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0c41839e SK |
1 | /* |
2 | * Copyright (C) 2009 ST-Ericsson | |
3 | * | |
4 | * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it | |
7 | * and/or modify it under the terms of the GNU General Public | |
8 | * License version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * AB4500 is a companion power management chip used with U8500. | |
11 | * On this platform, this is interfaced with SSP0 controller | |
12 | * which is a ARM primecell pl022. | |
13 | * | |
14 | * At the moment the module just exports read/write features. | |
15 | * Interrupt management to be added - TODO. | |
16 | */ | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/spi/spi.h> | |
22 | #include <linux/mfd/ab4500.h> | |
23 | ||
24 | /* just required if probe fails, we need to | |
25 | * unregister the device | |
26 | */ | |
27 | static struct spi_driver ab4500_driver; | |
28 | ||
29 | /* | |
30 | * This funtion writes to any AB4500 registers using | |
31 | * SPI protocol & before it writes it packs the data | |
32 | * in the below 24 bit frame format | |
33 | * | |
34 | * *|------------------------------------| | |
35 | * *| 23|22...18|17.......10|9|8|7......0| | |
36 | * *| r/w bank adr data | | |
37 | * * ------------------------------------ | |
38 | * | |
39 | * This function shouldn't be called from interrupt | |
40 | * context | |
41 | */ | |
42 | int ab4500_write(struct ab4500 *ab4500, unsigned char block, | |
43 | unsigned long addr, unsigned char data) | |
44 | { | |
45 | struct spi_transfer xfer; | |
46 | struct spi_message msg; | |
47 | int err; | |
48 | unsigned long spi_data = | |
49 | block << 18 | addr << 10 | data; | |
50 | ||
51 | mutex_lock(&ab4500->lock); | |
52 | ab4500->tx_buf[0] = spi_data; | |
53 | ab4500->rx_buf[0] = 0; | |
54 | ||
55 | xfer.tx_buf = ab4500->tx_buf; | |
56 | xfer.rx_buf = NULL; | |
57 | xfer.len = sizeof(unsigned long); | |
58 | ||
59 | spi_message_init(&msg); | |
60 | spi_message_add_tail(&xfer, &msg); | |
61 | ||
62 | err = spi_sync(ab4500->spi, &msg); | |
63 | mutex_unlock(&ab4500->lock); | |
64 | ||
65 | return err; | |
66 | } | |
67 | EXPORT_SYMBOL(ab4500_write); | |
68 | ||
69 | int ab4500_read(struct ab4500 *ab4500, unsigned char block, | |
70 | unsigned long addr) | |
71 | { | |
72 | struct spi_transfer xfer; | |
73 | struct spi_message msg; | |
74 | unsigned long spi_data = | |
75 | 1 << 23 | block << 18 | addr << 10; | |
76 | ||
77 | mutex_lock(&ab4500->lock); | |
78 | ab4500->tx_buf[0] = spi_data; | |
79 | ab4500->rx_buf[0] = 0; | |
80 | ||
81 | xfer.tx_buf = ab4500->tx_buf; | |
82 | xfer.rx_buf = ab4500->rx_buf; | |
83 | xfer.len = sizeof(unsigned long); | |
84 | ||
85 | spi_message_init(&msg); | |
86 | spi_message_add_tail(&xfer, &msg); | |
87 | ||
88 | spi_sync(ab4500->spi, &msg); | |
89 | mutex_unlock(&ab4500->lock); | |
90 | ||
91 | return ab4500->rx_buf[0]; | |
92 | } | |
93 | EXPORT_SYMBOL(ab4500_read); | |
94 | ||
95 | /* ref: ab3100 core */ | |
96 | #define AB4500_DEVICE(devname, devid) \ | |
97 | static struct platform_device ab4500_##devname##_device = { \ | |
98 | .name = devid, \ | |
99 | .id = -1, \ | |
100 | } | |
101 | ||
102 | /* list of childern devices of ab4500 - all are | |
103 | * not populated here - TODO | |
104 | */ | |
