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cbdb53e1 AD |
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> | |
ef310f4b | 17 | #include <linux/module.h> |
cbdb53e1 AD |
18 | #include <linux/platform_device.h> |
19 | #include <linux/slab.h> | |
c013f0a5 | 20 | #include <linux/err.h> |
ce44bf5b | 21 | #include <linux/ssbi.h> |
cbdb53e1 AD |
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 | ||
29 | struct pm8921 { | |
30 | struct device *dev; | |
c013f0a5 | 31 | struct pm_irq_chip *irq_chip; |
cbdb53e1 AD |
32 | }; |
33 | ||
34 | static 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 | ||
ce44bf5b | 39 | return ssbi_read(pmic->dev->parent, addr, val, 1); |
cbdb53e1 AD |
40 | } |
41 | ||
42 | static 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 | ||
ce44bf5b | 47 | return ssbi_write(pmic->dev->parent, addr, &val, 1); |
cbdb53e1 AD |
48 | } |
49 | ||
50 | static 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 | ||
ce44bf5b | 56 | return ssbi_read(pmic->dev->parent, addr, buf, cnt); |
cbdb53e1 AD |
57 | } |
58 | ||
59 | static 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 | ||
ce44bf5b | 65 | return ssbi_write(pmic->dev->parent, addr, buf, cnt); |
cbdb53e1 AD |
66 | } |
67 | ||
c013f0a5 AD |
68 | static 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 | ||
cbdb53e1 AD |
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, | |
c013f0a5 | 81 | .pmic_read_irq_stat = pm8921_read_irq_stat, |
cbdb53e1 AD |
82 | }; |
83 | ||
f791be49 | 84 | static int pm8921_add_subdevices(const struct pm8921_platform_data |
c013f0a5 AD |
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 | ||
f791be49 | 108 | static int pm8921_probe(struct platform_device *pdev) |
cbdb53e1 | 109 | { |
334a41ce | 110 | const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev); |
cbdb53e1 AD |
111 | struct pm8921 *pmic; |
112 | int rc; | |
113 | u8 val; | |
c013f0a5 | 114 | u32 rev; |
cbdb53e1 AD |
115 | |
116 | if (!pdata) { | |
117 | pr_err("missing platform data\n"); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
b2cdcfac | 121 | pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL); |
cbdb53e1 AD |
122 | if (!pmic) { |
123 | pr_err("Cannot alloc pm8921 struct\n"); | |
124 | return -ENOMEM; | |
125 | } | |
126 | ||
127 | /* Read PMIC chip revision */ | |
ce44bf5b | 128 | rc = ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val)); |
cbdb53e1 AD |
129 | if (rc) { |
130 | pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc); | |
b2cdcfac | 131 | return rc; |
cbdb53e1 AD |
132 | } |
133 | pr_info("PMIC revision 1: %02X\n", val); | |
c013f0a5 | 134 | rev = val; |
cbdb53e1 AD |
135 | |
136 | /* Read PMIC chip revision 2 */ | |
ce44bf5b | 137 | rc = ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val)); |
cbdb53e1 AD |
138 | if (rc) { |
139 | pr_err("Failed to read hw rev 2 reg %d:rc=%d\n", | |
140 | REG_HWREV_2, rc); | |
b2cdcfac | 141 | return rc; |
cbdb53e1 AD |
142 | } |
143 | pr_info("PMIC revision 2: %02X\n", val); | |
c013f0a5 | 144 | rev |= val << BITS_PER_BYTE; |
cbdb53e1 AD |
145 | |
146 | pmic->dev = &pdev->dev; | |
147 | pm8921_drvdata.pm_chip_data = pmic; | |
148 | platform_set_drvdata(pdev, &pm8921_drvdata); | |
149 | ||
c013f0a5 AD |
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 | ||
cbdb53e1 AD |
159 | return 0; |
160 | ||
c013f0a5 AD |
161 | err: |
162 | mfd_remove_devices(pmic->dev); | |
cbdb53e1 AD |
163 | return rc; |
164 | } | |
165 | ||
4740f73f | 166 | static int pm8921_remove(struct platform_device *pdev) |
cbdb53e1 AD |
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; | |
d6daef95 | 174 | if (pmic) { |
cbdb53e1 | 175 | mfd_remove_devices(pmic->dev); |
d6daef95 DC |
176 | if (pmic->irq_chip) { |
177 | pm8xxx_irq_exit(pmic->irq_chip); | |
178 | pmic->irq_chip = NULL; | |
179 | } | |
c013f0a5 | 180 | } |
cbdb53e1 AD |
181 | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static struct platform_driver pm8921_driver = { | |
186 | .probe = pm8921_probe, | |
84449216 | 187 | .remove = pm8921_remove, |
cbdb53e1 AD |
188 | .driver = { |
189 | .name = "pm8921-core", | |
190 | .owner = THIS_MODULE, | |
191 | }, | |
192 | }; | |
193 | ||
194 | static int __init pm8921_init(void) | |
195 | { | |
196 | return platform_driver_register(&pm8921_driver); | |
197 | } | |
198 | subsys_initcall(pm8921_init); | |
199 | ||
200 | static void __exit pm8921_exit(void) | |
201 | { | |
202 | platform_driver_unregister(&pm8921_driver); | |
203 | } | |
204 | module_exit(pm8921_exit); | |
205 | ||
206 | MODULE_LICENSE("GPL v2"); | |
207 | MODULE_DESCRIPTION("PMIC 8921 core driver"); | |
208 | MODULE_VERSION("1.0"); | |
209 | MODULE_ALIAS("platform:pm8921-core"); |