1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * ADT7310/ADT7310 digital temperature sensor driver |
4 | * |
5 | * Copyright 2012-2013 Analog Devices Inc. |
6 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
7 | */ |
8 | |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> |
11 | #include <linux/regmap.h> |
12 | #include <linux/spi/spi.h> |
13 | #include <asm/unaligned.h> |
14 | |
15 | #include "adt7x10.h" |
16 | |
17 | #define ADT7310_STATUS 0 |
18 | #define ADT7310_CONFIG 1 |
19 | #define ADT7310_TEMPERATURE 2 |
20 | #define ADT7310_ID 3 |
21 | #define ADT7310_T_CRIT 4 |
22 | #define ADT7310_T_HYST 5 |
23 | #define ADT7310_T_ALARM_HIGH 6 |
24 | #define ADT7310_T_ALARM_LOW 7 |
25 | |
26 | static const u8 adt7310_reg_table[] = { |
27 | [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE, |
28 | [ADT7X10_STATUS] = ADT7310_STATUS, |
29 | [ADT7X10_CONFIG] = ADT7310_CONFIG, |
30 | [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH, |
31 | [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW, |
32 | [ADT7X10_T_CRIT] = ADT7310_T_CRIT, |
33 | [ADT7X10_T_HYST] = ADT7310_T_HYST, |
34 | [ADT7X10_ID] = ADT7310_ID, |
35 | }; |
36 | |
37 | #define ADT7310_CMD_REG_OFFSET 3 |
38 | #define ADT7310_CMD_READ 0x40 |
39 | |
40 | #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET) |
41 | |
42 | static int adt7310_spi_read_word(struct spi_device *spi, u8 reg) |
43 | { |
44 | return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
45 | } |
46 | |
47 | static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data) |
48 | { |
49 | u8 buf[3]; |
50 | |
51 | buf[0] = AD7310_COMMAND(reg); |
52 | put_unaligned_be16(val: data, p: &buf[1]); |
53 | |
54 | return spi_write(spi, buf, len: sizeof(buf)); |
55 | } |
56 | |
57 | static int adt7310_spi_read_byte(struct spi_device *spi, u8 reg) |
58 | { |
59 | return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
60 | } |
61 | |
62 | static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data) |
63 | { |
64 | u8 buf[2]; |
65 | |
66 | buf[0] = AD7310_COMMAND(reg); |
67 | buf[1] = data; |
68 | |
69 | return spi_write(spi, buf, len: sizeof(buf)); |
70 | } |
71 | |
72 | static bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg) |
73 | { |
74 | switch (reg) { |
75 | case ADT7X10_TEMPERATURE: |
76 | case ADT7X10_STATUS: |
77 | return true; |
78 | default: |
79 | return false; |
80 | } |
81 | } |
82 | |
83 | static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val) |
84 | { |
85 | struct spi_device *spi = context; |
86 | int regval; |
87 | |
88 | switch (reg) { |
89 | case ADT7X10_TEMPERATURE: |
90 | case ADT7X10_T_ALARM_HIGH: |
91 | case ADT7X10_T_ALARM_LOW: |
92 | case ADT7X10_T_CRIT: |
93 | regval = adt7310_spi_read_word(spi, reg); |
94 | break; |
95 | default: |
96 | regval = adt7310_spi_read_byte(spi, reg); |
97 | break; |
98 | } |
99 | if (regval < 0) |
100 | return regval; |
101 | *val = regval; |
102 | return 0; |
103 | } |
104 | |
105 | static int adt7310_reg_write(void *context, unsigned int reg, unsigned int val) |
106 | { |
107 | struct spi_device *spi = context; |
108 | int ret; |
109 | |
110 | switch (reg) { |
111 | case ADT7X10_TEMPERATURE: |
112 | case ADT7X10_T_ALARM_HIGH: |
113 | case ADT7X10_T_ALARM_LOW: |
114 | case ADT7X10_T_CRIT: |
115 | ret = adt7310_spi_write_word(spi, reg, data: val); |
116 | break; |
117 | default: |
118 | ret = adt7310_spi_write_byte(spi, reg, data: val); |
119 | break; |
120 | } |
121 | return ret; |
122 | } |
123 | |
124 | static const struct regmap_config adt7310_regmap_config = { |
125 | .reg_bits = 8, |
126 | .val_bits = 16, |
127 | .cache_type = REGCACHE_MAPLE, |
128 | .volatile_reg = adt7310_regmap_is_volatile, |
129 | .reg_read = adt7310_reg_read, |
130 | .reg_write = adt7310_reg_write, |
131 | }; |
132 | |
133 | static int adt7310_spi_probe(struct spi_device *spi) |
134 | { |
135 | struct regmap *regmap; |
136 | |
137 | regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config); |
138 | if (IS_ERR(ptr: regmap)) |
139 | return PTR_ERR(ptr: regmap); |
140 | |
141 | return adt7x10_probe(dev: &spi->dev, name: spi_get_device_id(sdev: spi)->name, irq: spi->irq, |
142 | regmap); |
143 | } |
144 | |
145 | static const struct spi_device_id adt7310_id[] = { |
146 | { "adt7310" , 0 }, |
147 | { "adt7320" , 0 }, |
148 | {} |
149 | }; |
150 | MODULE_DEVICE_TABLE(spi, adt7310_id); |
151 | |
152 | static struct spi_driver adt7310_driver = { |
153 | .driver = { |
154 | .name = "adt7310" , |
155 | .pm = pm_sleep_ptr(&adt7x10_dev_pm_ops), |
156 | }, |
157 | .probe = adt7310_spi_probe, |
158 | .id_table = adt7310_id, |
159 | }; |
160 | module_spi_driver(adt7310_driver); |
161 | |
162 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>" ); |
163 | MODULE_DESCRIPTION("ADT7310/ADT7320 driver" ); |
164 | MODULE_LICENSE("GPL" ); |
165 | |