1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  i2c Support for Atmel's AT91 Two-Wire Interface (TWI)
  4 *
  5 *  Copyright (C) 2011 Weinmann Medical GmbH
  6 *  Author: Nikolaus Voss <n.voss@weinmann.de>
  7 *
  8 *  Evolved from original work by:
  9 *  Copyright (C) 2004 Rick Bronson
 10 *  Converted to 2.6 by Andrew Victor <andrew@sanpeople.com>
 11 *
 12 *  Borrowed heavily from original work by:
 13 *  Copyright (C) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>
 14 */
 15
 16#include <linux/clk.h>
 17#include <linux/err.h>
 18#include <linux/i2c.h>
 19#include <linux/io.h>
 20#include <linux/module.h>
 21#include <linux/of.h>
 22#include <linux/of_device.h>
 23#include <linux/platform_device.h>
 24#include <linux/pm_runtime.h>
 25#include <linux/pinctrl/consumer.h>
 26
 27#include "i2c-at91.h"
 28
 29unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg)
 30{
 31	return readl_relaxed(dev->base + reg);
 32}
 33
 34void at91_twi_write(struct at91_twi_dev *dev, unsigned reg, unsigned val)
 35{
 36	writel_relaxed(val, dev->base + reg);
 37}
 38
 39void at91_disable_twi_interrupts(struct at91_twi_dev *dev)
 40{
 41	at91_twi_write(dev, AT91_TWI_IDR, AT91_TWI_INT_MASK);
 42}
 43
 44void at91_twi_irq_save(struct at91_twi_dev *dev)
 45{
 46	dev->imr = at91_twi_read(dev, AT91_TWI_IMR) & AT91_TWI_INT_MASK;
 47	at91_disable_twi_interrupts(dev);
 48}
 49
 50void at91_twi_irq_restore(struct at91_twi_dev *dev)
 51{
 52	at91_twi_write(dev, AT91_TWI_IER, dev->imr);
 53}
 54
 55void at91_init_twi_bus(struct at91_twi_dev *dev)
 56{
 57	at91_disable_twi_interrupts(dev);
 58	at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SWRST);
 59	if (dev->slave_detected)
 60		at91_init_twi_bus_slave(dev);
 61	else
 62		at91_init_twi_bus_master(dev);
 63}
 64
 65static struct at91_twi_pdata at91rm9200_config = {
 66	.clk_max_div = 5,
 67	.clk_offset = 3,
 68	.has_unre_flag = true,
 69};
 70
 71static struct at91_twi_pdata at91sam9261_config = {
 72	.clk_max_div = 5,
 73	.clk_offset = 4,
 74};
 75
 76static struct at91_twi_pdata at91sam9260_config = {
 77	.clk_max_div = 7,
 78	.clk_offset = 4,
 79};
 80
 81static struct at91_twi_pdata at91sam9g20_config = {
 82	.clk_max_div = 7,
 83	.clk_offset = 4,
 84};
 85
 86static struct at91_twi_pdata at91sam9g10_config = {
 87	.clk_max_div = 7,
 88	.clk_offset = 4,
 89};
 90
 91static const struct platform_device_id at91_twi_devtypes[] = {
 92	{
 93		.name = "i2c-at91rm9200",
 94		.driver_data = (unsigned long) &at91rm9200_config,
 95	}, {
 96		.name = "i2c-at91sam9261",
 97		.driver_data = (unsigned long) &at91sam9261_config,
 98	}, {
 99		.name = "i2c-at91sam9260",
100		.driver_data = (unsigned long) &at91sam9260_config,
101	}, {
102		.name = "i2c-at91sam9g20",
103		.driver_data = (unsigned long) &at91sam9g20_config,
104	}, {
105		.name = "i2c-at91sam9g10",
106		.driver_data = (unsigned long) &at91sam9g10_config,
107	}, {
108		/* sentinel */
109	}
110};
111
112#if defined(CONFIG_OF)
113static struct at91_twi_pdata at91sam9x5_config = {
114	.clk_max_div = 7,
115	.clk_offset = 4,
116};
117
118static struct at91_twi_pdata sama5d4_config = {
119	.clk_max_div = 7,
120	.clk_offset = 4,
121	.has_hold_field = true,
