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a0c7c1d4 MR |
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> | |
a0c7c1d4 MR |
16 | #include <linux/interrupt.h> |
17 | #include <linux/mfd/core.h> | |
18 | #include <linux/mfd/mc13xxx.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/of_device.h> | |
21 | #include <linux/of_gpio.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/spi/spi.h> | |
24 | ||
25 | #include "mc13xxx.h" | |
26 | ||
27 | static const struct spi_device_id mc13xxx_device_id[] = { | |
28 | { | |
29 | .name = "mc13783", | |
cd0f34b0 | 30 | .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13783, |
a0c7c1d4 MR |
31 | }, { |
32 | .name = "mc13892", | |
cd0f34b0 | 33 | .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892, |
0312e024 UKK |
34 | }, { |
35 | .name = "mc34708", | |
36 | .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708, | |
a0c7c1d4 MR |
37 | }, { |
38 | /* sentinel */ | |
39 | } | |
40 | }; | |
41 | MODULE_DEVICE_TABLE(spi, mc13xxx_device_id); | |
42 | ||
43 | static const struct of_device_id mc13xxx_dt_ids[] = { | |
cd0f34b0 UKK |
44 | { .compatible = "fsl,mc13783", .data = &mc13xxx_variant_mc13783, }, |
45 | { .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, }, | |
0312e024 | 46 | { .compatible = "fsl,mc34708", .data = &mc13xxx_variant_mc34708, }, |
a0c7c1d4 MR |
47 | { /* sentinel */ } |
48 | }; | |
49 | MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids); | |
50 | ||
51 | static struct regmap_config mc13xxx_regmap_spi_config = { | |
52 | .reg_bits = 7, | |
53 | .pad_bits = 1, | |
54 | .val_bits = 24, | |
77a5b370 | 55 | .write_flag_mask = 0x80, |
a0c7c1d4 MR |
56 | |
57 | .max_register = MC13XXX_NUMREGS, | |
58 | ||
59 | .cache_type = REGCACHE_NONE, | |
e4ecf6ea PR |
60 | .use_single_rw = 1, |
61 | }; | |
62 | ||
63 | static int mc13xxx_spi_read(void *context, const void *reg, size_t reg_size, | |
64 | void *val, size_t val_size) | |
65 | { | |
66 | unsigned char w[4] = { *((unsigned char *) reg), 0, 0, 0}; | |
67 | unsigned char r[4]; | |
68 | unsigned char *p = val; | |
69 | struct device *dev = context; | |
70 | struct spi_device *spi = to_spi_device(dev); | |
71 | struct spi_transfer t = { | |
72 | .tx_buf = w, | |
73 | .rx_buf = r, | |
74 | .len = 4, | |
75 | }; | |
76 | ||
77 | struct spi_message m; | |
78 | int ret; | |
79 | ||
80 | if (val_size != 3 || reg_size != 1) | |
81 | return -ENOTSUPP; | |
82 | ||
83 | spi_message_init(&m); | |
84 | spi_message_add_tail(&t, &m); | |
85 | ret = spi_sync(spi, &m); | |
86 | ||
87 | memcpy(p, &r[1], 3); | |
88 | ||
89 | return ret; | |
90 | } | |
91 | ||
92 | static int mc13xxx_spi_write(void *context, const void *data, size_t count) | |
93 | { | |
94 | struct device *dev = context; | |
95 | struct spi_device *spi = to_spi_device(dev); | |
fd792f8f | 96 | const char *reg = data; |
e4ecf6ea PR |
97 | |
98 | if (count != 4) | |
99 | return -ENOTSUPP; | |
100 | ||
fd792f8f MB |
101 | /* include errata fix for spi audio problems */ |
102 | if (*reg == MC13783_AUDIO_CODEC || *reg == MC13783_AUDIO_DAC) | |
103 | spi_write(spi, data, count); | |
104 | ||
e4ecf6ea PR |
105 | return spi_write(spi, data, count); |
106 | } | |
107 | ||
108 | /* | |
109 | * We cannot use regmap-spi generic bus implementation here. | |
110 | * The MC13783 chip will get corrupted if CS signal is deasserted | |
111 | * and on i.Mx31 SoC (the target SoC for MC13783 PMIC) the SPI controller | |
