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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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
0c41839e SK |
19 | #include <linux/init.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/spi/spi.h> | |
23 | #include <linux/mfd/ab4500.h> | |
24 | ||
25 | /* just required if probe fails, we need to | |
26 | * unregister the device | |
27 | */ | |
28 | static struct spi_driver ab4500_driver; | |
29 | ||
30 | /* | |
31 | * This funtion writes to any AB4500 registers using | |
32 | * SPI protocol & before it writes it packs the data | |
33 | * in the below 24 bit frame format | |
34 | * | |
35 | * *|------------------------------------| | |
36 | * *| 23|22...18|17.......10|9|8|7......0| | |
37 | * *| r/w bank adr data | | |
38 | * * ------------------------------------ | |
39 | * | |
40 | * This function shouldn't be called from interrupt | |
41 | * context | |
42 | */ | |
43 | int ab4500_write(struct ab4500 *ab4500, unsigned char block, | |
44 | unsigned long addr, unsigned char data) | |
45 | { | |
46 | struct spi_transfer xfer; | |
47 | struct spi_message msg; | |
48 | int err; | |
49 | unsigned long spi_data = | |
50 | block << 18 | addr << 10 | data; | |
51 | ||
52 | mutex_lock(&ab4500->lock); | |
53 | ab4500->tx_buf[0] = spi_data; | |
54 | ab4500->rx_buf[0] = 0; | |
55 | ||
56 | xfer.tx_buf = ab4500->tx_buf; | |
57 | xfer.rx_buf = NULL; | |
58 | xfer.len = sizeof(unsigned long); | |
59 | ||
60 | spi_message_init(&msg); | |
61 | spi_message_add_tail(&xfer, &msg); | |
62 | ||
63 | err = spi_sync(ab4500->spi, &msg); | |
64 | mutex_unlock(&ab4500->lock); | |
65 | ||
66 | return err; | |
67 | } | |
68 | EXPORT_SYMBOL(ab4500_write); | |
69 | ||
70 | int ab4500_read(struct ab4500 *ab4500, unsigned char block, | |
71 | unsigned long addr) | |
72 | { | |
73 | struct spi_transfer xfer; | |
74 | struct spi_message msg; | |
75 | unsigned long spi_data = | |
76 | 1 << 23 | block << 18 | addr << 10; | |
77 | ||
78 | mutex_lock(&ab4500->lock); | |
79 | ab4500->tx_buf[0] = spi_data; | |
80 | ab4500->rx_buf[0] = 0; | |
81 | ||
82 | xfer.tx_buf = ab4500->tx_buf; | |
83 | xfer.rx_buf = ab4500->rx_buf; | |
84 | xfer.len = sizeof(unsigned long); | |
85 | ||
86 | spi_message_init(&msg); | |
87 | spi_message_add_tail(&xfer, &msg); | |
88 | ||
89 | spi_sync(ab4500->spi, &msg); | |
90 | mutex_unlock(&ab4500->lock); | |
91 | ||
92 | return ab4500->rx_buf[0]; | |
93 | } | |
94 | EXPORT_SYMBOL(ab4500_read); | |
95 | ||
96 | /* ref: ab3100 core */ | |
97 | #define AB4500_DEVICE(devname, devid) \ | |
98 | static struct platform_device ab4500_##devname##_device = { \ | |
99 | .name = devid, \ | |
100 | .id = -1, \ | |
101 | } | |
102 | ||
103 | /* list of childern devices of ab4500 - all are | |
104 | * not populated here - TODO | |
105 | */ | |
106 | AB4500_DEVICE(charger, "ab4500-charger"); | |
107 | AB4500_DEVICE(audio, "ab4500-audio"); | |
108 | AB4500_DEVICE(usb, "ab4500-usb"); | |
109 | AB4500_DEVICE(tvout, "ab4500-tvout"); | |
110 | AB4500_DEVICE(sim, "ab4500-sim"); | |
