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 int adp5520_gpio_set_value(struct gpio_chip *chip, 44 unsigned int off, int val) 45 { 46 struct adp5520_gpio *dev; 47 dev = gpiochip_get_data(chip); 48 49 if (val) 50 return adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, 51 dev->lut[off]); 52 else 53 return adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, 54 dev->lut[off]); 55 } 56 57 static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off) 58 { 59 struct adp5520_gpio *dev; 60 dev = gpiochip_get_data(chip); 61 62 clear_bit(off, &dev->output); 63 64 return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2, 65 dev->lut[off]); 66 } 67 68 static int adp5520_gpio_direction_output(struct gpio_chip *chip, 69 unsigned off, int val) 70 { 71 struct adp5520_gpio *dev; 72 int ret = 0; 73 dev = gpiochip_get_data(chip); 74 75 set_bit(off, &dev->output); 76 77 if (val) 78 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, 79 dev->lut[off]); 80 else 81 ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, 82 dev->lut[off]); 83 84 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2, 85 dev->lut[off]); 86 87 return ret; 88 } 89 90 static int adp5520_gpio_probe(struct platform_device *pdev) 91 { 92 struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); 93 struct adp5520_gpio *dev; 94 struct gpio_chip *gc; 95 int ret, i, gpios; 96 unsigned char ctl_mask = 0; 97 98 if (pdata == NULL) { 99 dev_err(&pdev->dev, "missing platform data\n"); 100 return -ENODEV; 101 } 102 103 if (pdev->id != ID_ADP5520) { 104 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n"); 105 return -ENODEV; 106 } 107 108 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 109 if (dev == NULL) 110 return -ENOMEM; 111 112 dev->master = pdev->dev.parent; 113 114 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) 115 if (pdata->gpio_en_mask & (1 << i)) 116 dev->lut[gpios++] = 1 << i; 117 118 if (gpios < 1) 119 return -EINVAL; 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_rv = 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 return ret; 152 } 153 154 return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev); 155 } 156 157 static struct platform_driver adp5520_gpio_driver = { 158 .driver = { 159 .name = "adp5520-gpio", 160 }, 161 .probe = adp5520_gpio_probe, 162 }; 163 164 module_platform_driver(adp5520_gpio_driver); 165 166 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 167 MODULE_DESCRIPTION("GPIO ADP5520 Driver"); 168 MODULE_LICENSE("GPL"); 169 MODULE_ALIAS("platform:adp5520-gpio"); 170