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path: root/drivers/mfd/wm8350-gpio.c
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-rw-r--r--drivers/mfd/wm8350-gpio.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/mfd/wm8350-gpio.c b/drivers/mfd/wm8350-gpio.c
new file mode 100644
index 000000000000..ebf99bef392f
--- /dev/null
+++ b/drivers/mfd/wm8350-gpio.c
@@ -0,0 +1,222 @@
1/*
2 * wm8350-core.c -- Device access for Wolfson WM8350
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/errno.h>
18
19#include <linux/mfd/wm8350/core.h>
20#include <linux/mfd/wm8350/gpio.h>
21#include <linux/mfd/wm8350/pmic.h>
22
23static int gpio_set_dir(struct wm8350 *wm8350, int gpio, int dir)
24{
25 int ret;
26
27 wm8350_reg_unlock(wm8350);
28 if (dir == WM8350_GPIO_DIR_OUT)
29 ret = wm8350_clear_bits(wm8350,
30 WM8350_GPIO_CONFIGURATION_I_O,
31 1 << gpio);
32 else
33 ret = wm8350_set_bits(wm8350,
34 WM8350_GPIO_CONFIGURATION_I_O,
35 1 << gpio);
36 wm8350_reg_lock(wm8350);
37 return ret;
38}
39
40static int gpio_set_debounce(struct wm8350 *wm8350, int gpio, int db)
41{
42 if (db == WM8350_GPIO_DEBOUNCE_ON)
43 return wm8350_set_bits(wm8350, WM8350_GPIO_DEBOUNCE,
44 1 << gpio);
45 else
46 return wm8350_clear_bits(wm8350,
47 WM8350_GPIO_DEBOUNCE, 1 << gpio);
48}
49
50static int gpio_set_func(struct wm8350 *wm8350, int gpio, int func)
51{
52 u16 reg;
53
54 wm8350_reg_unlock(wm8350);
55 switch (gpio) {
56 case 0:
57 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
58 & ~WM8350_GP0_FN_MASK;
59 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
60 reg | ((func & 0xf) << 0));
61 break;
62 case 1:
63 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
64 & ~WM8350_GP1_FN_MASK;
65 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
66 reg | ((func & 0xf) << 4));
67 break;
68 case 2:
69 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
70 & ~WM8350_GP2_FN_MASK;
71 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
72 reg | ((func & 0xf) << 8));
73 break;
74 case 3:
75 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
76 & ~WM8350_GP3_FN_MASK;
77 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
78 reg | ((func & 0xf) << 12));
79 break;
80 case 4:
81 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
82 & ~WM8350_GP4_FN_MASK;
83 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
84 reg | ((func & 0xf) << 0));
85 break;
86 case 5:
87 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
88 & ~WM8350_GP5_FN_MASK;
89 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
90 reg | ((func & 0xf) << 4));
91 break;
92 case 6:
93 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
94 & ~WM8350_GP6_FN_MASK;
95 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
96 reg | ((func & 0xf) << 8));
97 break;
98 case 7:
99 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
100 & ~WM8350_GP7_FN_MASK;
101 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
102 reg | ((func & 0xf) << 12));
103 break;
104 case 8:
105 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
106 & ~WM8350_GP8_FN_MASK;
107 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
108 reg | ((func & 0xf) << 0));
109 break;
110 case 9:
111 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
112 & ~WM8350_GP9_FN_MASK;
113 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
114 reg | ((func & 0xf) << 4));
115 break;
116 case 10:
117 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
118 & ~WM8350_GP10_FN_MASK;
119 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
120 reg | ((func & 0xf) << 8));
121 break;
122 case 11:
123 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
124 & ~WM8350_GP11_FN_MASK;
125 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
126 reg | ((func & 0xf) << 12));
127 break;
128 case 12:
129 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_4)
130 & ~WM8350_GP12_FN_MASK;
131 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_4,
132 reg | ((func & 0xf) << 0));
133 break;
134 default:
135 wm8350_reg_lock(wm8350);
136 return -EINVAL;
137 }
138
139 wm8350_reg_lock(wm8350);
140 return 0;
141}
142
143static int gpio_set_pull_up(struct wm8350 *wm8350, int gpio, int up)
144{
145 if (up)
146 return wm8350_set_bits(wm8350,
147 WM8350_GPIO_PIN_PULL_UP_CONTROL,
148 1 << gpio);
149 else
150 return wm8350_clear_bits(wm8350,
151 WM8350_GPIO_PIN_PULL_UP_CONTROL,
152 1 << gpio);
153}
154
155static int gpio_set_pull_down(struct wm8350 *wm8350, int gpio, int down)
156{
157 if (down)
158 return wm8350_set_bits(wm8350,
159 WM8350_GPIO_PULL_DOWN_CONTROL,
160 1 << gpio);
161 else
162 return wm8350_clear_bits(wm8350,
163 WM8350_GPIO_PULL_DOWN_CONTROL,
164 1 << gpio);
165}
166
167static int gpio_set_polarity(struct wm8350 *wm8350, int gpio, int pol)
168{
169 if (pol == WM8350_GPIO_ACTIVE_HIGH)
170 return wm8350_set_bits(wm8350,
171 WM8350_GPIO_PIN_POLARITY_TYPE,
172 1 << gpio);
173 else
174 return wm8350_clear_bits(wm8350,
175 WM8350_GPIO_PIN_POLARITY_TYPE,
176 1 << gpio);
177}
178
179static int gpio_set_invert(struct wm8350 *wm8350, int gpio, int invert)
180{
181 if (invert == WM8350_GPIO_INVERT_ON)
182 return wm8350_set_bits(wm8350, WM8350_GPIO_INT_MODE, 1 << gpio);
183 else
184 return wm8350_clear_bits(wm8350,
185 WM8350_GPIO_INT_MODE, 1 << gpio);
186}
187
188int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
189 int pol, int pull, int invert, int debounce)
190{
191 /* make sure we never pull up and down at the same time */
192 if (pull == WM8350_GPIO_PULL_NONE) {
193 if (gpio_set_pull_up(wm8350, gpio, 0))
194 goto err;
195 if (gpio_set_pull_down(wm8350, gpio, 0))
196 goto err;
197 } else if (pull == WM8350_GPIO_PULL_UP) {
198 if (gpio_set_pull_down(wm8350, gpio, 0))
199 goto err;
200 if (gpio_set_pull_up(wm8350, gpio, 1))
201 goto err;
202 } else if (pull == WM8350_GPIO_PULL_DOWN) {
203 if (gpio_set_pull_up(wm8350, gpio, 0))
204 goto err;
205 if (gpio_set_pull_down(wm8350, gpio, 1))
206 goto err;
207 }
208
209 if (gpio_set_invert(wm8350, gpio, invert))
210 goto err;
211 if (gpio_set_polarity(wm8350, gpio, pol))
212 goto err;
213 if (gpio_set_debounce(wm8350, gpio, debounce))
214 goto err;
215 if (gpio_set_dir(wm8350, gpio, dir))
216 goto err;
217 return gpio_set_func(wm8350, gpio, func);
218
219err:
220 return -EIO;
221}
222EXPORT_SYMBOL_GPL(wm8350_gpio_config);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-17 22:58:46 -0500