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1da177e4 LT |
1 | /* |
2 | * i2c-pca-isa.c driver for PCA9564 on ISA boards | |
3 | * Copyright (C) 2004 Arcom Control Systems | |
c01b0831 | 4 | * Copyright (C) 2008 Pengutronix |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/kernel.h> |
22 | #include <linux/ioport.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/delay.h> | |
2378bc09 | 26 | #include <linux/jiffies.h> |
1da177e4 LT |
27 | #include <linux/init.h> |
28 | #include <linux/interrupt.h> | |
1da177e4 | 29 | #include <linux/wait.h> |
5cedb05d | 30 | #include <linux/isa.h> |
1da177e4 LT |
31 | #include <linux/i2c.h> |
32 | #include <linux/i2c-algo-pca.h> | |
21782180 | 33 | #include <linux/io.h> |
1da177e4 | 34 | |
1da177e4 LT |
35 | #include <asm/irq.h> |
36 | ||
c01b0831 | 37 | #define DRIVER "i2c-pca-isa" |
1da177e4 LT |
38 | #define IO_SIZE 4 |
39 | ||
ce564033 RH |
40 | static unsigned long base; |
41 | static int irq = -1; | |
1da177e4 LT |
42 | |
43 | /* Data sheet recommends 59kHz for 100kHz operation due to variation | |
44 | * in the actual clock rate */ | |
eff9ec95 | 45 | static int clock = 59000; |
1da177e4 | 46 | |
2378bc09 | 47 | static struct i2c_adapter pca_isa_ops; |
1da177e4 LT |
48 | static wait_queue_head_t pca_wait; |
49 | ||
c01b0831 | 50 | static void pca_isa_writebyte(void *pd, int reg, int val) |
1da177e4 LT |
51 | { |
52 | #ifdef DEBUG_IO | |
53 | static char *names[] = { "T/O", "DAT", "ADR", "CON" }; | |
154d22b0 FS |
54 | printk(KERN_DEBUG "*** write %s at %#lx <= %#04x\n", names[reg], |
55 | base+reg, val); | |
1da177e4 LT |
56 | #endif |
57 | outb(val, base+reg); | |
58 | } | |
59 | ||
c01b0831 | 60 | static int pca_isa_readbyte(void *pd, int reg) |
1da177e4 LT |
61 | { |
62 | int res = inb(base+reg); | |
63 | #ifdef DEBUG_IO | |
64 | { | |
3d438291 | 65 | static char *names[] = { "STA", "DAT", "ADR", "CON" }; |
154d22b0 | 66 | printk(KERN_DEBUG "*** read %s => %#04x\n", names[reg], res); |
1da177e4 LT |
67 | } |
68 | #endif | |
69 | return res; | |
70 | } | |
71 | ||
c01b0831 | 72 | static int pca_isa_waitforcompletion(void *pd) |
1da177e4 | 73 | { |
2378bc09 | 74 | unsigned long timeout; |
6abb930a | 75 | long ret; |
1da177e4 LT |
76 | |
77 | if (irq > -1) { | |
22f8b269 | 78 | ret = wait_event_timeout(pca_wait, |
2378bc09 WS |
79 | pca_isa_readbyte(pd, I2C_PCA_CON) |
80 | & I2C_PCA_CON_SI, pca_isa_ops.timeout); | |
1da177e4 | 81 | } else { |
2378bc09 WS |
82 | /* Do polling */ |
83 | timeout = jiffies + pca_isa_ops.timeout; | |
6abb930a YY |
84 | do { |
85 | ret = time_before(jiffies, timeout); | |
86 | if (pca_isa_readbyte(pd, I2C_PCA_CON) | |
87 | & I2C_PCA_CON_SI) | |
88 | break; | |
1da177e4 | 89 | udelay(100); |
6abb930a | 90 | } while (ret); |
1da177e4 | 91 | } |
6abb930a | 92 | |
2378bc09 | 93 | return ret > 0; |
1da177e4 LT |
94 | } |
95 | ||
c01b0831 WS |
96 | static void pca_isa_resetchip(void *pd) |
97 | { | |
98 | /* apparently only an external reset will do it. not a lot can be done */ | |
99 | printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n"); | |
100 | } | |
101 | ||
7d12e780 | 102 | static irqreturn_t pca_handler(int this_irq, void *dev_id) { |
22f8b269 | 103 | wake_up(&pca_wait); |
1da177e4 LT |
104 | return IRQ_HANDLED; |
105 | } | |
106 | ||
107 | static struct i2c_algo_pca_data pca_isa_data = { | |
c01b0831 | 108 | /* .data intentionally left NULL, not needed with ISA */ |
1da177e4 LT |
109 | .write_byte = pca_isa_writebyte, |
110 | .read_byte = pca_isa_readbyte, | |
c01b0831 WS |
111 | .wait_for_completion = pca_isa_waitforcompletion, |
112 | .reset_chip = pca_isa_resetchip, | |
1da177e4 LT |
113 | }; |
114 | ||
115 | static struct i2c_adapter pca_isa_ops = { | |
116 | .owner = THIS_MODULE, | |
1da177e4 | 117 | .algo_data = &pca_isa_data, |
