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ee00b24f GM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2020 NovaTech LLC | |
4 | * George McCollister <george.mccollister@gmail.com> | |
5 | */ | |
6 | ||
7 | #include <linux/bits.h> | |
8 | #include <linux/i2c.h> | |
9 | #include <linux/module.h> | |
10 | #include "xrs700x.h" | |
11 | #include "xrs700x_reg.h" | |
12 | ||
add285bc TW |
13 | struct xrs700x_i2c_cmd { |
14 | __be32 reg; | |
15 | __be16 val; | |
16 | } __packed; | |
17 | ||
ee00b24f GM |
18 | static int xrs700x_i2c_reg_read(void *context, unsigned int reg, |
19 | unsigned int *val) | |
20 | { | |
21 | struct device *dev = context; | |
22 | struct i2c_client *i2c = to_i2c_client(dev); | |
add285bc | 23 | struct xrs700x_i2c_cmd cmd; |
ee00b24f GM |
24 | int ret; |
25 | ||
add285bc | 26 | cmd.reg = cpu_to_be32(reg | 1); |
ee00b24f | 27 | |
add285bc | 28 | ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg)); |
ee00b24f GM |
29 | if (ret < 0) { |
30 | dev_err(dev, "xrs i2c_master_send returned %d\n", ret); | |
31 | return ret; | |
32 | } | |
33 | ||
add285bc | 34 | ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val)); |
ee00b24f GM |
35 | if (ret < 0) { |
36 | dev_err(dev, "xrs i2c_master_recv returned %d\n", ret); | |
37 | return ret; | |
38 | } | |
39 | ||
add285bc | 40 | *val = be16_to_cpu(cmd.val); |
ee00b24f GM |
41 | return 0; |
42 | } | |
43 | ||
44 | static int xrs700x_i2c_reg_write(void *context, unsigned int reg, | |
45 | unsigned int val) | |
46 | { | |
47 | struct device *dev = context; | |
48 | struct i2c_client *i2c = to_i2c_client(dev); | |
add285bc | 49 | struct xrs700x_i2c_cmd cmd; |
ee00b24f GM |
50 | int ret; |
51 | ||
add285bc TW |
52 | cmd.reg = cpu_to_be32(reg); |
53 | cmd.val = cpu_to_be16(val); | |
ee00b24f | 54 | |
add285bc | 55 | ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd)); |
ee00b24f GM |
56 | if (ret < 0) { |
57 | dev_err(dev, "xrs i2c_master_send returned %d\n", ret); | |
58 | return ret; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static const struct regmap_config xrs700x_i2c_regmap_config = { | |
65 | .val_bits = 16, | |
66 | .reg_stride = 2, | |
67 | .reg_bits = 32, | |
68 | .pad_bits = 0, | |
69 | .write_flag_mask = 0, | |
70 | .read_flag_mask = 0, | |
71 | .reg_read = xrs700x_i2c_reg_read, | |
72 | .reg_write = xrs700x_i2c_reg_write, | |
73 | .max_register = 0, | |
74 | .cache_type = REGCACHE_NONE, | |
75 | .reg_format_endian = REGMAP_ENDIAN_BIG, | |
76 | .val_format_endian = REGMAP_ENDIAN_BIG | |
77 | }; | |
78 | ||
79 | static int xrs700x_i2c_probe(struct i2c_client *i2c, | |
80 | const struct i2c_device_id *i2c_id) | |
81 | { | |
82 | struct xrs700x *priv; | |
83 | int ret; | |
84 | ||
85 | priv = xrs700x_switch_alloc(&i2c->dev, i2c); | |
86 | if (!priv) | |
87 | return -ENOMEM; | |
88 | ||
89 | priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev, | |
90 | &xrs700x_i2c_regmap_config); | |
91 | if (IS_ERR(priv->regmap)) { | |
92 | ret = PTR_ERR(priv->regmap); | |
93 | dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | i2c_set_clientdata(i2c, priv); | |
98 | ||
99 | ret = xrs700x_switch_register(priv); | |
100 | ||
101 | /* Main DSA driver may not be started yet. */ | |
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int xrs700x_i2c_remove(struct i2c_client *i2c) | |
109 | { | |
110 | struct xrs700x *priv = i2c_get_clientdata(i2c); | |
111 | ||
a68e9da4 VO |
112 | if (!priv) |
113 | return 0; | |
114 | ||
ee00b24f GM |
115 | xrs700x_switch_remove(priv); |
116 | ||
a68e9da4 VO |
117 | i2c_set_clientdata(i2c, NULL); |
118 | ||
ee00b24f GM |
119 | return 0; |
120 | } | |
121 | ||
a68e9da4 VO |
122 | static void xrs700x_i2c_shutdown(struct i2c_client *i2c) |
123 | { | |
124 | struct xrs700x *priv = i2c_get_clientdata(i2c); | |
125 | ||
126 | if (!priv) | |
127 | return; | |
128 | ||
129 | xrs700x_switch_shutdown(priv); | |
130 | ||
131 | i2c_set_clientdata(i2c, NULL); | |
132 | } | |
133 | ||
ee00b24f GM |
134 | static const struct i2c_device_id xrs700x_i2c_id[] = { |
135 | { "xrs700x-switch", 0 }, | |
136 | {}, | |
137 | }; | |
138 | ||
139 | MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id); | |
140 | ||
3e0103a3 | 141 | static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = { |
ee00b24f GM |
142 | { .compatible = "arrow,xrs7003e", .data = &xrs7003e_info }, |
143 | { .compatible = "arrow,xrs7003f", .data = &xrs7003f_info }, | |
144 | { .compatible = "arrow,xrs7004e", .data = &xrs7004e_info }, | |
145 | { .compatible = "arrow,xrs7004f", .data = &xrs7004f_info }, | |
146 | {}, | |
147 | }; | |
148 | MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids); | |
149 | ||
150 | static struct i2c_driver xrs700x_i2c_driver = { | |
151 | .driver = { | |
152 | .name = "xrs700x-i2c", | |
153 | .of_match_table = of_match_ptr(xrs700x_i2c_dt_ids), | |
154 | }, | |
155 | .probe = xrs700x_i2c_probe, | |
156 | .remove = xrs700x_i2c_remove, | |
a68e9da4 | 157 | .shutdown = xrs700x_i2c_shutdown, |
ee00b24f GM |
158 | .id_table = xrs700x_i2c_id, |
159 | }; | |
160 | ||
161 | module_i2c_driver(xrs700x_i2c_driver); | |
162 | ||
163 | MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>"); | |
164 | MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver"); | |
165 | MODULE_LICENSE("GPL v2"); |