diff options
Diffstat (limited to 'drivers/i2c/chips/mcu_mpc8349emitx.c')
-rw-r--r-- | drivers/i2c/chips/mcu_mpc8349emitx.c | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/drivers/i2c/chips/mcu_mpc8349emitx.c b/drivers/i2c/chips/mcu_mpc8349emitx.c deleted file mode 100644 index 82a9bcb858b6..000000000000 --- a/drivers/i2c/chips/mcu_mpc8349emitx.c +++ /dev/null | |||
@@ -1,209 +0,0 @@ | |||
1 | /* | ||
2 | * Power Management and GPIO expander driver for MPC8349E-mITX-compatible MCU | ||
3 | * | ||
4 | * Copyright (c) 2008 MontaVista Software, Inc. | ||
5 | * | ||
6 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; either version 2 of the License, or | ||
11 | * (at your option) any later version. | ||
12 | */ | ||
13 | |||
14 | #include <linux/init.h> | ||
15 | #include <linux/kernel.h> | ||
16 | #include <linux/module.h> | ||
17 | #include <linux/device.h> | ||
18 | #include <linux/mutex.h> | ||
19 | #include <linux/i2c.h> | ||
20 | #include <linux/gpio.h> | ||
21 | #include <linux/of.h> | ||
22 | #include <linux/of_gpio.h> | ||
23 | #include <asm/prom.h> | ||
24 | #include <asm/machdep.h> | ||
25 | |||
26 | /* | ||
27 | * I don't have specifications for the MCU firmware, I found this register | ||
28 | * and bits positions by the trial&error method. | ||
29 | */ | ||
30 | #define MCU_REG_CTRL 0x20 | ||
31 | #define MCU_CTRL_POFF 0x40 | ||
32 | |||
33 | #define MCU_NUM_GPIO 2 | ||
34 | |||
35 | struct mcu { | ||
36 | struct mutex lock; | ||
37 | struct device_node *np; | ||
38 | struct i2c_client *client; | ||
39 | struct of_gpio_chip of_gc; | ||
40 | u8 reg_ctrl; | ||
41 | }; | ||
42 | |||
43 | static struct mcu *glob_mcu; | ||
44 | |||
45 | static void mcu_power_off(void) | ||
46 | { | ||
47 | struct mcu *mcu = glob_mcu; | ||
48 | |||
49 | pr_info("Sending power-off request to the MCU...\n"); | ||
50 | mutex_lock(&mcu->lock); | ||
51 | i2c_smbus_write_byte_data(glob_mcu->client, MCU_REG_CTRL, | ||
52 | mcu->reg_ctrl | MCU_CTRL_POFF); | ||
53 | mutex_unlock(&mcu->lock); | ||
54 | } | ||
55 | |||
56 | static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | ||
57 | { | ||
58 | struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); | ||
59 | struct mcu *mcu = container_of(of_gc, struct mcu, of_gc); | ||
60 | u8 bit = 1 << (4 + gpio); | ||
61 | |||
62 | mutex_lock(&mcu->lock); | ||
63 | if (val) | ||
64 | mcu->reg_ctrl &= ~bit; | ||
65 | else | ||
66 | mcu->reg_ctrl |= bit; | ||
67 | |||
68 | i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl); | ||
69 | mutex_unlock(&mcu->lock); | ||
70 | } | ||
71 | |||
72 | static int mcu_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | ||
73 | { | ||
74 | mcu_gpio_set(gc, gpio, val); | ||
75 | return 0; | ||
76 | } | ||
77 | |||
78 | static int mcu_gpiochip_add(struct mcu *mcu) | ||
79 | { | ||
80 | struct device_node *np; | ||
81 | struct of_gpio_chip *of_gc = &mcu->of_gc; | ||
82 | struct gpio_chip *gc = &of_gc->gc; | ||
83 | int ret; | ||
84 | |||
85 | np = of_find_compatible_node(NULL, NULL, "fsl,mcu-mpc8349emitx"); | ||
86 | if (!np) | ||
87 | return -ENODEV; | ||
88 | |||
89 | gc->owner = THIS_MODULE; | ||
90 | gc->label = np->full_name; | ||
91 | gc->can_sleep = 1; | ||
92 | gc->ngpio = MCU_NUM_GPIO; | ||
93 | gc->base = -1; | ||
94 | gc->set = mcu_gpio_set; | ||