eff9ec95 | 118 | .name = "PCA9564/PCA9665 ISA Adapter", |
8e99ada8 | 119 | .timeout = HZ, |
1da177e4 LT |
120 | }; |
121 | ||
ce564033 RH |
122 | static int __devinit pca_isa_match(struct device *dev, unsigned int id) |
123 | { | |
124 | int match = base != 0; | |
125 | ||
126 | if (match) { | |
127 | if (irq <= -1) | |
128 | dev_warn(dev, "Using polling mode (specify irq)\n"); | |
129 | } else | |
130 | dev_err(dev, "Please specify I/O base\n"); | |
131 | ||
132 | return match; | |
133 | } | |
134 | ||
5cedb05d | 135 | static int __devinit pca_isa_probe(struct device *dev, unsigned int id) |
1da177e4 | 136 | { |
1da177e4 LT |
137 | init_waitqueue_head(&pca_wait); |
138 | ||
5cedb05d | 139 | dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq); |
1da177e4 | 140 | |
68e1ee62 | 141 | #ifdef CONFIG_PPC |
104cb574 CK |
142 | if (check_legacy_ioport(base)) { |
143 | dev_err(dev, "I/O address %#08lx is not available\n", base); | |
144 | goto out; | |
145 | } | |
146 | #endif | |
147 | ||
1da177e4 | 148 | if (!request_region(base, IO_SIZE, "i2c-pca-isa")) { |
5cedb05d | 149 | dev_err(dev, "I/O address %#08lx is in use\n", base); |
1da177e4 LT |
150 | goto out; |
151 | } | |
152 | ||
153 | if (irq > -1) { | |
154 | if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) { | |
5cedb05d | 155 | dev_err(dev, "Request irq%d failed\n", irq); |
1da177e4 LT |
156 | goto out_region; |
157 | } | |
158 | } | |
159 | ||
c01b0831 | 160 | pca_isa_data.i2c_clock = clock; |
1da177e4 | 161 | if (i2c_pca_add_bus(&pca_isa_ops) < 0) { |
5cedb05d | 162 | dev_err(dev, "Failed to add i2c bus\n"); |
1da177e4 LT |
163 | goto out_irq; |
164 | } | |
165 | ||
166 | return 0; | |
167 | ||
168 | out_irq: | |
169 | if (irq > -1) | |
170 | free_irq(irq, &pca_isa_ops); | |
171 | out_region: | |
172 | release_region(base, IO_SIZE); | |
173 | out: | |
174 | return -ENODEV; | |
175 | } | |
176 | ||
5cedb05d | 177 | static int __devexit pca_isa_remove(struct device *dev, unsigned int id) |
1da177e4 | 178 | { |
3269711b | 179 | i2c_del_adapter(&pca_isa_ops); |
1da177e4 | 180 | |
ce564033 | 181 | if (irq > -1) { |
1da177e4 LT |
182 | disable_irq(irq); |
183 | free_irq(irq, &pca_isa_ops); | |
184 | } | |
185 | release_region(base, IO_SIZE); | |
5cedb05d JD |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static struct isa_driver pca_isa_driver = { | |
ce564033 | 191 | .match = pca_isa_match, |
5cedb05d JD |
192 | .probe = pca_isa_probe, |
193 | .remove = __devexit_p(pca_isa_remove), | |
194 | .driver = { | |
195 | .owner = THIS_MODULE, | |
c01b0831 | 196 | .name = DRIVER, |
5cedb05d JD |
197 | } |
198 | }; | |
199 | ||
200 | static int __init pca_isa_init(void) | |
201 | { | |
202 | return isa_register_driver(&pca_isa_driver, 1); | |
203 | } | |
204 | ||
205 | static void __exit pca_isa_exit(void) | |
206 | { | |
207 | isa_unregister_driver(&pca_isa_driver); | |
1da177e4 LT |
208 | } |
209 | ||
210 | MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); | |
eff9ec95 | 211 | MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver"); |
1da177e4 LT |
212 | MODULE_LICENSE("GPL"); |
213 | ||
214 | module_param(base, ulong, 0); | |
215 | MODULE_PARM_DESC(base, "I/O base address"); | |
216 | ||
217 | module_param(irq, int, 0); | |
218 | MODULE_PARM_DESC(irq, "IRQ"); | |
219 | module_param(clock, int, 0); | |
eff9ec95 MAC |
220 | MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t" |
221 | "For PCA9564: 330000,288000,217000,146000," | |
222 | "88000,59000,44000,36000\n" | |
223 | "\t\tFor PCA9665:\tStandard: 60300 - 100099\n" | |
224 | "\t\t\t\tFast: 100100 - 400099\n" | |
225 | "\t\t\t\tFast+: 400100 - 10000099\n" | |
226 | "\t\t\t\tTurbo: Up to 1265800"); | |
1da177e4 | 227 | |
1da177e4 LT |
228 | module_init(pca_isa_init); |
229 | module_exit(pca_isa_exit); |