OpenWrt – Blame information for rev 4

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4 office 1 /*
2 * NXP 74HC153 - Dual 4-input multiplexer GPIO driver
3 *
4 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10  
11 #include <linux/version.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/gpio.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/nxp_74hc153.h>
18  
19 #define NXP_74HC153_NUM_GPIOS 8
20 #define NXP_74HC153_S0_MASK 0x1
21 #define NXP_74HC153_S1_MASK 0x2
22 #define NXP_74HC153_BANK_MASK 0x4
23  
24 struct nxp_74hc153_chip {
25 struct device *parent;
26 struct gpio_chip gpio_chip;
27 struct mutex lock;
28 };
29  
30 static struct nxp_74hc153_chip *gpio_to_nxp(struct gpio_chip *gc)
31 {
32 return container_of(gc, struct nxp_74hc153_chip, gpio_chip);
33 }
34  
35 static int nxp_74hc153_direction_input(struct gpio_chip *gc, unsigned offset)
36 {
37 return 0;
38 }
39  
40 static int nxp_74hc153_direction_output(struct gpio_chip *gc,
41 unsigned offset, int val)
42 {
43 return -EINVAL;
44 }
45  
46 static int nxp_74hc153_get_value(struct gpio_chip *gc, unsigned offset)
47 {
48 struct nxp_74hc153_chip *nxp;
49 struct nxp_74hc153_platform_data *pdata;
50 unsigned s0;
51 unsigned s1;
52 unsigned pin;
53 int ret;
54  
55 nxp = gpio_to_nxp(gc);
56 pdata = nxp->parent->platform_data;
57  
58 s0 = !!(offset & NXP_74HC153_S0_MASK);
59 s1 = !!(offset & NXP_74HC153_S1_MASK);
60 pin = (offset & NXP_74HC153_BANK_MASK) ? pdata->gpio_pin_2y
61 : pdata->gpio_pin_1y;
62  
63 mutex_lock(&nxp->lock);
64 gpio_set_value(pdata->gpio_pin_s0, s0);
65 gpio_set_value(pdata->gpio_pin_s1, s1);
66 ret = gpio_get_value(pin);
67 mutex_unlock(&nxp->lock);
68  
69 return ret;
70 }
71  
72 static void nxp_74hc153_set_value(struct gpio_chip *gc,
73 unsigned offset, int val)
74 {
75 /* not supported */
76 }
77  
78 static int nxp_74hc153_probe(struct platform_device *pdev)
79 {
80 struct nxp_74hc153_platform_data *pdata;
81 struct nxp_74hc153_chip *nxp;
82 struct gpio_chip *gc;
83 int err;
84  
85 pdata = pdev->dev.platform_data;
86 if (pdata == NULL) {
87 dev_dbg(&pdev->dev, "no platform data specified\n");
88 return -EINVAL;
89 }
90  
91 nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
92 if (nxp == NULL) {
93 dev_err(&pdev->dev, "no memory for private data\n");
94 return -ENOMEM;
95 }
96  
97 err = gpio_request(pdata->gpio_pin_s0, dev_name(&pdev->dev));
98 if (err) {
99 dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
100 pdata->gpio_pin_s0, err);
101 goto err_free_nxp;
102 }
103  
104 err = gpio_request(pdata->gpio_pin_s1, dev_name(&pdev->dev));
105 if (err) {
106 dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
107 pdata->gpio_pin_s1, err);
108 goto err_free_s0;
109 }
110  
111 err = gpio_request(pdata->gpio_pin_1y, dev_name(&pdev->dev));
112 if (err) {
113 dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
114 pdata->gpio_pin_1y, err);
115 goto err_free_s1;
116 }
117  
118 err = gpio_request(pdata->gpio_pin_2y, dev_name(&pdev->dev));
119 if (err) {
120 dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
121 pdata->gpio_pin_2y, err);
122 goto err_free_1y;
123 }
124  
