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/module.h> 10 #include <linux/fs.h> 11 #include <linux/uaccess.h> 12 #include <linux/platform_device.h> 13 #include <linux/gpio/driver.h> 14 #include <linux/syscalls.h> 15 #include <linux/seq_file.h> 16 17 #include <linux/mfd/da9052/da9052.h> 18 #include <linux/mfd/da9052/reg.h> 19 #include <linux/mfd/da9052/pdata.h> 20 21 #define DA9052_INPUT 1 22 #define DA9052_OUTPUT_OPENDRAIN 2 23 #define DA9052_OUTPUT_PUSHPULL 3 24 25 #define DA9052_SUPPLY_VDD_IO1 0 26 27 #define DA9052_DEBOUNCING_OFF 0 28 #define DA9052_DEBOUNCING_ON 1 29 30 #define DA9052_OUTPUT_LOWLEVEL 0 31 32 #define DA9052_ACTIVE_LOW 0 33 #define DA9052_ACTIVE_HIGH 1 34 35 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8 36 #define DA9052_GPIO_SHIFT_COUNT(no) (no%8) 37 #define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0 38 #define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F 39 #define DA9052_GPIO_NIBBLE_SHIFT 4 40 #define DA9052_IRQ_GPI0 16 41 #define DA9052_GPIO_ODD_SHIFT 7 42 #define DA9052_GPIO_EVEN_SHIFT 3 43 44 struct da9052_gpio { 45 struct da9052 *da9052; 46 struct gpio_chip gp; 47 }; 48 49 static unsigned char da9052_gpio_port_odd(unsigned offset) 50 { 51 return offset % 2; 52 } 53 54 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) 55 { 56 struct da9052_gpio *gpio = gpiochip_get_data(gc); 57 int da9052_port_direction = 0; 58 int ret; 59 60 ret = da9052_reg_read(gpio->da9052, 61 DA9052_GPIO_0_1_REG + (offset >> 1)); 62 if (ret < 0) 63 return ret; 64 65 if (da9052_gpio_port_odd(offset)) { 66 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; 67 da9052_port_direction >>= 4; 68 } else { 69 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; 70 } 71 72 switch (da9052_port_direction) { 73 case DA9052_INPUT: 74 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) 75 ret = da9052_reg_read(gpio->da9052, 76 DA9052_STATUS_C_REG); 77 else 78 ret = da9052_reg_read(gpio->da9052, 79 DA9052_STATUS_D_REG); 80 if (ret < 0) 81 return ret; 82 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))); 83 case DA9052_OUTPUT_PUSHPULL: 84 if (da9052_gpio_port_odd(offset)) 85 return !!(ret & DA9052_GPIO_ODD_PORT_MODE); 86 else 87 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE); 88 default: 89 return -EINVAL; 90 } 91 } 92 93 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 94 { 95 struct da9052_gpio *gpio = gpiochip_get_data(gc); 96 int ret; 97 98 if (da9052_gpio_port_odd(offset)) { 99 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 100 DA9052_GPIO_0_1_REG, 101 DA9052_GPIO_ODD_PORT_MODE, 102 value << DA9052_GPIO_ODD_SHIFT); 103 if (ret != 0) 104 dev_err(gpio->da9052->dev, 105 "Failed to updated gpio odd reg,%d", 106 ret); 107 } else { 108 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 109 DA9052_GPIO_0_1_REG, 110 DA9052_GPIO_EVEN_PORT_MODE, 111 value << DA9052_GPIO_EVEN_SHIFT); 112 if (ret != 0) 113 dev_err(gpio->da9052->dev, 114 "Failed to updated gpio even reg,%d", 115 ret); 116 } 117 } 118 119 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 120 { 121 struct da9052_gpio *gpio = gpiochip_get_data(gc); 122 unsigned char register_value; 123 int ret; 124 125 /* Format: function - 2 bits type - 1 bit mode - 1 bit */ 126 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | 127 DA9052_DEBOUNCING_ON << 3; 128 129 if (da9052_gpio_port_odd(offset)) 130 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 131 DA9052_GPIO_0_1_REG, 132 DA9052_GPIO_MASK_UPPER_NIBBLE, 133 (register_value << 134 DA9052_GPIO_NIBBLE_SHIFT)); 135 else 136 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 137 DA9052_GPIO_0_1_REG, 138 DA9052_GPIO_MASK_LOWER_NIBBLE, 139 register_value); 140 141 return ret; 142 } 143 144 static int da9052_gpio_direction_output(struct gpio_chip *gc, 145 unsigned offset, int value) 146 { 147 struct da9052_gpio *gpio = gpiochip_get_data(gc); 148 unsigned char register_value; 149 int ret; 150 151 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ 152 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | 153 value << 3; 154 155 if (da9052_gpio_port_odd(offset)) 156 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 157 DA9052_GPIO_0_1_REG, 158 DA9052_GPIO_MASK_UPPER_NIBBLE, 159 (register_value << 160 DA9052_GPIO_NIBBLE_SHIFT)); 161 else 162 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 163 DA9052_GPIO_0_1_REG, 164 DA9052_GPIO_MASK_LOWER_NIBBLE, 165 register_value); 166 167 return ret; 168 } 169 170 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) 171 { 172 struct da9052_gpio *gpio = gpiochip_get_data(gc); 173 struct da9052 *da9052 = gpio->da9052; 174 175 int irq; 176 177 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); 178 179 return irq; 180 } 181 182 static const struct gpio_chip reference_gp = { 183 .label = "da9052-gpio", 184 .owner = THIS_MODULE, 185 .get = da9052_gpio_get, 186 .set = da9052_gpio_set, 187 .direction_input = da9052_gpio_direction_input, 188 .direction_output = da9052_gpio_direction_output, 189 .to_irq = da9052_gpio_to_irq, 190 .can_sleep = true, 191 .ngpio = 16, 192 .base = -1, 193 }; 194 195 static int da9052_gpio_probe(struct platform_device *pdev) 196 { 197 struct da9052_gpio *gpio; 198 struct da9052_pdata *pdata; 199 int ret; 200 201 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 202 if (!gpio) 203 return -ENOMEM; 204 205 gpio->da9052 = dev_get_drvdata(pdev->dev.parent); 206 pdata = dev_get_platdata(gpio->da9052->dev); 207 208 gpio->gp = reference_gp; 209 if (pdata && pdata->gpio_base) 210 gpio->gp.base = pdata->gpio_base; 211 212 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 213 if (ret < 0) { 214 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 215 return ret; 216 } 217 218 platform_set_drvdata(pdev, gpio); 219 220 return 0; 221 } 222 223 static struct platform_driver da9052_gpio_driver = { 224 .probe = da9052_gpio_probe, 225 .driver = { 226 .name = "da9052-gpio", 227 }, 228 }; 229 230 module_platform_driver(da9052_gpio_driver); 231 232 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 233 MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); 234 MODULE_LICENSE("GPL"); 235 MODULE_ALIAS("platform:da9052-gpio"); 236