Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 1 | /* linux/drivers/char/pc8736x_gpio.c |
| 2 | |
| 3 | National Semiconductor PC8736x GPIO driver. Allows a user space |
| 4 | process to play with the GPIO pins. |
| 5 | |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 6 | Copyright (c) 2005,2006 Jim Cromie <jim.cromie@gmail.com> |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 7 | |
| 8 | adapted from linux/drivers/char/scx200_gpio.c |
| 9 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>, |
| 10 | */ |
| 11 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 12 | #include <linux/fs.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 17 | #include <linux/cdev.h> |
Jim Cromie | ec31231 | 2006-06-27 02:54:25 -0700 | [diff] [blame] | 18 | #include <linux/io.h> |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 19 | #include <linux/ioport.h> |
Jim Cromie | 8bcf613 | 2006-06-27 02:54:25 -0700 | [diff] [blame] | 20 | #include <linux/mutex.h> |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 21 | #include <linux/nsc_gpio.h> |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 22 | #include <linux/platform_device.h> |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 23 | #include <asm/uaccess.h> |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 24 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 25 | #define DEVNAME "pc8736x_gpio" |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 26 | |
| 27 | MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>"); |
Jim Cromie | 4f197842 | 2006-07-10 04:45:35 -0700 | [diff] [blame] | 28 | MODULE_DESCRIPTION("NatSemi/Winbond PC-8736x GPIO Pin Driver"); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 29 | MODULE_LICENSE("GPL"); |
| 30 | |
| 31 | static int major; /* default to dynamic major */ |
| 32 | module_param(major, int, 0); |
| 33 | MODULE_PARM_DESC(major, "Major device number"); |
| 34 | |
Jim Cromie | 8bcf613 | 2006-06-27 02:54:25 -0700 | [diff] [blame] | 35 | static DEFINE_MUTEX(pc8736x_gpio_config_lock); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 36 | static unsigned pc8736x_gpio_base; |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 37 | static u8 pc8736x_gpio_shadow[4]; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 38 | |
| 39 | #define SIO_BASE1 0x2E /* 1st command-reg to check */ |
| 40 | #define SIO_BASE2 0x4E /* alt command-reg to check */ |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 41 | |
| 42 | #define SIO_SID 0x20 /* SuperI/O ID Register */ |
Andre Haupt | b64fd29 | 2008-10-18 20:28:33 -0700 | [diff] [blame] | 43 | #define SIO_SID_PC87365 0xe5 /* Expected value in ID Register for PC87365 */ |
| 44 | #define SIO_SID_PC87366 0xe9 /* Expected value in ID Register for PC87366 */ |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 45 | |
| 46 | #define SIO_CF1 0x21 /* chip config, bit0 is chip enable */ |
| 47 | |
Jim Cromie | 4f197842 | 2006-07-10 04:45:35 -0700 | [diff] [blame] | 48 | #define PC8736X_GPIO_RANGE 16 /* ioaddr range */ |
| 49 | #define PC8736X_GPIO_CT 32 /* minors matching 4 8 bit ports */ |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 50 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 51 | #define SIO_UNIT_SEL 0x7 /* unit select reg */ |
| 52 | #define SIO_UNIT_ACT 0x30 /* unit enable */ |
| 53 | #define SIO_GPIO_UNIT 0x7 /* unit number of GPIO */ |
| 54 | #define SIO_VLM_UNIT 0x0D |
| 55 | #define SIO_TMS_UNIT 0x0E |
| 56 | |
| 57 | /* config-space addrs to read/write each unit's runtime addr */ |
| 58 | #define SIO_BASE_HADDR 0x60 |
| 59 | #define SIO_BASE_LADDR 0x61 |
| 60 | |
| 61 | /* GPIO config-space pin-control addresses */ |
| 62 | #define SIO_GPIO_PIN_SELECT 0xF0 |
| 63 | #define SIO_GPIO_PIN_CONFIG 0xF1 |
| 64 | #define SIO_GPIO_PIN_EVENT 0xF2 |
| 65 | |
| 66 | static unsigned char superio_cmd = 0; |
| 67 | static unsigned char selected_device = 0xFF; /* bogus start val */ |
| 68 | |
| 69 | /* GPIO port runtime access, functionality */ |
| 70 | static int port_offset[] = { 0, 4, 8, 10 }; /* non-uniform offsets ! */ |
| 71 | /* static int event_capable[] = { 1, 1, 0, 0 }; ports 2,3 are hobbled */ |
| 72 | |
| 73 | #define PORT_OUT 0 |
| 74 | #define PORT_IN 1 |
| 75 | #define PORT_EVT_EN 2 |
| 76 | #define PORT_EVT_STST 3 |
| 77 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 78 | static struct platform_device *pdev; /* use in dev_*() */ |