95 | gc->direction_output = mcu_gpio_dir_out; | ||
96 | of_gc->gpio_cells = 2; | ||
97 | of_gc->xlate = of_gpio_simple_xlate; | ||
98 | |||
99 | np->data = of_gc; | ||
100 | mcu->np = np; | ||
101 | |||
102 | /* | ||
103 | * We don't want to lose the node, its ->data and ->full_name... | ||
104 | * So, if succeeded, we don't put the node here. | ||
105 | */ | ||
106 | ret = gpiochip_add(gc); | ||
107 | if (ret) | ||
108 | of_node_put(np); | ||
109 | return ret; | ||
110 | } | ||
111 | |||
112 | static int mcu_gpiochip_remove(struct mcu *mcu) | ||
113 | { | ||
114 | int ret; | ||
115 | |||
116 | ret = gpiochip_remove(&mcu->of_gc.gc); | ||
117 | if (ret) | ||
118 | return ret; | ||
119 | of_node_put(mcu->np); | ||
120 | |||
121 | return 0; | ||
122 | } | ||
123 | |||
124 | static int __devinit mcu_probe(struct i2c_client *client, | ||
125 | const struct i2c_device_id *id) | ||
126 | { | ||
127 | struct mcu *mcu; | ||
128 | int ret; | ||
129 | |||
130 | mcu = kzalloc(sizeof(*mcu), GFP_KERNEL); | ||
131 | if (!mcu) | ||
132 | return -ENOMEM; | ||
133 | |||
134 | mutex_init(&mcu->lock); | ||
135 | mcu->client = client; | ||
136 | i2c_set_clientdata(client, mcu); | ||
137 | |||
138 | ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL); | ||
139 | if (ret < 0) | ||
140 | goto err; | ||
141 | mcu->reg_ctrl = ret; | ||
142 | |||
143 | ret = mcu_gpiochip_add(mcu); | ||
144 | if (ret) | ||
145 | goto err; | ||
146 | |||
147 | /* XXX: this is potentially racy, but there is no lock for ppc_md */ | ||
148 | if (!ppc_md.power_off) { | ||
149 | glob_mcu = mcu; | ||
150 | ppc_md.power_off = mcu_power_off; | ||
151 | dev_info(&client->dev, "will provide power-off service\n"); | ||
152 | } | ||
153 | |||
154 | return 0; | ||
155 | err: | ||
156 | kfree(mcu); | ||
157 | return ret; | ||
158 | } | ||
159 | |||
160 | static int __devexit mcu_remove(struct i2c_client *client) | ||
161 | { | ||
162 | struct mcu *mcu = i2c_get_clientdata(client); | ||
163 | int ret; | ||
164 | |||
165 | if (glob_mcu == mcu) { | ||
166 | ppc_md.power_off = NULL; | ||
167 | glob_mcu = NULL; | ||
168 | } | ||
169 | |||
170 | ret = mcu_gpiochip_remove(mcu); | ||
171 | if (ret) | ||
172 | return ret; | ||
173 | i2c_set_clientdata(client, NULL); | ||
174 | kfree(mcu); | ||
175 | return 0; | ||
176 | } | ||
177 | |||
178 | static const struct i2c_device_id mcu_ids[] = { | ||
179 | { "mcu-mpc8349emitx", }, | ||
180 | {}, | ||
181 | }; | ||
182 | MODULE_DEVICE_TABLE(i2c, mcu_ids); | ||
183 | |||
184 | static struct i2c_driver mcu_driver = { | ||
185 | .driver = { | ||
186 | .name = "mcu-mpc8349emitx", | ||
187 | .owner = THIS_MODULE, | ||
188 | }, | ||
189 | .probe = mcu_probe, | ||
190 | .remove = __devexit_p(mcu_remove), | ||
191 | .id_table = mcu_ids, | ||
192 | }; | ||
193 | |||
194 | static int __init mcu_init(void) | ||
195 | { | ||
196 | return i2c_add_driver(&mcu_driver); | ||
197 | } | ||
198 | module_init(mcu_init); | ||
199 | |||
200 | static void __exit mcu_exit(void) | ||
201 | { | ||
202 | i2c_del_driver(&mcu_driver); | ||
203 | } | ||
204 | module_exit(mcu_exit); | ||
205 | |||
206 | MODULE_DESCRIPTION("Power Management and GPIO expander driver for " | ||
207 | "MPC8349E-mITX-compatible MCU"); | ||
208 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | ||
209 | MODULE_LICENSE("GPL"); | ||