diff options
Diffstat (limited to 'drivers/mfd/twl6030-pwm.c')
-rw-r--r-- | drivers/mfd/twl6030-pwm.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/drivers/mfd/twl6030-pwm.c b/drivers/mfd/twl6030-pwm.c deleted file mode 100644 index e8fee147678d..000000000000 --- a/drivers/mfd/twl6030-pwm.c +++ /dev/null | |||
@@ -1,165 +0,0 @@ | |||
1 | /* | ||
2 | * twl6030_pwm.c | ||
3 | * Driver for PHOENIX (TWL6030) Pulse Width Modulator | ||
4 | * | ||
5 | * Copyright (C) 2010 Texas Instruments | ||
6 | * Author: Hemanth V <hemanthv@ti.com> | ||
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 version 2 as published by | ||
10 | * the Free Software Foundation. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, but WITHOUT | ||
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
15 | * more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License along with | ||
18 | * this program. If not, see <http://www.gnu.org/licenses/>. | ||
19 | */ | ||
20 | |||
21 | #include <linux/module.h> | ||
22 | #include <linux/platform_device.h> | ||
23 | #include <linux/i2c/twl.h> | ||
24 | #include <linux/slab.h> | ||
25 | |||
26 | #define LED_PWM_CTRL1 0xF4 | ||
27 | #define LED_PWM_CTRL2 0xF5 | ||
28 | |||
29 | /* Max value for CTRL1 register */ | ||
30 | #define PWM_CTRL1_MAX 255 | ||
31 | |||
32 | /* Pull down disable */ | ||
33 | #define PWM_CTRL2_DIS_PD (1 << 6) | ||
34 | |||
35 | /* Current control 2.5 milli Amps */ | ||
36 | #define PWM_CTRL2_CURR_02 (2 << 4) | ||
37 | |||
38 | /* LED supply source */ | ||
39 | #define PWM_CTRL2_SRC_VAC (1 << 2) | ||
40 | |||
41 | /* LED modes */ | ||
42 | #define PWM_CTRL2_MODE_HW (0 << 0) | ||
43 | #define PWM_CTRL2_MODE_SW (1 << 0) | ||
44 | #define PWM_CTRL2_MODE_DIS (2 << 0) | ||
45 | |||
46 | #define PWM_CTRL2_MODE_MASK 0x3 | ||
47 | |||
48 | struct pwm_device { | ||
49 | const char *label; | ||
50 | unsigned int pwm_id; | ||
51 | }; | ||
52 | |||
53 | int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) | ||
54 | { | ||
55 | u8 duty_cycle; | ||
56 | int ret; | ||
57 | |||
58 | if (pwm == NULL || period_ns == 0 || duty_ns > period_ns) | ||
59 | return -EINVAL; | ||
60 | |||
61 | duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns; | ||
62 | |||
63 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, duty_cycle, LED_PWM_CTRL1); | ||
64 | |||
65 | if (ret < 0) { | ||
66 | pr_err("%s: Failed to configure PWM, Error %d\n", | ||
67 | pwm->label, ret); | ||
68 | return ret; | ||
69 | } | ||
70 | return 0; | ||
71 | } | ||
72 | EXPORT_SYMBOL(pwm_config); | ||
73 | |||
74 | int pwm_enable(struct pwm_device *pwm) | ||
75 | { | ||
76 | u8 val; | ||
77 | int ret; | ||
78 | |||
79 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2); | ||
80 | if (ret < 0) { | ||
81 | pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret); | ||
82 | return ret; | ||
83 | } | ||
84 | |||
85 | /* Change mode to software control */ | ||
86 | val &= ~PWM_CTRL2_MODE_MASK; | ||
87 | val |= PWM_CTRL2_MODE_SW; | ||
88 | |||
89 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2); | ||
90 | if (ret < 0) { | ||
91 | pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret); | ||
92 | return ret; | ||
93 | } | ||
94 | |||
95 | twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2); | ||
96 | return 0; | ||
97 | } | ||
98 | EXPORT_SYMBOL(pwm_enable); | ||
99 | |||
100 | void pwm_disable(struct pwm_device *pwm) | ||
101 | { | ||
102 | u8 val; | ||
103 | int ret; | ||
104 | |||
105 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2); | ||
106 | if (ret < 0) { | ||
107 | pr_err("%s: Failed to disable PWM, Error %d\n", | ||
108 | pwm->label, ret); | ||
109 | return; | ||
110 | } | ||
111 | |||
112 | val &= ~PWM_CTRL2_MODE_MASK; | ||
113 | val |= PWM_CTRL2_MODE_HW; | ||
114 | |||
115 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2); | ||
116 | if (ret < 0) { | ||
117 | pr_err("%s: Failed to disable PWM, Error %d\n", | ||
118 | pwm->label, ret); | ||
119 | return; | ||
120 | } | ||
121 | return; | ||
122 | } | ||
123 | EXPORT_SYMBOL(pwm_disable); | ||
124 | |||
125 | struct pwm_device *pwm_request(int pwm_id, const char *label) | ||
126 | { | ||
127 | u8 val; | ||
128 | int ret; | ||
129 | struct pwm_device *pwm; | ||
130 | |||
131 | pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); | ||
132 | if (pwm == NULL) { | ||
133 | pr_err("%s: failed to allocate memory\n", label); | ||
134 | return NULL; | ||
135 | } | ||
136 | |||
137 | pwm->label = label; | ||
138 | pwm->pwm_id = pwm_id; | ||
139 | |||
140 | /* Configure PWM */ | ||
141 | val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC | | ||
142 | PWM_CTRL2_MODE_HW; | ||
143 | |||
144 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2); | ||
145 | |||
146 | if (ret < 0) { | ||
147 | pr_err("%s: Failed to configure PWM, Error %d\n", | ||
148 | pwm->label, ret); | ||
149 | |||
150 | kfree(pwm); | ||
151 | return NULL; | ||
152 | } | ||
153 | |||
154 | return pwm; | ||
155 | } | ||
156 | EXPORT_SYMBOL(pwm_request); | ||
157 | |||
158 | void pwm_free(struct pwm_device *pwm) | ||
159 | { | ||
160 | pwm_disable(pwm); | ||
161 | kfree(pwm); | ||
162 | } | ||
163 | EXPORT_SYMBOL(pwm_free); | ||
164 | |||
165 | MODULE_LICENSE("GPL"); | ||