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 void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 93 { 94 struct da9052_gpio *gpio = gpiochip_get_data(gc); 95 int ret; 96 97 if (da9052_gpio_port_odd(offset)) { 98 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 99 DA9052_GPIO_0_1_REG, 100 DA9052_GPIO_ODD_PORT_MODE, 101 value << DA9052_GPIO_ODD_SHIFT); 102 if (ret != 0) 103 dev_err(gpio->da9052->dev, 104 "Failed to updated gpio odd reg,%d", 105 ret); 106 } else { 107 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 108 DA9052_GPIO_0_1_REG, 109 DA9052_GPIO_EVEN_PORT_MODE, 110 value << DA9052_GPIO_EVEN_SHIFT); 111 if (ret != 0) 112 dev_err(gpio->da9052->dev, 113 "Failed to updated gpio even reg,%d", 114 ret); 115 } 116 } 117 118 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 119 { 120 struct da9052_gpio *gpio = gpiochip_get_data(gc); 121 unsigned char register_value; 122 int ret; 123 124 /* Format: function - 2 bits type - 1 bit mode - 1 bit */ 125 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | 126 DA9052_DEBOUNCING_ON << 3; 127 128 if (da9052_gpio_port_odd(offset)) 129 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 130 DA9052_GPIO_0_1_REG, 131 DA9052_GPIO_MASK_UPPER_NIBBLE, 132 (register_value << 133 DA9052_GPIO_NIBBLE_SHIFT)); 134 else 135 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 136 DA9052_GPIO_0_1_REG, 137 DA9052_GPIO_MASK_LOWER_NIBBLE, 138 register_value); 139 140 return ret; 141 } 142 143 static int da9052_gpio_direction_output(struct gpio_chip *gc, 144 unsigned offset, int value) 145 { 146 struct da9052_gpio *gpio = gpiochip_get_data(gc); 147 unsigned char register_value; 148 int ret; 149 150 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ 151 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | 152 value << 3; 153 154 if (da9052_gpio_port_odd(offset)) 155 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 156 DA9052_GPIO_0_1_REG, 157 DA9052_GPIO_MASK_UPPER_NIBBLE, 158 (register_value << 159 DA9052_GPIO_NIBBLE_SHIFT)); 160 else 161 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 162 DA9052_GPIO_0_1_REG, 163 DA9052_GPIO_MASK_LOWER_NIBBLE, 164 register_value); 165 166 return ret; 167 } 168 169 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) 170 { 171 struct da9052_gpio *gpio = gpiochip_get_data(gc); 172 struct da9052 *da9052 = gpio->da9052; 173 174 int irq; 175 176 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); 177 178 return irq; 179 } 180 181 static const struct gpio_chip reference_gp = { 182 .label = "da9052-gpio", 183 .owner = THIS_MODULE, 184 .get = da9052_gpio_get, 185 .set = da9052_gpio_set, 186 .direction_input = da9052_gpio_direction_input, 187 .direction_output = da9052_gpio_direction_output, 188 .to_irq = da9052_gpio_to_irq, 189 .can_sleep = true, 190 .ngpio = 16, 191 .base = -1, 192 }; 193 194 static int da9052_gpio_probe(struct platform_device *pdev) 195 { 196 struct da9052_gpio *gpio; 197 struct da9052_pdata *pdata; 198 199 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 200 if (!gpio) 201 return -ENOMEM; 202 203 gpio->da9052 = dev_get_drvdata(pdev->dev.parent); 204 pdata = dev_get_platdata(gpio->da9052->dev); 205 206 gpio->gp = reference_gp; 207 if (pdata && pdata->gpio_base) 208 gpio->gp.base = pdata->gpio_base; 209 210 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 211 } 212 213 static struct platform_driver da9052_gpio_driver = { 214 .probe = da9052_gpio_probe, 215 .driver = { 216 .name = "da9052-gpio", 217 }, 218 }; 219 220 module_platform_driver(da9052_gpio_driver); 221 222 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 223 MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); 224 MODULE_LICENSE("GPL"); 225 MODULE_ALIAS("platform:da9052-gpio"); 226