tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#define pr_fmt(fmt) "%s: " fmt, __func__
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include <linux/err.h>
21#include <linux/ssbi.h>
22#include <linux/mfd/core.h>
23#include <linux/mfd/pm8xxx/pm8921.h>
24#include <linux/mfd/pm8xxx/core.h>
25
26#define REG_HWREV 0x002 /* PMIC4 revision */
27#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
28
29struct pm8921 {
30 struct device *dev;
31 struct pm_irq_chip *irq_chip;
32};
33
34static int pm8921_readb(const struct device *dev, u16 addr, u8 *val)
35{
36 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
37 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
38
39 return ssbi_read(pmic->dev->parent, addr, val, 1);
40}
41
42static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
43{
44 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
45 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
46
47 return ssbi_write(pmic->dev->parent, addr, &val, 1);
48}
49
50static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf,
51 int cnt)
52{
53 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
54 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
55
56 return ssbi_read(pmic->dev->parent, addr, buf, cnt);
57}
58
59static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf,
60 int cnt)
61{
62 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
63 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
64
65 return ssbi_write(pmic->dev->parent, addr, buf, cnt);
66}
67
68static int pm8921_read_irq_stat(const struct device *dev, int irq)
69{
70 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
71 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
72
73 return pm8xxx_get_irq_stat(pmic->irq_chip, irq);
74}
75
76static struct pm8xxx_drvdata pm8921_drvdata = {
77 .pmic_readb = pm8921_readb,
78 .pmic_writeb = pm8921_writeb,
79 .pmic_read_buf = pm8921_read_buf,
80 .pmic_write_buf = pm8921_write_buf,
81 .pmic_read_irq_stat = pm8921_read_irq_stat,
82};
83
84static int pm8921_add_subdevices(const struct pm8921_platform_data
85 *pdata,
86 struct pm8921 *pmic,
87 u32 rev)
88{
89 int ret = 0, irq_base = 0;
90 struct pm_irq_chip *irq_chip;
91
92 if (pdata->irq_pdata) {
93 pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS;
94 pdata->irq_pdata->irq_cdata.rev = rev;
95 irq_base = pdata->irq_pdata->irq_base;
96 irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);
97
98 if (IS_ERR(irq_chip)) {
99 pr_err("Failed to init interrupts ret=%ld\n",
100 PTR_ERR(irq_chip));
101 return PTR_ERR(irq_chip);
102 }
103 pmic->irq_chip = irq_chip;
104 }
105 return ret;
106}
107
108static int pm8921_probe(struct platform_device *pdev)
109{
110 const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev);
111 struct pm8921 *pmic;
112 int rc;
113 u8 val;
114 u32 rev;
115
116 if (!pdata) {
117 pr_err("missing platform data\n");
118 return -EINVAL;
119 }
120
121 pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
122 if (!pmic) {
123 pr_err("Cannot alloc pm8921 struct\n");
124 return -ENOMEM;
125 }
126
127 /* Read PMIC chip revision */
128 rc = ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
129 if (rc) {
130 pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
131 return rc;
132 }
133 pr_info("PMIC revision 1: %02X\n", val);
134 rev = val;
135
136 /* Read PMIC chip revision 2 */
137 rc = ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
138 if (rc) {
139 pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
140 REG_HWREV_2, rc);
141 return rc;
142 }
143 pr_info("PMIC revision 2: %02X\n", val);
144 rev |= val << BITS_PER_BYTE;
145
146 pmic->dev = &pdev->dev;
147 pm8921_drvdata.pm_chip_data = pmic;
148 platform_set_drvdata(pdev, &pm8921_drvdata);
149
150 rc = pm8921_add_subdevices(pdata, pmic, rev);
151 if (rc) {
152 pr_err("Cannot add subdevices rc=%d\n", rc);
153 goto err;
154 }
155
156 /* gpio might not work if no irq device is found */
157 WARN_ON(pmic->irq_chip == NULL);
158
159 return 0;
160
161err:
162 mfd_remove_devices(pmic->dev);
163 return rc;
164}
165
166static int pm8921_remove(struct platform_device *pdev)
167{
168 struct pm8xxx_drvdata *drvdata;
169 struct pm8921 *pmic = NULL;
170
171 drvdata = platform_get_drvdata(pdev);
172 if (drvdata)
173 pmic = drvdata->pm_chip_data;
174 if (pmic) {
175 mfd_remove_devices(pmic->dev);
176 if (pmic->irq_chip) {
177 pm8xxx_irq_exit(pmic->irq_chip);
178 pmic->irq_chip = NULL;
179 }
180 }
181
182 return 0;
183}
184
185static struct platform_driver pm8921_driver = {
186 .probe = pm8921_probe,
187 .remove = pm8921_remove,
188 .driver = {
189 .name = "pm8921-core",
190 .owner = THIS_MODULE,
191 },
192};
193
194static int __init pm8921_init(void)
195{
196 return platform_driver_register(&pm8921_driver);
197}
198subsys_initcall(pm8921_init);
199
200static void __exit pm8921_exit(void)
201{
202 platform_driver_unregister(&pm8921_driver);
203}
204module_exit(pm8921_exit);
205
206MODULE_LICENSE("GPL v2");
207MODULE_DESCRIPTION("PMIC 8921 core driver");
208MODULE_VERSION("1.0");
209MODULE_ALIAS("platform:pm8921-core");