4 * Copyright (C) 2005, 2006 Nokia Corporation
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/module.h>
23 #include <linux/device.h>
24 #include <linux/delay.h>
25 #include <linux/gpio.h>
26 #include <linux/spi/spi.h>
27 #include <linux/spi/tsc2301.h>
29 u16 tsc2301_read_reg(struct tsc2301 *tsc, int reg)
31 struct spi_transfer t[2];
38 memset(t, 0, sizeof(t));
45 spi_message_add_tail(&t[0], &m);
50 spi_message_add_tail(&t[1], &m);
57 void tsc2301_write_reg(struct tsc2301 *tsc, int reg, u16 val)
59 struct spi_transfer t;
63 /* Now we prepare the command for transferring */
70 memset(&t, 0, sizeof(t));
74 spi_message_add_tail(&t, &m);
79 void tsc2301_write_kbc(struct tsc2301 *tsc, int val)
83 w = tsc->config2_shadow;
85 w |= (val & 0x03) << 14;
86 tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
87 tsc->config2_shadow = w;
90 void tsc2301_write_pll(struct tsc2301 *tsc,
91 int pll_n, int pll_a, int pll_pdc, int pct_e, int pll_o)
95 w = tsc->config2_shadow;
97 w |= (pll_n & 0x0f) | ((pll_a & 0x0f) << 4) | ((pll_pdc & 0x0f) << 8);
98 w |= pct_e ? (1 << 12) : 0;
99 w |= pll_o ? (1 << 13) : 0;
100 tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
101 tsc->config2_shadow = w;
104 void tsc2301_read_buf(struct tsc2301 *tsc, int reg, u16 *rx_buf, int len)
106 struct spi_transfer t[2];
107 struct spi_message m;
113 spi_message_init(&m);
116 memset(t, 0, sizeof(t));
120 spi_message_add_tail(&t[0], &m);
123 t[1].rx_buf = rx_buf;
125 spi_message_add_tail(&t[1], &m);
129 for (i = 0; i < len; i++)
130 printk(KERN_DEBUG "rx_buf[%d]: %04x\n", i, rx_buf[i]);
133 static int __devinit tsc2301_probe(struct spi_device *spi)
136 struct tsc2301_platform_data *pdata = spi->dev.platform_data;
141 dev_dbg(&spi->dev, "no platform data?\n");
145 tsc = kzalloc(sizeof(*tsc), GFP_KERNEL);
149 dev_set_drvdata(&spi->dev, tsc);
152 tsc->enable_clock = pdata->enable_clock;
153 tsc->disable_clock = pdata->disable_clock;
155 if (pdata->reset_gpio >= 0) {
156 tsc->reset_gpio = pdata->reset_gpio;
157 r = gpio_request(tsc->reset_gpio, "TSC2301 reset");
160 gpio_direction_output(tsc->reset_gpio, 1);
162 gpio_set_value(tsc->reset_gpio, 0);
164 tsc->reset_gpio = -1;
166 spi->mode = SPI_MODE_1;
167 spi->bits_per_word = 16;
168 /* The max speed might've been defined by the board-specific
170 if (!spi->max_speed_hz)
171 spi->max_speed_hz = TSC2301_HZ;
175 tsc2301_write_reg(tsc, TSC2301_REG_RESET, 0xbb00);
178 w = tsc2301_read_reg(tsc, TSC2301_REG_ADC);
179 if (!(w & (1 << 14))) {
180 dev_err(&spi->dev, "invalid ADC reg value: %04x\n", w);
185 w = tsc2301_read_reg(tsc, TSC2301_REG_DAC);
186 if (!(w & (1 << 15))) {
187 dev_err(&spi->dev, "invalid DAC reg value: %04x\n", w);
192 /* Stop keypad scanning */
193 tsc2301_write_reg(tsc, TSC2301_REG_KEY, 0x4000);
195 /* We have to cache this for read-modify-write, since we can't
197 w = tsc2301_read_reg(tsc, TSC2301_REG_CONFIG2);
198 /* By default BIT15 is set */
200 tsc->config2_shadow = w;
202 r = tsc2301_kp_init(tsc, pdata);
205 r = tsc2301_ts_init(tsc, pdata);
210 tsc2301_ts_exit(tsc);
212 tsc2301_kp_exit(tsc);
218 static int __devexit tsc2301_remove(struct spi_device *spi)
220 struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
222 tsc2301_ts_exit(tsc);
223 tsc2301_kp_exit(tsc);
224 if (tsc->reset_gpio >= 0)
225 gpio_free(tsc->reset_gpio);
232 static int tsc2301_suspend(struct spi_device *spi, pm_message_t mesg)
234 struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
237 if ((r = tsc2301_kp_suspend(tsc)) < 0)
239 if ((r = tsc2301_ts_suspend(tsc)) < 0) {
240 tsc2301_kp_resume(tsc);
247 static int tsc2301_resume(struct spi_device *spi)
249 struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
251 tsc2301_ts_resume(tsc);
252 tsc2301_kp_resume(tsc);
258 static struct spi_driver tsc2301_driver = {
261 .bus = &spi_bus_type,
262 .owner = THIS_MODULE,
265 .suspend = tsc2301_suspend,
266 .resume = tsc2301_resume,
268 .probe = tsc2301_probe,
269 .remove = __devexit_p(tsc2301_remove),
272 static int __init tsc2301_init(void)
274 printk("TSC2301 driver initializing\n");
276 return spi_register_driver(&tsc2301_driver);
278 module_init(tsc2301_init);
280 static void __exit tsc2301_exit(void)
282 spi_unregister_driver(&tsc2301_driver);
284 module_exit(tsc2301_exit);
286 MODULE_AUTHOR("Juha Yrjölä <juha.yrjola@nokia.com>");
287 MODULE_LICENSE("GPL");