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