112 | * has the following errata (DSPhl22960): | |
113 | * "The CSPI negates SS when the FIFO becomes empty with | |
114 | * SSCTL= 0. Software cannot guarantee that the FIFO will not | |
115 | * drain because of higher priority interrupts and the | |
116 | * non-realtime characteristics of the operating system. As a | |
117 | * result, the SS will negate before all of the data has been | |
118 | * transferred to/from the peripheral." | |
119 | * We workaround this by accessing the SPI controller with a | |
120 | * single transfert. | |
121 | */ | |
122 | ||
123 | static struct regmap_bus regmap_mc13xxx_bus = { | |
124 | .write = mc13xxx_spi_write, | |
125 | .read = mc13xxx_spi_read, | |
a0c7c1d4 MR |
126 | }; |
127 | ||
128 | static int mc13xxx_spi_probe(struct spi_device *spi) | |
129 | { | |
a0c7c1d4 | 130 | struct mc13xxx *mc13xxx; |
a0c7c1d4 MR |
131 | int ret; |
132 | ||
e7c706b1 | 133 | mc13xxx = devm_kzalloc(&spi->dev, sizeof(*mc13xxx), GFP_KERNEL); |
a0c7c1d4 MR |
134 | if (!mc13xxx) |
135 | return -ENOMEM; | |
136 | ||
db9ef449 AS |
137 | dev_set_drvdata(&spi->dev, mc13xxx); |
138 | ||
a0c7c1d4 | 139 | spi->mode = SPI_MODE_0 | SPI_CS_HIGH; |
a0c7c1d4 | 140 | |
db9ef449 | 141 | mc13xxx->irq = spi->irq; |
a0c7c1d4 | 142 | |
0cfe5c90 | 143 | spi->max_speed_hz = spi->max_speed_hz ? : 26000000; |
6a5926e6 AS |
144 | ret = spi_setup(spi); |
145 | if (ret) | |
146 | return ret; | |
0cfe5c90 | 147 | |
e0308897 AL |
148 | mc13xxx->regmap = devm_regmap_init(&spi->dev, ®map_mc13xxx_bus, |
149 | &spi->dev, | |
150 | &mc13xxx_regmap_spi_config); | |
a0c7c1d4 MR |
151 | if (IS_ERR(mc13xxx->regmap)) { |
152 | ret = PTR_ERR(mc13xxx->regmap); | |
db9ef449 | 153 | dev_err(&spi->dev, "Failed to initialize regmap: %d\n", ret); |
a0c7c1d4 MR |
154 | return ret; |
155 | } | |
156 | ||
cd0f34b0 UKK |
157 | if (spi->dev.of_node) { |
158 | const struct of_device_id *of_id = | |
159 | of_match_device(mc13xxx_dt_ids, &spi->dev); | |
a0c7c1d4 | 160 | |
cd0f34b0 | 161 | mc13xxx->variant = of_id->data; |
a0c7c1d4 | 162 | } else { |
cd0f34b0 UKK |
163 | const struct spi_device_id *id_entry = spi_get_device_id(spi); |
164 | ||
165 | mc13xxx->variant = (void *)id_entry->driver_data; | |
a0c7c1d4 MR |
166 | } |
167 | ||
db9ef449 | 168 | return mc13xxx_common_init(&spi->dev); |
a0c7c1d4 MR |
169 | } |
170 | ||
4740f73f | 171 | static int mc13xxx_spi_remove(struct spi_device *spi) |
a0c7c1d4 | 172 | { |
db9ef449 | 173 | return mc13xxx_common_exit(&spi->dev); |
a0c7c1d4 MR |
174 | } |
175 | ||
176 | static struct spi_driver mc13xxx_spi_driver = { | |
177 | .id_table = mc13xxx_device_id, | |
178 | .driver = { | |
179 | .name = "mc13xxx", | |
180 | .owner = THIS_MODULE, | |
181 | .of_match_table = mc13xxx_dt_ids, | |
182 | }, | |
183 | .probe = mc13xxx_spi_probe, | |
84449216 | 184 | .remove = mc13xxx_spi_remove, |
a0c7c1d4 MR |
185 | }; |
186 | ||
187 | static int __init mc13xxx_init(void) | |
188 | { | |
189 | return spi_register_driver(&mc13xxx_spi_driver); | |
190 | } | |
191 | subsys_initcall(mc13xxx_init); | |
192 | ||
193 | static void __exit mc13xxx_exit(void) | |
194 | { | |
195 | spi_unregister_driver(&mc13xxx_spi_driver); | |
196 | } | |
197 | module_exit(mc13xxx_exit); | |
198 | ||
199 | MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC"); | |
200 | MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>"); | |
201 | MODULE_LICENSE("GPL v2"); |