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 };
  25
  26 static const struct regmap_irq max77620_gpio_irqs[] = {
  27         [0] = {
  28                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0,
  29                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  30                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  31                 .reg_offset = 0,
  32                 .type_reg_offset = 0,
  33         },
  34         [1] = {
  35                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1,
  36                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  37                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  38                 .reg_offset = 0,
  39                 .type_reg_offset = 1,
  40         },
  41         [2] = {
  42                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2,
  43                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  44                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  45                 .reg_offset = 0,
  46                 .type_reg_offset = 2,
  47         },
  48         [3] = {
  49                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3,
  50                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  51                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  52                 .reg_offset = 0,
  53                 .type_reg_offset = 3,
  54         },
  55         [4] = {
  56                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4,
  57                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  58                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  59                 .reg_offset = 0,
  60                 .type_reg_offset = 4,
  61         },
  62         [5] = {
  63                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5,
  64                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  65                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  66                 .reg_offset = 0,
  67                 .type_reg_offset = 5,
  68         },
  69         [6] = {
  70                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6,
  71                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  72                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  73                 .reg_offset = 0,
  74                 .type_reg_offset = 6,
  75         },
  76         [7] = {
  77                 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7,
  78                 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
  79                 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
  80                 .reg_offset = 0,
  81                 .type_reg_offset = 7,
  82         },
  83 };
  84
  85 static const struct regmap_irq_chip max77620_gpio_irq_chip = {
  86         .name = "max77620-gpio",
  87         .irqs = max77620_gpio_irqs,
  88         .num_irqs = ARRAY_SIZE(max77620_gpio_irqs),
  89         .num_regs = 1,
  90         .num_type_reg = 8,
  91         .irq_reg_stride = 1,
  92         .type_reg_stride = 1,
  93         .status_base = MAX77620_REG_IRQ_LVL2_GPIO,
  94         .type_base = MAX77620_REG_GPIO0,
  95 };
  96
  97 static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
  98 {
  99         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 100         int ret;
 101
 102         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 103                                  MAX77620_CNFG_GPIO_DIR_MASK,
 104                                  MAX77620_CNFG_GPIO_DIR_INPUT);
 105         if (ret < 0)
 106                 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
 107
 108         return ret;
 109 }
 110
 111 static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
 112 {
 113         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 114         unsigned int val;
 115         int ret;
 116
 117         ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
 118         if (ret < 0) {
 119                 dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
 120                 return ret;
 121         }
 122
 123         if  (val & MAX77620_CNFG_GPIO_DIR_MASK)
 124                 return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
 125         else
 126                 return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
 127 }
 128
 129 static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
 130                                     int value)
 131 {
 132         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 133         u8 val;
 134         int ret;
 135
 136         val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 137                                 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
 138
 139         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 140                                  MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 141         if (ret < 0) {
 142                 dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
 143                 return ret;
 144         }
 145
 146         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 147                                  MAX77620_CNFG_GPIO_DIR_MASK,
 148                                  MAX77620_CNFG_GPIO_DIR_OUTPUT);
 149         if (ret < 0)
 150                 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
 151
 152         return ret;
 153 }
 154
 155 static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
 156                                       unsigned int offset,
 157                                       unsigned int debounce)
 158 {
 159         u8 val;
 160         int ret;
 161
 162         switch (debounce) {
 163         case 0:
 164                 val = MAX77620_CNFG_GPIO_DBNC_None;
