drivers/gpio/gpio-da9052.c

   1 /*
   2  * GPIO Driver for Dialog DA9052 PMICs.
   3  *
   4  * Copyright(c) 2011 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14 #include <linux/module.h>
  15 #include <linux/fs.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/gpio/driver.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/seq_file.h>
  21
  22 #include <linux/mfd/da9052/da9052.h>
  23 #include <linux/mfd/da9052/reg.h>
  24 #include <linux/mfd/da9052/pdata.h>
  25
  26 #define DA9052_INPUT                            1
  27 #define DA9052_OUTPUT_OPENDRAIN         2
  28 #define DA9052_OUTPUT_PUSHPULL                  3
  29
  30 #define DA9052_SUPPLY_VDD_IO1                   0
  31
  32 #define DA9052_DEBOUNCING_OFF                   0
  33 #define DA9052_DEBOUNCING_ON                    1
  34
  35 #define DA9052_OUTPUT_LOWLEVEL                  0
  36
  37 #define DA9052_ACTIVE_LOW                       0
  38 #define DA9052_ACTIVE_HIGH                      1
  39
  40 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER      8
  41 #define DA9052_GPIO_SHIFT_COUNT(no)             (no%8)
  42 #define DA9052_GPIO_MASK_UPPER_NIBBLE           0xF0
  43 #define DA9052_GPIO_MASK_LOWER_NIBBLE           0x0F
  44 #define DA9052_GPIO_NIBBLE_SHIFT                4
  45 #define DA9052_IRQ_GPI0                 16
  46 #define DA9052_GPIO_ODD_SHIFT                   7
  47 #define DA9052_GPIO_EVEN_SHIFT                  3
  48
  49 struct da9052_gpio {
  50         struct da9052 *da9052;
  51         struct gpio_chip gp;
  52 };
  53
  54 static unsigned char da9052_gpio_port_odd(unsigned offset)
  55 {
  56         return offset % 2;
  57 }
  58
  59 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
  60 {
  61         struct da9052_gpio *gpio = gpiochip_get_data(gc);
  62         int da9052_port_direction = 0;
  63         int ret;
  64
  65         ret = da9052_reg_read(gpio->da9052,
  66                               DA9052_GPIO_0_1_REG + (offset >> 1));
  67         if (ret < 0)
  68                 return ret;
  69
  70         if (da9052_gpio_port_odd(offset)) {
  71                 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
  72                 da9052_port_direction >>= 4;
  73         } else {
  74                 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
  75         }
  76
  77         switch (da9052_port_direction) {
  78         case DA9052_INPUT:
  79                 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
  80                         ret = da9052_reg_read(gpio->da9052,
  81                                               DA9052_STATUS_C_REG);
  82                 else
  83                         ret = da9052_reg_read(gpio->da9052,
  84                                               DA9052_STATUS_D_REG);
  85                 if (ret < 0)
  86                         return ret;
  87                 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
  88         case DA9052_OUTPUT_PUSHPULL:
  89                 if (da9052_gpio_port_odd(offset))
  90                         return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
  91                 else
  92                         return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
  93         default:
  94                 return -EINVAL;
  95         }
  96 }
  97
  98 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
  99 {
 100         struct da9052_gpio *gpio = gpiochip_get_data(gc);
 101         int ret;
 102
 103         if (da9052_gpio_port_odd(offset)) {
 104                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 105                                                 DA9052_GPIO_0_1_REG,
 106                                                 DA9052_GPIO_ODD_PORT_MODE,
 107                                                 value << DA9052_GPIO_ODD_SHIFT);
 108                         if (ret != 0)
 109                                 dev_err(gpio->da9052->dev,
 110                                         "Failed to updated gpio odd reg,%d",
 111                                         ret);
 112         } else {
 113                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 114                                                 DA9052_GPIO_0_1_REG,
 115                                                 DA9052_GPIO_EVEN_PORT_MODE,
 116                                                 value << DA9052_GPIO_EVEN_SHIFT);
 117                         if (ret != 0)
 118                                 dev_err(gpio->da9052->dev,
 119                                         "Failed to updated gpio even reg,%d",
 120                                         ret);
 121         }
 122 }
 123
 124 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 125 {
 126         struct da9052_gpio *gpio = gpiochip_get_data(gc);
 127         unsigned char register_value;
 128         int ret;
 129
 130         /* Format: function - 2 bits type - 1 bit mode - 1 bit */
 131         register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
 132                          DA9052_DEBOUNCING_ON << 3;
 133
 134         if (da9052_gpio_port_odd(offset))
 135                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 136                                         DA9052_GPIO_0_1_REG,
 137                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 138                                         (register_value <<
 139                                         DA9052_GPIO_NIBBLE_SHIFT));
 140         else
 141                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 142                                         DA9052_GPIO_0_1_REG,
 143                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 144                                         register_value);
 145
 146         return ret;
 147 }
 148
 149 static int da9052_gpio_direction_output(struct gpio_chip *gc,
 150                                         unsigned offset, int value)
 151 {
 152         struct da9052_gpio *gpio = gpiochip_get_data(gc);
 153         unsigned char register_value;
 154         int ret;
 155
 156         /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
 157         register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
 158                          value << 3;
 159
 160         if (da9052_gpio_port_odd(offset))
 161                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 162                                         DA9052_GPIO_0_1_REG,
 163                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 164                                         (register_value <<
 165                                         DA9052_GPIO_NIBBLE_SHIFT));
 166         else
 167                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 168                                         DA9052_GPIO_0_1_REG,
 169                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 170                                         register_value);
 171
 172         return ret;
 173 }
 174
 175 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
 176 {
 177         struct da9052_gpio *gpio = gpiochip_get_data(gc);
 178         struct da9052 *da9052 = gpio->da9052;
 179
 180         int irq;
 181
 182         irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
 183
 184         return irq;
 185 }
 186
 187 static const struct gpio_chip reference_gp = {
 188         .label = "da9052-gpio",
 189         .owner = THIS_MODULE,
 190         .get = da9052_gpio_get,
 191         .set = da9052_gpio_set,
 192         .direction_input = da9052_gpio_direction_input,
 193         .direction_output = da9052_gpio_direction_output,
 194         .to_irq = da9052_gpio_to_irq,
 195         .can_sleep = true,
 196         .ngpio = 16,
 197         .base = -1,
 198 };
 199
 200 static int da9052_gpio_probe(struct platform_device *pdev)
 201 {
 202         struct da9052_gpio *gpio;
 203         struct da9052_pdata *pdata;
 204         int ret;
 205
 206         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 207         if (!gpio)
 208                 return -ENOMEM;
 209
 210         gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
 211         pdata = dev_get_platdata(gpio->da9052->dev);
 212
 213         gpio->gp = reference_gp;
 214         if (pdata && pdata->gpio_base)
 215                 gpio->gp.base = pdata->gpio_base;
 216
 217         ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
 218         if (ret < 0) {
 219                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 220                 return ret;
 221         }
 222
 223         platform_set_drvdata(pdev, gpio);
 224
 225         return 0;
 226 }
 227
 228 static struct platform_driver da9052_gpio_driver = {
 229         .probe = da9052_gpio_probe,
 230         .driver = {
 231                 .name   = "da9052-gpio",
 232         },
 233 };
 234
 235 module_platform_driver(da9052_gpio_driver);
 236
 237 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 238 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
 239 MODULE_LICENSE("GPL");
 240 MODULE_ALIAS("platform:da9052-gpio");