105 | AB4500_DEVICE(charger, "ab4500-charger"); | |
106 | AB4500_DEVICE(audio, "ab4500-audio"); | |
107 | AB4500_DEVICE(usb, "ab4500-usb"); | |
108 | AB4500_DEVICE(tvout, "ab4500-tvout"); | |
109 | AB4500_DEVICE(sim, "ab4500-sim"); | |
110 | AB4500_DEVICE(gpadc, "ab4500-gpadc"); | |
111 | AB4500_DEVICE(clkmgt, "ab4500-clkmgt"); | |
112 | AB4500_DEVICE(misc, "ab4500-misc"); | |
113 | ||
114 | static struct platform_device *ab4500_platform_devs[] = { | |
115 | &ab4500_charger_device, | |
116 | &ab4500_audio_device, | |
117 | &ab4500_usb_device, | |
118 | &ab4500_tvout_device, | |
119 | &ab4500_sim_device, | |
120 | &ab4500_gpadc_device, | |
121 | &ab4500_clkmgt_device, | |
122 | &ab4500_misc_device, | |
123 | }; | |
124 | ||
125 | static int __init ab4500_probe(struct spi_device *spi) | |
126 | { | |
127 | struct ab4500 *ab4500; | |
128 | unsigned char revision; | |
129 | int err = 0; | |
130 | int i; | |
131 | ||
132 | ab4500 = kzalloc(sizeof *ab4500, GFP_KERNEL); | |
133 | if (!ab4500) { | |
134 | dev_err(&spi->dev, "could not allocate AB4500\n"); | |
135 | err = -ENOMEM; | |
136 | goto not_detect; | |
137 | } | |
138 | ||
139 | ab4500->spi = spi; | |
140 | spi_set_drvdata(spi, ab4500); | |
141 | ||
142 | mutex_init(&ab4500->lock); | |
143 | ||
144 | /* read the revision register */ | |
145 | revision = ab4500_read(ab4500, AB4500_MISC, AB4500_REV_REG); | |
146 | ||
147 | /* revision id 0x0 is for early drop, 0x10 is for cut1.0 */ | |
148 | if (revision == 0x0 || revision == 0x10) | |
149 | dev_info(&spi->dev, "Detected chip: %s, revision = %x\n", | |
150 | ab4500_driver.driver.name, revision); | |
151 | else { | |
152 | dev_err(&spi->dev, "unknown chip: 0x%x\n", revision); | |
153 | goto not_detect; | |
154 | } | |
155 | ||
156 | for (i = 0; i < ARRAY_SIZE(ab4500_platform_devs); i++) { | |
157 | ab4500_platform_devs[i]->dev.parent = | |
158 | &spi->dev; | |
159 | platform_set_drvdata(ab4500_platform_devs[i], ab4500); | |
160 | } | |
161 | ||
162 | /* register the ab4500 platform devices */ | |
163 | platform_add_devices(ab4500_platform_devs, | |
164 | ARRAY_SIZE(ab4500_platform_devs)); | |
165 | ||
166 | return err; | |
167 | ||
168 | not_detect: | |
169 | spi_unregister_driver(&ab4500_driver); | |
170 | kfree(ab4500); | |
171 | return err; | |
172 | } | |
173 | ||
174 | static int __devexit ab4500_remove(struct spi_device *spi) | |
175 | { | |
176 | struct ab4500 *ab4500 = | |
177 | spi_get_drvdata(spi); | |
178 | ||
179 | kfree(ab4500); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static struct spi_driver ab4500_driver = { | |
185 | .driver = { | |
186 | .name = "ab4500", | |
187 | .owner = THIS_MODULE, | |
188 | }, | |
189 | .probe = ab4500_probe, | |
190 | .remove = __devexit_p(ab4500_remove) | |
191 | }; | |
192 | ||
193 | static int __devinit ab4500_init(void) | |
194 | { | |
195 | return spi_register_driver(&ab4500_driver); | |
196 | } | |
197 | ||
198 | static void __exit ab4500_exit(void) | |
199 | { | |
200 | spi_unregister_driver(&ab4500_driver); | |
201 | } | |
202 | ||
956266da SO |
203 | subsys_initcall(ab4500_init); |
204 | module_exit(ab4500_exit); | |
0c41839e SK |
205 | |
206 | MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com"); | |
207 | MODULE_DESCRIPTION("AB4500 core driver"); | |
208 | MODULE_LICENSE("GPL"); |