 165                 break;
 166         case 1 ... 8:
 167                 val = MAX77620_CNFG_GPIO_DBNC_8ms;
 168                 break;
 169         case 9 ... 16:
 170                 val = MAX77620_CNFG_GPIO_DBNC_16ms;
 171                 break;
 172         case 17 ... 32:
 173                 val = MAX77620_CNFG_GPIO_DBNC_32ms;
 174                 break;
 175         default:
 176                 dev_err(mgpio->dev, "Illegal value %u\n", debounce);
 177                 return -EINVAL;
 178         }
 179
 180         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 181                                  MAX77620_CNFG_GPIO_DBNC_MASK, val);
 182         if (ret < 0)
 183                 dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);
 184
 185         return ret;
 186 }
 187
 188 static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
 189                               int value)
 190 {
 191         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 192         u8 val;
 193         int ret;
 194
 195         val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 196                                 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
 197
 198         ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 199                                  MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 200         if (ret < 0)
 201                 dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
 202 }
 203
 204 static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 205                                     unsigned long config)
 206 {
 207         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 208
 209         switch (pinconf_to_config_param(config)) {
 210         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 211                 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 212                                           MAX77620_CNFG_GPIO_DRV_MASK,
 213                                           MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
 214         case PIN_CONFIG_DRIVE_PUSH_PULL:
 215                 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 216                                           MAX77620_CNFG_GPIO_DRV_MASK,
 217                                           MAX77620_CNFG_GPIO_DRV_PUSHPULL);
 218         case PIN_CONFIG_INPUT_DEBOUNCE:
 219                 return max77620_gpio_set_debounce(mgpio, offset,
 220                         pinconf_to_config_argument(config));
 221         default:
 222                 break;
 223         }
 224
 225         return -ENOTSUPP;
 226 }
 227
 228 static int max77620_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
 229 {
 230         struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 231         struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent);
 232
 233         return regmap_irq_get_virq(chip->gpio_irq_data, offset);
 234 }
 235
 236 static int max77620_gpio_probe(struct platform_device *pdev)
 237 {
 238         struct max77620_chip *chip =  dev_get_drvdata(pdev->dev.parent);
 239         struct max77620_gpio *mgpio;
 240         int gpio_irq;
 241         int ret;
 242
 243         gpio_irq = platform_get_irq(pdev, 0);
 244         if (gpio_irq <= 0) {
 245                 dev_err(&pdev->dev, "GPIO irq not available %d\n", gpio_irq);
 246                 return -ENODEV;
 247         }
 248
 249         mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
 250         if (!mgpio)
 251                 return -ENOMEM;
 252
 253         mgpio->rmap = chip->rmap;
 254         mgpio->dev = &pdev->dev;
 255
 256         mgpio->gpio_chip.label = pdev->name;
 257         mgpio->gpio_chip.parent = &pdev->dev;
 258         mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
 259         mgpio->gpio_chip.get = max77620_gpio_get;
 260         mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
 261         mgpio->gpio_chip.set = max77620_gpio_set;
 262         mgpio->gpio_chip.set_config = max77620_gpio_set_config;
 263         mgpio->gpio_chip.to_irq = max77620_gpio_to_irq;
 264         mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
 265         mgpio->gpio_chip.can_sleep = 1;
 266         mgpio->gpio_chip.base = -1;
 267 #ifdef CONFIG_OF_GPIO
 268         mgpio->gpio_chip.of_node = pdev->dev.parent->of_node;
 269 #endif
 270
 271         platform_set_drvdata(pdev, mgpio);
 272
 273         ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
 274         if (ret < 0) {
 275                 dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
 276                 return ret;
 277         }
 278
 279         ret = devm_regmap_add_irq_chip(&pdev->dev, chip->rmap, gpio_irq,
 280                                        IRQF_ONESHOT, -1,
 281                                        &max77620_gpio_irq_chip,
 282                                        &chip->gpio_irq_data);
 283         if (ret < 0) {
 284                 dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret);
 285                 return ret;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static const struct platform_device_id max77620_gpio_devtype[] = {
 292         { .name = "max77620-gpio", },
 293         { .name = "max20024-gpio", },
 294         {},
 295 };
 296 MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);
 297
 298 static struct platform_driver max77620_gpio_driver = {
 299         .driver.name    = "max77620-gpio",
 300         .probe          = max77620_gpio_probe,
 301         .id_table       = max77620_gpio_devtype,
 302 };
 303
 304 module_platform_driver(max77620_gpio_driver);
 305
 306 MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
 307 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 308 MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
 309 MODULE_ALIAS("platform:max77620-gpio");
 310 MODULE_LICENSE("GPL v2");