| 79 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 80 | static inline void superio_outb(int addr, int val) |
| 81 | { |
| 82 | outb_p(addr, superio_cmd); |
| 83 | outb_p(val, superio_cmd + 1); |
| 84 | } |
| 85 | |
| 86 | static inline int superio_inb(int addr) |
| 87 | { |
| 88 | outb_p(addr, superio_cmd); |
| 89 | return inb_p(superio_cmd + 1); |
| 90 | } |
| 91 | |
| 92 | static int pc8736x_superio_present(void) |
| 93 | { |
Andre Haupt | b64fd29 | 2008-10-18 20:28:33 -0700 | [diff] [blame] | 94 | int id; |
| 95 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 96 | /* try the 2 possible values, read a hardware reg to verify */ |
| 97 | superio_cmd = SIO_BASE1; |
Andre Haupt | b64fd29 | 2008-10-18 20:28:33 -0700 | [diff] [blame] | 98 | id = superio_inb(SIO_SID); |
| 99 | if (id == SIO_SID_PC87365 || id == SIO_SID_PC87366) |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 100 | return superio_cmd; |
| 101 | |
| 102 | superio_cmd = SIO_BASE2; |
Andre Haupt | b64fd29 | 2008-10-18 20:28:33 -0700 | [diff] [blame] | 103 | id = superio_inb(SIO_SID); |
| 104 | if (id == SIO_SID_PC87365 || id == SIO_SID_PC87366) |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 105 | return superio_cmd; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static void device_select(unsigned devldn) |
| 111 | { |
| 112 | superio_outb(SIO_UNIT_SEL, devldn); |
| 113 | selected_device = devldn; |
| 114 | } |
| 115 | |
| 116 | static void select_pin(unsigned iminor) |
| 117 | { |
| 118 | /* select GPIO port/pin from device minor number */ |
| 119 | device_select(SIO_GPIO_UNIT); |
| 120 | superio_outb(SIO_GPIO_PIN_SELECT, |
| 121 | ((iminor << 1) & 0xF0) | (iminor & 0x7)); |
| 122 | } |
| 123 | |
| 124 | static inline u32 pc8736x_gpio_configure_fn(unsigned index, u32 mask, u32 bits, |
| 125 | u32 func_slct) |
| 126 | { |
| 127 | u32 config, new_config; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 128 | |
Jim Cromie | 8bcf613 | 2006-06-27 02:54:25 -0700 | [diff] [blame] | 129 | mutex_lock(&pc8736x_gpio_config_lock); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 130 | |
| 131 | device_select(SIO_GPIO_UNIT); |
| 132 | select_pin(index); |
| 133 | |
| 134 | /* read current config value */ |
| 135 | config = superio_inb(func_slct); |
| 136 | |
| 137 | /* set new config */ |
| 138 | new_config = (config & mask) | bits; |
| 139 | superio_outb(func_slct, new_config); |
| 140 | |
Jim Cromie | 8bcf613 | 2006-06-27 02:54:25 -0700 | [diff] [blame] | 141 | mutex_unlock(&pc8736x_gpio_config_lock); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 142 | |
| 143 | return config; |
| 144 | } |
| 145 | |
| 146 | static u32 pc8736x_gpio_configure(unsigned index, u32 mask, u32 bits) |
| 147 | { |
| 148 | return pc8736x_gpio_configure_fn(index, mask, bits, |
| 149 | SIO_GPIO_PIN_CONFIG); |
| 150 | } |
| 151 | |
| 152 | static int pc8736x_gpio_get(unsigned minor) |
| 153 | { |
| 154 | int port, bit, val; |
| 155 | |
| 156 | port = minor >> 3; |
| 157 | bit = minor & 7; |
| 158 | val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN); |
| 159 | val >>= bit; |
| 160 | val &= 1; |
| 161 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 162 | dev_dbg(&pdev->dev, "_gpio_get(%d from %x bit %d) == val %d\n", |
| 163 | minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit, |
| 164 | val); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 165 | |
| 166 | return val; |
| 167 | } |
| 168 | |
| 169 | static void pc8736x_gpio_set(unsigned minor, int val) |
| 170 | { |
| 171 | int port, bit, curval; |
| 172 | |
| 173 | minor &= 0x1f; |
| 174 | port = minor >> 3; |
| 175 | bit = minor & 7; |
| 176 | curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT); |
| 177 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 178 | dev_dbg(&pdev->dev, "addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n", |
| 179 | pc8736x_gpio_base + port_offset[port] + PORT_OUT, |
| 180 | curval, bit, (curval & ~(1 << bit)), val, (val << bit)); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 181 | |
| 182 | val = (curval & ~(1 << bit)) | (val << bit); |
| 183 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 184 | dev_dbg(&pdev->dev, "gpio_set(minor:%d port:%d bit:%d)" |
| 185 | " %2x -> %2x\n", minor, port, bit, curval, val); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 186 | |