122	.has_dig_filtr = true,
123};
124
125static struct at91_twi_pdata sama5d2_config = {
126	.clk_max_div = 7,
127	.clk_offset = 3,
128	.has_unre_flag = true,
129	.has_alt_cmd = true,
130	.has_hold_field = true,
131	.has_dig_filtr = true,
132	.has_adv_dig_filtr = true,
133	.has_ana_filtr = true,
134	.has_clear_cmd = false,	/* due to errata, CLEAR cmd is not working */
135};
136
137static struct at91_twi_pdata sam9x60_config = {
138	.clk_max_div = 7,
139	.clk_offset = 3,
140	.has_unre_flag = true,
141	.has_alt_cmd = true,
142	.has_hold_field = true,
143	.has_dig_filtr = true,
144	.has_adv_dig_filtr = true,
145	.has_ana_filtr = true,
146	.has_clear_cmd = true,
147};
148
149static const struct of_device_id atmel_twi_dt_ids[] = {
150	{
151		.compatible = "atmel,at91rm9200-i2c",
152		.data = &at91rm9200_config,
153	}, {
154		.compatible = "atmel,at91sam9260-i2c",
155		.data = &at91sam9260_config,
156	}, {
157		.compatible = "atmel,at91sam9261-i2c",
158		.data = &at91sam9261_config,
159	}, {
160		.compatible = "atmel,at91sam9g20-i2c",
161		.data = &at91sam9g20_config,
162	}, {
163		.compatible = "atmel,at91sam9g10-i2c",
164		.data = &at91sam9g10_config,
165	}, {
166		.compatible = "atmel,at91sam9x5-i2c",
167		.data = &at91sam9x5_config,
168	}, {
169		.compatible = "atmel,sama5d4-i2c",
170		.data = &sama5d4_config,
171	}, {
172		.compatible = "atmel,sama5d2-i2c",
173		.data = &sama5d2_config,
174	}, {
175		.compatible = "microchip,sam9x60-i2c",
176		.data = &sam9x60_config,
177	}, {
178		/* sentinel */
179	}
180};
181MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
182#endif
183
184static struct at91_twi_pdata *at91_twi_get_driver_data(
185					struct platform_device *pdev)
186{
187	if (pdev->dev.of_node) {
188		const struct of_device_id *match;
189		match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);
190		if (!match)
191			return NULL;
192		return (struct at91_twi_pdata *)match->data;
193	}
194	return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;
195}
196
197static int at91_twi_probe(struct platform_device *pdev)
198{
199	struct at91_twi_dev *dev;
200	struct resource *mem;
201	int rc;
202	u32 phy_addr;
203
204	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
205	if (!dev)
206		return -ENOMEM;
207
208	dev->dev = &pdev->dev;
209
210	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
211	if (!mem)
212		return -ENODEV;
213	phy_addr = mem->start;
214
215	dev->pdata = at91_twi_get_driver_data(pdev);
216	if (!dev->pdata)
217		return -ENODEV;
218
219	dev->base = devm_ioremap_resource(&pdev->dev, mem);
220	if (IS_ERR(dev->base))
221		return PTR_ERR(dev->base);
222
223	dev->irq = platform_get_irq(pdev, 0);
224	if (dev->irq < 0)
225		return dev->irq;
226
227	platform_set_drvdata(pdev, dev);
228
229	dev->clk = devm_clk_get(dev->dev, NULL);
230	if (IS_ERR(dev->clk)) {
231		dev_err(dev->dev, "no clock defined\n");
232		return -ENODEV;
233	}
234	clk_prepare_enable(dev->clk);
235
236	snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");
237	i2c_set_adapdata(&dev->adapter, dev);
238	dev->adapter.owner = THIS_MODULE;
239	dev->adapter.class = I2C_CLASS_DEPRECATED;
240	dev->adapter.dev.parent = dev->dev;
241	dev->adapter.nr = pdev->id;
