2 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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.
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.
14 #define pr_fmt(fmt) "%s: " fmt, __func__
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>
26 #define REG_HWREV 0x002 /* PMIC4 revision */
27 #define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
31 struct pm_irq_chip
*irq_chip
;
34 static int pm8921_readb(const struct device
*dev
, u16 addr
, u8
*val
)
36 const struct pm8xxx_drvdata
*pm8921_drvdata
= dev_get_drvdata(dev
);
37 const struct pm8921
*pmic
= pm8921_drvdata
->pm_chip_data
;
39 return ssbi_read(pmic
->dev
->parent
, addr
, val
, 1);
42 static int pm8921_writeb(const struct device
*dev
, u16 addr
, u8 val
)
44 const struct pm8xxx_drvdata
*pm8921_drvdata
= dev_get_drvdata(dev
);
45 const struct pm8921
*pmic
= pm8921_drvdata
->pm_chip_data
;
47 return ssbi_write(pmic
->dev
->parent
, addr
, &val
, 1);
50 static int pm8921_read_buf(const struct device
*dev
, u16 addr
, u8
*buf
,
53 const struct pm8xxx_drvdata
*pm8921_drvdata
= dev_get_drvdata(dev
);
54 const struct pm8921
*pmic
= pm8921_drvdata
->pm_chip_data
;
56 return ssbi_read(pmic
->dev
->parent
, addr
, buf
, cnt
);
59 static int pm8921_write_buf(const struct device
*dev
, u16 addr
, u8
*buf
,
62 const struct pm8xxx_drvdata
*pm8921_drvdata
= dev_get_drvdata(dev
);
63 const struct pm8921
*pmic
= pm8921_drvdata
->pm_chip_data
;
65 return ssbi_write(pmic
->dev
->parent
, addr
, buf
, cnt
);
68 static int pm8921_read_irq_stat(const struct device
*dev
, int irq
)
70 const struct pm8xxx_drvdata
*pm8921_drvdata
= dev_get_drvdata(dev
);
71 const struct pm8921
*pmic
= pm8921_drvdata
->pm_chip_data
;
73 return pm8xxx_get_irq_stat(pmic
->irq_chip
, irq
);
76 static 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
,
84 static int pm8921_add_subdevices(const struct pm8921_platform_data
89 int ret
= 0, irq_base
= 0;
90 struct pm_irq_chip
*irq_chip
;
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
);
98 if (IS_ERR(irq_chip
)) {
99 pr_err("Failed to init interrupts ret=%ld\n",
101 return PTR_ERR(irq_chip
);
103 pmic
->irq_chip
= irq_chip
;
108 static int pm8921_probe(struct platform_device
*pdev
)
110 const struct pm8921_platform_data
*pdata
= dev_get_platdata(&pdev
->dev
);
117 pr_err("missing platform data\n");
121 pmic
= devm_kzalloc(&pdev
->dev
, sizeof(struct pm8921
), GFP_KERNEL
);
123 pr_err("Cannot alloc pm8921 struct\n");
127 /* Read PMIC chip revision */
128 rc
= ssbi_read(pdev
->dev
.parent
, REG_HWREV
, &val
, sizeof(val
));
130 pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV
, rc
);
133 pr_info("PMIC revision 1: %02X\n", val
);
136 /* Read PMIC chip revision 2 */
137 rc
= ssbi_read(pdev
->dev
.parent
, REG_HWREV_2
, &val
, sizeof(val
));
139 pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
143 pr_info("PMIC revision 2: %02X\n", val
);
144 rev
|= val
<< BITS_PER_BYTE
;
146 pmic
->dev
= &pdev
->dev
;
147 pm8921_drvdata
.pm_chip_data
= pmic
;
148 platform_set_drvdata(pdev
, &pm8921_drvdata
);
150 rc
= pm8921_add_subdevices(pdata
, pmic
, rev
);
152 pr_err("Cannot add subdevices rc=%d\n", rc
);
156 /* gpio might not work if no irq device is found */
157 WARN_ON(pmic
->irq_chip
== NULL
);
162 mfd_remove_devices(pmic
->dev
);
166 static int pm8921_remove(struct platform_device
*pdev
)
168 struct pm8xxx_drvdata
*drvdata
;
169 struct pm8921
*pmic
= NULL
;
171 drvdata
= platform_get_drvdata(pdev
);
173 pmic
= drvdata
->pm_chip_data
;
175 mfd_remove_devices(pmic
->dev
);
176 if (pmic
->irq_chip
) {
177 pm8xxx_irq_exit(pmic
->irq_chip
);
178 pmic
->irq_chip
= NULL
;
184 static struct platform_driver pm8921_driver
= {
185 .probe
= pm8921_probe
,
186 .remove
= pm8921_remove
,
188 .name
= "pm8921-core",
189 .owner
= THIS_MODULE
,
193 static int __init
pm8921_init(void)
195 return platform_driver_register(&pm8921_driver
);
197 subsys_initcall(pm8921_init
);
199 static void __exit
pm8921_exit(void)
201 platform_driver_unregister(&pm8921_driver
);
203 module_exit(pm8921_exit
);
205 MODULE_LICENSE("GPL v2");
206 MODULE_DESCRIPTION("PMIC 8921 core driver");
207 MODULE_VERSION("1.0");
208 MODULE_ALIAS("platform:pm8921-core");