125 err = gpio_direction_output(pdata->gpio_pin_s0, 0);
126 if (err) {
127 dev_err(&pdev->dev,
128 "unable to set direction of gpio %u, err=%d\n",
129 pdata->gpio_pin_s0, err);
130 goto err_free_2y;
131 }
132  
133 err = gpio_direction_output(pdata->gpio_pin_s1, 0);
134 if (err) {
135 dev_err(&pdev->dev,
136 "unable to set direction of gpio %u, err=%d\n",
137 pdata->gpio_pin_s1, err);
138 goto err_free_2y;
139 }
140  
141 err = gpio_direction_input(pdata->gpio_pin_1y);
142 if (err) {
143 dev_err(&pdev->dev,
144 "unable to set direction of gpio %u, err=%d\n",
145 pdata->gpio_pin_1y, err);
146 goto err_free_2y;
147 }
148  
149 err = gpio_direction_input(pdata->gpio_pin_2y);
150 if (err) {
151 dev_err(&pdev->dev,
152 "unable to set direction of gpio %u, err=%d\n",
153 pdata->gpio_pin_2y, err);
154 goto err_free_2y;
155 }
156  
157 nxp->parent = &pdev->dev;
158 mutex_init(&nxp->lock);
159  
160 gc = &nxp->gpio_chip;
161  
162 gc->direction_input = nxp_74hc153_direction_input;
163 gc->direction_output = nxp_74hc153_direction_output;
164 gc->get = nxp_74hc153_get_value;
165 gc->set = nxp_74hc153_set_value;
166 gc->can_sleep = 1;
167  
168 gc->base = pdata->gpio_base;
169 gc->ngpio = NXP_74HC153_NUM_GPIOS;
170 gc->label = dev_name(nxp->parent);
171 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
172 gc->dev = nxp->parent;
173 #else
174 gc->parent = nxp->parent;
175 #endif
176 gc->owner = THIS_MODULE;
177  
178 err = gpiochip_add(&nxp->gpio_chip);
179 if (err) {
180 dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
181 goto err_free_2y;
182 }
183  
184 platform_set_drvdata(pdev, nxp);
185 return 0;
186  
187 err_free_2y:
188 gpio_free(pdata->gpio_pin_2y);
189 err_free_1y:
190 gpio_free(pdata->gpio_pin_1y);
191 err_free_s1:
192 gpio_free(pdata->gpio_pin_s1);
193 err_free_s0:
194 gpio_free(pdata->gpio_pin_s0);
195 err_free_nxp:
196 kfree(nxp);
197 return err;
198 }
199  
200 static int nxp_74hc153_remove(struct platform_device *pdev)
201 {
202 struct nxp_74hc153_chip *nxp = platform_get_drvdata(pdev);
203 struct nxp_74hc153_platform_data *pdata = pdev->dev.platform_data;
204  
205 if (nxp) {
206 gpiochip_remove(&nxp->gpio_chip);
207 gpio_free(pdata->gpio_pin_2y);
208 gpio_free(pdata->gpio_pin_1y);
209 gpio_free(pdata->gpio_pin_s1);
210 gpio_free(pdata->gpio_pin_s0);
211  
212 kfree(nxp);
213 platform_set_drvdata(pdev, NULL);
214 }
215  
216 return 0;
217 }
218  
219 static struct platform_driver nxp_74hc153_driver = {
220 .probe = nxp_74hc153_probe,
221 .remove = nxp_74hc153_remove,
222 .driver = {
223 .name = NXP_74HC153_DRIVER_NAME,
224 .owner = THIS_MODULE,
225 },
226 };
227  
228 static int __init nxp_74hc153_init(void)
229 {
230 return platform_driver_register(&nxp_74hc153_driver);
231 }
232 subsys_initcall(nxp_74hc153_init);
233  
234 static void __exit nxp_74hc153_exit(void)
235 {
236 platform_driver_unregister(&nxp_74hc153_driver);
237 }
238 module_exit(nxp_74hc153_exit);
239  
240 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
241 MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC153");
242 MODULE_LICENSE("GPL v2");
243 MODULE_ALIAS("platform:" NXP_74HC153_DRIVER_NAME);