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/mod_devicetable.h> 15 16 #include <asm/unaligned.h> 17 18 #define AD5593R_MODE_CONF (0 << 4) 19 #define AD5593R_MODE_DAC_WRITE (1 << 4) 20 #define AD5593R_MODE_ADC_READBACK (4 << 4) 21 #define AD5593R_MODE_DAC_READBACK (5 << 4) 22 #define AD5593R_MODE_GPIO_READBACK (6 << 4) 23 #define AD5593R_MODE_REG_READBACK (7 << 4) 24 25 static int ad5593r_read_word(struct i2c_client *i2c, u8 reg, u16 *value) 26 { 27 int ret; 28 u8 buf[2]; 29 30 ret = i2c_smbus_write_byte(i2c, reg); 31 if (ret < 0) 32 return ret; 33 34 ret = i2c_master_recv(i2c, buf, sizeof(buf)); 35 if (ret < 0) 36 return ret; 37 38 *value = get_unaligned_be16(buf); 39 40 return 0; 41 } 42 43 static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) 44 { 45 struct i2c_client *i2c = to_i2c_client(st->dev); 46 47 return i2c_smbus_write_word_swapped(i2c, 48 AD5593R_MODE_DAC_WRITE | chan, value); 49 } 50 51 static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) 52 { 53 struct i2c_client *i2c = to_i2c_client(st->dev); 54 s32 val; 55 56 val = i2c_smbus_write_word_swapped(i2c, 57 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan)); 58 if (val < 0) 59 return (int) val; 60 61 return ad5593r_read_word(i2c, AD5593R_MODE_ADC_READBACK, value); 62 } 63 64 static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) 65 { 66 struct i2c_client *i2c = to_i2c_client(st->dev); 67 68 return i2c_smbus_write_word_swapped(i2c, 69 AD5593R_MODE_CONF | reg, value); 70 } 71 72 static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) 73 { 74 struct i2c_client *i2c = to_i2c_client(st->dev); 75 76 return ad5593r_read_word(i2c, AD5593R_MODE_REG_READBACK | reg, value); 77 } 78 79 static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) 80 { 81 struct i2c_client *i2c = to_i2c_client(st->dev); 82 u16 val; 83 int ret; 84 85 ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val); 86 if (ret) 87 return ret; 88 89 *value = (u8) val; 90 91 return 0; 92 } 93 94 static const struct ad5592r_rw_ops ad5593r_rw_ops = { 95 .write_dac = ad5593r_write_dac, 96 .read_adc = ad5593r_read_adc, 97 .reg_write = ad5593r_reg_write, 98 .reg_read = ad5593r_reg_read, 99 .gpio_read = ad5593r_gpio_read, 100 }; 101 102 static int ad5593r_i2c_probe(struct i2c_client *i2c) 103 { 104 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 105 if (!i2c_check_functionality(i2c->adapter, 106 I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C)) 107 return -EOPNOTSUPP; 108 109 return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops); 110 } 111 112 static void ad5593r_i2c_remove(struct i2c_client *i2c) 113 { 114 ad5592r_remove(&i2c->dev); 115 } 116 117 static const struct i2c_device_id ad5593r_i2c_ids[] = { 118 { .name = "ad5593r", }, 119 {}, 120 }; 121 MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids); 122 123 static const struct of_device_id ad5593r_of_match[] = { 124 { .compatible = "adi,ad5593r", }, 125 {}, 126 }; 127 MODULE_DEVICE_TABLE(of, ad5593r_of_match); 128 129 static const struct acpi_device_id ad5593r_acpi_match[] = { 130 {"ADS5593", }, 131 { }, 132 }; 133 MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match); 134 135 static struct i2c_driver ad5593r_driver = { 136 .driver = { 137 .name = "ad5593r", 138 .of_match_table = ad5593r_of_match, 139 .acpi_match_table = ad5593r_acpi_match, 140 }, 141 .probe_new = ad5593r_i2c_probe, 142 .remove = ad5593r_i2c_remove, 143 .id_table = ad5593r_i2c_ids, 144 }; 145 module_i2c_driver(ad5593r_driver); 146 147 MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>"); 148 MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters"); 149 MODULE_LICENSE("GPL v2"); 150 MODULE_IMPORT_NS(IIO_AD5592R); 151