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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> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/slab.h> | |
c013f0a5 | 19 | #include <linux/err.h> |
ce44bf5b | 20 | #include <linux/ssbi.h> |
cbdb53e1 AD |
21 | #include <linux/mfd/core.h> |
22 | #include <linux/mfd/pm8xxx/pm8921.h> | |
23 | #include <linux/mfd/pm8xxx/core.h> | |
24 | ||
25 | #define REG_HWREV 0x002 /* PMIC4 revision */ | |
26 | #define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */ | |
27 | ||
28 | struct pm8921 { | |
29 | struct device *dev; | |
c013f0a5 | 30 | struct pm_irq_chip *irq_chip; |
cbdb53e1 AD |
31 | }; |
32 | ||
33 | static int pm8921_readb(const struct device *dev, u16 addr, u8 *val) | |
34 | { | |
35 | const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); | |
36 | const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; | |
37 | ||
ce44bf5b | 38 | return ssbi_read(pmic->dev->parent, addr, val, 1); |
cbdb53e1 AD |
39 | } |
40 | ||
41 | static int pm8921_writeb(const struct device *dev, u16 addr, u8 val) | |
42 | { | |
43 | const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); | |
44 | const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; | |
45 | ||
ce44bf5b | 46 | return ssbi_write(pmic->dev->parent, addr, &val, 1); |
cbdb53e1 AD |
47 | } |
48 | ||
49 | static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf, | |
50 | int cnt) | |
51 | { | |
52 | const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); | |
53 | const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; | |
54 | ||
ce44bf5b | 55 | return ssbi_read(pmic->dev->parent, addr, buf, cnt); |
cbdb53e1 AD |
56 | } |
57 | ||
58 | static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf, | |
59 | int cnt) | |
60 | { | |
61 | const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); | |
62 | const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; | |
63 | ||
ce44bf5b | 64 | return ssbi_write(pmic->dev->parent, addr, buf, cnt); |
cbdb53e1 AD |
65 | } |
66 | ||
c013f0a5 AD |
67 | static int pm8921_read_irq_stat(const struct device *dev, int irq) |
68 | { | |
69 | const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); | |
70 | const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; | |
71 | ||
72 | return pm8xxx_get_irq_stat(pmic->irq_chip, irq); | |
73 | } | |
74 | ||
cbdb53e1 AD |
75 | static struct pm8xxx_drvdata pm8921_drvdata = { |
76 | .pmic_readb = pm8921_readb, | |
77 | .pmic_writeb = pm8921_writeb, | |
78 | .pmic_read_buf = pm8921_read_buf, | |
79 | .pmic_write_buf = pm8921_write_buf, | |
c013f0a5 | 80 | .pmic_read_irq_stat = pm8921_read_irq_stat, |
cbdb53e1 AD |
81 | }; |
82 | ||
f791be49 | 83 | static int pm8921_add_subdevices(const struct pm8921_platform_data |
c013f0a5 AD |
84 | *pdata, |
85 | struct pm8921 *pmic, | |
86 | u32 rev) | |
87 | { | |
88 | int ret = 0, irq_base = 0; | |
89 | struct pm_irq_chip *irq_chip; | |
90 | ||
91 | if (pdata->irq_pdata) { | |
92 | pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS; | |
93 | pdata->irq_pdata->irq_cdata.rev = rev; | |
94 | irq_base = pdata->irq_pdata->irq_base; | |
95 | irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata); | |
96 | ||
97 | if (IS_ERR(irq_chip)) { | |
98 | pr_err("Failed to init interrupts ret=%ld\n", | |
99 | PTR_ERR(irq_chip)); | |
100 | return PTR_ERR(irq_chip); | |
101 | } | |
102 | pmic->irq_chip = irq_chip; | |
103 | } | |
