Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ |
| 3 | * Keerthy <j-keerthy@ti.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 10 | * kind, whether expressed or implied; without even the implied warranty |
| 11 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License version 2 for more details. |
| 13 | * |
| 14 | * Based on the TPS65218 driver |
| 15 | */ |
| 16 | |
| 17 | #include <linux/gpio.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/regmap.h> |
| 21 | |
| 22 | #include <linux/mfd/lp873x.h> |
| 23 | |
| 24 | #define BITS_PER_GPO 0x4 |
| 25 | #define LP873X_GPO_CTRL_OD 0x2 |
| 26 | |
| 27 | struct lp873x_gpio { |
| 28 | struct gpio_chip chip; |
| 29 | struct lp873x *lp873; |
| 30 | }; |
| 31 | |
| 32 | static int lp873x_gpio_get_direction(struct gpio_chip *chip, |
| 33 | unsigned int offset) |
| 34 | { |
| 35 | /* This device is output only */ |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | static int lp873x_gpio_direction_input(struct gpio_chip *chip, |
| 40 | unsigned int offset) |
| 41 | { |
| 42 | /* This device is output only */ |
| 43 | return -EINVAL; |
| 44 | } |
| 45 | |
| 46 | static int lp873x_gpio_direction_output(struct gpio_chip *chip, |
| 47 | unsigned int offset, int value) |
| 48 | { |
| 49 | struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
| 50 | |
| 51 | /* Set the initial value */ |
| 52 | return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, |
| 53 | BIT(offset * BITS_PER_GPO), |
| 54 | value ? BIT(offset * BITS_PER_GPO) : 0); |
| 55 | } |
| 56 | |
| 57 | static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset) |
| 58 | { |
| 59 | struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
| 60 | int ret, val; |
| 61 | |
| 62 | ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val); |
| 63 | if (ret < 0) |
| 64 | return ret; |
| 65 | |
| 66 | return val & BIT(offset * BITS_PER_GPO); |
| 67 | } |
| 68 | |
| 69 | static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset, |
| 70 | int value) |
| 71 | { |
| 72 | struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
| 73 | |
| 74 | regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, |
| 75 | BIT(offset * BITS_PER_GPO), |
| 76 | value ? BIT(offset * BITS_PER_GPO) : 0); |
| 77 | } |
| 78 | |
| 79 | static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset) |
| 80 | { |
| 81 | struct lp873x_gpio *gpio = gpiochip_get_data(gc); |
| 82 | int ret; |
| 83 | |
| 84 | switch (offset) { |
| 85 | case 0: |
| 86 | /* No MUX Set up Needed for GPO */ |
| 87 | break; |
| 88 | case 1: |
| 89 | /* Setup the CLKIN_PIN_SEL MUX to GPO2 */ |
| 90 | ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG, |
| 91 | LP873X_CONFIG_CLKIN_PIN_SEL, 0); |
| 92 | if (ret) |
| 93 | return ret; |
| 94 | |
| 95 | break; |
| 96 | default: |
| 97 | return -EINVAL; |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 103 | static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset, |
| 104 | unsigned long config) |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 105 | { |
| 106 | struct lp873x_gpio *gpio = gpiochip_get_data(gc); |
| 107 | |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 108 | switch (pinconf_to_config_param(config)) { |
| 109 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 110 | return regmap_update_bits(gpio->lp873->regmap, |
| 111 | LP873X_REG_GPO_CTRL, |
| 112 | BIT(offset * BITS_PER_GPO + |
| 113 | LP873X_GPO_CTRL_OD), |
| 114 | BIT(offset * BITS_PER_GPO + |
| 115 | LP873X_GPO_CTRL_OD)); |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 116 | |
| 117 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 118 | return regmap_update_bits(gpio->lp873->regmap, |
| 119 | LP873X_REG_GPO_CTRL, |
| 120 | BIT(offset * BITS_PER_GPO + |
| 121 | LP873X_GPO_CTRL_OD), 0); |
| 122 | default: |
| 123 | return -ENOTSUPP; |
| 124 | } |
| 125 | } |
| 126 | |
Julia Lawall | e35b5ab | 2016-09-11 14:14:37 +0200 | [diff] [blame] | 127 | static const struct gpio_chip template_chip = { |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 128 | .label = "lp873x-gpio", |
| 129 | .owner = THIS_MODULE, |
| 130 | .request = lp873x_gpio_request, |
| 131 | .get_direction = lp873x_gpio_get_direction, |
| 132 | .direction_input = lp873x_gpio_direction_input, |
| 133 | .direction_output = lp873x_gpio_direction_output, |
| 134 | .get = lp873x_gpio_get, |
| 135 | .set = lp873x_gpio_set, |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 136 | .set_config = lp873x_gpio_set_config, |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 137 | .base = -1, |
| 138 | .ngpio = 2, |
| 139 | .can_sleep = true, |
| 140 | }; |
| 141 | |
| 142 | static int lp873x_gpio_probe(struct platform_device *pdev) |
| 143 | { |
| 144 | struct lp873x_gpio *gpio; |
| 145 | int ret; |
| 146 | |
| 147 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
| 148 | if (!gpio) |
| 149 | return -ENOMEM; |
| 150 | |
| 151 | platform_set_drvdata(pdev, gpio); |
| 152 | |
| 153 | gpio->lp873 = dev_get_drvdata(pdev->dev.parent); |
| 154 | gpio->chip = template_chip; |
| 155 | gpio->chip.parent = gpio->lp873->dev; |
| 156 | |
Wei Yongjun | 9d99c41 | 2016-09-10 12:04:42 +0000 | [diff] [blame] | 157 | ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 158 | if (ret < 0) { |
| 159 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
| 160 | return ret; |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 166 | static const struct platform_device_id lp873x_gpio_id_table[] = { |
| 167 | { "lp873x-gpio", }, |
| 168 | { /* sentinel */ } |
| 169 | }; |
| 170 | MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table); |
| 171 | |
| 172 | static struct platform_driver lp873x_gpio_driver = { |
| 173 | .driver = { |
| 174 | .name = "lp873x-gpio", |
| 175 | }, |
| 176 | .probe = lp873x_gpio_probe, |
Keerthy | 83f1410 | 2016-08-31 14:28:11 +0530 | [diff] [blame] | 177 | .id_table = lp873x_gpio_id_table, |
| 178 | }; |
| 179 | module_platform_driver(lp873x_gpio_driver); |
| 180 | |
| 181 | MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>"); |
| 182 | MODULE_DESCRIPTION("LP873X GPIO driver"); |
| 183 | MODULE_LICENSE("GPL v2"); |