1 /* 2 * GPIO driver for Analog Devices ADP5520 MFD PMICs 3 * 4 * Copyright 2009 Analog Devices Inc. 5 * 6 * Licensed under the GPL-2 or later. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/slab.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/platform_device.h> 14 #include <linux/mfd/adp5520.h> 15 16 #include <linux/gpio.h> 17 18 struct adp5520_gpio { 19 struct device *master; 20 struct gpio_chip gpio_chip; 21 unsigned char lut[ADP5520_MAXGPIOS]; 22 unsigned long output; 23 }; 24 25 static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off) 26 { 27 struct adp5520_gpio *dev; 28 uint8_t reg_val; 29 30 dev = container_of(chip, struct adp5520_gpio, gpio_chip); 31 32 /* 33 * There are dedicated registers for GPIO IN/OUT. 34 * Make sure we return the right value, even when configured as output 35 */ 36 37 if (test_bit(off, &dev->output)) 38 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val); 39 else 40 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val); 41 42 return !!(reg_val & dev->lut[off]); 43 } 44 45 static void adp5520_gpio_set_value(struct gpio_chip *chip, 46 unsigned off, int val) 47 { 48 struct adp5520_gpio *dev; 49 dev = container_of(chip, struct adp5520_gpio, gpio_chip); 50 51 if (val) 52 adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); 53 else 54 adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, 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 = container_of(chip, struct adp5520_gpio, gpio_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 = container_of(chip, struct adp5520_gpio, gpio_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 = pdev->dev.platform_data; 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 dev_err(&pdev->dev, "failed to alloc memory\n"); 111 return -ENOMEM; 112 } 113 114 dev->master = pdev->dev.parent; 115 116 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) 117 if (pdata->gpio_en_mask & (1 << i)) 118 dev->lut[gpios++] = 1 << i; 119 120 if (gpios < 1) { 121 ret = -EINVAL; 122 goto err; 123 } 124 125 gc = &dev->gpio_chip; 126 gc->direction_input = adp5520_gpio_direction_input; 127 gc->direction_output = adp5520_gpio_direction_output; 128 gc->get = adp5520_gpio_get_value; 129 gc->set = adp5520_gpio_set_value; 130 gc->can_sleep = 1; 131 132 gc->base = pdata->gpio_start; 133 gc->ngpio = gpios; 134 gc->label = pdev->name; 135 gc->owner = THIS_MODULE; 136 137 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1, 138 pdata->gpio_en_mask); 139 140 if (pdata->gpio_en_mask & ADP5520_GPIO_C3) 141 ctl_mask |= ADP5520_C3_MODE; 142 143 if (pdata->gpio_en_mask & ADP5520_GPIO_R3) 144 ctl_mask |= ADP5520_R3_MODE; 145 146 if (ctl_mask) 147 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, 148 ctl_mask); 149 150 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, 151 pdata->gpio_pullup_mask); 152 153 if (ret) { 154 dev_err(&pdev->dev, "failed to write\n"); 155 goto err; 156 } 157 158 ret = gpiochip_add(&dev->gpio_chip); 159 if (ret) 160 goto err; 161 162 platform_set_drvdata(pdev, dev); 163 return 0; 164 165 err: 166 return ret; 167 } 168 169 static int adp5520_gpio_remove(struct platform_device *pdev) 170 { 171 struct adp5520_gpio *dev; 172 int ret; 173 174 dev = platform_get_drvdata(pdev); 175 ret = gpiochip_remove(&dev->gpio_chip); 176 if (ret) { 177 dev_err(&pdev->dev, "%s failed, %d\n", 178 "gpiochip_remove()", ret); 179 return ret; 180 } 181 182 return 0; 183 } 184 185 static struct platform_driver adp5520_gpio_driver = { 186 .driver = { 187 .name = "adp5520-gpio", 188 .owner = THIS_MODULE, 189 }, 190 .probe = adp5520_gpio_probe, 191 .remove = adp5520_gpio_remove, 192 }; 193 194 module_platform_driver(adp5520_gpio_driver); 195 196 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 197 MODULE_DESCRIPTION("GPIO ADP5520 Driver"); 198 MODULE_LICENSE("GPL"); 199 MODULE_ALIAS("platform:adp5520-gpio"); 200