1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO driver for Analog Devices ADP5520 MFD PMICs 4 * 5 * Copyright 2009 Analog Devices Inc. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/slab.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/platform_device.h> 13 #include <linux/mfd/adp5520.h> 14 #include <linux/gpio/driver.h> 15 16 struct adp5520_gpio { 17 struct device *master; 18 struct gpio_chip gpio_chip; 19 unsigned char lut[ADP5520_MAXGPIOS]; 20 unsigned long output; 21 }; 22 23 static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off) 24 { 25 struct adp5520_gpio *dev; 26 uint8_t reg_val; 27 28 dev = gpiochip_get_data(chip); 29 30 /* 31 * There are dedicated registers for GPIO IN/OUT. 32 * Make sure we return the right value, even when configured as output 33 */ 34 35 if (test_bit(off, &dev->output)) 36 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val); 37 else 38 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val); 39 40 return !!(reg_val & dev->lut[off]); 41 } 42 43 static void adp5520_gpio_set_value(struct gpio_chip *chip, 44 unsigned off, int val) 45 { 46 struct adp5520_gpio *dev; 47 dev = gpiochip_get_data(chip); 48 49 if (val) 50 adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); 51 else 52 adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); 53 } 54 55 static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off) 56 { 57 struct adp5520_gpio *dev; 58 dev = gpiochip_get_data(chip); 59 60 clear_bit(off, &dev->output); 61 62 return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2, 63 dev->lut[off]); 64 } 65 66 static int adp5520_gpio_direction_output(struct gpio_chip *chip, 67 unsigned off, int val) 68 { 69 struct adp5520_gpio *dev; 70 int ret = 0; 71 dev = gpiochip_get_data(chip); 72 73 set_bit(off, &dev->output); 74 75 if (val) 76 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, 77 dev->lut[off]); 78 else 79 ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, 80 dev->lut[off]); 81 82 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2, 83 dev->lut[off]); 84 85 return ret; 86 } 87 88 static int adp5520_gpio_probe(struct platform_device *pdev) 89 { 90 struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); 91 struct adp5520_gpio *dev; 92 struct gpio_chip *gc; 93 int ret, i, gpios; 94 unsigned char ctl_mask = 0; 95 96 if (pdata == NULL) { 97 dev_err(&pdev->dev, "missing platform data\n"); 98 return -ENODEV; 99 } 100 101 if (pdev->id != ID_ADP5520) { 102 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n"); 103 return -ENODEV; 104 } 105 106 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 107 if (dev == NULL) 108 return -ENOMEM; 109 110 dev->master = pdev->dev.parent; 111 112 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) 113 if (pdata->gpio_en_mask & (1 << i)) 114 dev->lut[gpios++] = 1 << i; 115 116 if (gpios < 1) { 117 ret = -EINVAL; 118 goto err; 119 } 120 121 gc = &dev->gpio_chip; 122 gc->direction_input = adp5520_gpio_direction_input; 123 gc->direction_output = adp5520_gpio_direction_output; 124 gc->get = adp5520_gpio_get_value; 125 gc->set = adp5520_gpio_set_value; 126 gc->can_sleep = true; 127 128 gc->base = pdata->gpio_start; 129 gc->ngpio = gpios; 130 gc->label = pdev->name; 131 gc->owner = THIS_MODULE; 132 133 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1, 134 pdata->gpio_en_mask); 135 136 if (pdata->gpio_en_mask & ADP5520_GPIO_C3) 137 ctl_mask |= ADP5520_C3_MODE; 138 139 if (pdata->gpio_en_mask & ADP5520_GPIO_R3) 140 ctl_mask |= ADP5520_R3_MODE; 141 142 if (ctl_mask) 143 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, 144 ctl_mask); 145 146 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, 147 pdata->gpio_pullup_mask); 148 149 if (ret) { 150 dev_err(&pdev->dev, "failed to write\n"); 151 goto err; 152 } 153 154 ret = devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev); 155 if (ret) 156 goto err; 157 158 platform_set_drvdata(pdev, dev); 159 return 0; 160 161 err: 162 return ret; 163 } 164 165 static struct platform_driver adp5520_gpio_driver = { 166 .driver = { 167 .name = "adp5520-gpio", 168 }, 169 .probe = adp5520_gpio_probe, 170 }; 171 172 module_platform_driver(adp5520_gpio_driver); 173 174 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 175 MODULE_DESCRIPTION("GPIO ADP5520 Driver"); 176 MODULE_LICENSE("GPL"); 177 MODULE_ALIAS("platform:adp5520-gpio"); 178