104 | return ret; | |
105 | } | |
106 | ||
f791be49 | 107 | static int pm8921_probe(struct platform_device *pdev) |
cbdb53e1 AD |
108 | { |
109 | const struct pm8921_platform_data *pdata = pdev->dev.platform_data; | |
110 | struct pm8921 *pmic; | |
111 | int rc; | |
112 | u8 val; | |
c013f0a5 | 113 | u32 rev; |
cbdb53e1 AD |
114 | |
115 | if (!pdata) { | |
116 | pr_err("missing platform data\n"); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL); | |
121 | if (!pmic) { | |
122 | pr_err("Cannot alloc pm8921 struct\n"); | |
123 | return -ENOMEM; | |
124 | } | |
125 | ||
126 | /* Read PMIC chip revision */ | |
ce44bf5b | 127 | rc = ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val)); |
cbdb53e1 AD |
128 | if (rc) { |
129 | pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc); | |
130 | goto err_read_rev; | |
131 | } | |
132 | pr_info("PMIC revision 1: %02X\n", val); | |
c013f0a5 | 133 | rev = val; |
cbdb53e1 AD |
134 | |
135 | /* Read PMIC chip revision 2 */ | |
ce44bf5b | 136 | rc = ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val)); |
cbdb53e1 AD |
137 | if (rc) { |
138 | pr_err("Failed to read hw rev 2 reg %d:rc=%d\n", | |
139 | REG_HWREV_2, rc); | |
140 | goto err_read_rev; | |
141 | } | |
142 | pr_info("PMIC revision 2: %02X\n", val); | |
c013f0a5 | 143 | rev |= val << BITS_PER_BYTE; |
cbdb53e1 AD |
144 | |
145 | pmic->dev = &pdev->dev; | |
146 | pm8921_drvdata.pm_chip_data = pmic; | |
147 | platform_set_drvdata(pdev, &pm8921_drvdata); | |
148 | ||
c013f0a5 AD |
149 | rc = pm8921_add_subdevices(pdata, pmic, rev); |
150 | if (rc) { | |
151 | pr_err("Cannot add subdevices rc=%d\n", rc); | |
152 | goto err; | |
153 | } | |
154 | ||
155 | /* gpio might not work if no irq device is found */ | |
156 | WARN_ON(pmic->irq_chip == NULL); | |
157 | ||
cbdb53e1 AD |
158 | return 0; |
159 | ||
c013f0a5 AD |
160 | err: |
161 | mfd_remove_devices(pmic->dev); | |
162 | platform_set_drvdata(pdev, NULL); | |
cbdb53e1 AD |
163 | err_read_rev: |
164 | kfree(pmic); | |
165 | return rc; | |
166 | } | |
167 | ||
4740f73f | 168 | static int pm8921_remove(struct platform_device *pdev) |
cbdb53e1 AD |
169 | { |
170 | struct pm8xxx_drvdata *drvdata; | |
171 | struct pm8921 *pmic = NULL; | |
172 | ||
173 | drvdata = platform_get_drvdata(pdev); | |
174 | if (drvdata) | |
175 | pmic = drvdata->pm_chip_data; | |
176 | if (pmic) | |
177 | mfd_remove_devices(pmic->dev); | |
c013f0a5 AD |
178 | if (pmic->irq_chip) { |
179 | pm8xxx_irq_exit(pmic->irq_chip); | |
180 | pmic->irq_chip = NULL; | |
181 | } | |
cbdb53e1 AD |
182 | platform_set_drvdata(pdev, NULL); |
183 | kfree(pmic); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static struct platform_driver pm8921_driver = { | |
189 | .probe = pm8921_probe, | |
84449216 | 190 | .remove = pm8921_remove, |
cbdb53e1 AD |
191 | .driver = { |
192 | .name = "pm8921-core", | |
193 | .owner = THIS_MODULE, | |
194 | }, | |
195 | }; | |
196 | ||
197 | static int __init pm8921_init(void) | |
198 | { | |
199 | return platform_driver_register(&pm8921_driver); | |
200 | } | |
201 | subsys_initcall(pm8921_init); | |
202 | ||
203 | static void __exit pm8921_exit(void) | |
204 | { | |
205 | platform_driver_unregister(&pm8921_driver); | |
206 | } | |
207 | module_exit(pm8921_exit); | |
208 | ||
209 | MODULE_LICENSE("GPL v2"); | |
210 | MODULE_DESCRIPTION("PMIC 8921 core driver"); | |
211 | MODULE_VERSION("1.0"); | |
212 | MODULE_ALIAS("platform:pm8921-core"); |