2 * Raspberry Pi Sense HAT core driver
3 * http://raspberrypi.org
5 * Copyright (C) 2015 Raspberry Pi
7 * Author: Serge Schneider
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * This driver is based on wm8350 implementation.
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/platform_device.h>
23 #include <linux/mfd/rpisense/core.h>
24 #include <linux/slab.h>
26 static struct rpisense *rpisense;
28 static void rpisense_client_dev_register(struct rpisense *rpisense,
30 struct platform_device **pdev)
34 *pdev = platform_device_alloc(name, -1);
36 dev_err(rpisense->dev, "Failed to allocate %s\n", name);
40 (*pdev)->dev.parent = rpisense->dev;
41 platform_set_drvdata(*pdev, rpisense);
42 ret = platform_device_add(*pdev);
44 dev_err(rpisense->dev, "Failed to register %s: %d\n",
46 platform_device_put(*pdev);
51 static int rpisense_probe(struct i2c_client *i2c)
54 struct rpisense_js *rpisense_js;
56 rpisense = devm_kzalloc(&i2c->dev, sizeof(struct rpisense), GFP_KERNEL);
60 i2c_set_clientdata(i2c, rpisense);
61 rpisense->dev = &i2c->dev;
62 rpisense->i2c_client = i2c;
64 ret = rpisense_reg_read(rpisense, RPISENSE_WAI);
71 ret = rpisense_reg_read(rpisense, RPISENSE_VER);
75 dev_info(rpisense->dev,
76 "Raspberry Pi Sense HAT firmware version %i\n", ret);
78 rpisense_js = &rpisense->joystick;
79 rpisense_js->keys_desc = devm_gpiod_get(&i2c->dev,
80 "keys-int", GPIOD_IN);
81 if (IS_ERR(rpisense_js->keys_desc)) {
82 dev_warn(&i2c->dev, "Failed to get keys-int descriptor.\n");
83 rpisense_js->keys_desc = gpio_to_desc(23);
84 if (rpisense_js->keys_desc == NULL) {
85 dev_err(&i2c->dev, "GPIO23 fallback failed.\n");
86 return PTR_ERR(rpisense_js->keys_desc);
89 rpisense_client_dev_register(rpisense, "rpi-sense-js",
90 &(rpisense->joystick.pdev));
91 rpisense_client_dev_register(rpisense, "rpi-sense-fb",
92 &(rpisense->framebuffer.pdev));
97 static void rpisense_remove(struct i2c_client *i2c)
99 struct rpisense *rpisense = i2c_get_clientdata(i2c);
101 platform_device_unregister(rpisense->joystick.pdev);
104 struct rpisense *rpisense_get_dev(void)
108 EXPORT_SYMBOL_GPL(rpisense_get_dev);
110 s32 rpisense_reg_read(struct rpisense *rpisense, int reg)
112 int ret = i2c_smbus_read_byte_data(rpisense->i2c_client, reg);
115 dev_err(rpisense->dev, "Read from reg %d failed\n", reg);
116 /* Due to the BCM270x I2C clock stretching bug, some values
117 * may have MSB set. Clear it to avoid incorrect values.
121 EXPORT_SYMBOL_GPL(rpisense_reg_read);
123 int rpisense_block_write(struct rpisense *rpisense, const char *buf, int count)
125 int ret = i2c_master_send(rpisense->i2c_client, buf, count);
128 dev_err(rpisense->dev, "Block write failed\n");
131 EXPORT_SYMBOL_GPL(rpisense_block_write);
133 static const struct i2c_device_id rpisense_i2c_id[] = {
137 MODULE_DEVICE_TABLE(i2c, rpisense_i2c_id);
140 static const struct of_device_id rpisense_core_id[] = {
141 { .compatible = "rpi,rpi-sense" },
144 MODULE_DEVICE_TABLE(of, rpisense_core_id);
148 static struct i2c_driver rpisense_driver = {
151 .owner = THIS_MODULE,
153 .probe = rpisense_probe,
154 .remove = rpisense_remove,
155 .id_table = rpisense_i2c_id,
158 module_i2c_driver(rpisense_driver);
160 MODULE_DESCRIPTION("Raspberry Pi Sense HAT core driver");
161 MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
162 MODULE_LICENSE("GPL");