1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AD5593R Digital <-> Analog converters driver 4 * 5 * Copyright 2015-2016 Analog Devices Inc. 6 * Author: Paul Cercueil <paul.cercueil@analog.com> 7 */ 8 9 #include "ad5592r-base.h" 10 11 #include <linux/bitops.h> 12 #include <linux/i2c.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/acpi.h> 16 17 #define AD5593R_MODE_CONF (0 << 4) 18 #define AD5593R_MODE_DAC_WRITE (1 << 4) 19 #define AD5593R_MODE_ADC_READBACK (4 << 4) 20 #define AD5593R_MODE_DAC_READBACK (5 << 4) 21 #define AD5593R_MODE_GPIO_READBACK (6 << 4) 22 #define AD5593R_MODE_REG_READBACK (7 << 4) 23 24 static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) 25 { 26 struct i2c_client *i2c = to_i2c_client(st->dev); 27 28 return i2c_smbus_write_word_swapped(i2c, 29 AD5593R_MODE_DAC_WRITE | chan, value); 30 } 31 32 static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) 33 { 34 struct i2c_client *i2c = to_i2c_client(st->dev); 35 s32 val; 36 37 val = i2c_smbus_write_word_swapped(i2c, 38 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan)); 39 if (val < 0) 40 return (int) val; 41 42 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK); 43 if (val < 0) 44 return (int) val; 45 46 *value = (u16) val; 47 48 return 0; 49 } 50 51 static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) 52 { 53 struct i2c_client *i2c = to_i2c_client(st->dev); 54 55 return i2c_smbus_write_word_swapped(i2c, 56 AD5593R_MODE_CONF | reg, value); 57 } 58 59 static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) 60 { 61 struct i2c_client *i2c = to_i2c_client(st->dev); 62 s32 val; 63 64 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg); 65 if (val < 0) 66 return (int) val; 67 68 *value = (u16) val; 69 70 return 0; 71 } 72 73 static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) 74 { 75 struct i2c_client *i2c = to_i2c_client(st->dev); 76 s32 val; 77 78 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK); 79 if (val < 0) 80 return (int) val; 81 82 *value = (u8) val; 83 84 return 0; 85 } 86 87 static const struct ad5592r_rw_ops ad5593r_rw_ops = { 88 .write_dac = ad5593r_write_dac, 89 .read_adc = ad5593r_read_adc, 90 .reg_write = ad5593r_reg_write, 91 .reg_read = ad5593r_reg_read, 92 .gpio_read = ad5593r_gpio_read, 93 }; 94 95 static int ad5593r_i2c_probe(struct i2c_client *i2c, 96 const struct i2c_device_id *id) 97 { 98 return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops); 99 } 100 101 static int ad5593r_i2c_remove(struct i2c_client *i2c) 102 { 103 return ad5592r_remove(&i2c->dev); 104 } 105 106 static const struct i2c_device_id ad5593r_i2c_ids[] = { 107 { .name = "ad5593r", }, 108 {}, 109 }; 110 MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids); 111 112 static const struct of_device_id ad5593r_of_match[] = { 113 { .compatible = "adi,ad5593r", }, 114 {}, 115 }; 116 MODULE_DEVICE_TABLE(of, ad5593r_of_match); 117 118 static const struct acpi_device_id ad5593r_acpi_match[] = { 119 {"ADS5593", }, 120 { }, 121 }; 122 MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match); 123 124 static struct i2c_driver ad5593r_driver = { 125 .driver = { 126 .name = "ad5593r", 127 .of_match_table = of_match_ptr(ad5593r_of_match), 128 .acpi_match_table = ACPI_PTR(ad5593r_acpi_match), 129 }, 130 .probe = ad5593r_i2c_probe, 131 .remove = ad5593r_i2c_remove, 132 .id_table = ad5593r_i2c_ids, 133 }; 134 module_i2c_driver(ad5593r_driver); 135 136 MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>"); 137 MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); 138 MODULE_LICENSE("GPL v2"); 139