tjh.dev
Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright (C) 2017-2020 Jacopo Mondi
4 * Copyright (C) 2017-2020 Kieran Bingham
5 * Copyright (C) 2017-2020 Laurent Pinchart
6 * Copyright (C) 2017-2020 Niklas Söderlund
7 * Copyright (C) 2016 Renesas Electronics Corporation
8 * Copyright (C) 2015 Cogent Embedded, Inc.
9 */
10
11#ifndef __MEDIA_I2C_MAX9271_H__
12#define __MEDIA_I2C_MAX9271_H__
13
14#include <linux/i2c.h>
15
16#define MAX9271_DEFAULT_ADDR 0x40
17
18/* Register 0x02 */
19#define MAX9271_SPREAD_SPECT_0 (0 << 5)
20#define MAX9271_SPREAD_SPECT_05 (1 << 5)
21#define MAX9271_SPREAD_SPECT_15 (2 << 5)
22#define MAX9271_SPREAD_SPECT_1 (5 << 5)
23#define MAX9271_SPREAD_SPECT_2 (3 << 5)
24#define MAX9271_SPREAD_SPECT_3 (6 << 5)
25#define MAX9271_SPREAD_SPECT_4 (7 << 5)
26#define MAX9271_R02_RES BIT(4)
27#define MAX9271_PCLK_AUTODETECT (3 << 2)
28#define MAX9271_SERIAL_AUTODETECT (0x03)
29/* Register 0x04 */
30#define MAX9271_SEREN BIT(7)
31#define MAX9271_CLINKEN BIT(6)
32#define MAX9271_PRBSEN BIT(5)
33#define MAX9271_SLEEP BIT(4)
34#define MAX9271_INTTYPE_I2C (0 << 2)
35#define MAX9271_INTTYPE_UART (1 << 2)
36#define MAX9271_INTTYPE_NONE (2 << 2)
37#define MAX9271_REVCCEN BIT(1)
38#define MAX9271_FWDCCEN BIT(0)
39/* Register 0x07 */
40#define MAX9271_DBL BIT(7)
41#define MAX9271_DRS BIT(6)
42#define MAX9271_BWS BIT(5)
43#define MAX9271_ES BIT(4)
44#define MAX9271_HVEN BIT(2)
45#define MAX9271_EDC_1BIT_PARITY (0 << 0)
46#define MAX9271_EDC_6BIT_CRC (1 << 0)
47#define MAX9271_EDC_6BIT_HAMMING (2 << 0)
48/* Register 0x08 */
49#define MAX9271_INVVS BIT(7)
50#define MAX9271_INVHS BIT(6)
51#define MAX9271_REV_LOGAIN BIT(3)
52#define MAX9271_REV_HIVTH BIT(0)
53/* Register 0x09 */
54#define MAX9271_ID 0x09
55/* Register 0x0d */
56#define MAX9271_I2CLOCACK BIT(7)
57#define MAX9271_I2CSLVSH_1046NS_469NS (3 << 5)
58#define MAX9271_I2CSLVSH_938NS_352NS (2 << 5)
59#define MAX9271_I2CSLVSH_469NS_234NS (1 << 5)
60#define MAX9271_I2CSLVSH_352NS_117NS (0 << 5)
61#define MAX9271_I2CMSTBT_837KBPS (7 << 2)
62#define MAX9271_I2CMSTBT_533KBPS (6 << 2)
63#define MAX9271_I2CMSTBT_339KBPS (5 << 2)
64#define MAX9271_I2CMSTBT_173KBPS (4 << 2)
65#define MAX9271_I2CMSTBT_105KBPS (3 << 2)
66#define MAX9271_I2CMSTBT_84KBPS (2 << 2)
67#define MAX9271_I2CMSTBT_28KBPS (1 << 2)
68#define MAX9271_I2CMSTBT_8KBPS (0 << 2)
69#define MAX9271_I2CSLVTO_NONE (3 << 0)
70#define MAX9271_I2CSLVTO_1024US (2 << 0)
71#define MAX9271_I2CSLVTO_256US (1 << 0)
72#define MAX9271_I2CSLVTO_64US (0 << 0)
73/* Register 0x0f */
74#define MAX9271_GPIO5OUT BIT(5)
75#define MAX9271_GPIO4OUT BIT(4)
76#define MAX9271_GPIO3OUT BIT(3)
77#define MAX9271_GPIO2OUT BIT(2)
78#define MAX9271_GPIO1OUT BIT(1)
79#define MAX9271_GPO BIT(0)
80/* Register 0x15 */
81#define MAX9271_PCLKDET BIT(0)
82
83/**
84 * struct max9271_device - max9271 device
85 * @client: The i2c client for the max9271 instance
86 */
87struct max9271_device {
88 struct i2c_client *client;
89};
90
91/**
92 * max9271_wake_up() - Wake up the serializer by issuing an i2c transaction
93 * @dev: The max9271 device
94 *
95 * This function shall be called before any other interaction with the
96 * serializer.