242	dev->adapter.timeout = AT91_I2C_TIMEOUT;
243	dev->adapter.dev.of_node = pdev->dev.of_node;
244
245	dev->slave_detected = i2c_detect_slave_mode(&pdev->dev);
246
247	if (dev->slave_detected)
248		rc = at91_twi_probe_slave(pdev, phy_addr, dev);
249	else
250		rc = at91_twi_probe_master(pdev, phy_addr, dev);
251	if (rc)
252		return rc;
253
254	at91_init_twi_bus(dev);
255
256	pm_runtime_set_autosuspend_delay(dev->dev, AUTOSUSPEND_TIMEOUT);
257	pm_runtime_use_autosuspend(dev->dev);
258	pm_runtime_set_active(dev->dev);
259	pm_runtime_enable(dev->dev);
260
261	rc = i2c_add_numbered_adapter(&dev->adapter);
262	if (rc) {
263		clk_disable_unprepare(dev->clk);
264
265		pm_runtime_disable(dev->dev);
266		pm_runtime_set_suspended(dev->dev);
267
268		return rc;
269	}
270
271	dev_info(dev->dev, "AT91 i2c bus driver (hw version: %#x).\n",
272		 at91_twi_read(dev, AT91_TWI_VER));
273	return 0;
274}
275
276static int at91_twi_remove(struct platform_device *pdev)
277{
278	struct at91_twi_dev *dev = platform_get_drvdata(pdev);
279
280	i2c_del_adapter(&dev->adapter);
281	clk_disable_unprepare(dev->clk);
282
283	pm_runtime_disable(dev->dev);
284	pm_runtime_set_suspended(dev->dev);
285
286	return 0;
287}
288
289static int __maybe_unused at91_twi_runtime_suspend(struct device *dev)
290{
291	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
292
293	clk_disable_unprepare(twi_dev->clk);
294
295	pinctrl_pm_select_sleep_state(dev);
296
297	return 0;
298}
299
300static int __maybe_unused at91_twi_runtime_resume(struct device *dev)
301{
302	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
303
304	pinctrl_pm_select_default_state(dev);
305
306	return clk_prepare_enable(twi_dev->clk);
307}
308
309static int __maybe_unused at91_twi_suspend_noirq(struct device *dev)
310{
311	if (!pm_runtime_status_suspended(dev))
312		at91_twi_runtime_suspend(dev);
313
314	return 0;
315}
316
317static int __maybe_unused at91_twi_resume_noirq(struct device *dev)
318{
319	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
320	int ret;
321
322	if (!pm_runtime_status_suspended(dev)) {
323		ret = at91_twi_runtime_resume(dev);
324		if (ret)
325			return ret;
326	}
327
328	pm_runtime_mark_last_busy(dev);
329	pm_request_autosuspend(dev);
330
331	at91_init_twi_bus(twi_dev);
332
333	return 0;
334}
335
336static const struct dev_pm_ops __maybe_unused at91_twi_pm = {
337	.suspend_noirq	= at91_twi_suspend_noirq,
338	.resume_noirq	= at91_twi_resume_noirq,
339	.runtime_suspend	= at91_twi_runtime_suspend,
340	.runtime_resume		= at91_twi_runtime_resume,
341};
342
343static struct platform_driver at91_twi_driver = {
344	.probe		= at91_twi_probe,
345	.remove		= at91_twi_remove,
346	.id_table	= at91_twi_devtypes,
347	.driver		= {
348		.name	= "at91_i2c",
349		.of_match_table = of_match_ptr(atmel_twi_dt_ids),
350		.pm	= pm_ptr(&at91_twi_pm),
351	},
352};
353
354static int __init at91_twi_init(void)
355{
356	return platform_driver_register(&at91_twi_driver);
357}
358
359static void __exit at91_twi_exit(void)
360{
361	platform_driver_unregister(&at91_twi_driver);
362}
363
364subsys_initcall(at91_twi_init);
365module_exit(at91_twi_exit);
366
367MODULE_AUTHOR("Nikolaus Voss <n.voss@weinmann.de>");