111 | AB4500_DEVICE(gpadc, "ab4500-gpadc"); | |
112 | AB4500_DEVICE(clkmgt, "ab4500-clkmgt"); | |
113 | AB4500_DEVICE(misc, "ab4500-misc"); | |
114 | ||
115 | static struct platform_device *ab4500_platform_devs[] = { | |
116 | &ab4500_charger_device, | |
117 | &ab4500_audio_device, | |
118 | &ab4500_usb_device, | |
119 | &ab4500_tvout_device, | |
120 | &ab4500_sim_device, | |
121 | &ab4500_gpadc_device, | |
122 | &ab4500_clkmgt_device, | |
123 | &ab4500_misc_device, | |
124 | }; | |
125 | ||
126 | static int __init ab4500_probe(struct spi_device *spi) | |
127 | { | |
128 | struct ab4500 *ab4500; | |
129 | unsigned char revision; | |
130 | int err = 0; | |
131 | int i; | |
132 | ||
133 | ab4500 = kzalloc(sizeof *ab4500, GFP_KERNEL); | |
134 | if (!ab4500) { | |
135 | dev_err(&spi->dev, "could not allocate AB4500\n"); | |
136 | err = -ENOMEM; | |
137 | goto not_detect; | |
138 | } | |
139 | ||
140 | ab4500->spi = spi; | |
141 | spi_set_drvdata(spi, ab4500); | |
142 | ||
143 | mutex_init(&ab4500->lock); | |
144 | ||
145 | /* read the revision register */ | |
146 | revision = ab4500_read(ab4500, AB4500_MISC, AB4500_REV_REG); | |
147 | ||
148 | /* revision id 0x0 is for early drop, 0x10 is for cut1.0 */ | |
149 | if (revision == 0x0 || revision == 0x10) | |
150 | dev_info(&spi->dev, "Detected chip: %s, revision = %x\n", | |
151 | ab4500_driver.driver.name, revision); | |
152 | else { | |
153 | dev_err(&spi->dev, "unknown chip: 0x%x\n", revision); | |
154 | goto not_detect; | |
155 | } | |
156 | ||
157 | for (i = 0; i < ARRAY_SIZE(ab4500_platform_devs); i++) { | |
158 | ab4500_platform_devs[i]->dev.parent = | |
159 | &spi->dev; | |
160 | platform_set_drvdata(ab4500_platform_devs[i], ab4500); | |
161 | } | |
162 | ||
163 | /* register the ab4500 platform devices */ | |
164 | platform_add_devices(ab4500_platform_devs, | |
165 | ARRAY_SIZE(ab4500_platform_devs)); | |
166 | ||
167 | return err; | |
168 | ||
169 | not_detect: | |
170 | spi_unregister_driver(&ab4500_driver); | |
171 | kfree(ab4500); | |
172 | return err; | |
173 | } | |
174 | ||
175 | static int __devexit ab4500_remove(struct spi_device *spi) | |
176 | { | |
177 | struct ab4500 *ab4500 = | |
178 | spi_get_drvdata(spi); | |
179 | ||
180 | kfree(ab4500); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static struct spi_driver ab4500_driver = { | |
186 | .driver = { | |
187 | .name = "ab4500", | |
188 | .owner = THIS_MODULE, | |
189 | }, | |
190 | .probe = ab4500_probe, | |
191 | .remove = __devexit_p(ab4500_remove) | |
192 | }; | |
193 | ||
194 | static int __devinit ab4500_init(void) | |
195 | { | |
196 | return spi_register_driver(&ab4500_driver); | |
197 | } | |
198 | ||
199 | static void __exit ab4500_exit(void) | |
200 | { | |
201 | spi_unregister_driver(&ab4500_driver); | |
202 | } | |
203 | ||
956266da SO |
204 | subsys_initcall(ab4500_init); |
205 | module_exit(ab4500_exit); | |
0c41839e SK |
206 | |
207 | MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com"); | |
208 | MODULE_DESCRIPTION("AB4500 core driver"); | |
209 | MODULE_LICENSE("GPL"); |