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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 | ||
23 | static 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 | ||
40 | static 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 | ||
50 | static 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 | ||
143 | static 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 | ||
155 | static 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 | ||
167 | static 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 | ||
179 | static 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 | ||
188 | int 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 | ||
219 | err: | |
220 | return -EIO; | |
221 | } | |
222 | EXPORT_SYMBOL_GPL(wm8350_gpio_config); |