| 187 | outb_p(val, pc8736x_gpio_base + port_offset[port] + PORT_OUT); |
| 188 | |
| 189 | curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT); |
| 190 | val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN); |
| 191 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 192 | dev_dbg(&pdev->dev, "wrote %x, read: %x\n", curval, val); |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 193 | pc8736x_gpio_shadow[port] = val; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 196 | static int pc8736x_gpio_current(unsigned minor) |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 197 | { |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 198 | int port, bit; |
| 199 | minor &= 0x1f; |
| 200 | port = minor >> 3; |
| 201 | bit = minor & 7; |
| 202 | return ((pc8736x_gpio_shadow[port] >> bit) & 0x01); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void pc8736x_gpio_change(unsigned index) |
| 206 | { |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 207 | pc8736x_gpio_set(index, !pc8736x_gpio_current(index)); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 208 | } |
| 209 | |
Jim Cromie | 2e8f7a3 | 2006-07-14 00:24:26 -0700 | [diff] [blame] | 210 | static struct nsc_gpio_ops pc8736x_gpio_ops = { |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 211 | .owner = THIS_MODULE, |
| 212 | .gpio_config = pc8736x_gpio_configure, |
| 213 | .gpio_dump = nsc_gpio_dump, |
| 214 | .gpio_get = pc8736x_gpio_get, |
| 215 | .gpio_set = pc8736x_gpio_set, |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 216 | .gpio_change = pc8736x_gpio_change, |
| 217 | .gpio_current = pc8736x_gpio_current |
| 218 | }; |
| 219 | |
| 220 | static int pc8736x_gpio_open(struct inode *inode, struct file *file) |
| 221 | { |
| 222 | unsigned m = iminor(inode); |
Jim Cromie | 2e8f7a3 | 2006-07-14 00:24:26 -0700 | [diff] [blame] | 223 | file->private_data = &pc8736x_gpio_ops; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 224 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 225 | dev_dbg(&pdev->dev, "open %d\n", m); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 226 | |
Jim Cromie | 4f197842 | 2006-07-10 04:45:35 -0700 | [diff] [blame] | 227 | if (m >= PC8736X_GPIO_CT) |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 228 | return -EINVAL; |
| 229 | return nonseekable_open(inode, file); |
| 230 | } |
| 231 | |
Jim Cromie | 2e8f7a3 | 2006-07-14 00:24:26 -0700 | [diff] [blame] | 232 | static const struct file_operations pc8736x_gpio_fileops = { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 233 | .owner = THIS_MODULE, |
| 234 | .open = pc8736x_gpio_open, |
| 235 | .write = nsc_gpio_write, |
| 236 | .read = nsc_gpio_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 237 | .llseek = no_llseek, |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
Jim Cromie | 6cad56f | 2006-06-27 02:54:24 -0700 | [diff] [blame] | 240 | static void __init pc8736x_init_shadow(void) |
| 241 | { |
| 242 | int port; |
| 243 | |
| 244 | /* read the current values driven on the GPIO signals */ |
| 245 | for (port = 0; port < 4; ++port) |
| 246 | pc8736x_gpio_shadow[port] |
| 247 | = inb_p(pc8736x_gpio_base + port_offset[port] |
| 248 | + PORT_OUT); |
| 249 | |
| 250 | } |
| 251 | |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 252 | static struct cdev pc8736x_gpio_cdev; |
| 253 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 254 | static int __init pc8736x_gpio_init(void) |
| 255 | { |
Jim Cromie | babcfad | 2006-07-10 04:45:37 -0700 | [diff] [blame] | 256 | int rc; |
| 257 | dev_t devid; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 258 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 259 | pdev = platform_device_alloc(DEVNAME, 0); |
| 260 | if (!pdev) |
| 261 | return -ENOMEM; |
| 262 | |
| 263 | rc = platform_device_add(pdev); |
| 264 | if (rc) { |
| 265 | rc = -ENODEV; |
| 266 | goto undo_platform_dev_alloc; |
| 267 | } |
| 268 | dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n"); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 269 | |
| 270 | if (!pc8736x_superio_present()) { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 271 | rc = -ENODEV; |
| 272 | dev_err(&pdev->dev, "no device found\n"); |
| 273 | goto undo_platform_dev_add; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 274 | } |
