1 /* 2 * AD5593R Digital <-> Analog converters driver 3 * 4 * Copyright 2015-2016 Analog Devices Inc. 5 * Author: Paul Cercueil <paul.cercueil@analog.com> 6 * 7 * Licensed under the GPL-2. 8 */ 9 10 #include "ad5592r-base.h" 11 12 #include <linux/bitops.h> 13 #include <linux/i2c.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/acpi.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_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) 26 { 27 struct i2c_client *i2c = to_i2c_client(st->dev); 28 29 return i2c_smbus_write_word_swapped(i2c, 30 AD5593R_MODE_DAC_WRITE | chan, value); 31 } 32 33 static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) 34 { 35 struct i2c_client *i2c = to_i2c_client(st->dev); 36 s32 val; 37 38 val = i2c_smbus_write_word_swapped(i2c, 39 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan)); 40 if (val < 0) 41 return (int) val; 42 43 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK); 44 if (val < 0) 45 return (int) val; 46 47 *value = (u16) val; 48 49 return 0; 50 } 51 52 static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) 53 { 54 struct i2c_client *i2c = to_i2c_client(st->dev); 55 56 return i2c_smbus_write_word_swapped(i2c, 57 AD5593R_MODE_CONF | reg, value); 58 } 59 60 static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) 61 { 62 struct i2c_client *i2c = to_i2c_client(st->dev); 63 s32 val; 64 65 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg); 66 if (val < 0) 67 return (int) val; 68 69 *value = (u16) val; 70 71 return 0; 72 } 73 74 static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) 75 { 76 struct i2c_client *i2c = to_i2c_client(st->dev); 77 s32 val; 78 79 val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK); 80 if (val < 0) 81 return (int) val; 82 83 *value = (u8) val; 84 85 return 0; 86 } 87 88 static const struct ad5592r_rw_ops ad5593r_rw_ops = { 89 .write_dac = ad5593r_write_dac, 90 .read_adc = ad5593r_read_adc, 91 .reg_write = ad5593r_reg_write, 92 .reg_read = ad5593r_reg_read, 93 .gpio_read = ad5593r_gpio_read, 94 }; 95 96 static int ad5593r_i2c_probe(struct i2c_client *i2c, 97 const struct i2c_device_id *id) 98 { 99 return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops); 100 } 101 102 static int ad5593r_i2c_remove(struct i2c_client *i2c) 103 { 104 return ad5592r_remove(&i2c->dev); 105 } 106 107 static const struct i2c_device_id ad5593r_i2c_ids[] = { 108 { .name = "ad5593r", }, 109 {}, 110 }; 111 MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids); 112 113 static const struct of_device_id ad5593r_of_match[] = { 114 { .compatible = "adi,ad5593r", }, 115 {}, 116 }; 117 MODULE_DEVICE_TABLE(of, ad5593r_of_match); 118 119 static const struct acpi_device_id ad5593r_acpi_match[] = { 120 {"ADS5593", }, 121 { }, 122 }; 123 MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match); 124 125 static struct i2c_driver ad5593r_driver = { 126 .driver = { 127 .name = "ad5593r", 128 .of_match_table = of_match_ptr(ad5593r_of_match), 129 .acpi_match_table = ACPI_PTR(ad5593r_acpi_match), 130 }, 131 .probe = ad5593r_i2c_probe, 132 .remove = ad5593r_i2c_remove, 133 .id_table = ad5593r_i2c_ids, 134 }; 135 module_i2c_driver(ad5593r_driver); 136 137 MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>"); 138 MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); 139 MODULE_LICENSE("GPL v2"); 140