368MODULE_DESCRIPTION("I2C (TWI) driver for Atmel AT91");
369MODULE_LICENSE("GPL");
370MODULE_ALIAS("platform:at91_i2c");

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  i2c Support for Atmel's AT91 Two-Wire Interface (TWI)
  4 *
  5 *  Copyright (C) 2011 Weinmann Medical GmbH
  6 *  Author: Nikolaus Voss <n.voss@weinmann.de>
  7 *
  8 *  Evolved from original work by:
  9 *  Copyright (C) 2004 Rick Bronson
 10 *  Converted to 2.6 by Andrew Victor <andrew@sanpeople.com>
 11 *
 12 *  Borrowed heavily from original work by:
 13 *  Copyright (C) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>
 14 */
 15
 16#include <linux/clk.h>
 17#include <linux/err.h>
 18#include <linux/i2c.h>
 19#include <linux/io.h>
 20#include <linux/module.h>
 21#include <linux/of.h>
 
 22#include <linux/platform_device.h>
 23#include <linux/pm_runtime.h>
 24#include <linux/pinctrl/consumer.h>
 25
 26#include "i2c-at91.h"
 27
 28unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg)
 29{
 30	return readl_relaxed(dev->base + reg);
 31}
 32
 33void at91_twi_write(struct at91_twi_dev *dev, unsigned reg, unsigned val)
 34{
 35	writel_relaxed(val, dev->base + reg);
 36}
 37
 38void at91_disable_twi_interrupts(struct at91_twi_dev *dev)
 39{
 40	at91_twi_write(dev, AT91_TWI_IDR, AT91_TWI_INT_MASK);
 41}
 42
 43void at91_twi_irq_save(struct at91_twi_dev *dev)
 44{
 45	dev->imr = at91_twi_read(dev, AT91_TWI_IMR) & AT91_TWI_INT_MASK;
 46	at91_disable_twi_interrupts(dev);
 47}
 48
 49void at91_twi_irq_restore(struct at91_twi_dev *dev)
 50{
 51	at91_twi_write(dev, AT91_TWI_IER, dev->imr);
 52}
 53
 54void at91_init_twi_bus(struct at91_twi_dev *dev)
 55{
 56	at91_disable_twi_interrupts(dev);
 57	at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SWRST);
 58	if (dev->slave_detected)
 59		at91_init_twi_bus_slave(dev);
 60	else
 61		at91_init_twi_bus_master(dev);
 62}
 63
 64static struct at91_twi_pdata at91rm9200_config = {
 65	.clk_max_div = 5,
 66	.clk_offset = 3,
 67	.has_unre_flag = true,
 68};
 69
 70static struct at91_twi_pdata at91sam9261_config = {
 71	.clk_max_div = 5,
 72	.clk_offset = 4,
 73};
 74
 75static struct at91_twi_pdata at91sam9260_config = {
 76	.clk_max_div = 7,
 77	.clk_offset = 4,
 78};
 79
 80static struct at91_twi_pdata at91sam9g20_config = {
 81	.clk_max_div = 7,
 82	.clk_offset = 4,
 83};
 84
 85static struct at91_twi_pdata at91sam9g10_config = {
 86	.clk_max_div = 7,
 87	.clk_offset = 4,
 88};
 89
 90static const struct platform_device_id at91_twi_devtypes[] = {
 91	{
 92		.name = "i2c-at91rm9200",
 93		.driver_data = (unsigned long) &at91rm9200_config,
 94	}, {
 95		.name = "i2c-at91sam9261",
 96		.driver_data = (unsigned long) &at91sam9261_config,
 97	}, {
 98		.name = "i2c-at91sam9260",
 99		.driver_data = (unsigned long) &at91sam9260_config,
100	}, {
101		.name = "i2c-at91sam9g20",
102		.driver_data = (unsigned long) &at91sam9g20_config,
103	}, {
104		.name = "i2c-at91sam9g10",
105		.driver_data = (unsigned long) &at91sam9g10_config,
106	}, {
107		/* sentinel */
108	}
109};
110
111#if defined(CONFIG_OF)
112static struct at91_twi_pdata at91sam9x5_config = {
113	.clk_max_div = 7,
114	.clk_offset = 4,
115};
116
117static struct at91_twi_pdata sama5d4_config = {
