1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO Driver for Dialog DA9052 PMICs. 4 * 5 * Copyright(c) 2011 Dialog Semiconductor Ltd. 6 * 7 * Author: David Dajun Chen <dchen@diasemi.com> 8 */ 9 #include <linux/fs.h> 10 #include <linux/gpio/driver.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/syscalls.h> 14 #include <linux/uaccess.h> 15 16 #include <linux/mfd/da9052/da9052.h> 17 #include <linux/mfd/da9052/pdata.h> 18 #include <linux/mfd/da9052/reg.h> 19 20 #define DA9052_INPUT 1 21 #define DA9052_OUTPUT_OPENDRAIN 2 22 #define DA9052_OUTPUT_PUSHPULL 3 23 24 #define DA9052_SUPPLY_VDD_IO1 0 25 26 #define DA9052_DEBOUNCING_OFF 0 27 #define DA9052_DEBOUNCING_ON 1 28 29 #define DA9052_OUTPUT_LOWLEVEL 0 30 31 #define DA9052_ACTIVE_LOW 0 32 #define DA9052_ACTIVE_HIGH 1 33 34 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8 35 #define DA9052_GPIO_SHIFT_COUNT(no) (no%8) 36 #define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0 37 #define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F 38 #define DA9052_GPIO_NIBBLE_SHIFT 4 39 #define DA9052_IRQ_GPI0 16 40 #define DA9052_GPIO_ODD_SHIFT 7 41 #define DA9052_GPIO_EVEN_SHIFT 3 42 43 struct da9052_gpio { 44 struct da9052 *da9052; 45 struct gpio_chip gp; 46 }; 47 48 static unsigned char da9052_gpio_port_odd(unsigned offset) 49 { 50 return offset % 2; 51 } 52 53 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) 54 { 55 struct da9052_gpio *gpio = gpiochip_get_data(gc); 56 int da9052_port_direction = 0; 57 int ret; 58 59 ret = da9052_reg_read(gpio->da9052, 60 DA9052_GPIO_0_1_REG + (offset >> 1)); 61 if (ret < 0) 62 return ret; 63 64 if (da9052_gpio_port_odd(offset)) { 65 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; 66 da9052_port_direction >>= 4; 67 } else { 68 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; 69 } 70 71 switch (da9052_port_direction) { 72 case DA9052_INPUT: 73 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) 74 ret = da9052_reg_read(gpio->da9052, 75 DA9052_STATUS_C_REG); 76 else 77 ret = da9052_reg_read(gpio->da9052, 78 DA9052_STATUS_D_REG); 79 if (ret < 0) 80 return ret; 81 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))); 82 case DA9052_OUTPUT_PUSHPULL: 83 if (da9052_gpio_port_odd(offset)) 84 return !!(ret & DA9052_GPIO_ODD_PORT_MODE); 85 else 86 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE); 87 default: 88 return -EINVAL; 89 } 90 } 91 92 static int da9052_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) 93 { 94 struct da9052_gpio *gpio = gpiochip_get_data(gc); 95 96 if (da9052_gpio_port_odd(offset)) 97 return da9052_reg_update(gpio->da9052, (offset >> 1) + 98 DA9052_GPIO_0_1_REG, 99 DA9052_GPIO_ODD_PORT_MODE, 100 value << DA9052_GPIO_ODD_SHIFT); 101 102 return da9052_reg_update(gpio->da9052, 103 (offset >> 1) + DA9052_GPIO_0_1_REG, 104 DA9052_GPIO_EVEN_PORT_MODE, 105 value << DA9052_GPIO_EVEN_SHIFT); 106 } 107 108 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 109 { 110 struct da9052_gpio *gpio = gpiochip_get_data(gc); 111 unsigned char register_value; 112 int ret; 113 114 /* Format: function - 2 bits type - 1 bit mode - 1 bit */ 115 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | 116 DA9052_DEBOUNCING_ON << 3; 117 118 if (da9052_gpio_port_odd(offset)) 119 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 120 DA9052_GPIO_0_1_REG, 121 DA9052_GPIO_MASK_UPPER_NIBBLE, 122 (register_value << 123 DA9052_GPIO_NIBBLE_SHIFT)); 124 else 125 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 126 DA9052_GPIO_0_1_REG, 127 DA9052_GPIO_MASK_LOWER_NIBBLE, 128 register_value); 129 130 return ret; 131 } 132 133 static int da9052_gpio_direction_output(struct gpio_chip *gc, 134 unsigned offset, int value) 135 { 136 struct da9052_gpio *gpio = gpiochip_get_data(gc); 137 unsigned char register_value; 138 int ret; 139 140 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ 141 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | 142 value << 3; 143 144 if (da9052_gpio_port_odd(offset)) 145 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 146 DA9052_GPIO_0_1_REG, 147 DA9052_GPIO_MASK_UPPER_NIBBLE, 148 (register_value << 149 DA9052_GPIO_NIBBLE_SHIFT)); 150 else 151 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 152 DA9052_GPIO_0_1_REG, 153 DA9052_GPIO_MASK_LOWER_NIBBLE, 154 register_value); 155 156 return ret; 157 } 158 159 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) 160 { 161 struct da9052_gpio *gpio = gpiochip_get_data(gc); 162 struct da9052 *da9052 = gpio->da9052; 163 164 int irq; 165 166 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); 167 168 return irq; 169 } 170 171 static const struct gpio_chip reference_gp = { 172 .label = "da9052-gpio", 173 .owner = THIS_MODULE, 174 .get = da9052_gpio_get, 175 .set_rv = da9052_gpio_set, 176 .direction_input = da9052_gpio_direction_input, 177 .direction_output = da9052_gpio_direction_output, 178 .to_irq = da9052_gpio_to_irq, 179 .can_sleep = true, 180 .ngpio = 16, 181 .base = -1, 182 }; 183 184 static int da9052_gpio_probe(struct platform_device *pdev) 185 { 186 struct da9052_gpio *gpio; 187 struct da9052_pdata *pdata; 188 189 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 190 if (!gpio) 191 return -ENOMEM; 192 193 gpio->da9052 = dev_get_drvdata(pdev->dev.parent); 194 pdata = dev_get_platdata(gpio->da9052->dev); 195 196 gpio->gp = reference_gp; 197 if (pdata && pdata->gpio_base) 198 gpio->gp.base = pdata->gpio_base; 199 200 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 201 } 202 203 static struct platform_driver da9052_gpio_driver = { 204 .probe = da9052_gpio_probe, 205 .driver = { 206 .name = "da9052-gpio", 207 }, 208 }; 209 210 module_platform_driver(da9052_gpio_driver); 211 212 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 213 MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); 214 MODULE_LICENSE("GPL"); 215 MODULE_ALIAS("platform:da9052-gpio"); 216