97 */
98void max9271_wake_up(struct max9271_device *dev);
99
100/**
101 * max9271_set_serial_link() - Enable/disable serial link
102 * @dev: The max9271 device
103 * @enable: Serial link enable/disable flag
104 *
105 * Return 0 on success or a negative error code on failure
106 */
107int max9271_set_serial_link(struct max9271_device *dev, bool enable);
108
109/**
110 * max9271_configure_i2c() - Configure I2C bus parameters
111 * @dev: The max9271 device
112 * @i2c_config: The I2C bus configuration bit mask
113 *
114 * Configure MAX9271 I2C interface. The bus configuration provided in the
115 * @i2c_config parameter shall be assembled using bit values defined by the
116 * MAX9271_I2C* macros.
117 *
118 * Return 0 on success or a negative error code on failure
119 */
120int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config);
121
122/**
123 * max9271_set_high_threshold() - Enable or disable reverse channel high
124 * threshold
125 * @dev: The max9271 device
126 * @enable: High threshold enable/disable flag
127 *
128 * Return 0 on success or a negative error code on failure
129 */
130int max9271_set_high_threshold(struct max9271_device *dev, bool enable);
131
132/**
133 * max9271_configure_gmsl_link() - Configure the GMSL link
134 * @dev: The max9271 device
135 *
136 * FIXME: the GMSL link configuration is currently hardcoded and performed
137 * by programming registers 0x04, 0x07 and 0x02.
138 *
139 * Return 0 on success or a negative error code on failure
140 */
141int max9271_configure_gmsl_link(struct max9271_device *dev);
142
143/**
144 * max9271_set_gpios() - Set gpio lines to physical high value
145 * @dev: The max9271 device
146 * @gpio_mask: The mask of gpio lines to set to high value
147 *
148 * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
149 * bit values.
150 *
151 * Return 0 on success or a negative error code on failure
152 */
153int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask);
154
155/**
156 * max9271_clear_gpios() - Set gpio lines to physical low value
157 * @dev: The max9271 device
158 * @gpio_mask: The mask of gpio lines to set to low value
159 *
160 * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]*
161 * bit values.
162 *
163 * Return 0 on success or a negative error code on failure
164 */
165int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask);
166
167/**
168 * max9271_enable_gpios() - Enable gpio lines
169 * @dev: The max9271 device
170 * @gpio_mask: The mask of gpio lines to enable
171 *
172 * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
173 * bit values. GPO line is always enabled by default.
174 *
175 * Return 0 on success or a negative error code on failure
176 */
177int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask);
178
179/**
180 * max9271_disable_gpios() - Disable gpio lines
181 * @dev: The max9271 device
182 * @gpio_mask: The mask of gpio lines to disable
183 *
184 * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO*
185 * bit values. GPO line is always enabled by default and cannot be disabled.
186 *
187 * Return 0 on success or a negative error code on failure
188 */
189int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask);
190
191/**
192 * max9271_verify_id() - Read and verify MAX9271 id
193 * @dev: The max9271 device
194 *
195 * Return 0 on success or a negative error code on failure
196 */
197int max9271_verify_id(struct max9271_device *dev);
198
199/**
200 * max9271_set_address() - Program a new I2C address
201 * @dev: The max9271 device
202 * @addr: The new I2C address in 7-bit format
203 *
204 * This function only takes care of programming the new I2C address @addr to
205 * in the MAX9271 chip registers, it is responsiblity of the caller to set
206 * the i2c address client to the @addr value to be able to communicate with
207 * the MAX9271 chip using the I2C framework APIs after this function returns.
208 *
209 * Return 0 on success or a negative error code on failure
210 */
211int max9271_set_address(struct max9271_device *dev, u8 addr);
212
213/**
214 * max9271_set_deserializer_address() - Program the remote deserializer address
215 * @dev: The max9271 device
216 * @addr: The deserializer I2C address in 7-bit format
217 *
218 * Return 0 on success or a negative error code on failure
219 */
220int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr);
221
222/**
223 * max9271_set_translation() - Program I2C address translation
224 * @dev: The max9271 device
225 * @source: The I2C source address
226 * @dest: The I2C destination address
227 *
228 * Program address translation from @source to @dest. This is required to
229 * communicate with local devices that do not support address reprogramming.
230 *
231 * TODO: The device supports translation of two address, this function currently
232 * supports a single one.
233 *
234 * Return 0 on success or a negative error code on failure
235 */
236int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest);
237
238#endif /* __MEDIA_I2C_MAX9271_H__ */