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1 | /* |
2 | * Copyright 2009-2010 Pengutronix | |
3 | * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> | |
4 | * | |
5 | * loosely based on an earlier driver that has | |
6 | * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it under | |
9 | * the terms of the GNU General Public License version 2 as published by the | |
10 | * Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/slab.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/mfd/core.h> | |
19 | #include <linux/mfd/mc13xxx.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_device.h> | |
22 | #include <linux/of_gpio.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/spi/spi.h> | |
25 | ||
26 | #include "mc13xxx.h" | |
27 | ||
28 | static const struct spi_device_id mc13xxx_device_id[] = { | |
29 | { | |
30 | .name = "mc13783", | |
31 | .driver_data = MC13XXX_ID_MC13783, | |
32 | }, { | |
33 | .name = "mc13892", | |
34 | .driver_data = MC13XXX_ID_MC13892, | |
35 | }, { | |
36 | /* sentinel */ | |
37 | } | |
38 | }; | |
39 | MODULE_DEVICE_TABLE(spi, mc13xxx_device_id); | |
40 | ||
41 | static const struct of_device_id mc13xxx_dt_ids[] = { | |
42 | { .compatible = "fsl,mc13783", .data = (void *) MC13XXX_ID_MC13783, }, | |
43 | { .compatible = "fsl,mc13892", .data = (void *) MC13XXX_ID_MC13892, }, | |
44 | { /* sentinel */ } | |
45 | }; | |
46 | MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids); | |
47 | ||
48 | static struct regmap_config mc13xxx_regmap_spi_config = { | |
49 | .reg_bits = 7, | |
50 | .pad_bits = 1, | |
51 | .val_bits = 24, | |
44716ec2 | 52 | .write_flag_mask = 0x80, |
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53 | |
54 | .max_register = MC13XXX_NUMREGS, | |
55 | ||
56 | .cache_type = REGCACHE_NONE, | |
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57 | .use_single_rw = 1, |
58 | }; | |
59 | ||
60 | static int mc13xxx_spi_read(void *context, const void *reg, size_t reg_size, | |
61 | void *val, size_t val_size) | |
62 | { | |
63 | unsigned char w[4] = { *((unsigned char *) reg), 0, 0, 0}; | |
64 | unsigned char r[4]; | |
65 | unsigned char *p = val; | |
66 | struct device *dev = context; | |
67 | struct spi_device *spi = to_spi_device(dev); | |
68 | struct spi_transfer t = { | |
69 | .tx_buf = w, | |
70 | .rx_buf = r, | |
71 | .len = 4, | |
72 | }; | |
73 | ||
74 | struct spi_message m; | |
75 | int ret; | |
76 | ||
77 | if (val_size != 3 || reg_size != 1) | |
78 | return -ENOTSUPP; | |
79 | ||
80 | spi_message_init(&m); | |
81 | spi_message_add_tail(&t, &m); | |
82 | ret = spi_sync(spi, &m); | |
83 | ||
84 | memcpy(p, &r[1], 3); | |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
89 | static int mc13xxx_spi_write(void *context, const void *data, size_t count) | |
90 | { | |
91 | struct device *dev = context; | |
92 | struct spi_device *spi = to_spi_device(dev); | |
93 | ||
94 | if (count != 4) | |
95 | return -ENOTSUPP; | |
96 | ||
97 | return spi_write(spi, data, count); | |
98 | } | |
99 | ||
100 | /* | |
101 | * We cannot use regmap-spi generic bus implementation here. | |
102 | * The MC13783 chip will get corrupted if CS signal is deasserted | |
103 | * and on i.Mx31 SoC (the target SoC for MC13783 PMIC) the SPI controller | |
104 | * has the following errata (DSPhl22960): | |
105 | * "The CSPI negates SS when the FIFO becomes empty with | |
106 | * SSCTL= 0. Software cannot guarantee that the FIFO will not | |
107 | * drain because of higher priority interrupts and the | |
108 | * non-realtime characteristics of the operating system. As a | |
109 | * result, the SS will negate before all of the data has been | |
110 | * transferred to/from the peripheral." | |
111 | * We workaround this by accessing the SPI controller with a | |
112 | * single transfert. | |
113 | */ | |
114 | ||
115 | static struct regmap_bus regmap_mc13xxx_bus = { | |
116 | .write = mc13xxx_spi_write, | |
117 | .read = mc13xxx_spi_read, | |
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118 | }; |
119 | ||
120 | static int mc13xxx_spi_probe(struct spi_device *spi) | |
121 | { | |
122 | const struct of_device_id *of_id; | |
123 | struct spi_driver *sdrv = to_spi_driver(spi->dev.driver); | |
124 | struct mc13xxx *mc13xxx; | |
125 | struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev); | |
126 | int ret; | |
127 | ||
128 | of_id = of_match_device(mc13xxx_dt_ids, &spi->dev); | |
129 | if (of_id) | |
130 | sdrv->id_table = &mc13xxx_device_id[(enum mc13xxx_id) of_id->data]; | |
131 | ||
132 | mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL); | |
133 | if (!mc13xxx) | |
134 | return -ENOMEM; | |
135 | ||
136 | dev_set_drvdata(&spi->dev, mc13xxx); | |
137 | spi->mode = SPI_MODE_0 | SPI_CS_HIGH; | |
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138 | |
139 | mc13xxx->dev = &spi->dev; | |
140 | mutex_init(&mc13xxx->lock); | |
141 | ||
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142 | mc13xxx->regmap = regmap_init(&spi->dev, ®map_mc13xxx_bus, &spi->dev, |
143 | &mc13xxx_regmap_spi_config); | |
144 | ||
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145 | if (IS_ERR(mc13xxx->regmap)) { |
146 | ret = PTR_ERR(mc13xxx->regmap); | |
147 | dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n", | |
148 | ret); | |
149 | dev_set_drvdata(&spi->dev, NULL); | |
150 | kfree(mc13xxx); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq); | |
155 | ||
156 | if (ret) { | |
157 | dev_set_drvdata(&spi->dev, NULL); | |
158 | } else { | |
159 | const struct spi_device_id *devid = | |
160 | spi_get_device_id(spi); | |
161 | if (!devid || devid->driver_data != mc13xxx->ictype) | |
162 | dev_warn(mc13xxx->dev, | |
163 | "device id doesn't match auto detection!\n"); | |
164 | } | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | static int __devexit mc13xxx_spi_remove(struct spi_device *spi) | |
170 | { | |
171 | struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev); | |
172 | ||
173 | mc13xxx_common_cleanup(mc13xxx); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct spi_driver mc13xxx_spi_driver = { | |
179 | .id_table = mc13xxx_device_id, | |
180 | .driver = { | |
181 | .name = "mc13xxx", | |
182 | .owner = THIS_MODULE, | |
183 | .of_match_table = mc13xxx_dt_ids, | |
184 | }, | |
185 | .probe = mc13xxx_spi_probe, | |
186 | .remove = __devexit_p(mc13xxx_spi_remove), | |
187 | }; | |
188 | ||
189 | static int __init mc13xxx_init(void) | |
190 | { | |
191 | return spi_register_driver(&mc13xxx_spi_driver); | |
192 | } | |
193 | subsys_initcall(mc13xxx_init); | |
194 | ||
195 | static void __exit mc13xxx_exit(void) | |
196 | { | |
197 | spi_unregister_driver(&mc13xxx_spi_driver); | |
198 | } | |
199 | module_exit(mc13xxx_exit); | |
200 | ||
201 | MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC"); | |
202 | MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>"); | |
203 | MODULE_LICENSE("GPL v2"); |