diff options
Diffstat (limited to 'drivers/mfd/ab8500-spi.c')
-rw-r--r-- | drivers/mfd/ab8500-spi.c | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/drivers/mfd/ab8500-spi.c b/drivers/mfd/ab8500-spi.c deleted file mode 100644 index e1c8b62b086d..000000000000 --- a/drivers/mfd/ab8500-spi.c +++ /dev/null | |||
@@ -1,138 +0,0 @@ | |||
1 | /* | ||
2 | * Copyright (C) ST-Ericsson SA 2010 | ||
3 | * | ||
4 | * License Terms: GNU General Public License v2 | ||
5 | * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> | ||
6 | */ | ||
7 | |||
8 | #include <linux/kernel.h> | ||
9 | #include <linux/slab.h> | ||
10 | #include <linux/init.h> | ||
11 | #include <linux/module.h> | ||
12 | #include <linux/platform_device.h> | ||
13 | #include <linux/spi/spi.h> | ||
14 | #include <linux/mfd/ab8500.h> | ||
15 | |||
16 | /* | ||
17 | * This funtion writes to any AB8500 registers using | ||
18 | * SPI protocol & before it writes it packs the data | ||
19 | * in the below 24 bit frame format | ||
20 | * | ||
21 | * *|------------------------------------| | ||
22 | * *| 23|22...18|17.......10|9|8|7......0| | ||
23 | * *| r/w bank adr data | | ||
24 | * * ------------------------------------ | ||
25 | * | ||
26 | * This function shouldn't be called from interrupt | ||
27 | * context | ||
28 | */ | ||
29 | static int ab8500_spi_write(struct ab8500 *ab8500, u16 addr, u8 data) | ||
30 | { | ||
31 | struct spi_device *spi = container_of(ab8500->dev, struct spi_device, | ||
32 | dev); | ||
33 | unsigned long spi_data = addr << 10 | data; | ||
34 | struct spi_transfer xfer; | ||
35 | struct spi_message msg; | ||
36 | |||
37 | ab8500->tx_buf[0] = spi_data; | ||
38 | ab8500->rx_buf[0] = 0; | ||
39 | |||
40 | xfer.tx_buf = ab8500->tx_buf; | ||
41 | xfer.rx_buf = NULL; | ||
42 | xfer.len = sizeof(unsigned long); | ||
43 | |||
44 | spi_message_init(&msg); | ||
45 | spi_message_add_tail(&xfer, &msg); | ||
46 | |||
47 | return spi_sync(spi, &msg); | ||
48 | } | ||
49 | |||
50 | static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr) | ||
51 | { | ||
52 | struct spi_device *spi = container_of(ab8500->dev, struct spi_device, | ||
53 | dev); | ||
54 | unsigned long spi_data = 1 << 23 | addr << 10; | ||
55 | struct spi_transfer xfer; | ||
56 | struct spi_message msg; | ||
57 | int ret; | ||
58 | |||
59 | ab8500->tx_buf[0] = spi_data; | ||
60 | ab8500->rx_buf[0] = 0; | ||
61 | |||
62 | xfer.tx_buf = ab8500->tx_buf; | ||
63 | xfer.rx_buf = ab8500->rx_buf; | ||
64 | xfer.len = sizeof(unsigned long); | ||
65 | |||
66 | spi_message_init(&msg); | ||
67 | spi_message_add_tail(&xfer, &msg); | ||
68 | |||
69 | ret = spi_sync(spi, &msg); | ||
70 | if (!ret) | ||
71 | /* | ||
72 | * Only the 8 lowermost bytes are | ||
73 | * defined with value, the rest may | ||
74 | * vary depending on chip/board noise. | ||
75 | */ | ||
76 | ret = ab8500->rx_buf[0] & 0xFFU; | ||
77 | |||
78 | return ret; | ||
79 | } | ||
80 | |||
81 | static int __devinit ab8500_spi_probe(struct spi_device *spi) | ||
82 | { | ||
83 | struct ab8500 *ab8500; | ||
84 | int ret; | ||
85 | |||
86 | ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL); | ||
87 | if (!ab8500) | ||
88 | return -ENOMEM; | ||
89 | |||
90 | ab8500->dev = &spi->dev; | ||
91 | ab8500->irq = spi->irq; | ||
92 | |||
93 | ab8500->read = ab8500_spi_read; | ||
94 | ab8500->write = ab8500_spi_write; | ||
95 | |||
96 | spi_set_drvdata(spi, ab8500); | ||
97 | |||
98 | ret = ab8500_init(ab8500); | ||
99 | if (ret) | ||
100 | kfree(ab8500); | ||
101 | |||
102 | return ret; | ||
103 | } | ||
104 | |||
105 | static int __devexit ab8500_spi_remove(struct spi_device *spi) | ||
106 | { | ||
107 | struct ab8500 *ab8500 = spi_get_drvdata(spi); | ||
108 | |||
109 | ab8500_exit(ab8500); | ||
110 | kfree(ab8500); | ||
111 | |||
112 | return 0; | ||
113 | } | ||
114 | |||
115 | static struct spi_driver ab8500_spi_driver = { | ||
116 | .driver = { | ||
117 | .name = "ab8500", | ||
118 | .owner = THIS_MODULE, | ||
119 | }, | ||
120 | .probe = ab8500_spi_probe, | ||
121 | .remove = __devexit_p(ab8500_spi_remove) | ||
122 | }; | ||
123 | |||
124 | static int __init ab8500_spi_init(void) | ||
125 | { | ||
126 | return spi_register_driver(&ab8500_spi_driver); | ||
127 | } | ||
128 | subsys_initcall(ab8500_spi_init); | ||
129 | |||
130 | static void __exit ab8500_spi_exit(void) | ||
131 | { | ||
132 | spi_unregister_driver(&ab8500_spi_driver); | ||
133 | } | ||
134 | module_exit(ab8500_spi_exit); | ||
135 | |||
136 | MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com"); | ||
137 | MODULE_DESCRIPTION("AB8500 SPI"); | ||
138 | MODULE_LICENSE("GPL v2"); | ||