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80503b23 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
51c2a487 LPC |
2 | /* |
3 | * ADT7310/ADT7310 digital temperature sensor driver | |
4 | * | |
5 | * Copyright 2012-2013 Analog Devices Inc. | |
6 | * Author: Lars-Peter Clausen <lars@metafoo.de> | |
51c2a487 LPC |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
f5320701 | 11 | #include <linux/regmap.h> |
51c2a487 LPC |
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 | ||
f5320701 | 42 | static int adt7310_spi_read_word(struct spi_device *spi, u8 reg) |
51c2a487 | 43 | { |
600ba98b | 44 | return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
51c2a487 LPC |
45 | } |
46 | ||
f5320701 | 47 | static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data) |
51c2a487 | 48 | { |
51c2a487 LPC |
49 | u8 buf[3]; |
50 | ||
51 | buf[0] = AD7310_COMMAND(reg); | |
52 | put_unaligned_be16(data, &buf[1]); | |
53 | ||
54 | return spi_write(spi, buf, sizeof(buf)); | |
55 | } | |
56 | ||
f5320701 | 57 | static int adt7310_spi_read_byte(struct spi_device *spi, u8 reg) |
51c2a487 | 58 | { |
51c2a487 LPC |
59 | return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
60 | } | |
61 | ||
f5320701 | 62 | static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data) |
51c2a487 | 63 | { |
51c2a487 LPC |
64 | u8 buf[2]; |
65 | ||
66 | buf[0] = AD7310_COMMAND(reg); | |
67 | buf[1] = data; | |
68 | ||
69 | return spi_write(spi, buf, sizeof(buf)); | |
70 | } | |
71 | ||
f5320701 GR |
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, val); | |
116 | break; | |
117 | default: | |
118 | ret = adt7310_spi_write_byte(spi, reg, 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_RBTREE, | |
128 | .volatile_reg = adt7310_regmap_is_volatile, | |
129 | .reg_read = adt7310_reg_read, | |
130 | .reg_write = adt7310_reg_write, | |
51c2a487 LPC |
131 | }; |
132 | ||
133 | static int adt7310_spi_probe(struct spi_device *spi) | |
134 | { | |
f5320701 GR |
135 | struct regmap *regmap; |
136 | ||
137 | regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config); | |
138 | if (IS_ERR(regmap)) | |
139 | return PTR_ERR(regmap); | |
140 | ||
4b5e536b | 141 | return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, |
f5320701 | 142 | regmap); |
51c2a487 LPC |
143 | } |
144 | ||
51c2a487 LPC |
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", | |
29805956 | 155 | .pm = pm_sleep_ptr(&adt7x10_dev_pm_ops), |
51c2a487 LPC |
156 | }, |
157 | .probe = adt7310_spi_probe, | |
51c2a487 LPC |
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"); |