);
 289         if (ret < 0) {
 290                 dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret);
 291                 return ret;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static const struct platform_device_id max77620_gpio_devtype[] = {
 298         { .name = "max77620-gpio", },
 299         {},
 300 };
 301 MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);
 302
 303 static struct platform_driver max77620_gpio_driver = {
 304         .driver.name    = "max77620-gpio",
 305         .probe          = max77620_gpio_probe,
 306         .id_table       = max77620_gpio_devtype,
 307 };
 308
 309 module_platform_driver(max77620_gpio_driver);
 310
 311 MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
 312 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 313 MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
 314 MODULE_ALIAS("platform:max77620-gpio");
 315 MODULE_LICENSE("GPL v2");