118	.clk_max_div = 7,
119	.clk_offset = 4,
120	.has_hold_field = true,
121	.has_dig_filtr = true,
122};
123
124static struct at91_twi_pdata sama5d2_config = {
125	.clk_max_div = 7,
126	.clk_offset = 3,
127	.has_unre_flag = true,
128	.has_alt_cmd = true,
129	.has_hold_field = true,
130	.has_dig_filtr = true,
131	.has_adv_dig_filtr = true,
132	.has_ana_filtr = true,
133	.has_clear_cmd = false,	/* due to errata, CLEAR cmd is not working */
134};
135
136static struct at91_twi_pdata sam9x60_config = {
137	.clk_max_div = 7,
138	.clk_offset = 3,
139	.has_unre_flag = true,
140	.has_alt_cmd = true,
141	.has_hold_field = true,
142	.has_dig_filtr = true,
143	.has_adv_dig_filtr = true,
144	.has_ana_filtr = true,
145	.has_clear_cmd = true,
146};
147
148static const struct of_device_id atmel_twi_dt_ids[] = {
149	{
150		.compatible = "atmel,at91rm9200-i2c",
151		.data = &at91rm9200_config,
152	}, {
153		.compatible = "atmel,at91sam9260-i2c",
154		.data = &at91sam9260_config,
155	}, {
156		.compatible = "atmel,at91sam9261-i2c",
157		.data = &at91sam9261_config,
158	}, {
159		.compatible = "atmel,at91sam9g20-i2c",
160		.data = &at91sam9g20_config,
161	}, {
162		.compatible = "atmel,at91sam9g10-i2c",
163		.data = &at91sam9g10_config,
164	}, {
165		.compatible = "atmel,at91sam9x5-i2c",
166		.data = &at91sam9x5_config,
167	}, {
168		.compatible = "atmel,sama5d4-i2c",
169		.data = &sama5d4_config,
170	}, {
171		.compatible = "atmel,sama5d2-i2c",
172		.data = &sama5d2_config,
173	}, {
174		.compatible = "microchip,sam9x60-i2c",
175		.data = &sam9x60_config,
176	}, {
177		/* sentinel */
178	}
179};
180MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
181#endif
182
183static struct at91_twi_pdata *at91_twi_get_driver_data(
184					struct platform_device *pdev)
185{
186	if (pdev->dev.of_node) {
187		const struct of_device_id *match;
188		match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);
189		if (!match)
190			return NULL;
191		return (struct at91_twi_pdata *)match->data;
192	}
193	return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;
194}
195
196static int at91_twi_probe(struct platform_device *pdev)
197{
198	struct at91_twi_dev *dev;
199	struct resource *mem;
200	int rc;
201	u32 phy_addr;
202
203	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
204	if (!dev)
205		return -ENOMEM;
206
207	dev->dev = &pdev->dev;
208
209	dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
210	if (IS_ERR(dev->base))
211		return PTR_ERR(dev->base);
212	phy_addr = mem->start;
213
214	dev->pdata = at91_twi_get_driver_data(pdev);
215	if (!dev->pdata)
216		return -ENODEV;
217
 
 
 
 
218	dev->irq = platform_get_irq(pdev, 0);
219	if (dev->irq < 0)
220		return dev->irq;
221
222	platform_set_drvdata(pdev, dev);
223
224	dev->clk = devm_clk_get_enabled(dev->dev, NULL);
225	if (IS_ERR(dev->clk))
226		return dev_err_probe(dev->dev, PTR_ERR(dev->clk),
227				     "failed to enable clock\n");
 
 
228
229	snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");
230	i2c_set_adapdata(&dev->adapter, dev);
231	dev->adapter.owner = THIS_MODULE;
232	dev->adapter.class = I2C_CLASS_DEPRECATED;
233	dev->adapter.dev.parent = dev->dev;
234	dev->adapter.nr = pdev->id;
235	dev->adapter.timeout = AT91_I2C_TIMEOUT;
