Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 1 | /* |
| 2 | * gpiolib support for Wolfson Arizona class devices |
| 3 | * |
| 4 | * Copyright 2012 Wolfson Microelectronics PLC. |
| 5 | * |
| 6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.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 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/gpio.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/seq_file.h> |
| 21 | |
| 22 | #include <linux/mfd/arizona/core.h> |
| 23 | #include <linux/mfd/arizona/pdata.h> |
| 24 | #include <linux/mfd/arizona/registers.h> |
| 25 | |
| 26 | struct arizona_gpio { |
| 27 | struct arizona *arizona; |
| 28 | struct gpio_chip gpio_chip; |
| 29 | }; |
| 30 | |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 31 | static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
| 32 | { |
Linus Walleij | 18992d4 | 2015-12-04 15:31:31 +0100 | [diff] [blame] | 33 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 34 | struct arizona *arizona = arizona_gpio->arizona; |
| 35 | |
| 36 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 37 | ARIZONA_GPN_DIR, ARIZONA_GPN_DIR); |
| 38 | } |
| 39 | |
| 40 | static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 41 | { |
Linus Walleij | 18992d4 | 2015-12-04 15:31:31 +0100 | [diff] [blame] | 42 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 43 | struct arizona *arizona = arizona_gpio->arizona; |
| 44 | unsigned int val; |
| 45 | int ret; |
| 46 | |
| 47 | ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val); |
| 48 | if (ret < 0) |
| 49 | return ret; |
| 50 | |
| 51 | if (val & ARIZONA_GPN_LVL) |
| 52 | return 1; |
| 53 | else |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static int arizona_gpio_direction_out(struct gpio_chip *chip, |
| 58 | unsigned offset, int value) |
| 59 | { |
Linus Walleij | 18992d4 | 2015-12-04 15:31:31 +0100 | [diff] [blame] | 60 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 61 | struct arizona *arizona = arizona_gpio->arizona; |
| 62 | |
| 63 | if (value) |
| 64 | value = ARIZONA_GPN_LVL; |
| 65 | |
| 66 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 67 | ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value); |
| 68 | } |
| 69 | |
| 70 | static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 71 | { |
Linus Walleij | 18992d4 | 2015-12-04 15:31:31 +0100 | [diff] [blame] | 72 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 73 | struct arizona *arizona = arizona_gpio->arizona; |
| 74 | |
| 75 | if (value) |
| 76 | value = ARIZONA_GPN_LVL; |
| 77 | |
| 78 | regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 79 | ARIZONA_GPN_LVL, value); |
| 80 | } |
| 81 | |
| 82 | static struct gpio_chip template_chip = { |
| 83 | .label = "arizona", |
| 84 | .owner = THIS_MODULE, |
| 85 | .direction_input = arizona_gpio_direction_in, |
| 86 | .get = arizona_gpio_get, |
| 87 | .direction_output = arizona_gpio_direction_out, |
| 88 | .set = arizona_gpio_set, |
Linus Walleij | 9fb1f39 | 2013-12-04 14:42:46 +0100 | [diff] [blame] | 89 | .can_sleep = true, |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 90 | }; |
| 91 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 92 | static int arizona_gpio_probe(struct platform_device *pdev) |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 93 | { |
| 94 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); |
Jingoo Han | e56aee1 | 2013-07-30 17:08:05 +0900 | [diff] [blame] | 95 | struct arizona_pdata *pdata = dev_get_platdata(arizona->dev); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 96 | struct arizona_gpio *arizona_gpio; |
| 97 | int ret; |
| 98 | |
| 99 | arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio), |
| 100 | GFP_KERNEL); |
Varka Bhadram | afeb7b4 | 2015-03-31 09:49:11 +0530 | [diff] [blame] | 101 | if (!arizona_gpio) |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 102 | return -ENOMEM; |
| 103 | |
| 104 | arizona_gpio->arizona = arizona; |
| 105 | arizona_gpio->gpio_chip = template_chip; |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 106 | arizona_gpio->gpio_chip.parent = &pdev->dev; |
Charles Keepax | 4bbd6f2 | 2013-09-29 21:00:37 +0100 | [diff] [blame] | 107 | #ifdef CONFIG_OF_GPIO |
| 108 | arizona_gpio->gpio_chip.of_node = arizona->dev->of_node; |
| 109 | #endif |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 110 | |
| 111 | switch (arizona->type) { |
| 112 | case WM5102: |
| 113 | case WM5110: |
Richard Fitzgerald | 449c175 | 2015-01-17 15:21:25 +0000 | [diff] [blame] | 114 | case WM8280: |
Charles Keepax | d9cadcc | 2013-09-11 14:03:27 +0100 | [diff] [blame] | 115 | case WM8997: |
Richard Fitzgerald | 633a506 | 2015-09-10 16:59:01 +0100 | [diff] [blame] | 116 | case WM8998: |
| 117 | case WM1814: |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 118 | arizona_gpio->gpio_chip.ngpio = 5; |
| 119 | break; |
Richard Fitzgerald | 7d07d15 | 2015-11-03 15:08:34 +0000 | [diff] [blame] | 120 | case WM1831: |
| 121 | case CS47L24: |
| 122 | arizona_gpio->gpio_chip.ngpio = 2; |
| 123 | break; |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 124 | default: |
| 125 | dev_err(&pdev->dev, "Unknown chip variant %d\n", |
| 126 | arizona->type); |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | |
| 130 | if (pdata && pdata->gpio_base) |
| 131 | arizona_gpio->gpio_chip.base = pdata->gpio_base; |
| 132 | else |
| 133 | arizona_gpio->gpio_chip.base = -1; |
| 134 | |
Linus Walleij | 18992d4 | 2015-12-04 15:31:31 +0100 | [diff] [blame] | 135 | ret = gpiochip_add_data(&arizona_gpio->gpio_chip, arizona_gpio); |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 136 | if (ret < 0) { |
| 137 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", |
| 138 | ret); |
| 139 | goto err; |
| 140 | } |
| 141 | |
| 142 | platform_set_drvdata(pdev, arizona_gpio); |
| 143 | |
| 144 | return ret; |
| 145 | |
| 146 | err: |
| 147 | return ret; |
| 148 | } |
| 149 | |
Bill Pemberton | 206210c | 2012-11-19 13:25:50 -0500 | [diff] [blame] | 150 | static int arizona_gpio_remove(struct platform_device *pdev) |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 151 | { |
| 152 | struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev); |
| 153 | |
abdoulaye berthe | 9f5132a | 2014-07-12 22:30:12 +0200 | [diff] [blame] | 154 | gpiochip_remove(&arizona_gpio->gpio_chip); |
| 155 | return 0; |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | static struct platform_driver arizona_gpio_driver = { |
| 159 | .driver.name = "arizona-gpio", |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 160 | .probe = arizona_gpio_probe, |
Bill Pemberton | 8283c4f | 2012-11-19 13:20:08 -0500 | [diff] [blame] | 161 | .remove = arizona_gpio_remove, |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 162 | }; |
| 163 | |
| 164 | module_platform_driver(arizona_gpio_driver); |
| 165 | |
| 166 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 167 | MODULE_DESCRIPTION("GPIO interface for Arizona devices"); |
| 168 | MODULE_LICENSE("GPL"); |
| 169 | MODULE_ALIAS("platform:arizona-gpio"); |