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Marc Reillya0c7c1d2012-04-01 16:41:38 +10001/*
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>
Marc Reillya0c7c1d2012-04-01 16:41:38 +100016#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
27static const struct spi_device_id mc13xxx_device_id[] = {
28 {
29 .name = "mc13783",
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +000030 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13783,
Marc Reillya0c7c1d2012-04-01 16:41:38 +100031 }, {
32 .name = "mc13892",
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +000033 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
Marc Reillya0c7c1d2012-04-01 16:41:38 +100034 }, {
Uwe Kleine-König0312e022012-07-12 09:57:53 +000035 .name = "mc34708",
36 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
Marc Reillya0c7c1d2012-04-01 16:41:38 +100037 }, {
38 /* sentinel */
39 }
40};
41MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
42
43static const struct of_device_id mc13xxx_dt_ids[] = {
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +000044 { .compatible = "fsl,mc13783", .data = &mc13xxx_variant_mc13783, },
45 { .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, },
Uwe Kleine-König0312e022012-07-12 09:57:53 +000046 { .compatible = "fsl,mc34708", .data = &mc13xxx_variant_mc34708, },
Marc Reillya0c7c1d2012-04-01 16:41:38 +100047 { /* sentinel */ }
48};
49MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
50
Krzysztof Kozlowski18dd21a2015-01-05 10:01:26 +010051static const struct regmap_config mc13xxx_regmap_spi_config = {
Marc Reillya0c7c1d2012-04-01 16:41:38 +100052 .reg_bits = 7,
53 .pad_bits = 1,
54 .val_bits = 24,
Philippe Rétornaz77a5b372012-05-29 11:06:28 +020055 .write_flag_mask = 0x80,
Marc Reillya0c7c1d2012-04-01 16:41:38 +100056
57 .max_register = MC13XXX_NUMREGS,
58
59 .cache_type = REGCACHE_NONE,
Philippe Rétornaze4ecf6e2012-05-29 11:06:29 +020060 .use_single_rw = 1,
61};
62
63static 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
92static 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);
Mark Brownfd792f82013-09-23 19:14:32 +010096 const char *reg = data;
Philippe Rétornaze4ecf6e2012-05-29 11:06:29 +020097
98 if (count != 4)
99 return -ENOTSUPP;
100
Mark Brownfd792f82013-09-23 19:14:32 +0100101 /* include errata fix for spi audio problems */
102 if (*reg == MC13783_AUDIO_CODEC || *reg == MC13783_AUDIO_DAC)
103 spi_write(spi, data, count);
104
Philippe Rétornaze4ecf6e2012-05-29 11:06:29 +0200105 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
123static struct regmap_bus regmap_mc13xxx_bus = {
124 .write = mc13xxx_spi_write,
125 .read = mc13xxx_spi_read,
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000126};
127
128static int mc13xxx_spi_probe(struct spi_device *spi)
129{
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000130 struct mc13xxx *mc13xxx;
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000131 int ret;
132
Axel Line7c706b2012-06-29 15:14:36 +0200133 mc13xxx = devm_kzalloc(&spi->dev, sizeof(*mc13xxx), GFP_KERNEL);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000134 if (!mc13xxx)
135 return -ENOMEM;
136
Alexander Shiyandb9ef442013-12-14 17:03:12 +0400137 dev_set_drvdata(&spi->dev, mc13xxx);
138
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000139 spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000140
Alexander Shiyandb9ef442013-12-14 17:03:12 +0400141 mc13xxx->irq = spi->irq;
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000142
Alexander Shiyan0cfe5c92014-03-02 11:44:33 +0400143 spi->max_speed_hz = spi->max_speed_hz ? : 26000000;
Alexander Shiyan6a5926e2014-03-02 11:44:34 +0400144 ret = spi_setup(spi);
145 if (ret)
146 return ret;
Alexander Shiyan0cfe5c92014-03-02 11:44:33 +0400147
Axel Line0308892012-07-02 16:03:00 +0800148 mc13xxx->regmap = devm_regmap_init(&spi->dev, &regmap_mc13xxx_bus,
149 &spi->dev,
150 &mc13xxx_regmap_spi_config);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000151 if (IS_ERR(mc13xxx->regmap)) {
152 ret = PTR_ERR(mc13xxx->regmap);
Alexander Shiyandb9ef442013-12-14 17:03:12 +0400153 dev_err(&spi->dev, "Failed to initialize regmap: %d\n", ret);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000154 return ret;
155 }
156
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +0000157 if (spi->dev.of_node) {
158 const struct of_device_id *of_id =
159 of_match_device(mc13xxx_dt_ids, &spi->dev);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000160
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +0000161 mc13xxx->variant = of_id->data;
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000162 } else {
Uwe Kleine-Königcd0f34b2012-07-12 09:57:52 +0000163 const struct spi_device_id *id_entry = spi_get_device_id(spi);
164
165 mc13xxx->variant = (void *)id_entry->driver_data;
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000166 }
167
Alexander Shiyandb9ef442013-12-14 17:03:12 +0400168 return mc13xxx_common_init(&spi->dev);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000169}
170
Bill Pemberton4740f732012-11-19 13:26:01 -0500171static int mc13xxx_spi_remove(struct spi_device *spi)
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000172{
Alexander Shiyandb9ef442013-12-14 17:03:12 +0400173 return mc13xxx_common_exit(&spi->dev);
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000174}
175
176static struct spi_driver mc13xxx_spi_driver = {
177 .id_table = mc13xxx_device_id,
178 .driver = {
179 .name = "mc13xxx",
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000180 .of_match_table = mc13xxx_dt_ids,
181 },
182 .probe = mc13xxx_spi_probe,
Bill Pemberton84449212012-11-19 13:20:24 -0500183 .remove = mc13xxx_spi_remove,
Marc Reillya0c7c1d2012-04-01 16:41:38 +1000184};
185
186static int __init mc13xxx_init(void)
187{
188 return spi_register_driver(&mc13xxx_spi_driver);
189}
190subsys_initcall(mc13xxx_init);
191
192static void __exit mc13xxx_exit(void)
193{
194 spi_unregister_driver(&mc13xxx_spi_driver);
195}
196module_exit(mc13xxx_exit);
197
198MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
199MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
200MODULE_LICENSE("GPL v2");