236	dev->adapter.dev.of_node = pdev->dev.of_node;
237
238	dev->slave_detected = i2c_detect_slave_mode(&pdev->dev);
239
240	if (dev->slave_detected)
241		rc = at91_twi_probe_slave(pdev, phy_addr, dev);
242	else
243		rc = at91_twi_probe_master(pdev, phy_addr, dev);
244	if (rc)
245		return rc;
246
247	at91_init_twi_bus(dev);
248
249	pm_runtime_set_autosuspend_delay(dev->dev, AUTOSUSPEND_TIMEOUT);
250	pm_runtime_use_autosuspend(dev->dev);
251	pm_runtime_set_active(dev->dev);
252	pm_runtime_enable(dev->dev);
253
254	rc = i2c_add_numbered_adapter(&dev->adapter);
255	if (rc) {
 
 
256		pm_runtime_disable(dev->dev);
257		pm_runtime_set_suspended(dev->dev);
258
259		return rc;
260	}
261
262	dev_info(dev->dev, "AT91 i2c bus driver (hw version: %#x).\n",
263		 at91_twi_read(dev, AT91_TWI_VER));
264	return 0;
265}
266
267static void at91_twi_remove(struct platform_device *pdev)
268{
269	struct at91_twi_dev *dev = platform_get_drvdata(pdev);
270
271	i2c_del_adapter(&dev->adapter);
 
272
273	pm_runtime_disable(dev->dev);
274	pm_runtime_set_suspended(dev->dev);
 
 
275}
276
277static int __maybe_unused at91_twi_runtime_suspend(struct device *dev)
278{
279	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
280
281	clk_disable_unprepare(twi_dev->clk);
282
283	pinctrl_pm_select_sleep_state(dev);
284
285	return 0;
286}
287
288static int __maybe_unused at91_twi_runtime_resume(struct device *dev)
289{
290	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
291
292	pinctrl_pm_select_default_state(dev);
293
294	return clk_prepare_enable(twi_dev->clk);
295}
296
297static int __maybe_unused at91_twi_suspend_noirq(struct device *dev)
298{
299	if (!pm_runtime_status_suspended(dev))
300		at91_twi_runtime_suspend(dev);
301
302	return 0;
303}
304
305static int __maybe_unused at91_twi_resume_noirq(struct device *dev)
306{
307	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
308	int ret;
309
310	if (!pm_runtime_status_suspended(dev)) {
311		ret = at91_twi_runtime_resume(dev);
312		if (ret)
313			return ret;
314	}
315
316	pm_runtime_mark_last_busy(dev);
317	pm_request_autosuspend(dev);
318
319	at91_init_twi_bus(twi_dev);
320
321	return 0;
322}
323
324static const struct dev_pm_ops __maybe_unused at91_twi_pm = {
325	.suspend_noirq	= at91_twi_suspend_noirq,
326	.resume_noirq	= at91_twi_resume_noirq,
327	.runtime_suspend	= at91_twi_runtime_suspend,
328	.runtime_resume		= at91_twi_runtime_resume,
329};
330
331static struct platform_driver at91_twi_driver = {
332	.probe		= at91_twi_probe,
333	.remove_new	= at91_twi_remove,
334	.id_table	= at91_twi_devtypes,
335	.driver		= {
336		.name	= "at91_i2c",
337		.of_match_table = of_match_ptr(atmel_twi_dt_ids),
338		.pm	= pm_ptr(&at91_twi_pm),
339	},
340};
341
342static int __init at91_twi_init(void)
343{
344	return platform_driver_register(&at91_twi_driver);
345}
346
347static void __exit at91_twi_exit(void)
348{
349	platform_driver_unregister(&at91_twi_driver);
350}
351
352subsys_initcall(at91_twi_init);
353module_exit(at91_twi_exit);
354
355MODULE_AUTHOR("Nikolaus Voss <n.voss@weinmann.de>");
356MODULE_DESCRIPTION("I2C (TWI) driver for Atmel AT91");
357MODULE_LICENSE("GPL");
358MODULE_ALIAS("platform:at91_i2c");