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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>
19 #include <linux/err.h>
20 #include <linux/msm_ssbi.h>
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;
30 	struct pm_irq_chip		*irq_chip;
31 };
32 
pm8921_readb(const struct device * dev,u16 addr,u8 * val)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 
38 	return msm_ssbi_read(pmic->dev->parent, addr, val, 1);
39 }
40 
pm8921_writeb(const struct device * dev,u16 addr,u8 val)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 
46 	return msm_ssbi_write(pmic->dev->parent, addr, &val, 1);
47 }
48 
pm8921_read_buf(const struct device * dev,u16 addr,u8 * buf,int cnt)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 
55 	return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt);
56 }
57 
pm8921_write_buf(const struct device * dev,u16 addr,u8 * buf,int cnt)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 
64 	return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt);
65 }
66 
pm8921_read_irq_stat(const struct device * dev,int irq)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 
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,
80 	.pmic_read_irq_stat	= pm8921_read_irq_stat,
81 };
82 
pm8921_add_subdevices(const struct pm8921_platform_data * pdata,struct pm8921 * pmic,u32 rev)83 static int __devinit pm8921_add_subdevices(const struct pm8921_platform_data
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 
pm8921_probe(struct platform_device * pdev)107 static int __devinit pm8921_probe(struct platform_device *pdev)
108 {
109 	const struct pm8921_platform_data *pdata = pdev->dev.platform_data;
110 	struct pm8921 *pmic;
111 	int rc;
112 	u8 val;
113 	u32 rev;
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 */
127 	rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
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);
133 	rev = val;
134 
135 	/* Read PMIC chip revision 2 */
136 	rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
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);
143 	rev |= val << BITS_PER_BYTE;
144 
145 	pmic->dev = &pdev->dev;
146 	pm8921_drvdata.pm_chip_data = pmic;
147 	platform_set_drvdata(pdev, &pm8921_drvdata);
148 
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 
158 	return 0;
159 
160 err:
161 	mfd_remove_devices(pmic->dev);
162 	platform_set_drvdata(pdev, NULL);
163 err_read_rev:
164 	kfree(pmic);
165 	return rc;
166 }
167 
pm8921_remove(struct platform_device * pdev)168 static int __devexit pm8921_remove(struct platform_device *pdev)
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);
178 	if (pmic->irq_chip) {
179 		pm8xxx_irq_exit(pmic->irq_chip);
180 		pmic->irq_chip = NULL;
181 	}
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,
190 	.remove		= __devexit_p(pm8921_remove),
191 	.driver		= {
192 		.name	= "pm8921-core",
193 		.owner	= THIS_MODULE,
194 	},
195 };
196 
pm8921_init(void)197 static int __init pm8921_init(void)
198 {
199 	return platform_driver_register(&pm8921_driver);
200 }
201 subsys_initcall(pm8921_init);
202 
pm8921_exit(void)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");
213