1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * lis3lv02d_spi - SPI glue layer for lis3lv02d
4  *
5  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
6  */
7 
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/err.h>
11 #include <linux/input.h>
12 #include <linux/interrupt.h>
13 #include <linux/workqueue.h>
14 #include <linux/spi/spi.h>
15 #include <linux/pm.h>
16 #include <linux/of.h>
17 #include <linux/of_platform.h>
18 #include <linux/of_device.h>
19 
20 #include "lis3lv02d.h"
21 
22 #define DRV_NAME 	"lis3lv02d_spi"
23 #define LIS3_SPI_READ	0x80
24 
25 static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
26 {
27 	struct spi_device *spi = lis3->bus_priv;
28 	int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
29 	if (ret < 0)
30 		return -EINVAL;
31 
32 	*v = (u8) ret;
33 	return 0;
34 }
35 
36 static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
37 {
38 	u8 tmp[2] = { reg, val };
39 	struct spi_device *spi = lis3->bus_priv;
40 	return spi_write(spi, tmp, sizeof(tmp));
41 }
42 
43 static int lis3_spi_init(struct lis3lv02d *lis3)
44 {
45 	u8 reg;
46 	int ret;
47 
48 	/* power up the device */
49 	ret = lis3->read(lis3, CTRL_REG1, &reg);
50 	if (ret < 0)
51 		return ret;
52 
53 	reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
54 	return lis3->write(lis3, CTRL_REG1, reg);
55 }
56 
57 static union axis_conversion lis3lv02d_axis_normal =
58 	{ .as_array = { 1, 2, 3 } };
59 
60 #ifdef CONFIG_OF
61 static const struct of_device_id lis302dl_spi_dt_ids[] = {
62 	{ .compatible = "st,lis302dl-spi" },
63 	{}
64 };
65 MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
66 #endif
67 
68 static int lis302dl_spi_probe(struct spi_device *spi)
69 {
70 	int ret;
71 
72 	spi->bits_per_word = 8;
73 	spi->mode = SPI_MODE_0;
74 	ret = spi_setup(spi);
75 	if (ret < 0)
76 		return ret;
77 
78 	lis3_dev.bus_priv	= spi;
79 	lis3_dev.init		= lis3_spi_init;
80 	lis3_dev.read		= lis3_spi_read;
81 	lis3_dev.write		= lis3_spi_write;
82 	lis3_dev.irq		= spi->irq;
83 	lis3_dev.ac		= lis3lv02d_axis_normal;
84 	lis3_dev.pdata		= spi->dev.platform_data;
85 
86 #ifdef CONFIG_OF
87 	if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
88 		lis3_dev.of_node = spi->dev.of_node;
89 		ret = lis3lv02d_init_dt(&lis3_dev);
90 		if (ret)
91 			return ret;
92 	}
93 #endif
94 	spi_set_drvdata(spi, &lis3_dev);
95 
96 	return lis3lv02d_init_device(&lis3_dev);
97 }
98 
99 static int lis302dl_spi_remove(struct spi_device *spi)
100 {
101 	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
102 	lis3lv02d_joystick_disable(lis3);
103 	lis3lv02d_poweroff(lis3);
104 
105 	return lis3lv02d_remove_fs(&lis3_dev);
106 }
107 
108 #ifdef CONFIG_PM_SLEEP
109 static int lis3lv02d_spi_suspend(struct device *dev)
110 {
111 	struct spi_device *spi = to_spi_device(dev);
112 	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
113 
114 	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
115 		lis3lv02d_poweroff(&lis3_dev);
116 
117 	return 0;
118 }
119 
120 static int lis3lv02d_spi_resume(struct device *dev)
121 {
122 	struct spi_device *spi = to_spi_device(dev);
123 	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
124 
125 	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
126 		lis3lv02d_poweron(lis3);
127 
128 	return 0;
129 }
130 #endif
131 
132 static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
133 			 lis3lv02d_spi_resume);
134 
135 static struct spi_driver lis302dl_spi_driver = {
136 	.driver	 = {
137 		.name   = DRV_NAME,
138 		.pm	= &lis3lv02d_spi_pm,
139 		.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
140 	},
141 	.probe	= lis302dl_spi_probe,
142 	.remove	= lis302dl_spi_remove,
143 };
144 
145 module_spi_driver(lis302dl_spi_driver);
146 
147 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
148 MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
149 MODULE_LICENSE("GPL");
150 MODULE_ALIAS("spi:" DRV_NAME);
151