OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / pcmcia / pxa2xx_palmtc.c
blob9e38de769ba3b30cbcd3d8f067783f1f314ab488
1 /*
2 * linux/drivers/pcmcia/pxa2xx_palmtc.c
4 * Driver for Palm Tungsten|C PCMCIA
6 * Copyright (C) 2008 Alex Osborne <ato@meshy.org>
7 * Copyright (C) 2009-2011 Marek Vasut <marek.vasut@gmail.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio.h>
18 #include <linux/delay.h>
20 #include <asm/mach-types.h>
21 #include <mach/palmtc.h>
22 #include "soc_common.h"
24 static struct gpio palmtc_pcmcia_gpios[] = {
25 { GPIO_NR_PALMTC_PCMCIA_POWER1, GPIOF_INIT_LOW, "PCMCIA Power 1" },
26 { GPIO_NR_PALMTC_PCMCIA_POWER2, GPIOF_INIT_LOW, "PCMCIA Power 2" },
27 { GPIO_NR_PALMTC_PCMCIA_POWER3, GPIOF_INIT_LOW, "PCMCIA Power 3" },
28 { GPIO_NR_PALMTC_PCMCIA_RESET, GPIOF_INIT_HIGH,"PCMCIA Reset" },
29 { GPIO_NR_PALMTC_PCMCIA_READY, GPIOF_IN, "PCMCIA Ready" },
30 { GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN, "PCMCIA Power Ready" },
33 static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
35 int ret;
37 ret = gpio_request_array(palmtc_pcmcia_gpios,
38 ARRAY_SIZE(palmtc_pcmcia_gpios));
40 skt->socket.pci_irq = gpio_to_irq(GPIO_NR_PALMTC_PCMCIA_READY);
42 return ret;
45 static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
47 gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
50 static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
51 struct pcmcia_state *state)
53 state->detect = 1; /* always inserted */
54 state->ready = !!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_READY);
55 state->bvd1 = 1;
56 state->bvd2 = 1;
57 state->wrprot = 0;
58 state->vs_3v = 1;
59 state->vs_Xv = 0;
62 static int palmtc_wifi_powerdown(void)
64 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
65 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
66 mdelay(40);
67 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
68 return 0;
71 static int palmtc_wifi_powerup(void)
73 int timeout = 50;
75 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
76 mdelay(50);
78 /* Power up the card, 1.8V first, after a while 3.3V */
79 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
80 mdelay(100);
81 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
83 /* Wait till the card is ready */
84 while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
85 timeout) {
86 mdelay(1);
87 timeout--;
90 /* Power down the WiFi in case of error */
91 if (!timeout) {
92 palmtc_wifi_powerdown();
93 return 1;
96 /* Reset the card */
97 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
98 mdelay(20);
99 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
100 mdelay(25);
102 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
104 return 0;
107 static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
108 const socket_state_t *state)
110 int ret = 1;
112 if (state->Vcc == 0)
113 ret = palmtc_wifi_powerdown();
114 else if (state->Vcc == 33)
115 ret = palmtc_wifi_powerup();
117 return ret;
120 static struct pcmcia_low_level palmtc_pcmcia_ops = {
121 .owner = THIS_MODULE,
123 .first = 0,
124 .nr = 1,
126 .hw_init = palmtc_pcmcia_hw_init,
127 .hw_shutdown = palmtc_pcmcia_hw_shutdown,
129 .socket_state = palmtc_pcmcia_socket_state,
130 .configure_socket = palmtc_pcmcia_configure_socket,
133 static struct platform_device *palmtc_pcmcia_device;
135 static int __init palmtc_pcmcia_init(void)
137 int ret;
139 if (!machine_is_palmtc())
140 return -ENODEV;
142 palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
143 if (!palmtc_pcmcia_device)
144 return -ENOMEM;
146 ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
147 sizeof(palmtc_pcmcia_ops));
149 if (!ret)
150 ret = platform_device_add(palmtc_pcmcia_device);
152 if (ret)
153 platform_device_put(palmtc_pcmcia_device);
155 return ret;
158 static void __exit palmtc_pcmcia_exit(void)
160 platform_device_unregister(palmtc_pcmcia_device);
163 module_init(palmtc_pcmcia_init);
164 module_exit(palmtc_pcmcia_exit);
166 MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
167 " Marek Vasut <marek.vasut@gmail.com>");
168 MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
169 MODULE_ALIAS("platform:pxa2xx-pcmcia");
170 MODULE_LICENSE("GPL");