Jim Cromie | 2e8f7a3 | 2006-07-14 00:24:26 -0700 | [diff] [blame] | 275 | pc8736x_gpio_ops.dev = &pdev->dev; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 276 | |
| 277 | /* Verify that chip and it's GPIO unit are both enabled. |
| 278 | My BIOS does this, so I take minimum action here |
| 279 | */ |
| 280 | rc = superio_inb(SIO_CF1); |
| 281 | if (!(rc & 0x01)) { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 282 | rc = -ENODEV; |
| 283 | dev_err(&pdev->dev, "device not enabled\n"); |
| 284 | goto undo_platform_dev_add; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 285 | } |
| 286 | device_select(SIO_GPIO_UNIT); |
| 287 | if (!superio_inb(SIO_UNIT_ACT)) { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 288 | rc = -ENODEV; |
| 289 | dev_err(&pdev->dev, "GPIO unit not enabled\n"); |
| 290 | goto undo_platform_dev_add; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 293 | /* read the GPIO unit base addr that chip responds to */ |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 294 | pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8 |
| 295 | | superio_inb(SIO_BASE_LADDR)); |
| 296 | |
Jim Cromie | 4f197842 | 2006-07-10 04:45:35 -0700 | [diff] [blame] | 297 | if (!request_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE, DEVNAME)) { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 298 | rc = -ENODEV; |
| 299 | dev_err(&pdev->dev, "GPIO ioport %x busy\n", |
| 300 | pc8736x_gpio_base); |
| 301 | goto undo_platform_dev_add; |
| 302 | } |
| 303 | dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 304 | |
Jim Cromie | babcfad | 2006-07-10 04:45:37 -0700 | [diff] [blame] | 305 | if (major) { |
| 306 | devid = MKDEV(major, 0); |
| 307 | rc = register_chrdev_region(devid, PC8736X_GPIO_CT, DEVNAME); |
| 308 | } else { |
| 309 | rc = alloc_chrdev_region(&devid, 0, PC8736X_GPIO_CT, DEVNAME); |
| 310 | major = MAJOR(devid); |
| 311 | } |
| 312 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 313 | if (rc < 0) { |
| 314 | dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc); |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 315 | goto undo_request_region; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 316 | } |
| 317 | if (!major) { |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 318 | major = rc; |
| 319 | dev_dbg(&pdev->dev, "got dynamic major %d\n", major); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | pc8736x_init_shadow(); |
Jim Cromie | babcfad | 2006-07-10 04:45:37 -0700 | [diff] [blame] | 323 | |
| 324 | /* ignore minor errs, and succeed */ |
Jim Cromie | 2e8f7a3 | 2006-07-14 00:24:26 -0700 | [diff] [blame] | 325 | cdev_init(&pc8736x_gpio_cdev, &pc8736x_gpio_fileops); |
Jim Cromie | babcfad | 2006-07-10 04:45:37 -0700 | [diff] [blame] | 326 | cdev_add(&pc8736x_gpio_cdev, devid, PC8736X_GPIO_CT); |
| 327 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 328 | return 0; |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 329 | |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 330 | undo_request_region: |
| 331 | release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE); |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 332 | undo_platform_dev_add: |
Ingo Molnar | 1017f6a | 2006-06-30 01:55:29 -0700 | [diff] [blame] | 333 | platform_device_del(pdev); |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 334 | undo_platform_dev_alloc: |
Ingo Molnar | 1017f6a | 2006-06-30 01:55:29 -0700 | [diff] [blame] | 335 | platform_device_put(pdev); |
| 336 | |
Jim Cromie | 58b087c | 2006-06-27 02:54:22 -0700 | [diff] [blame] | 337 | return rc; |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static void __exit pc8736x_gpio_cleanup(void) |
| 341 | { |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 342 | dev_dbg(&pdev->dev, "cleanup\n"); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 343 | |
Jim Cromie | 2738508 | 2006-07-10 04:45:36 -0700 | [diff] [blame] | 344 | cdev_del(&pc8736x_gpio_cdev); |
| 345 | unregister_chrdev_region(MKDEV(major,0), PC8736X_GPIO_CT); |
| 346 | release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 347 | |
Wei Yongjun | 1b3c165 | 2012-10-23 13:24:09 +0800 | [diff] [blame] | 348 | platform_device_unregister(pdev); |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Jim Cromie | 681a3e7 | 2006-06-27 02:54:21 -0700 | [diff] [blame] | 351 | module_init(pc8736x_gpio_init); |
| 352 | module_exit(pc8736x_gpio_cleanup); |